chamilo-lms2/main/admin/calendar.lib.php

<?php // $id: $
/* For licensing terms, see /license.txt */
/**
 * @package chamilo.admin
 * @author Carlos Vargas
 * @todo check if this lib is still in used
 *    This file is the calendar/agenda.inc.php
 *
 * @todo This file should not exist since it redeclares many of the functions in calendar/agenda.inc.php thanks cvargas!!! : jmontoya
 */

/*
	Constants and variables
*/
// the variables for the days and the months
// Defining the shorts for the days
$DaysShort = api_get_week_days_short();
// Defining the days of the week to allow translation of the days
$DaysLong = api_get_week_days_long();
// Defining the months of the year to allow translation of the months
$MonthsLong = api_get_months_long();

/*
		FUNCTIONS
*/

/**
 * Retrieves all the agenda items from the table
 * @author Patrick Cool <patrick.cool@UGent.be>, Ghent University
 * @author Yannick Warnier <yannick.warnier@dokeos.com> - cleanup
 * @param integer $month: the integer value of the month we are viewing
 * @param integer $year: the 4-digit year indication e.g. 2005
 * @return array
 */

/**
 * show the mini calender of the given month
 * @author Patrick Cool <patrick.cool@UGent.be>, Ghent University
 * @param array an array containing all the agenda items for the given month
 * @param integer $month: the integer value of the month we are viewing
 * @param integer $year: the 4-digit year indication e.g. 2005
 * @param string $monthName: the language variable for the mont name
 * @return html code
 * @todo refactor this so that $monthName is no longer needed as a parameter
 */
function display_minimonthcalendar($agendaitems, $month, $year, $monthName)
{
    global $DaysShort;
    //Handle leap year
    $numberofdays = array(0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
    if (($year % 400 == 0) or ($year % 4 == 0 and $year % 100 <> 0)) {
        $numberofdays[2] = 29;
    }
    //Get the first day of the month
    $dayone = getdate(mktime(0, 0, 0, $month, 1, $year));
    //Start the week on monday
    $startdayofweek = $dayone['wday'] <> 0 ? ($dayone['wday'] - 1) : 6;
    $backwardsURL = api_get_self()."?".api_get_cidreq(
    )."&amp;coursePath=".(empty($_GET['coursePath']) ? '' : $_GET['coursePath'])."&amp;courseCode=".(empty($_GET['courseCode']) ? '' : $_GET['courseCode'])."&amp;month=".($month == 1 ? 12 : $month - 1)."&amp;year=".($month == 1 ? $year - 1 : $year);
    $forewardsURL = api_get_self()."?".api_get_cidreq(
    )."&amp;coursePath=".(empty($_GET['coursePath']) ? '' : $_GET['coursePath'])."&amp;courseCode=".(empty($_GET['courseCode']) ? '' : $_GET['courseCode'])."&amp;month=".($month == 12 ? 1 : $month + 1)."&amp;year=".($month == 12 ? $year + 1 : $year);

    echo     "<table class=\"data_table\">",
    "<tr>",
    "<th width=\"10%\"><a href=\"", $backwardsURL, "\"> ".Display::return_icon(
        'action_prev.png',
        get_lang('Previous')
    )." </a></th>",
    "<th width=\"80%\" colspan=\"5\">", $monthName, " ", $year, "</th>",
    "<th  width=\"10%\"><a href=\"", $forewardsURL, "\"> ".Display::return_icon(
        'action_next.png',
        get_lang('Next')
    )."</a></th>", "</tr>";
    echo "<tr>";
    for ($ii = 1; $ii < 8; $ii++) {
        echo "<td class=\"weekdays\">", $DaysShort[$ii % 7], "</td>";
    }
    echo "</tr>";
    $curday = -1;
    $today = getdate();
    while ($curday <= $numberofdays[$month]) {
        echo "<tr>";
        for ($ii = 0; $ii < 7; $ii++) {
            if (($curday == -1) && ($ii == $startdayofweek)) {
                $curday = 1;
            }
            if (($curday > 0) && ($curday <= $numberofdays[$month])) {
                $bgcolor = $ii < 5 ? $class = "class=\"days_week\"" : $class = "class=\"days_weekend\"";
                $dayheader = "$curday";
                if (($curday == $today['mday']) && ($year == $today['year']) && ($month == $today['mon'])) {
                    $dayheader = "$curday";
                    $class = "class=\"days_today\"";
                }
                echo "<td ".$class.">";
                if (!empty($agendaitems[$curday])) {
                    echo "<a href=\"".api_get_self()."?".api_get_cidreq(
                    )."&amp;action=view&amp;view=day&amp;day=".$curday."&amp;month=".$month."&amp;year=".$year."\">".$dayheader."</a>";
                } else {
                    echo $dayheader;
                }
                // "a".$dayheader." <span class=\"agendaitem\">".$agendaitems[$curday]."</span>";
                echo "</td>";
                $curday++;
            } else {
                echo "<td>&nbsp;</td>";
            }
        }
        echo "</tr>";
    }
    echo "</table>";
}

/**
 * show the calender of the given month
 * @author Patrick Cool <patrick.cool@UGent.be>, Ghent University
 * @param integer $month: the integer value of the month we are viewing
 * @param integer $year: the 4-digit year indication e.g. 2005
 * @return html code
 */
/**
 * returns all the javascript that is required for easily selecting the target people/groups this goes into the $htmlHeadXtra[] array
 * @author Patrick Cool <patrick.cool@UGent.be>, Ghent University
 * @return javascript code
 */
function to_javascript()
{
    $Send2All = get_lang("Send2All");

    return "<script type=\"text/javascript\" language=\"JavaScript\">
<!-- Begin javascript menu swapper

function move(fbox,	tbox)
{
	var	arrFbox	= new Array();
	var	arrTbox	= new Array();
	var	arrLookup =	new	Array();

	var	i;
	for	(i = 0;	i <	tbox.options.length; i++)
	{
		arrLookup[tbox.options[i].text]	= tbox.options[i].value;
		arrTbox[i] = tbox.options[i].text;
	}

	var	fLength	= 0;
	var	tLength	= arrTbox.length;

	for(i =	0; i < fbox.options.length;	i++)
	{
		arrLookup[fbox.options[i].text]	= fbox.options[i].value;

		if (fbox.options[i].selected &&	fbox.options[i].value != \"\")
		{
			arrTbox[tLength] = fbox.options[i].text;
			tLength++;
		}
		else
		{
			arrFbox[fLength] = fbox.options[i].text;
			fLength++;
		}
	}

	arrFbox.sort();
	arrTbox.sort();
	fbox.length	= 0;
	tbox.length	= 0;

	var	c;
	for(c =	0; c < arrFbox.length; c++)
	{
		var	no = new Option();
		no.value = arrLookup[arrFbox[c]];
		no.text	= arrFbox[c];
		fbox[c]	= no;
	}
	for(c =	0; c < arrTbox.length; c++)
	{
		var	no = new Option();
		no.value = arrLookup[arrTbox[c]];
		no.text	= arrTbox[c];
		tbox[c]	= no;
	}
}

function checkDate(month, day, year)
{
  var monthLength =
    new Array(31,28,31,30,31,30,31,31,30,31,30,31);

  if (!day || !month || !year)
    return false;

  // check for bisestile year
  if (year/4 == parseInt(year/4))
    monthLength[1] = 29;

  if (month < 1 || month > 12)
    return false;

  if (day > monthLength[month-1])
    return false;

  return true;
}

function mktime()
{
    var no, ma = 0, mb = 0, i = 0, d = new Date(), argv = arguments, argc = argv.length;
    d.setHours(0,0,0); d.setDate(1); d.setMonth(1); d.setYear(1972);
    var dateManip = {
        0: function(tt){ return d.setHours(tt); },
        1: function(tt){ return d.setMinutes(tt); },
        2: function(tt){ set = d.setSeconds(tt); mb = d.getDate() - 1; return set; },
        3: function(tt){ set = d.setMonth(parseInt(tt)-1); ma = d.getFullYear() - 1972; return set; },
        4: function(tt){ return d.setDate(tt+mb); },
        5: function(tt){ return d.setYear(tt+ma); }
    };
    for( i = 0; i < argc; i++ ){
        no = parseInt(argv[i]*1);
        if (isNaN(no)) {
            return false;
        } else {
            // arg is number, lets manipulate date object
            if(!dateManip[i](no)){
                // failed
                return false;
            }
        }
    }
    return Math.floor(d.getTime()/1000);
}

function validate()
{
	var	f =	document.new_calendar_item;
	f.submit();
	return true;
}

function validate_date()
{
		var start_day = document.new_calendar_item.fday.value;
		var start_month = document.new_calendar_item.fmonth.value;
		var start_year = document.new_calendar_item.fyear.value;
		var start_hour = document.new_calendar_item.fhour.value;
		var start_minute = document.new_calendar_item.fminute.value;
		var start_date = mktime(start_hour,start_minute,0,start_month,start_day,start_year)

		var ends_day = document.new_calendar_item.end_fday.value;
		var ends_month = document.new_calendar_item.end_fmonth.value;
		var ends_year = document.new_calendar_item.end_fyear.value;
		var ends_hour = document.new_calendar_item.end_fhour.value;
		var ends_minute = document.new_calendar_item.end_fminute.value;
		var ends_date = mktime(ends_hour,ends_minute,0,ends_month,ends_day,ends_year)

		msg_err1 = document.getElementById(\"err_date\");
		msg_err2 = document.getElementById(\"err_start_date\");
		msg_err3 = document.getElementById(\"err_end_date\");
		msg_err4 = document.getElementById(\"err_title\");

		if (start_date > ends_date) {
			msg_err1.style.display =\"block\";
			msg_err1.innerHTML=\"".get_lang('EndDateCannotBeBeforeTheStartDate')."\";
			msg_err2.innerHTML=\"\";msg_err3.innerHTML=\"\";
		} else if (!checkDate(start_month,start_day,start_year)) {
			msg_err2.style.display =\"block\";
			msg_err2.innerHTML=\"".get_lang('InvalidDate')."\";
			msg_err1.innerHTML=\"\";msg_err3.innerHTML=\"\";
		} else if (!checkDate(ends_month,ends_day,ends_year)) {
			msg_err3.style.display =\"block\";
			msg_err3.innerHTML=\"".get_lang('InvalidDate')."\";
			msg_err1.innerHTML=\"\";msg_err2.innerHTML=\"\";
		} else if (document.new_calendar_item.title.value == '') {
			msg_err4.style.display =\"block\";
			msg_err4.innerHTML=\"".get_lang('FieldRequired')."\";
			msg_err1.innerHTML=\"\";msg_err2.innerHTML=\"\";msg_err3.innerHTML=\"\";
		}  else {
			document.new_calendar_item.submit();
		}

}
//	End	-->
</script>";
}


/**
 * returns the javascript for setting a filter. This is a jump menu
 * @author Patrick Cool <patrick.cool@UGent.be>, Ghent University
 * @return javascript code
 */
function user_group_filter_javascript()
{
    return "<script language=\"JavaScript\" type=\"text/JavaScript\">
	<!--
	function MM_jumpMenu(targ,selObj,restore){
	  eval(targ+\".location='\"+selObj.options[selObj.selectedIndex].value+\"'\");
	  if (restore) selObj.selectedIndex=0;
	}
	//-->
	</script>
	";
}

function display_monthcalendar($month, $year)
{
    global $MonthsLong;
    global $DaysShort;
    global $origin;

    // grabbing all the calendar items for this year and storing it in a array
    $data = get_calendar_items($month, $year);


    //Handle leap year
    $numberofdays = array(0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
    if (($year % 400 == 0) or ($year % 4 == 0 and $year % 100 <> 0)) {
        $numberofdays[2] = 29;
    }

    //Get the first day of the month
    $dayone = getdate(mktime(0, 0, 0, $month, 1, $year));
    //Start the week on monday
    $startdayofweek = $dayone['wday'] <> 0 ? ($dayone['wday'] - 1) : 6;

    $backwardsURL = api_get_self()."?".api_get_cidreq(
    )."&amp;origin=$origin&amp;month=".($month == 1 ? 12 : $month - 1)."&amp;year=".($month == 1 ? $year - 1 : $year);
    $forewardsURL = api_get_self()."?".api_get_cidreq(
    )."&amp;origin=$origin&amp;month=".($month == 12 ? 1 : $month + 1)."&amp;year=".($month == 12 ? $year + 1 : $year);

    $maand_array_maandnummer = $month - 1;

    echo "<table class=\"data_table\">",
    "<tr>",
    "<th width=\"10%\"><a href=\"", $backwardsURL, "\"> ".Display::return_icon(
        'action_prev.png',
        get_lang('Previous')
    )."</a></th>",
    "<th width=\"80%\" colspan=\"5\">", $MonthsLong[$maand_array_maandnummer], " ", $year, "</th>",
    "<th width=\"10%\"><a href=\"", $forewardsURL, "\"> ".Display::return_icon(
        'action_next.png',
        get_lang('Next')
    )."</a></th>",
    "</tr>";

    echo "<tr>";

    for ($ii = 1; $ii < 8; $ii++) {
        echo "<td class=\"weekdays\" width=\"14%\">", $DaysShort[$ii % 7], "</td>";
    }

    echo "</tr>";
    $curday = -1;
    $today = getdate();
    while ($curday <= $numberofdays[$month]) {
        echo "<tr>";
        for ($ii = 0; $ii < 7; $ii++) {
            if (($curday == -1) && ($ii == $startdayofweek)) {
                $curday = 1;
            }
            if (($curday > 0) && ($curday <= $numberofdays[$month])) {
                $bgcolor = $ii < 5 ? "class=\"row_odd\"" : "class=\"row_even\"";

                $dayheader = "$curday";
                if (key_exists($curday, $data)) {
                    $dayheader = "<a href='".api_get_self()."?".api_get_cidreq(
                    )."&amp;view=list&amp;origin=$origin&amp;month=$month&amp;year=$year&amp;day=$curday#$curday'>".$curday."</a>";
                    foreach ($data[$curday] as $key => $agenda_item) {
                        foreach ($agenda_item as $key => $value) {
                            $start_time = api_convert_and_format_date($value['start_date'], TIME_NO_SEC_FORMAT);
                            $end_time = api_convert_and_format_date($value['end_date'], TIME_NO_SEC_FORMAT);
                            $dayheader .= '<br /><b>'.$start_time.' - '.$end_time.'</b>';
                            $dayheader .= ' - ';
                            $dayheader .= $value['title'];
                        }
                    }
                }
                if (($curday == $today['mday']) && ($year == $today['year']) && ($month == $today['mon'])) {
                    echo "<td id=\"today\" ", $bgcolor, "\">".$dayheader." ";
                } else {
                    echo "<td id=\"days\" ", $bgcolor, "\">".$dayheader." ";
                }
                echo "</td>";

                $curday++;
            } else {
                echo "<td>&nbsp;</td>";
            }
        }
        echo "</tr>";
    }
    echo "</table>";
}

/**
 * this function shows the form with the user that were not selected
 * @author Patrick Cool <patrick.cool@UGent.be>, Ghent University
 * @return html code
 */
/**
 * This function stores the Agenda Item in the table calendar_event and updates the item_property table also
 * @author Patrick Cool <patrick.cool@UGent.be>, Ghent University
 * @return integer the id of the last added agenda item
 */
function store_new_agenda_item()
{

    $TABLEAGENDA = Database::get_main_table(TABLE_MAIN_SYSTEM_CALENDAR);
    //$t_agenda_repeat = Database::get_course_Table(TABLE_AGENDA_REPEAT);

    // some filtering of the input data
    $title = strip_tags(trim($_POST['title'])); // no html allowed in the title
    $content = trim($_POST['content']);
    $start_date = (int)$_POST['fyear']."-".(int)$_POST['fmonth']."-".(int)$_POST['fday']." ".(int)$_POST['fhour'].":".(int)$_POST['fminute'].":00";
    $end_date = (int)$_POST['end_fyear']."-".(int)$_POST['end_fmonth']."-".(int)$_POST['end_fday']." ".(int)$_POST['end_fhour'].":".(int)$_POST['end_fminute'].":00";

    // store in the table calendar_event
    $sql = "INSERT INTO ".$TABLEAGENDA." (title,content, start_date, end_date)
            VALUES ('".$title."','".$content."', '".$start_date."','".$end_date."')";

    $result = Database::query($sql) or die (Database::error());
    $last_id = Database::insert_id();

    // store in last_tooledit (first the groups, then the users
    $to = $_POST['selectedform'];

    /*	if ((!is_null($to))or (!empty($_SESSION['toolgroup']))) // !is_null($to): when no user is selected we send it to everyone
	{
		$send_to=separate_users_groups($to);
		// storing the selected groups
		if (is_array($send_to['groups']))
		{
			foreach ($send_to['groups'] as $group)
			{
				api_item_property_update($_course, TOOL_CALENDAR_EVENT, $last_id,"AgendaAdded", $_user['user_id'], $group,'',$start_date, $end_date);
			}
		}
		// storing the selected users
		if (is_array($send_to['users']))
		{
			foreach ($send_to['users'] as $user)
			{
				api_item_property_update($_course, TOOL_CALENDAR_EVENT, $last_id,"AgendaAdded", $_user['user_id'],'',$user, $start_date,$end_date);
			}
		}
	}
	else // the message is sent to everyone, so we set the group to 0
	{
		api_item_property_update($_course, TOOL_CALENDAR_EVENT, $last_id,"AgendaAdded", $_user['user_id'], '','',$start_date,$end_date);
	}*/

// storing the resources
    //store_resources($_SESSION['source_type'],$last_id);

    //if repetitive, insert element into agenda_repeat table
    /*    if(!empty($_POST['repeat']) && !empty($_POST['repeat_type']))
    {
    	if(!empty($_POST['repeat_end_year']) && !empty($_POST['repeat_end_month']) && !empty($_POST['repeat_end_day']))
        {
        	$end_y = intval($_POST['repeat_end_year']);
            $end_m = intval($_POST['repeat_end_month']);
            $end_d = intval($_POST['repeat_end_day']);
            $end = mktime((int)$_POST['fhour'],(int)$_POST['fminute'],0,$end_m,$end_d,$end_y);
            $now = time();
            $type = Database::escape_string($_POST['repeat_type']);

        	if($end > $now
                && in_array($type,array('daily','weekly','monthlyByDate','monthlyByDay','monthlyByDayR','yearly')))
            {
        	   $sql = "INSERT INTO $t_agenda_repeat (cal_id, cal_type, cal_end)" .
                    " VALUES ($last_id,'$type',$end)";
               $res = Database::query($sql);
            }
        }
    }
	return $last_id;*/

    return $last_id;
}

function display_student_links()
{
    if ($_SESSION['view'] <> 'month') {
        echo '<a href="'.api_get_self().'?action=view&amp;view=month">'.
            Display::return_icon('month_empty.png', get_lang('MonthView'), '', ICON_SIZE_MEDIUM).'</a>';
        if ($_SESSION['sort'] == 'DESC') {
            echo '<a href="'.api_get_self().'?sort=asc&amp;origin='.Security::remove_XSS(
                $_GET['origin']
            ).'">'.Display::return_icon(
                'calendar_normal.png',
                get_lang('AgendaSortChronologicallyUp'),
                '',
                ICON_SIZE_MEDIUM
            ).'</a>';
        } else {
            //echo '<a href="'.api_get_self().'?sort=desc&amp;origin='.Security::remove_XSS($_GET['origin']).'"> '.Display::return_icon('calendar_inverse.png',get_lang('AgendaSortChronologicallyDown'),'',ICON_SIZE_MEDIUM).'</a>';
        }
    } else {
        echo '<a href="'.api_get_self().'?action=view&amp;view=list">'.Display::return_icon(
            'week.png',
            get_lang('ListView'),
            '',
            ICON_SIZE_MEDIUM
        ).'</a>';

    }
}

/**
 * get all the information of the agenda_item from the database
 * @author Patrick Cool <patrick.cool@UGent.be>, Ghent University
 * @param integer the id of the agenda item we are getting all the information of
 * @return an associative array that contains all the information of the agenda item. The keys are the database fields
 */
function get_agenda_item($id)
{
    $TABLEAGENDA = Database::get_main_table(TABLE_MAIN_SYSTEM_CALENDAR);
    //$t_agenda_repeat = Database::get_course_table(TABLE_AGENDA_REPEAT);
    $item = array();
    if (empty($id)) {
        $id = intval($_GET['id']);
    } else {
        $id = intval($id);
    }
    if (empty($id)) {
        return $item;
    }
    $sql = "SELECT * FROM ".$TABLEAGENDA." WHERE id='".$id."'";
    $result = Database::query($sql);
    $entry_to_edit = Database::fetch_array($result);
    $item['title'] = $entry_to_edit["title"];
    $item['content'] = $entry_to_edit["content"];
    $item['start_date'] = $entry_to_edit["start_date"];
    $item['end_date'] = $entry_to_edit["end_date"];
    $item['to'] == "everyone";
    // if the item has been sent to everybody then we show the compact to form
    if ($item['to'] == "everyone") {
        $_SESSION['allow_individual_calendar'] = "hide";
    } else {
        $_SESSION['allow_individual_calendar'] = "show";
    }

    return $item;
}

/**
 * This is the function that updates an agenda item. It does 3 things
 * 1. storethe start_date, end_date, title and message in the calendar_event table
 * 2. store the groups/users who this message is meant for in the item_property table
 * 3. modify the attachments (if needed)
 * @author Patrick Cool <patrick.cool@UGent.be>, Ghent University
 */
function store_edited_agenda_item()
{

    // STEP 1: editing the calendar_event table
    // 1.a.  some filtering of the input data
    $id = (int)$_POST['id'];
    $title = strip_tags(trim($_POST['title'])); // no html allowed in the title
    $content = trim($_POST['content']);
    $start_date = (int)$_POST['fyear']."-".(int)$_POST['fmonth']."-".(int)$_POST['fday']." ".(int)$_POST['fhour'].":".(int)$_POST['fminute'].":00";
    $end_date = (int)$_POST['end_fyear']."-".(int)$_POST['end_fmonth']."-".(int)$_POST['end_fday']." ".(int)$_POST['end_fhour'].":".(int)$_POST['end_fminute'].":00";
    $to = $_POST['selectedform'];
    // 1.b. the actual saving in calendar_event table
    $edit_result = save_edit_agenda_item($id, $title, $content, $start_date, $end_date);

    echo '<br />';
    Display::display_normal_message(get_lang("EditSuccess"));

}

/**
 * This function stores the Agenda Item in the table calendar_event and updates the item_property table also (after an edit)
 * @author Patrick Cool <patrick.cool@UGent.be>, Ghent University
 */
function save_edit_agenda_item($id, $title, $content, $start_date, $end_date)
{
    $TABLEAGENDA = Database::get_main_table(TABLE_MAIN_SYSTEM_CALENDAR);

    $id = Database::escape_string($id);
    $title = Database::escape_string($title);
    $content = Database::escape_string($content);

    $start_date = api_get_utc_datetime($start_date);
    $start_date = Database::escape_string($start_date);

    $end_date = api_get_utc_datetime($end_date);
    $end_date = Database::escape_string($end_date);


    // store the modifications in the table calendar_event
    $sql = "UPDATE ".$TABLEAGENDA."
			SET title='".$title."',
				content='".$content."',
				start_date='".$start_date."',
				end_date='".$end_date."'
			WHERE id='".$id."'";
    $result = Database::query($sql) or die (Database::error());

    return true;
}

/**
 * This is the function that deletes an agenda item.
 * The agenda item is no longer fycically deleted but the visibility in the item_property table is set to 2
 * which means that it is invisible for the student AND course admin. Only the platform administrator can see it.
 * This will in a later stage allow the platform administrator to recover resources that were mistakenly deleted
 * by the course administrator
 * @author Patrick Cool <patrick.cool@UGent.be>, Ghent University
 * @param integer the id of the agenda item wa are deleting
 * @return bool true if it's success or false otherwise
 */
function delete_agenda_item($id)
{
    $_course = api_get_course_info();
    $t_agenda = Database::get_main_table(TABLE_MAIN_SYSTEM_CALENDAR);
    $id = intval($id);
    $sql = "SELECT * FROM $t_agenda WHERE id = '$id'";
    $res = Database::query($sql);
    if (Database::num_rows($res) > 0) {
        $sql = "DELETE FROM ".$t_agenda." WHERE id='$id'";
        $result = Database::query($sql) or die (Database::error());
        api_item_property_update($_course, TOOL_CALENDAR_EVENT, $id, 'delete', api_get_user_id());

        return true;
    }

    return false;
}

/**
 * Makes an agenda item visible or invisible for a student
 * @author Patrick Cool <patrick.cool@UGent.be>, Ghent University
 * @param integer id the id of the agenda item we are changing the visibility of
 */
function showhide_agenda_item($id)
{
    global $nameTools;
    /*==================================================
				SHOW / HIDE A CALENDAR ITEM
	  ==================================================*/
    //  and $_GET['isStudentView']<>"false" is added to prevent that the visibility is changed after you do the following:
    // change visibility -> studentview -> course manager view
    if ((api_is_allowed_to_edit() && !api_is_anonymous()) and $_GET['isStudentView'] <> "false") {
        if (isset($_GET['id']) && $_GET['id'] && isset($_GET['action']) && $_GET['action'] == "showhide") {
            $id = (int)addslashes($_GET['id']);
            change_visibility($nameTools, $id);
            Display::display_normal_message(get_lang("VisibilityChanged"));
        }
    }
}

/**
 * Displays all the agenda items
 * @author Patrick Cool <patrick.cool@UGent.be>, Ghent University
 * @author Yannick Warnier <yannick.warnier@dokeos.com> - cleanup
 */
function display_agenda_items()
{
    global $select_month, $select_year;
    global $DaysShort, $DaysLong, $MonthsLong;
    global $dateFormatLong, $timeNoSecFormat, $charset, $_user, $_course;

    $TABLEAGENDA = Database::get_main_table(TABLE_MAIN_SYSTEM_CALENDAR);

    // getting the group memberships
    //$group_memberships=GroupManager::get_group_ids($_course['dbName'],$_user['user_id']);

    // getting the name of the groups
    //$group_names=get_course_groups();

    /*--------------------------------------------------
			CONSTRUCT THE SQL STATEMENT
	  --------------------------------------------------*/

    $start = 0;
    $stop = 0;
    // this is to make a difference between showing everything (all months) or only the current month)
    // $show_all_current is a part of the sql statement
    if ($_SESSION['show_all_admin'] !== "showall") {
        $show_all_current = " AND MONTH(start_date)=$select_month AND year(start_date)=$select_year";
        $start = mktime(0, 0, 0, $select_month, 1, $select_year);
        $stop = 0;
        if (empty($select_year)) {
            $select_year = date('Y');
        }
        if (empty($select_month)) {
            $select_month = date('m');
        }
        if ($select_month == 12) {
            $stop = mktime(0, 0, 0, 1, 1, $select_year + 1) - 1;
        } else {
            $stop = mktime(0, 0, 0, $select_month + 1, 1, $select_year) - 1;
        }
    } else {
        $show_all_current = "";
        $start = time();
        $stop = mktime(0, 0, 0, 1, 1, 2038); //by default, set year to maximum for mktime()
    }

    // by default we use the id of the current user. The course administrator can see the agenda of other users by using the user / group filter

    $repeats = array(); //placeholder for repeated events

    if (api_is_allowed_to_edit() && !api_is_anonymous()) {
        $sql = "SELECT * FROM ".$TABLEAGENDA;

        global $_configuration;
        $current_access_url_id = 1;
        if ($_configuration['multiple_access_urls']) {
            $current_access_url_id = api_get_current_access_url_id();
        }
        $sql .= " WHERE access_url_id = $current_access_url_id";
        $sql .= ' ORDER BY start_date '.$_SESSION['sort'];
        //echo "<pre>".$sql."</pre>";
        $result = Database::query($sql) or die(Database::error());
        $number_items = Database::num_rows($result);
    } else {
        $number_items = 0;
    }


    /*--------------------------------------------------
			DISPLAY: NO ITEMS
	  --------------------------------------------------*/
    if ($number_items == 0) {
        echo "<table class=\"data_table\" ><tr><td>".get_lang("NoAgendaItems")."</td></tr></table>";
    }

    /*--------------------------------------------------
			DISPLAY: THE ITEMS
	  --------------------------------------------------*/

    $month_bar = "";
    $event_list = "";
    $counter = 0;
    $export_icon = 'export.png';
    $export_icon_low = 'export_low_fade.png';
    $export_icon_high = 'export_high_fade.png';

    while ($myrow = Database::fetch_array($result)) {
        $is_repeated = !empty($myrow['parent_event_id']);
        echo '<table class="data_table">';

        $myrow["start_date"] = api_get_local_time($myrow["start_date"]);

        if ($month_bar != api_format_date($myrow["start_date"], "%m%Y")) {
            $month_bar = api_format_date($myrow["start_date"], "%m%Y");
            echo "<tr><td class=\"agenda_month_divider\" colspan=\"3\" valign=\"top\">".
                api_format_date($myrow["start_date"], "%B %Y").
                "</td></tr>";
        }

        /*--------------------------------------------------
         display: the icon, title, destinees of the item
         -------------------------------------------------*/
        echo '<tr>';

        // highlight: if a date in the small calendar is clicked we highlight the relevant items

        $db_date = (int)api_format_date($myrow["start_date"], "%d").intval(
            api_format_date($myrow["start_date"], "%m")
        ).api_format_date($myrow["start_date"], "%Y");
        if ($_GET["day"].$_GET["month"].$_GET["year"] <> $db_date) {
            if ($myrow['visibility'] == '0') {
                $style = "data_hidden";
                $stylenotbold = "datanotbold_hidden";
                $text_style = "text_hidden";
            } else {
                $style = "data";
                $stylenotbold = "datanotbold";
                $text_style = "text";
            }
        } else {
            $style = "datanow";
            $stylenotbold = "datanotboldnow";
            $text_style = "textnow";
        }

        echo "<th>";
        // adding an internal anchor
        echo "<a name=\"".(int)date("d", strtotime($myrow["start_date"]))."\"></a>";
        // the icons. If the message is sent to one or more specific users/groups
        // we add the groups icon
        // 2do: if it is sent to groups we display the group icon, if it is sent to a user we show the user icon
        Display::display_icon('platform_event.png', get_lang('GlobalEvent'), '', ICON_SIZE_SMALL);
        /*if ($myrow['to_group_id']!=='0') {
    		echo Display::return_icon('group.gif', get_lang('AllUsersOfThePlatform'));
    	}*/
        echo " ".$myrow['title']."";
        echo "</th>";

        // the message has been sent to
        echo "<th>".get_lang("SentTo").": ".get_lang('AllUsersOfThePlatform');
        //$sent_to=sent_to(TOOL_CALENDAR_EVENT, $myrow["ref"]);
        //$sent_to_form=sent_to_form($sent_to);
        //	echo $sent_to_form;
        echo "</th>";

        if (!$is_repeated && (api_is_allowed_to_edit(false, true) OR (api_get_course_setting(
            'allow_user_edit_agenda'
        ) && !api_is_anonymous()))
        ) {
            if (!(api_is_course_coach() && !api_is_element_in_the_session(
                TOOL_AGENDA,
                $myrow['id']
            ))
            ) { // a coach can only delete an element belonging to his session
                echo '<th>'.get_lang('Actions');
                echo '</th></tr>';
            }
        }

        // display: the title
        echo "<tr class='row_odd'>";
        echo "<td>".get_lang("StartTimeWindow").": ";
        echo api_format_date($myrow["start_date"], DATE_TIME_FORMAT_LONG);
        echo "</td>";
        echo "<td>";
        if ($myrow["end_date"] <> "0000-00-00 00:00:00") {
            $myrow["end_date"] = api_get_local_time($myrow["end_date"]);
            echo get_lang("EndTimeWindow").": ";
            echo api_format_date($myrow["end_date"], DATE_TIME_FORMAT_LONG);
        }
        echo "</td>";

        if (!$is_repeated && (api_is_allowed_to_edit(false, true) OR (api_get_course_setting(
            'allow_user_edit_agenda'
        ) && !api_is_anonymous()))
        ) {
            if (!(api_is_course_coach() && !api_is_element_in_the_session(
                TOOL_AGENDA,
                $myrow['id']
            ))
            ) { // a coach can only delete an element belonging to his session
                $mylink = api_get_self().'?'.api_get_cidreq().'&amp;origin='.Security::remove_XSS(
                    $_GET['origin']
                ).'&amp;id='.$myrow['id'];
                echo '<td align="center">';
                // edit
                echo '<a href="'.$mylink.'&amp;action=edit&amp;title="'.get_lang("ModifyCalendarItem").'">';
                echo Display::return_icon('edit.gif', get_lang('ModifyCalendarItem'))."</a>";

                echo "<a href=\"".$mylink."&amp;action=delete\" onclick=\"javascript:if(!confirm('".addslashes(
                    api_htmlentities(get_lang("ConfirmYourChoice"), ENT_QUOTES, $charset)
                )."')) return false;\"  title=\"".get_lang("Delete")."\"> ";
                echo Display::return_icon('delete.gif', get_lang('Delete'))."</a>";
            }

            if (!$is_repeated && (api_is_allowed_to_edit(false, true) OR (api_get_course_setting(
                'allow_user_edit_agenda'
            ) && !api_is_anonymous()))
            ) {
                if (!(api_is_course_coach() && !api_is_element_in_the_session(TOOL_AGENDA, $myrow['id']))) {
                    // a coach can only delete an element belonging to his session
                    $td_colspan = '<td colspan="3">';
                } else {
                    $td_colspan = '<td colspan="2">';
                }
            } else {
                $td_colspan = '<td colspan="2">';
            }
            $mylink = 'calendar_ical_export.php?'.api_get_cidreq().'&amp;type=course&amp;id='.$myrow['id'];
            echo '<a class="ical_export" href="'.$mylink.'&amp;class=confidential" title="'.get_lang(
                'ExportiCalConfidential'
            ).'">'.Display::return_icon($export_icon_high, get_lang('ExportiCalConfidential')).'</a> ';
            echo '<a class="ical_export" href="'.$mylink.'&amp;class=private" title="'.get_lang(
                'ExportiCalPrivate'
            ).'">'.Display::return_icon($export_icon_low, get_lang('ExportiCalPrivate')).'</a> ';
            echo '<a class="ical_export" href="'.$mylink.'&amp;class=public" title="'.get_lang(
                'ExportiCalPublic'
            ).'">'.Display::return_icon($export_icon, get_lang('ExportiCalPublic')).'</a> ';
            echo '<a href="#" onclick="javascript:win_print=window.open(\'calendar_view_print.php?id='.$myrow['id'].'\',\'popup\',\'left=100,top=100,width=700,height=500,scrollbars=1,resizable=0\'); win_print.focus(); return false;">'.Display::return_icon(
                'print.gif',
                get_lang('Print')
            ).'</a>&nbsp;';
            echo '</td>';
            echo '</tr>';
        }

        /*--------------------------------------------------
     			display: the content
         --------------------------------------------------*/
        $content = $myrow['content'];
        $content = Text::make_clickable($content);
        echo "<tr class='row_even'>";
        echo "<td colspan='3'>";

        echo $content;
        // show attachment list
        if (!empty($attachment_list)) {

            $realname = $attachment_list['path'];
            $user_filename = $attachment_list['filename'];
            $full_file_name = 'download.php?file='.$realname;
            echo Display::return_icon('attachment.gif', get_lang('Attachment'));
            echo '<a href="'.$full_file_name.'';
            echo ' "> '.$user_filename.' </a>';
            echo '<span class="forum_attach_comment" >'.$attachment_list['comment'].'</span>';
            if (api_is_allowed_to_edit()) {
                echo '&nbsp;&nbsp;<a href="'.api_get_self().'?'.api_get_cidreq().'&amp;origin='.Security::remove_XSS(
                    $_GET['origin']
                ).'&amp;action=delete_attach&amp;id_attach='.$attachment_list['id'].'" onclick="javascript:if(!confirm(\''.addslashes(
                    api_htmlentities(get_lang("ConfirmYourChoice"), ENT_QUOTES, $charset)
                ).'\')) return false;">'.Display::return_icon('delete.gif', get_lang('Delete')).'</a><br />';
            }

        }

        echo '</td></tr>';


        /*--------------------------------------------------
     			display: the added resources
         --------------------------------------------------
    	if (check_added_resources("Agenda", $myrow["id"]))
    	{

    		echo '<tr>';
    		echo '<td colspan="3">';
    		echo "<i>".get_lang("AddedResources")."</i><br/>";
    		if ($myrow['visibility']==0)
    		{
    			$addedresource_style="invisible";
    		}
    		display_added_resources("Agenda", $myrow["id"], $addedresource_style);
    		echo "</td></tr>";
    	}*/


        $event_list .= $myrow['id'].',';

        $counter++;
        /*--------------------------------------------------
    	 display: jump-to-top icon
         --------------------------------------------------*/
        echo '<tr>';
        echo '<td colspan="3">';
        if ($is_repeated) {
            echo get_lang('RepeatedEvent'), '<a href="', api_get_self(
            ), '?', api_get_cidreq, '&amp;agenda_id=', $myrow['parent_event_id'], '" alt="', get_lang(
                'RepeatedEventViewOriginalEvent'
            ), '">', get_lang('RepeatedEventViewOriginalEvent'), '</a>';
        }
        echo "<a href=\"#top\">".Display::return_icon('top.gif', get_lang('Top'))."</a></td></tr>";
        echo "</table><br /><br />";
    } // end while ($myrow=Database::fetch_array($result))

    if (!empty($event_list)) {
        $event_list = substr($event_list, 0, -1);
    } else {
        $event_list = '0';
    }

    echo "<form name=\"event_list_form\"><input type=\"hidden\" name=\"event_list\" value=\"$event_list\" /></form>";

    // closing the layout table
    echo "</td>",
    "</tr>",
    "</table>";
}

/**
 * Displays only 1 agenda item. This is used when an agenda item is added to the learning path.
 * @author Patrick Cool <patrick.cool@UGent.be>, Ghent University
 */
function display_one_agenda_item($agenda_id)
{
    global $select_month, $select_year;
    global $DaysShort, $DaysLong, $MonthsLong;
    global $dateFormatLong, $timeNoSecFormat, $charset;
    global $_user;

    $TABLEAGENDA = Database::get_main_table(TABLE_MAIN_SYSTEM_CALENDAR);
    $TABLE_ITEM_PROPERTY = Database::get_course_table(TABLE_ITEM_PROPERTY);

    $agenda_id = Database::escape_string($agenda_id);
    //echo "displaying agenda items";

    // getting the name of the groups
    //$group_names=get_course_groups();

    /*--------------------------------------------------
			CONSTRUCT THE SQL STATEMENT
	  --------------------------------------------------*/

    $sql = "SELECT *	FROM ".$TABLEAGENDA;
    $result = Database::query($sql) or die(Database::error());
    $number_items = Database::num_rows($result);
    $myrow = Database::fetch_array($result); // there should be only one item so no need for a while loop

    $sql_rep = "SELECT * FROM $TABLEAGENDA WHERE id = $agenda_id";
    $res_rep = Database::query($sql_rep);
    $repeat = false;
    $repeat_id = 0;
    if (Database::num_rows($res_rep) > 0) {
        $repeat = true;
        $row_rep = Database::fetch_array($res_rep);
        //$repeat_id = $row_rep['parent_event_id'];
    }

    /*--------------------------------------------------
			DISPLAY: NO ITEMS
	  --------------------------------------------------*/
    if ($number_items == 0) {
        echo "<table id=\"data_table\" ><tr><td>".get_lang("NoAgendaItems")."</td></tr></table>";
    }

    /*--------------------------------------------------
			DISPLAY: THE ITEMS
	  --------------------------------------------------*/
    echo "<table id=\"data_table\">";

    /*--------------------------------------------------
	 DISPLAY : the icon, title, destinees of the item
	  --------------------------------------------------*/
    echo "<tr>";

    // highlight: if a date in the small calendar is clicked we highlight the relevant items
    $myrow["start_date"] = api_get_local_time($myrow["start_date"], null, date_default_timezone_get());
    $db_date = (int)api_format_date($myrow["start_date"], "%d").intval(
        api_format_date($myrow["start_date"], "%m")
    ).api_format_date($myrow["start_date"], "%Y");
    if ($_GET["day"].$_GET["month"].$_GET["year"] <> $db_date) {
        if ($myrow['visibility'] == '0') {
            $style = "data_hidden";
            $stylenotbold = "datanotbold_hidden";
            $text_style = "text_hidden";
        } else {
            $style = "data";
            $stylenotbold = "datanotbold";
            $text_style = "text";
        }
    } else {
        $style = "datanow";
        $stylenotbold = "datanotboldnow";
        $text_style = "textnow";
    }


    echo "<td class=\"".$style."\">";

    // adding an internal anchor
    echo "<a name=\"".(int)date("d", strtotime($myrow["start_date"]))."\"></a>";

    // the icons. If the message is sent to one or more specific users/groups
    // we add the groups icon
    // 2do: if it is sent to groups we display the group icon, if it is sent to a user we show the user icon
    echo Display::return_icon('agenda.gif');
    if ($myrow['to_group_id'] !== '0') {
        echo Display::return_icon('group.gif');
    }
    echo " ".$myrow['title']."";
    echo "</td>";

    // the message has been sent to
    echo "<td class=\"".$stylenotbold."\">".get_lang("SentTo").": ".get_lang('AllUsersOfThePlatform');
    //$sent_to = sent_to(TOOL_CALENDAR_EVENT, $myrow["ref"]);
    //sent_to_form=sent_to_form($sent_to);
    //echo $sent_to_form;
    echo "</td></tr>";

    /*--------------------------------------------------
	 			DISPLAY: the title
	  --------------------------------------------------*/
    echo "<tr class=\"".$stylenotbold."\">";
    echo "<td>".get_lang("StartTime").": ";
    echo api_format_date($myrow["start_date"]);
    echo "</td>";
    echo "<td>".get_lang("EndTime").": ";
    echo api_convert_and_format_date($myrow["end_date"], null, date_default_timezone_get());
    echo "</td>";
    echo "</tr>";

    /*--------------------------------------------------
	 			DISPLAY: the content
	  --------------------------------------------------*/
    $export_icon = '../img/export.png';
    $export_icon_low = '../img/export_low_fade.png';
    $export_icon_high = '../img/export_high_fade.png';

    $content = $myrow['content'];
    $content = Text::make_clickable($content);
    //echo "<tr><td class=\"".$text_style."\" colspan='2'>";
    //echo $content;
    //echo "</td></tr>";
    echo "<tr class='row_even'>";
    echo '<td colspan="2">';
    echo $content;
    echo '</td></tr>';

    /*--------------------------------------------------
	 			DISPLAY: the added resources
	  --------------------------------------------------*/
    /*
	if (check_added_resources("Agenda", $myrow["id"]))
		{
		echo "<tr><td colspan='2'>";
		echo "<i>".get_lang("AddedResources")."</i><br/>";
		if ($myrow['visibility']==0)
		{
			$addedresource_style="invisible";
		}
		display_added_resources("Agenda", $myrow["id"], $addedresource_style);
		echo "</td></tr>";
		}
	*/
    /*--------------------------------------------------
		DISPLAY: edit delete button (course admin only)
	  --------------------------------------------------*/
    echo '<tr><td colspan="2">';
    if (!$repeat && api_is_allowed_to_edit(false, true)) {
        // edit
        $mylink = api_get_self()."?".api_get_cidreq()."&amp;origin=".Security::remove_XSS(
            $_GET['origin']
        )."&amp;id=".$myrow['id'];
        echo     "<a href=\"".$mylink."&amp;action=edit\">",
        Display::return_icon('edit.gif', get_lang('ModifyCalendarItem')), "</a>",
            "<a href=\"".$mylink."&amp;action=delete\" onclick=\"javascript:if(!confirm('".addslashes(
                api_htmlentities(get_lang("ConfirmYourChoice"), ENT_QUOTES, $charset)
            )."')) return false;\">",
        Display::return_icon('delete.gif', get_lang('Delete')), "</a>";
        if ($myrow['visibility'] == 1) {
            $image_visibility = "visible";
        } else {
            $image_visibility = "invisible";
        }
        echo     '<a href="'.$mylink.'&amp;action=showhide">', Display::return_icon(
            $image_visibility,
            get_lang('Visible')
        ), '</a><br /><br />';
    }
    $mylink = 'calendar_ical_export.php?'.api_get_cidreq().'&amp;type=course&amp;id='.$myrow['id'];
    echo '<a class="ical_export" href="'.$mylink.'&amp;class=confidential" title="'.get_lang(
        'ExportiCalConfidential'
    ).'">'.Display::return_icon($export_icon_high, get_lang('ExportiCalConfidential')).'</a> ';
    echo '<a class="ical_export" href="'.$mylink.'&amp;class=private" title="'.get_lang(
        'ExportiCalPrivate'
    ).'">'.Display::return_icon($export_icon_low, get_lang('ExportiCalPrivate')).'</a> ';
    echo '<a class="ical_export" href="'.$mylink.'&amp;class=public" title="'.get_lang(
        'ExportiCalPublic'
    ).'">'.Display::return_icon($export_icon, get_lang('ExportiCalPublic')).'</a> ';
    echo '<a href="#" onclick="javascript:win_print=window.open(\'calendar_view_print.php?id='.$myrow['id'].'\',\'popup\',\'left=100,top=100,width=700,height=500,scrollbars=1,resizable=0\'); win_print.focus(); return false;">'.Display::return_icon(
        'print.gif',
        get_lang('Print')
    ).'</a>&nbsp;';
    echo "</td>";
    if ($repeat) {
        echo '<tr>';
        echo '<td colspan="2">', get_lang('RepeatedEvent'), '<a href="', api_get_self(), '?', api_get_cidreq(
        ), '&amp;agenda_id=', $repeat_id, '" alt="', get_lang('RepeatedEventViewOriginalEvent'), '">', get_lang(
            'RepeatedEventViewOriginalEvent'
        ), '</a></td>';
        echo '</tr>';
    }
    echo "</table>";

    // closing the layout table
    echo "</td>",
    "</tr>",
    "</table>";
}

/**
 * (This function is probably deprecated for this module)
 * Show the form for adding a new agenda item. This is the same function that is used whenever we are editing an
 * agenda item. When the id parameter is empty (default behaviour), then we show an empty form, else we are editing and
 * we have to retrieve the information that is in the database and use this information in the forms.
 * @author Patrick Cool <patrick.cool@UGent.be>, Ghent University
 * @param integer id, the id of the agenda item we are editing. By default this is empty which means that we are adding an
 *         agenda item.
 */
function show_group_filter_form()
{
    /** @todo this select missing to implement */
//$group_list=get_course_groups();

    echo "<select name=\"select\" onchange=\"MM_jumpMenu('parent',this,0)\">";
    echo "<option value=\"agenda.php?group=none\">show all groups</option>";
    /*foreach($group_list as $this_group)
	{
	// echo "<option value=\"agenda.php?isStudentView=true&amp;group=".$this_group['id']."\">".$this_group['name']."</option>";
	echo "<option value=\"agenda.php?group=".$this_group['id']."\" ";
	echo ($this_group['id']==$_SESSION['group'])? " selected":"" ;
	echo ">".$this_group['name']."</option>";
	}
*/
    echo "</select>";
}

function show_user_filter_form()
{

    /** @todo this select missing to implement */

//$user_list=get_course_users();
    echo "<select name=\"select\" onchange=\"MM_jumpMenu('parent',this,0)\">";
    echo "<option value=\"agenda.php?user=none\">show all users</option>";
    /*foreach($user_list as $this_user)
	{
	// echo "<option value=\"agenda.php?isStudentView=true&amp;user=".$this_user['uid']."\">".$this_user['lastName']." ".$this_user['firstName']."</option>";
	echo "<option value=\"agenda.php?user=".$this_user['uid']."\" ";
	echo ($this_user['uid']==$_SESSION['user'])? " selected":"" ;
	echo ">".$this_user['lastName']." ".$this_user['firstName']."</option>";
	}*/
    echo "</select>";
}

function show_user_group_filter_form()
{
    /** @todo this select missing to implement */
    echo "<select name=\"select\" onchange=\"MM_jumpMenu('parent',this,0)\">";
    echo "<option value=\"agenda.php?user=none\">".get_lang("ShowAll")."</option>";

    // Groups
    echo "<optgroup label=\"".get_lang("Groups")."\">";
    //$group_list=get_course_groups();
    /*	foreach($group_list as $this_group)
	{
		// echo "<option value=\"agenda.php?isStudentView=true&amp;group=".$this_group['id']."\">".$this_group['name']."</option>";
		echo "<option value=\"agenda.php?group=".$this_group['id']."\" ";
		echo ($this_group['id']==$_SESSION['group'])? " selected":"" ;
		echo ">".$this_group['name']."</option>";
	}*/
    echo "</optgroup>";

    // Users
    echo "<optgroup label=\"".get_lang("Users")."\">";
    //$user_list=get_course_users();
    /*	foreach($user_list as $this_user)
		{
		// echo "<option value=\"agenda.php?isStudentView=true&amp;user=".$this_user['uid']."\">".$this_user['lastName']." ".$this_user['firstName']."</option>";
		echo "<option value=\"agenda.php?user=".$this_user['uid']."\" ";
		echo ($this_user['uid']==$_SESSION['user'])? " selected":"" ;
		echo ">".$this_user['lastName']." ".$this_user['firstName']."</option>";
		}*/
    echo "</optgroup>";
    echo "</select>";
}

function show_add_form($id = '')
{
    global $MonthsLong;

    $htmlHeadXtra[] = to_javascript();
    // the default values for the forms
    if ($_GET['originalresource'] !== 'no') {
        $day = date('d');
        $month = date('m');
        $year = date('Y');
        $hours = 9;
        $minutes = '00';

        $end_day = date('d');
        $end_month = date('m');
        $end_year = date('Y');
        $end_hours = 17;
        $end_minutes = '00';
        $repeat = false;
    } else {
        // we are coming from the resource linker so there might already have been some information in the form.
        // When we clicked on the button to add resources we stored every form information into a session and now we
        // are doing the opposite thing: getting the information out of the session and putting it into variables to
        // display it in the forms.
        $form_elements = $_SESSION['formelements'];
        $day = $form_elements['day'];
        $month = $form_elements['month'];
        $year = $form_elements['year'];
        $hours = $form_elements['hour'];
        $minutes = $form_elements['minutes'];
        $end_day = $form_elements['end_day'];
        $end_month = $form_elements['end_month'];
        $end_year = $form_elements['end_year'];
        $end_hours = $form_elements['end_hours'];
        $end_minutes = $form_elements['end_minutes'];
        $title = $form_elements['title'];
        $content = $form_elements['content'];
        $id = $form_elements['id'];
        $to = $form_elements['to'];
        $repeat = $form_elements['repeat'];
    }


    //	switching the send to all/send to groups/send to users
    if ($_POST['To']) {
        $day = $_POST['fday'];
        $month = $_POST['fmonth'];
        $year = $_POST['fyear'];
        $hours = $_POST['fhour'];
        $minutes = $_POST['fminute'];
        $end_day = $_POST['end_fday'];
        $end_month = $_POST['end_fmonth'];
        $end_year = $_POST['end_fyear'];
        $end_hours = $_POST['end_fhour'];
        $end_minutes = $_POST['end_fminute'];
        $title = $_POST['title'];
        $content = $_POST['content'];
        // the invisible fields
        $action = $_POST['action'];
        $id = $_POST['id'];
        $repeat = !empty($_POST['repeat']) ? true : false;
    }


    // if the id is set then we are editing an agenda item

    if (is_int($id)) {
        //echo "before get_agenda_item".$_SESSION['allow_individual_calendar'];
        $item_2_edit = get_agenda_item($id);

        $title = $item_2_edit['title'];
        $content = $item_2_edit['content'];

        // start date
        $item_2_edit['start_date'] = api_get_local_time($item_2_edit['start_date']);

        // start date
        list($datepart, $timepart) = split(" ", $item_2_edit['start_date']);
        list($year, $month, $day) = explode("-", $datepart);
        list($hours, $minutes, $seconds) = explode(":", $timepart);

        // end date
        $item_2_edit['end_date'] = api_get_local_time($item_2_edit['end_date']);
        list($datepart, $timepart) = split(" ", $item_2_edit['end_date']);
        list($end_year, $end_month, $end_day) = explode("-", $datepart);
        list($end_hours, $end_minutes, $end_seconds) = explode(":", $timepart);
        // attachments
        //edit_added_resources("Agenda", $id);
        $to = $item_2_edit['to'];
        //echo "<br />after get_agenda_item".$_SESSION['allow_individual_calendar'];
    }
    $content = stripslashes($content);
    $title = stripslashes($title);
    // we start a completely new item, we do not come from the resource linker
    if ($_GET['originalresource'] !== "no" and $_GET['action'] == "add") {
        $_SESSION["formelements"] = null;
    }
    ?>

<!-- START OF THE FORM  -->
<form enctype="multipart/form-data" action="<?php echo api_get_self().'?origin='.Security::remove_XSS(
    $_GET['origin']
).'&amp;action='.Security::remove_XSS($_GET['action']); ?>" method="post" name="new_calendar_item">
<input type="hidden" name="id" value="<?php if (isset($id)) {
    echo $id;
} ?>"/>
<input type="hidden" name="action"
       value="<?php if (isset($_GET['action'])) {
           echo Security::remove_XSS($_GET['action']);
       } ?>"/>
<input type="hidden" name="sort" value="asc"/>
<input type="hidden" name="submit_event" value="ok"/>
    <?php
    echo '<legend>';
    echo (isset($id) AND $id <> '') ? get_lang('ModifyCalendarItem') : get_lang("AddCalendarItem");
    echo '<legend>';
    ?>
<table border="0" cellpadding="5" cellspacing="0" width="80%" id="newedit_form">
<!-- START date and time -->
<tr>
    <div>
        <table border="0" width="100%">
            <tr>
                <td colspan="4">
                    <div id="err_date" style="display:none;color:red"></div>
                    <div id="err_start_date" style="display:none;color:red"></div>
                </td>
            </tr>
            <td width="10%">
                <!-- date: 1 -> 31 -->
                <nobr><?php echo get_lang('StartDate').": "; ?></nobr>
            </td>
            <td width="35%">
                <select name="fday" onchange="javascript:document.new_calendar_item.end_fday.value=this.value;">
                    <?php
                    // small loop for filling all the dates
                    // 2do: the available dates should be those of the selected month => february is from 1 to 28 (or 29) and not to 31
                    foreach (range(1, 31) as $i) {
                        // values have to have double digits
                        $value = ($i <= 9 ? '0'.$i : $i);
                        // the current day is indicated with [] around the date
                        if ($value == $day) {
                            echo " <option value=\"".$value."\" selected> ".$i." </option>";
                        } else {
                            echo "<option value=\"$value\">$i</option>";
                        }
                    }
                    ?>
                </select>
                <!-- month: january -> december -->
                <select name="fmonth" onchange="javascript:document.new_calendar_item.end_fmonth.value=this.value;">
                    <?php
                    for ($i = 1; $i <= 12; $i++) {
                        // values have to have double digits
                        if ($i <= 9) {
                            $value = "0".$i;
                        } else {
                            $value = $i;
                        }
                        if ($value == $month) {
                            echo " <option value=\"".$value."\" selected>".$MonthsLong[$i - 1]."</option>\n";
                        } else {
                            echo " <option value=\"".$value."\">".$MonthsLong[$i - 1]."</option>\n";
                        }
                    } ?>
                </select>
                <select name="fyear" onchange="javascript:document.new_calendar_item.end_fyear.value=this.value;">
                    <option value="<?php echo ($year - 1); ?>"><?php echo ($year - 1); ?></option>
                    <option value="<?php echo $year; ?>" selected="selected"><?php echo $year; ?></option>
                    <?php
                    echo "\n";
                    for ($i = 1; $i <= 5; $i++) {
                        $value = $year + $i;
                        echo "<option value=\"$value\">$value</option>\n";
                    } ?>
                </select>
                <a href="javascript:openCalendar('new_calendar_item','f')"><?php Display::display_icon(
                    'calendar_select.gif',
                    get_lang('Select'),
                    array('style' => 'vertical-align: middle;')
                ); ?></a>
            </td>
            <td width="10%">
                <nobr><?php echo get_lang('StartTime').": \n"; ?></nobr>
            </td>
            <td>
                <select name="fhour" onchange="javascript:document.new_calendar_item.end_fhour.value=this.value;">
                    <!-- <option value="--">--</option> -->
                    <?php
                    echo "\n";
                    foreach (range(0, 23) as $i) {
                        // values have to have double digits
                        $value = ($i <= 9 ? '0'.$i : $i);
                        // the current hour is indicated with [] around the hour
                        if ($hours == $value) {
                            echo "<option value=\"".$value."\" selected> ".$value." </option>\n";
                        } else {
                            echo "<option value=\"$value\">$value</option>\n";
                        }
                    } ?>
                </select>

                <select name="fminute" onchange="javascript:document.new_calendar_item.end_fminute.value=this.value;">
                    <!-- <option value="<?php echo $minutes ?>"><?php echo $minutes; ?></option> -->
                    <!-- <option value="--">--</option> -->
                    <?php
                    foreach (range(0, 59) as $i) {
                        // values have to have double digits
                        $value = ($i <= 9 ? '0'.$i : $i);
                        if ($minutes == $value) {
                            echo "<option value=\"".$value."\" selected> ".$value." </option>";
                        } else {
                            echo "<option value=\"$value\">$value</option>";
                        }
                    } ?>
                </select>
            </td>

    </div>
</tr>
<!-- END date and time -->
<tr>
    <div>
        <tr>
            <td colspan="4">
                <div id="err_end_date" style="display:none;color:red"></div>
            </td>
        </tr>
        <td>
            <!-- date: 1 -> 31 -->
            <nobr><?php echo get_lang('EndDate').": "; ?></nobr>
        </td>
        <td>
            <select name="end_fday">
                <?php
                // small loop for filling all the dates
                // 2do: the available dates should be those of the selected month => february is from 1 to 28 (or 29) and not to 31
                echo "\n";
                foreach (range(1, 31) as $i) {
                    // values have to have double digits
                    $value = ($i <= 9 ? '0'.$i : $i);
                    // the current day is indicated with [] around the date
                    if ($value == $end_day) {
                        echo " <option value=\"".$value."\" selected> ".$i." </option>\n";
                    } else {
                        echo " <option value=\"".$value."\">".$i."</option>\n";
                    }
                }?>
            </select>
            <!-- month: january -> december -->
            <select name="end_fmonth">
                <?php
                echo "\n";
                foreach (range(1, 12) as $i) {
                    // values have to have double digits
                    $value = ($i <= 9 ? '0'.$i : $i);
                    if ($value == $end_month) {
                        echo " <option value=\"".$value."\" selected>".$MonthsLong[$i - 1]."</option>\n";
                    } else {
                        echo " <option value=\"".$value."\">".$MonthsLong[$i - 1]."</option>\n";
                    }
                }?>
            </select>
            <select name="end_fyear">
                <option value="<?php echo ($end_year - 1) ?>"><?php echo ($end_year - 1) ?></option>
                <option value="<?php echo $end_year ?>" selected> <?php echo $end_year ?> </option>
                <?php
                echo "\n";
                for ($i = 1; $i <= 5; $i++) {
                    $value = $end_year + $i;
                    echo "<option value=\"$value\">$value</option>\n";
                } ?>
            </select>
            <a href="javascript:openCalendar('new_calendar_item', 'end_f')"><?php Display::display_icon(
                'calendar_select.gif',
                get_lang('Select'),
                array('style' => 'vertical-align: middle;')
            ); ?></a>
        </td>
        <td>
            <nobr><?php echo get_lang('EndTime').": \n"; ?></nobr>
        </td>
        <td>
            <select name="end_fhour">
                <!-- <option value="--">--</option> -->
                <?php
                echo "\n";
                foreach (range(0, 23) as $i) {
                    // values have to have double digits
                    $value = ($i <= 9 ? '0'.$i : $i);
                    // the current hour is indicated with [] around the hour
                    if ($end_hours == $value) {
                        echo "<option value=\"".$value."\" selected> ".$value." </option>\n";
                    } else {
                        echo "<option value=\"".$value."\"> ".$value." </option>\n";
                    }
                } ?>
            </select>

            <select name="end_fminute">
                <!-- <option value="<?php echo $end_minutes; ?>"><?php echo $end_minutes; ?></option> -->
                <!-- <option value="--">--</option> -->
                <?php
                foreach (range(0, 59) as $i) {
                    // values have to have double digits
                    $value = ($i <= 9 ? '0'.$i : $i);
                    if ($minutes == $value) {
                        echo "<option value=\"".$value."\" selected> ".$value." </option>";
                    } else {
                        echo "<option value=\"$value\">$value</option>";
                    }
                } ?>
            </select>
            <br>
        </td>
    </div>
</tr>
<tr>
    <td colspan="4">
        <hr noshade="noshade" color="#cccccc"/>
        <div id="err_title" style="display:none;color:red"></div>
    </td>
</tr>
<tr class="subtitle">
    <td colspan="4" valign="top"><?php echo get_lang('ItemTitle'); ?> :
        <!--<div style='margin-left: 80px'><textarea name="title" cols="50" rows="2" wrap="virtual" style="vertical-align:top; width:75%; height:50px;"><?php  if (isset($title)) {
            echo $title;
        } ?></textarea></div>-->
        <input type="text" size="60" name="title" value="<?php  if (isset($title)) {
            echo $title;
        } ?>"/>
    </td>
</tr>
<tr>
    <td colspan="4">
        <?php

        $oFCKeditor = new FCKeditor('content');
        $oFCKeditor->ToolbarSet = 'GlobalAgenda';
        $oFCKeditor->Width = '100%';
        $oFCKeditor->Height = '175';
        $oFCKeditor->Value = $content;

        $return = $oFCKeditor->CreateHtml();

        echo $return;

        ?>
    </td>
</tr>
    <?php
    echo "<tr>\n";
    echo "<td colspan=\"4\">";
    $test = $_SESSION['addedresource'];
    echo "</td>\n</tr>";
    if (empty($id)) //only show repeat fields when adding the first time
    {
        ?>

    <tr>
        <td colspan="4"/>
    </tr>
        <?php
    }//only show repeat fields if adding, not if editing
    ?>
<tr>
    <td colspan="4">
        <?php
        if ($_GET['action'] == 'edit') {
            $class = 'save';
            $text = get_lang('ModifyEvent');

        } else {
            $class = 'add';
            $text = get_lang('AddEvent');
        }
        ?>
        <button type="button" class="add" value="<?php echo get_lang('Ok'); ?>"
                onclick="validate_date()"><?php echo $text;  ?></button>

    </td>
</tr>
</table>
</form>
<?php
}

function get_agendaitems($month, $year)
{
    global $_user;
    global $_configuration;
    $month = Database::escape_string($month);
    $year = Database::escape_string($year);

    $items = array();

    //databases of the courses
    $TABLEAGENDA = Database :: get_main_table(TABLE_MAIN_SYSTEM_CALENDAR);

    // if the user is administrator of that course we show all the agenda items
    //if (api_is_allowed_to_edit())
    //{
    //echo "course admin";
    $sqlquery = "SELECT
						DISTINCT *
						FROM ".$TABLEAGENDA."
						WHERE
						MONTH(start_date)='".$month."'
						AND YEAR(start_date)='".$year."'
						GROUP BY id
						ORDER BY start_date ";
    //}
    // if the user is not an administrator of that course
    /*	else
	{
		//echo "GEEN course admin";
		if (is_array($group_memberships) && count($group_memberships)>0)
		{
			$sqlquery = "SELECT
							agenda.*
							FROM ".$TABLEAGENDA."
							WHERE
							MONTH(agenda.start_date)='".$month."'
							AND YEAR(agenda.start_date)='".$year."'
							ORDER BY start_date ";
		}
		else
		{
			$sqlquery = "SELECT
							agenda.*, item_property.*
							FROM ".$TABLEAGENDA."
							WHERE
							MONTH(agenda.start_date)='".$month."'
							AND YEAR(agenda.start_date)='".$year."'
							ORDER BY start_date ";
		}
	}*/

    //$mycourse = api_get_course_info();
    $portal_url = $_configuration['root_web'];
    if ($_configuration['multiple_access_urls']) {
        $access_url_id = api_get_current_access_url_id();
        if ($access_url_id != -1) {
            $url = api_get_access_url($access_url_id);
            $portal_url = $url['url'];
        }
    }

    $result = Database::query($sqlquery);
    while ($item = Database::fetch_array($result)) {
        $agendaday_string = api_convert_and_format_date($item['start_date'], "%d", date_default_timezone_get());
        $agendaday = intval($agendaday_string);
        $time = api_convert_and_format_date($item['start_date'], TIME_NO_SEC_FORMAT, date_default_timezone_get());
        $URL = $portal_url.'main/admin/agenda.php?day='.$agendaday."&amp;month=".$month."&amp;year=".$year; // RH  //Patrick Cool: to highlight the relevant agenda item
        $items[$agendaday][$item['start_time']] .= '<i>'.$time.'</i> <a href="'.$URL.'" title="'.$item['title'].'<br />';
    }

    // sorting by hour for every day
    $agendaitems = array();
    while (list ($agendaday, $tmpitems) = each($items)) {
        sort($tmpitems);
        while (list ($key, $val) = each($tmpitems)) {
            $agendaitems[$agendaday] .= $val;
        }
    }

    return $agendaitems;
}

function display_upcoming_events()
{
    echo '<br /><b>'.get_lang('UpcomingEvent').'</b><br />';
    $number_of_items_to_show = (int)api_get_setting('number_of_upcoming_events');

    //databases of the courses
    $TABLEAGENDA = Database :: get_main_table(TABLE_MAIN_SYSTEM_CALENDAR);
    //$TABLE_ITEMPROPERTY = Database :: get_course_table(TABLE_ITEM_PROPERTY);
    //$mycourse = api_get_course_info();
    //$myuser = api_get_user_info();

    //$group_memberships = GroupManager :: get_group_ids($mycourse['dbName'], $myuser['user_id']);
    // if the user is administrator of that course we show all the agenda items
    /*if (api_is_allowed_to_edit())
	{*/
    //echo "course admin";
    $sqlquery = "SELECT DISTINCT * FROM ".$TABLEAGENDA;

    global $_configuration;
    $current_access_url_id = 1;
    if ($_configuration['multiple_access_urls']) {
        $current_access_url_id = api_get_current_access_url_id();
    }
    $sqlquery .= "WHERE access_url_id = $current_access_url_id ";

    $sqlquery .= " ORDER BY start_date ";
    //}
    // if the user is not an administrator of that course
    $result = Database::query($sqlquery);
    $counter = 0;
    while ($item = Database::fetch_array($result, 'ASSOC')) {
        if ($counter < $number_of_items_to_show) {
            echo api_get_local_time($item['start_date']), ' - ', $item['title'], '<br />';
            $counter++;
        }
    }
}

/**
 * This function calculates the startdate of the week (monday)
 * and the enddate of the week (sunday)
 * and returns it as an array
 */
function calculate_start_end_of_week($week_number, $year)
{
    // determine the start and end date
    // step 1: we calculate a timestamp for a day in this week
    $random_day_in_week = mktime(
        0,
        0,
        0,
        1,
        1,
        $year
    ) + ($week_number) * (7 * 24 * 60 * 60); // we calculate a random day in this week
    // step 2: we which day this is (0=sunday, 1=monday, ...)
    $number_day_in_week = date('w', $random_day_in_week);
    // step 3: we calculate the timestamp of the monday of the week we are in
    $start_timestamp = $random_day_in_week - (($number_day_in_week - 1) * 24 * 60 * 60);
    // step 4: we calculate the timestamp of the sunday of the week we are in
    $end_timestamp = $random_day_in_week + ((7 - $number_day_in_week + 1) * 24 * 60 * 60) - 3600;
    // step 5: calculating the start_day, end_day, start_month, end_month, start_year, end_year
    $start_day = date('j', $start_timestamp);
    $start_month = date('n', $start_timestamp);
    $start_year = date('Y', $start_timestamp);
    $end_day = date('j', $end_timestamp);
    $end_month = date('n', $end_timestamp);
    $end_year = date('Y', $end_timestamp);
    $start_end_array['start']['day'] = $start_day;
    $start_end_array['start']['month'] = $start_month;
    $start_end_array['start']['year'] = $start_year;
    $start_end_array['end']['day'] = $end_day;
    $start_end_array['end']['month'] = $end_month;
    $start_end_array['end']['year'] = $end_year;

    return $start_end_array;
}

/**
 * Show the mini calendar of the given month
 */
function display_daycalendar($agendaitems, $day, $month, $year, $weekdaynames, $monthName)
{
    global $DaysShort, $DaysLong, $course_path;
    global $MonthsLong;
    global $query;

    // timestamp of today
    $today = mktime();
    $nextday = $today + (24 * 60 * 60);
    $previousday = $today - (24 * 60 * 60);
    // the week number of the year
    $week_number = date("W", $today);
    // if we moved to the next / previous day we have to recalculate the $today variable
    if ($_GET['day']) {
        $today = mktime(0, 0, 0, $month, $day, $year);
        $nextday = $today + (24 * 60 * 60);
        $previousday = $today - (24 * 60 * 60);
        $week_number = date("W", $today);
    }
    // calculating the start date of the week
    // the date of the monday of this week is the timestamp of today minus
    // number of days that have already passed this week * 24 hours * 60 minutes * 60 seconds
    $current_day = date("j", $today); // Day of the month without leading zeros (1 to 31) of today
    $day_of_the_week = date(
        "w",
        $today
    ); // Numeric representation of the day of the week	0 (for Sunday) through 6 (for Saturday) of today
    //$timestamp_first_date_of_week=$today-(($day_of_the_week-1)*24*60*60); // timestamp of the monday of this week
    //$timestamp_last_date_of_week=$today+((7-$day_of_the_week)*24*60*60); // timestamp of the sunday of this week
    // we are loading all the calendar items of all the courses for today
    echo "<table class=\"data_table\">\n";
    // the forward and backwards url
    $backwardsURL = api_get_self()."?coursePath=".urlencode($course_path)."&amp;courseCode=".Security::remove_XSS(
        $_GET['courseCode']
    )."&amp;action=view&amp;view=day&amp;day=".date("j", $previousday)."&amp;month=".date(
        "n",
        $previousday
    )."&amp;year=".date("Y", $previousday);
    $forewardsURL = api_get_self()."?coursePath=".urlencode($course_path)."&amp;courseCode=".Security::remove_XSS(
        $_GET['courseCode']
    )."&amp;action=view&amp;view=day&amp;day=".date("j", $nextday)."&amp;month=".date("n", $nextday)."&amp;year=".date(
        "Y",
        $nextday
    );
    // The title row containing the day
    echo "<tr>\n", "<th width=\"10%\"><a href=\"", $backwardsURL, "\">".Display::return_icon(
        'action_prev.png',
        get_lang('Previous')
    )."</a></th>\n", "<th>";
    echo $DaysLong[$day_of_the_week]." ".date("j", $today)." ".$MonthsLong[date("n", $today) - 1]." ".date("Y", $today);
    echo "</th>";
    echo "<th width=\"10%\"><a href=\"", $forewardsURL, "\">".Display::return_icon(
        'action_next.png',
        get_lang('Next')
    )."</a></th>\n";
    echo "</tr>\n";
    // the rows for each half an hour
    for ($i = 10; $i < 48; $i++) {
        if ($i % 2 == 0) {
            $class = "class=\"row_even\"";
        } else {
            $class = "class=\"row_odd\"";
        }
        echo "<tr $class>\n";
        echo "";
        if ($i % 2 == 0) {
            echo ("<td valign=\"top\" width=\"75\">".(($i) / 2)." ".get_lang("HourShort")." 00</td>\n");
        } else {
            echo ("<td valign=\"top\" width=\"75\">".((($i) / 2) - (1 / 2))." ".get_lang("HourShort")." 30</td>\n");
        }
        echo "<td $class valign=\"top\" colspan=\"2\">\n";
        if (is_array($agendaitems[$i])) {
            foreach ($agendaitems[$i] as $key => $value) {
                echo $value;
            }
        } else {
            echo $agendaitems[$i];
        }
        echo "</td>\n";
        echo "</tr>\n";
    }
    echo "</table>\n";
}

/**
 *    Display the weekly view of the calendar
 */
function display_weekcalendar($agendaitems, $month, $year, $weekdaynames, $monthName)
{
    global $DaysShort, $course_path;
    global $MonthsLong;
    // timestamp of today
    $today = time();
    $day_of_the_week = date("w", $today);
    $thisday_of_the_week = date("w", $today);
    // the week number of the year
    $week_number = date("W", $today);
    $thisweek_number = $week_number;
    // if we moved to the next / previous week we have to recalculate the $today variable
    if ($_GET['week']) {
        $today = mktime(0, 0, 0, 1, 1, $year);
        $today = $today + (((int)$_GET['week'] - 1) * (7 * 24 * 60 * 60));
        $week_number = date("W", $today);
    }
    // calculating the start date of the week
    // the date of the monday of this week is the timestamp of today minus
    // number of days that have already passed this week * 24 hours * 60 minutes * 60 seconds
    $current_day = date("j", $today); // Day of the month without leading zeros (1 to 31) of today
    $day_of_the_week = date(
        "w",
        $today
    ); // Numeric representation of the day of the week	0 (for Sunday) through 6 (for Saturday) of today
    $timestamp_first_date_of_week = $today - (($day_of_the_week - 1) * 24 * 60 * 60); // timestamp of the monday of this week
    $timestamp_last_date_of_week = $today + ((7 - $day_of_the_week) * 24 * 60 * 60); // timestamp of the sunday of this week
    $backwardsURL = api_get_self()."?coursePath=".urlencode($course_path)."&amp;courseCode=".Security::remove_XSS(
        $_GET['courseCode']
    )."&amp;action=view&amp;view=week&amp;week=".($week_number - 1);
    $forewardsURL = api_get_self()."?coursePath=".urlencode($course_path)."&amp;courseCode=".Security::remove_XSS(
        $_GET['courseCode']
    )."&amp;action=view&amp;view=week&amp;week=".($week_number + 1);
    echo "<table id=\"agenda_list\">\n";
    // The title row containing the the week information (week of the year (startdate of week - enddate of week)
    echo "<tr class=\"title\">\n";
    echo "<td width=\"10%\"><a href=\"", $backwardsURL, "\">".Display::return_icon(
        'action_prev.png',
        get_lang('Previous')
    )."</a></td>\n";
    echo "<td colspan=\"5\">".get_lang("Week")." ".$week_number;
    echo " (".$DaysShort['1']." ".date("j", $timestamp_first_date_of_week)." ".$MonthsLong[date(
        "n",
        $timestamp_first_date_of_week
    ) - 1]." ".date("Y", $timestamp_first_date_of_week)." - ".$DaysShort['0']." ".date(
        "j",
        $timestamp_last_date_of_week
    )." ".$MonthsLong[date("n", $timestamp_last_date_of_week) - 1]." ".date("Y", $timestamp_last_date_of_week).')';
    echo "</td>";
    echo "<td width=\"10%\"><a href=\"", $forewardsURL, "\">".Display::return_icon(
        'action_next.png',
        get_lang('Next')
    )."</a></td>", "</tr>";
    // The second row containing the short names of the days of the week
    echo "<tr>\n";
    // this is the Day of the month without leading zeros (1 to 31) of the monday of this week
    $tmp_timestamp = $timestamp_first_date_of_week;
    for ($ii = 1; $ii < 8; $ii++) {
        $is_today = ($ii == $thisday_of_the_week AND (!isset($_GET['week']) OR $_GET['week'] == $thisweek_number));
        echo "<td class=\"weekdays\">";
        if ($is_today) {
            echo "<font color=#CC3300>";
        }
        echo $DaysShort[$ii % 7]." ".date("j", $tmp_timestamp)." ".$MonthsLong[date("n", $tmp_timestamp) - 1];
        if ($is_today) {
            echo "</font>";
        }
        echo "</td>\n";
        // we 24 hours * 60 minutes * 60 seconds to the $tmp_timestamp
        $array_tmp_timestamp[] = $tmp_timestamp;
        $tmp_timestamp = $tmp_timestamp + (24 * 60 * 60);
    }
    echo "</tr>\n";
    // the table cells containing all the entries for that day
    echo "<tr>\n";
    $counter = 0;
    foreach ($array_tmp_timestamp as $key => $value) {
        if ($counter < 5) {
            $class = "class=\"days_week\"";
        } else {
            $class = "class=\"days_weekend\"";
        }
        if ($counter == $thisday_of_the_week - 1 AND (!isset($_GET['week']) OR $_GET['week'] == $thisweek_number)) {
            $class = "class=\"days_today\"";
        }

        echo "<td ".$class.">";
        echo "<span class=\"agendaitem\">".$agendaitems[date('j', $value)]."&nbsp;</span> ";
        echo "</td>\n";
        $counter++;
    }
    echo "</tr>\n";
    echo "</table>\n";
}

/**
 * Show the monthcalender of the given month
 */
function get_day_agendaitems($courses_dbs, $month, $year, $day)
{
    global $_user;
    global $_configuration;
    global $setting_agenda_link;

    $items = array();

    // get agenda-items for every course
    //$query=Database::query($sql_select_courses);
    foreach ($courses_dbs as $key => $array_course_info) {
        //databases of the courses
        $TABLEAGENDA = Database :: get_main_table(TABLE_MAIN_SYSTEM_CALENDAR);
        //$TABLE_ITEMPROPERTY = Database :: get_course_table(TABLE_ITEM_PROPERTY, $array_course_info['db']);

        // getting all the groups of the user for the current course
        //$group_memberships = GroupManager :: get_group_ids($array_course_info['db'], $_user['user_id']);
        // if the user is administrator of that course we show all the agenda items
        if ($array_course_info['status'] == '1') {
            //echo "course admin";
            $sqlquery = "SELECT DISTINCT *
										FROM ".$TABLEAGENDA."
										WHERE
										DAYOFMONTH(start_date)='".$day."' AND MONTH(start_date)='".$month."' AND YEAR(start_date)='".$year."'
										GROUP BY agenda.id
										ORDER BY start_date ";
        }
        // if the user is not an administrator of that course
        /*else
		{
			//echo "GEEN course admin";
			if (is_array($group_memberships) && count($group_memberships)>0)
			{
				$sqlquery = "SELECT
													agenda.*
													FROM ".$TABLEAGENDA."
													WHERE
													DAYOFMONTH(start_date)='".$day."' AND MONTH(start_date)='".$month."' AND YEAR(start_date)='".$year."'
													ORDER BY start_date ";
			}
			else
			{
				$sqlquery = "SELECT
													agenda.*
													FROM ".$TABLEAGENDA."
													WHERE
													DAYOFMONTH(start_date)='".$day."' AND MONTH(start_date)='".$month."' AND YEAR(start_date)='".$year."'
													ORDER BY start_date ";
			}
		}*/
        //$sqlquery = "SELECT * FROM $agendadb WHERE DAYOFMONTH(day)='$day' AND month(day)='$month' AND year(day)='$year'";
        //echo "abc";
        //echo $sqlquery;
        $result = Database::query($sqlquery);
        $portal_url = $_configuration['root_web'];
        if ($_configuration['multiple_access_urls']) {
            $access_url_id = api_get_current_access_url_id();
            if ($access_url_id != -1) {
                $url = api_get_access_url($access_url_id);
                $portal_url = $url['url'];
            }
        }

        //echo Database::num_rows($result);
        while ($item = Database::fetch_array($result)) {
            // in the display_daycalendar function we use $i (ranging from 0 to 47) for each halfhour
            // we want to know for each agenda item for this day to wich halfhour it must be assigned
            $item['start_date'] = api_get_local_time($item['start_date'], null, date_default_timezone_get());
            list ($datepart, $timepart) = split(" ", $item['start_date']);
            list ($year, $month, $day) = explode("-", $datepart);
            list ($hours, $minutes, $seconds) = explode(":", $timepart);

            $halfhour = 2 * $hours;
            if ($minutes >= '30') {
                $halfhour = $halfhour + 1;
            }

            if ($setting_agenda_link == 'coursecode') {
                $title = $array_course_info['title'];
                $agenda_link = api_substr($title, 0, 14);
            } else {
                $agenda_link = Display::return_icon('course_home.gif');
            }

            //$URL = $_configuration['root_web'].$mycours["dir"]."/";
            $URL = $portal_url.'main/admin/agenda.php?cidReq='."&amp;day=$day&amp;month=$month&amp;year=$year#$day"; // RH  //Patrick Cool: to highlight the relevant agenda item
            $items[$halfhour][] .= "<i>".$hours.":".$minutes."</i> <a href=\"$URL\" title=\"".$array_course_info['name']."\">".$agenda_link."</a>  ".$item['title']."<br />";
        }
    }
    // sorting by hour for every day
    $agendaitems = array();
    while (list($agendaday, $tmpitems) = each($items)) {
        sort($tmpitems);
        while (list($key, $val) = each($tmpitems)) {
            $agendaitems[$agendaday] .= $val;
        }
    }
    $agendaitems = $items;

    //print_r($agendaitems);
    return $agendaitems;
}

/**
 * Return agenda items of the week
 */
function get_week_agendaitems($courses_dbs, $month, $year, $week = '')
{
    global $_user;
    global $_configuration;
    global $setting_agenda_link;

    $TABLEAGENDA = Database :: get_main_table(TABLE_MAIN_SYSTEM_CALENDAR);

    $items = array();
    // The default value of the week
    if ($week == '') {
        $week_number = date("W", time());
    } else {
        $week_number = $week;
    }
    $start_end = calculate_start_end_of_week($week_number, $year);
    $start_filter = $start_end['start']['year']."-".$start_end['start']['month']."-".$start_end['start']['day'];
    $end_filter = $start_end['end']['year']."-".$start_end['end']['month']."-".$start_end['end']['day'];
    // get agenda-items for every course
    foreach ($courses_dbs as $key => $array_course_info) {
        //databases of the courses
        $TABLEAGENDA = Database :: get_main_table(TABLE_MAIN_SYSTEM_CALENDAR);
        //$TABLE_ITEMPROPERTY = Database :: get_course_table(TABLE_ITEM_PROPERTY, $array_course_info["db"]);

        // getting all the groups of the user for the current course
        //	$group_memberships = GroupManager :: get_group_ids($array_course_info["db"], $_user['user_id']);

        // if the user is administrator of that course we show all the agenda items
        //if ($array_course_info['status'] == '1')
        //{
        //echo "course admin";
        $sqlquery = "SELECT DISTINCT * FROM ".$TABLEAGENDA." ORDER BY start_date";
        //}
        // if the user is not an administrator of that course
        //else
        //{
        //echo "GEEN course admin";
        /*			if (is_array($group_memberships) && count($group_memberships)>0)
			{
				$sqlquery = "SELECT *  FROM ".$TABLEAGENDA." ORDER BY a.start_date";
			}
			else*/
        //{
        //	$sqlquery = "SELECT * FROM ".$TABLEAGENDA." ORDER BY a.start_date";
        //}
        //}
        //echo "<pre>".$sqlquery."</pre>";
        // $sqlquery = "SELECT * FROM $agendadb WHERE (DAYOFMONTH(day)>='$start_day' AND DAYOFMONTH(day)<='$end_day')
        //				AND (MONTH(day)>='$start_month' AND MONTH(day)<='$end_month')
        //				AND (YEAR(day)>='$start_year' AND YEAR(day)<='$end_year')";
        $result = Database::query($sqlquery);

        $portal_url = $_configuration['root_web'];
        if ($_configuration['multiple_access_urls']) {
            $access_url_id = api_get_current_access_url_id();
            if ($access_url_id != -1) {
                $url = api_get_access_url($access_url_id);
                $portal_url = $url['url'];
            }
        }

        while ($item = Database::fetch_array($result)) {
            $agendaday_string = api_convert_and_format_date($item['start_date'], "%d", date_default_timezone_get());
            $agendaday = intval($agendaday_string);
            $time = api_convert_and_format_date($item['start_date'], TIME_NO_SEC_FORMAT, date_default_timezone_get());

            if ($setting_agenda_link == 'coursecode') {
                $title = $array_course_info['title'];
                $agenda_link = api_substr($title, 0, 14);
            } else {
                $agenda_link = Display::return_icon('course_home.gif');
            }

            $URL = $portal_url."main/admin/agenda.php?cidReq=".urlencode(
                $array_course_info["code"]
            )."&amp;day=$agendaday&amp;month=$month&amp;year=$year#$agendaday"; // RH  //Patrick Cool: to highlight the relevant agenda item
            $items[$agendaday][$item['start_time']] .= "<i>$time</i> <a href=\"$URL\" title=\"".$array_course_info["name"]."\">".$agenda_link."</a>  ".$item['title']."<br />";
        }
    }
    // sorting by hour for every day
    $agendaitems = array();
    while (list ($agendaday, $tmpitems) = each($items)) {
        sort($tmpitems);
        while (list ($key, $val) = each($tmpitems)) {
            $agendaitems[$agendaday] .= $val;
        }
    }

    //print_r($agendaitems);
    return $agendaitems;
}

/**
 * Get repeated events of a course between two dates (timespan of a day).
 * Returns an array containing the events
 * @param   string  Course info array (as returned by api_get_course_info())
 * @param    int        UNIX timestamp of span start. Defaults 0, later transformed into today's start
 * @param    int        UNIX timestamp. Defaults to 0, later transformed into today's end
 * @param   array   A set of parameters to alter the SQL query
 * @return    array    [int] => [course_id,parent_event_id,start_date,end_date,title,description]
 */
function get_repeated_events_day_view($course_info, $start = 0, $end = 0, $params)
{
    $events = array();
    //initialise all values
    $y = 0;
    $m = 0;
    $d = 0;
    //block $end if higher than 2038 -- PHP doesn't go past that
    if ($end > 2145934800) {
        $end = 2145934800;
    }
    if ($start == 0 or $end == 0) {
        $y = date('Y');
        $m = date('m');
        $d = date('j');
    }
    if ($start == 0) {
        $start = mktime(0, 0, 0, $m, $d, $y);
    }
    $db_start = date('Y-m-d H:i:s', $start);
    if ($end == 0) {
        $end = mktime(23, 59, 59, $m, $d, $y);
    }
    //$db_end = date('Y-m-d H:i:s',$end);

    $t_cal = Database::get_main_table(TABLE_MAIN_SYSTEM_CALENDAR, $course_info['dbName']);
    $t_cal_repeat = Database::get_course_table(TABLE_AGENDA_REPEAT, $course_info['dbName']);
    $t_ip = Database::get_course_table(TABLE_ITEM_PROPERTY, $course_info['dbName']);
    $sql = "SELECT c.id, c.title, c.content, ".
        " UNIX_TIMESTAMP(c.start_date) as orig_start, UNIX_TIMESTAMP(c.end_date) as orig_end, ".
        " cr.cal_type, cr.cal_end ".
        " FROM $t_cal c, $t_cal_repeat cr, $t_ip as item_property ".
        " WHERE cr.cal_end >= $start ".
        " AND cr.cal_id = c.id ".
        " AND item_property.ref = c.id ".
        " AND item_property.tool = '".TOOL_CALENDAR_EVENT."' ".
        " AND c.start_date <= '$db_start' "
        .(!empty($params['conditions']) ? $params['conditions'] : '')
        .(!empty($params['groupby']) ? ' GROUP BY '.$params['groupby'] : '')
        .(!empty($params['orderby']) ? ' ORDER BY '.$params['orderby'] : '');
    $res = Database::query($sql);
    if (Database::num_rows($res) > 0) {
        while ($row = Database::fetch_array($res)) {
            $orig_start = $row['orig_start'];
            $orig_end = $row['orig_start'];
            $repeat_type = $row['cal_type'];
            switch ($repeat_type) {
                case 'daily':
                    //we are in the daily view, so if this element is repeated daily and
                    //the repetition is still active today (which is a condition of the SQL query)
                    //then the event happens today. Just build today's timestamp for start and end
                    $time_orig_h = date('H', $orig_start);
                    $time_orig_m = date('i', $orig_start);
                    $time_orig_s = date('s', $orig_start);
                    $int_time = (($time_orig_h * 60) + $time_orig_m) * 60 + $time_orig_s; //time in seconds since 00:00:00
                    $span = $orig_end - $orig_start; //total seconds between start and stop of original event
                    $current_start = $start + $int_time; //unixtimestamp start of today's event
                    $current_stop = $start + $int_time + $span; //unixtimestamp stop of today's event
                    $events[] = array(
                        $course_info['id'],
                        $row['id'],
                        $current_start,
                        $current_stop,
                        $row['title'],
                        $row['content']
                    );
                    break;
                case 'weekly':
                    $time_orig = date('Y/n/W/j/N/G/i/s', $orig_start);
                    list($y_orig, $m_orig, $w_orig, $d_orig, $dw_orig, $h_orig, $n_orig, $s_orig) = split(
                        '/',
                        $time_orig
                    );
                    $time_now = date('Y/n/W/j/N/G/i/s', $end);
                    list($y_now, $m_now, $w_now, $d_now, $dw_now, $h_now, $n_now, $s_now) = split('/', $time_now);
                    if ((($y_now > $y_orig) OR (($y_now == $y_orig) && ($w_now > $w_orig))) && ($dw_orig == $dw_now)) { //if the event is after the original (at least one week) and the day of the week is the same
                        $time_orig_end = date('Y/n/W/j/N/G/i/s', $orig_end);
                        list($y_orig_e, $m_orig_e, $w_orig_e, $d_orig_e, $dw_orig_e, $h_orig_e, $n_orig_e, $s_orig_e) = split(
                            '/',
                            $time_orig_end
                        );
                        $events[] = array(
                            $course_info['id'],
                            $row['id'],
                            mktime($h_orig, $n_orig, $s_orig, $m_now, $d_orig, $y_now),
                            mktime($h_orig_e, $n_orig_e, $s_orig_e, $m_now, $d_orig_e, $y_now),
                            $row['title'],
                            $row['content']
                        );
                    }
                    break;
                case 'monthlyByDate':
                    $time_orig = date('Y/n/j/G/i/s', $orig_start);
                    list($y_orig, $m_orig, $d_orig, $h_orig, $n_orig, $s_orig) = split('/', $time_orig);
                    $time_now = date('Y/n/j/G/i/s', $end);
                    list($y_now, $m_now, $d_now, $h_now, $n_now, $s_now) = split('/', $time_now);
                    if ((($y_now > $y_orig) OR (($y_now == $y_orig) && ($m_now > $m_orig))) && ($d_orig == $d_now)) {
                        $time_orig_end = date('Y/n/j/G/i/s', $orig_end);
                        list($y_orig_e, $m_orig_e, $d_orig_e, $h_orig_e, $n_orig_e, $s_orig_e) = split(
                            '/',
                            $time_orig_end
                        );
                        $events[] = array(
                            $course_info['id'],
                            $row['id'],
                            mktime($h_orig, $n_orig, $s_orig, $m_now, $d_orig, $y_now),
                            mktime($h_orig_e, $n_orig_e, $s_orig_e, $m_now, $d_orig_e, $y_now),
                            $row['title'],
                            $row['content']
                        );
                    }
                    break;
                case 'monthlyByDayR':
                    //not implemented yet
                    break;
                case 'monthlyByDay':
                    //not implemented yet
                    break;
                case 'yearly':
                    $time_orig = date('Y/n/j/z/G/i/s', $orig_start);
                    list($y_orig, $m_orig, $d_orig, $dy_orig, $h_orig, $n_orig, $s_orig) = split('/', $time_orig);
                    $time_now = date('Y/n/j/z/G/i/s', $end);
                    list($y_now, $m_now, $d_now, $dy_now, $h_now, $n_now, $s_now) = split('/', $time_now);
                    if (($y_now > $y_orig) && ($dy_orig == $dy_now)) {
                        $time_orig_end = date('Y/n/j/G/i/s', $orig_end);
                        list($y_orig_e, $m_orig_e, $d_orig_e, $dy_orig_e, $h_orig_e, $n_orig_e, $s_orig_e) = split(
                            '/',
                            $time_orig_end
                        );
                        $events[] = array(
                            $course_info['id'],
                            $row['id'],
                            mktime($h_orig, $n_orig, $s_orig, $m_now, $d_orig, $y_now),
                            mktime($h_orig_e, $n_orig_e, $s_orig_e, $m_now, $d_orig_e, $y_now),
                            $row['title'],
                            $row['content']
                        );
                    }
                    break;
                default:
                    break;
            }
        }
    }

    return $events;
}

/**
 * Get repeated events of a course between two dates (timespan of a week).
 * Returns an array containing the events
 * @param    string    Course info array (as returned by api_get_course_info())
 * @param    int        UNIX timestamp of span start. Defaults 0, later transformed into today's start
 * @param    int        UNIX timestamp. Defaults to 0, later transformed into today's end
 * @param   array   A set of parameters to alter the SQL query
 * @return    array    [int] => [course_id,parent_event_id,start_date,end_date,title,description]
 */
function get_repeated_events_week_view($course_info, $start = 0, $end = 0, $params)
{
    $events = array();
    //block $end if higher than 2038 -- PHP doesn't go past that
    if ($end > 2145934800) {
        $end = 2145934800;
    }
    //initialise all values
    $y = 0;
    $m = 0;
    $d = 0;
    if ($start == 0 or $end == 0) {
        $time = time();
        $dw = date('w', $time);
        $week_start = $time - (($dw - 1) * 86400);
        $y = date('Y', $week_start);
        $m = date('m', $week_start);
        $d = date('j', $week_start);
        $w = date('W', $week_start);
    }
    if ($start == 0) {
        $start = mktime(0, 0, 0, $m, $d, $y);
    }
    $db_start = date('Y-m-d H:i:s', $start);
    if ($end == 0) {
        $end = $start + (86400 * 7) - 1; //start of week, more 7 days, minus 1 second to get back to the previoyus day
    }
    //$db_end = date('Y-m-d H:i:s',$end);

    $t_cal = Database::get_main_table(TABLE_MAIN_SYSTEM_CALENDAR);
    //$t_cal_repeat = Database::get_course_table(TABLE_AGENDA_REPEAT,$course_info['dbName']);
    //$t_ip = Database::get_course_table(TABLE_ITEM_PROPERTY,$course_info['dbName']);
    $sql = "SELECT c.id, c.title, c.content, ".
        " UNIX_TIMESTAMP(c.start_date) as orig_start, UNIX_TIMESTAMP(c.end_date) as orig_end ".
        " FROM ".$t_cal."
             AS c WHERE c.start_date <= '$db_start' "
        .(!empty($params['conditions']) ? $params['conditions'] : '')
        .(!empty($params['groupby']) ? ' GROUP BY '.$params['groupby'] : '')
        .(!empty($params['orderby']) ? ' ORDER BY '.$params['orderby'] : '');
    $res = Database::query($sql);
    if (Database::num_rows($res) > 0) {
        while ($row = Database::fetch_array($res)) {
            $orig_start = $row['orig_start'];
            $orig_end = $row['orig_end'];
            $repeat_type = $row['cal_type'];
            switch ($repeat_type) {
                case 'daily':
                    $time_orig_h = date('H', $orig_start);
                    $time_orig_m = date('i', $orig_start);
                    $time_orig_s = date('s', $orig_start);
                    $int_time = (($time_orig_h * 60) + $time_orig_m) * 60 + $time_orig_s; //time in seconds since 00:00:00
                    $span = $orig_end - $orig_start; //total seconds between start and stop of original event
                    for ($i = 0; $i < 7; $i++) {
                        $current_start = $start + ($i * 86400) + $int_time; //unixtimestamp start of today's event
                        $current_stop = $start + ($i * 86400) + $int_time + $span; //unixtimestamp stop of today's event
                        $events[] = array(
                            $course_info['id'],
                            $row['id'],
                            $current_start,
                            $current_stop,
                            $row['title'],
                            $row['content']
                        );
                    }
                    break;
                case 'weekly':
                    $time_orig = date('Y/n/W/j/N/G/i/s', $orig_start);
                    list($y_orig, $m_orig, $w_orig, $d_orig, $dw_orig, $h_orig, $n_orig, $s_orig) = split(
                        '/',
                        $time_orig
                    );
                    $time_now = date('Y/n/W/j/N/G/i/s', $end);
                    list($y_now, $m_now, $w_now, $d_now, $dw_now, $h_now, $n_now, $s_now) = split('/', $time_now);
                    if ((($y_now > $y_orig) OR (($y_now == $y_orig) && ($w_now > $w_orig)))) { //if the event is after the original (at least one week) and the day of the week is the same
                        $time_orig_end = date('Y/n/W/j/N/G/i/s', $orig_end);
                        list($y_orig_e, $m_orig_e, $w_orig_e, $d_orig_e, $dw_orig_e, $h_orig_e, $n_orig_e, $s_orig_e) = split(
                            '/',
                            $time_orig_end
                        );
                        $events[] = array(
                            $course_info['id'],
                            $row['id'],
                            mktime($h_orig, $n_orig, $s_orig, $m_now, $d_orig, $y_now),
                            mktime($h_orig_e, $n_orig_e, $s_orig_e, $m_now, $d_orig_e, $y_now),
                            $row['title'],
                            $row['content']
                        );
                    }
                    break;
                case 'monthlyByDate':
                    $time_orig = date('Y/n/W/j/G/i/s', $orig_start);
                    list($y_orig, $m_orig, $w_orig, $d_orig, $h_orig, $n_orig, $s_orig) = split('/', $time_orig);
                    $time_now = date('Y/n/W/j/G/i/s', $end);
                    list($y_now, $m_now, $w_now, $d_now, $h_now, $n_now, $s_now) = split('/', $time_now);
                    $event_repetition_time = mktime($h_orig, $n_orig, $s_orig, $m_now, $d_orig, $y_now);
                    if ((($y_now > $y_orig) OR (($y_now == $y_orig) && ($m_now > $m_orig))) && ($start < $event_repetition_time && $event_repetition_time < $end)) { //if the event is after the original (at least one month) and the original event's day is between the first day of the week and the last day of the week
                        $time_orig_end = date('Y/n/j/G/i/s', $orig_end);
                        list($y_orig_e, $m_orig_e, $d_orig_e, $h_orig_e, $n_orig_e, $s_orig_e) = split(
                            '/',
                            $time_orig_end
                        );
                        $events[] = array(
                            $course_info['id'],
                            $row['id'],
                            mktime($h_orig, $n_orig, $s_orig, $m_now, $d_orig, $y_now),
                            mktime($h_orig_e, $n_orig_e, $s_orig_e, $m_now, $d_orig_e, $y_now),
                            $row['title'],
                            $row['content']
                        );
                    }
                    break;
                case 'monthlyByDayR':
                    //not implemented yet
                    break;
                case 'monthlyByDay':
                    //not implemented yet
                    break;
                case 'yearly':
                    $time_orig = date('Y/n/j/z/G/i/s', $orig_start);
                    list($y_orig, $m_orig, $d_orig, $dy_orig, $h_orig, $n_orig, $s_orig) = split('/', $time_orig);
                    $time_now = date('Y/n/j/z/G/i/s', $end);
                    list($y_now, $m_now, $d_now, $dy_now, $h_now, $n_now, $s_now) = split('/', $time_now);
                    $event_repetition_time = mktime($h_orig, $n_orig, $s_orig, $m_orig, $d_orig, $y_now);
                    if ((($y_now > $y_orig) && ($start < $event_repetition_time && $event_repetition_time < $end))) {
                        $time_orig_end = date('Y/n/j/G/i/s', $orig_end);
                        list($y_orig_e, $m_orig_e, $d_orig_e, $dy_orig_e, $h_orig_e, $n_orig_e, $s_orig_e) = split(
                            '/',
                            $time_orig_end
                        );
                        $events[] = array(
                            $course_info['id'],
                            $row['id'],
                            mktime($h_orig, $n_orig, $s_orig, $m_now, $d_orig, $y_now),
                            mktime($h_orig_e, $n_orig_e, $s_orig_e, $m_now, $d_orig_e, $y_now),
                            $row['title'],
                            $row['content']
                        );
                    }
                    break;
                default:
                    break;
            }
        }
    }

    return $events;
}

/**
 * Get repeated events of a course between two dates (timespan of a month).
 * Returns an array containing the events
 * @param   string  Course info array (as returned by api_get_course_info())
 * @param    int        UNIX timestamp of span start. Defaults 0, later transformed into today's start
 * @param    int        UNIX timestamp. Defaults to 0, later transformed into today's end
 * @param   array   A set of parameters to alter the SQL query
 * @return    array    [int] => [course_id,parent_event_id,start_date,end_date,title,description]
 */
function get_repeated_events_month_view($course_info, $start = 0, $end = 0, $params)
{
    $events = array();
    //block $end if higher than 2038 -- PHP doesn't go past that
    if ($end > 2145934800) {
        $end = 2145934800;
    }
    //initialise all values
    $y = 0;
    $m = 0;
    $d = 0;
    if ($start == 0 or $end == 0) {
        $time = time();
        $y = date('Y');
        $m = date('m');
    }
    if ($start == 0) {
        $start = mktime(0, 0, 0, $m, 1, $y);
    }
    $db_start = date('Y-m-d H:i:s', $start);
    if ($end == 0) {
        if ($m == 12) {
            $end = mktime(
                0,
                0,
                0,
                1,
                1,
                $y + 1
            ) - 1; //start of next month, minus 1 second to get back to the previoyus day
        } else {
            $end = mktime(0, 0, 0, $m + 1, 1, $y) - 1;
        }
    }
    //$db_end = date('Y-m-d H:i:s',$end);

    $t_cal = Database::get_main_table(TABLE_MAIN_SYSTEM_CALENDAR);
    $t_cal_repeat = Database::get_course_table(TABLE_AGENDA_REPEAT, $course_info['dbName']);
    $t_ip = Database::get_course_table(TABLE_ITEM_PROPERTY, $course_info['dbName']);
    $sql = "SELECT c.id, c.title, c.content, ".
        " UNIX_TIMESTAMP(c.start_date) as orig_start, UNIX_TIMESTAMP(c.end_date) as orig_end, ".
        " cr.cal_type, cr.cal_end ".
        " FROM $t_cal c, $t_cal_repeat cr, $t_ip as item_property ".
        " WHERE cr.cal_end >= $start ".
        " AND cr.cal_id = c.id ".
        " AND item_property.ref = c.id ".
        " AND item_property.tool = '".TOOL_CALENDAR_EVENT."' ".
        " AND c.start_date <= '$db_start' "
        .(!empty($params['conditions']) ? $params['conditions'] : '')
        .(!empty($params['groupby']) ? ' GROUP BY '.$params['groupby'] : '')
        .(!empty($params['orderby']) ? ' ORDER BY '.$params['orderby'] : '');
    $res = Database::query($sql);
    if (Database::num_rows($res) > 0) {
        while ($row = Database::fetch_array($res)) {
            $orig_start = $row['orig_start'];
            $orig_end = $row['orig_end'];
            $repeat_type = $row['cal_type'];
            switch ($repeat_type) {
                case 'daily':
                    $time_orig_h = date('H', $orig_start);
                    $time_orig_m = date('i', $orig_start);
                    $time_orig_s = date('s', $orig_start);
                    $month_last_day = date('d', $end);
                    $int_time = (($time_orig_h * 60) + $time_orig_m) * 60 + $time_orig_s; //time in seconds since 00:00:00
                    $span = $orig_end - $orig_start; //total seconds between start and stop of original event
                    for ($i = 0; $i < $month_last_day; $i++) {
                        $current_start = $start + ($i * 86400) + $int_time; //unixtimestamp start of today's event
                        $current_stop = $start + ($i * 86400) + $int_time + $span; //unixtimestamp stop of today's event
                        $events[] = array(
                            $course_info['id'],
                            $row['id'],
                            $current_start,
                            $current_stop,
                            $row['title'],
                            $row['content']
                        );
                    }
                    break;
                case 'weekly':
                    //A weekly repeated event is very difficult to catch in a month view,
                    //because weeks start before or at the same time as the first day of the month
                    //The same can be said for the end of the month.
                    // The idea is thus to get all possible events by enlarging the scope of
                    // the month to get complete weeks covering the complete month, and then take out
                    // the events that start before the 1st ($start) or after the last day of the month ($end)
                    $time_orig = date('Y/n/W/j/N/G/i/s', $orig_start);
                    list($y_orig, $m_orig, $w_orig, $d_orig, $dw_orig, $h_orig, $n_orig, $s_orig) = split(
                        '/',
                        $time_orig
                    );
                    $time_orig_end = date('Y/n/W/j/N/G/i/s', $orig_end);
                    list($y_orig_e, $m_orig_e, $w_orig_e, $d_orig_e, $dw_orig_e, $h_orig_e, $n_orig_e, $s_orig_e) = split(
                        '/',
                        $time_orig_end
                    );

                    $time_now = date('Y/n/W/j/N/G/i/s', $end);
                    list($y_now, $m_now, $w_now, $d_now, $dw_now, $h_now, $n_now, $s_now) = split('/', $time_now);

                    $month_first_week = date('W', $start);
                    $month_last_week = date('W', $end);

                    if (($y_now > $y_orig) OR (($y_now == $y_orig) && ($w_now > $w_orig))) { //if the event is after the original (at least one week) and the day of the week is the same
                        for ($i = $month_first_week; $i <= $month_last_week; $i++) {
                            //the "day of the week" of repetition is the same as the $dw_orig,
                            //so to get the "day of the month" from the "day of the week", we have
                            //to get the first "day of the week" for this week and add the number
                            //of days (in seconds) to reach the $dw_orig
                            //example: the first week spans between the 28th of April (Monday) to the
                            // 4th of May (Sunday). The event occurs on the 2nd day of each week.
                            // This means the event occurs on 29/4, 6/5, 13/5, 20/5 and 27/5.
                            // We want to get all of these, and then reject 29/4 because it is out
                            // of the month itself.

                            //First, to get the start time of the first day of the month view (even if
                            // the day is from the past month), we get the month start date (1/5) and
                            // see which day of the week it is, and subtract the number of days necessary
                            // to get back to the first day of the week.
                            $month_first_day_weekday = date('N', $start);
                            $first_week_start = $start - (($month_first_day_weekday - 1) * 86400);

                            //Second, we add the week day of the original event, so that we have an
                            // absolute time that represents the first repetition of the event in
                            // our 4- or 5-weeks timespan
                            $first_event_repeat_start = $first_week_start + (($dw_orig - 1) * 86400) + ($h_orig * 3600) + ($n_orig * 60) + $s_orig;

                            //Third, we start looping through the repetitions and see if they are between
                            // $start and $end
                            for ($i = $first_event_repeat_start; $i <= $end; $i += 604800) {
                                if ($start < $i && $i < $end) {
                                    list($y_repeat, $m_repeat, $d_repeat, $h_repeat, $n_repeat, $s_repeat) = split(
                                        '/',
                                        date('Y/m/j/H/i/s', $i)
                                    );
                                    $events[] = array(
                                        $course_info['id'],
                                        $row['id'],
                                        mktime($h_orig, $n_orig, $s_orig, $m_now, $d_orig, $y_now),
                                        mktime($h_orig_e, $n_orig_e, $s_orig_e, $m_now, $d_orig_e, $y_now),
                                        $row['title'],
                                        $row['content']
                                    );
                                }
                            }
                        }
                    }
                    break;
                case 'monthlyByDate':
                    $time_orig = date('Y/n/W/j/G/i/s', $orig_start);
                    list($y_orig, $m_orig, $w_orig, $d_orig, $h_orig, $n_orig, $s_orig) = split('/', $time_orig);
                    $time_now = date('Y/n/W/j/G/i/s', $end);
                    list($y_now, $m_now, $w_now, $d_now, $h_now, $n_now, $s_now) = split('/', $time_now);
                    $event_repetition_time = mktime($h_orig, $n_orig, $s_orig, $m_now, $d_orig, $y_now);
                    if (($y_now > $y_orig) OR (($y_now == $y_orig) && ($m_now > $m_orig))) { //if the event is after the original (at least one month) and the original event's day is between the first day of the week and the last day of the week
                        $time_orig_end = date('Y/n/j/G/i/s', $orig_end);
                        list($y_orig_e, $m_orig_e, $d_orig_e, $h_orig_e, $n_orig_e, $s_orig_e) = split(
                            '/',
                            $time_orig_end
                        );
                        $events[] = array(
                            $course_info['id'],
                            $row['id'],
                            mktime($h_orig, $n_orig, $s_orig, $m_now, $d_orig, $y_now),
                            mktime($h_orig_e, $n_orig_e, $s_orig_e, $m_now, $d_orig_e, $y_now),
                            $row['title'],
                            $row['content']
                        );
                    }
                    break;
                case 'monthlyByDayR':
                    //not implemented yet
                    break;
                case 'monthlyByDay':
                    //not implemented yet
                    break;
                case 'yearly':
                    $time_orig = date('Y/n/j/z/G/i/s', $orig_start);
                    list($y_orig, $m_orig, $d_orig, $dy_orig, $h_orig, $n_orig, $s_orig) = split('/', $time_orig);
                    $time_now = date('Y/n/j/z/G/i/s', $end);
                    list($y_now, $m_now, $d_now, $dy_now, $h_now, $n_now, $s_now) = split('/', $time_now);
                    $event_repetition_time = mktime($h_orig, $n_orig, $s_orig, $m_orig, $d_orig, $y_now);
                    if ((($y_now > $y_orig) && ($start < $event_repetition_time && $event_repetition_time < $end))) {
                        $time_orig_end = date('Y/n/j/G/i/s', $orig_end);
                        list($y_orig_e, $m_orig_e, $d_orig_e, $dy_orig_e, $h_orig_e, $n_orig_e, $s_orig_e) = split(
                            '/',
                            $time_orig_end
                        );
                        $events[] = array(
                            $course_info['id'],
                            $row['id'],
                            mktime($h_orig, $n_orig, $s_orig, $m_now, $d_orig, $y_now),
                            mktime($h_orig_e, $n_orig_e, $s_orig_e, $m_now, $d_orig_e, $y_now),
                            $row['title'],
                            $row['content']
                        );
                    }
                    break;
                default:
                    break;
            }
        }
    }

    return $events;
}

/**
 * Get repeated events of a course between two dates (1 year timespan). Used for the list display.
 * This is virtually unlimited but by default it shortens to 100 years from now (even a birthday shouldn't be useful more than this time - except for turtles)
 * Returns an array containing the events
 * @param   string  Course info array (as returned by api_get_course_info())
 * @param   int     UNIX timestamp of span start. Defaults 0, later transformed into today's start
 * @param   int     UNIX timestamp. Defaults to 0, later transformed into today's end
 * @param   array   A set of parameters to alter the SQL query
 * @return  array   [int] => [course_id,parent_event_id,start_date,end_date,title,description]
 */
function get_repeated_events_list_view($course_info, $start = 0, $end = 0, $params)
{
    $events = array();
    //block $end if higher than 2038 -- PHP doesn't go past that
    if ($end > 2145934800) {
        $end = 2145934800;
    }
    //initialise all values
    $y = 0;
    $m = 0;
    $d = 0;
    if (empty($start) or empty($end)) {
        $time = time();
        $y = date('Y');
        $m = date('m');
    }
    if (empty($start)) {
        $start = mktime(0, 0, 0, $m, 1, $y);
    }
    $db_start = date('Y-m-d H:i:s', $start);
    if (empty($end)) {
        $end = mktime(0, 0, 0, 1, 1, 2037);
    }
    //$db_end = date('Y-m-d H:i:s',$end);

    $t_cal = Database::get_main_table(TABLE_MAIN_SYSTEM_CALENDAR, $course_info['dbName']);
    $t_cal_repeat = Database::get_course_table(TABLE_AGENDA_REPEAT, $course_info['dbName']);
    $t_ip = Database::get_course_table(TABLE_ITEM_PROPERTY, $course_info['dbName']);
    $sql = "SELECT c.id, c.title, c.content, ".
        " UNIX_TIMESTAMP(c.start_date) as orig_start, UNIX_TIMESTAMP(c.end_date) as orig_end, ".
        " cr.cal_type, cr.cal_end ".
        " FROM $t_cal c, $t_cal_repeat cr, $t_ip as item_property ".
        " WHERE cr.cal_end >= $start ".
        " AND cr.cal_id = c.id ".
        " AND item_property.ref = c.id ".
        " AND item_property.tool = '".TOOL_CALENDAR_EVENT."' ".
        " AND c.start_date <= '$db_start' "
        .(!empty($params['conditions']) ? $params['conditions'] : '')
        .(!empty($params['groupby']) ? ' GROUP BY '.$params['groupby'] : '')
        .(!empty($params['orderby']) ? ' ORDER BY '.$params['orderby'] : '');
    $res = Database::query($sql);
    if (Database::num_rows($res) > 0) {
        while ($row = Database::fetch_array($res)) {
            $orig_start = $row['orig_start'];
            $orig_end = $row['orig_end'];
            $repeat_type = $row['cal_type'];
            $repeat_end = $row['cal_end'];
            switch ($repeat_type) {
                case 'daily':
                    $time_orig_h = date('H', $orig_start);
                    $time_orig_m = date('i', $orig_start);
                    $time_orig_s = date('s', $orig_start);
                    $span = $orig_end - $orig_start; //total seconds between start and stop of original event
                    for ($i = $orig_start + 86400; ($i < $end && $i <= $repeat_end); $i += 86400) {
                        $current_start = $i; //unixtimestamp start of today's event
                        $current_stop = $i + $span; //unixtimestamp stop of today's event
                        $events[] = array(
                            $course_info['id'],
                            $row['id'],
                            $current_start,
                            $current_stop,
                            $row['title'],
                            $row['content']
                        );
                    }
                    break;
                case 'weekly':
                    //A weekly repeated event is very difficult to catch in a month view,
                    // because weeks start before or at the same time as the first day of the month
                    //The same can be said for the end of the month.
                    // The idea is thus to get all possible events by enlarging the scope of
                    // the month to get complete weeks covering the complete month, and then take out
                    // the events that start before the 1st ($start) or after the last day of the month ($end)
                    $time_orig = date('Y/n/W/j/N/G/i/s', $orig_start);
                    list($y_orig, $m_orig, $w_orig, $d_orig, $dw_orig, $h_orig, $n_orig, $s_orig) = split(
                        '/',
                        $time_orig
                    );
                    $time_orig_end = date('Y/n/W/j/N/G/i/s', $orig_end);
                    list($y_orig_e, $m_orig_e, $w_orig_e, $d_orig_e, $dw_orig_e, $h_orig_e, $n_orig_e, $s_orig_e) = split(
                        '/',
                        $time_orig_end
                    );

                    $time_now = date('Y/n/W/j/N/G/i/s', $end);
                    list($y_now, $m_now, $w_now, $d_now, $dw_now, $h_now, $n_now, $s_now) = split('/', $time_now);
                    if ($w_now == 52) {
                        ++$y_now;
                        $w_now = 1;
                    } else {
                        ++$w_now;
                    }
                    $month_first_week = date('W', $start);
                    $total_weeks = ((date('Y', $end) - $y_orig) - 1) * 52;
                    $month_last_week = $month_first_week + $total_weeks;

                    if (($y_now > $y_orig) OR (($y_now == $y_orig) && ($w_now > $w_orig))) { //if the event is after the original (at least one week) and the day of the week is the same
                        //for($i=$month_first_week;($i<=$month_last_week && $i<1000);$i++)
                        //{


                        /*
                           The "day of the week" of repetition is the same as the $dw_orig,
                           so to get the "day of the month" from the "day of the week", we have
                           to get the first "day of the week" for this week and add the number
                           of days (in seconds) to reach the $dw_orig
                          example: the first week spans between the 28th of April (Monday) to the
                           4th of May (Sunday). The event occurs on the 2nd day of each week.
                           This means the event occurs on 29/4, 6/5, 13/5, 20/5 and 27/5.
                           We want to get all of these, and then reject 29/4 because it is out
                           of the month itself.
                          First, to get the start time of the first day of the month view (even if
                           the day is from the past month), we get the month start date (1/5) and
                           see which day of the week it is, and subtract the number of days necessary
                           to get back to the first day of the week.
                          */
                        $month_first_day_weekday = date('N', $start);
                        $first_week_start = $start - (($month_first_day_weekday - 1) * 86400);

                        //Second, we add the week day of the original event, so that we have an
                        // absolute time that represents the first repetition of the event in
                        // our 4- or 5-weeks timespan
                        $first_event_repeat_start = $first_week_start + (($dw_orig - 1) * 86400) + ($h_orig * 3600) + ($n_orig * 60) + $s_orig;

                        //Third, we start looping through the repetitions and see if they are between
                        // $start and $end
                        for ($i = $first_event_repeat_start; ($i <= $end && $i <= $repeat_end); $i += 604800) {
                            if ($start < $i && $i <= $end && $i <= $repeat_end) {
                                list($y_repeat, $m_repeat, $d_repeat, $h_repeat, $n_repeat, $s_repeat) = split(
                                    '/',
                                    date('Y/m/j/H/i/s', $i)
                                );
                                $new_start_time = mktime($h_orig, $n_orig, $s_orig, $m_now, $d_orig, $y_now);
                                $new_stop_time = mktime($h_orig_e, $n_orig_e, $s_orig_e, $m_now, $d_orig_e, $y_now);
                                $events[] = array(
                                    $course_info['id'],
                                    $row['id'],
                                    $new_start_time,
                                    $new_stop_time,
                                    $row['title'],
                                    $row['content']
                                );
                            }
                            $time_now = date('Y/n/W/j/N/G/i/s', $i + 604800);
                            list($y_now, $m_now, $w_now, $d_now, $dw_now, $h_now, $n_now, $s_now) = split(
                                '/',
                                $time_now
                            );
                        }
                        //}
                    }
                    break;
                case 'monthlyByDate':
                    $time_orig = date('Y/n/W/j/G/i/s', $orig_start);
                    list($y_orig, $m_orig, $w_orig, $d_orig, $h_orig, $n_orig, $s_orig) = split('/', $time_orig);

                    $time_now = date('Y/n/W/j/G/i/s', $start);
                    list($y_now, $m_now, $w_now, $d_now, $h_now, $n_now, $s_now) = split('/', $time_now);
                    //make sure we are one month ahead (to avoid being the same month as the original event)
                    if ($m_now == 12) {
                        ++$y_now;
                        $m_now = 1;
                    } else {
                        ++$m_now;
                    }

                    $time_orig_end = date('Y/n/j/G/i/s', $orig_end);
                    list($y_orig_e, $m_orig_e, $d_orig_e, $h_orig_e, $n_orig_e, $s_orig_e) = split('/', $time_orig_end);

                    $event_repetition_time = mktime($h_orig, $n_orig, $s_orig, $m_now, $d_orig, $y_now);
                    $diff = $orig_end - $orig_start;
                    while ((($y_now > $y_orig) OR (($y_now == $y_orig) && ($m_now > $m_orig))) && ($event_repetition_time < $end) && ($event_repetition_time < $repeat_end)) { //if the event is after the original (at least one month) and the original event's day is between the first day of the week and the last day of the week
                        $new_start_time = mktime($h_orig, $n_orig, $s_orig, $m_now, $d_orig, $y_now);
                        $new_stop_time = mktime($h_orig_e, $n_orig_e, $s_orig_e, $m_now, $d_orig_e, $y_now);
                        $events[] = array(
                            $course_info['id'],
                            $row['id'],
                            $new_start_time,
                            $new_stop_time,
                            $row['title'],
                            $row['content']
                        );
                        if ($m_now == 12) {
                            ++$y_now;
                            $m_now = 1;
                        } else {
                            ++$m_now;
                        }
                        $event_repetition_time = mktime($h_orig, $n_orig, $s_orig, $m_now, $d_orig, $y_now);
                    }
                    break;
                case 'monthlyByDayR':
                    //not implemented yet
                    break;
                case 'monthlyByDay':
                    //not implemented yet
                    break;
                case 'yearly':
                    $time_orig = date('Y/n/j/z/G/i/s', $orig_start);
                    list($y_orig, $m_orig, $d_orig, $dy_orig, $h_orig, $n_orig, $s_orig) = split('/', $time_orig);
                    $time_now = date('Y/n/j/z/G/i/s', $end);
                    list($y_now, $m_now, $d_now, $dy_now, $h_now, $n_now, $s_now) = split('/', $time_now);
                    $event_repetition_time = mktime($h_orig, $n_orig, $s_orig, $m_orig, $d_orig, $y_now);
                    while ((($y_now > $y_orig) && ($start < $event_repetition_time && $event_repetition_time < $end && $event_repetition_time < $repeat_end))) {
                        $time_orig_end = date('Y/n/j/G/i/s', $orig_end);
                        list($y_orig_e, $m_orig_e, $d_orig_e, $dy_orig_e, $h_orig_e, $n_orig_e, $s_orig_e) = split(
                            '/',
                            $time_orig_end
                        );
                        $events[] = array(
                            $course_info['id'],
                            $row['id'],
                            mktime($h_orig, $n_orig, $s_orig, $m_now, $d_orig, $y_now),
                            mktime($h_orig_e, $n_orig_e, $s_orig_e, $m_now, $d_orig_e, $y_now),
                            $row['title'],
                            $row['content']
                        );
                        ++$y_now;
                        $event_repetition_time = mktime($h_orig, $n_orig, $s_orig, $m_orig, $d_orig, $y_now);
                    }
                    break;
                default:
                    break;
            }
        }
    }

    return $events;
}

/**
 * Tells if an agenda item is repeated
 * @param   string  Course database
 * @param   int     The agenda item
 * @return  boolean True if repeated, false otherwise
 */
function is_repeated_event($id, $course = null)
{
    if (empty($course)) {
        $course_info = api_get_course_info();
        $course = $course_info['dbName'];
    }
    $id = (int)$id;
    //$t_agenda_repeat = Database::get_course_table(TABLE_AGENDA_REPEAT,$course);
    $sql = "SELECT * FROM $t_agenda_repeat WHERE cal_id = $id";
    $res = Database::query($sql);
    if (Database::num_rows($res) > 0) {
        return true;
    }

    return false;
}

/**
 * Adds x weeks to a UNIX timestamp
 * @param   int     The timestamp
 * @param   int     The number of weeks to add
 * @return  int     The new timestamp
 */
function add_week($timestamp, $num = 1)
{
    return $timestamp + $num * 604800;
}

/**
 * Adds x months to a UNIX timestamp
 * @param   int     The timestamp
 * @param   int     The number of years to add
 * @return  int     The new timestamp
 */
function add_month($timestamp, $num = 1)
{
    list($y, $m, $d, $h, $n, $s) = split('/', date('Y/m/d/h/i/s', $timestamp));
    if ($m + $num > 12) {
        $y += floor($num / 12);
        $m += $num % 12;
    } else {
        $m += $num;
    }

    return mktime($h, $n, $s, $m, $d, $y);
}

/**
 * Adds x years to a UNIX timestamp
 * @param   int     The timestamp
 * @param   int     The number of years to add
 * @return  int     The new timestamp
 */
function add_year($timestamp, $num = 1)
{
    list($y, $m, $d, $h, $n, $s) = split('/', date('Y/m/d/h/i/s', $timestamp));

    return mktime($h, $n, $s, $m, $d, $y + $num);
}

/**
 * Adds an agenda item in the database. Similar to store_new_agenda_item() except it takes parameters
 * @param   array   Course info
 * @param   string  Event title
 * @param   string  Event content/description
 * @param   string  Start date
 * @param   string  End date
 * @param   array   List of groups to which this event is added
 * @param   int     Parent id (optional)
 * @return  int     The new item's DB ID
 */
function agenda_add_item($title, $content, $db_start_date, $db_end_date)
{
    $user_id = api_get_user_id();
    $t_agenda = Database::get_main_table(TABLE_MAIN_SYSTEM_CALENDAR);

    // some filtering of the input data
    $title = Database::escape_string($title); // no html allowed in the title
    $content = Database::escape_string($content);

    $db_start_date = api_get_utc_datetime($db_start_date);
    $start_date = Database::escape_string($db_start_date);

    $db_end_date = api_get_utc_datetime($db_end_date);
    $end_date = Database::escape_string($db_end_date);

    // check if exists in calendar_event table
    $sql = "SELECT * FROM $t_agenda WHERE title='$title' AND content = '$content' AND start_date = '$start_date' AND end_date = '$end_date' ";
    $result = Database::query($sql);
    $count = Database::num_rows($result);
    if ($count > 0) {
        return false;
    }
    $sql = "INSERT INTO $t_agenda (title,content, start_date, end_date, access_url_id)
			VALUES ('".$title."','".$content."', '".$start_date."','".$end_date."', '".api_get_current_access_url_id(
    )."')";

    $result = Database::query($sql);
    $last_id = Database::insert_id();

    return $last_id;
}

/**
 * Adds a repetitive item to the database
 * @param   array   Course info
 * @param   int     The original event's id
 * @param   string  Type of repetition
 * @param   int     Timestamp of end of repetition (repeating until that date)
 * @param   array   Original event's destination
 * @return  boolean False if error, True otherwise
 */
function get_calendar_items($month, $year)
{
    global $_user, $_course;
    global $is_allowed_to_edit;

    $month = Database::escape_string($month);
    $year = Database::escape_string($year);

    // database variables
    $TABLEAGENDA = Database::get_main_table(TABLE_MAIN_SYSTEM_CALENDAR);
    //$TABLE_ITEM_PROPERTY=Database::get_course_table(TABLE_ITEM_PROPERTY);

    $month_first_day = mktime(0, 0, 0, $month, 1, $year);
    $month_last_day = mktime(0, 0, 0, $month + 1, 1, $year) - 1;
    if ($month == 12) {
        $month_last_day = mktime(0, 0, 0, 1, 1, $year + 1) - 1;
    }
    $repeats = array();
    $data = array();
    if (api_is_allowed_to_edit()) {
        $sql = "SELECT DISTINCT *
			FROM ".$TABLEAGENDA." agenda
			WHERE MONTH(start_date)='".$month."' AND YEAR(start_date)='".$year."'";

        global $_configuration;
        $current_access_url_id = 1;
        if ($_configuration['multiple_access_urls']) {
            $current_access_url_id = api_get_current_access_url_id();
        }
        $sql .= " AND access_url_id = '$current_access_url_id' ";

        $sql .= "GROUP BY id ORDER BY  start_date ";

        $result = Database::query($sql);

        while ($row = Database::fetch_array($result)) {
            $datum_item = (int)substr($row["start_date"], 8, 2);
            $data[$datum_item][intval($datum_item)][] = $row;
        }
    }

    return $data;
}

/**
 * This function is not been used or deprecated
 */
function agenda_add_repeat_item($course_info, $orig_id, $type, $end, $orig_dest)
{ /*
	$t_agenda   = Database::get_main_table(TABLE_MAIN_SYSTEM_CALENDAR,$course_info['dbName']);
   // $t_agenda_r = Database::get_course_table(TABLE_AGENDA_REPEAT,$course_info['dbName']);
    //$sql = "SELECT title, content, UNIX_TIMESTAMP(start_date) as sd, UNIX_TIMESTAMP(end_date) as ed FROM $t_agenda WHERE id = $orig_id";
    $sql = "SELECT title, content, start_date as sd, end_date as ed FROM $t_agenda WHERE id = $orig_id";
    $res = Database::query($sql);
    if(Database::num_rows($res)!==1){return false;}
    $row = Database::fetch_array($res);
    //$orig_start = $row['sd'];
    $orig_start = mktime(substr($row['sd'],11,2),substr($row['sd'],14,2),substr($row['sd'],17,2),substr($row['sd'],5,2),substr($row['sd'],8,2),substr($row['sd'],0,4));
    //$orig_end   = $row['ed'];
    $orig_end   = mktime(substr($row['ed'],11,2),substr($row['ed'],14,2),substr($row['ed'],17,2),substr($row['ed'],5,2),substr($row['ed'],8,2),substr($row['ed'],0,4));
    $diff = $orig_end - $orig_start;
    $orig_title = $row['title'];
    $orig_content = $row['content'];
    $now = time();
    $type = Database::escape_string($type);
    $end = (int) $end;
    if(1<=$end && $end<=500)
    {
    	//we assume that, with this type of value, the user actually gives a count of repetitions
        //and that he wants us to calculate the end date with that (particularly in case of imports from ical)
        switch($type)
        {
            case 'daily':
                $end = $orig_start + (86400*$end);
                break;
            case 'weekly':
                $end = add_week($orig_start,$end);
                break;
            case 'monthlyByDate':
                $end = add_month($orig_start,$end);
                break;
            case 'monthlyByDay':
                //TODO
                break;
            case 'monthlyByDayR':
                //TODO
                break;
            case 'yearly':
                $end = add_year($orig_start,$end);
                break;
        }
    }
    if($end > $now
        && in_array($type,array('daily','weekly','monthlyByDate','monthlyByDay','monthlyByDayR','yearly')))
    {
       $sql = "INSERT INTO $t_agenda_r (cal_id, cal_type, cal_end)" .
            " VALUES ($orig_id,'$type',$end)";
       $res = Database::query($sql);
        switch($type)
        {
            case 'daily':
                for($i = $orig_start + 86400; ($i <= $end); $i += 86400)
                {
                    $res = agenda_add_item($course_info, $orig_title, $orig_content, date('Y-m-d H:i:s', $i), date('Y-m-d H:i:s', $i+$diff), $orig_dest, $orig_id);
                }
                break;
            case 'weekly':
                for($i = $orig_start + 604800; ($i <= $end); $i += 604800)
                {
                    $res = agenda_add_item($course_info, $orig_title, $orig_content, date('Y-m-d H:i:s', $i), date('Y-m-d H:i:s', $i+$diff), $orig_dest, $orig_id);
                }
                break;
            case 'monthlyByDate':
                $next_start = add_month($orig_start);
                while($next_start <= $end)
                {
                    $res = agenda_add_item($course_info, $orig_title, $orig_content, date('Y-m-d H:i:s', $next_start), date('Y-m-d H:i:s', $next_start+$diff), $orig_dest, $orig_id);
                    $next_start = add_month($next_start);
                }
                break;
            case 'monthlyByDay':
                //not yet implemented
                break;
            case 'monthlyByDayR':
                //not yet implemented
                break;
            case 'yearly':
                $next_start = add_year($orig_start);
                while($next_start <= $end)
                {
                    $res = agenda_add_item($course_info, $orig_title, $orig_content, date('Y-m-d H:i:s', $next_start), date('Y-m-d H:i:s', $next_start+$diff), $orig_dest, $orig_id);
                    $next_start = add_year($next_start);
                }
                break;
        }
    }
	return true;*/
}

/**
 * Import an iCal file into the database
 * @param   array   Course info
 * @return  boolean True on success, false otherwise
 */

function agenda_import_ical($course_info, $file)
{
    $charset = api_get_system_encoding();
    $filepath = api_get_path(SYS_ARCHIVE_PATH).$file['name'];
    if (!@move_uploaded_file($file['tmp_name'], $filepath)) {
        error_log('Problem moving uploaded file: '.$file['error'].' in '.__FILE__.' line '.__LINE__);

        return false;
    }
    require_once api_get_path(LIBRARY_PATH).'icalcreator/iCalcreator.class.php';
    $ical = new vcalendar();
    $ical->setConfig('directory', dirname($filepath));
    $ical->setConfig('filename', basename($filepath));
    $ical->parse();
    //we need to recover: summary, description, dtstart, dtend, organizer, attendee, location (=course name),
    // rrule
    $ve = $ical->getComponent(VEVENT);
    //print_r($ve);
    $ttitle = $ve->getProperty('summary');
    //print_r($ttitle);
    $title = api_convert_encoding($ttitle, $charset, 'UTF-8');
    $tdesc = $ve->getProperty('description');
    $desc = api_convert_encoding($tdesc, $charset, 'UTF-8');
    $ts = $ve->getProperty('dtstart');
    $start_date = $ts['year'].'-'.$ts['month'].'-'.$ts['day'].' '.$ts['hour'].':'.$ts['min'].':'.$ts['sec'];
    $ts = $ve->getProperty('dtend');
    $end_date = $ts['year'].'-'.$ts['month'].'-'.$ts['day'].' '.$ts['hour'].':'.$ts['min'].':'.$ts['sec'];
    //echo $start_date.' - '.$end_date;
    $organizer = $ve->getProperty('organizer');
    $attendee = $ve->getProperty('attendee');
    $course_name = $ve->getProperty('location');
    //insert the event in our database
    $id = agenda_add_item($course_info, $title, $desc, $start_date, $end_date, $_POST['selectedform']);

    $repeat = $ve->getProperty('rrule');
    if (is_array($repeat) && !empty($repeat['FREQ'])) {
        $trans = array('DAILY' => 'daily', 'WEEKLY' => 'weekly', 'MONTHLY' => 'monthlyByDate', 'YEARLY' => 'yearly');
        $freq = $trans[$repeat['FREQ']];
        $interval = $repeat['INTERVAL'];
        if (isset($repeat['UNTIL']) && is_array($repeat['UNTIL'])) {
            $until = mktime(23, 59, 59, $repeat['UNTIL']['month'], $repeat['UNTIL']['day'], $repeat['UNTIL']['year']);
            $res = agenda_add_repeat_item($course_info, $id, $freq, $until, $_POST['selectedform']);
        }
        //TODO: deal with count
        if (!empty($repeat['COUNT'])) {
            $count = $repeat['COUNT'];
            $res = agenda_add_repeat_item($course_info, $id, $freq, $count, $_POST['selectedform']);
        }
    }

    return true;
}

?>