<?php
/* For licensing terms, see /license.txt */

/**
 *  @author: Julio Montoya <gugli100@gmail.com> Implementing a real agenda lib
 */
class Agenda
{
    var $events = array();
    var $type = 'personal'; // personal, admin or course

    function __construct()
    {
        //Table definitions
        $this->tbl_global_agenda = Database::get_main_table(TABLE_MAIN_SYSTEM_CALENDAR);
        $this->tbl_personal_agenda = Database::get_user_personal_table(TABLE_PERSONAL_AGENDA);
        $this->tbl_course_agenda = Database::get_course_table(TABLE_AGENDA);

        //Setting the course object if we are in a course
        $this->course = null;
        $course_info = api_get_course_info();
        if (!empty($course_info)) {
            $this->course = $course_info;
        }

        $this->events = array();

        //Event colors
        $this->event_platform_color = 'red'; //red
        $this->event_course_color = '#458B00'; //green
        $this->event_group_color = '#A0522D'; //siena
        $this->event_session_color = '#00496D'; // kind of green
        $this->event_personal_color = 'steel blue'; //steel blue
    }

    function set_course($course_info)
    {
        $this->course = $course_info;
    }

    /**
     *
     * Adds an event to the calendar
     *
     * @param   string  start datetime format: 2012-06-14 09:00:00
     * @param   string  end datetime format: 2012-06-14 09:00:00
     * @param   string  all day (true, false)
     * @param   string  view agendaDay, agendaWeek, month @todo seems not to be used
     * @param   string  title
     * @param   string  content
     * @param   array   users to send array('everyone') or a list of user ids
     * @param   bool    add event as a *course* announcement
     *
     */
    function add_event($start, $end, $all_day, $view, $title, $content, $users_to_send = array(), $add_as_announcement = false)
    {
        $start = api_get_utc_datetime($start);
        $end = api_get_utc_datetime($end);
        $all_day = isset($all_day) && $all_day == 'true' ? 1 : 0;

        $attributes = array();
        $id = null;
        switch ($this->type) {
            case 'personal':
                $attributes['user'] = api_get_user_id();
                $attributes['title'] = $title;
                $attributes['text'] = $content;
                $attributes['date'] = $start;
                $attributes['enddate'] = $end;
                $attributes['all_day'] = $all_day;
                $id = Database::insert($this->tbl_personal_agenda, $attributes);
                break;
            case 'course':
                $attributes['title'] = $title;
                $attributes['content'] = $content;
                $attributes['start_date'] = $start;
                $attributes['end_date'] = $end;
                $attributes['all_day'] = $all_day;
                $attributes['session_id'] = api_get_session_id();
                $attributes['c_id'] = $this->course['real_id'];

                //simple course event
                $id = Database::insert($this->tbl_course_agenda, $attributes);

                if ($id) {
                    $group_id = api_get_group_id();

                    if ((!is_null($users_to_send)) or (!empty($group_id))) {
                        $send_to = self::separate_users_groups($users_to_send);
                        if (isset($send_to['everyone']) && $send_to['everyone']) {
                            api_item_property_update($this->course, TOOL_CALENDAR_EVENT, $id, "AgendaAdded", api_get_user_id(), $group_id, '', $start, $end);
                        } else {
                            // storing the selected groups
                            if (isset($send_to['groups']) && is_array($send_to['groups'])) {
                                foreach ($send_to['groups'] as $group) {
                                    api_item_property_update($this->course, TOOL_CALENDAR_EVENT, $id, "AgendaAdded", api_get_user_id(), $group, 0, $start, $end);
                                }
                            }

                            // storing the selected users
                            if (isset($send_to['groups']) && is_array($send_to['users'])) {
                                foreach ($send_to['users'] as $to_user_id) {
                                    api_item_property_update($this->course, TOOL_CALENDAR_EVENT, $id, "AgendaAdded", api_get_user_id(), $group_id, $to_user_id, $start, $end);
                                }
                            }
                        }
                    }

                    if (isset($add_as_announcement) && !empty($add_as_announcement)) {
                        self::store_agenda_item_as_announcement($id, $users_to_send);
                    }
                }
                break;
            case 'admin':
                if (api_is_platform_admin()) {
                    $attributes['title'] = $title;
                    $attributes['content'] = $content;
                    $attributes['start_date'] = $start;
                    $attributes['end_date'] = $end;
                    $attributes['all_day'] = $all_day;
                    $attributes['access_url_id'] = api_get_current_access_url_id();
                    $id = Database::insert($this->tbl_global_agenda, $attributes);
                }
                break;
        }
        return $id;
    }

    /**
     * @param agenda_id
     * @sent agenda event to
     * */
    function store_agenda_item_as_announcement($item_id, $sent_to = array())
    {
        $table_agenda = Database::get_course_table(TABLE_AGENDA);
        $course_id = api_get_course_int_id();

        //check params
        if (empty($item_id) or $item_id != strval(intval($item_id))) {
            return -1;
        }
        //get the agenda item

        $item_id = Database::escape_string($item_id);
        $sql = "SELECT * FROM $table_agenda WHERE c_id = $course_id AND id = ".$item_id;
        $res = Database::query($sql);

        if (Database::num_rows($res) > 0) {
            $row = Database::fetch_array($res, 'ASSOC');

            //Sending announcement
            if (!empty($sent_to)) {
                $id = AnnouncementManager::add_announcement($row['title'], $row['content'], $sent_to, null, null, $row['end_date']);
                AnnouncementManager::send_email($id);
            }
            return $id;
        }
        return -1;
    }

    /**
     * Edits an event
     *
     * @param int       event id
     * @param string    start datetime format: 2012-06-14 09:00:00
     * @param string    end datetime format: 2012-06-14 09:00:00
     * @param int       event is all day? 1|0
     * @param string    view
     * @param string    event title
     * @param string    event content
     */
    function edit_event($id, $start, $end, $all_day, $view, $title, $content)
    {
        $start = api_get_utc_datetime($start);

        if ($all_day == '0') {
            $end = api_get_utc_datetime($end);
        }
        $all_day = isset($all_day) && $all_day == '1' ? 1 : 0;

        $attributes = array();

        switch ($this->type) {
            case 'personal':
                $eventInfo = $this->get_event($id);
                if ($eventInfo['user'] != api_get_user_id()) {
                    break;
                }
                $attributes['title'] = $title;
                $attributes['text'] = $content;
                $attributes['date'] = $start;
                $attributes['enddate'] = $end;
                Database::update($this->tbl_personal_agenda, $attributes, array('id = ?' => $id));
                break;
            case 'course':
                $course_id = api_get_course_int_id();
                if (!empty($course_id) && api_is_allowed_to_edit(null, true)) {
                    $attributes['title'] = $title;
                    $attributes['content'] = $content;
                    $attributes['start_date'] = $start;
                    $attributes['end_date'] = $end;
                    $attributes['all_day'] = $all_day;
                    Database::update($this->tbl_course_agenda, $attributes, array('id = ? AND c_id = ?' => array($id, $course_id)));
                }
                break;
            case 'admin':
                if (api_is_platform_admin()) {
                    $attributes['title'] = $title;
                    $attributes['content'] = $content;
                    $attributes['start_date'] = $start;
                    $attributes['end_date'] = $end;
                    Database::update($this->tbl_global_agenda, $attributes, array('id = ?' => $id));
                }
                break;
        }
    }

    function delete_event($id)
    {
        switch ($this->type) {
            case 'personal':
                $eventInfo = $this->get_event($id);
                if ($eventInfo['user'] == api_get_user_id()) {
                    Database::delete($this->tbl_personal_agenda, array('id = ?' => $id));
                }
                break;
            case 'course':
                $course_id = api_get_course_int_id();
                if (!empty($course_id) && api_is_allowed_to_edit(null, true)) {
                    Database::delete($this->tbl_course_agenda, array('id = ? AND c_id = ?' => array($id, $course_id)));
                }
                break;
            case 'admin':
                if (api_is_platform_admin()) {
                    Database::delete($this->tbl_global_agenda, array('id = ?' => $id));
                }
                break;
        }
    }

    /**
     *
     * Get agenda events
     * @param	int		start tms
     * @param	int		end tms
     * @param	int		course id *integer* not the course code
     * @param   int     user id
     *
     */
    function get_events($start, $end, $course_id = null, $group_id = null, $user_id = 0)
    {

        switch ($this->type) {
            case 'admin':
                $this->get_platform_events($start, $end);
                break;
            case 'course':
                $session_id = api_get_session_id();
                $course_info = api_get_course_info_by_id($course_id);
                $this->get_course_events($start, $end, $course_info, $group_id, $session_id, $user_id);
                break;
            case 'personal':
            default:
                //Getting personal events
                $this->get_personal_events($start, $end);

                //Getting platform/admin events
                $this->get_platform_events($start, $end);

                //Getting course events
                $my_course_list = array();

                if (!api_is_anonymous()) {
                    $session_list = SessionManager::get_sessions_by_user(api_get_user_id());
                    $my_course_list = CourseManager::get_courses_list_by_user_id(api_get_user_id(), true);
                }

                if (!empty($session_list)) {
                    foreach ($session_list as $session_item) {
                        $my_courses = $session_item['courses'];
                        $my_session_id = $session_item['session_id'];
                        if (!empty($my_courses)) {
                            foreach ($my_courses as $course_item) {
                                $course_info = api_get_course_info($course_item['code']);
                                $this->get_course_events($start, $end, $course_info, 0, $my_session_id);
                            }
                        }
                    }
                }

                if (!empty($my_course_list)) {
                    foreach ($my_course_list as $course_info_item) {
                        if (isset($course_id) && !empty($course_id)) {
                            if ($course_info_item['real_id'] == $course_id) {
                                $this->get_course_events($start, $end, $course_info_item);
                            }
                        } else {
                            $this->get_course_events($start, $end, $course_info_item);
                        }
                    }
                }
                break;
        }
        if (!empty($this->events)) {
            return json_encode($this->events);
        }
        return '';
    }

    function resize_event($id, $day_delta, $minute_delta)
    {
        // we convert the hour delta into minutes and add the minute delta
        $delta = ($day_delta * 60 * 24) + $minute_delta;
        $delta = intval($delta);

        $event = $this->get_event($id);
        if (!empty($event)) {
            switch ($this->type) {
                case 'personal':
                    $sql = "UPDATE $this->tbl_personal_agenda SET all_day = 0, enddate = DATE_ADD(enddate, INTERVAL $delta MINUTE)
							WHERE id=".intval($id);
                    $result = Database::query($sql);
                    break;
                case 'course':
                    $sql = "UPDATE $this->tbl_course_agenda SET all_day = 0,  end_date = DATE_ADD(end_date, INTERVAL $delta MINUTE)
							WHERE c_id = ".$this->course['real_id']." AND id=".intval($id);
                    $result = Database::query($sql);
                    break;
                case 'admin':
                    $sql = "UPDATE $this->tbl_global_agenda SET all_day = 0, end_date = DATE_ADD(end_date, INTERVAL $delta MINUTE)
							WHERE id=".intval($id);
                    $result = Database::query($sql);
                    break;
            }
        }
        return 1;
    }

    function move_event($id, $day_delta, $minute_delta)
    {
        // we convert the hour delta into minutes and add the minute delta
        $delta = ($day_delta * 60 * 24) + $minute_delta;
        $delta = intval($delta);

        $event = $this->get_event($id);

        $all_day = 0;
        if ($day_delta == 0 && $minute_delta == 0) {
            $all_day = 1;
        }

        if (!empty($event)) {
            switch ($this->type) {
                case 'personal':
                    $sql = "UPDATE $this->tbl_personal_agenda SET all_day = $all_day, date = DATE_ADD(date, INTERVAL $delta MINUTE), enddate = DATE_ADD(enddate, INTERVAL $delta MINUTE)
							WHERE id=".intval($id);
                    $result = Database::query($sql);
                    break;
                case 'course':
                    $sql = "UPDATE $this->tbl_course_agenda SET all_day = $all_day, start_date = DATE_ADD(start_date,INTERVAL $delta MINUTE), end_date = DATE_ADD(end_date, INTERVAL $delta MINUTE)
							WHERE c_id = ".$this->course['real_id']." AND id=".intval($id);
                    $result = Database::query($sql);
                    break;
                case 'admin':
                    $sql = "UPDATE $this->tbl_global_agenda SET all_day = $all_day, start_date = DATE_ADD(start_date,INTERVAL $delta MINUTE), end_date = DATE_ADD(end_date, INTERVAL $delta MINUTE)
							WHERE id=".intval($id);
                    $result = Database::query($sql);
                    break;
            }
        }
        return 1;
    }

    /**
     * Gets a single event
     *
     * @param int event id
     * @return array
     */
    function get_event($id)
    {
        // make sure events of the personal agenda can only be seen by the user himself
        $id = intval($id);
        $event = null;
        switch ($this->type) {
            case 'personal':
                $sql = " SELECT * FROM ".$this->tbl_personal_agenda." WHERE id = $id AND user = ".api_get_user_id();
                $result = Database::query($sql);
                if (Database::num_rows($result)) {
                    $event = Database::fetch_array($result, 'ASSOC');
                    $event['description'] = $event['text'];
                    $event['start_date'] = $event['date'];
                    $event['end_date'] = $event['enddate'];
                }
                break;
            case 'course':
                if (!empty($this->course['real_id'])) {
                    $sql = " SELECT * FROM ".$this->tbl_course_agenda." WHERE c_id = ".$this->course['real_id']." AND id = ".$id;
                    $result = Database::query($sql);
                    if (Database::num_rows($result)) {
                        $event = Database::fetch_array($result, 'ASSOC');
                        $event['description'] = $event['content'];
                    }
                }
                break;
            case 'admin':
            case 'platform':
                $sql = " SELECT * FROM ".$this->tbl_global_agenda." WHERE id=".$id;
                $result = Database::query($sql);
                if (Database::num_rows($result)) {
                    $event = Database::fetch_array($result, 'ASSOC');
                    $event['description'] = $event['content'];
                }
                break;
        }
        return $event;
    }

    /**
     *
     * Gets personal events
     * @param int 	start date tms
     * @param int	end   date tms
     */
    function get_personal_events($start, $end)
    {
        $start = intval($start);
        $end = intval($end);
        $start = api_get_utc_datetime($start);
        $end = api_get_utc_datetime($end);
        $user_id = api_get_user_id();

        $sql = "SELECT * FROM ".$this->tbl_personal_agenda."
				   WHERE date >= '".$start."' AND (enddate <='".$end."' OR enddate IS NULL) AND user = $user_id";

        $result = Database::query($sql);
        $my_events = array();
        if (Database::num_rows($result)) {
            while ($row = Database::fetch_array($result, 'ASSOC')) {
                $event = array();
                $event['id'] = 'personal_'.$row['id'];
                $event['title'] = $row['title'];
                $event['className'] = 'personal';
                $event['borderColor'] = $event['backgroundColor'] = $this->event_personal_color;
                $event['editable'] = true;

                $event['sent_to'] = get_lang('Me');
                $event['type'] = 'personal';

                if (!empty($row['date']) && $row['date'] != '0000-00-00 00:00:00') {
                    $event['start'] = $this->format_event_date($row['date']);
                }

                if (!empty($row['enddate']) && $row['enddate'] != '0000-00-00 00:00:00') {
                    $event['end'] = $this->format_event_date($row['enddate']);
                }
                $event['description'] = $row['text'];
                $event['allDay'] = isset($row['all_day']) && $row['all_day'] == 1 ? $row['all_day'] : 0;
                $my_events[] = $event;
                $this->events[] = $event;
            }
        }
        return $my_events;
    }

    function get_course_events($start, $end, $course_info, $group_id = 0, $session_id = 0, $user_id = 0)
    {
        $course_id = $course_info['real_id'];
        $user_id = intval($user_id);

        $group_list = GroupManager::get_group_list(null, $course_info['code']);

        $group_name_list = array();
        if (!empty($group_list)) {
            foreach ($group_list as $group) {
                $group_name_list[$group['id']] = $group['name'];
            }
        }

        if (!api_is_allowed_to_edit()) {
            $group_memberships = GroupManager::get_group_ids($course_id, api_get_user_id());
            $user_id = api_get_user_id();
        } else {
            $group_memberships = GroupManager::get_group_ids($course_id, $user_id);
        }

        $tlb_course_agenda = Database::get_course_table(TABLE_AGENDA);
        $tbl_property = Database::get_course_table(TABLE_ITEM_PROPERTY);

        if (!empty($group_id)) {
            $group_memberships = array($group_id);
        }

        $session_id = intval($session_id);
       
        if (is_array($group_memberships) && count($group_memberships) > 0) {
            if (api_is_allowed_to_edit()) {
                if (!empty($group_id)){
                    $where_condition = "( ip.to_group_id IN (0, ".implode(", ", $group_memberships).") ) "; 
                } else {
                    if (!empty($user_id)) {
                        $where_condition = "( ip.to_user_id = $user_id OR ip.to_group_id IN (0, ".implode(", ", $group_memberships).") ) ";
                    } else {
                        $where_condition = "( ip.to_group_id is null OR ip.to_group_id IN (0, ".implode(", ", $group_memberships).") ) ";
                    }
                }
            } else {
                $where_condition = "( ip.to_user_id = $user_id OR ip.to_group_id IN (0, ".implode(", ", $group_memberships).") ) ";
            }

            $sql = "SELECT DISTINCT agenda.*, ip.visibility, ip.to_group_id, ip.insert_user_id, ip.ref, to_user_id
                    FROM ".$tlb_course_agenda." agenda, ".$tbl_property." ip
                    WHERE   agenda.id       = ip.ref  AND
                            ip.tool         ='".TOOL_CALENDAR_EVENT."' AND
                            $where_condition AND
                            ip.visibility   = '1' AND
                            agenda.c_id     = $course_id AND
                            ip.c_id         = $course_id

                    GROUP BY id";
        } else {
            if (api_is_allowed_to_edit()) {
                if ($user_id == 0) {
                    $where_condition = "";
                } else {
                    $where_condition = "( ip.to_user_id=".$user_id. ") AND ";
                }
            } else {
                $where_condition = "( ip.to_user_id=$user_id OR ip.to_group_id='0') AND ";
            }

            $sql = "SELECT DISTINCT agenda.*, ip.visibility, ip.to_group_id, ip.insert_user_id, ip.ref, to_user_id
                    FROM ".$tlb_course_agenda." agenda, ".$tbl_property." ip
                    WHERE   agenda.id = ip.ref AND
                            ip.tool='".TOOL_CALENDAR_EVENT."' AND
                            $where_condition
                            ip.visibility='1' AND
                            agenda.c_id = $course_id AND
                            ip.c_id = $course_id AND
                            agenda.session_id = $session_id AND
                            ip.id_session = $session_id
                    ";
        }

        $result = Database::query($sql);
        $events = array();
        if (Database::num_rows($result)) {
            $events_added = array();
            while ($row = Database::fetch_array($result, 'ASSOC')) {
                //to gather sent_tos
                $sql = "SELECT to_user_id, to_group_id
                    FROM ".$tbl_property." ip
                    WHERE   ip.tool         = '".TOOL_CALENDAR_EVENT."' AND
                            ref             = {$row['ref']} AND
                            ip.visibility   = '1' AND
                            ip.c_id         = $course_id";
                $sent_to_result = Database::query($sql);
                $user_to_array = array();
                $group_to_array = array();
                while ($row_send_to = Database::fetch_array($sent_to_result, 'ASSOC')) {
                    if (!empty($row_send_to['to_group_id'])) {
                        $group_to_array[] = $row_send_to['to_group_id'];
                    }
                    if (!empty($row_send_to['to_user_id'])) {
                        $user_to_array[] = $row_send_to['to_user_id'];
                    }
                }

                //Only show events from the session
                /* if (api_get_course_int_id()) {
                  if ($row['session_id'] != api_get_session_id()) {
                  continue;
                  }
                  } */

                $event = array();

                $event['id'] = 'course_'.$row['id'];

                //To avoid doubles
                if (in_array($row['id'], $events_added)) {
                    continue;
                }

                $events_added[] = $row['id'];

                $attachment = get_attachment($row['id'], $course_id);

                $has_attachment = '';

                if (!empty($attachment)) {
                    $has_attachment = Display::return_icon('attachment.gif', get_lang('Attachment'));
                    $user_filename = $attachment['filename'];
                    $full_file_name = 'download.php?file='.$attachment['path'].'&course_id='.$course_id;
                    $event['attachment'] = $has_attachment.Display::url($user_filename, $full_file_name);
                } else {
                    $event['attachment'] = '';
                }

                $event['title'] = $row['title'];
                $event['className'] = 'course';
                $event['allDay'] = 'false';

                $event['course_id'] = $course_id;

                $event['borderColor'] = $event['backgroundColor'] = $this->event_course_color;
                if (isset($row['session_id']) && !empty($row['session_id'])) {
                    $event['borderColor'] = $event['backgroundColor'] = $this->event_session_color;
                }

                if (isset($row['to_group_id']) && !empty($row['to_group_id'])) {
                    $event['borderColor'] = $event['backgroundColor'] = $this->event_group_color;
                }

                $event['editable'] = false;

                if (api_is_allowed_to_edit() && $this->type == 'course') {
                    $event['editable'] = true;
                }

                if (!empty($row['start_date']) && $row['start_date'] != '0000-00-00 00:00:00') {
                    $event['start'] = $this->format_event_date($row['start_date']);
                }
                if (!empty($row['end_date']) && $row['end_date'] != '0000-00-00 00:00:00') {
                    $event['end'] = $this->format_event_date($row['end_date']);
                }

                $event['sent_to'] = '';
                //$event['type']    = $this->type;
                $event['type'] = 'course';
                if ($row['session_id'] != 0) {
                    $event['type'] = 'session';
                }

                //Event Sent to a group?
                if (isset($row['to_group_id']) && !empty($row['to_group_id'])) {
                    $sent_to = array();
                    if (!empty($group_to_array)) {
                        foreach ($group_to_array as $group_item) {
                            $sent_to[] = $group_name_list[$group_item];
                        }
                    }
                    $sent_to = implode('@@', $sent_to);
                    $sent_to = str_replace('@@', '</div><div class="label_tag notice">', $sent_to);
                    $event['sent_to'] = '<div class="label_tag notice">'.$sent_to.'</div>';
                    $event['type'] = 'group';
                }

                //Event sent to a user?
                if (isset($row['to_user_id'])) {
                    $sent_to = array();
                    if (!empty($user_to_array)) {
                        foreach ($user_to_array as $item) {
                            $user_info = api_get_user_info($item);
                            // add username as tooltip for $event['sent_to'] - ref #4226
                            $username = api_htmlentities(sprintf(get_lang('LoginX'), $user_info['username']), ENT_QUOTES);
                            $sent_to[] = "<span title='".$username."'>".$user_info['complete_name']."</span>";
                        }
                    }
                    $sent_to = implode('@@', $sent_to);
                    $sent_to = str_replace('@@', '</div><div class="label_tag notice">', $sent_to);
                    $event['sent_to'] = '<div class="label_tag notice">'.$sent_to.'</div>';
                }

                //Event sent to everyone!
                if (empty($event['sent_to'])) {
                    $event['sent_to'] = '<div class="label_tag notice">'.get_lang('Everyone').'</div>';
                }

                $event['description'] = $row['content'];
                $event['allDay'] = isset($row['all_day']) && $row['all_day'] == 1 ? $row['all_day'] : 0;

                $this->events[] = $event;
            }
        }
        return $this->events;
    }

    function get_platform_events($start, $end)
    {
        $start = intval($start);
        $end = intval($end);

        $start = api_get_utc_datetime($start);
        $end = api_get_utc_datetime($end);

        $access_url_id = api_get_current_access_url_id();

        $sql = "SELECT * FROM ".$this->tbl_global_agenda."
				   WHERE start_date >= '".$start."' AND end_date <= '".$end."' AND access_url_id = $access_url_id ";

        $result = Database::query($sql);
        $my_events = array();
        if (Database::num_rows($result)) {
            while ($row = Database::fetch_array($result, 'ASSOC')) {
                $event = array();
                $event['id'] = 'platform_'.$row['id'];
                $event['title'] = $row['title'];
                $event['className'] = 'platform';
                $event['allDay'] = 'false';
                $event['borderColor'] = $event['backgroundColor'] = $this->event_platform_color;
                $event['editable'] = false;

                $event['type'] = 'admin';

                if (api_is_platform_admin() && $this->type == 'admin') {
                    $event['editable'] = true;
                }

                if (!empty($row['start_date']) && $row['start_date'] != '0000-00-00 00:00:00') {
                    $event['start'] = $this->format_event_date($row['start_date']);
                }
                if (!empty($row['end_date']) && $row['end_date'] != '0000-00-00 00:00:00') {
                    $event['end'] = $this->format_event_date($row['end_date']);
                }

                $event['description'] = $row['content'];
                $event['allDay'] = isset($row['all_day']) && $row['all_day'] == 1 ? $row['all_day'] : 0;

                $my_events[] = $event;
                $this->events[] = $event;
            }
        }
        return $my_events;
    }

    /**
     * Format needed for the Fullcalendar js lib
     *  @param string UTC time
     */
    function format_event_date($utc_time)
    {
        return date('c', api_strtotime(api_get_local_time($utc_time)));
    }

    /**
     * this function shows the form with the user that were not selected
     * @author: Patrick Cool <patrick.cool@UGent.be>, Ghent University
     * @return html code
     */
    static function construct_not_selected_select_form($group_list = null, $user_list = null, $to_already_selected = array())
    {
        $html = '<select id="users_to_send_id" data-placeholder="'.get_lang('Select').'" name="users_to_send[]" multiple="multiple" style="width:250px" class="chzn-select">';


        if ($to_already_selected == 'everyone') {
            $html .= '<option value="everyone" checked="checked">'.get_lang('Everyone').'</option>';
        } else {
            $html .= '<option value="everyone">'.get_lang('Everyone').'</option>';
        }

        if (is_array($group_list)) {
            $html .= '<optgroup label="'.get_lang('Groups').'">';
            foreach ($group_list as $this_group) {
                if (!is_array($to_already_selected) || !in_array("GROUP:".$this_group['id'], $to_already_selected)) {
                    // $to_already_selected is the array containing the groups (and users) that are already selected
                    $count_users = isset($this_group['count_users']) ? $this_group['count_users'] : $this_group['userNb'];
                    $count_users = " &ndash; $count_users ".get_lang('Users');

                    $html .= '<option value="GROUP:'.$this_group['id'].'"> '.$this_group['name'].$count_users.'</option>';
                }
            }
            $html .= '</optgroup>';
        }

        // adding the individual users to the select form
        if (is_array($group_list)) {
            $html .= '<optgroup label="'.get_lang('Users').'">';
        }
        foreach ($user_list as $this_user) {
            // $to_already_selected is the array containing the users (and groups) that are already selected
            if (!is_array($to_already_selected) || !in_array("USER:".$this_user['user_id'], $to_already_selected)) {
                $username = api_htmlentities(sprintf(get_lang('LoginX'), $this_user['username']), ENT_QUOTES);
                // @todo : add title attribute $username in the jqdialog window. wait for a chosen version to inherit title attribute
                $html .= '<option title="'.$username.'" value="USER:'.$this_user['user_id'].'">'.api_get_person_name($this_user['firstname'], $this_user['lastname']).' ('.$this_user['username'].') </option>';
            }
        }
        if (is_array($group_list)) {
            $html .= '</optgroup>';
            $html .= "</select>";
        }
        return $html;
    }

    static function construct_not_selected_select_form_validator($form, $group_list = null, $user_list = null, $to_already_selected = array())
    {

        $params = array(
            'id' => 'users_to_send_id',
            'data-placeholder' => get_lang('Select'),
            'multiple' => 'multiple',
            'style' => 'width:250px',
            'class' => 'chzn-select'
        );

        $select = $form->addElement('select', 'users_to_send', get_lang('To'), null, $params);

        $select->addOption(get_lang('Everyone'), 'everyone');

        $options = array();
        if (is_array($group_list)) {
            foreach ($group_list as $this_group) {
                if (!is_array($to_already_selected) || !in_array("GROUP:".$this_group['id'], $to_already_selected)) {
                    // $to_already_selected is the array containing the groups (and users) that are already selected
                    $count_users = isset($this_group['count_users']) ? $this_group['count_users'] : $this_group['userNb'];
                    $count_users = " &ndash; $count_users ".get_lang('Users');
                    $options[] = array('text' => $this_group['name'].$count_users, 'value' => "GROUP:".$this_group['id']);
                }
            }
            $select->addOptGroup($options, get_lang('Groups'));
            $html .= '</optgroup>';
        }

        // adding the individual users to the select form
        if (is_array($group_list)) {
            $options = array();
            foreach ($user_list as $this_user) {
                // $to_already_selected is the array containing the users (and groups) that are already selected
                if (!is_array($to_already_selected) || !in_array("USER:".$this_user['user_id'], $to_already_selected)) {
                    //$username = api_htmlentities(sprintf(get_lang('LoginX'), $this_user['username']), ENT_QUOTES);
                    // @todo : add title attribute $username in the jqdialog window. wait for a chosen version to inherit title attribute
                    // from <option> to <li>
                    //$html .= '<option title="'.$username.'" value="USER:'.$this_user['user_id'].'">'.api_get_person_name($this_user['firstname'], $this_user['lastname']).' ('.$this_user['username'].') </option>';
                    $options[] = array('text' => api_get_person_name($this_user['firstname'], $this_user['lastname']).' ('.$this_user['username'].')',
                        'value' => "USER:".$this_user['user_id']);
                }
            }
            $select->addOptGroup($options, get_lang('Users'));
        }
    }

    /**
     * This function separates the users from the groups
     * users have a value USER:XXX (with XXX the dokeos id
     * groups have a value GROUP:YYY (with YYY the group id)
     * @author: Patrick Cool <patrick.cool@UGent.be>, Ghent University
     * @return array
     */
    function separate_users_groups($to)
    {
        $grouplist = array();
        $userlist = array();
        $send_to = null;

        $send_to['everyone'] = false;
        if (is_array($to) && count($to) > 0) {
            foreach ($to as $to_item) {
                if ($to_item == 'everyone') {
                    $send_to['everyone'] = true;
                } else {
                    list($type, $id) = explode(':', $to_item);
                    switch ($type) {
                        case 'GROUP':
                            $grouplist[] = $id;
                            break;
                        case 'USER':
                            $userlist[] = $id;
                            break;
                    }
                }
            }
            $send_to['groups'] = $grouplist;
            $send_to['users'] = $userlist;
        }
        return $send_to;
    }

    static function show_form($params = array())
    {
        $form = new FormValidator('add_event', 'POST', api_get_self().'?'.api_get_cidreq(), null, array('enctype' => 'multipart/form-data'));
        $id = isset($params['id']) ? $params['id'] : null;

        if ($id) {
            $form_title = get_lang('ModifyCalendarItem');
            $button = get_lang('ModifyEvent');
        } else {
            $form_title = get_lang('AddCalendarItem');
            $button = get_lang('AgendaAdd');
        }

        $form->addElement('header', $form_title);
        $form->addElement('hidden', 'id', $id);
        $form->addElement('hidden', 'action', $params['action']);
        $form->addElement('hidden', 'id_attach', $params['id_attach']);

        $form->addElement('text', 'title', get_lang('ItemTitle'));

        $group_id = api_get_group_id();

        if (isset($group_id) && !empty($group_id)) {
            $form->addElement('hidden', 'selected_form[0]', "GROUP:'.$group_id.'");
            $form->addElement('hidden', 'to', 'true');
        } else {
            self::show_to_form($form, $to);
        }

        $form->addElement('text', 'start_date', get_lang('StartDate'));
        $form->addElement('text', 'end_date', get_lang('EndDate'));

        if (empty($id)) {
            $form->addElement('advanced_settings', '<a href="javascript://" onclick="return plus_repeated_event();"><span id="plus2">
                                   <img style="vertical-align:middle;" src="../img/div_show.gif" alt="" />&nbsp;'.get_lang('RepeatEvent').'</span>
                                </a>');
            $form->addElement('html', '<div style="display:block">');

            $form->addElement('checkbox', 'repeat', null, get_lang('RepeatEvent'));

            $repeat_events = array(
                'daily' => get_lang('RepeatDaily'),
                'weekly' => get_lang('RepeatWeekly'),
                'monthlyByDate' => get_lang('RepeatMonthlyByDate'),
                'yearly' => get_lang('RepeatYearly')
            );

            $form->addElement('select', 'repeat_type', get_lang('RepeatType'), $repeat_events);
            $form->addElement('text', 'repeat_end_day', get_lang('RepeatEnd'));
            $form->addElement('html', '</div>');

            if (!api_is_allowed_to_edit(null, true)) {
                $toolbar = 'AgendaStudent';
            } else {
                $toolbar = 'Agenda';
            }
            //$form->addElement('html_editor', 'content', get_lang('Description'), null, array('ToolbarSet' => $toolbar, 'Width' => '100%', 'Height' => '200'));

            $form->addElement('file', 'user_upload', get_lang('AddAnAttachment'));
            $form->addElement('text', 'file_comment', get_lang('Comment'));
        }

        $form->addElement('button', 'submit', $button);
        $form->display();
    }

    static function show_to_form($form, $to_already_selected)
    {
        $order = 'lastname';
        if (api_is_western_name_order()) {
            $order = 'firstname';
        }
        $user_list = CourseManager::get_user_list_from_course_code(api_get_course_id(), api_get_session_id(), null, $order);
        $group_list = CourseManager::get_group_list_of_course(api_get_course_id(), api_get_session_id());

        self::construct_not_selected_select_form_validator($form, $group_list, $user_list, $to_already_selected);
    }
}