<?php
/* For licensing terms, see /license.txt */
/**
*	Code library for showing Who is online
*
*	@author Istvan Mandak, principal author
*	@author Denes Nagy, principal author
*	@author Bart Mollet
*	@author Roan Embrechts, cleaning and bugfixing
*	@package chamilo.whoisonline
*/

/**
 * Insert a login reference for the current user into the track_e_online stats table.
 * This table keeps trace of the last login. Nothing else matters (we don't keep traces of anything older)
 * @param int user id
 * @return void
 */

use \ChamiloSession as Session;

function LoginCheck($uid) {
	global $_course, $_configuration;
	$uid = (int) $uid;
	$online_table = Database::get_main_table(TABLE_STATISTIC_TRACK_E_ONLINE);
    if (!empty($uid)) {
        $login_ip = '';
        if (!empty($_SERVER['REMOTE_ADDR'])) {
            $login_ip = Database::escape_string($_SERVER['REMOTE_ADDR']);
        }

		$login_date = api_get_utc_datetime();
		$access_url_id = 1;
		if (api_get_multiple_access_url() && api_get_current_access_url_id()!=-1) {
			$access_url_id = api_get_current_access_url_id();
		}
		$session_id = api_get_session_id();
		// if the $_course array exists this means we are in a course and we have to store this in the who's online table also
		// to have the x users in this course feature working
		if (is_array($_course) && count($_course)>0 && !empty($_course['id'])) {
            $query = "REPLACE INTO ".$online_table ." (login_id,login_user_id,login_date,login_ip, course, session_id, access_url_id) VALUES ($uid,$uid,'$login_date','$login_ip', '".$_course['id']."' , '$session_id' , '$access_url_id' )";
		} else {
            $query = "REPLACE INTO ".$online_table ." (login_id,login_user_id,login_date,login_ip, session_id, access_url_id) VALUES ($uid,$uid,'$login_date','$login_ip', '$session_id', '$access_url_id')";
		}
		@Database::query($query);
	}
}

/**
 * @param int $userId
 */
function preventMultipleLogin($userId)
{
    global $_configuration;
    $table = Database::get_main_table(TABLE_STATISTIC_TRACK_E_ONLINE);
    $userId = intval($userId);

    if (isset($_configuration['prevent_multiple_simultaneous_login']) &&
        $_configuration['prevent_multiple_simultaneous_login']
    ) {
        if (!empty($userId) && !api_is_anonymous()) {

            $isFirstLogin = Session::read('first_user_login');
            if (empty($isFirstLogin)) {
                $sql = "SELECT login_id FROM $table
                        WHERE login_user_id = " . $userId . " LIMIT 1";

                $result = Database::query($sql);
                $loginData = array();
                if (Database::num_rows($result)) {
                    $loginData = Database::fetch_array($result);
                }

                $userIsReallyOnline = user_is_online($userId);

                // Trying double login.
                if (!empty($loginData) && $userIsReallyOnline == true) {
                    session_regenerate_id();
                    Session::destroy();
                    header('Location: '.api_get_path(WEB_PATH).'index.php?loginFailed=1&error=multiple_connection_not_allowed');
                    exit;
                } else {
                    // First time
                    Session::write('first_user_login', 1);
                }
            }
        }
    }
}

/**
 * This function handles the logout and is called whenever there is a $_GET['logout']
 * @return void  Directly redirects the user or leaves him where he is, but doesn't return anything
 * @author Fernando P. García <fernando@develcuy.com>
 */
function online_logout($user_id = null, $logout_redirect = false) {
    global $_configuration, $extAuthSource;

    // Database table definition
    $tbl_track_login = Database :: get_statistic_table(TABLE_STATISTIC_TRACK_E_LOGIN);

    if (empty($user_id)) {
        $user_id = intval($_GET['uid']);
    }

    //Changing global chat status to offline
    if (api_is_global_chat_enabled()) {
        $chat = new Chat();
        $chat->set_user_status(0);
    }

    // selecting the last login of the user
    $sql_last_connection="SELECT login_id, login_date FROM $tbl_track_login WHERE login_user_id='$user_id' ORDER BY login_date DESC LIMIT 0,1";
    $q_last_connection=Database::query($sql_last_connection);
    if (Database::num_rows($q_last_connection)>0) {
        $i_id_last_connection=Database::result($q_last_connection,0,"login_id");
    }

    if (!isset($_SESSION['login_as'])) {
        $current_date = api_get_utc_datetime();
        $s_sql_update_logout_date="UPDATE $tbl_track_login SET logout_date='".$current_date."' WHERE login_id='$i_id_last_connection'";
        Database::query($s_sql_update_logout_date);
    }
    LoginDelete($user_id); //from inc/lib/online.inc.php - removes the "online" status

    //the following code enables the use of an external logout function.
    //example: define a $extAuthSource['ldap']['logout']="file.php" in configuration.php
    // then a function called ldap_logout() inside that file
    // (using *authent_name*_logout as the function name) and the following code
    // will find and execute it
    $uinfo = api_get_user_info($user_id);
    if (($uinfo['auth_source'] != PLATFORM_AUTH_SOURCE) && is_array($extAuthSource)) {
        if (is_array($extAuthSource[$uinfo['auth_source']])) {
            $subarray = $extAuthSource[$uinfo['auth_source']];
            if (!empty($subarray['logout']) && file_exists($subarray['logout'])) {
                require_once($subarray['logout']);
                $logout_function = $uinfo['auth_source'].'_logout';
                if (function_exists($logout_function)) {
                    $logout_function($uinfo);
                }
            }
        }
    }

    require_once api_get_path(SYS_PATH) . 'main/chat/chat_functions.lib.php';
    exit_of_chat($user_id);
    session_regenerate_id();
    Session::destroy();
    if ($logout_redirect) {
        header("Location: index.php");
        return;
    }
}

/**
 * Remove all login records from the track_e_online stats table, for the given user ID.
 * @param int User ID
 * @return void
 */
function LoginDelete($user_id)
{
	$online_table = Database::get_statistic_table(TABLE_STATISTIC_TRACK_E_ONLINE);
    $user_id = intval($user_id);
	$query = "DELETE FROM ".$online_table ." WHERE login_user_id = '".$user_id."'";
	@Database::query($query);
}

/**
 * @param int $user_id
 * @return bool
 */
function user_is_online($user_id)
{
	$track_online_table = Database::get_statistic_table(TABLE_STATISTIC_TRACK_E_ONLINE);
	$table_user			= Database::get_main_table(TABLE_MAIN_USER);

	$access_url_id		= api_get_current_access_url_id();
	$time_limit			= api_get_setting('time_limit_whosonline');

    $online_time 	= time() - $time_limit*60;
    $limit_date		= api_get_utc_datetime($online_time);
    $user_id = intval($user_id);

	$query = " SELECT login_user_id,login_date
               FROM $track_online_table track
               INNER JOIN $table_user u ON (u.user_id=track.login_user_id)
               WHERE
                    track.access_url_id =  $access_url_id AND
                    login_date >= '".$limit_date."'  AND
                    u.user_id =  $user_id
               LIMIT 1 ";

	$result = Database::query($query);
	if (Database::num_rows($result)) {
		return true;
	}
	return false;

}
/**
 * Gives a list of people online now (and in the last $valid minutes)
 * @return  array       For each line, a list of user IDs and login dates, or FALSE on error or empty results
 */
function who_is_online($from, $number_of_items, $column = null, $direction = null, $time_limit = null, $friends = false) {

    // Time limit in seconds?
    if (empty($time_limit)) {
        $time_limit = api_get_setting('time_limit_whosonline');
    } else {
        $time_limit = intval($time_limit);
    }

    $from            = intval($from);
    $number_of_items = intval($number_of_items);

    if (empty($column)) {
        $column = 'picture_uri';
        if ($friends) {
            $column = 'login_date';
        }
    }

    if (empty($direction)) {
        $direction = 'DESC';
    } else {
        if (!in_array(strtolower($direction), array('asc', 'desc'))) {
            $direction = 'DESC';
        }
    }

    $online_time 		= time() - $time_limit*60;
	$current_date		= api_get_utc_datetime($online_time);
	$track_online_table = Database::get_statistic_table(TABLE_STATISTIC_TRACK_E_ONLINE);
	$friend_user_table  = Database::get_main_table(TABLE_MAIN_USER_REL_USER);
	$table_user			= Database::get_main_table(TABLE_MAIN_USER);
	$query              = '';

	if ($friends) {
		// 	who friends from social network is online
		$query = "SELECT DISTINCT login_user_id, login_date
				  FROM $track_online_table INNER JOIN $friend_user_table
				  ON (friend_user_id = login_user_id)
				  WHERE
				    login_date >= '".$current_date."' AND
                    friend_user_id <> '".api_get_user_id()."' AND
                    relation_type='".USER_RELATION_TYPE_FRIEND."' AND
                    user_id = '".api_get_user_id()."'
                  ORDER BY $column $direction
                  LIMIT $from, $number_of_items";
	} else {
		$query = "SELECT DISTINCT login_user_id, login_date
                    FROM ".$track_online_table ." e
		            INNER JOIN ".$table_user ." u ON (u.user_id=e.login_user_id)
                  WHERE u.status != ".ANONYMOUS." AND login_date >= '".$current_date."'
                  ORDER BY $column $direction
                  LIMIT $from, $number_of_items";
	}

	if (api_get_multiple_access_url()) {
		$access_url_id = api_get_current_access_url_id();
		if ($access_url_id != -1) {
			if ($friends) {
				// 	friends from social network is online
				$query = "SELECT distinct login_user_id,login_date
							FROM $track_online_table track INNER JOIN $friend_user_table
							ON (friend_user_id = login_user_id)
							WHERE   track.access_url_id =  $access_url_id AND
                                    login_date >= '".$current_date."' AND
                                    friend_user_id <> '".api_get_user_id()."' AND
                                    relation_type='".USER_RELATION_TYPE_FRIEND."'
                            ORDER BY $column $direction
                            LIMIT $from, $number_of_items";
			} else {
				// all users online
				$query = "SELECT login_user_id, login_date FROM ".$track_online_table ." track
                          INNER JOIN ".$table_user ." u
                          ON (u.user_id=track.login_user_id)
						  WHERE u.status != ".ANONYMOUS." AND track.access_url_id =  $access_url_id AND
                                login_date >= '".$current_date."'
                          ORDER BY $column $direction
                          LIMIT $from, $number_of_items";
			}
		}
	}

	//This query will show all registered users. Only for dev purposes.
	/*$query = "SELECT DISTINCT u.user_id as login_user_id, login_date FROM ".$track_online_table ."  e , $table_user u
            GROUP by u.user_id
            ORDER BY $column $direction
            LIMIT $from, $number_of_items";*/

	$result = Database::query($query);
	if ($result) {
		$users_online = array();
		while (list($login_user_id, $login_date) = Database::fetch_row($result)) {
            $users_online[] = $login_user_id;
		}
		return $users_online;
	} else {
		return false;
	}
}

function who_is_online_count($time_limit = null, $friends = false)
{
    if (empty($time_limit)) {
        $time_limit = api_get_setting('time_limit_whosonline');
    } else {
        $time_limit = intval($time_limit);
    }
	$track_online_table = Database::get_statistic_table(TABLE_STATISTIC_TRACK_E_ONLINE);
	$friend_user_table  = Database::get_main_table(TABLE_MAIN_USER_REL_USER);
    $table_user			= Database::get_main_table(TABLE_MAIN_USER);

	$query = '';

    $online_time 		= time() - $time_limit*60;
	$current_date		= api_get_utc_datetime($online_time);

	if ($friends) {
		// 	who friends from social network is online
		$query = "SELECT DISTINCT count(login_user_id) as count
				  FROM $track_online_table INNER JOIN $friend_user_table
                  ON (friend_user_id = login_user_id)
				  WHERE
				        login_date >= '$current_date' AND
				        friend_user_id <> '".api_get_user_id()."' AND
				        relation_type='".USER_RELATION_TYPE_FRIEND."' AND
				        user_id = '".api_get_user_id()."' ";
	} else {
		// All users online
		$query = "SELECT count(login_id) as count
                  FROM $track_online_table track INNER JOIN $table_user u
                  ON (u.user_id=track.login_user_id)
                  WHERE u.status != ".ANONYMOUS." AND login_date >= '$current_date'  ";
	}

	if (api_get_multiple_access_url()) {
		$access_url_id = api_get_current_access_url_id();
		if ($access_url_id != -1) {
			if ($friends) {
				// 	friends from social network is online
				$query = "SELECT DISTINCT count(login_user_id) as count
							FROM $track_online_table track
							INNER JOIN $friend_user_table ON (friend_user_id = login_user_id)
							WHERE
							    track.access_url_id = $access_url_id AND
							    login_date >= '".$current_date."' AND
							    friend_user_id <> '".api_get_user_id()."' AND
							    relation_type='".USER_RELATION_TYPE_FRIEND."'  ";
			} else {
				// all users online
				$query = "SELECT count(login_id) as count FROM $track_online_table  track
                          INNER JOIN $table_user u ON (u.user_id=track.login_user_id)
						  WHERE
						    u.status != ".ANONYMOUS." AND
						    track.access_url_id =  $access_url_id AND
						    login_date >= '$current_date' ";
			}
		}
	}

    // Dev purposes show all users online
    /*$table_user = Database::get_main_table(TABLE_MAIN_USER);
    $query = "SELECT count(*)  as count FROM ".$table_user;*/

	$result = Database::query($query);
	if (Database::num_rows($result) > 0) {
		$row = Database::fetch_array($result);
		return $row['count'];
	} else {
		return false;
	}
}


/**
* Returns a list (array) of users who are online and in this course.
* @param    int User ID
* @param    int Number of minutes
* @param    string  Course code (could be empty, but then the function returns false)
* @return   array   Each line gives a user id and a login time
*/
function who_is_online_in_this_course($from, $number_of_items, $uid, $time_limit, $course_code)
{
	if (empty($course_code)) return false;

    if (empty($time_limit)) {
        $time_limit = api_get_setting('time_limit_whosonline');
    } else {
        $time_limit = intval($time_limit);
    }

    $online_time 		= time() - $time_limit*60;
    $current_date		= api_get_utc_datetime($online_time);
    $track_online_table = Database::get_main_table(TABLE_STATISTIC_TRACK_E_ONLINE);
    $course_code         = Database::escape_string($course_code);

    $from = intval($from);
    $number_of_items = intval($number_of_items);

	$query = "SELECT login_user_id, login_date FROM $track_online_table
              WHERE login_user_id <> 2 AND course='$course_code' AND login_date >= '$current_date'
              LIMIT $from, $number_of_items ";

	$result = Database::query($query);
	if ($result) {
        /*$valid_date_time = new DateTime();
        $diff = "PT".$time_limit.'M';
        $valid_date_time->sub(new DateInterval($diff));*/
		$users_online = array();

		while(list($login_user_id, $login_date) = Database::fetch_row($result)) {
            /*$user_login_date = new DateTime($login_date);
			if ($user_login_date > $valid_date_time->format('Y-m-d H:i:s')) {*/
				$users_online[] = $login_user_id;
			//}
		}
		return $users_online;
	} else {
		return false;
	}
}

function who_is_online_in_this_course_count($uid, $time_limit, $coursecode=null) {
	if(empty($coursecode)) return false;
	$track_online_table = Database::get_main_table(TABLE_STATISTIC_TRACK_E_ONLINE);
	$coursecode = Database::escape_string($coursecode);
	$time_limit = Database::escape_string($time_limit);

    $online_time = time() - $time_limit * 60;
    $current_date = api_get_utc_datetime($online_time);

	$query = "SELECT count(login_user_id) as count
              FROM ".$track_online_table ."
              WHERE login_user_id <> 2 AND course='".$coursecode."' AND login_date >= '$current_date' ";
	$result = Database::query($query);
	if (Database::num_rows($result) > 0) {
		$row = Database::fetch_array($result);
		return $row['count'];
	} else {
		return false;
	}
}

/**
 * Gets the full user name for a given user ID
 * @param   int User ID
 * @return  string  The full username, elements separated by an HTML space
 * @deprecated user api_get_user_info($user_id)
 */
function GetFullUserName($uid) {
	$uid = (int) $uid;
	$uid = intval($uid);
	$user_table = Database::get_main_table(TABLE_MAIN_USER);
	$query = "SELECT firstname, lastname FROM ".$user_table." WHERE user_id='$uid'";
	$result = @Database::query($query);
	if (count($result)>0) {
		$str = '';
		while(list($firstname,$lastname)= Database::fetch_array($result)) {
			$str = str_replace(' ', '&nbsp;', api_get_person_name($firstname, $lastname));
			return $str;
		}
	}
}

/**
 * Gets a list of chat calls made by others to the current user (info kept in main.user table)
 * @param   none - taken from global space
 * @return  string  An HTML-formatted message
 */
function chatcall() {
	global $_user, $_cid;

	if (!$_user['user_id']) {
		return (false);
	}
	$track_user_table = Database::get_main_table(TABLE_MAIN_USER);
	$sql="SELECT chatcall_user_id, chatcall_date FROM $track_user_table
	      WHERE ( user_id = '".$_user['user_id']."' )";
	$result=Database::query($sql);
	$row=Database::fetch_array($result);

	$login_date=$row['chatcall_date'];
	$hour = substr($login_date,11,2);
	$minute = substr($login_date,14,2);
	$secund = substr($login_date,17,2);
	$month = substr($login_date,5,2);
	$day = substr($login_date,8,2);
	$year = substr($login_date,0,4);
	$calltime = mktime($hour,$minute,$secund,$month,$day,$year);

	$time = api_get_utc_datetime($time);
	$minute_passed=5;  //within this limit, the chat call request is valid
	$limittime = mktime(date("H"),date("i")-$minute_passed,date("s"),date("m"),date("d"),date("Y"));

	if (($row['chatcall_user_id']) and ($calltime>$limittime)) {
		$webpath=api_get_path(WEB_CODE_PATH);
		$message=get_lang('YouWereCalled').' : '.GetFullUserName($row['chatcall_user_id'],'').'<br>'.get_lang('DoYouAccept')
							."<p>"
				."<a href=\"".$webpath."chat/chat.php?cidReq=".$_cid."&origin=whoisonlinejoin\">"
				. get_lang("Yes")
				."</a>"
				."&nbsp;&nbsp;|&nbsp;&nbsp;"
				."<a href=\"".api_get_path(WEB_PATH)."webchatdeny.php\">"
				. get_lang("No")
				."</a>"
				."</p>";

		return($message);
	} else {
		return false;
	}
}