<?php
/* For licensing terms, see /license.txt */
/**
 * This script moves all courses to a session in the past (closing the month before)
 * @package chamilo.tests.scripts
 */
/**
 * Init
 */
// comment exit statement before executing
exit;
require __DIR__ . '/../../main/inc/global.inc.php';

$debug = 1;
// Who will be the general coach assigned to all sessions created?
$generalCoach = 'username';

// List of tables that will need an update
$tables = array(
    'c_announcement' => array('c' => 'c_id', 's' => 'session_id'),
    'c_attendance' => array('c' => 'c_id', 's' => 'session_id'),
    'c_blog' => array('c' => 'c_id', 's' => 'session_id'),
    'c_calendar_event' => array('c' => 'c_id', 's' => 'session_id'),
    'c_chat_connected' => array('c' => 'c_id', 's' => 'session_id'),
    'c_course_description' => array('c' => 'c_id', 's' => 'session_id'),
    'c_document' => array('c' => 'c_id', 's' => 'session_id'),
    'c_dropbox_category' => array('c' => 'c_id', 's' => 'session_id'),
    'c_dropbox_file' => array('c' => 'c_id', 's' => 'session_id'),
    'c_dropbox_post' => array('c' => 'c_id', 's' => 'session_id'),
    'c_forum_category' => array('c' => 'c_id', 's' => 'session_id'),
    'c_forum_forum' => array('c' => 'c_id', 's' => 'session_id'),
    'c_forum_thread' => array('c' => 'c_id', 's' => 'session_id'),
    'c_forum_thread_qualify' => array('c' => 'c_id', 's' => 'session_id'),
    'c_forum_thread_qualify_log' => array('c' => 'c_id', 's' => 'session_id'),
    'c_glossary' => array('c' => 'c_id', 's' => 'session_id'),
    'c_group_info' => array('c' => 'c_id', 's' => 'session_id'),
    'c_item_property' => array('c' => 'c_id', 's' => 'id_session'),
    'c_link' => array('c' => 'c_id', 's' => 'session_id'),
    'c_link_category' => array('c' => 'c_id', 's' => 'session_id'),
    'c_lp' => array('c' => 'c_id', 's' => 'session_id'),
    'c_lp_view' => array('c' => 'c_id', 's' => 'session_id'),
    'c_notebook' => array('c' => 'c_id', 's' => 'session_id'),
    'c_quiz' => array('c' => 'c_id', 's' => 'session_id'),
    'c_student_publication' => array('c' => 'c_id', 's' => 'session_id'),
    'c_survey' => array('c' => 'c_id', 's' => 'session_id'),
    'c_survey_invitation' => array('c' => 'c_id', 's' => 'session_id'),
    'c_thematic' => array('c' => 'c_id', 's' => 'session_id'),
    'c_tool' => array('c' => 'c_id', 's' => 'session_id'),
    'c_tool_intro' => array('c' => 'c_id', 's' => 'session_id'),
    'c_wiki' => array('c' => 'c_id', 's' => 'session_id'),
    'c_wiki_mailcue' => array('c' => 'c_id', 's' => 'session_id'),
    'gradebook_category' => array('c' => 'course_code', 's' => 'session_id'),
    //'session_rel_course',
    //'session_rel_course_rel_user',
    //'session_rel_user',
    'track_course_ranking' => array('c' => 'c_id', 's' => 'session_id'),
    'track_e_access' => array('access_cours_code' => 'c_id', 's' => 'access_session_id'),
    'track_e_attempt' => array('c' => 'course_code', 's' => 'session_id'),
    'track_e_course_access' => array('c' => 'course_code', 's' => 'session_id'),
    'track_e_downloads' => array('c' => 'down_cours_id', 's' => 'down_session_id'),
    'track_e_exercices' => array('c' => 'exe_cours_id', 's' => 'session_id'),
    'track_e_item_property' => array('c' => 'course_id', 's' => 'session_id'),
    'track_e_lastaccess' => array('c' => 'access_cours_code', 's' => 'access_session_id'),
    'track_e_links' => array('c' => 'links_cours_id', 's' => 'links_session_id'),
    'track_e_online' => array('c' => 'course', 's' => 'session_id'),
    'track_e_uploads' => array('c' => 'upload_cours_id', 's' => 'upload_session_id'),
    'user_rel_course_vote' => array('c' => 'c_id', 's' => 'session_id'),
);
// Users related tables. From those tables above, only a few have data related
// to users. Other data need not be changed, otherwise the resources will only
// be visible from a specific session.
$userTables = array(
    'c_attendance' => array('c' => 'c_id', 's' => 'session_id'),
    'c_blog' => array('c' => 'c_id', 's' => 'session_id'),
    'c_calendar_event' => array('c' => 'c_id', 's' => 'session_id'),
    'c_chat_connected' => array('c' => 'c_id', 's' => 'session_id'),
    'c_dropbox_category' => array('c' => 'c_id', 's' => 'session_id'),
    'c_dropbox_file' => array('c' => 'c_id', 's' => 'session_id'),
    'c_dropbox_post' => array('c' => 'c_id', 's' => 'session_id'),
    'c_forum_thread' => array('c' => 'c_id', 's' => 'session_id'),
    'c_forum_thread_qualify' => array('c' => 'c_id', 's' => 'session_id'),
    'c_forum_thread_qualify_log' => array('c' => 'c_id', 's' => 'session_id'),
    'c_group_info' => array('c' => 'c_id', 's' => 'session_id'),
    'c_lp_view' => array('c' => 'c_id', 's' => 'session_id'),
    'c_notebook' => array('c' => 'c_id', 's' => 'session_id'),
    'c_student_publication' => array('c' => 'c_id', 's' => 'session_id'),
    'c_wiki' => array('c' => 'c_id', 's' => 'session_id'),
    'c_wiki_mailcue' => array('c' => 'c_id', 's' => 'session_id'),
    'gradebook_category' => array('c' => 'course_code', 's' => 'session_id'),
    //'session_rel_course',
    //'session_rel_course_rel_user',
    //'session_rel_user',
    'track_course_ranking' => array('c' => 'c_id', 's' => 'session_id'),
    'track_e_access' => array('c' => 'c_id', 's' => 'access_session_id'),
    'track_e_attempt' => array('c' => 'c_id', 's' => 'session_id'),
    'track_e_course_access' => array('c' => 'c_id', 's' => 'session_id'),
    'track_e_downloads' => array('c' => 'c_id', 's' => 'down_session_id'),
    'track_e_exercices' => array('c' => 'c_id', 's' => 'session_id'),
    'track_e_item_property' => array('c' => 'course_id', 's' => 'session_id'),
    'track_e_lastaccess' => array('c' => 'c_id', 's' => 'access_session_id'),
    'track_e_links' => array('c' => 'c_id', 's' => 'links_session_id'),
    'track_e_online' => array('c' => 'c_id', 's' => 'session_id'),
    'track_e_uploads' => array('c' => 'upload_cours_id', 's' => 'upload_session_id'),
    'user_rel_course_vote' => array('c' => 'c_id', 's' => 'session_id'),
);


/**
 * Create the sessions
 * For each existing course, create a session that ends on the last day of the
 * past month and starts 2 years before that.
 */
$year = date('Y');
$month = date('m');
$end = api_strtotime($year.'-'.$month.'-01 00:00:00') - 1;
$start = $end - (2*365*86400);

// Prepare a list of admin users to avoid removing their relation to the base course
$sql = 'SELECT user_id FROM '.Database::get_main_table(TABLE_MAIN_ADMIN);
$resultAdmin = Database::query($sql);
$admins = array();
while ($row = Database::fetch_assoc($resultAdmin)) {
    $admins[] = $row['user_id'];
}

$eol = PHP_EOL;
$eof = PHP_EOL;
if (php_sapi_name() != 'cli') {
    echo '<pre>';
    $eol = "<br />".PHP_EOL;
    $eof = '</pre>';
}

$res = Database::select('id, title, code', Database::get_main_table(TABLE_MAIN_COURSE));
foreach ($res as $course) {
    if ($debug) {
        echo $course['title'] . $eol;
    }
    $sessionTitle = $course['title'] . ' (' . $month . '/' . $year . ' - a)';
    $startDate = ($year-2) . '-' . $month . '-01';
    $endDate = $year . '-' . $month . '-01';
    $id = SessionManager::create_session(
        $sessionTitle,
        $startDate,
        $endDate,
        0,
        0,
        0,
        $username,
        0,
        SESSION_VISIBLE_READ_ONLY
    );
    while ($id == 'SessionNameAlreadyExists') {
        if ($debug) {
            echo "Could not create session $sessionTitle" . $eol;
        }
        // Increase the last letter
        $sessionTitle = substr($sessionTitle, 0, -1) . chr(ord(substr($sessionTitle, -1, 1))+1);
        $id = SessionManager::create_session(
            $sessionTitle,
            $startDate,
            $endDate,
            0,
            0,
            0,
            $username,
            0,
            SESSION_VISIBLE_READ_ONLY
        );
    }
    if ($debug) {
        echo "Session $sessionTitle created with ID $id" . $eol;
    }
    SessionManager::add_courses_to_session($id, array($course['id']));
    $resultUsers = Database::query("SELECT user_id FROM " . Database::get_main_table(TABLE_MAIN_COURSE_USER). " WHERE c_id = '" . $course['id'] . "'");
    $users = array();
    while ($row = Database::fetch_assoc($resultUsers)) {
        $users[] = $row['user_id'];
    }
    if ($debug) {
        echo count($users) . " users in course " . $course['title'] . " will be moved to session $id (unless they're admins)" . $eol;
    }
    SessionManager::subscribe_users_to_session_course($users, $id, $course['code']);
    foreach ($userTables as $table => $fields) {
        $table = Database::get_main_database().'.'.$table;
        //c_id + course_id = int, others = char
        if ($fields['c'] == 'c_id' or $fields['c'] == 'course_id') {
            $sql = "UPDATE $table SET " . $fields['s'] . " = $id WHERE " . $fields['c'] . " = " . $course['id'];
        } else {
            $sql = "UPDATE $table SET " . $fields['s'] . " = $id WHERE " . $fields['c'] . " = '" . $course['code'] . "'";
        }
        if ($debug) {
            echo $sql . $eol;
        }
        $resultChange = Database::query($sql);
    }
    // Now clean up by un-subscribing the user from the course itself manually
    // to avoid deleting other stuff
    foreach ($users as $user) {
        if (in_array($user, $admins)) {
            // Skip un-subscribing of admin users
            continue;
        }
        $table = Database::get_main_table(TABLE_MAIN_COURSE_USER);
        $sql = "DELETE FROM $table WHERE user_id = $user AND c_id = '" . $course['id'] . "'";
        if ($debug) {
            echo $sql . $eol;
        }
        $resultRemove = Database::query($sql);
    }
}
if ($debug) {
    echo "End of moving process" . $eol;
}
echo $eof;