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

use Chamilo\CoreBundle\Entity\SessionRelCourseRelUser;
use Symfony\Component\Filesystem\Filesystem;

/**
 * Class StudentFollowUpPlugin.
 */
class StudentFollowUpPlugin extends Plugin
{
    public $hasEntity = true;

    /**
     * StudentFollowUpPlugin constructor.
     */
    protected function __construct()
    {
        parent::__construct(
            '0.1',
            'Julio Montoya',
            [
                'tool_enable' => 'boolean',
            ]
        );
    }

    /**
     * @return StudentFollowUpPlugin
     */
    public static function create()
    {
        static $result = null;

        return $result ? $result : $result = new self();
    }

    public function install()
    {
        $pluginEntityPath = $this->getEntityPath();
        if (!is_dir($pluginEntityPath)) {
            if (!is_writable(dirname($pluginEntityPath))) {
                $message = get_lang('Can\'t create the directory. Please contact your system administrator.').': '.$pluginEntityPath;
                Display::addFlash(Display::return_message($message, 'error'));

                return false;
            }
            mkdir($pluginEntityPath, api_get_permissions_for_new_directories());
        }

        $fs = new Filesystem();
        $fs->mirror(__DIR__.'/Entity/', $pluginEntityPath, null, ['override']);
        $schema = Database::getManager()->getConnection()->getSchemaManager();

        if ($schema->tablesExist('sfu_post') === false) {
            $sql = "CREATE TABLE IF NOT EXISTS sfu_post (id INT AUTO_INCREMENT NOT NULL, insert_user_id INT NOT NULL, user_id INT NOT NULL, parent_id INT DEFAULT NULL, title VARCHAR(255) NOT NULL, content LONGTEXT DEFAULT NULL, external_care_id VARCHAR(255) DEFAULT NULL, created_at DATETIME DEFAULT NULL, updated_at DATETIME DEFAULT NULL, private TINYINT(1) NOT NULL, external_source TINYINT(1) NOT NULL, tags LONGTEXT NOT NULL COMMENT '(DC2Type:array)', attachment VARCHAR(255) NOT NULL, lft INT DEFAULT NULL, rgt INT DEFAULT NULL, lvl INT DEFAULT NULL, root INT DEFAULT NULL, INDEX IDX_35F9473C9C859CC3 (insert_user_id), INDEX IDX_35F9473CA76ED395 (user_id), INDEX IDX_35F9473C727ACA70 (parent_id), PRIMARY KEY(id)) DEFAULT CHARACTER SET utf8 COLLATE utf8_unicode_ci ENGINE = InnoDB;";
            Database::query($sql);
            $sql = "ALTER TABLE sfu_post ADD CONSTRAINT FK_35F9473C9C859CC3 FOREIGN KEY (insert_user_id) REFERENCES user (id);";
            Database::query($sql);
            $sql = "ALTER TABLE sfu_post ADD CONSTRAINT FK_35F9473CA76ED395 FOREIGN KEY (user_id) REFERENCES user (id);";
            Database::query($sql);
            $sql = "ALTER TABLE sfu_post ADD CONSTRAINT FK_35F9473C727ACA70 FOREIGN KEY (parent_id) REFERENCES sfu_post (id) ON DELETE SET NULL;";
            Database::query($sql);
        }
    }

    public function uninstall()
    {
        $pluginEntityPath = $this->getEntityPath();
        $fs = new Filesystem();
        if ($fs->exists($pluginEntityPath)) {
            $fs->remove($pluginEntityPath);
        }
        $table = Database::get_main_table('sfu_post');
        $sql = "DROP TABLE IF EXISTS $table";
        Database::query($sql);
    }

    /**
     * @return string
     */
    public function getEntityPath()
    {
        return api_get_path(SYS_PATH).'src/Chamilo/PluginBundle/Entity/'.$this->getCamelCaseName();
    }

    /**
     * @param int $studentId
     * @param int $currentUserId
     *
     * @return array
     */
    public static function getPermissions($studentId, $currentUserId)
    {
        $installed = AppPlugin::getInstance()->isInstalled('studentfollowup');
        if ($installed === false) {
            return [
                'is_allow' => false,
                'show_private' => false,
            ];
        }

        if ($studentId === $currentUserId) {
            $isAllow = true;
            $showPrivate = true;
        } else {
            $isDrh = api_is_drh();
            $isCareTaker = false;
            $isDrhRelatedViaPost = false;
            $isCourseCoach = false;
            $isDrhRelatedToSession = false;

            // Only admins and DRH that follow the user
            $isAdmin = api_is_platform_admin();

            // Check if user is care taker
            if ($isDrh) {
                $criteria = [
                    'user' => $studentId,
                    'insertUser' => $currentUserId,
                ];
                $repo = Database::getManager()->getRepository('ChamiloPluginBundle:StudentFollowUp\CarePost');
                $post = $repo->findOneBy($criteria);
                if ($post) {
                    $isDrhRelatedViaPost = true;
                }
            }

            // Check if course session coach
            $sessions = SessionManager::get_sessions_by_user($studentId, false, true);
            if (!empty($sessions)) {
                foreach ($sessions as $session) {
                    $sessionId = $session['session_id'];
                    $sessionDrhInfo = SessionManager::getSessionFollowedByDrh(
                        $currentUserId,
                        $sessionId
                    );
                    if (!empty($sessionDrhInfo)) {
                        $isDrhRelatedToSession = true;
                        break;
                    }
                    foreach ($session['courses'] as $course) {
                        $coachList = SessionManager::getCoachesByCourseSession(
                            $sessionId,
                            $course['real_id']
                        );
                        if (!empty($coachList) && in_array($currentUserId, $coachList)) {
                            $isCourseCoach = true;
                            break 2;
                        }
                    }
                }
            }

            $isCareTaker = $isDrhRelatedViaPost && $isDrhRelatedToSession;

            $isAllow = $isAdmin || $isCareTaker || $isDrhRelatedToSession || $isCourseCoach;
            $showPrivate = $isAdmin || $isCareTaker;
        }

        return [
            'is_allow' => $isAllow,
            'show_private' => $showPrivate,
        ];
    }

    /**
     * @param string $status
     * @param int    $currentUserId
     * @param int    $sessionId
     * @param int    $start
     * @param int    $limit
     *
     * @return array
     */
    public static function getUsers($status, $currentUserId, $sessionId, $start, $limit)
    {
        $sessions = [];
        $courses = [];
        $sessionsFull = [];

        switch ($status) {
            case COURSEMANAGER:
                $sessionsFull = SessionManager::getSessionsCoachedByUser($currentUserId);
                $sessions = array_column($sessionsFull, 'id');
                if (!empty($sessionId)) {
                    $sessions = [$sessionId];
                }
                // Get session courses where I'm coach
                $courseList = SessionManager::getCoursesListByCourseCoach($currentUserId);
                $courses = [];
                /** @var SessionRelCourseRelUser $courseItem */
                foreach ($courseList as $courseItem) {
                    $courses[] = $courseItem->getCourse()->getId();
                }
                break;
            case DRH:
                $sessionsFull = SessionManager::get_sessions_followed_by_drh($currentUserId);
                $sessions = array_column($sessionsFull, 'id');

                if (!empty($sessionId)) {
                    $sessions = [$sessionId];
                }
                $courses = [];
                foreach ($sessions as $sessionId) {
                    $sessionDrhInfo = SessionManager::getSessionFollowedByDrh(
                        $currentUserId,
                        $sessionId
                    );
                    if ($sessionDrhInfo && isset($sessionDrhInfo['course_list'])) {
                        $courses = array_merge($courses, array_column($sessionDrhInfo['course_list'], 'id'));
                    }
                }
                break;
        }

        $userList = SessionManager::getUsersByCourseAndSessionList(
            $sessions,
            $courses,
            $start,
            $limit
        );

        return [
            'users' => $userList,
            'sessions' => $sessionsFull,
        ];
    }

    /**
     * @return int
     */
    public static function getPageSize()
    {
        return 20;
    }

    /**
     * @param int $userId
     */
    public function doWhenDeletingUser($userId)
    {
        $userId = (int) $userId;

        Database::query("DELETE FROM sfu_post WHERE user_id = $userId");
        Database::query("DELETE FROM sfu_post WHERE insert_user_id = $userId");
    }
}