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

/**
 * Redirection plugin. Allows the configuration of redirection of specific users right after they login.
 *
 * @author Enrique Alcaraz Lopez
 *
 * @package chamilo.plugin.redirection
 */
class RedirectionPlugin extends Plugin
{
    public $isAdminPlugin = true;

    /**
     * Class constructor.
     */
    protected function __construct()
    {
        $version = '1.0';
        $author = 'Enrique Alcaraz, Julio Montoya';
        parent::__construct($version, $author, ['enabled' => 'boolean']);
        $this->isAdminPlugin = true;
    }

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

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

    /**
     * Inser a new redirection (and delete the previous one for this user, if any).
     *
     * @param int    $userId
     * @param string $url
     *
     * @return false|string
     */
    public static function insert($userId, $url)
    {
        $userId = (int) $userId;

        if (empty($userId)) {
            return false;
        }

        $sql = "DELETE FROM plugin_redirection WHERE user_id = $userId";
        Database::query($sql);

        $userInfo = api_get_user_info($userId);

        if (empty($userInfo)) {
            return false;
        }

        return Database::insert(
            'plugin_redirection',
            [
                'user_id' => $userId,
                'url' => $url,
            ]
        );
    }

    /**
     * Get the current redirection for a given user (if any).
     *
     * @param int $userId
     *
     * @return array
     */
    public static function getUrlFromUser($userId)
    {
        $userId = (int) $userId;
        $userInfo = api_get_user_info($userId);
        if (empty($userInfo)) {
            return false;
        }
        $sql = "SELECT * FROM plugin_redirection WHERE user_id = $userId LIMIT 1";
        $result = Database::query($sql);

        return Database::fetch_array($result, 'ASSOC');
    }

    /**
     * Deletes redirection from user.
     *
     * @param int $userId
     */
    public static function deleteUserRedirection($userId)
    {
        $table = Database::get_main_table('plugin_redirection');
        Database::delete(
            $table,
            ['user_id = ?' => [$userId]]
        );
    }

    /**
     * Deletes an existing redirection.
     *
     * @param int $id
     */
    public static function delete($id)
    {
        $table = Database::get_main_table('plugin_redirection');
        Database::delete(
            $table,
            ['id = ?' => [$id]]
        );
    }

    /**
     * Get all current redirection records.
     *
     * @return array
     */
    public static function getAll()
    {
        $table = Database::get_main_table('plugin_redirection');

        return Database::select('*', $table);
    }

    /**
     * Install the required DB structure to store the plugin data.
     */
    public static function install()
    {
        $table = Database::get_main_table('plugin_redirection');

        $sql = "CREATE TABLE IF NOT EXISTS $table (
            id INT unsigned NOT NULL auto_increment PRIMARY KEY,
            user_id INT unsigned NOT NULL DEFAULT 0,
            url VARCHAR(255) NOT NULL DEFAULT ''
        )";

        Database::query($sql);
    }

    /**
     * Uninstall the plugin, cleaning up the database structure created on install.
     */
    public static function uninstall()
    {
        $table = Database::get_main_table('plugin_redirection');
        $sql = "DROP TABLE IF EXISTS $table";
        Database::query($sql);
    }

    /**
     * Redirect user if plugin is installed.
     *
     * @param int $userId
     */
    public static function redirectUser($userId)
    {
        // Check redirection plugin
        $plugin = new AppPlugin();
        $pluginList = $plugin->get_installed_plugins();
        $redirectionInstalled = in_array('redirection', $pluginList);
        if ($redirectionInstalled) {
            $pluginInfo = $plugin->getPluginInfo('redirection');
            if (!empty($pluginInfo) && isset($pluginInfo['obj'])) {
                /** @var RedirectionPlugin $redirectionPlugin */
                $redirectionPlugin = $pluginInfo['obj'];
                $record = $redirectionPlugin->getUrlFromUser($userId);
                if (!empty($record) && !empty($record['url'])) {
                    header('Location: '.$record['url']);
                    exit;
                }
            }
        }
    }
}