<?php
/**
 * DokuWiki Plugin joomla3 (Auth Component)
 *
 * @license GPL 2 http://www.gnu.org/licenses/gpl-2.0.html
 * @author  Jury Verrigni <jury.verrigni@skayahack.com>
 */

if (!defined('DOKU_INC')) {
    die();
}

/**
 * Class auth_plugin_authjoomla3
 */
class auth_plugin_authjoomla3 extends auth_plugin_authpdo
{
    protected $joomlaPath = '';
    protected $joomlaConfig = array();

    /**
    * Before calling AuthPDO's construct we want to override database's
    * settings with Joomla's ones
    **/
    public function __construct()
    {
        $this->joomlaPath = $this->getConf('joomlaPath');

        if ($this->joomlaPath == ''
            || !is_dir($this->joomlaPath)
            || !file_exists($this->joinPaths($this->joomlaPath, 'configuration.php'))) {
            $this->_debug('Joomla not found at the specified path.', -1, __LINE__);
            $this->success = false;
            return;
        }

        $this->setupPdoConfig();

        parent::__construct();
    }

    /**
    * After fetching user's groups we want to rename Joomla's default
    * Administrator and Super Users to admin in order to make them automatically
    * admin on DokuWiki
    **/
    protected function _selectUserGroups($userdata)
    {
        $groups = parent::_selectUserGroups($userdata);
        foreach ($groups as &$group) {
            if (in_array($group, array('Administrator', 'Super Users'))) {
                $group = 'admin';
            }
        }
        return $groups;
    }

    /**
    * Here we override PDO's config with Joomla's one.
    * Called from the constructor
    */
    protected function setupPdoConfig()
    {
        require_once $this->joinPaths($this->joomlaPath, 'configuration.php');

        $this->joomlaConfig = new JConfig;
        $this->joomlaConfig->dbtype = str_replace('mysqli', 'mysql', $this->joomlaConfig->dbtype);
        $this->conf['dsn'] = sprintf('%s:dbname=%s;host=%s', $this->joomlaConfig->dbtype, $this->joomlaConfig->db, $this->joomlaConfig->host);
        $this->conf['user'] = $this->joomlaConfig->user;
        $this->conf['pass'] = $this->joomlaConfig->password;

        $this->setupPdoQueries();
    }

    /**
    * These are the queries required from authPDO.
    * Creating/deleting/updating users and groups is done from
    * Joomla itself so we only need to fetch data from the DB.
    */
    protected function setupPdoQueries()
    {
        $this->conf['select-user'] = sprintf('
			SELECT username as user, name, email as mail, password as hash, id as uid
			FROM %s WHERE username = :user',
            $this->getTableName('users'));

        $this->conf['select-user-groups'] = sprintf('
			SELECT title as `group` FROM %s as groups
			LEFT JOIN %s as groupmap ON groups.id = groupmap.group_id
			LEFT JOIN %s as user ON groupmap.user_id = user.id
			WHERE user.username = :user OR user.id = :uid ',
            $this->getTableName('usergroups'),
            $this->getTableName('user_usergroup_map'),
            $this->getTableName('users'));

        $this->conf['select-groups'] = sprintf('
			SELECT title as `group`, id as gid FROM %s',
            $this->getTableName('usergroups'));
    }

    protected function getTableName($name)
    {
        return $this->joomlaConfig->dbprefix . $name;
    }

    protected function joinPaths()
    {
        $args = func_get_args();
        $paths = array();
        foreach ($args as $arg) {
            $paths = array_merge($paths, (array)$arg);
        }
        $paths = array_map(create_function('$p', 'return trim($p, "/");'), $paths);
        $paths = array_filter($paths);
        if (substr($args[0], 0, 1) == '/') {
            $paths[0] = '/' . $paths[0];
        }
        return join('/', $paths);
    }
}