<?php
/***************************************************************************
 *  Copyright (C) 2003-2010 Polytechnique.org                              *
 *  http://opensource.polytechnique.org/                                   *
 *                                                                         *
 *  This program is free software; you can redistribute it and/or modify   *
 *  it under the terms of the GNU General Public License as published by   *
 *  the Free Software Foundation; either version 2 of the License, or      *
 *  (at your option) any later version.                                    *
 *                                                                         *
 *  This program is distributed in the hope that it will be useful,        *
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of         *
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the          *
 *  GNU General Public License for more details.                           *
 *                                                                         *
 *  You should have received a copy of the GNU General Public License      *
 *  along with this program; if not, write to the Free Software            *
 *  Foundation, Inc.,                                                      *
 *  59 Temple Place, Suite 330, Boston, MA  02111-1307  USA                *
 ***************************************************************************/

abstract class PLModule
{
    /** Path of the includes of the module
     * Internal use only.
     */
    private $modIncludePath;

    /** Return an array associating pathes to the corresponding hook.
     * array( '/my/path' => make_hook(...),
     *        ...);
     * @ref make_hook
     */
    abstract public function handlers();

    /** Register a hook
     * @param fun name of the handler (the exact name will be handler_$fun)
     * @param auth authentification level of needed to run this handler
     * @param perms permission required to run this handler
     * @param type additionnal flags
     *
     * Perms syntax is the following:
     * perms = rights(,rights)*
     * rights = right(:right)*
     * right is an atomic right permission (like 'admin', 'user', 'groupadmin', 'groupmember'...)
     *
     * If type is set to NO_AUTH, the system will return 403 instead of asking auth data
     * this is useful for Ajax handler
     * If type is not set to NO_SKIN, the system will consider redirecting the user to https
     */
    public function make_hook($fun, $auth, $perms = 'user', $type = DO_AUTH)
    {
        return new PlStdHook(array($this, 'handler_' . $fun),
                             $auth, $perms, $type);
    }

    /** Register a hook that points to a wiki page.
     */
    public function make_wiki_hook($auth = AUTH_PUBLIC, $perms = 'user', $type = DO_AUTH)
    {
        return new PlWikiHook($auth, $perms, $type);
    }

    /** Include a 'module-specific' file.
     * Module specific includes must be in the in the path modules/{modulename}.
     */
    public function load($file)
    {
        require_once $this->modIncludePath . $file;
    }

    /* static functions */

    public static function path($modname)
    {
        global $globals;
        if ($modname == 'core') {
            $mod_path = $globals->spoolroot  . '/core/modules/' . $modname;
        } else {
            $mod_path = $globals->spoolroot . '/modules/' . $modname;
        }
        return $mod_path;
    }

    public static function factory($modname)
    {
        $mod_path = self::path($modname);
        $class    = ucfirst($modname) . 'Module';

        require_once $mod_path . '.php';
        $module = new $class();
        $module->modIncludePath = $mod_path . '/';
        return $module;
    }
}

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?>