<?php

/*
 * SCROTT Copyright (C) 2016 Malf Furious
 *
 * Scrott 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 3 of the License,
 * or (at your option) any later version.
 *
 * Scrott is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
 * License for more details.
 */

/* Define Scrott version number */
define("__VERSION__", "v0.0");

/* Include the Scrott system-level configuration file if it exists */
is_file("scrott.conf.php") &&
    require_once "scrott.conf.php";

/* Init PHP session */
session_start();

require_once "class/mysql.class.php";
require_once "class/user.class.php";

/*
 * Global functions / operations and access to contextual or session-based information
 */
abstract class Framework
{
    static $dbobj = null;

    /*
     * Check for the existence of Scrott's system-level config
     */
    function scrottConfExists()
    {
        global $_SCROTT;
        return isset($_SCROTT['conf']);
    }

    /*
     * Get the absolute path on this server for the root of this app
     */
    function ar()
    {
        return substr($_SERVER['PHP_SELF'], 0, -10); // 10 = length of "/index.php"
    }

    /*
     * Get the absolute path to the current page
     */
    function ap()
    {
        return $this->ar() . $_REQUEST['path'];
    }

    /*
     * Redirect to the given URL and die
     */
    function redirectTo($url)
    {
        header("Location: " . $url);
        exit;
    }

    /*
     * Get a user object for the currently logged in user.  Returns false if session is logged out.
     */
    function getCurrentUser()
    {
        if (isset($_SESSION['userguid']))
        {
            $user = new User($_SESSION['userguid']);

            if ($user->type == "user")
                return $user;

            $this->setCurrentUser();
        }

        return false;
    }

    /*
     * Get the IP address the client held when the current session began
     */
    function getOriginIP()
    {
        return $_SESSION['userip'];
    }

    /*
     * Set the current logged in user
     */
    function setCurrentUser($user = null)
    {
        if ($user != null && isset($user->guid))
        {
            $_SESSION['userguid'] = $user->guid;
            $_SESSION['userip'] = $_SERVER['REMOTE_ADDR'];
        }

        else
        {
            unset($_SESSION['userguid']);
            unset($_SESSION['userip']);
        }
    }

    /*
     * Get or create the app's database connection object (this is a singleton object and dependent on system-level config)
     */
    static function getDbConnection()
    {
        global $_SCROTT;

        if (self::$dbobj != null)
            return self::$dbobj;

        switch ($_SCROTT['dbEngine'])
        {
        case "mysql":
            $host     = $_SCROTT['dbAddress'];
            $username = $_SCROTT['dbUser'];
            $password = $_SCROTT['dbPass'];
            $dbName   = $_SCROTT['dbName'];
            self::$dbobj = new Mysql($host, $username, $password, $dbName);
            break;

        default:
            throw new Exception("Problem with Scrott Configuration. Invalid database engine specified.");
            break;
        }

        return self::$dbobj;
    }
}

?>