<?php
class Route
{

    private static $routes = [];
    private static $pathNotFound = null;
    private static $methodNotAllowed = null;

    public static function add($expression, $function, $method = 'get')
    {
        array_push(self::$routes, [
            'expression' => $expression,
            'function' => $function,
            'method' => $method
        ]);
    }

    public static function pathNotFound($function)
    {
        self::$pathNotFound = $function;
    }

    public static function methodNotAllowed($function)
    {
        self::$methodNotAllowed = $function;
    }

    public static function run($basepath = '/')
    {

        // Parse current url
        $parsed_url = parse_url($_SERVER['REQUEST_URI']); //Parse Uri
        if (isset($parsed_url['path']))
        {
            $path = $parsed_url['path'];
        }
        else
        {
            $path = '/';
        }

        // Get current request method
        $method = $_SERVER['REQUEST_METHOD'];

        $path_match_found = false;

        $route_match_found = false;

        foreach (self::$routes as $route)
        {

            // If the method matches check the path
            // Add basepath to matching string
            if ($basepath != '' && $basepath != '/')
            {
                $route['expression'] = '(' . $basepath . ')' . $route['expression'];
            }

            // Add 'find string start' automatically
            $route['expression'] = '^' . $route['expression'];

            // Add 'find string end' automatically
            $route['expression'] = $route['expression'] . '$';

            // echo $route['expression'].'<br/>';
            // Check path match
            if (preg_match('#' . $route['expression'] . '#', $path, $matches))
            {

                $path_match_found = true;

                // Check method match
                if (strtolower($method) == strtolower($route['method']))
                {

                    array_shift($matches); // Always remove first element. This contains the whole string
                    if ($basepath != '' && $basepath != '/')
                    {
                        array_shift($matches); // Remove basepath

                    }

                    call_user_func_array($route['function'], $matches);

                    $route_match_found = true;

                    // Do not check other routes
                    break;
                }
            }
        }

        // No matching route was found
        if (!$route_match_found)
        {

            // But a matching path exists
            if ($path_match_found)
            {
                header("HTTP/1.0 405 Method Not Allowed");
                if (self::$methodNotAllowed)
                {
                    call_user_func_array(self::$methodNotAllowed, Array(
                        $path,
                        $method
                    ));
                }
            }
            else
            {
                header("HTTP/1.0 404 Not Found");
                if (self::$pathNotFound)
                {
                    call_user_func_array(self::$pathNotFound, Array(
                        $path
                    ));
                }
            }

        }

    }

}