<?php

namespace BBRouter;

class RouteCollection{

    private static $_route_collection;

    public $_uri = '/';

    public $_routes = Array();

    private $_verb = '';

    private $_loaded_files = Array();

    private $_errors = Array();

    private $_default_middlewares = Array();

    private static $_verbs_whitelist = Array('*', 'GET','POST','PUT','PATCH','DELETE', 'CLI');

    private static $_verbs_web = Array('GET','POST','PUT','PATCH','DELETE');


    //SINGLETON==============================================

    private function __construct(){ }

    private static function newObj(){
        if (!isset(self::$_route_collection)) {
            self::$_route_collection = new RouteCollection();
            if(php_sapi_name() == "cli"){
                self::$_route_collection->_uri = isset( $_SERVER['argv'][1] ) ? '/'. $_SERVER['argv'][1] : '/';
            }else{
                self::$_route_collection->_uri = isset( $_SERVER['REQUEST_URI'] ) ? explode('&', $_SERVER['REQUEST_URI'])[0] : '/';
            }
            self::$_route_collection->define_verb();
        }
        return self::$_route_collection;
    }

    public static function getInstance(){
        if (!isset(self::$_route_collection)) {
            return self::newObj();
        }
        return self::$_route_collection;
    }


    //HELPERS================================================

    /*
     * Find route files with names under pathname
     */
    public function crawl($basepath = __DIR__, $filenames = Array('Routes.php', 'routes.php') ){
        $instance = self::getInstance();

        $rdi = new \RecursiveDirectoryIterator($basepath);

        foreach(new \RecursiveIteratorIterator($rdi) as $file){
            foreach ($filenames as $filename) {
                if( strpos($file, $filename) ){
                    $instance->_loaded_files[] = $file;
                }
            }
        }
        return $instance;
    }

    /*
     * Load the files with the routes
     */
    function load_routes(){
        $instance = self::getInstance();

        foreach ($instance->_loaded_files as $loaded_file){
            include $loaded_file;
        }
        return $instance;
    }

    /*
     * GET | POST | PUT | PATCH | DELETE | CLI
     *
     */
    private function define_verb(){

        $verb = '';

        if(isset($_POST['_method'])){
            $verb = strtoupper( $_POST['_method'] );
        }else if(php_sapi_name() == "cli"){
            $verb = "CLI";
        }else{
            $verb = strtoupper( $_SERVER['REQUEST_METHOD'] );
        }

        if(in_array($verb, self::$_verbs_whitelist)){
            $this->_verb = $verb;
        }else{
            echo 'Invalid Verb';
        }
    }

    /*
     *
     */
    private function sort_routes(){
        usort($this->_routes, function($a, $b){
            if ($a->_weight == $b->_weight) {
                return 0;
            }
            return ($a->_weight < $b->_weight) ? -1 : 1;
        });
    }

    /*
     * Dispatch routes
     */
    function submit(){
        global $ROUTE;

        self::$_route_collection->sort_routes();

        $one_hit = false;

        foreach (self::$_route_collection->_routes as $route){

            if(!in_array( self::$_route_collection->_verb, $route->_verb) && !in_array( '*', $route->_verb) ){
                //No it is not
                continue;
            }

            //Request match a route
            $match = $route->match(self::$_route_collection->_uri);

            if($match){
                //Yup. Execute the route

                $ROUTE = $route;

                $route->_before = $this->_default_middlewares;

                $route->execute();

                if(!$route->_ignore){
                    $one_hit = true;
                }

                if($route->_http_error){
                    $this->http_error($route->_http_error);
                    return;
                }

                //If Executed, interrupt route chain?
                if($route->_block){
                    return;
                }
            }
        }

        if(!$one_hit){
            $info = new \stdClass();
            $info->code = 404;
            $info->message = 'Not Found';
            self::$_route_collection->http_error($info);
        }
    }

    //DEFINITORS=============================================

    static function get($uri, $callback, $weight = 0){
        $route = new Route();
        $route->_verb[] = 'GET';

        $route->_uri = $uri;
        $route->_callback[] = $callback;
        $route->_weight = $weight;
        $route->prepare();

        self::getInstance()->_routes[] = $route;

        return $route;
    }

    static function post($uri, $callback, $weight = 0){
        $route = new Route();
        $route->_verb[] = 'POST';

        $route->_uri = $uri;
        $route->_callback[] = $callback;
        $route->_weight = $weight;
        $route->prepare();

        self::getInstance()->_routes[] = $route;

        return $route;
    }

    static function put($uri, $callback, $weight = 0){
        $route = new Route();
        $route->_verb[] = 'PUT';

        $route->_uri = $uri;
        $route->_callback[] = $callback;
        $route->_weight = $weight;
        $route->prepare();

        self::getInstance()->_routes[] = $route;

        return $route;
    }

    static function patch($uri, $callback, $weight = 0){
        $route = new Route();
        $route->_verb[] = 'PATCH';

        $route->_uri = $uri;
        $route->_callback[] = $callback;
        $route->_weight = $weight;
        $route->prepare();

        self::getInstance()->_routes[] = $route;

        return $route;
    }

    static function delete($uri, $callback, $weight = 0){
        $route = new Route();
        $route->_verb[] = 'DELETE';

        $route->_uri = $uri;
        $route->_callback[] = $callback;
        $route->_weight = $weight;
        $route->prepare();

        self::getInstance()->_routes[] = $route;

        return $route;
    }

    static function resource($uri){
        throw new Exception('Not implemented');
    }

    /*
     *
     */
    static function add($verb, $uri, $callback, $weight = 0){
        $route = new Route();

        if(is_array( $verb ) ){
            $route->_verb = array_map('strtoupper', $verb);
        }else if( strtoupper($verb) == 'WEB' ){
            $route->_verb[] = self::_verbs_web;
        }else{
            $route->_verb[] = strtoupper( $verb );
        }

        $route->_uri = $uri;
        $route->_callback[] = $callback;
        $route->_weight = $weight;
        $route->prepare();

        self::getInstance()->_routes[] = $route;

        return $route;
    }

    /*
     *
     */
    function addRoute(Route $route){
        $this->_routes[] = $route;
    }

    /*
     *
     */
    static function addMiddleware($name = '', $function){
        self::getInstance()->_default_middlewares[$name] = $function;
    }

    /*
     *
     */
    static function on_http_error($function){
        $instance = self::getInstance();
        $instance->_errors[] = $function;
    }

    /*
     *
     */
    private function http_error(\stdClass $info){
        $info = (array) $info;
        foreach ($this->_errors as $error) {
            call_user_func_array($error, $info);
        }


    }
}