<?php

class Router {
  
  private $list_controllers = [];
  
  private $default_controller = null;
  
  private $four_oh_four_controller = null;
  
  public function
  register_controller ($controller_name) {
    if (isset ($list_controllers[$controller_name])) {
      return;
    }
    
    require (APP_DIR . "Controllers" . DS . $controller_name  . ".php");
    
    $this->list_controllers[$controller_name] = $controller_name;
    
  }
  
  public function
  register_404_controller ($controller_name) {
    if (isset($this->four_oh_four_controller)){
      return;
    }
    $this->four_oh_four_controller = $controller_name;
    $this->register_controller ($controller_name);
  }
  
  public function
  register_default_controller ($controller_name) {
    if (isset($this->default_controller)) {
      return;
    }
    $this->default_controller = $controller_name;
    $this->register_controller ($controller_name);
  }
  
  public function
  route () {
    
    $url = "";
    $method = "default_method";
    $ctrl = $this->default_controller;
    $path = "";

    $request_url = '';
    if (isset($_SERVER['REQUEST_URI'])) {
      $request_url = $_SERVER['REQUEST_URI'];
    }
    //echo "Request URL: " . $request_url . "\n";
    $script_url = '';
    if (isset($_SERVER['PHP_SELF'])){
      $script_url = $_SERVER['PHP_SELF'];
    }
    //echo "Script URL: " . $script_url . "\n";
    
    if($request_url != $script_url) {
      $url = trim(preg_replace('/'.
        str_replace('/', '\/',
          str_replace('index.php', '', $script_url))
            .'/', '', $request_url, 1), '/');
      //echo "url: " . $url . "\n";
    }
    
    $parts = explode ('/', $url );
    
    if (isset ($parts[0]) && $parts[0] != '') {
      $ctrl = $parts[0];
    }
    
    if (isset ($parts[1]) && $parts[1] != '') {
      $method = $parts[1];
    }
    
    if(isset ($this->list_controllers[$ctrl])) {
      $controller_obj = new $ctrl ();
      $ctrl_method_list = $controller_obj->get_methods();
      if ($method != "default_method" &&
          isset($ctrl_method_list[$method])) {
        $controller_obj->$ctrl_method_list[$method] (array_slice($parts, 2));
        return;
      }
      $controller_obj->default_method (NULL);
      return;
    }
    
    $controller_obj = new $this->four_oh_four_controller ();
    $controller_obj->default_method ($url);
    
  }
}