<?php
namespace Libs;

use Libs\Request;

class Router{
  private static $get = [];
  private static $post = [];
  private static $put = [];
  private static $delete = [];
  private static $last;
  
  private function __construct(){}
  
  private static function parse($path, $callback){
    $path = preg_quote($path, '/');
    $path = preg_replace(
            ['/\\\{[\w-]+\\\}/s'],
            ['([^\/]+)'],
            $path);
    
    if (!is_callable($callback)) {
      $callback = 'Controllers\\'.$callback;
    }
    return [
      'path'=> $path,
      'callback' => $callback
    ];
  }
  
  public static function baseURI(){
    return str_replace($_SERVER['DOCUMENT_ROOT'],'/', ROOT_DIR);
  }
  
  public static function redirect($uri){
    header('Location: '.self::baseURI().substr($uri,1));
  }
  
  public static function middleware($middleware){ // Solo soporta un middleware a la vez
    if (!isset(self::$last)) return;
    
    $method = self::$last[0];
    $index = self::$last[1];
    
    self::$$method[$index]['middleware'] = 'Middlewares\\'.$middleware;
  }

  public static function get($path, $callback){
    self::$get[] = self::parse($path, $callback);
    self::$last = ['get', count(self::$get)-1];
    return new static();
  }
  
  private static function params(){
    $args             = (object) '';
    $args->get        = new Params($_GET);
    $args->post       = new Params($_POST);
    $args->json       = new Params(self::get_json());
    return $args;
  }
  
  private static function get_json(){
    $contentType = isset($_SERVER["CONTENT_TYPE"]) ? trim($_SERVER["CONTENT_TYPE"]) : '';
    if ($contentType === "application/json"){
      return json_decode(trim(file_get_contents("php://input")));
    }
    return (object) '';
  }
  
  public static function post($path, $callback){
    self::$post[] = self::parse($path, $callback);
    self::$last   = ['post', count(self::$post)-1];
    return new static();
  }
  
  public static function put($path, $callback){
    self::$put[]  = self::parse($path, $callback);
    self::$last   = ['put', count(self::$put)-1];
    return new static();
  }
  
  public static function delete($path, $callback){
    self::$delete[] = self::parse($path, $callback);
    self::$last     = ['delete', count(self::$put)-1];
    return new static();
  }
  
  public static function apply(){
    $uri =  preg_replace('/'.preg_quote(self::baseURI(), '/').'/',
            '/', strtok($_SERVER['REQUEST_URI'], '?'), 1);
    $routers = [];
    switch ($_SERVER['REQUEST_METHOD']){
      case 'POST':
        $routers = self::$post;
        break;
      case 'PUT':
        $routers = self::$put;
        break;
      case 'DELETE':
        $routers = self::$delete;
        break;
      default:
        $routers = self::$get;
        break;
    }
    
    foreach ($routers as $router){
      if (preg_match_all('/^'.$router['path'].'\/?$/si',$uri, $matches)){
        unset($matches[0]);
        $args = self::params();
        
        if (isset($matches[1])){
          $params = [];
          foreach ($matches as $match){
            if (!empty($match))
              $params[] = "$match[0]";
          }
          
          if (isset($router['middleware'])){
            $middleware = explode('::',$router['middleware']);
            $data = call_user_func_array($middleware, [$router['callback'], $args, $params]);
          }else
            $params[] = $args;
            $data = call_user_func_array($router['callback'], $params);  
        }else{
          if (isset($router['middleware'])){
            $middleware = explode('::',$router['middleware']);
            $data = call_user_func_array($middleware, [$router['callback'], $args]);
          }else
            $data = call_user_func_array($router['callback'], [$args]);
        }
        
        if (isset($data)){
          header('Content-Type: application/json');
          print(json_encode($data));
        }
        
        return;
      }
    }
    header("HTTP/1.0 404 Not Found");
    echo '<h2 style="text-align: center;margin: 25px 0px;">Error 404 - Página no encontrada</h2>';
  }
}