<?php
/**
 * @package       Bicycle
 * @author        Egor Isaev
 * @description   Request.php
 * @copyright (c) 03/06/2026
 */

namespace System\Classes;

use System\Classes\HTTP\HTTPException;
use System\Classes\HTTP\Request as HTTPRequest;

class Request implements HTTPRequest
{
    public static ?self $initial = null;
    public static ?self $current = null;

    private string  $_uri;
    private string  $_controller     = 'Index';
    private string  $_action         = 'index';
    private array   $_params         = [];
    private string  $_method         = HTTPRequest::GET;
    private array   $_post           = [];
    private array   $_get            = [];
    private ?string $_body           = null;
    private string  $_requested_with = '';

    private function __construct(string $uri)
    {
        $this->_uri = $uri;
        $route = Route::resolve($uri);
        $this->_controller = $route['controller'];
        $this->_action     = $route['action'];
        $this->_params     = $route['params'];
    }

    public static function factory(): static
    {
        $uri      = self::detect_uri();
        $instance = new static($uri);

        if (self::$initial === null) {
            self::$initial = $instance;
        }
        self::$current = $instance;

        $instance->method($_SERVER['REQUEST_METHOD'] ?? HTTPRequest::GET);
        $instance->query($_GET);
        $instance->post($_POST);
        $instance->_requested_with = strtolower($_SERVER['HTTP_X_REQUESTED_WITH'] ?? '');

        if ($instance->method() !== HTTPRequest::GET) {
            $body = file_get_contents('php://input');
            if ($body !== false && $body !== '') {
                $instance->body($body);
            }
        }

        return $instance;
    }

    public static function detect_uri(): string
    {
        if (!empty($_SERVER['PATH_INFO'])) {
            $uri = $_SERVER['PATH_INFO'];
        } elseif (isset($_SERVER['REQUEST_URI'])) {
            $uri = $_SERVER['REQUEST_URI'];
            if ($path = parse_url($_SERVER['REQUEST_URI'], PHP_URL_PATH)) {
                $uri = $path;
            }
            $uri = rawurldecode($uri);
        } elseif (isset($_SERVER['PHP_SELF'])) {
            $uri = $_SERVER['PHP_SELF'];
        } else {
            $uri = '/';
        }

        return trim($uri, '/');
    }

    public function execute(): Response
    {
        $method = lcfirst($this->_action) . 'Action';
        $parts  = explode('/', $this->_controller);
        $file   = DOCROOT . '/App/Controller/' . implode('/', array_map('ucfirst', $parts)) . 'Controller.php';

        if (!file_exists($file)) {
            return HTTPException::factory(404)->get_response();
        }

        require_once $file;

        $class = 'App\\Controller\\' . implode('\\', array_map('ucfirst', $parts)) . 'Controller';

        if (!method_exists($class, $method)) {
            return HTTPException::factory(404)->get_response();
        }

        return (new Response())->body((new $class())->$method());
    }

    public function method(?string $method = null): string|static
    {
        if ($method === null) {
            return $this->_method;
        }
        $this->_method = strtoupper($method);
        return $this;
    }

    public function post(null|string|array $key = null, mixed $value = null): null|array|string|static
    {
        if (is_array($key)) {
            $this->_post = $key;
            return $this;
        }
        if ($key === null) {
            return $this->_post;
        }
        if ($value === null) {
            return $this->_post[$key] ?? null;
        }
        $this->_post[$key] = $value;
        return $this;
    }

    public function query(null|string|array $key = null, mixed $value = null): null|array|string|static
    {
        if (is_array($key)) {
            $this->_get = $key;
            return $this;
        }
        if ($key === null) {
            return $this->_get;
        }
        if ($value === null) {
            return $this->_get[$key] ?? null;
        }
        $this->_get[$key] = $value;
        return $this;
    }

    public function body(?string $content = null): string|static
    {
        if ($content === null) {
            return $this->_body ?? '';
        }
        $this->_body = $content;
        return $this;
    }

    public function requested_with(?string $value = null): string|static
    {
        if ($value === null) {
            return $this->_requested_with;
        }
        $this->_requested_with = strtolower($value);
        return $this;
    }

    public function is_ajax(): bool
    {
        return $this->_requested_with === 'xmlhttprequest';
    }

    public function controller(): string { return $this->_controller; }
    public function action(): string     { return $this->_action; }
    public function params(): array      { return $this->_params; }
    public function uri(): string        { return $this->_uri; }

    public function param(int $index, mixed $default = null): mixed
    {
        return $this->_params[$index] ?? $default;
    }
}