<?php

declare(strict_types=1);

namespace Core;

class Request
{
    private string $method;
    private string $path;
    private array $headers;
    private array $queryParams;
    private array $body;
    private string $rawBody;

    public function __construct()
    {
        $this->method = strtoupper($_SERVER['REQUEST_METHOD'] ?? 'GET');
        $uri = $_SERVER['REQUEST_URI'] ?? '/';
        $this->path = parse_url($uri, PHP_URL_PATH) ?: '/';
        $this->queryParams = $_GET ?? [];
        $this->headers = $this->extractHeaders();

        $this->rawBody = file_get_contents('php://input') ?: '';
        $contentType = $this->getHeader('content-type');

        if (str_contains($contentType, 'application/json') && !empty($this->rawBody)) {
            $decoded = json_decode($this->rawBody, true);
            $this->body = is_array($decoded) ? $decoded : [];
        } else {
            $this->body = $_POST ?? [];
        }
    }

    private function extractHeaders(): array
    {
        $headers = [];
        foreach ($_SERVER as $key => $value) {
            if (str_starts_with($key, 'HTTP_')) {
                $headerName = strtolower(str_replace('_', '-', substr($key, 5)));
                $headers[$headerName] = (string)$value;
            } elseif (in_array($key, ['CONTENT_TYPE', 'CONTENT_LENGTH'], true)) {
                $headerName = strtolower(str_replace('_', '-', $key));
                $headers[$headerName] = (string)$value;
            }
        }
        return $headers;
    }

    public function getMethod(): string
    {
        return $this->method;
    }

    public function getPath(): string
    {
        return $this->path;
    }

    public function getHeader(string $name, string $default = ''): string
    {
        $name = strtolower($name);
        return $this->headers[$name] ?? $default;
    }

    public function getHeaders(): array
    {
        return $this->headers;
    }

    public function getQueryParams(): array
    {
        return $this->queryParams;
    }

    public function getQuery(string $key, $default = null)
    {
        return $this->queryParams[$key] ?? $default;
    }

    public function getBody(): array
    {
        return $this->body;
    }

    public function get(string $key, $default = null)
    {
        return $this->body[$key] ?? $default;
    }

    public function getRawBody(): string
    {
        return $this->rawBody;
    }

    public function getIp(): string
    {
        if (!empty($_SERVER['HTTP_CF_CONNECTING_IP'])) {
            return $_SERVER['HTTP_CF_CONNECTING_IP'];
        }
        if (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
            $ips = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);
            return trim($ips[0]);
        }
        return $_SERVER['REMOTE_ADDR'] ?? '127.0.0.1';
    }

    public function getUserAgent(): string
    {
        return $_SERVER['HTTP_USER_AGENT'] ?? 'Unknown';
    }
}