<?php

declare(strict_types=1);

namespace App\Core\Http;

class Request
{
    private string $method;
    private string $uri;
    private string $path;
    private array $queryParams;
    private array $bodyParams;
    private array $headers;

    public function __construct()
    {
        $this->method = strtoupper($_SERVER['REQUEST_METHOD'] ?? 'GET');
        
        // Handle method overriding via _method for forms (PUT/DELETE/PATCH)
        if ($this->method === 'POST' && isset($_POST['_method'])) {
            $this->method = strtoupper($_POST['_method']);
        }

        $this->uri = $_SERVER['REQUEST_URI'] ?? '/';
        $parsedUrl = parse_url($this->uri);
        $this->path = $parsedUrl['path'] ?? '/';
        
        // Trim trailing slash for consistent routing (except root)
        if ($this->path !== '/' && str_ends_with($this->path, '/')) {
            $this->path = rtrim($this->path, '/');
        }

        $this->queryParams = $_GET;

        // Safely extract headers in all SAPIs
        if (function_exists('getallheaders')) {
            $this->headers = getallheaders() ?: [];
        } else {
            $this->headers = [];
            foreach ($_SERVER as $name => $value) {
                if (str_starts_with($name, 'HTTP_')) {
                    $headerName = str_replace(' ', '-', ucwords(strtolower(str_replace('_', ' ', substr($name, 5)))));
                    $this->headers[$headerName] = $value;
                } elseif (in_array($name, ['CONTENT_TYPE', 'CONTENT_LENGTH'], true)) {
                    $headerName = str_replace(' ', '-', ucwords(strtolower(str_replace('_', ' ', $name))));
                    $this->headers[$headerName] = $value;
                }
            }
        }

        // Parse JSON or form POST body
        $contentType = $_SERVER['CONTENT_TYPE'] ?? '';
        if (str_contains($contentType, 'application/json')) {
            $rawBody = file_get_contents('php://input');
            $this->bodyParams = json_decode($rawBody, true) ?: [];
        } else {
            $this->bodyParams = $_POST;
        }
    }

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

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

    public function getUri(): string
    {
        return $this->uri;
    }

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

    public function post(string $key, mixed $default = null): mixed
    {
        return $this->bodyParams[$key] ?? $default;
    }

    public function all(): array
    {
        return array_merge($this->queryParams, $this->bodyParams);
    }

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

    public function getHeader(string $name, ?string $default = null): ?string
    {
        $name = strtolower($name);
        foreach ($this->headers as $key => $value) {
            if (strtolower($key) === $name) {
                return $value;
            }
        }
        return $default;
    }

    public function isJson(): bool
    {
        $contentType = $_SERVER['CONTENT_TYPE'] ?? '';
        $accept = $_SERVER['HTTP_ACCEPT'] ?? '';
        return str_contains($contentType, 'application/json') || str_contains($accept, 'application/json');
    }
}