<?php
/**
 * Gestion de la requête entrante
 */

declare(strict_types=1);

class Request
{
    private string $method;
    private string $uri;
    private array $params = [];
    private array $body = [];
    private array $headers = [];

    public function __construct()
    {
        $this->method = $_SERVER['REQUEST_METHOD'];
        $this->uri = $this->parseUri();
        $this->headers = $this->parseHeaders();
        $this->body = $this->parseBody();
    }

    private function parseUri(): string
    {
        $uri = $_SERVER['REQUEST_URI'] ?? '/';

        // Retirer le query string
        if (($pos = strpos($uri, '?')) !== false) {
            $uri = substr($uri, 0, $pos);
        }

        // Retirer le préfixe /api si présent
        $uri = preg_replace('#^/api#', '', $uri);

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

    private function parseHeaders(): array
    {
        $headers = [];
        foreach ($_SERVER as $key => $value) {
            if (str_starts_with($key, 'HTTP_')) {
                $name = str_replace('_', '-', substr($key, 5));
                $headers[$name] = $value;
            }
        }
        return $headers;
    }

    private function parseBody(): array
    {
        if (in_array($this->method, ['POST', 'PUT', 'PATCH'])) {
            $input = file_get_contents('php://input');
            if (!empty($input)) {
                $decoded = json_decode($input, true);
                if (json_last_error() === JSON_ERROR_NONE && is_array($decoded)) {
                    return $decoded;
                }
            }
            // Fallback sur $_POST ou array vide
            return $_POST ?: [];
        }
        return [];
    }

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

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

    public function getHeader(string $name): ?string
    {
        $name = strtoupper(str_replace('-', '_', $name));
        return $this->headers[$name] ?? null;
    }

    public function getSessionId(): ?string
    {
        return $this->getHeader('X-SESSION-ID');
    }

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

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

    public function setParams(array $params): void
    {
        $this->params = $params;
    }

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

    public function getParams(): array
    {
        return $this->params;
    }
}