<?php

declare(strict_types=1);

namespace Monitor\Api\Http;

final class Request
{
    /** @param array<string, string> $headers */
    private function __construct(
        public readonly string $method,
        public readonly string $path,
        public readonly array $query,
        public readonly array $body,
        private readonly array $headers,
    ) {
    }

    public static function fromGlobals(): self
    {
        $method = strtoupper($_SERVER['REQUEST_METHOD'] ?? 'GET');
        $uri = $_SERVER['REQUEST_URI'] ?? '/';
        $path = rtrim((string) parse_url($uri, PHP_URL_PATH), '/');
        if ($path === '') {
            $path = '/';
        }

        parse_str((string) (parse_url($uri, PHP_URL_QUERY) ?? ''), $query);

        $rawBody = file_get_contents('php://input') ?: '';
        $body = [];
        if ($rawBody !== '') {
            $decoded = json_decode($rawBody, true);
            if (is_array($decoded)) {
                $body = $decoded;
            }
        }

        $headers = [];
        foreach ($_SERVER as $key => $value) {
            if (str_starts_with($key, 'HTTP_')) {
                $name = str_replace('_', '-', strtolower(substr($key, 5)));
                $headers[$name] = (string) $value;
            }
        }
        if (isset($_SERVER['CONTENT_TYPE'])) {
            $headers['content-type'] = (string) $_SERVER['CONTENT_TYPE'];
        }

        return new self($method, $path, $query, $body, $headers);
    }

    /** @param array<string, mixed> $body */
    public static function create(string $method, string $path, array $query = [], array $body = [], array $headers = []): self
    {
        $normalized = [];
        foreach ($headers as $name => $value) {
            $normalized[strtolower($name)] = $value;
        }

        return new self($method, rtrim($path, '/') ?: '/', $query, $body, $normalized);
    }

    public function header(string $name): ?string
    {
        return $this->headers[strtolower($name)] ?? null;
    }
}