<?php
declare(strict_types=1);

require_once dirname(__DIR__) . '/src/bootstrap.php';

$method = strtoupper($_SERVER['REQUEST_METHOD'] ?? 'GET');
$uri = parse_url($_SERVER['REQUEST_URI'] ?? '/', PHP_URL_PATH) ?: '/';
$uri = rtrim($uri, '/') ?: '/';

try {
    if ($uri === '/api/v1/health') {
        Database::pdo()->query('SELECT 1');
        JsonResponse::ok([
            'status' => 'ok',
            'service' => 'url-shortener',
            'db' => 'connected',
        ]);
    }

    if ($uri === '/api/v1/shorten') {
        if ($method === 'GET') {
            $result = ShortenService::handle(
                (string) ($_GET['url'] ?? ''),
                (string) ($_GET['bearer'] ?? ''),
                (string) ($_GET['signer'] ?? ''),
                isset($_GET['ttl']) ? (int) $_GET['ttl'] : null
            );
        } elseif ($method === 'POST') {
            $raw = file_get_contents('php://input') ?: '';
            $body = json_decode($raw, true);
            if (!is_array($body)) {
                JsonResponse::error(400, 'INVALID_URL', 'expected JSON body');
            }
            $result = ShortenService::handle(
                (string) ($body['url'] ?? ''),
                (string) ($body['bearer'] ?? ''),
                (string) ($body['signer'] ?? ''),
                isset($body['ttl']) ? (int) $body['ttl'] : null
            );
        } else {
            JsonResponse::error(405, 'INTERNAL', 'method not allowed');
        }
        $http = (int) ($result['http'] ?? 200);
        unset($result['http']);
        if (($result['code'] ?? '') === '0') {
            JsonResponse::ok($result, $http);
        }
        JsonResponse::error($http, (string) $result['code'], (string) $result['desc'], [
            'url' => $result['url'] ?? '',
            'bearer' => $result['bearer'] ?? '',
        ]);
    }

    if (preg_match('#^/api/v1/qr/([a-f0-9]{6,16})\.png$#', $uri, $m)) {
        $size = isset($_GET['size']) ? (int) $_GET['size'] : 256;
        QrHandler::handle($m[1], $size);
    }

    if (preg_match('#^/([a-f0-9]{6,16})$#', $uri, $m)) {
        if ($method === 'GET' || $method === 'HEAD') {
            RedirectHandler::handle($m[1], $method);
        }
        JsonResponse::error(405, 'INTERNAL', 'method not allowed');
    }

    http_response_code(404);
    header('Content-Type: application/json; charset=utf-8');
    echo json_encode(['code' => 'NOT_FOUND', 'desc' => 'not found'], JSON_UNESCAPED_SLASHES);
} catch (Throwable $e) {
    error_log('url-shortener: ' . $e->getMessage());
    JsonResponse::error(500, 'INTERNAL', 'server error');
}