<?php
header('Content-Type: application/json');
header('Access-Control-Allow-Origin: *');
header('Access-Control-Allow-Methods: GET, POST, PUT, DELETE, OPTIONS');
header('Access-Control-Allow-Headers: Content-Type, Authorization');

// Handle preflight OPTIONS requests
if ($_SERVER['REQUEST_METHOD'] === 'OPTIONS') {
    http_response_code(200);
    exit();
}

require_once 'TodoController.php';

$controller = new TodoController();

// Get the request URI and method
$request_uri = $_SERVER['REQUEST_URI'];
$request_method = $_SERVER['REQUEST_METHOD'];

// Remove query string if present
$path = strtok($request_uri, '?');

// Remove trailing slash if present
$path = rtrim($path, '/');

// If path is empty, set to root
if (empty($path)) {
    $path = '/';
}

// Route handling
switch ($path) {
    case '/':
        // Base route - show available endpoints
        if ($request_method === 'GET') {
            $host = $_SERVER['HTTP_HOST'];
            $port = $_SERVER['SERVER_PORT'];
            $protocol = isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] === 'on' ? 'https' : 'http';
            
            echo json_encode([
                'message' => "Todo API running at {$protocol}://{$host}:{$port}/",
                'available_endpoints' => [
                    'GET /todos - Get all todos',
                    'POST /todos - Create todo',
                    'PUT /todos/:id - Update todo',
                    'DELETE /todos/:id - Delete todo'
                ]
            ], JSON_PRETTY_PRINT);
        } else {
            http_response_code(405);
            echo json_encode(['error' => 'Method not allowed']);
        }
        break;
        
    case '/todos':
        switch ($request_method) {
            case 'GET':
                $controller->getAllTodos();
                break;
            case 'POST':
                $controller->createTodo();
                break;
            default:
                http_response_code(405);
                echo json_encode(['error' => 'Method not allowed']);
        }
        break;
        
    default:
        // Handle /todos/:id routes
        if (preg_match('/^\/todos\/(\d+)$/', $path, $matches)) {
            $id = (int)$matches[1];
            
            switch ($request_method) {
                case 'PUT':
                    $controller->updateTodo($id);
                    break;
                case 'DELETE':
                    $controller->deleteTodo($id);
                    break;
                default:
                    http_response_code(405);
                    echo json_encode(['error' => 'Method not allowed']);
            }
        } else {
            http_response_code(404);
            echo json_encode(['error' => 'Endpoint not found']);
        }
}
?>