<?php

namespace App\Core;

use App\Core\Router;
use App\Core\Container;
use App\Core\Middleware;
use App\Core\Security;

/**
 * NovaCore Framework Bootstrap
 * Main application kernel
 */
class Bootstrap
{
    private Container $container;
    private Router $router;
    private Middleware $middleware;
    private Security $security;

    public function __construct()
    {
        $this->container = new Container();
        $this->router = new Router();
        $this->middleware = new Middleware();
        $this->security = new Security();

        // Set the global container so helpers can use it
        app_set_container($this->container);

        $this->registerServices();
        $this->loadRoutes();
        $this->setupMiddleware();
    }

    /**
     * Run the application
     */
    public function run(): void
    {
        // Start session
        if (session_status() === PHP_SESSION_NONE) {
            session_start();
        }

        // Initialize security
        $this->security->initialize();

        // Get request method and URI
        $method = $_SERVER['REQUEST_METHOD'] ?? 'GET';
        $uri = parse_url($_SERVER['REQUEST_URI'] ?? '/', PHP_URL_PATH);

        // Run middleware pipeline
        $this->middleware->run($method, $uri);

        // Route the request
        $route = $this->router->match($method, $uri);

        if (!$route) {
            $this->handleNotFound();
            return;
        }

        // Execute controller
        $this->executeController($route);
    }

    /**
     * Register services in container
     */
    private function registerServices(): void
    {
        $this->container->singleton('request', function () {
            return new Request();
        });

        $this->container->singleton('response', function () {
            return new Response();
        });

        $this->container->singleton('view', function () {
            return new View();
        });

        $this->container->singleton('security', function () {
            return $this->security;
        });
    }

    /**
     * Load routes from all modules
     */
    private function loadRoutes(): void
    {
        $modulesPath = __DIR__ . '/../Modules';

        if (is_dir($modulesPath)) {
            $modules = scandir($modulesPath);
            foreach ($modules as $module) {
                if ($module === '.' || $module === '..') continue;

                $routesFile = $modulesPath . '/' . $module . '/routes.php';
                if (file_exists($routesFile)) {
                    // Pass router instance to routes file
                    $router = $this->router;
                    require $routesFile;
                }
            }
        }
    }

    /**
     * Setup default middleware stack
     */
    private function setupMiddleware(): void
    {
        $this->middleware->add(new \App\Core\Middleware\SecurityMiddleware());
        $this->middleware->add(new \App\Core\Middleware\CsrfMiddleware());
    }

    /**
     * Execute controller method
     */
    private function executeController(array $route): void
    {
        [$controllerClass, $method] = explode('@', $route['handler']);

        // Normalize controller class to fully-qualified name
        if (!str_contains($controllerClass, '\\')) {
            // No backslash provided → assume default Controller in module
            $controllerClass = "App\\Modules\\{$route['module']}\\Controller";
        } else {
            // Has backslash but may be relative like "Home\\Controller"
            if (strpos($controllerClass, 'App\\') !== 0) {
                $segments = explode('\\', $controllerClass);
                $moduleName = $segments[0] ?? $route['module'];
                $className = end($segments);
                $controllerClass = "App\\Modules\\{$moduleName}\\{$className}";
            }
        }

        if (!class_exists($controllerClass)) {
            $this->handleNotFound();
            return;
        }

        $controller = new $controllerClass();

        if (!method_exists($controller, $method)) {
            $this->handleNotFound();
            return;
        }

        // Inject dependencies
        $this->container->inject($controller);

        // Execute method
        $result = $controller->$method();

        // Handle response
        if ($result instanceof Response) {
            $result->send();
        } elseif (is_array($result) || is_object($result)) {
            $response = $this->container->get('response');
            $response->json($result)->send();
        } else {
            echo $result;
        }
    }

    /**
     * Handle 404 Not Found
     */
    private function handleNotFound(): void
    {
        try {
            $errorController = new \App\Modules\Error\Controller();
            $errorController->notFound();
        } catch (\Throwable $e) {
            // Fallback to basic 404
            http_response_code(404);
            echo "<!DOCTYPE html>\n";
            echo "<html>\n<head>\n";
            echo "<title>404 - Page Not Found</title>\n";
            echo "<script src=\"https://cdn.tailwindcss.com\"></script>\n";
            echo "<link href=\"https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap\" rel=\"stylesheet\">\n";
            echo "</head>\n<body class=\"font-sans bg-slate-50 min-h-screen\">\n";
            echo "<div class=\"min-h-screen flex items-center justify-center px-4 sm:px-6 lg:px-8\">\n";
            echo "<div class=\"max-w-md w-full space-y-8\">\n";
            echo "<div class=\"text-center\">\n";
            echo "<div class=\"mx-auto h-24 w-24 bg-slate-100 rounded-full flex items-center justify-center mb-6\">\n";
            echo "<svg class=\"h-12 w-12 text-slate-400\" fill=\"none\" stroke=\"currentColor\" viewBox=\"0 0 24 24\">\n";
            echo "<path stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\" d=\"M9.172 16.172a4 4 0 015.656 0M9 12h6m-6-4h6m2 5.291A7.962 7.962 0 0112 15c-2.34 0-4.29-1.009-5.824-2.709M15 12a3 3 0 11-6 0 3 3 0 016 0z\"></path>\n";
            echo "</svg>\n";
            echo "</div>\n";
            echo "<h1 class=\"text-6xl font-bold text-slate-900 mb-2\">404</h1>\n";
            echo "<h2 class=\"text-2xl font-semibold text-slate-900 mb-4\">Page Not Found</h2>\n";
            echo "<p class=\"text-slate-600 mb-8\">The page you are looking for could not be found.</p>\n";
            echo "<div class=\"space-y-4\">\n";
            echo "<a href=\"/\" class=\"w-full flex justify-center py-3 px-4 border border-transparent rounded-md shadow-sm text-sm font-medium text-white bg-slate-900 hover:bg-slate-800 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-slate-900\">Return to Home</a>\n";
            echo "<button onclick=\"history.back()\" class=\"w-full flex justify-center py-3 px-4 border border-slate-300 rounded-md shadow-sm text-sm font-medium text-slate-700 bg-white hover:bg-slate-50 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-slate-500\">Go Back</button>\n";
            echo "</div>\n";
            echo "<div class=\"mt-8 text-sm text-slate-500\">If you believe this is an error, please contact support.</div>\n";
            echo "</div>\n";
            echo "</div>\n";
            echo "</div>\n";
            echo "</body>\n</html>\n";
        }
    }
}