import 'package:flutter/material.dart';
import 'package:go_router/go_router.dart';

import '../core/network/interceptors/auth_interceptor.dart';
import '../features/auth/presentation/screens/login_screen.dart';
import '../features/auth/presentation/screens/signup_screen.dart';
import '../features/body_doubling/presentation/screens/rooms_screen.dart';
import '../features/settings/presentation/screens/settings_screen.dart';
import '../features/streaks/presentation/screens/streaks_screen.dart';
import '../features/tasks/presentation/screens/create_task_screen.dart';
import '../features/tasks/presentation/screens/focus_mode_screen.dart';
import '../features/tasks/presentation/screens/onboarding_screen.dart';
import '../features/tasks/presentation/screens/task_dashboard_screen.dart';
import '../features/tasks/presentation/screens/task_detail_screen.dart';
import '../features/time_perception/presentation/screens/time_dashboard_screen.dart';

/// Application router using GoRouter.
///
/// Auth redirect: unauthenticated users are sent to /login except
/// when they are already on /login, /signup, or /onboarding.
class AppRouter {
  AppRouter._();

  static final _rootNavigatorKey = GlobalKey<NavigatorState>();

  static final GoRouter router = GoRouter(
    navigatorKey: _rootNavigatorKey,
    initialLocation: '/',
    redirect: _authRedirect,
    routes: [
      // ── Home / Task Dashboard ────────────────────────────────────
      GoRoute(
        path: '/',
        name: 'home',
        builder: (context, state) => const TaskDashboardScreen(),
      ),

      // ── Focus mode — "just do the next thing" ───────────────────
      GoRoute(
        path: '/focus',
        name: 'focus',
        builder: (context, state) => const FocusModeScreen(),
      ),

      // ── Auth ─────────────────────────────────────────────────────
      GoRoute(
        path: '/login',
        name: 'login',
        builder: (context, state) => const LoginScreen(),
      ),
      GoRoute(
        path: '/signup',
        name: 'signup',
        builder: (context, state) => const SignupScreen(),
      ),

      // ── Task detail ──────────────────────────────────────────────
      GoRoute(
        path: '/task/:id',
        name: 'taskDetail',
        builder: (context, state) => TaskDetailScreen(
          taskId: state.pathParameters['id']!,
        ),
      ),

      // ── Create task ──────────────────────────────────────────────
      GoRoute(
        path: '/task-create',
        name: 'createTask',
        builder: (context, state) => const CreateTaskScreen(),
      ),

      // ── Streaks ──────────────────────────────────────────────────
      GoRoute(
        path: '/streaks',
        name: 'streaks',
        builder: (context, state) => const StreaksScreen(),
      ),

      // ── Time perception ──────────────────────────────────────────
      GoRoute(
        path: '/time',
        name: 'time',
        builder: (context, state) => const TimeDashboardScreen(),
      ),

      // ── Body doubling rooms ──────────────────────────────────────
      GoRoute(
        path: '/rooms',
        name: 'rooms',
        builder: (context, state) => const RoomsScreen(),
      ),

      // ── Settings ─────────────────────────────────────────────────
      GoRoute(
        path: '/settings',
        name: 'settings',
        builder: (context, state) => const SettingsScreen(),
      ),

      // ── Onboarding ───────────────────────────────────────────────
      GoRoute(
        path: '/onboarding',
        name: 'onboarding',
        builder: (context, state) => const OnboardingScreen(),
      ),
    ],
  );

  /// Redirect unauthenticated users to /login.
  static Future<String?> _authRedirect(
    BuildContext context,
    GoRouterState state,
  ) async {
    final publicPaths = {'/login', '/signup', '/onboarding'};
    if (publicPaths.contains(state.matchedLocation)) return null;

    final loggedIn = await AuthInterceptor.hasToken();
    if (!loggedIn) return '/login';

    return null; // no redirect needed
  }
}