import 'package:flutter/foundation.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:go_router/go_router.dart';

import '../providers/auth_provider.dart';
import '../utils/permissions.dart';
import '../screens/admin/admin_hub_page.dart';
import '../screens/admin/app/app_version_page.dart';
import '../screens/admin/app/tv_app_page.dart';
import '../screens/admin/channel/channel_management_page.dart';
import '../screens/admin/intro/intro_category_page.dart';
import '../screens/admin/intro/intro_store_content_page.dart';
import '../screens/admin/intro/intro_store_list_page.dart';
import '../screens/admin/marquee/marquee_management_page.dart';
import '../screens/admin/media/media_list_page.dart';
import '../screens/admin/media/media_rank_page.dart';
import '../screens/admin/sys/config_page.dart';
import '../screens/admin/sys/log_page.dart';
import '../screens/admin/sys/menu_page.dart';
import '../screens/admin/sys/role_page.dart';
import '../screens/admin/sys/schedule_page.dart';
import '../screens/admin/sys/user_page.dart';
import '../screens/device/device_activation_page.dart';
import '../screens/device/device_group_page.dart';
import '../screens/device/device_scan_page.dart';
import '../screens/device/store_config_page.dart';
import '../screens/home/device_detail_page.dart';
import '../screens/home/device_list_page.dart';
import '../screens/home/home_page.dart';
import '../screens/login/login_page.dart';
import '../models/store_info.dart';
import '../screens/profile/settings_page.dart';
import '../screens/store/org_tree_page.dart';
import '../screens/store/store_detail_page.dart';
import '../screens/store/store_list_page.dart';
import '../widgets/app_bottom_nav.dart';

/// 全局路由配置。
///
/// 路由表：
/// - `/login`                登录页（未登录时重定向到此）
/// - `/`                     首页仪表盘（底部导航第 1 个 tab）
/// - `/device`               设备列表（底部导航第 2 个 tab）
/// - `/device/:id`            设备详情
/// - `/device/group`          设备分组
/// - `/device/activation`     激活码管理
/// - `/device/store-config`   门店配置
/// - `/store`                门店管理（底部导航第 3 个 tab）
/// - `/store/org-tree`        组织架构
/// - `/store/:id`            门店详情
/// - `/admin`                管理中心（底部导航第 4 个 tab）
/// - `/admin/sys/*`           系统管理子模块
/// - `/admin/app/*`           应用管理子模块
/// - `/admin/media/*`         媒资管理子模块
/// - `/admin/intro/*`        公司介绍子模块
/// - `/profile`              我的（底部导航第 5 个 tab）
/// - `/profile/settings`     设置
final appRouterProvider = Provider<GoRouter>((ref) {
  // 登录态变化时触发路由重定向刷新，而不重建整个 GoRouter。
  final refreshNotifier = ValueNotifier<int>(0);
  ref
    ..onDispose(refreshNotifier.dispose)
    ..listen(authProvider, (_, __) => refreshNotifier.value++);

  return GoRouter(
    initialLocation: '/',
    refreshListenable: refreshNotifier,
    redirect: (context, state) {
      final auth = ref.read(authProvider);
      final loggedIn = auth.isLoggedIn;
      final isLoginRoute = state.matchedLocation == '/login';

      if (!loggedIn && !isLoginRoute) {
        return '/login';
      }
      if (loggedIn && isLoginRoute) {
        return '/';
      }
      // 功能模块按账号权限收敛（菜单可见性与此处路由可达性由同一套
      // [SessionPermissions] 谓词驱动，确保一致）：
      // - 系统管理中仅 /admin/sys/user（用户管理）对所有已登录账号开放；
      //   其余 /admin/sys/*（角色/菜单/配置/日志/定时任务）仅管理员可访问；
      // - 媒资 /admin/media/*、应用 /admin/app/*、公司介绍(分类维度)
      //   /admin/intro/category 仅管理员可见/可访问；
      // - 渠道商管理 /admin/channel 对管理员与渠道商开放，代理商不可访问；
      // 非管理员（受限账号）即使通过深链/返回键进入上述受限路由也重定向回
      // 管理首页，作为入口收敛的兜底，防止越权查看/操作跨组织数据。
      // 注：公司介绍门店维度入口（/admin/intro/store-list、/admin/intro/
      // store-content/*）按门店维度展示、数据已由 getMyStores 收敛，对所有账号开放。
      final loc = state.matchedLocation;
      final user = ref.read(authProvider).user;
      final cat = SessionPermissions.category(user);
      if (cat != AccountCategory.admin) {
        final isUserManagement =
            loc == '/admin/sys/user' || loc.startsWith('/admin/sys/user/');
        final isSysModule = loc.startsWith('/admin/sys') && !isUserManagement;
        if (isSysModule ||
            loc.startsWith('/admin/media') ||
            loc.startsWith('/admin/app') ||
            loc.startsWith('/admin/intro/category')) {
          return '/admin';
        }
        // 代理商（非渠道商）访问渠道商管理 → 弹回（其菜单中本就隐藏该入口）。
        if (loc.startsWith('/admin/channel') &&
            cat != AccountCategory.channelMerchant) {
          return '/admin';
        }
      }
      return null;
    },
    routes: [
      GoRoute(
        path: '/login',
        name: 'login',
        builder: (context, state) => const LoginPage(),
      ),
      StatefulShellRoute.indexedStack(
        builder: (context, state, navigationShell) =>
            AppBottomNav(shell: navigationShell),
        branches: [
          // 首页（仪表盘）
          StatefulShellBranch(
            routes: [
              GoRoute(
                path: '/',
                name: 'home',
                builder: (context, state) => const HomePage(),
              ),
            ],
          ),
          // 设备
          StatefulShellBranch(
            routes: [
              GoRoute(
                path: '/device',
                name: 'device',
                builder: (context, state) => const DeviceListPage(),
                routes: [
                  // 具名子路由（group/activation/store-config/scan）必须放在参数路由 :id 之前，
                  // 否则 `/device/scan` 会被 `:id` 匹配成设备 ID="scan"，导致进入错误的详情页。
                  GoRoute(
                    path: 'group',
                    name: 'deviceGroup',
                    builder: (context, state) => const DeviceGroupPage(),
                  ),
                  GoRoute(
                    path: 'activation',
                    name: 'deviceActivation',
                    builder: (context, state) =>
                        const DeviceActivationPage(),
                  ),
                  GoRoute(
                    path: 'store-config',
                    name: 'storeConfig',
                    builder: (context, state) => const StoreConfigPage(),
                  ),
                  GoRoute(
                    path: 'scan',
                    name: 'deviceScan',
                    builder: (context, state) {
                      final mode =
                          state.uri.queryParameters['mode'] ?? 'query';
                      final deviceId =
                          state.uri.queryParameters['deviceId'];
                      final storeId =
                          state.uri.queryParameters['storeId'];
                      final storeName =
                          state.uri.queryParameters['storeName'];
                      final groupId =
                          state.uri.queryParameters['groupId'];
                      return DeviceScanPage(
                        mode: mode,
                        deviceId: deviceId,
                        storeId: storeId,
                        storeName: storeName,
                        groupId: groupId,
                      );
                    },
                  ),
                  GoRoute(
                    path: ':id',
                    name: 'deviceDetail',
                    builder: (context, state) {
                      final id = state.pathParameters['id'] ?? '';
                      return DeviceDetailPage(deviceId: id);
                    },
                  ),
                ],
              ),
            ],
          ),
          // 门店
          StatefulShellBranch(
            routes: [
              GoRoute(
                path: '/store',
                name: 'store',
                builder: (context, state) => const StoreListPage(),
                routes: [
                  GoRoute(
                    path: 'org-tree',
                    name: 'orgTree',
                    builder: (context, state) => const OrgTreePage(),
                  ),
                  GoRoute(
                    path: ':id',
                    name: 'storeDetail',
                    builder: (context, state) {
                      final id = state.pathParameters['id'] ?? '';
                      return StoreDetailPage(storeId: id);
                    },
                  ),
                ],
              ),
            ],
          ),
          // 管理
          StatefulShellBranch(
            routes: [
              GoRoute(
                path: '/admin',
                name: 'admin',
                builder: (context, state) => const AdminHubPage(),
                routes: [
                  // 管理模块内的设备/激活码别名路由：复用设备分支的页面组件，
                  // 但在 /admin 分支栈下 push，使底部导航仍停留「管理」tab，
                  // 返回键可正常 pop 回管理首页，避免此前 push 到 /device 分支栈导致的返回键异常。
                  GoRoute(
                    path: 'device',
                    name: 'adminDevice',
                    builder: (context, state) => const DeviceListPage(),
                  ),
                  GoRoute(
                    path: 'activation',
                    name: 'adminActivation',
                    builder: (context, state) =>
                        const DeviceActivationPage(),
                  ),
                  // 系统管理
                  GoRoute(
                    path: 'sys/user',
                    name: 'sysUser',
                    builder: (context, state) => const UserPage(),
                  ),
                  GoRoute(
                    path: 'sys/role',
                    name: 'sysRole',
                    builder: (context, state) => const RolePage(),
                  ),
                  GoRoute(
                    path: 'sys/menu',
                    name: 'sysMenu',
                    builder: (context, state) => const MenuPage(),
                  ),
                  GoRoute(
                    path: 'sys/config',
                    name: 'sysConfig',
                    builder: (context, state) => const ConfigPage(),
                  ),
                  GoRoute(
                    path: 'sys/log',
                    name: 'sysLog',
                    builder: (context, state) => const LogPage(),
                  ),
                  GoRoute(
                    path: 'sys/schedule',
                    name: 'sysSchedule',
                    builder: (context, state) => const SchedulePage(),
                  ),
                  // 应用管理
                  GoRoute(
                    path: 'app/version',
                    name: 'appVersion',
                    builder: (context, state) => const AppVersionPage(),
                  ),
                  GoRoute(
                    path: 'app/tv-app',
                    name: 'tvApp',
                    builder: (context, state) => const TvAppPage(),
                  ),
                  // 滚动字幕管理
                  GoRoute(
                    path: 'marquee',
                    name: 'marqueeManagement',
                    builder: (context, state) => const MarqueeManagementPage(),
                  ),
                  // 渠道商管理
                  GoRoute(
                    path: 'channel',
                    name: 'channelManagement',
                    builder: (context, state) => const ChannelManagementPage(),
                  ),
                  // 媒资管理
                  GoRoute(
                    path: 'media/list',
                    name: 'mediaList',
                    builder: (context, state) => const MediaListPage(),
                  ),
                  GoRoute(
                    path: 'media/rank',
                    name: 'mediaRank',
                    builder: (context, state) => const MediaRankPage(),
                  ),
                  // 公司介绍（门店维度）
                  GoRoute(
                    path: 'intro/store-list',
                    name: 'introStoreList',
                    builder: (context, state) => const IntroStoreListPage(),
                  ),
                  GoRoute(
                    path: 'intro/store-content/:storeId',
                    name: 'introStoreContent',
                    builder: (context, state) {
                      final storeId = state.pathParameters['storeId'] ?? '';
                      final store = state.extra is StoreInfo
                          ? state.extra as StoreInfo
                          : null;
                      return IntroStoreContentPage(
                        storeId: storeId,
                        store: store,
                      );
                    },
                  ),
                  // 公司介绍（原分类维度，保留作为管理备用入口）
                  GoRoute(
                    path: 'intro/category',
                    name: 'introCategory',
                    builder: (context, state) => const IntroCategoryPage(),
                  ),
                ],
              ),
            ],
          ),
          // 我的
          StatefulShellBranch(
            routes: [
              GoRoute(
                path: '/profile',
                name: 'profile',
                builder: (context, state) => const SettingsPage(),
                routes: [
                  GoRoute(
                    path: 'settings',
                    name: 'profileSettings',
                    builder: (context, state) => const SettingsPage(),
                  ),
                ],
              ),
            ],
          ),
        ],
      ),
    ],
  );
});