import 'dart:async';

import 'package:flutter/material.dart';
import 'package:patbond_flutter/analytics/analytics_page_name.dart';
import 'package:patbond_flutter/analytics/page_view_tracker.dart';
import 'package:patbond_flutter/core/theme/app_theme.dart';
import 'package:patbond_flutter/core/widgets/avatar_upload_sheet.dart';
import 'package:patbond_flutter/features/community/community_controller.dart';
import 'package:patbond_flutter/features/community/community_interaction_analytics.dart';
import 'package:patbond_flutter/features/community/feed_analytics.dart';
import 'package:patbond_flutter/features/community/media_uploader.dart';
import 'package:patbond_flutter/features/community/post_analytics.dart';
import 'package:patbond_flutter/features/community/post_compose_page.dart';
import 'package:patbond_flutter/features/create/create_page.dart';
import 'package:patbond_flutter/features/home/home_page.dart';
import 'package:patbond_flutter/features/pets/health_record_analytics.dart';
import 'package:patbond_flutter/features/pets/pet_analytics.dart';
import 'package:patbond_flutter/features/pets/pets_controller.dart';
import 'package:patbond_flutter/features/pets/pets_page.dart';
import 'package:patbond_flutter/features/post/post_detail_page.dart';
import 'package:patbond_flutter/features/profile/profile_controller.dart';
import 'package:patbond_flutter/features/profile/profile_page.dart';
import 'package:patbond_flutter/features/services/services_page.dart';
import 'package:patbond_flutter/state/app_state.dart';
import 'package:patbond_flutter/widgets/common.dart';

class MainShellPage extends StatefulWidget {
  const MainShellPage({
    required this.appState,
    required this.petsController,
    required this.communityController,
    required this.profileController,
    super.key,
    this.currentUserId,
    this.petAnalytics,
    this.healthRecordAnalytics,
    this.feedAnalytics,
    this.interactionAnalytics,
    this.postAnalytics,
    this.mediaUploaderFactory,
    this.avatarUploaderBuilder,
    this.pageViewTracker,
    this.onLogout,
  });

  final AppState appState;

  /// 宠物档案状态（T2-11 拆出的独立 pets feature；档案 Tab 数据源）。
  final PetsController petsController;

  /// 社区状态（T3-12 数据层；首页 Feed segment 数据源，T3-14 接线）。
  final CommunityController communityController;

  /// 本人资料与社区数字（T3.5-08）；资料 Tab 与首页问候语共用。
  final ProfileController profileController;

  /// 当前登录用户 id（详情页评论删除入口 / 关注钮自见性的 UI 判定）。
  final String? currentUserId;

  /// pet 域埋点强类型封装（建宠漏斗三事件）。
  final PetAnalytics? petAnalytics;

  /// health_record 域埋点强类型封装（T2-13 创建漏斗三事件 + viewed）。
  final HealthRecordAnalytics? healthRecordAnalytics;

  /// feed 域埋点（T3-14 聚合曝光 + 加载失败）。
  final FeedAnalytics? feedAnalytics;

  /// 互动域埋点（T3-16 评论成败对 + 关注对；详情页消费）。
  final CommunityInteractionAnalytics? interactionAnalytics;

  /// post 域埋点（T3-17 发布漏斗五事件 + 媒体三段；发布页消费）。
  final PostAnalytics? postAnalytics;

  /// 发布页 [MediaUploader] 构造口（桌面实测 / 测试替换选图与压缩层）。
  final MediaUploaderFactory? mediaUploaderFactory;

  /// 头像上传构造口（T3.5-08/09：资料编辑页与宠物详情页）。
  final AvatarUploaderBuilder? avatarUploaderBuilder;

  /// Tab 曝光补点（IndexedStack 切换不产生路由事件，03 号评估 §3.2）。
  final PageViewTracker? pageViewTracker;

  /// 退出登录：调 logout 接口并清会话，认证状态机自动回登录页。
  final Future<void> Function()? onLogout;

  @override
  State<MainShellPage> createState() => _MainShellPageState();
}

class _MainShellPageState extends State<MainShellPage> {
  int currentIndex = 0;
  bool showPersonalServices = false;

  static const titles = ['首页', '创作中心', '健康档案', '本地服务', '我的资料'];

  /// Tab 索引 → pageName 枚举（03 号评估 §3.2 映射表；档案 Tab 自 T2-12
  /// 起为真实宠物列表，页名由 pet_archive 改报 pet_list，06 §5.2 字典 v2）。
  static const _tabPages = [
    AnalyticsPageName.home,
    AnalyticsPageName.create,
    AnalyticsPageName.petList,
    AnalyticsPageName.services,
    AnalyticsPageName.profile,
  ];

  @override
  void initState() {
    super.initState();
    // 初始 Tab 曝光补一次（03 号评估 §3.2 手动补点 1）。
    widget.pageViewTracker?.reportTab(_tabPages[currentIndex]);
  }

  void selectTab(int index) {
    setState(() => currentIndex = index);
    widget.pageViewTracker?.reportTab(_tabPages[index]);
  }

  void openServices(bool personal) {
    setState(() {
      showPersonalServices = personal;
      currentIndex = 3;
    });
    widget.pageViewTracker?.reportTab(_tabPages[3]);
  }

  /// 帖子详情（T3-15：真实数据整页；Feed 卡片与详情共享
  /// communityController，互动状态跨页一致）。
  void openPost(String postId) {
    Navigator.of(context).push(
      MaterialPageRoute<void>(
        settings: RouteSettings(name: AnalyticsPageName.postDetail.pageName),
        builder: (context) => PostDetailPage(
          controller: widget.communityController,
          postId: postId,
          currentUserId: widget.currentUserId,
          analytics: widget.interactionAnalytics,
        ),
      ),
    );
  }

  /// 发布页（T3-17：真实发布链路）。发布成功后回首页 Feed 并整体刷新，
  /// 新帖按 `(published_at DESC, id DESC)` 落在首位（跨客户端同一序）。
  Future<void> openCompose(PostEntryPoint entryPoint) async {
    final published = await Navigator.of(context).push<bool>(
      MaterialPageRoute<bool>(
        settings: RouteSettings(name: AnalyticsPageName.postForm.pageName),
        builder: (context) => PostComposePage(
          controller: widget.communityController,
          entryPoint: entryPoint,
          analytics: widget.postAnalytics,
          uploaderFactory: widget.mediaUploaderFactory,
        ),
      ),
    );
    if (!mounted || published != true) return;
    selectTab(0);
    unawaited(widget.communityController.refresh());
    ScaffoldMessenger.of(
      context,
    ).showSnackBar(const SnackBar(content: Text('已发布，去首页看看吧 🐾')));
  }

  @override
  Widget build(BuildContext context) {
    return AnimatedBuilder(
      animation: widget.appState,
      builder: (context, _) {
        if (!widget.appState.isReady) {
          return const Scaffold(
            body: Center(child: CircularProgressIndicator()),
          );
        }

        final pages = [
          HomePage(
            appState: widget.appState,
            communityController: widget.communityController,
            profileController: widget.profileController,
            feedAnalytics: widget.feedAnalytics,
            isActive: currentIndex == 0,
            onOpenServices: openServices,
            onOpenCompose: () => openCompose(PostEntryPoint.feed),
            onOpenPost: openPost,
          ),
          CreatePage(
            appState: widget.appState,
            // T3-17：发布半边已真实化（发布页 push），AI 生成模拟原样留 M4。
            onOpenCompose: () => openCompose(PostEntryPoint.createTab),
          ),
          PetsPage(
            controller: widget.petsController,
            analytics: widget.petAnalytics,
            healthAnalytics: widget.healthRecordAnalytics,
            avatarUploaderBuilder: widget.avatarUploaderBuilder,
          ),
          ServicesPage(
            showPersonal: showPersonalServices,
            locationWeather: widget.appState.locationWeather,
          ),
          ProfilePage(
            appState: widget.appState,
            controller: widget.profileController,
            avatarUploaderBuilder: widget.avatarUploaderBuilder,
            onLogout: widget.onLogout,
          ),
        ];

        return Scaffold(
          appBar: AppBar(
            backgroundColor: Colors.white.withAlpha(245),
            surfaceTintColor: Colors.transparent,
            scrolledUnderElevation: 1,
            centerTitle: true,
            title: Text(
              titles[currentIndex],
              style: const TextStyle(fontSize: 16, fontWeight: FontWeight.w800),
            ),
            leadingWidth: 118,
            leading: InkWell(
              onTap: () => selectTab(2),
              borderRadius: BorderRadius.circular(24),
              child: Padding(
                padding: const EdgeInsets.only(left: 14),
                child: Row(
                  children: [
                    RemoteImage(
                      url: widget.appState.pet.avatarUrl,
                      width: 36,
                      height: 36,
                      borderRadius: BorderRadius.circular(18),
                    ),
                    const SizedBox(width: 7),
                    const Expanded(
                      child: Text(
                        'Patbond',
                        maxLines: 1,
                        overflow: TextOverflow.ellipsis,
                        style: TextStyle(
                          color: AppColors.primary,
                          fontSize: 13,
                          fontWeight: FontWeight.w800,
                        ),
                      ),
                    ),
                  ],
                ),
              ),
            ),
            actions: [
              IconButton.filledTonal(
                tooltip: '通知',
                onPressed: () {
                  ScaffoldMessenger.of(
                    context,
                  ).showSnackBar(const SnackBar(content: Text('暂无新通知 🐾')));
                },
                icon: const Icon(Icons.notifications_outlined, size: 21),
              ),
              const SizedBox(width: 10),
            ],
          ),
          body: SafeArea(
            top: false,
            child: IndexedStack(index: currentIndex, children: pages),
          ),
          bottomNavigationBar: NavigationBar(
            selectedIndex: currentIndex,
            onDestinationSelected: selectTab,
            destinations: const [
              NavigationDestination(
                icon: Icon(Icons.home_outlined),
                selectedIcon: Icon(Icons.home_rounded),
                label: '首页',
              ),
              NavigationDestination(
                icon: Icon(Icons.auto_awesome_outlined),
                selectedIcon: Icon(Icons.auto_awesome),
                label: '创作',
              ),
              NavigationDestination(
                icon: Icon(Icons.pets_outlined),
                selectedIcon: Icon(Icons.pets),
                label: '档案',
              ),
              NavigationDestination(
                icon: Icon(Icons.storefront_outlined),
                selectedIcon: Icon(Icons.storefront),
                label: '服务',
              ),
              NavigationDestination(
                icon: Icon(Icons.person_outline),
                selectedIcon: Icon(Icons.person),
                label: '我的',
              ),
            ],
          ),
        );
      },
    );
  }
}