// Author: fruit.com.cn

import 'dart:async';

import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:provider/provider.dart';

import '../../core/config/app_config.dart';
import '../../core/data/models/drama.dart';
import '../../core/data/services/auth_controller.dart';
import '../../core/data/services/catalog_controller.dart';
import '../../core/platform/haptics.dart';
import '../../core/theme/app_colors.dart';
import '../../core/theme/app_theme.dart';
import '../../core/widgets/app_bottom_nav.dart';
import '../../core/widgets/auth_gate.dart';
import '../../core/widgets/empty_state.dart';
import '../../core/widgets/server_endpoint_dialog.dart';
import '../../l10n/app_localizations.dart';
import '../discover/discover_view.dart';
import '../splash/splash_page.dart';
import '../mine/mine_view.dart';
import '../player/player_view.dart';
import 'home_binding.dart';
import 'home_logic.dart';
import 'widgets/home_menu_sheet.dart';

class HomePage extends StatelessWidget {
  const HomePage({super.key});

  @override
  Widget build(BuildContext context) {
    final catalog = context.watch<CatalogController>();
    if (!catalog.settled) return const SplashPage();
    final l10n = AppLocalizations.of(context)!;
    return Theme(
      data: AppTheme.dark(),
      child: _buildHome(context, catalog, l10n),
    );
  }

  Widget _buildHome(
    BuildContext context,
    CatalogController catalog,
    AppLocalizations l10n,
  ) {
    if (catalog.loading) {
      return const Scaffold(
        backgroundColor: AppColors.ink,
        body: Center(child: CircularProgressIndicator()),
      );
    }
    if (catalog.error != null) {
      return Scaffold(
        backgroundColor: AppColors.ink,
        body: HomeFailureView(
          onRetry: catalog.load,
          showDebugTools: kDebugMode,
        ),
      );
    }
    if (catalog.dramas.isEmpty) {
      return Scaffold(
        backgroundColor: AppColors.ink,
        body: EmptyState(
          key: const Key('home-empty'),
          icon: Icons.movie_outlined,
          title: l10n.noStories,
          subtitle: l10n.emptyHint,
          actionLabel: l10n.retry,
          onAction: catalog.load,
        ),
      );
    }

    return _HomeTabs(
      key: ValueKey(catalog.dramas.first.id),
      dramas: catalog.dramas,
    );
  }
}

/// Home catalog failure with optional debug-only endpoint controls.
class HomeFailureView extends StatelessWidget {
  const HomeFailureView({
    super.key,
    required this.onRetry,
    this.showDebugTools = kDebugMode,
  });

  final VoidCallback onRetry;
  final bool showDebugTools;

  @override
  Widget build(BuildContext context) {
    final l10n = AppLocalizations.of(context)!;
    return Column(
      children: [
        Expanded(
          child: EmptyState(
            icon: Icons.cloud_off_rounded,
            title: l10n.catalogError,
            actionLabel: l10n.retry,
            onAction: onRetry,
          ),
        ),
        if (showDebugTools) _debugTools(context, l10n),
      ],
    );
  }

  Widget _debugTools(BuildContext context, AppLocalizations l10n) {
    return Padding(
      padding: const EdgeInsets.fromLTRB(24, 0, 24, 24),
      child: Column(
        children: [
          Text(
            AppConfig.apiBaseUrl,
            style: const TextStyle(fontSize: 12, color: AppColors.muted),
          ),
          const SizedBox(height: 8),
          OutlinedButton.icon(
            key: const Key('home-server-settings'),
            onPressed: () => showServerEndpointDialog(context, l10n),
            icon: const Icon(Icons.dns_outlined),
            label: Text(l10n.serverSettings),
          ),
        ],
      ),
    );
  }
}

/// The three primary destinations share a single route and keep their state.
class _HomeTabs extends StatefulWidget {
  const _HomeTabs({super.key, required this.dramas});

  final List<Drama> dramas;

  @override
  State<_HomeTabs> createState() => _HomeTabsState();
}

class _HomeTabsState extends State<_HomeTabs> {
  late final HomeLogic logic;

  @override
  void initState() {
    super.initState();
    logic = HomeBinding().create(widget.dramas);
  }

  @override
  void dispose() {
    logic.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return ListenableBuilder(
      listenable: logic,
      builder: (context, _) => _scaffold(context),
    );
  }

  Widget _scaffold(BuildContext context) {
    final l10n = AppLocalizations.of(context)!;
    // 登录态统一从 AuthController 取（原来是 home_logic 里的本地演示开关）
    final signedIn = context.watch<AuthController>().isSignedIn;
    return PopScope(
      canPop: false,
      onPopInvokedWithResult: (didPop, _) {
        if (didPop) return;
        if (!logic.videoImmersive && logic.tab == 1) {
          unawaited(_openMenu(context));
        } else {
          logic.onSystemBack();
        }
      },
      child: Scaffold(
        key: logic.scaffoldKey,
        backgroundColor: AppColors.ink,
        body: IndexedStack(
          index: logic.tab,
          children: [
            PlayerPage(
              drama: widget.dramas.first,
              feedDramas: widget.dramas,
              onDramaChanged: logic.onDramaChanged,
              initialIndex: 0,
              homeMode: true,
              embedded: true,
              active: logic.tab == 0 && !logic.drawerOpen && !logic.detailOpen,
              resumeRequest: logic.resumeRequest,
              backRequest: logic.backRequest,
              onDiscover: () => logic.select(1),
              onMy: logic.openProfile,
              onSearch: () => logic.select(1, search: true),
              onMenu: () => _openMenu(context),
              onImmersiveChanged: logic.onImmersiveChanged,
            ),
            DiscoverPage(
              drama: logic.currentDrama,
              dramas: widget.dramas,
              onDramaSelected: (drama) => logic.playDrama(context, drama),
              duration: Duration.zero,
              embedded: true,
              active: logic.tab == 1,
              searchRequest: logic.searchRequest,
              signedIn: signedIn,
              onSignIn: () => openAuthPage(context),
              onCoins: logic.openProfile,
              onRewards: logic.openProfile,
              onAction: (action) => logic.discoverAction(context, action),
            ),
            MyPage(
              drama: logic.currentDrama,
              dramas: widget.dramas,
              onDramaSelected: (drama) => logic.openDrama(context, drama),
              duration: Duration.zero,
              initialSection: logic.mySection,
              profile: logic.profile,
              sectionRequest: logic.sectionRequest,
              embedded: true,
              active: logic.tab == 2,
              onAction: logic.myAction,
              signedIn: signedIn,
              onSignIn: () => openAuthPage(context),
              onSignOut: () => context.read<AuthController>().signOut(),
            ),
          ],
        ),
        bottomNavigationBar: logic.videoImmersive
            ? null
            : AppBottomNav(
                barKey: const Key('home-tabs-bar'),
                items: [
                  AppBottomNavItem(
                    tabKey: const Key('tab-home'),
                    icon: Icons.play_circle_outline_rounded,
                    selectedIcon: Icons.play_circle_fill_rounded,
                    label: l10n.homeTab,
                    selected: logic.tab == 0,
                    onTap: () => _selectTab(context, 0),
                  ),
                  AppBottomNavItem(
                    tabKey: const Key('tab-discover'),
                    icon: Icons.explore_outlined,
                    selectedIcon: Icons.explore_rounded,
                    label: l10n.discoverTab,
                    selected: logic.tab == 1,
                    onTap: () => _selectTab(context, 1),
                  ),
                  AppBottomNavItem(
                    tabKey: const Key('tab-my'),
                    icon: Icons.video_library_outlined,
                    selectedIcon: Icons.video_library_rounded,
                    label: l10n.myTab,
                    selected: logic.tab == 2,
                    onTap: () => _selectTab(context, 2, myProfile: true),
                  ),
                ],
              ),
      ),
    );
  }

  void _selectTab(BuildContext context, int tab, {bool myProfile = false}) {
    final same = logic.tab == tab;
    if (!same) {
      unawaited(context.read<Haptics>().selectionClick());
    }
    if (tab == 2) {
      myProfile ? logic.openProfile() : logic.openLibrary();
    } else {
      logic.select(tab);
    }
  }

  Future<void> _openMenu(BuildContext context) async {
    logic.setMenuOpen(true);
    await showModalBottomSheet<void>(
      context: context,
      backgroundColor: AppColors.card,
      showDragHandle: true,
      isScrollControlled: true,
      builder: (_) => HomeMenuSheet(
        drama: logic.currentDrama,
        onOpenSeries: () => logic.openCurrentSeries(context),
        onDiscover: () => logic.selectFromMenu(1),
        onHistory: () => logic.openLibrary(section: 0),
        onWatchlist: logic.openLibrary,
        onLiked: () => logic.selectFromMenu(2, mySection: 2),
      ),
    );
    logic.setMenuOpen(false);
  }
}