ReelShort/lib/pages/home/home_logic.dart

// Author: fruit.com.cn

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

import '../../core/data/models/drama.dart';
import '../../core/data/services/catalog_controller.dart';
import '../../core/data/services/download_controller.dart';
import '../../core/data/services/wallet_controller.dart';
import '../discover/discover_types.dart';
import '../drama_detail/drama_detail_view.dart';
import '../favorites/favorites_page.dart';
import '../mine/mine_types.dart';
import '../player/player_view.dart';
import '../watch_records/watch_records_page.dart';

class HomeLogic extends ChangeNotifier {
  HomeLogic(List<Drama> dramas) : currentDrama = dramas.first;

  final scaffoldKey = GlobalKey<ScaffoldState>();
  Drama currentDrama;
  int tab = 0;
  int searchRequest = 0;
  int resumeRequest = 0;
  int backRequest = 0;
  bool drawerOpen = false;
  bool detailOpen = false;
  bool videoImmersive = false;
  bool _disposed = false;

  void notify() {
    if (!_disposed) notifyListeners();
  }

  void select(int nextTab, {bool search = false, bool resume = false}) {
    FocusManager.instance.primaryFocus?.unfocus();
    tab = nextTab;
    if (search) searchRequest++;
    if (resume) resumeRequest++;
    notify();
  }

  void setMenuOpen(bool value) {
    if (drawerOpen == value) return;
    drawerOpen = value;
    notify();
  }

  Future<void> openCurrentSeries(BuildContext context) async {
    detailOpen = true;
    notify();
    await WidgetsBinding.instance.endOfFrame;
    if (!context.mounted) return;
    try {
      await Navigator.of(context).push<void>(
        MaterialPageRoute(builder: (_) => DramaDetailPage(drama: currentDrama)),
      );
    } finally {
      if (context.mounted) {
        detailOpen = false;
        notify();
      }
    }
  }

  void openDrama(BuildContext context, Drama drama) {
    Navigator.of(context).push(
      MaterialPageRoute<void>(builder: (_) => DramaDetailPage(drama: drama)),
    );
  }

  Future<void> playDrama(
    BuildContext context,
    Drama drama, {
    String? episodeId,
  }) async {
    // 列表卡片只有一集预览，进入播放前补齐完整剧集，否则选集列表是空的。
    var playable = drama;
    try {
      playable = await context.read<CatalogController>().requireDetail(drama);
    } catch (_) {
      // 取详情失败就用卡片自带的那一集起播。
    }
    if (!context.mounted) return;
    final index = episodeId == null
        ? 0
        : playable.episodes.indexWhere((episode) => episode.id == episodeId);
    await Navigator.of(context).push(
      MaterialPageRoute<void>(
        builder: (_) => PlayerPage(
          drama: playable,
          initialIndex: index < 0 ? 0 : index,
          wallet: context.read<WalletController>(),
          downloads: context.read<DownloadController>(),
        ),
      ),
    );
  }

  void openProfile() => select(3);

  void discoverAction(DiscoverPageAction action) {
    switch (action) {
      case DiscoverPageAction.home:
        select(0);
      case DiscoverPageAction.create:
        select(2);
      case DiscoverPageAction.my:
        select(3);
    }
  }

  void openFavorites(BuildContext context) {
    Navigator.of(
      context,
    ).push(MaterialPageRoute<void>(builder: (_) => const FavoritesPage()));
  }

  void openHistory(BuildContext context) {
    Navigator.of(
      context,
    ).push(MaterialPageRoute<void>(builder: (_) => const WatchRecordsPage()));
  }

  void myAction(MyPageAction action) {
    switch (action) {
      case MyPageAction.home:
        select(0);
      case MyPageAction.discover:
        select(1, search: true);
      case MyPageAction.create:
        select(2);
      case MyPageAction.resume:
        select(0, resume: true);
    }
  }

  void onSystemBack() {
    if (videoImmersive) {
      backRequest++;
      notify();
    } else if (tab != 0) {
      select(0);
    }
  }

  void onDramaChanged(Drama drama) {
    currentDrama = drama;
    notify();
  }

  void onImmersiveChanged(bool value) {
    videoImmersive = value;
    notify();
  }

  @override
  void dispose() {
    _disposed = true;
    super.dispose();
  }
}