ReelShort/lib/pages/home/home_logic.dart

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

import '../../core/data/models/drama.dart';
import '../../core/data/services/catalog_controller.dart';
import '../discover/discover_logic.dart';
import '../drama_detail/drama_detail_view.dart';
import '../mine/mine_logic.dart';
import '../player/player_view.dart';

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

  final scaffoldKey = GlobalKey<ScaffoldState>();
  Drama currentDrama;
  int tab = 1;
  int searchRequest = 0;
  int sectionRequest = 0;
  int resumeRequest = 0;
  int backRequest = 0;
  int mySection = 0;
  bool drawerOpen = false;
  bool detailOpen = false;
  bool videoImmersive = false;
  bool profile = false;
  bool _disposed = false;

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

  void select(
    int nextTab, {
    bool search = false,
    bool watchlist = false,
    bool resume = false,
    int? mySection,
  }) {
    FocusManager.instance.primaryFocus?.unfocus();
    tab = nextTab;
    if (search) searchRequest++;
    if (watchlist || mySection != null) {
      this.mySection = mySection ?? 1;
      sectionRequest++;
    }
    if (resume) resumeRequest++;
    notify();
  }

  void openMenu() {
    drawerOpen = true;
    notify();
    scaffoldKey.currentState?.openDrawer();
  }

  void selectFromMenu(int nextTab, {int? mySection}) {
    scaffoldKey.currentState?.closeDrawer();
    select(nextTab, mySection: mySection);
  }

  Future<void> openCurrentSeries(BuildContext context) async {
    detailOpen = true;
    notify();
    scaffoldKey.currentState?.closeDrawer();
    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) 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;
    Navigator.of(context).push(
      MaterialPageRoute<void>(
        builder: (_) => PlayerPage(drama: playable, initialIndex: 0),
      ),
    );
  }

  void openProfile() {
    profile = true;
    scaffoldKey.currentState?.closeDrawer();
    select(2, mySection: 0);
  }

  void openLibrary({int section = 1}) {
    profile = false;
    scaffoldKey.currentState?.closeDrawer();
    select(2, mySection: section);
  }

  void discoverAction(BuildContext context, DiscoverPageAction action) {
    switch (action) {
      case DiscoverPageAction.home:
        select(0);
      case DiscoverPageAction.my:
        select(2);
      case DiscoverPageAction.watchlist:
        openLibrary();
      case DiscoverPageAction.resume:
        select(0, resume: true);
      case DiscoverPageAction.detail:
        openDrama(context, currentDrama);
    }
  }

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

  void onSystemBack() {
    if (drawerOpen) {
      scaffoldKey.currentState?.closeDrawer();
    } else if (videoImmersive) {
      backRequest++;
      notify();
    } else if (tab != 1) {
      select(1);
    } else {
      openMenu();
    }
  }

  void onDrawerChanged(bool opened) {
    if (drawerOpen == opened) return;
    drawerOpen = opened;
    notify();
  }

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

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

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