import 'dart:async';

import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:hgdj/hj_utils/const.dart';
import 'package:hgdj/tools_base/event_bus/events.dart';
import 'package:hgdj/tools_base/widget/scroll_positioned_list/src/scrollable_positioned_list.dart';

import '../../../hj_model/acg/comic_chapters_model.dart';
import '../../../hj_model/cartoon_media_info.dart';
import '../../../hj_utils/api_service/acg_service.dart';
import '../../hj_utils/history_util.dart';
import '../../tools_base/event_bus/event_bus_util.dart';
import 'cartoon_read_page.dart';
import 'widget/acg_source_manager.dart';
import 'widget/cartoon_subset_alert.dart';

class CartoonDetailLogic extends GetxController
    with GetTickerProviderStateMixin {
  String? id;
  CartoonMediaInfo? mediaInfo;

  bool showHeader = true;
  double showOffset = 245;
  bool get isCartoonType => manager.mediaInfo?.mediaType == 'image'; //是否是动画

  // 推荐 tab 固定 3 个（漫画/视频/动漫），顺序由页面按当前内容类型动态排
  late TabController tabCtr = TabController(length: 3, vsync: this);

  late ScrollController scrollCtr = ScrollController()
    ..addListener(() {
      //滚过阈值切换顶部沉浸 header,状态变了才刷新
      final show = scrollCtr.offset <= showOffset;
      if (show != showHeader) {
        showHeader = show;
        update(['header']);
      }
    });
  final ItemScrollController itemSCtrl = ItemScrollController();
  late ACGSourceManager manager;
  late StreamSubscription subscription;

  CartoonDetailLogic({this.id})
      : manager = ACGSourceManager(id ?? ''); //初始化，加载子集

  @override
  void onReady() async {
    super.onReady();
    // subscription 是 late，必须在任何 await 前初始化，
    // 否则详情加载途中退出会让 onClose 的 cancel() 打到未初始化字段而崩
    subscription = eventBus.on<ACGMenuChanged>((event) {
      //列表未 attach(未 build/布局完)时 jumpTo 内部会 ! 取空崩溃,加保护
      if (itemSCtrl.isAttached) {
        itemSCtrl.jumpTo(index: event.index ?? 0);
      }
    });
    // 先拿详情（含 freeEpisode），再拉子集，才能正确标记前 N 集免费
    await loadData();
    manager.fetchAllEpisodes();
  }

  @override
  void onClose() {
    subscription.cancel();
    eventBus.off(subscription);
    tabCtr.dispose(); //修复泄漏
    scrollCtr.dispose(); //修复泄漏
    // manager 由页面的 ChangeNotifierProvider(create:) 在卸载时 dispose,本类不再重复释放
    super.onClose();
  }

  //获取媒体详情
  Future loadData() async {
    mediaInfo = await ACGService.getMediaInfo(id ?? '');
    if (mediaInfo != null) {
      HistoryUtil.insert(mediaInfo!, MediaStyle.Comics);
      manager.mediaInfo = mediaInfo;
      showOffset = mediaInfo?.mediaType == 'text' ? 300 : 320;
    } else {
      mediaInfo = CartoonMediaInfo();
    }
    update();
  }

  //切换集数
  changeEpisode(int episode, bool jump) async {
    manager.changeEpisodesIndex(episode, jump: jump);
    play(); //播放
  }

  play() async {
    //判断权限
    ComicChapterInfo? info =
        await manager.getEpisodeHasPermisson(manager.index);
    if (info == null) return;
    Get.to(() => CartoonReadPage(manager: manager..index = manager.index));
  }

  //集数弹窗
  onMenuAction() async {
    int episode = await Get.bottomSheet(
      CartoonSubSetAlert(sourceManager: manager),
      barrierColor: Colors.black.withValues(alpha: .2),
    );
    if (episode > -1) {
      changeEpisode(episode, true);
    }
  }
}