///需要登录的异常
class NeedLogin extends HiNetError {
  NeedLogin({int code: 401, String message: '请先登录'}) : super(code, message);
}

///需要授权的异常
class NeedAuth extends HiNetError {
  NeedAuth(String message, {int code: 403, dynamic data})
      : super(code, message, data: data);
}

///网络异常统一格式类
class HiNetError implements Exception {
  final int code;
  final String message;
  final dynamic data;

  HiNetError(this.code, this.message, {this.data});
}

/// 网络请求抽象类
abstract class HiNetAdapter {
  Future<HiNetResponse<T>> send<T>(BaseRequest request);
}

void main() {
  runApp(BiliApp());
}

class BiliApp extends StatefulWidget {
  BiliApp({Key? key}) : super(key: key);

  @override
  _BiliAppState createState() => _BiliAppState();
}

class _BiliAppState extends State<BiliApp> {
  BiliRouteDelegate _routeDelegate = BiliRouteDelegate();

  @override
  Widget build(BuildContext context) {
    // 定义 route
    var widget = Router(
      routerDelegate: _routeDelegate,
    );

    return MaterialApp(
      home: widget,
    );
  }
}

// 框架里 BackButton 源码节选
// 可以不设置 onPressed，让它自动 Navigator 调用返回
Widget build(BuildContext context) {
    assert(debugCheckHasMaterialLocalizations(context));
    return IconButton(
      icon: const BackButtonIcon(),
      color: color,
      tooltip: MaterialLocalizations.of(context).backButtonTooltip,
      onPressed: () {
        if (onPressed != null) {
          onPressed!();
        } else {
          Navigator.maybePop(context);
        }
      },
    );
  }

  Widget build(BuildContext context) {
    return Scaffold(
        body: MediaQuery.removePadding(
      removeTop: Platform.isIOS,
      context: context,
      child: Column(children: [
        // 修复iOS平台状态栏
        NavigationBar(
          color: Colors.black,
          statusStyle: StatusStyle.LIGHT_CONTENT,
          height: Platform.isAndroid ? 0 : 46,
        ),
        _videoView(),
        Text('视频详情页, vid: ${widget.videlModel.vid}'),
        Text('视频详情页, title: ${widget.videlModel.title}'),
      ]),
    ));
  }

// 特别针对 iOS 修复退出全屏问题
void _fullScreenListener() {
  Size size = MediaQuery.of(context).size;
  if (size.width > size.height) {
    OrientationPlugin.forceOrientation(DeviceOrientation.portraitUp);
  }
}

///监听应用生命周期变化
@override
void didChangeAppLifecycleState(AppLifecycleState state) {
  super.didChangeAppLifecycleState(state);
  print(':didChangeAppLifecycleState:$state');
  switch (state) {
    case AppLifecycleState.inactive: // 处于这种状态的应用程序应该假设它们可能在任何时候暂停。
      break;
    case AppLifecycleState.resumed: //从后台切换前台，界面可见
      //fix Android压后台首页状态栏字体颜色变白，详情页状态栏字体变黑问题
      changeStatusBar();
      break;
    case AppLifecycleState.paused: // 界面不可见，后台
      break;
    case AppLifecycleState.detached: // APP结束时调用
      break;
  }
}

void initState() {
  super.initState();

  WidgetsBinding.instance?.addObserver(this);

  _controller = TabController(length: categoryList.length, vsync: this);
  HiNavigator.getInstance().addListener(this.listener = (current, pre) {
    // this._currentPage = current.page;
    print('home:current:${current.page}');
    print('home:pre:${pre.page}');
    if (widget == current.page || current.page is HomePage) {
      print('首页: onResume');
    } else if (widget == pre?.page || pre?.page is HomePage) {
      print('首页: onPause');
    }

    // 当页面返回到首页恢复首页的状态栏样式
    // 为什么出现这个问题，就是视频详情页引起的
    if (pre?.page is VideoDetailPage && !(current.page is ProfilePage)) {
      var statusStyle = StatusStyle.DARK_CONTENT;
      changeStatusBar(color: Colors.white, statusStyle: statusStyle);
    }
  });

  loadData();
}

abstract class HiBaseTabState<M, L, T extends StatefulWidget> extends HiState<T>
    with AutomaticKeepAliveClientMixin {
  int pageInde = 1;
  List<L> dataList = [];
  bool loading = false;

  ScrollController scrollController = ScrollController();

  get contentChild;

  @override
  void initState() {
    super.initState();
    scrollController.addListener(() {
      // 最大可滚动距离 - 当前滚动距离
      var distance = scrollController.position.maxScrollExtent -
          scrollController.position.pixels;
      if (distance < 300 && !loading) {
        loadData(loadMore: true);
      }
    });
    loadData();
  }

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

  @override
  Widget build(BuildContext context) {
    super.build(context);
    return RefreshIndicator(
      child: MediaQuery.removePadding(
        removeTop: true,
        context: context,
        child: contentChild,
      ),
      onRefresh: loadData,
      color: primary,
    );
  }

  /// 根据对应页码获取相应数据
  Future<M> getData(int pageIndex);

  ///从M中解析出list数据
  List<L> parseList(M result);

  Future<void> loadData({loadMore = false}) async {
    if (loading) {
      print("...上次加载还没完成...");
      return;
    }

    loading = true;

    if (!loadMore) {
      pageInde = 1;
    }
    var currentIndex = pageInde + (loadMore ? 1 : 0);
    try {
      var result = await getData(currentIndex);

      setState(() {
        if (loadMore) {
          var newList = parseList(result);
          if (newList.isNotEmpty) {
            dataList = [...dataList, ...newList];
            
            if (newList.length != 0) {
              pageInde++;
            }
          }
        } else {
          dataList = parseList(result);
        }
      });

      Future.delayed(Duration(milliseconds: 1000), () {
        loading = false;
      });
    } on NeedAuth catch (e) {
      loading = false;
      print(e);
      showWarnToast(e.message);
    } on HiNetError catch (e) {
      loading = false;
      print(e);
      showWarnToast(e.message);
    }
  }

  @override
  bool get wantKeepAlive => true;
}