import 'package:flutter/cupertino.dart';
import 'package:pull_to_refresh/pull_to_refresh.dart';
import 'package:zhiying_base_widget/widgets/empty/empty_widget.dart';
import 'package:zhiying_base_widget/widgets/refresh/refresh_header/refresh_header.dart';
import 'package:zhiying_comm/zhiying_comm.dart';
import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'package:zhiying_comm/util/custom_sliver_persistent_header_delegate.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'bloc/custom_page_bloc.dart';
import 'bloc/custom_page_state.dart';
import 'bloc/custom_page_event.dart';
import 'bloc/custom_page_repository.dart';
import 'dart:ui';

///
/// 通用模块页面
///
class CustomPage extends StatelessWidget {
  final Map<String, dynamic> data;

  CustomPage(this.data, {Key key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    // return NestedScrollDemoPage();
    return BlocProvider<CustomPageBloc>(
      create: (_) => CustomPageBloc(CustomPageRepository(data: data))..add(CustomPageInitEvent()),
      child: _CommonPageContainer(),
      // ),
    );
  }
}

class _CommonPageContainer extends StatefulWidget {
  @override
  __CommonPageContainerState createState() => __CommonPageContainerState();
}

class __CommonPageContainerState extends State<_CommonPageContainer> with SingleTickerProviderStateMixin {
  ScrollController _controller;
  ScrollController _controller2;
  RefreshController _refreshController;
  TabController _tabController;
  bool _isEnded = false;

  /// 回到顶点
  void _scrollTop() {
    // _controller.jumpTo(0);
    _controller.animateTo(0, duration: Duration(milliseconds: 200), curve: Curves.linear);
  }

  /// 刷新
  void _onRefreshEvent() async {
    BlocProvider.of<CustomPageBloc>(context).add(CustomPageRefreshEvent());
  }

  /// 加载更多
  void _onLoadEvent() async {}

  @override
  void initState() {
    _controller = ScrollController();
    _controller2 = ScrollController();
    _refreshController = RefreshController(initialRefresh: false);
    _tabController = TabController(length: 10, vsync: this);
    super.initState();
  }

  @override
  void dispose() {
    _controller?.dispose();
    _refreshController?.dispose();
    _tabController?.dispose();
    _controller2?.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return MediaQuery.removePadding(
      context: context,
      child: BlocConsumer<CustomPageBloc, CustomPageState>(
        listener: (context, state) {},
        buildWhen: (prev, current) {
          if (current is CustomPageErrorState) {
            return false;
          }
          if (current is CustomPageRefreshSuccessState) {
            _refreshController.refreshCompleted(resetFooterState: true);
            return false;
          }
          if (current is CustomPageRefreshErrorState) {
            _refreshController.refreshFailed();
            return false;
          }
          return true;
        },
        builder: (context, state) {
          // if (state is CustomPageLoadedState) {
          //   return _buildMain2Widget();
          // }
          // if (state is CustomPageInitErrorState) {
          //   return _buildMain2Widget();
          // }
          // return _buildMain2Widget();

          return _buildMain2Widget();
        },
      ),
    );
  }

  /// 有数据
  Widget _buildMainWidget() {
    double top = MediaQueryData.fromWindow(window).padding.top;
    return Scaffold(
      backgroundColor: HexColor.fromHex('#F9F9F9'),
      floatingActionButton: _buildFloatWidget(),
      floatingActionButtonLocation: _CustomFloatingActionButtonLocation(FloatingActionButtonLocation.endFloat, 0, -100),
      body: SmartRefresher(
        enablePullDown: true,
        enablePullUp: false,
        header: RefreshHeader(
          offsetY: top,
        ),
        controller: _refreshController,
        onLoading: _onLoadEvent,
        onRefresh: _onRefreshEvent,
        child: CustomScrollView(
          key: UniqueKey(),
          controller: _controller,
          slivers: [
            /// 标题
            SliverAppBar(
              title: Text('标题'),
              centerTitle: true,
              pinned: true,
            ),


            /// 轮播图
            _buildSliverBanner(),

            /// 搜索
            _buildSearch(),

            /// TAB BAR
            _buildTabbar(),

            SliverFillRemaining(
              child: TabBarView(
                controller: _tabController,
                children: List.generate(10, (index) => Container(
                  height: double.infinity,
                  width: double.infinity,
                  color: Colors.white,
                  child: MediaQuery.removePadding(
                    context: context,
                    removeTop: true,
                    child: CustomScrollView(
                      controller: _controller2,
                      key: UniqueKey(),
                      slivers: <Widget>[
                        _buildQucikEntry(),
                        _buildSearch(),
                        _buildSliverBanner(),
                        _buildGoodsList(),

                      ],
                    ),
                  ),
                )),
              ),
            )

          ],
        ),
      ),
    );
  }

  /// 有数据2
  Widget _buildMain2Widget(){
    return Scaffold(
      appBar: AppBar(title: Text('标题'),centerTitle: true,),
      backgroundColor: HexColor.fromHex('#F9F9F9'),
      floatingActionButton: _buildFloatWidget(),
      floatingActionButtonLocation: _CustomFloatingActionButtonLocation(FloatingActionButtonLocation.endFloat, 0, -100),
        body: Column(
          children: <Widget>[
            Container(height: 40, width: double.infinity, color: Colors.green,),
            Container(
              height: 40,
              width: double.infinity,
              color: Colors.red,
              child: TabBar(
                isScrollable: true,
                controller: _tabController,
                tabs: List.generate(10, (index) => Text('$index')),
              ),
            ),
            Expanded(
              child: TabBarView(
                controller: _tabController,
                children: List.generate(10, (index) => Container(
                  height: double.infinity,
                  width: double.infinity,
                  color: Colors.white,
                  child: MediaQuery.removePadding(
                    context: context,
                    removeTop: true,
                    child: CustomScrollView(
                      controller: _controller,
                      key: UniqueKey(),
                      slivers: <Widget>[
                        _buildQucikEntry(),
                        _buildSearch(),
                        _buildSliverBanner(),
                        _buildSearch(title: '商品列表'),
                        _buildGoodsList(),

                      ],
                    ),
                  ),
                )),
              ),
            )
          ],
        ),
    );
  }

  /// tabBar
  Widget _buildTabbar(){
    return SliverPersistentHeader(
      delegate: CustomSliverPersistentHeaderDelegate(
        max: 40,
        min: 40,
        child: Container(
          height: double.infinity,
          width: double.infinity,
          color: Colors.redAccent,
          child: TabBar(
            isScrollable: true,
            controller: _tabController,
            tabs: List.generate(10, (index) => Text('$index')),
          ),
        ),
      ),
      pinned: true,
    );
  }

  /// 多眼导航
  Widget _buildQucikEntry(){
    return SliverToBoxAdapter(
      child: Container(
        alignment: Alignment.center,
        child: Text('多眼导航'),
        height: 70,
        width: double.infinity,
        color: Colors.green,
      ),
    );
  }

  /// 搜索
  Widget _buildSearch({String title}){
    return SliverPersistentHeader(
      delegate: CustomSliverPersistentHeaderDelegate(
        max: 40,
        min: 40,
        child: Container(
          alignment: Alignment.center,
          child: Text(title ?? '搜索'),
          height: double.infinity,
          width: double.infinity,
          color: Colors.blueAccent,
        ),
      ),
      pinned: true,
    );
  }

  /// 商品列表
  Widget _buildGoodsList(){
    return SliverList(
        delegate: SliverChildBuilderDelegate((context, index) {
          return Container(
            height: 50,
            width: double.infinity,
            color: Colors.green[(index % 9 + 1) * 100],
          );
        }, childCount: 50));
  }

  /// 轮播图
  Widget _buildSliverBanner(){
    return SliverPersistentHeader(
      delegate: CustomSliverPersistentHeaderDelegate(
        max: 140,
        min: 140,
        child: Container(
          child: Text('轮播图'),
          alignment: Alignment.center,
          height: double.infinity,
          width: double.infinity,
          color: Colors.yellowAccent,
        ),
      ),
      pinned: false,
    );
  }

  /// 悬浮按钮
  Widget _buildFloatWidget() {
    return Visibility(
      visible: true,
      child: GestureDetector(
        onTap: ()=> _scrollTop(),
        behavior: HitTestBehavior.opaque,
        child: Container(
          height: 30,
          width: 30,
          color: Colors.redAccent,
        ),
      ),
    );
  }

  /// 骨架图
  Widget _buildSkeletonWidget() {
    return Scaffold();
  }

  /// 空数据视图
  Widget _buildEmptyWidget() {
    return Scaffold(
        backgroundColor: HexColor.fromHex('#F9F9F9'),
        appBar: AppBar(
          brightness: Brightness.light,
          backgroundColor: Colors.white,
          leading: IconButton(
            icon: Icon(
              Icons.arrow_back_ios,
              size: 22,
              color: HexColor.fromHex('#333333'),
            ),
            onPressed: () => Navigator.maybePop(context),
          ),
          title: Text(
            '爆款',
            style: TextStyle(color: HexColor.fromHex('#333333'), fontSize: 15, fontWeight: FontWeight.bold),
          ),
          centerTitle: true,
          elevation: 0,
        ),
        body: Column(
          crossAxisAlignment: CrossAxisAlignment.center,
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Align(
              alignment: Alignment.topCenter,
              child: EmptyWidget(
                tips: '网络似乎开小差了～',
              ),
            ),
            GestureDetector(
              onTap: () => _onRefreshEvent(),
              behavior: HitTestBehavior.opaque,
              child: Container(
                alignment: Alignment.center,
                decoration: BoxDecoration(borderRadius: BorderRadius.circular(10), border: Border.all(color: HexColor.fromHex('#999999'), width: 0.5), color: Colors.white),
                width: 80,
                height: 20,
                child: Text(
                  '刷新一下',
                  style: TextStyle(fontSize: 12, color: HexColor.fromHex('#333333'), fontWeight: FontWeight.bold),
                ),
              ),
            )
          ],
        ));
  }
}

class _CustomFloatingActionButtonLocation extends FloatingActionButtonLocation {
  FloatingActionButtonLocation location;
  double offsetX; // X方向的偏移量
  double offsetY; // Y方向的偏移量
  _CustomFloatingActionButtonLocation(this.location, this.offsetX, this.offsetY);

  @override
  Offset getOffset(ScaffoldPrelayoutGeometry scaffoldGeometry) {
    Offset offset = location.getOffset(scaffoldGeometry);
    return Offset(offset.dx + offsetX, offset.dy + offsetY);
  }
}