import 'package:PiliPalaX/common/widgets/refresh_indicator.dart';
import 'package:PiliPalaX/http/loading_state.dart';
import 'package:easy_debounce/easy_throttle.dart';
import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:PiliPalaX/pages/member_dynamics/index.dart';
import 'package:PiliPalaX/utils/utils.dart';

import '../../common/constants.dart';
import '../../common/widgets/http_error.dart';
import '../../utils/grid.dart';
import '../../utils/storage.dart';
import '../dynamics/widgets/dynamic_panel.dart';
import 'package:waterfall_flow/waterfall_flow.dart';

class MemberDynamicsPage extends StatefulWidget {
  const MemberDynamicsPage({super.key, this.mid});

  final int? mid;

  @override
  State<MemberDynamicsPage> createState() => _MemberDynamicsPageState();
}

class _MemberDynamicsPageState extends State<MemberDynamicsPage>
    with AutomaticKeepAliveClientMixin {
  late MemberDynamicsController _memberDynamicController;
  late int mid;
  late bool dynamicsWaterfallFlow;

  @override
  bool get wantKeepAlive => true;

  @override
  void initState() {
    super.initState();
    mid = widget.mid ?? int.parse(Get.parameters['mid']!);
    final String heroTag = Utils.makeHeroTag(mid);
    _memberDynamicController =
        Get.put(MemberDynamicsController(mid), tag: heroTag);
    dynamicsWaterfallFlow = GStorage.setting
        .get(SettingBoxKey.dynamicsWaterfallFlow, defaultValue: true);
  }

  @override
  Widget build(BuildContext context) {
    super.build(context);
    return widget.mid == null
        ? Scaffold(
            appBar: AppBar(
              titleSpacing: 0,
              centerTitle: false,
              title:
                  Text('Ta的动态', style: Theme.of(context).textTheme.titleMedium),
            ),
            body: _buildBody,
          )
        : _buildBody;
  }

  Widget get _buildBody => refreshIndicator(
        onRefresh: () async {
          await _memberDynamicController.onRefresh();
        },
        child: Obx(
          () => _memberDynamicController.loadingState.value is Loading
              ? Center(
                  child: CircularProgressIndicator(),
                )
              : CustomScrollView(
                  physics: const AlwaysScrollableScrollPhysics(),
                  slivers: [
                    _buildContent(_memberDynamicController.loadingState.value),
                  ],
                ),
        ),
      );

  _buildContent(LoadingState loadingState) {
    return loadingState is Success
        ? SliverPadding(
            padding: EdgeInsets.only(
              bottom: MediaQuery.paddingOf(context).bottom,
            ),
            sliver: dynamicsWaterfallFlow
                ? SliverWaterfallFlow.extent(
                    maxCrossAxisExtent: Grid.maxRowWidth * 2,
                    //cacheExtent: 0.0,
                    crossAxisSpacing: StyleString.safeSpace,
                    mainAxisSpacing: StyleString.safeSpace,

                    /// follow max child trailing layout offset and layout with full cross axis extend
                    /// last child as loadmore item/no more item in [GridView] and [WaterfallFlow]
                    /// with full cross axis extend
                    //  LastChildLayoutType.fullCrossAxisExtend,

                    /// as foot at trailing and layout with full cross axis extend
                    /// show no more item at trailing when children are not full of viewport
                    /// if children is full of viewport, it's the same as fullCrossAxisExtend
                    //  LastChildLayoutType.foot,
                    lastChildLayoutTypeBuilder: (index) {
                      if (index == loadingState.response.length - 1) {
                        EasyThrottle.throttle('member_dynamics',
                            const Duration(milliseconds: 1000), () {
                          _memberDynamicController.onLoadMore();
                        });
                      }
                      return index == loadingState.response.length
                          ? LastChildLayoutType.foot
                          : LastChildLayoutType.none;
                    },
                    children: (loadingState.response as List)
                        .map((item) => DynamicPanel(item: item))
                        .toList(),
                  )
                : SliverCrossAxisGroup(
                    slivers: [
                      const SliverFillRemaining(),
                      SliverConstrainedCrossAxis(
                        maxExtent: Grid.maxRowWidth * 2,
                        sliver: SliverList(
                          delegate: SliverChildBuilderDelegate(
                            (context, index) {
                              if (index == loadingState.response.length - 1) {
                                EasyThrottle.throttle('member_dynamics',
                                    const Duration(milliseconds: 1000), () {
                                  _memberDynamicController.onLoadMore();
                                });
                              }
                              return DynamicPanel(
                                  item: loadingState.response[index]);
                            },
                            childCount: loadingState.response.length,
                          ),
                        ),
                      ),
                      const SliverFillRemaining(),
                    ],
                  ),
          )
        : HttpError(
            errMsg: loadingState is Error ? loadingState.errMsg : null,
            fn: () {
              _memberDynamicController.onReload();
            },
          );
  }
}