import 'package:PiliPlus/common/skeleton/video_reply.dart';
import 'package:PiliPlus/common/widgets/custom_sliver_persistent_header_delegate.dart';
import 'package:PiliPlus/common/widgets/loading_widget/http_error.dart';
import 'package:PiliPlus/common/widgets/refresh_indicator.dart';
import 'package:PiliPlus/common/widgets/view_safe_area.dart';
import 'package:PiliPlus/grpc/bilibili/main/community/reply/v1.pb.dart'
    show ReplyInfo;
import 'package:PiliPlus/http/loading_state.dart';
import 'package:PiliPlus/pages/main_reply/controller.dart';
import 'package:PiliPlus/pages/video/reply/widgets/reply_item_grpc.dart';
import 'package:PiliPlus/pages/video/reply_reply/view.dart';
import 'package:PiliPlus/utils/feed_back.dart';
import 'package:PiliPlus/utils/num_utils.dart';
import 'package:PiliPlus/utils/utils.dart';
import 'package:easy_debounce/easy_throttle.dart';
import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart' show ScrollDirection;
import 'package:get/get.dart';

class MainReplyPage extends StatefulWidget {
  const MainReplyPage({super.key});

  @override
  State<MainReplyPage> createState() => _MainReplyPageState();

  static void toMainReplyPage({
    required int oid,
    required int replyType,
  }) {
    Get.toNamed(
      '/mainReply',
      arguments: {
        'oid': oid,
        'replyType': replyType,
      },
    );
  }
}

class _MainReplyPageState extends State<MainReplyPage> {
  final _controller = Get.put(
    MainReplyController(),
    tag: Utils.generateRandomString(8),
  );

  late EdgeInsets padding;

  @override
  void didChangeDependencies() {
    super.didChangeDependencies();
    padding = MediaQuery.viewPaddingOf(context);
  }

  @override
  Widget build(BuildContext context) {
    final colorScheme = ColorScheme.of(context);
    return Scaffold(
      appBar: AppBar(
        title: const Text('查看评论'),
      ),
      body: NotificationListener<UserScrollNotification>(
        onNotification: (notification) {
          final direction = notification.direction;
          if (direction == ScrollDirection.forward) {
            _controller.showFab();
          } else if (direction == ScrollDirection.reverse) {
            _controller.hideFab();
          }
          return false;
        },
        child: refreshIndicator(
          onRefresh: _controller.onRefresh,
          child: Padding(
            padding: EdgeInsets.only(
              left: padding.left,
              right: padding.right,
            ),
            child: CustomScrollView(
              slivers: [
                buildReplyHeader(colorScheme),
                Obx(
                  () => _buildBody(colorScheme, _controller.loadingState.value),
                ),
              ],
            ),
          ),
        ),
      ),
      floatingActionButton: SlideTransition(
        position: _controller.fabAnim,
        child: FloatingActionButton(
          heroTag: null,
          onPressed: () {
            try {
              feedBack();
              _controller.onReply(
                context,
                oid: _controller.oid,
                replyType: _controller.replyType,
              );
            } catch (_) {}
          },
          tooltip: '评论',
          child: const Icon(Icons.reply),
        ),
      ),
    );
  }

  Widget _buildBody(
    ColorScheme colorScheme,
    LoadingState<List<ReplyInfo>?> loadingState,
  ) {
    return switch (loadingState) {
      Loading() => SliverPrototypeExtentList.builder(
        itemCount: 10,
        itemBuilder: (_, _) => const VideoReplySkeleton(),
        prototypeItem: const VideoReplySkeleton(),
      ),
      Success(:var response) =>
        response?.isNotEmpty == true
            ? SliverList.builder(
                itemCount: response!.length + 1,
                itemBuilder: (context, index) {
                  if (index == response.length) {
                    _controller.onLoadMore();
                    return Container(
                      alignment: Alignment.center,
                      margin: EdgeInsets.only(bottom: padding.bottom),
                      height: 125,
                      child: Text(
                        _controller.isEnd ? '没有更多了' : '加载中...',
                        style: TextStyle(
                          fontSize: 12,
                          color: colorScheme.outline,
                        ),
                      ),
                    );
                  } else {
                    return ReplyItemGrpc(
                      replyItem: response[index],
                      replyLevel: 1,
                      replyReply: (replyItem, id) =>
                          replyReply(context, replyItem, id, colorScheme),
                      onReply: (replyItem) => _controller.onReply(
                        context,
                        replyItem: replyItem,
                      ),
                      onDelete: (item, subIndex) =>
                          _controller.onRemove(index, item, subIndex),
                      upMid: _controller.upMid,
                      onCheckReply: (item) =>
                          _controller.onCheckReply(item, isManual: true),
                      onToggleTop: (item) => _controller.onToggleTop(
                        item,
                        index,
                        _controller.oid,
                        _controller.replyType,
                      ),
                    );
                  }
                },
              )
            : HttpError(
                errMsg: '还没有评论',
                onReload: _controller.onReload,
              ),
      Error(:final errMsg) => HttpError(
        errMsg: errMsg,
        onReload: _controller.onReload,
      ),
    };
  }

  Widget buildReplyHeader(ColorScheme colorScheme) {
    final secondary = colorScheme.secondary;
    return SliverPersistentHeader(
      floating: true,
      delegate: CustomSliverPersistentHeaderDelegate(
        extent: 45,
        bgColor: colorScheme.surface,
        child: Container(
          height: 45,
          padding: const EdgeInsets.only(left: 12, right: 6),
          child: Row(
            mainAxisAlignment: MainAxisAlignment.spaceBetween,
            children: [
              Obx(
                () {
                  final count = _controller.count.value;
                  return Text(
                    '${count == -1 ? 0 : NumUtils.numFormat(count)}条回复',
                  );
                },
              ),
              SizedBox(
                height: 35,
                child: TextButton.icon(
                  onPressed: _controller.queryBySort,
                  icon: Icon(
                    Icons.sort,
                    size: 16,
                    color: secondary,
                  ),
                  label: Obx(
                    () => Text(
                      _controller.sortType.value.label,
                      style: TextStyle(fontSize: 13, color: secondary),
                    ),
                  ),
                ),
              ),
            ],
          ),
        ),
      ),
    );
  }

  void replyReply(
    BuildContext context,
    ReplyInfo replyItem,
    int? id,
    ColorScheme colorScheme,
  ) {
    EasyThrottle.throttle('replyReply', const Duration(milliseconds: 500), () {
      int oid = replyItem.oid.toInt();
      int rpid = replyItem.id.toInt();
      Get.to(
        Scaffold(
          resizeToAvoidBottomInset: false,
          appBar: AppBar(
            title: const Text('评论详情'),
            shape: Border(
              bottom: BorderSide(
                color: colorScheme.outline.withValues(alpha: 0.1),
              ),
            ),
          ),
          body: ViewSafeArea(
            child: VideoReplyReplyPanel(
              enableSlide: false,
              id: id,
              oid: oid,
              rpid: rpid,
              isVideoDetail: false,
              replyType: _controller.replyType,
              firstFloor: replyItem,
            ),
          ),
        ),
        routeName: 'dynamicDetail-Copy',
      );
    });
  }
}