import 'package:PiliPlus/common/constants.dart';
import 'package:PiliPlus/common/skeleton/video_card_v.dart';
import 'package:PiliPlus/common/widgets/loading_widget/http_error.dart';
import 'package:PiliPlus/common/widgets/refresh_indicator.dart';
import 'package:PiliPlus/http/loading_state.dart';
import 'package:PiliPlus/models/live/live_follow/item.dart';
import 'package:PiliPlus/pages/live_follow/controller.dart';
import 'package:PiliPlus/pages/live_follow/widgets/live_item_follow.dart';
import 'package:PiliPlus/utils/grid.dart';
import 'package:flutter/material.dart';
import 'package:get/get.dart';

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

  @override
  State<LiveFollowPage> createState() => _LiveFollowPageState();
}

class _LiveFollowPageState extends State<LiveFollowPage> {
  final _controller = Get.put(LiveFollowController());

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Obx(
          () => Text(_controller.count.value != null
              ? '${_controller.count.value}人正在直播'
              : '关注直播'),
        ),
      ),
      body: SafeArea(
        top: false,
        bottom: false,
        child: refreshIndicator(
          onRefresh: _controller.onRefresh,
          child: CustomScrollView(
            slivers: [
              SliverPadding(
                padding: EdgeInsets.only(
                  left: StyleString.safeSpace,
                  right: StyleString.safeSpace,
                  bottom: MediaQuery.paddingOf(context).bottom + 80,
                ),
                sliver: Obx(() => _buildBody(_controller.loadingState.value)),
              ),
            ],
          ),
        ),
      ),
    );
  }

  Widget _buildBody(LoadingState<List<LiveFollowItem>?> loadingState) {
    return switch (loadingState) {
      Loading() => SliverGrid(
          gridDelegate: SliverGridDelegateWithExtentAndRatio(
            mainAxisSpacing: StyleString.cardSpace,
            crossAxisSpacing: StyleString.cardSpace,
            maxCrossAxisExtent: Grid.smallCardWidth,
            childAspectRatio: StyleString.aspectRatio,
            mainAxisExtent: MediaQuery.textScalerOf(context).scale(90),
          ),
          delegate: SliverChildBuilderDelegate(
            (context, index) {
              return const VideoCardVSkeleton();
            },
            childCount: 10,
          ),
        ),
      Success() => loadingState.response?.isNotEmpty == true
          ? SliverGrid(
              gridDelegate: SliverGridDelegateWithExtentAndRatio(
                mainAxisSpacing: StyleString.cardSpace,
                crossAxisSpacing: StyleString.cardSpace,
                maxCrossAxisExtent: Grid.smallCardWidth,
                childAspectRatio: StyleString.aspectRatio,
                mainAxisExtent: MediaQuery.textScalerOf(context).scale(90),
              ),
              delegate: SliverChildBuilderDelegate(
                (context, index) {
                  if (index == loadingState.response!.length - 1) {
                    _controller.onLoadMore();
                  }
                  return LiveCardVFollow(
                    liveItem: loadingState.response![index],
                  );
                },
                childCount: loadingState.response!.length,
              ),
            )
          : HttpError(onReload: _controller.onReload),
      Error() => HttpError(
          errMsg: loadingState.errMsg,
          onReload: _controller.onReload,
        ),
    };
  }
}