PiliPlus/lib/pages/search_panel/view.dart

import 'package:PiliPlus/common/constants.dart';
import 'package:PiliPlus/common/skeleton/media_bangumi.dart';
import 'package:PiliPlus/common/skeleton/msg_feed_top.dart';
import 'package:PiliPlus/common/skeleton/video_card_h.dart';
import 'package:PiliPlus/common/skeleton/video_card_v.dart';
import 'package:PiliPlus/common/widgets/http_error.dart';
import 'package:PiliPlus/common/widgets/refresh_indicator.dart';
import 'package:PiliPlus/http/loading_state.dart';
import 'package:PiliPlus/models/search/result.dart';
import 'package:PiliPlus/utils/grid.dart';
import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:PiliPlus/models/common/search_type.dart';

import 'controller.dart';

abstract class CommonSearchPanel extends StatefulWidget {
  const CommonSearchPanel({
    super.key,
    required this.keyword,
    required this.searchType,
    required this.tag,
    this.hasHeader = false,
  });

  final String keyword;
  final SearchType searchType;
  final String tag;
  final bool hasHeader;
}

abstract class CommonSearchPanelState<
    S extends CommonSearchPanel,
    R extends SearchNumData<T>,
    T> extends State<S> with AutomaticKeepAliveClientMixin {
  SearchPanelController<R, T> get controller;

  @override
  bool get wantKeepAlive => true;

  @override
  Widget build(BuildContext context) {
    super.build(context);
    return refreshIndicator(
      onRefresh: () async {
        await controller.onRefresh();
      },
      child: SafeArea(
        bottom: false,
        child: CustomScrollView(
          controller: controller.scrollController,
          physics: const AlwaysScrollableScrollPhysics(),
          slivers: [
            if (widget.hasHeader)
              Obx(() => buildHeader(controller.loadingState.value)),
            Obx(() => _buildBody(controller.loadingState.value)),
          ],
        ),
      ),
    );
  }

  Widget buildHeader(LoadingState<List<T>?> loadingState) {
    throw UnimplementedError();
  }

  Widget get _builLoading {
    return SliverGrid(
      gridDelegate: switch (widget.searchType) {
        SearchType.media_bangumi ||
        SearchType.media_ft =>
          SliverGridDelegateWithExtentAndRatio(
            mainAxisSpacing: 2,
            maxCrossAxisExtent: Grid.smallCardWidth * 2,
            childAspectRatio: StyleString.aspectRatio * 1.5,
            minHeight: MediaQuery.textScalerOf(context).scale(155),
          ),
        SearchType.live_room => SliverGridDelegateWithExtentAndRatio(
            mainAxisSpacing: StyleString.cardSpace,
            crossAxisSpacing: StyleString.cardSpace,
            maxCrossAxisExtent: Grid.smallCardWidth,
            childAspectRatio: StyleString.aspectRatio,
            mainAxisExtent: MediaQuery.textScalerOf(context).scale(90),
          ),
        SearchType.bili_user => SliverGridDelegateWithMaxCrossAxisExtent(
            maxCrossAxisExtent: Grid.smallCardWidth * 2,
            mainAxisExtent: 66,
          ),
        _ => Grid.videoCardHDelegate(context),
      },
      delegate: SliverChildBuilderDelegate(
        (context, index) {
          switch (widget.searchType) {
            case SearchType.media_bangumi || SearchType.media_ft:
              return const MediaBangumiSkeleton();
            case SearchType.bili_user:
              return const MsgFeedTopSkeleton();
            case SearchType.live_room:
              return const VideoCardVSkeleton();
            default:
              return const VideoCardHSkeleton();
          }
        },
        childCount: 16,
      ),
    );
  }

  Widget _buildBody(LoadingState<List<T>?> loadingState) {
    return switch (loadingState) {
      Loading() => widget.searchType == SearchType.live_room
          ? SliverPadding(
              padding: const EdgeInsets.only(
                left: StyleString.cardSpace,
                right: StyleString.cardSpace,
              ),
              sliver: _builLoading,
            )
          : _builLoading,
      Success() => loadingState.response?.isNotEmpty == true
          ? buildList(loadingState.response!)
          : HttpError(
              callback: controller.onReload,
            ),
      Error() => HttpError(
          errMsg: loadingState.errMsg,
          callback: controller.onReload,
        ),
      _ => throw UnimplementedError(),
    };
  }

  Widget buildList(List<T> list);
}