import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:hgdj/hj_page/drama/drama_feed_logic.dart';
import 'package:hgdj/hj_page/drama/view/drama_video_player.dart';
import 'package:hgdj/tools_base/loading/loading_center_widget.dart';
import 'package:hgdj/tools_base/unique_tag_mixin.dart';

/// AI短剧信息流页：竖划一部换一部，每条播该剧第 1 集
class DramaFeedPage extends StatefulWidget {
  final TabController? superTabCtr;
  final int? tabIndex;

  const DramaFeedPage({super.key, this.superTabCtr, this.tabIndex});

  @override
  State<DramaFeedPage> createState() => _DramaFeedPageState();
}

class _DramaFeedPageState extends State<DramaFeedPage> with UniqueTagMixin {
  @override
  Widget build(BuildContext context) {
    return GetBuilder<DramaFeedLogic>(
      tag: uniqueTag, // 多 tab 并存，按实例隔离
      init: DramaFeedLogic(
          superTabCtr: widget.superTabCtr, tabIndex: widget.tabIndex),
      builder: (logic) {
        final Widget content;
        if (!logic.isFirstLoaded) {
          content = const LoadingCenterWidget();
        } else if (logic.list?.isNotEmpty != true) {
          content = CErrorWidget(retryOnTap: () => logic.loadData());
        } else {
          content = _buildFeed(logic);
        }
        return Material(color: Colors.transparent, child: content);
      },
    );
  }

  /// 信息流局部刷新：当前页变化时只 update([idFeed])，各 item 重算 isCurrentPage
  Widget _buildFeed(DramaFeedLogic logic) {
    return RefreshIndicator(
      onRefresh: () => logic.loadData(),
      child: GetBuilder<DramaFeedLogic>(
        tag: uniqueTag,
        id: DramaFeedLogic.idFeed,
        // 上下滑动开始/结束 → 切换 isScrolling，各播放器据此隐藏/显示进度条
        builder: (logic) => NotificationListener<ScrollNotification>(
          onNotification: (n) {
            if (n is ScrollStartNotification) {
              logic.isScrolling.value = true;
            } else if (n is ScrollEndNotification) {
              logic.isScrolling.value = false;
            }
            return false;
          },
          child: PageView.builder(
            onPageChanged: logic.onPageChanged,
            physics: const ClampingScrollPhysics(),
            controller: logic.pageCtr,
            scrollDirection: Axis.vertical,
            allowImplicitScrolling: true,
            itemCount: logic.list?.length ?? 0,
            itemBuilder: (context, index) {
              final video = logic.list![index];
              //推荐流不去重，同一部剧会反复下发，光用剧 id 会撞 key(PageView 直接抛 Duplicate keys)；
              //带上下标才唯一。也不能只用下标——下拉刷新后同一个位置换了别的剧，
              //key 不变 PageView 就会复用 State，播放器不重建，播的还是上一部
              return DramaVideoPlayer(
                key: ValueKey('${video.dramaInfo?.id ?? ''}#$index'),
                index: index,
                isCurrentPage: logic.pageIndex == index,
                videoInfo: video,
                isScrolling: logic.isScrolling,
              );
            },
          ),
        ),
      ),
    );
  }
}