dating_touchme_app/lib/pages/home/recommend_tab.dart

import 'package:dating_touchme_app/generated/assets.dart';
import 'package:easy_refresh/easy_refresh.dart';
import 'package:flutter/material.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';
import 'package:get/get.dart';
import 'package:dating_touchme_app/controller/home/home_controller.dart';
import 'package:dating_touchme_app/pages/home/content_card.dart';

/// 推荐列表 Tab
class RecommendTab extends StatefulWidget {
  const RecommendTab({super.key});

  @override
  State<RecommendTab> createState() => _RecommendTabState();
}

class _RecommendTabState extends State<RecommendTab>
    with AutomaticKeepAliveClientMixin {
  final HomeController controller = Get.find<HomeController>();
  late final EasyRefreshController _refreshController;

  final ScrollController _scrollController = ScrollController();

  bool _shrink = false;

  @override
  void initState() {
    super.initState();
    _refreshController = EasyRefreshController(controlFinishRefresh: true, controlFinishLoad: true);


    _scrollController.addListener(_onScroll);
  }

  @override
  void dispose() {
    _refreshController.dispose();
    super.dispose();
  }


  void _onScroll() {
    final offset = _scrollController.offset;

    final shouldShrink = offset > 200;

    if (shouldShrink != _shrink) {
      setState(() {
        _shrink = shouldShrink;
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    super.build(context);
    // 获取底部安全区域高度和 tabbar 高度（约64）
    final bottomPadding = MediaQuery.of(context).padding.bottom;
    final tabBarHeight = 64.0;
    final totalBottomPadding = bottomPadding + tabBarHeight;
    return Stack(
      children: [
        Obx(() {
          if (controller.recommendIsLoading.value && controller.recommendFeed.isEmpty) {
            return Center(
              child: Column(
                mainAxisAlignment: MainAxisAlignment.center,
                children: [
                  CircularProgressIndicator(),
                  SizedBox(height: 16),
                  Text('加载数据中...'),
                ],
              ),
            );
          }
          return EasyRefresh(
              controller: _refreshController,
              header: const ClassicHeader(
                  dragText: '下拉刷新',
                  armedText: '释放刷新',
                  readyText: '刷新中...',
                  processingText: '刷新中...',
                  processedText: '刷新完成',
                  failedText: '刷新失败',
                  noMoreText: '没有更多数据',
                  showMessage: false
              ),
              footer: ClassicFooter(
                  dragText: '上拉加载',
                  armedText: '释放加载',
                  readyText: '加载中...',
                  processingText: '加载中...',
                  processedText: '加载完成',
                  failedText: '加载失败',
                  noMoreText: '没有更多数据',
                  showMessage: false
              ),
              // 下拉刷新
              onRefresh: () async {
                print('推荐列表下拉刷新被触发');
                try {
                  await controller.refreshRecommendData();
                  print( '推荐列表刷新完成, hasMore: $controller.recommendHasMore.value');
                  _refreshController.finishRefresh();
                  _refreshController.resetFooter();
                } catch (e) {
                  print('推荐列表刷新失败: $e');
                  _refreshController.finishRefresh(IndicatorResult.fail);
                }
              },
              // 上拉加载更多
              onLoad: () async {
                print('推荐列表上拉加载被触发, hasMore: $controller.recommendHasMore.value');
                try {
                  await controller.loadRecommendMoreData();
                  // 完成加载，根据是否有更多数据决定
                  if (controller.recommendHasMore.value) {
                    _refreshController.finishLoad(IndicatorResult.success);
                    print('推荐列表加载更多成功');
                  } else {
                    _refreshController.finishLoad(IndicatorResult.noMore);
                    print('推荐列表没有更多数据了');
                  }
                } catch (e) {
                  print('推荐列表加载更多失败: $e');
                  _refreshController.finishLoad(IndicatorResult.fail);
                }
              },
              child: ListView.separated(
                controller: _scrollController,
                // 关键：始终允许滚动，即使内容不足
                // 移除顶部 padding，让刷新指示器可以正确显示在 AppBar 下方
                padding: EdgeInsets.only(left: 12, right: 12),
                itemBuilder: (context, index) {
                  // 空数据状态
                  if (controller.recommendFeed.isEmpty && index == 0) {
                    // 使用足够的高度确保可以滚动
                    if (controller.recommendIsLoading.value) {
                      return Center(
                        child: Column(
                          mainAxisAlignment: MainAxisAlignment.center,
                          children: [
                            CircularProgressIndicator(),
                            SizedBox(height: 16),
                            Text('加载数据中...'),
                          ],
                        ),
                      );
                    } else {
                      return Center(
                        child: Column(
                          mainAxisAlignment: MainAxisAlignment.center,
                          children: [
                            Text('暂无数据'),
                          ],
                        ),
                      );
                    }
                  }
                  // 数据项
                  final item = controller.recommendFeed[index];
                  return ContentCard(item: item);
                },
                separatorBuilder: (context, index) {
                  // 空状态或加载状态时不显示分隔符
                  if (controller.recommendFeed.isEmpty) {
                    return const SizedBox.shrink();
                  }
                  return const SizedBox(height: 12);
                },
                // 至少显示一个 item（用于显示加载或空状态）
                itemCount: controller.recommendFeed.isEmpty ? 1 : controller.recommendFeed.length,
              )
          );
        }),
        Positioned(
          right: 0,
          bottom: 42, 
          child: Obx(() {
            return AnimatedContainer(
              duration: const Duration(milliseconds: 250),
              width: _shrink ? 50 : 142,
              height: 50,
              padding: EdgeInsets.all(5),
              decoration: BoxDecoration(
                borderRadius: BorderRadius.all(Radius.circular(50)),
                gradient: LinearGradient(
                  begin: Alignment.centerLeft,
                  end: Alignment.centerRight,
                  colors: [
                    Color(0xFF8359FF),
                    Color(0xFF3D8AE0),
                  ],
                ),
              ),
              child: Row(
                children: [
                  ClipRRect(
                    borderRadius: BorderRadius.all(Radius.circular(40)),
                    child: Image.asset(
                      Assets.imagesUserAvatar,
                      width: 40,
                      height: 40,
                    ),
                  ),
                  if(!_shrink) SizedBox(width: 4,),
                  if(!_shrink) Column(
                    children: [
                      Text(
                        "与你匹配的",
                        style: TextStyle(
                          fontSize: 15,
                          color: Colors.white
                        ),
                      ),
                      Text(
                        "${controller.cityCode.value ?? 0}人正在连麦...",
                        style: TextStyle(
                            fontSize: 11,
                            color: Colors.white
                        ),
                      )
                    ],
                  )
                ],
              ),
            );
          }),
        )
      ],
    );
  }

  @override
  bool get wantKeepAlive => true;
}