import 'package:easy_refresh/easy_refresh.dart';
import 'package:flutter/material.dart';
import 'package:loopin/IM/im_service.dart';
import 'package:loopin/styles/index.dart';
import 'package:tencent_cloud_chat_sdk/models/v2_tim_group_member_full_info.dart';
import 'package:tencent_cloud_chat_sdk/models/v2_tim_user_full_info.dart';

class InviteActionSheet extends StatefulWidget {
  final String groupID;

  final Function(List<String> selected) onAction;
  final String title;
  final String actionLabel;
  final bool showButton;

  const InviteActionSheet({
    super.key,
    required this.groupID,
    required this.onAction,
    this.title = "",
    this.actionLabel = "确认",
    this.showButton = true,
  });

  @override
  State<InviteActionSheet> createState() => _MemberActionSheetState();
}

class _MemberActionSheetState extends State<InviteActionSheet> {
  String _query = "";
  final Set<String> _selectedIDs = {}; // 选中的 userID 集合
  late List<V2TimUserFullInfo> members = [];
  String nextSeq = '';
  bool hasMore = false;
  bool loading = false;
  //
  @override
  void initState() {
    super.initState();
    getMemberData();
  }

  //互关好友
  Future<void> getMemberData({bool reset = false}) async {
    if (loading) return;
    loading = true;
    final res = await ImService.instance.getMutualFollowersList(
      nextCursor: nextSeq,
    );
    if (res.success && res.data != null) {
      final userInfoList = res.data!.userFullInfoList ?? [];
      final isFinished = res.data!.nextCursor == null || res.data!.nextCursor!.isEmpty;
      logger.w('获取成功：${res.data!.nextCursor},是否还有更多：$isFinished');
      if (isFinished) {
        hasMore = false;
        nextSeq = '';
      } else {
        nextSeq = res.data!.nextCursor ?? '';
        hasMore = nextSeq.isNotEmpty ? true : false;
      }

      final ids = userInfoList.map((item) => item.userID).whereType<String>().toList();
      if (ids.isNotEmpty) {
        getGroupMemberData(userIDs: ids, userList: userInfoList);
      }
    } else {
      logger.e('获取数据失败：${res.desc}');
    }
  }

  //群成员
  Future<void> getGroupMemberData({required List<String> userIDs, required List<V2TimUserFullInfo> userList}) async {
    final res = await ImService.instance.getGroupMembersInfo(
      groupID: widget.groupID,
      memberList: userIDs,
    );

    if (res.success && res.data != null) {
      final List<V2TimGroupMemberFullInfo> groupMemberList = res.data ?? [];
      // 已经在群里的 userID
      final inGroupIds = groupMemberList.map((m) => m.userID).whereType<String>().where((id) => id.isNotEmpty).toSet();
      // 过滤掉已经在群里的
      final notInGroupUsers = userList.where((user) => user.userID != null && !inGroupIds.contains(user.userID)).toList();
      setState(() {
        members.addAll(notInGroupUsers);
      });
    }
    setState(() {
      loading = false;
    });
  }

  String handleText(String? text, String defaultValue) {
    if (text == null || text.trim().isEmpty) return defaultValue;
    return text;
  }

  @override
  Widget build(BuildContext context) {
    // 搜索过滤
    final filteredMembers = members.where((m) {
      final name = m.nickName ?? '';
      return name.contains(_query);
    }).toList();

    return SafeArea(
      child: GestureDetector(
        behavior: HitTestBehavior.translucent, // 点击空白区域也能触发
        onTap: () {
          FocusScope.of(context).unfocus();
        },
        child: Scaffold(
          backgroundColor: Colors.white,
          appBar: AppBar(
            centerTitle: true,
            forceMaterialTransparency: true,
            bottom: PreferredSize(
              preferredSize: const Size.fromHeight(1.0),
              child: Container(
                color: Colors.grey[300],
                height: 1.0,
              ),
            ),
            title: Text(
              widget.title,
              style: TextStyle(fontSize: 18, fontWeight: FontWeight.bold),
            ),
            leading: IconButton(
              icon: const Icon(Icons.arrow_back),
              onPressed: () {
                Navigator.pop(context);
              },
            ),
          ),
          body: Column(
            children: [
              SizedBox(height: 10),
              // 搜索框
              Padding(
                padding: const EdgeInsets.symmetric(horizontal: 16),
                child: TextField(
                  decoration: InputDecoration(
                    prefixIcon: const Icon(Icons.search),
                    hintText: "搜索",
                    contentPadding: const EdgeInsets.symmetric(vertical: 8),
                    border: OutlineInputBorder(borderRadius: BorderRadius.circular(8)),
                  ),
                  onChanged: (value) {
                    setState(() {
                      _query = value.trim();
                    });
                  },
                ),
              ),

              const SizedBox(height: 8),

              // 成员列表
              Expanded(
                child: EasyRefresh(
                  footer: ClassicFooter(
                    dragText: '加载更多',
                    armedText: '释放加载',
                    readyText: '加载中...',
                    processingText: '加载中...',
                    processedText: hasMore ? '加载完成' : '没有更多了～',
                    failedText: '加载失败，请重试',
                    messageText: '最后更新于 %T',
                  ),
                  onLoad: () async {
                    //
                    if (hasMore) {
                      await getMemberData();
                    }
                  },
                  child: ListView.builder(
                    itemCount: filteredMembers.length,
                    itemBuilder: (context, index) {
                      final m = filteredMembers[index];
                      final id = m.userID;
                      final uname = handleText(m.nickName, '');
                      final nickname = handleText(m.nickName, '未知昵称');
                      final showName = uname.isEmpty ? nickname : uname;
                      return InkWell(
                        onTap: () {
                          setState(() {
                            if (_selectedIDs.contains(id)) {
                              _selectedIDs.remove(id);
                            } else if (id != null && id.isNotEmpty) {
                              _selectedIDs.add(id);
                            }
                          });
                        },
                        child: Padding(
                          padding: const EdgeInsets.symmetric(vertical: 8, horizontal: 16),
                          child: Row(
                            children: [
                              // 左侧圆形头像
                              CircleAvatar(
                                radius: 20,
                                backgroundImage: m.faceUrl != null ? NetworkImage(m.faceUrl!) : null,
                                child: m.faceUrl == null ? const Icon(Icons.person) : null,
                              ),
                              const SizedBox(width: 12),

                              // 用户名
                              Expanded(
                                child: Text(
                                  showName,
                                  style: const TextStyle(fontSize: 14),
                                  overflow: TextOverflow.ellipsis,
                                ),
                              ),

                              // 复选框
                              Container(
                                width: 24,
                                height: 24,
                                alignment: Alignment.center,
                                decoration: BoxDecoration(
                                  shape: BoxShape.circle,
                                  border: Border.all(color: _selectedIDs.contains(id) ? FStyle.primaryColor : Colors.grey),
                                  color: _selectedIDs.contains(id) ? FStyle.primaryColor : Colors.transparent,
                                ),
                                child: _selectedIDs.contains(id) ? const Icon(Icons.check, size: 16, color: Colors.white) : null,
                              ),
                            ],
                          ),
                        ),
                      );
                    },
                  ),
                ),
              ),
              // 底部操作按钮
              if (widget.showButton)
                Padding(
                  padding: const EdgeInsets.all(16),
                  child: ElevatedButton(
                    style: ElevatedButton.styleFrom(
                      minimumSize: const Size(double.infinity, 48),
                      backgroundColor: FStyle.primaryColor,
                    ),
                    onPressed: _selectedIDs.isEmpty
                        ? null
                        : () {
                            Navigator.pop(context);
                            widget.onAction(_selectedIDs.toList());
                          },
                    child: Text(
                      "${widget.actionLabel}（${_selectedIDs.length}）",
                      style: TextStyle(
                        color: _selectedIDs.isNotEmpty ? Colors.white : Colors.black,
                      ),
                    ),
                  ),
                ),
            ],
          ),
        ),
      ),
    );
  }
}