flutter/lib/IM/controller/chat_controller.dart

import 'package:get/get.dart';
import 'package:loopin/IM/im_service.dart';
import 'package:loopin/models/conversation_type.dart' as myConversationType;
import 'package:loopin/models/conversation_view_model.dart';
import 'package:tencent_cloud_chat_sdk/models/v2_tim_conversation.dart';
import 'package:tencent_cloud_chat_sdk/models/v2_tim_conversation_filter.dart';

class ChatController extends GetxController {
  RxInt count = 20.obs; // 每页条数
  RxString nextSeq = '0'.obs; // 页码
  RxBool isFinished = false.obs; // 是否拉取完？默认未拉取完

  final chatList = <ConversationViewModel>[].obs;

  void initChatData() {
    // chatList.value = <ConversationViewModel>[];
    chatList.clear();
    nextSeq.value = '0';
    isFinished.value = false;
  }

  // 获取所有会话列表
  Future<void> getConversationList() async {
    logger.e('开始获取会话列表数据');
    if (isFinished.value) {
      // 拉取完数据了，直接结束
      logger.e('会话触底无数据');
      return;
    }
    try {
      final res = await ImService.instance.getConversationList(nextSeq.value, count.value);

      if (!res.success || res.data == null) {
        logger.e('获取会话失败::${res.desc}');
        return;
      }

      final List<ConversationViewModel> convList = res.data;
      for (var conv in convList) {
        logger.w('基本会话: ${conv.conversation.toLogString()}');
      }

      chatList.addAll(convList);
      // 不包含noFriend才执行加载数据逻辑,分页加载时候过滤
      final hasNoFriend = chatList.any((item) => item.conversation.conversationGroupList?.contains(myConversationType.ConversationType.noFriend.name) ?? false);
      logger.e('开始构建陌生人入口是否包含noFriend?：$hasNoFriend');
      if (!hasNoFriend) {
        getNoFriendData();
      }
    } catch (e) {
      logger.e('获取会话异常：:$e');
    }
  }

  ///构建陌生人消息菜单入口
  void getNoFriendData({V2TimConversation? csion}) async {
    // 检测会话列表是否已有陌生人消息菜单
    final hasNoFriend = chatList.any((item) => item.conversation.conversationGroupList?.contains(myConversationType.ConversationType.noFriend.name) ?? false);
    logger.w('检测是否存在nofriend入口：$hasNoFriend');
    if (hasNoFriend) {
      // 已经有了入口
      final ConversationViewModel matchItem = chatList.firstWhere(
        (item) => item.conversation.conversationGroupList?.contains(myConversationType.ConversationType.noFriend.name) ?? false,
      );
      // 获取陌生人未读总数
      final unreadTotal = await ImService.instance.getUnreadMessageCountByFilter(
        filter: V2TimConversationFilter(
          conversationGroup: myConversationType.ConversationType.noFriend.name,
          hasUnreadCount: true,
        ),
      );
      matchItem.conversation.lastMessage = csion!.lastMessage;
      matchItem.conversation.unreadCount = unreadTotal.data;
      chatList.refresh();
    } else {
      // 没有则执行创建逻辑
      final res = await ImService.instance.getConversationListByFilter(
        filter: V2TimConversationFilter(conversationGroup: myConversationType.ConversationType.noFriend.name),
        nextSeq: 0,
        count: 1,
      );
      if (res.success && res.data != null) {
        final convList = res.data!.conversationList ?? [];
        if (convList.isNotEmpty) {
          // logger.i(res.data!.toJson());
          // 有陌生人消息，1.获取未读数，2.组装converstaionviewmodel
          final unread = await ImService.instance.getUnreadMessageCountByFilter(
            filter: V2TimConversationFilter(
              conversationGroup: myConversationType.ConversationType.noFriend.name,
              hasUnreadCount: true,
            ),
          );
          if (unread.success) {
            final conv = convList.first;
            final faceUrl = 'assets/images/notify/msr.png';
            conv.showName = '陌生人消息';
            conv.unreadCount = unread.data;
            final createItem = ConversationViewModel(
              conversation: conv,
              faceUrl: faceUrl,
            );
            final newList = List<ConversationViewModel>.from(chatList);
            newList.add(createItem);
            newList.sort((a, b) {
              final atime = a.conversation.lastMessage?.timestamp ?? 0;
              final btime = b.conversation.lastMessage?.timestamp ?? 0;
              return btime.compareTo(atime); // 降序
            });
            chatList.value = newList;
          }
        }
      }
    }
  }

  /// 按会话分组查询 getConversationListByFilter
  // void filterConversationList() async {
  //   final res = await ImService.instance.getConversationListByFilter(
  //     filter: V2TimConversationFilter(conversationGroup: null),
  //     nextSeq: nextSeq.value,
  //   );
  //   final convList = res.data!.conversationList;
  //   logger.i(res.data!.toJson());
  //   chatList.value = convList;
  //   // for (var element in convList ?? []) {
  //   //   logger.i(element.toJson());
  //   //   // 你可以在这里继续处理 element
  //   // }
  // }
}