dating_touchme_app/lib/pages/message/conversation_tab.dart

import 'package:dating_touchme_app/extension/ex_widget.dart';
import 'package:dating_touchme_app/im/im_manager.dart';
import 'package:dating_touchme_app/pages/message/chat_page.dart';
import 'package:flutter/material.dart';
import 'package:dating_touchme_app/generated/assets.dart';
import 'package:get/get.dart';
import 'package:im_flutter_sdk/im_flutter_sdk.dart';
import '../../controller/message/conversation_controller.dart';

class ConversationTab extends StatefulWidget {
  const ConversationTab({super.key});

  @override
  State<ConversationTab> createState() => _ConversationTabState();
}

class _ConversationTabState extends State<ConversationTab> with AutomaticKeepAliveClientMixin {
  final ConversationController controller = Get.find<ConversationController>();

  @override
  Widget build(BuildContext context) {
    super.build(context);
    return Column(
      children: [
        // 聊天列表
        Expanded(
          child: Obx(() {
            if (controller.isLoading.value) {
              return const Center(child: CircularProgressIndicator());
            }
            
            if (controller.errorMessage.value.isNotEmpty) {
              return Center(
                child: Column(
                  mainAxisAlignment: MainAxisAlignment.center,
                  children: [
                    Text(controller.errorMessage.value),
                    ElevatedButton(
                      onPressed: () => controller.refreshConversations(),
                      child: const Text('重试'),
                    ),
                  ],
                ),
              );
            }
            
            if (controller.conversations.isEmpty) {
              return const Center(child: Text('暂无会话'));
            }
            
            return ListView.builder(
              padding: const EdgeInsets.only(top: 8),
              itemCount: controller.conversations.length,
              itemBuilder: (context, index) {
                final conversation = controller.conversations[index];
                return _buildConversationItem(conversation);
              },
            );
          }),
        ),
      ],
    );
  }

  // 构建会话项
  Widget _buildConversationItem(EMConversation conversation) {
    // 使用FutureBuilder获取未读消息数和最新消息
    return FutureBuilder<EMUserInfo>(
      future: controller.loadContact(conversation.id),
      builder: (context, snapshot) {
        EMUserInfo? userInfo = snapshot.data;
        return FutureBuilder<EMMessage?>(
          future: controller.lastMessage(conversation),
          builder: (context, snapshot) {
            EMMessage? message = snapshot.data;
            return FutureBuilder<int>(
                future: controller.getUnreadCount(conversation),
                builder: (context, snapshot){
                  int unreadCount = snapshot.data ?? 0;
                  return GestureDetector(
                    onTap: () async{
                      Get.to(ChatPage(userId: conversation.id));
                    },
                    child: Container(
                      padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
                      decoration: const BoxDecoration(
                        color: Colors.white,
                        borderRadius: BorderRadius.all(Radius.circular(16)),
                      ),
                      margin: const EdgeInsets.only(bottom: 8, left: 16, right: 16),
                      child: Row(
                        crossAxisAlignment: CrossAxisAlignment.start,
                        children: [
                          // 头像
                          Container(
                            width: 56,
                            height: 56,
                            decoration: BoxDecoration(
                              borderRadius: BorderRadius.circular(28),
                              image: DecorationImage(
                                image: userInfo?.avatarUrl != '' ? NetworkImage(userInfo?.avatarUrl ?? '') : AssetImage(Assets.imagesAvatarsExample),
                                fit: BoxFit.cover,
                              ),
                            ),
                          ),
                          const SizedBox(width: 12),
                          // 会话信息
                          Expanded(
                            child: Column(
                              crossAxisAlignment: CrossAxisAlignment.start,
                              children: [
                                Row(
                                  mainAxisAlignment: MainAxisAlignment.spaceBetween,
                                  children: [
                                    Text(
                                      userInfo?.nickName ?? '联系人',
                                      style: const TextStyle(
                                        fontSize: 16,
                                        fontWeight: FontWeight.w500,
                                        color: Colors.black,
                                      ),
                                    ),
                                    Text(
                                      controller.formatMessageTime(message?.serverTime ?? 0),
                                      style: const TextStyle(
                                        fontSize: 12,
                                        color: Colors.grey,
                                      ),
                                    ),
                                  ],
                                ),
                                const SizedBox(height: 4),
                                Text(
                                  controller.getLastMessageContent(message),
                                  style: const TextStyle(
                                    fontSize: 14,
                                    color: Colors.grey,
                                  ),
                                  overflow: TextOverflow.ellipsis,
                                ),
                              ],
                            ),
                          ),
                          // 未读消息数
                          if (unreadCount > 0)
                            Container(
                              padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 2),
                              decoration: BoxDecoration(
                                color: Colors.red,
                                borderRadius: BorderRadius.circular(10),
                              ),
                              child: Text(
                                unreadCount.toString(),
                                style: const TextStyle(
                                  fontSize: 12,
                                  color: Colors.white,
                                ),
                              ),
                            ),
                        ],
                      ),
                    ),
                  );
                }
            );
          },
        );
      },
    );
  }
  
  @override
  bool get wantKeepAlive => true;
}