<template>
  <view class="message-page">

    <!-- 消息列表 -->
    <scroll-view class="message-list" scroll-y="true" refresher-enabled :refresher-triggered="refreshing"
      @refresherrefresh="handleRefresh" @scrolltolower="handleLoadMore">
      <!-- 加载状态 -->
      <view v-if="loading && conversationList.length === 0" class="loading-container">
        <text class="loading-text">加载中...</text>
      </view>
      <!-- 消息列表项 -->
      <view v-for="conversation in conversationList" :key="conversation.groupID || conversation.conversationID"
        class="message-item" @click="handleClickConversation(conversation)">
        <view class="avatar-container">
          <GroupAvatar :avatarList="getAvatarList(conversation.groupID)" :size="96" classType="square" />
          <view v-if="conversation.unreadCount > 0" class="unread-badge">
            <text class="unread-text">{{
              conversation.unreadCount > 99 ? "99+" : conversation.unreadCount
            }}</text>
          </view>
        </view>

        <view class="content">
          <view class="header">
            <text class="name">{{ conversation.teamName }}</text>

            <text class="time">{{
              formatMessageTime(conversation.lastMessageTime)
            }}</text>
          </view>
          <view class="patient-info">
            咨询人 | {{ conversation.patientName }}
          </view>
          <view class="message-preview">
            <text class="preview-text">{{
              cleanMessageText(conversation.lastMessage) || "暂无消息"
            }}</text>
          </view>
        </view>
      </view>

      <!-- 空状态 -->
      <view v-if="!loading && conversationList.length === 0" class="empty-container">
        <image class="empty-image" src="/static/empty.svg" mode="aspectFit" />
        <text class="empty-text">暂无消息</text>
      </view>

      <!-- 加载更多 -->
      <view v-if="hasMore && conversationList.length > 0" class="load-more">
        <text class="load-more-text">{{
          loadingMore ? "加载中..." : "上拉加载更多"
        }}</text>
      </view>
    </scroll-view>
  </view>
</template>

<script setup>
import { ref, computed, onUnmounted, watch } from "vue";
import { onLoad, onShow, onHide } from "@dcloudio/uni-app";
import { storeToRefs } from "pinia";
import useAccountStore from "@/store/account.js";
import { globalTimChatManager } from "@/utils/tim-chat.js";
import { mergeConversationWithGroupDetails } from "@/utils/conversation-merger.js";
import { globalUnreadListenerManager } from "@/utils/global-unread-listener.js";
import useGroupAvatars from "./hooks/use-group-avatars.js";
import GroupAvatar from "@/components/group-avatar.vue";

// 获取登录状态
const { account, openid, isIMInitialized, hasImCorpId } = storeToRefs(useAccountStore());
const { initIMAfterLogin } = useAccountStore();

// 状态
const conversationList = ref([]);
const loading = ref(false);
const loadingMore = ref(false);
const hasMore = ref(false);
const refreshing = ref(false);

// 群聊头像管理
const { loadGroupAvatars, getAvatarList } = useGroupAvatars();

// 计算总未读消息数
const totalUnreadCount = computed(() => {
  return conversationList.value.reduce(
    (sum, conv) => sum + (conv.unreadCount || 0),
    0
  );
});

// 立即更新未读徽章
const updateUnreadBadgeImmediately = async () => {
  try {
    if (!globalTimChatManager || !globalTimChatManager.tim) {
      console.warn("TIM实例不存在，无法更新徽章");
      return;
    }

    const response = await globalTimChatManager.tim.getConversationList();

    if (!response || !response.data || !response.data.conversationList) {
      console.warn("获取会话列表返回数据异常");
      return;
    }

    // 计算群聊总未读数
    const totalUnreadCount = response.data.conversationList
      .filter(
        (conv) => conv.conversationID && conv.conversationID.startsWith("GROUP")
      )
      .reduce((sum, conv) => sum + (conv.unreadCount || 0), 0);
    try {
      if (totalUnreadCount > 0) {
        uni.setTabBarBadge({
          index: 1,
          text: totalUnreadCount > 99 ? "99+" : String(totalUnreadCount),
        });
        console.log("已更新 tabBar 徽章:", totalUnreadCount);
      } else {
        uni.setTabBarBadge({
          index: 1,
          text: "",
        });
        console.log("已清除 tabBar 徽章");
      }
    } catch (badgeError) {
      console.error("更新TabBar徽章失败:", badgeError);
    }
  } catch (error) {
    console.error("更新未读徽章失败:", error);
  }
};

// 初始化IM
const initIM = async () => {
  console.log("=== message.vue initIM 开始 ===");
  console.log("isIMInitialized:", isIMInitialized.value);
  console.log("globalTimChatManager 存在:", !!globalTimChatManager);
  console.log("globalTimChatManager.tim 存在:", !!globalTimChatManager?.tim);
  console.log(
    "globalTimChatManager.isLoggedIn:",
    globalTimChatManager?.isLoggedIn
  );

  if (!isIMInitialized.value) {
    console.log("开始调用 initIMAfterLogin");
    const success = await initIMAfterLogin();
    console.log("initIMAfterLogin 返回:", success);

    if (!success) {
      console.log("initIMAfterLogin 失败，跳过 IM 初始化");
      return false;
    }

    console.log("initIMAfterLogin 成功后检查:");
    console.log("- globalTimChatManager 存在:", !!globalTimChatManager);
    console.log(
      "- globalTimChatManager.tim 存在:",
      !!globalTimChatManager?.tim
    );
    console.log(
      "- globalTimChatManager.isLoggedIn:",
      globalTimChatManager?.isLoggedIn
    );
  } else if (globalTimChatManager && !globalTimChatManager.isLoggedIn) {
    console.log("IM 已初始化但未登录，尝试重连");
    const reconnected = await globalTimChatManager.ensureIMConnection();

    if (!reconnected) {
      console.log("重连失败");
      return false;
    }
  }

  console.log("=== message.vue initIM 完成 ===");
  return true;
};

// 加载会话列表
const loadConversationList = async () => {
  if (loading.value) return;
  // loading.value = true;

  try {
    console.log("开始加载群聊列表");

    // 验证 IM 管理器和 TIM 实例是否存在
    if (!globalTimChatManager) {
      console.log("IM管理器未初始化，跳过加载");
      return;
    }

    if (!globalTimChatManager.tim) {
      console.log("TIM实例不存在，尝试重新初始化");
      const imReady = await initIM();
      if (!imReady || !globalTimChatManager.tim) {
        console.log("TIM实例初始化失败，跳过加载");
        return;
      }
    }

    if (!globalTimChatManager.getGroupList) {
      console.log("getGroupList 方法不存在，跳过加载");
      return;
    }

    // 直接调用getGroupList，它会自动等待SDK就绪
    const result = await globalTimChatManager.getGroupList();
    if (result && result.success && result.groupList) {
      // 合并后端群组详细信息（已包含格式化和排序）
      conversationList.value = await mergeConversationWithGroupDetails(
        result.groupList
      );
      console.log(
        "群聊列表加载成功，共",
        conversationList.value.length,
        "个会话"
      );

      // 加载所有群聊的头像
      await loadGroupAvatars(conversationList.value);
    } else {
      console.log("加载群聊列表失败或返回数据为空");
    }
  } catch (error) {
    console.log("加载会话列表异常:", error.message);
  } finally {
    loading.value = false;
  }
};

// 防抖更新定时器
let updateTimer = null;

// 会话列表更新处理函数
const handleConversationListUpdate = async (eventData) => {
  console.log("【消息列表页】会话列表更新事件:", eventData);

  // 处理单个会话更新（标记已读的情况）
  if (eventData && !Array.isArray(eventData) && eventData.conversationID) {
    const conversationID = eventData.conversationID;
    const existingIndex = conversationList.value.findIndex(
      (conv) => conv.conversationID === conversationID
    );

    if (existingIndex !== -1) {
      // 直接更新未读数，避免触发整个对象的响应式更新
      if (eventData.unreadCount !== undefined) {
        conversationList.value[existingIndex].unreadCount =
          eventData.unreadCount;
        console.log(
          `【消息列表页】已更新会话未读数: ${conversationList.value[existingIndex].name}, unreadCount: ${eventData.unreadCount}`
        );
      }
      // 更新最后消息
      if (eventData.lastMessage) {
        conversationList.value[existingIndex].lastMessage = eventData.lastMessage.messageForShow || '';
        conversationList.value[existingIndex].lastMessageTime = eventData.lastMessage.lastTime || Date.now();
        // 重新排序
        conversationList.value.sort((a, b) => b.lastMessageTime - a.lastMessageTime);
      }
    }
    return;
  }

  // eventData 是一个数组，包含所有更新的会话
  if (!eventData || !Array.isArray(eventData)) {
    console.warn("【消息列表页】会话列表更新事件数据格式错误");
    return;
  }

  // 防抖处理：避免频繁更新导致闪动
  if (updateTimer) {
    clearTimeout(updateTimer);
  }

  updateTimer = setTimeout(async () => {
    // 过滤出群聊会话
    const groupConversations = eventData.filter(
      (conv) => conv.conversationID && conv.conversationID.startsWith("GROUP")
    );

    console.log(`【消息列表页】收到 ${groupConversations.length} 个群聊会话更新`);

    // 使用 TimChatManager 的格式化方法转换为标准格式
    const formattedConversations = groupConversations.map((conv) =>
      globalTimChatManager.formatConversationData(conv)
    );

    // 合并后端群组详细信息（已包含格式化和排序）
    const mergedConversations = await mergeConversationWithGroupDetails(
      formattedConversations
    );

    if (!mergedConversations || mergedConversations.length === 0) {
      console.log("【消息列表页】合并后的会话数据为空，跳过更新");
      return;
    }

    let needSort = false;

    // 更新会话列表
    mergedConversations.forEach((conversationData) => {
      const conversationID = conversationData.conversationID;
      const existingIndex = conversationList.value.findIndex(
        (conv) => conv.conversationID === conversationID
      );

      if (existingIndex !== -1) {
        const existing = conversationList.value[existingIndex];
        // 只在关键字段变化时才更新，减少不必要的渲染
        if (
          existing.lastMessage !== conversationData.lastMessage ||
          existing.lastMessageTime !== conversationData.lastMessageTime ||
          existing.unreadCount !== conversationData.unreadCount
        ) {
          // 只更新变化的字段，保持头像稳定
          conversationList.value[existingIndex] = {
            ...conversationData,
            // 保持原有头像，避免闪动
            avatar: existing.avatar || conversationData.avatar,
            // 直接使用 TIM SDK 返回的未读数
            unreadCount: conversationData.unreadCount || 0
          };
          needSort = true;
          console.log(
            `【消息列表页】已更新会话: ${conversationData.name}, unreadCount: ${conversationList.value[existingIndex].unreadCount}`
          );
        }
      } else {
        // 添加新会话
        conversationList.value.push(conversationData);
        needSort = true;
        console.log(`【消息列表页】已添加新会话: ${conversationData.name}`);
      }
    });

    // 只在需要时才排序
    if (needSort) {
      conversationList.value.sort(
        (a, b) => b.lastMessageTime - a.lastMessageTime
      );
    }
  }, 100); // 100ms 防抖延迟
};

// 消息接收处理函数
const handleMessageReceived = (message) => {
  console.log("【消息列表页】收到新消息:", message);
  // TIM SDK 会在收到新消息时自动更新会话的未读数，并触发 onConversationListUpdated 事件
  // 因此这里不需要手动处理，只记录日志
};

// 设置会话列表监听，实时更新列表
const setupConversationListener = () => {
  if (!globalTimChatManager) return;

  console.log("【消息列表页】设置会话监听器");

  // 将回调添加到全局未读监听器的回调链中
  // 这样不会覆盖全局未读监听器，而是与之共存
  if (globalUnreadListenerManager.isInitialized) {
    // globalUnreadListenerManager.addCallback("onConversationListUpdated", handleConversationListUpdate);
    // globalUnreadListenerManager.addCallback("onMessageReceived", handleMessageReceived);
    console.log("【消息列表页】已添加回调到全局监听器回调链");
  } else {
    console.warn("【消息列表页】全局未读监听器未初始化，使用直接回调方式");
    // 如果全局监听器未初始化，直接设置回调（兼容处理）
    globalTimChatManager.setCallback("onConversationListUpdated", handleConversationListUpdate);
    globalTimChatManager.setCallback("onMessageReceived", handleMessageReceived);
  }
};

// 格式化消息时间
const formatMessageTime = (timestamp) => {
  if (!timestamp) return "";

  const now = Date.now();
  const diff = now - timestamp;
  const date = new Date(timestamp);

  // 1分钟内
  if (diff < 60 * 1000) {
    return "刚刚";
  }

  // 1小时内
  if (diff < 60 * 60 * 1000) {
    return `${Math.floor(diff / (60 * 1000))}分钟前`;
  }

  // 今天
  const today = new Date();
  if (date.toDateString() === today.toDateString()) {
    return `${String(date.getHours()).padStart(2, "0")}:${String(
      date.getMinutes()
    ).padStart(2, "0")}`;
  }

  // 昨天
  const yesterday = new Date(today);
  yesterday.setDate(yesterday.getDate() - 1);
  if (date.toDateString() === yesterday.toDateString()) {
    return "昨天";
  }

  // 今年
  if (date.getFullYear() === today.getFullYear()) {
    return `${date.getMonth() + 1}月${date.getDate()}日`;
  }

  // 其他
  return `${date.getFullYear()}年${date.getMonth() + 1}月${date.getDate()}日`;
};

// 点击会话
const handleClickConversation = async (conversation) => {
  console.log("点击会话:", conversation);

  // 立即清除本地未读数显示
  const conversationIndex = conversationList.value.findIndex(
    (conv) => conv.conversationID === conversation.conversationID
  );
  if (conversationIndex !== -1) {
    conversationList.value[conversationIndex].unreadCount = 0;
  }

  // 标记会话为已读
  if (globalTimChatManager && globalTimChatManager.tim) {
    try {
      await globalTimChatManager.tim.setMessageRead({
        conversationID: conversation.conversationID,
      });
      console.log("✓ 已标记会话为已读:", conversation.conversationID);

      // 立即刷新 tabBar 徽章
      // await globalUnreadListenerManager.refreshBadge();
    } catch (error) {
      console.error("✗ 标记会话已读失败:", error);
    }
  }

  // 跳转到聊天页面
  uni.navigateTo({
    url: `/pages/message/index?conversationID=${conversation.conversationID}&groupID=${conversation.groupID}`,
  });
};

// 加载更多
const handleLoadMore = () => {
  if (loadingMore.value || !hasMore.value) return;

  loadingMore.value = true;
  // TODO: 实现分页加载
  setTimeout(() => {
    loadingMore.value = false;
  }, 1000);
};

// 下拉刷新
const handleRefresh = async () => {
  if (!hasImCorpId.value) return; 
  refreshing.value = true;

  try {
    await loadConversationList();
  } finally {
    refreshing.value = false;
  }
};

// 页面加载
async function init() {
  try {
    // 初始化IM
    const imReady = await initIM();
    if (!imReady) {
      console.log("IM初始化失败，继续加载列表");
    }
    // 先加载初始会话列表
    await loadConversationList();
    // 再设置监听器，后续通过事件更新列表
    setupConversationListener();
  } catch (error) {
    console.log("页面初始化异常:", error.message);
  }
};

// 清理消息文本（移除换行符）
const cleanMessageText = (text) => {
  if (!text) return "";
  return text.replace(/[\r\n]+/g, " ").trim();
};

// 页面显示
onShow(async () => {
  // 页面显示时刷新 tabBar 徽章
  // if (globalUnreadListenerManager.isInitialized) {
  //   await globalUnreadListenerManager.refreshBadge();
  // }
});

// 页面隐藏
onHide(() => {
  console.log("【消息列表页】页面隐藏");

  // 清除防抖定时器
  if (updateTimer) {
    clearTimeout(updateTimer);
    updateTimer = null;
  }

  // 注意：不要清除 globalTimChatManager 的回调
  // 因为全局未读监听器需要持续工作
  // 回调链会在页面销毁时自动清理
});

watch(hasImCorpId, (n, o) => {
  if (n && !o) {
    init();
  }
}, { immediate: true })
// 页面卸载
onUnmounted(() => {
  console.log("【消息列表页】页面卸载，清理回调");

  // 清除防抖定时器
  if (updateTimer) {
    clearTimeout(updateTimer);
    updateTimer = null;
  }

  // // 从全局未读监听器的回调链中移除本页面的回调
  // if (globalUnreadListenerManager.isInitialized) {
  //   globalUnreadListenerManager.removeCallback("onConversationListUpdated", handleConversationListUpdate);
  //   globalUnreadListenerManager.removeCallback("onMessageReceived", handleMessageReceived);
  //   console.log("【消息列表页】已从回调链移除回调");
  // }
});
</script>

<style scoped lang="scss">
.message-page {
  width: 100%;
  height: 100vh;
  background-color: #f5f5f5;
  display: flex;
  flex-direction: column;
}

.message-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24rpx 32rpx;
  background-color: #fff;
  border-bottom: 1rpx solid #f0f0f0;
}

.header-title {
  font-size: 36rpx;
  font-weight: 600;
  color: #000;
}

.total-unread-badge {
  min-width: 40rpx;
  height: 40rpx;
  padding: 0 12rpx;
  background-color: #ff4d4f;
  border-radius: 20rpx;
  display: flex;
  align-items: center;
  justify-content: center;
}

.badge-text {
  font-size: 24rpx;
  color: #fff;
  font-weight: 600;
  line-height: 1;
}

.message-list {
  flex: 1;
  width: 100%;
}

.loading-container,
.empty-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 100rpx 0;
}

.loading-text {
  font-size: 28rpx;
  color: #999;
}

.empty-image {
  width: 200rpx;
  height: 200rpx;
  margin-bottom: 20rpx;
}

.empty-text {
  font-size: 28rpx;
  color: #999;
}

.message-item {
  display: flex;
  align-items: center;
  padding: 24rpx 32rpx;
  background-color: #fff;
  border-bottom: 1rpx solid #f0f0f0;

  &:active {
    background-color: #f5f5f5;
  }
}

.avatar-container {
  position: relative;
  margin-right: 24rpx;
  flex-shrink: 0;
}

.avatar {
  width: 96rpx;
  height: 96rpx;
  border-radius: 8rpx;
}

.unread-badge {
  position: absolute;
  top: -8rpx;
  right: -8rpx;
  min-width: 32rpx;
  height: 32rpx;
  padding: 0 8rpx;
  background-color: #ff4d4f;
  border-radius: 16rpx;
  display: flex;
  align-items: center;
  justify-content: center;
}

.unread-text {
  font-size: 20rpx;
  color: #fff;
  line-height: 1;
}

.content {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-width: 0;
}

.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8rpx;
}

.name {
  font-size: 32rpx;
  font-weight: 500;
  color: #333;
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.time {
  font-size: 24rpx;
  color: #999;
  margin-left: 16rpx;
  flex-shrink: 0;
}

.message-preview {
  display: flex;
  align-items: center;
  min-width: 0;
}

.preview-text {
  font-size: 26rpx;
  color: #999;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex: 1;
  min-width: 0;
}

.load-more {
  padding: 20rpx 0;
  text-align: center;
}

.load-more-text {
  font-size: 24rpx;
  color: #999;
}

.patient-info {
  font-size: 26rpx;
  color: #999;
  padding-bottom: 10rpx;
}
</style>
