<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">
          <image
            class="avatar"
            :src="conversation.avatar || '/static/default-avatar.png'"
            mode="aspectFill"
          />
          <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">{{
              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 } 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";

// 获取登录状态
const { account, openid, isIMInitialized } = 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);

// 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) {
    uni.showLoading({
      title: "连接中...",
    });

    console.log("开始调用 initIMAfterLogin");
    const success = await initIMAfterLogin();
    console.log("initIMAfterLogin 返回:", success);

    uni.hideLoading();

    if (!success) {
      console.error("initIMAfterLogin 失败");
      uni.showToast({
        title: "IM连接失败，请重试",
        icon: "none",
      });
      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");
    uni.showLoading({
      title: "重连中...",
    });
    const reconnected = await globalTimChatManager.ensureIMConnection();
    uni.hideLoading();

    if (!reconnected) {
      console.error("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) {
      throw new Error("IM管理器未初始化");
    }

    if (!globalTimChatManager.tim) {
      console.error("TIM实例不存在，尝试重新初始化");
      const imReady = await initIM();
      if (!imReady || !globalTimChatManager.tim) {
        throw new Error("TIM实例初始化失败");
      }
    }

    if (!globalTimChatManager.getGroupList) {
      throw new Error("getGroupList 方法不存在");
    }

    // 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, "个会话");
    } else {
      console.error("加载群聊列表失败:", result);
      uni.showToast({
        title: "加载失败，请重试",
        icon: "none",
      });
    }
  } catch (error) {
    console.error("加载会话列表失败:", error);
    uni.showToast({
      title: error.message || "加载失败，请重试",
      icon: "none",
    });
  } finally {
    loading.value = false;
  }
};

// 防抖更新定时器
let updateTimer = null;

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

  // 监听会话列表更新事件
  globalTimChatManager.setCallback("onConversationListUpdated", (eventData) => {
    console.log("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(
            `已清空会话未读数: ${conversationList.value[existingIndex].name}, unreadCount: ${eventData.unreadCount}`
          );
        }
      }
      return;
    }

    // eventData 是一个数组，包含所有更新的会话
    if (!eventData || !Array.isArray(eventData)) {
      console.warn("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(`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("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
          ) {
            // 使用 Object.assign 更新，保持引用稳定
            Object.assign(
              conversationList.value[existingIndex],
              conversationData
            );
            needSort = true;
            console.log(
              `已更新会话: ${conversationData.name}, unreadCount: ${conversationData.unreadCount}`
            );
          }
        } else {
          // 添加新会话
          conversationList.value.push(conversationData);
          needSort = true;
          console.log(`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
  });

  // 监听消息接收事件（用于更新未读数）
  globalTimChatManager.setCallback("onMessageReceived", (message) => {
    console.log("消息列表页面收到新消息:", message);

    // 找到对应的会话
    const conversationID = message.conversationID;
    const conversationIndex = conversationList.value.findIndex(
      (conv) => conv.conversationID === conversationID
    );

    if (conversationIndex !== -1) {
      const conversation = conversationList.value[conversationIndex];

      // 检查当前页面栈，判断用户是否正在查看该会话
      const pages = getCurrentPages();
      const currentPage = pages[pages.length - 1];
      const isViewingConversation =
        currentPage?.route === "pages/message/index";

      // 如果用户正在查看该会话，不增加未读数
      if (isViewingConversation) {
        console.log("用户正在查看该会话，不增加未读数");
        return;
      }

      // 只在用户不在聊天页面时才增加未读数
      conversation.unreadCount = (conversation.unreadCount || 0) + 1;
      console.log(
        "已更新会话未读数:",
        conversation.name,
        "unreadCount:",
        conversation.unreadCount
      );
    }
  });
};

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

  // 立即清空本地未读数（优化用户体验）
  const conversationIndex = conversationList.value.findIndex(
    (conv) => conv.conversationID === conversation.conversationID
  );
  if (conversationIndex !== -1) {
    conversationList.value[conversationIndex].unreadCount = 0;
    console.log("已清空本地未读数:", conversation.name);
  }

  // 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 () => {
  refreshing.value = true;

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

// 页面加载
onLoad(() => {
  console.log("消息列表页面加载");
});

// 页面显示
onShow(async () => {
  try {
    console.log("消息列表页面显示，开始初始化");

    // 初始化IM
    const imReady = await initIM();
    if (!imReady) initIMAfterLogin();
    // 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.error("页面初始化失败:", error);
    uni.showToast({
      title: error.message || "初始化失败，请重试",
      icon: "none",
    });
  }
});

// 页面隐藏
onHide(() => {
  // 清除防抖定时器
  if (updateTimer) {
    clearTimeout(updateTimer);
    updateTimer = null;
  }

  // 移除消息监听
  if (globalTimChatManager) {
    globalTimChatManager.setCallback("onConversationListUpdated", null);
    globalTimChatManager.setCallback("onMessageReceived", null);
  }
});
</script>

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

.message-list {
  width: 100%;
  height: 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;
}

.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;
}

.preview-text {
  font-size: 26rpx;
  // color: #999;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.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>
