<template>
  <view class="chat-page">
    <!-- 聊天消息区域 -->
    <scroll-view
      class="chat-content"
      scroll-y="true"
      enhanced="true"
      bounces="false"
      :scroll-into-view="scrollIntoView"
      @scroll="onScroll"
      @scrolltoupper="handleScrollToUpper"
      ref="chatScrollView"
    >
      <!-- 加载更多提示 -->
      <view class="load-more-tip" v-if="messageList.length >= 15">
        <view class="loading" v-if="isLoadingMore">
          <text class="loading-text">加载中...</text>
        </view>
        <view class="load-tip" v-else-if="!isCompleted">
          <text class="tip-text">↑ 上滑加载更多</text>
        </view>
        <view class="load-tip" v-else>
          <text class="completed-text">已加载全部消息</text>
        </view>
      </view>

      <!-- 聊天消息列表 -->
      <view class="message-list" @click="closeMorePanel">
        <view
          v-for="(message, index) in messageList"
          :key="message.ID"
          :id="`msg-${message.ID}`"
          class="message-item"
          :class="{
            'message-right': message.flow === 'out',
            'message-left': message.flow === 'in',
          }"
        >
          <!-- 时间分割线 -->
          <view
            v-if="shouldShowTime(message, index, messageList)"
            class="time-divider"
          >
            <text class="time-text">{{ formatTime(message.lastTime) }}</text>
          </view>

          <view v-if="isSystemMessage(message)">
            <SystemMessage :message="message" />
          </view>

          <!-- 消息内容 -->
          <view v-else class="message-content">
            <!-- 医生头像（左侧） -->
            <image
              v-if="message.flow === 'in'"
              class="doctor-msg-avatar"
              :src="chatMember[message.from]?.avatar || '/static/default-avatar.png'"
              mode="aspectFill"
            />

            <!-- 患者头像（右侧） -->
            <image
              v-if="message.flow === 'out'"
              class="user-msg-avatar"
              :src="chatMember[message.from]?.avatar || '/static/home/avatar.svg'"
              mode="aspectFill"
            />

            <!-- 消息内容区域 -->
            <view class="message-bubble-container">
              <!-- 用户名显示 -->
              <view
                class="username-label"
                :class="{
                  left: message.flow === 'in',
                  right: message.flow === 'out',
                }"
              >
                <text class="username-text">{{
                  chatMember[message.from]?.name
                }}</text>
              </view>

              <!-- 消息气泡 -->
              <view class="message-bubble" :class="getBubbleClass(message)">
                <!-- 消息内容 -->
                <MessageTypes
                  :message="message"
                  :formatTime="formatTime"
                  :playingVoiceId="playingVoiceId"
                  @playVoice="playVoice"
                  @previewImage="previewImage"
                  @viewDetail="(message) => handleViewDetail(message)"
                />
              </view>
            </view>

            <!-- 发送状态 -->
            <view v-if="message.flow === 'out'" class="message-status">
              <text
                v-if="message.status === 'failed'"
                class="status-text failed"
                >发送失败</text
              >
            </view>
          </view>
        </view>
      </view>
    </scroll-view>

    <!-- 聊天输入组件 -->
    <ChatInput
      v-if="!isEvaluationPopupOpen"
      :timChatManager="timChatManager"
      :formatTime="formatTime"
      @scrollToBottom="() => scrollToBottom(true)"
      @messageSent="() => scrollToBottom(true)"
    />
  </view>
</template>

<script setup>
import { ref, onUnmounted, nextTick, watch, computed } 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 {
  startIMMonitoring,
  stopIMMonitoring,
} from "@/utils/im-status-manager.js";
import {
  getVoiceUrl,
  validateVoiceUrl,
  createAudioContext,
  showMessage,
  formatTime,
  shouldShowTime,
  previewImage,
  throttle,
  clearMessageCache,
  handleViewDetail,
  checkIMConnectionStatus,
} from "@/utils/chat-utils.js";
import useGroupChat from "./hooks/use-group-chat";
import MessageTypes from "./components/message-types.vue";
import ChatInput from "./components/chat-input.vue";
import SystemMessage from "./components/system-message.vue";

const timChatManager = globalTimChatManager;

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

const groupId = ref("");
const {
  chatMember,
  getGroupInfo
} = useGroupChat(groupId);

// 动态设置导航栏标题
const updateNavigationTitle = () => {
  uni.setNavigationBarTitle({
    title: "群聊"
  });
};

// 聊天信息
const chatInfo = ref({
  conversationID: "",
  userID: "",
  avatar: "/static/home/avatar.svg",
});

// 评价弹窗状态
const isEvaluationPopupOpen = ref(false);

// 消息列表相关状态
const messageList = ref([]);
const isLoading = ref(false);
const scrollIntoView = ref("");

// 分页加载相关状态
const isLoadingMore = ref(false);
const isCompleted = ref(false);
const lastFirstMessageId = ref("");

// 判断是否为系统消息
function isSystemMessage(message) {
  const description = message.payload?.description;
  return (
    message.type === "TIMCustomElem" && description === "SYSTEM_NOTIFICATION"
  );
}

// 获取消息气泡样式类
function getBubbleClass(message) {
  // 图片消息不需要气泡背景
  if (message.type === "TIMImageElem") {
    return "image-bubble";
  }
  
  if (message.type === "TIMCustomElem") {
    return message.flow === "out" ? "user-bubble" : "doctor-bubble-blue";
  }
  return message.flow === "out" ? "user-bubble" : "doctor-bubble";
}

// 页面加载
onLoad((options) => {
  groupId.value = options.groupID || "";
  messageList.value = [];
  isLoading.value = false;
  if (options.conversationID) {
    chatInfo.value.conversationID = options.conversationID;
    timChatManager.setConversationID(options.conversationID);
    console.log("设置当前会话ID:", options.conversationID);
  }
  if (options.userID) {
    chatInfo.value.userID = options.userID;
  }
  checkLoginAndInitTIM();
  updateNavigationTitle();
});

// 检查登录状态并初始化IM
const checkLoginAndInitTIM = async () => {
  if (!isIMInitialized.value) {
    uni.showLoading({
      title: "连接中...",
    });
    const success = await initIMAfterLogin(openid.value);
    uni.hideLoading();
    if (!success) {
      uni.showToast({
        title: "IM连接失败，请重试",
        icon: "none",
      });
      return;
    }
  } else if (!timChatManager.isLoggedIn) {
    uni.showLoading({
      title: "重连中...",
    });
    const reconnected = await timChatManager.ensureIMConnection();
    uni.hideLoading();
    if (!reconnected) {
      return;
    }
  }
  initTIMCallbacks();
};

// 初始化IM回调函数
const initTIMCallbacks = async () => {
  timChatManager.setCallback("onSDKReady", () => {
    if (messageList.value.length === 0 && !isLoading.value) {
      loadMessageList();
    }
  });

  timChatManager.setCallback("onSDKNotReady", () => {});

  timChatManager.setCallback("onMessageReceived", (message) => {
    console.log("页面收到消息:", {
      messageID: message.ID,
      conversationID: message.conversationID,
      currentConversationID: chatInfo.value.conversationID,
      type: message.type,
      flow: message.flow,
    });

    // 验证消息属于当前群聊
    if (message.conversationID !== chatInfo.value.conversationID) {
      console.log("⚠️ 消息不属于当前群聊，已过滤");
      return;
    }

    // 检查消息是否已存在
    const existingMessage = messageList.value.find(
      (msg) => msg.ID === message.ID
    );
    if (!existingMessage) {
      messageList.value.push(message);
      console.log("✓ 添加消息到列表，当前消息数量:", messageList.value.length);
      // 立即滚动到底部，不使用延迟
      nextTick(() => {
        scrollToBottom(true);
      });
    }
  });

  timChatManager.setCallback("onMessageSent", (data) => {
    const { messageID, status } = data;
    const message = messageList.value.find((msg) => msg.ID === messageID);
    if (message) {
      message.status = status;
      console.log("更新消息状态:", messageID, status);
    }
  });

  timChatManager.setCallback("onMessageListLoaded", (data) => {
    console.log("【onMessageListLoaded】收到消息列表回调");
    uni.hideLoading();

    let messages = [];
    if (typeof data === "object" && data.messages) {
      messages = data.messages;
    } else {
      messages = data;
    }
    isLoading.value = false;

    // 去重处理 + 严格过滤当前群聊的消息
    const uniqueMessages = [];
    const seenIds = new Set();

    messages.forEach((message) => {
      const belongsToCurrentConversation =
        message.conversationID === chatInfo.value.conversationID;

      if (
        message.ID &&
        !seenIds.has(message.ID) &&
        belongsToCurrentConversation
      ) {
        seenIds.add(message.ID);
        uniqueMessages.push(message);
      }
    });

    messageList.value = uniqueMessages;
    console.log(
      "消息列表已更新，原始",
      messages.length,
      "条，过滤后",
      uniqueMessages.length,
      "条消息"
    );

    isCompleted.value = data.isCompleted || false;
    isLoadingMore.value = false;

    nextTick(() => {
      if (data.isRefresh) {
        console.log("后台刷新完成，保持当前滚动位置");
        return;
      }

      if (data.isPullUp && lastFirstMessageId.value) {
        console.log(
          "上拉加载完成，定位到加载前的第一条消息:",
          lastFirstMessageId.value
        );
        setTimeout(() => {
          scrollIntoView.value = `msg-${lastFirstMessageId.value}`;
          lastFirstMessageId.value = "";
        }, 100);
        return;
      }

      if (!data.isPullUp) {
        setTimeout(() => {
          scrollToBottom();
          setTimeout(() => {
            scrollToBottom();
          }, 100);
        }, 200);
      }
    });
  });

  timChatManager.setCallback("onError", (error) => {
    console.error("TIM错误:", error);
    uni.showToast({
      title: error,
      icon: "none",
    });
  });

  nextTick(() => {
    if (timChatManager.tim && timChatManager.isLoggedIn) {
      setTimeout(() => {
        loadMessageList();
      }, 50);
    } else if (timChatManager.tim) {
      let checkCount = 0;
      const checkInterval = setInterval(() => {
        checkCount++;
        if (timChatManager.isLoggedIn) {
          clearInterval(checkInterval);
          loadMessageList();
        } else if (checkCount > 10) {
          clearInterval(checkInterval);
          showMessage("IM登录超时，请重新进入");
        }
      }, 1000);
    }
  });
};

// 加载消息列表
const loadMessageList = () => {
  if (isLoading.value) {
    console.log("正在加载中，跳过重复加载");
    return;
  }

  console.log(
    "【loadMessageList】开始加载消息，会话ID:",
    chatInfo.value.conversationID
  );
  isLoading.value = true;

  uni.showLoading({
    title: "加载中...",
    mask: false,
  });

  timChatManager.enterConversation(chatInfo.value.conversationID || "test1");

  // 标记会话为已读
  if (
    timChatManager.tim &&
    timChatManager.isLoggedIn &&
    chatInfo.value.conversationID
  ) {
    timChatManager.tim
      .setMessageRead({
        conversationID: chatInfo.value.conversationID,
      })
      .then(() => {
        console.log("会话已标记为已读:", chatInfo.value.conversationID);
      })
      .catch((error) => {
        console.error("标记会话已读失败:", error);
      });
  }
};

// 语音播放相关
let currentAudioContext = null;
const playingVoiceId = ref(null);

// 播放语音
const playVoice = (message) => {
  if (playingVoiceId.value === message.ID && currentAudioContext) {
    currentAudioContext.stop();
    currentAudioContext.destroy();
    currentAudioContext = null;
    playingVoiceId.value = null;
    return;
  }

  if (currentAudioContext) {
    currentAudioContext.stop();
    currentAudioContext.destroy();
    currentAudioContext = null;
  }

  const voiceUrl = getVoiceUrl(message);
  if (!validateVoiceUrl(voiceUrl)) return;

  playingVoiceId.value = message.ID;

  currentAudioContext = createAudioContext(voiceUrl);
  currentAudioContext.onEnded(() => {
    currentAudioContext = null;
    playingVoiceId.value = null;
  });
  currentAudioContext.onError(() => {
    currentAudioContext = null;
    playingVoiceId.value = null;
  });
  currentAudioContext.play();
};

// 滚动到底部
const scrollToBottom = (immediate = false) => {
  if (messageList.value.length > 0) {
    const lastMessage = messageList.value[messageList.value.length - 1];
    const targetId = `msg-${lastMessage.ID}`;
    
    if (immediate) {
      // 立即滚动：先清空再设置，触发滚动
      scrollIntoView.value = '';
      nextTick(() => {
        scrollIntoView.value = targetId;
      });
    } else {
      // 正常滚动，使用短延迟确保DOM更新
      scrollIntoView.value = '';
      setTimeout(() => {
        scrollIntoView.value = targetId;
      }, 50);
    }
  }
};

// 关闭功能栏
const closeMorePanel = () => {
  uni.$emit("closeMorePanel");
};

// 滚动事件
const onScroll = throttle((e) => {
  // 滚动处理
}, 100);

// 处理上滑加载更多
const handleScrollToUpper = async () => {
  console.log("【handleScrollToUpper】触发上滑事件，准备加载更多");
  console.log(
    "  当前状态: isLoadingMore=",
    isLoadingMore.value,
    "isCompleted=",
    isCompleted.value
  );

  if (isLoadingMore.value || isCompleted.value) {
    console.log(
      "  ⏭️ 跳过加载：isLoadingMore=",
      isLoadingMore.value,
      "isCompleted=",
      isCompleted.value
    );
    return;
  }

  if (messageList.value.length < 15) {
    console.log("  ⏭️ 消息数量不足15条，跳过加载更多");
    return;
  }

  if (messageList.value.length > 0) {
    lastFirstMessageId.value = messageList.value[0].ID;
    console.log("  📍 记录当前第一条消息ID:", lastFirstMessageId.value);
  }

  isLoadingMore.value = true;

  try {
    console.log("  📡 调用 timChatManager.loadMoreMessages()");
    const result = await timChatManager.loadMoreMessages();

    console.log("  📥 加载结果:", result);

    if (result.success) {
      console.log(`  ✅ 加载更多成功，新增 ${result.count} 条消息`);
    } else {
      console.log("  ⚠️ 加载失败:", result.message || result.error);
      if (result.message === "已加载全部消息") {
        console.log("  ✅ 已加载全部消息");
        isCompleted.value = true;
      }
    }
  } catch (error) {
    console.error("  ❌ 加载更多失败:", error);
    uni.showToast({
      title: "加载失败，请重试",
      icon: "none",
    });
  } finally {
    isLoadingMore.value = false;
    console.log("  🏁 加载完成，isLoadingMore 设置为 false");
  }
};

// 页面显示
onShow(() => {
  if (!account.value || !openid.value) {
    uni.redirectTo({
      url: "/pages-center/login/login",
    });
    return;
  }

  if (!isIMInitialized.value) {
    checkLoginAndInitTIM();
  } else if (timChatManager.tim && !timChatManager.isLoggedIn) {
    timChatManager.ensureIMConnection();
  }

  startIMMonitoring(30000);
});

// 页面隐藏
onHide(() => {
  stopIMMonitoring();
});

// 页面卸载
onUnmounted(() => {
  clearMessageCache();

  timChatManager.setCallback("onSDKReady", null);
  timChatManager.setCallback("onSDKNotReady", null);
  timChatManager.setCallback("onMessageReceived", null);
  timChatManager.setCallback("onMessageListLoaded", null);
  timChatManager.setCallback("onError", null);
});
</script>

<style scoped lang="scss">
@import "./chat.scss";
</style>
