import { View, ScrollView } from "@tarojs/components";
import NavBarNormal from "@/components/NavBarNormal/index";
import PageCustom from "@/components/page-custom/index";
import Taro, { useDidShow, useRouter, useUnload } from "@tarojs/taro";
import ChatMessage from "@/components/chat-message";
import InputBar from "./components/input-bar";
import { useEffect, useState, useRef, useMemo } from "react";
import { useTextChat } from "@/store/textChat";
import { formatMessageTime } from "@/utils/timeUtils";
import { formatMessageItem } from "@/utils/messageUtils";
import {
  TRobotMessage,
  TMessage,
  TAnyMessage,
} from "@/types/bot";

import ChatGreeting from "./components/ChatGreeting";
import IconArrowLeftWhite24 from "@/components/icon/IconArrowLeftWhite24";
import IconArrowLeft from "@/components/icon/icon-arrow-left";
import PersonalCard from "./components/personal-card";
import ButtonEnableStreamVoice from "./components/OptionButtons/ButtonEnableStreamVoice";
import { useAgentStore } from "@/store/agentStore";

import { useLoadMoreInfinite, createKey } from "@/utils/loadMoreInfinite";
import { getMessageHistories } from "@/service/chat";

import RecommendQuestions from "./components/RecommendQuestions";
import { useKeyboard } from "./components/keyboard";
import { useAppStore } from "@/store/appStore";
import { usePersistentState } from '@/hooks/usePersistentState';

export default function Index() {
  const router = useRouter();

  const { agentId, isVisitor } = router.params;
  if (!agentId) {
    return <View>没有相应的智能体</View>;
  }

  const { fetchAgent, fetchAgentProfile } = useAgentStore();

  const bottomSafeHeight = useAppStore( state => state.bottomSafeHeight)

  const agent = useAgentStore((state) => {
    if (isVisitor === "true") {
      return state.agentProfile;
    }
    return state.agent;
  });
  const scrollViewRef = useRef<any>(null);
  const messageList = useTextChat((state) => state.list);
  const [inputContainerHeight,setInputContainerHeight]= useState(0)
  const [streamVoiceEnable, setStreamVoiceEnable]= usePersistentState('streamVoiceEnable', false)

  const { keyboardHeight, marginTopOffset, triggerHeightUpdate } = useKeyboard(
    scrollViewRef,
    "#messageList",
    "#scrollView"
  );

  // 输入框容器
  // 针对没有 safeArea?.bottom 的手机，需要额外增加 12 高度
  let inputContainerBottomOffset = 0
  if(bottomSafeHeight <= 0){
    inputContainerBottomOffset = 12
  }

  const { destroy, setScrollTop, genSessionId, setAutoScroll } = useTextChat();
  const scrollTop = useTextChat((state) => state.scrollTop);

  // 放在组件里
const initialScrolledRef = useRef(false);

  const fetcher = async ([_url, { nextId, pageSize }]) => {
    const _nextId = nextId ? decodeURIComponent(nextId) : nextId;
    const res = await getMessageHistories({
      agentId,
      startId: _nextId,
      pageSize,
    });
    return res.data;
  };

  // 获取历史聊天记录
  const { list, loadMore, pageIndex, mutate } = useLoadMoreInfinite<
    TMessage[] | TRobotMessage[]
  >(createKey(`messeagehistories${isVisitor}${agentId}`), fetcher);

  // 解析消息体 content 
  const parsedList = list.filter((item)=> !!item.content.length).map(formatMessageItem);
  // 1. 按 sessionId 分组，并记录每组的最早时间
  const resultMap = useMemo(() => {
    const allMessages = [...[...parsedList].reverse(), ...messageList];
    return allMessages.reduce((acc, item) => {
      const { sessionId, msgTime } = item;
      if (!sessionId || !msgTime) {
        return acc;
      }
      let _msgTime = msgTime.replace(/\-/g, "/");
      if (!acc[sessionId]) {
        acc[sessionId] = {
          dt: _msgTime, // 初始化当前组的最早时间
          list: [item], // 初始化当前组的记录列表
        };
      } else {
        // 更新最早时间（如果当前记录的 msgTime 更早）
        if (new Date(_msgTime) < new Date(acc[sessionId].dt)) {
          acc[sessionId].dt = msgTime;
          console.log('yoyoyo')
        }
        // 将记录添加到当前组
        acc[sessionId].list.push(item);
      }
      return acc;
    }, {}) as {
      dt: string;
      list: TAnyMessage[];
    }[];
  }, [parsedList, messageList]);

  // 2. 转换为最终数组格式
  const result = Object.values(resultMap);

  const messagesLength = useMemo(() => result.length, [result.length]);
  const prevLengthRef = useRef(messagesLength);

  const [showWelcome, setShowWelcome] = useState(!list.length);
  const haveBg =  (!!agent?.enabledChatBg && !!agent.avatarUrl?.length)

  //  加载更多
  const onScrollToUpper = () => {
    console.log("onscroll");
    loadMore();
  };

  const handleTouchMove = () => {
    console.log("set auto scroll false");
    setAutoScroll(false);
  };
  
  useDidShow(() => {
    mutate();
  });

  useEffect(() => {
    if (agentId) {
      if (isVisitor) {
        fetchAgentProfile(agentId);
      } else {
        fetchAgent(agentId);
      }
    }
  }, [agentId, isVisitor]);

  // 是否显示欢迎 ui
  useEffect(() => {
    setShowWelcome(!messageList.length && !list.length);
  }, [list, messageList]);

  // 首次进入界面滚动到底
  // 已有：messagesLength 是一个 number（来源于 result.length）
  useEffect(() => {
  // 仅首次 pageIndex === 1 且已经有消息时滚动一次
  if (pageIndex === 1 && messagesLength > 0 && !initialScrolledRef.current) {
    initialScrolledRef.current = true;
    // 下1秒再滚，确保 DOM 已完成渲染
    setTimeout(() => setScrollTop(), 1000);
  }
}, [pageIndex, messagesLength]);

  // 首次进入聊天生成 session id
  useEffect(() => {
    genSessionId();
  }, []);

  // 监听消息列表变化，触发键盘高度重新计算
  useEffect(() => {
    // 只在长度真正变化时才触发
    if (prevLengthRef.current !== messagesLength) {
      prevLengthRef.current = messagesLength;

      // 使用 setTimeout 确保 DOM 更新完成后再计算高度
      const timer = setTimeout(() => {
        triggerHeightUpdate();
      }, 100);

      return () => clearTimeout(timer);
    }
  }, [messagesLength, triggerHeightUpdate]);

  useUnload(() => {
    destroy();
  });

  const renderNavLeft = () => {
    
    return (
      <View
        className="flex items-center gap-8"
        onClick={() => Taro.navigateBack()}
      >
        {haveBg ? <IconArrowLeftWhite24 /> : <IconArrowLeft />}
        
        <PersonalCard agent={agent} haveBg={haveBg} />
      </View>
    );
  };

  // 大背景可以是视频，也可以是图片
  const getBgContent = () => {
    if (!agent?.avatarUrl || !!!agent?.enabledChatBg) {
      return "";
    }
    return agent?.avatarUrl;
  };

  useEffect(() => {
    if(haveBg){
      Taro.setNavigationBarColor({
        frontColor: "#ffffff",
        backgroundColor: "transparent",
      });
    }
    return () => {
      Taro.setNavigationBarColor({
        frontColor: "#000000",
        backgroundColor: "transparent",
      });
    };
  }, [haveBg]);

  useEffect(()=> {
    const query = Taro.createSelectorQuery();
    // 输入框高度
    query
      .select('#inputContainer')
      .boundingClientRect((rect: any) => {
        if (rect) {
          
          // console.log('ScrollView height:', rect.height)
          setInputContainerHeight(rect.height - bottomSafeHeight);
        }
      })
      .exec();
  }, [agent])

  return (
    <PageCustom
      fullPage
      style={{ overflow: "hidden" }}
      styleBg={getBgContent()}
    >
      <NavBarNormal blur leftColumn={renderNavLeft}>
        {/* <>{`${scrollTop}`}--{autoScroll ? 'true': 'false'}</> */}
      </NavBarNormal>
      <View
        className="flex flex-col w-full h-full relative z-10 flex-1"
        style={{ top: `${marginTopOffset}px` }}
      >
        <ScrollView
          ref={scrollViewRef}
          scrollY
          id="scrollView"
          style={{
            flex: 1,
            height: "1px", // 高度自适应
          }}
          scrollTop={scrollTop}
          scrollWithAnimation
          onScrollToUpper={onScrollToUpper}
          onScrollToLower={() => setAutoScroll(true)}
        >
          <View
            id="messageList"
            className="flex flex-col gap-16 px-18"
            onTouchMove={handleTouchMove}
          >
            {showWelcome && <ChatGreeting agent={agent} />}
            {result.map((group) => {
              return (
                <>
                  <View className={`text-12 leading-20 block text-center w-full ${(agent?.enabledChatBg && !!agent?.avatarUrl?.length) ? 'text-white-70' : 'text-black-25'}`}>
                    {formatMessageTime(group.dt)}
                  </View>
                  {group.list.map((message) => {
                    const reasoningContent =
                      (message as any).reasoningContent || "";
                    return (
                      <ChatMessage
                        key={message.msgUk}
                        textReasoning={reasoningContent}
                        agent={agent}
                        role={message.role}
                        text={message.content}
                        message={message}
                      ></ChatMessage>
                    );
                  })}
                </>
              );
            })}
          </View>
          <View className="pb-40 pt-8">
            {agent && <RecommendQuestions enableOutputAudioStream={streamVoiceEnable} agent={agent} />}
          </View>
        </ScrollView>
        <View className="w-full h-60" style={{
          height: inputContainerHeight,
        }}>
        </View>
        <View
          className="bottom-bar px-16 pt-12 z-50"
          id="inputContainer"
          style={{
            bottom: `${keyboardHeight + inputContainerBottomOffset}px`,
          }}
        >
          <View className="bg-[#F5FAFF]">
            {agent &&
              <View className="flex flex-col w-full gap-8">
                <InputBar
                  enableOutputAudioStream={streamVoiceEnable}
                  agent={agent}
                  histories={list}
                  setShowWelcome={setShowWelcome}
                ></InputBar>
                <View>
                  <ButtonEnableStreamVoice setEnable={setStreamVoiceEnable} enable={streamVoiceEnable}></ButtonEnableStreamVoice>
                </View>
              </View>
            }
          </View>
        </View>
      </View>
    </PageCustom>
  );
}