import { View, ScrollView, Video } 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 { TRobotMessage, TMessage, EContentType, EChatRole } from "@/types/bot";

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

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


import RecommendQuestions from './components/RecommendQuestions'
import {useKeyboard} from './components/keyboard'
import { saveMessageToServer } from "./components/input-bar/message";
import { generateUUID, getLoginId } from '@/utils/index'


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 agent = useAgentStore((state) => {
    if(isVisitor === 'true'){
      return state.agentProfile
    }
    return state.agent
  });
  const scrollViewRef = useRef<any>(null);
  const messageList = useTextChat((state) => state.list);
  
  const {keyboardHeight, marginTopOffset, triggerHeightUpdate,} = useKeyboard(scrollViewRef, '#messageList', '#scrollView')
  

  

  
  const { destroy, setScrollTop, genSessionId, sessionId, setAutoScroll } = useTextChat();
  const scrollTop = useTextChat((state) => state.scrollTop);
  // const autoScroll = useTextChat((state) => state.autoScroll);
  
  const fetcher = async ([_url,{ nextId, pageSize}]) => {
    const _nextId = nextId ? decodeURIComponent(nextId) : nextId;
    const res = await getMessageHistories({
      agentId,
      startId: _nextId,
      pageSize,
    });
    return res.data;
  };
  const { list, loadMore, pageIndex, mutate } = useLoadMoreInfinite<TMessage[]|TRobotMessage[]>(
    createKey(`messeagehistories${isVisitor}${agentId}`),
    fetcher,
  );

  const parsedList = list.map((item: TMessage|TRobotMessage) => {
    if(item.contentType == EContentType.AiseekQA){
      try{
        const contentJson = JSON.parse(item.content as string)
        item.content = contentJson.answer.text
        // 把消息详情放入统一 body 中
        item.body = {...item, content: contentJson, contentType: EContentType.AiseekQA}
      }catch(e){
        // console.error(e)
      }
    }
    return item
  })
  const allMessages = useMemo(()=> [...[...parsedList].reverse(), ...messageList], [parsedList, messageList])
  const messagesLength = useMemo(() => allMessages.length, [allMessages.length]);
  const prevLengthRef = useRef(messagesLength);

  const [showWelcome, setShowWelcome] = useState(!list.length);

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

  const handleTouchMove = ()=> {
    console.log('set auto scroll false')
    setAutoScroll(false)
  }


  useDidShow(()=> {
    mutate(undefined,{revalidate: true})
  })

  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]);


  // 将 greeting 开场白存入聊天记录里
  // useEffect(()=> {
  //   console.log(showWelcome, agent)
  //   if(!showWelcome){
  //     return;
  //   }
  //   const loginId = getLoginId();
  //   if (!loginId || !agent?.agentId || !agent?.greeting || !sessionId) {
  //     return;
  //   }
  //   saveMessageToServer({
  //     loginId,
  //     messages: [{
  //       content: agent.greeting,
  //       contentType: EContentType.TextPlain,
  //       role: EChatRole.Assistant,
  //       saveStatus: 2,
  //       isStreaming: false,
  //       msgUk: generateUUID(),
  //     }],
  //     agentId: agent.agentId,
  //     sessionId,
  //   })
  // }, [showWelcome, sessionId])

  // 首次进入界面滚动到底
  useEffect(() => {
    if (pageIndex === 1) {
      setTimeout(() => {
        setScrollTop();
      }, 300);
    }
  }, [pageIndex]);

  // 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()}
      >
        <IconArrowLeftWhite24 />
        <PersonalCard agent={agent} size="mini" />
      </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(()=> {
    Taro.setNavigationBarColor({
      frontColor: '#ffffff',
      backgroundColor: 'transparent'
    })
    return ()=> {
      Taro.setNavigationBarColor({
        frontColor: '#000000',
        backgroundColor: 'transparent'
      })
    }
  })
  


  
  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} />}
            {/* 复制 histories 再 reverse 否则会影响 state */}
            {allMessages.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 agent={agent} />}
          </View>
        </ScrollView>
        <View className="w-full h-54">
          {/* 输入框高度占位块，todo: 改成动态获取输入框块高度 */}
        </View>
        <View
          className="bottom-bar px-16 pt-12 z-50"
          style={{
            bottom: `${keyboardHeight}px`,
          }}

        >
          <View className="bg-[#F5FAFF]">
          {agent && (
              <InputBar
                agent={agent}
                histories={list}
                setShowWelcome={setShowWelcome}
              ></InputBar>
          )}
          </View>
        </View>
      </View>
    </PageCustom>
  );
}