import { View, ScrollView } from "@tarojs/components";
import NavBarNormal from "@/components/NavBarNormal/index";
import PageCustom from "@/components/page-custom/index";
import Taro, { useRouter, useUnload } from "@tarojs/taro";
import ChatMessage from "@/components/chat-message";
import style from "./index.module.less";
import InputBar from "./components/input-bar";
import { useEffect, useState, useRef } from "react";
import { useTextChat } from "@/store/textChat";
import { EAI_MODEL } from "@/consts/enum";
import type { TMessage, TRobotMessage } from "@/store/textChat";

import ChatWelcome from "./components/chat-welcome";
import IconArrowLeft from "@/components/icon/icon-arrow-left";
import PersonalCard from "./components/personal-card";
import { useAgentStore } from "@/store/agentStore";

import { useLoadMore } from "@/utils/loadMore";
import { getMessageHistories } from "@/service/bot";
import { useAppStore } from "@/store/appStore";

// 类型谓词函数
function isRobotMessage(
  message: TMessage | TRobotMessage
): message is TRobotMessage {
  return "robot" in message && "reasoningContent" in message;
}

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 headerHeight = useAppStore((state) => state.headerHeight);
  const { fetchAgent, fetchAgentProfile, } = useAgentStore();
  const agent = useAgentStore((state) => {
    if(isVisitor === 'true'){
      return state.agentProfile
    }
    return state.agent
  });

  const [deepThink, setDeepThink] = useState(EAI_MODEL.DeepseekChat);

  const [histories, setHistories] = useState<(TMessage | TRobotMessage)[]>([]);

  const [keyboardHeight, setKeyboardHeight] = useState(0);
  const [contentHeight, setContentHeight] = useState(0);
  const [scrollViewHeight, setScrollViewHeight] = useState(0);

  const scrollViewRef = useRef<any>(null);

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

  const fetcher = async ([_url, nextId, page, pageSize]) => {
    if (!agent) {
      return null;
    }
    const _nextId = nextId ? decodeURIComponent(nextId) : nextId;
    const res = await getMessageHistories({
      agentId,
      startId: _nextId,
      pageSize,
    });
    return res.data;
  };
  const { data, loadMore, page } = useLoadMore<(TMessage | TRobotMessage)[]>({
    url: `messeagehistories${isVisitor}${agentId}`,
    fetcher,
  });

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

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

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

  useEffect(() => {
    setShowWelcome(!histories.length);
  }, [histories]);

  useEffect(() => {
    if (data?.data) {
      const combine = [...histories, ...data.data]
      setHistories(combine);
      if (page === 1) {
        setTimeout(() => {
          setScrollTop();
        }, 300);
      }
    }
  }, [data, page,]);

  // 计算 marginTopOffset 偏移的距离
  const marginTopOffset = (() => {
    if (keyboardHeight <= 0) return 0;
    // 如果内容超过滚动容器，取键盘弹起高度
    if (contentHeight > scrollViewHeight) {
      return -keyboardHeight;
    }
    // 如果内容+键盘弹起高度超过滚动容器, 则取其差值
    if (contentHeight + keyboardHeight > scrollViewHeight) {
      // 内容+键盘弹起高度 - 滚动容器高度
      return -(contentHeight + keyboardHeight - scrollViewHeight);
    }
  })();

  useEffect(() => {
    // 监听键盘高度变化
    Taro.onKeyboardHeightChange((res) => {
      if (res.height <= 0) {
        return setKeyboardHeight(0);
      }

      setKeyboardHeight(res.height - 24);
    });

    return () => {
      // 清理监听器
      Taro.offKeyboardHeightChange();
    };
  }, []);

  // 监听内容高度和 ScrollView 高度变化
  useEffect(() => {
    if (scrollViewRef.current) {
      const query = Taro.createSelectorQuery();
      // 获取聊天内容高度
      query
        .select("#message-list")
        .boundingClientRect((rect: any) => {
          if (rect) {
            setContentHeight(rect.height);
          }
        })
        .exec();
      // 获取滚动容器高度
      query
        .select("#scroll-view")
        .boundingClientRect((rect: any) => {
          if (rect) {
            setScrollViewHeight(rect.height);
          }
        })
        .exec();
    }
  }, [messageList]);

  useEffect(() => {
    genSessionId();
  }, []);

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

  const switchDeepThink = () => {
    if (deepThink === EAI_MODEL.DeepseekChat) {
      setDeepThink(EAI_MODEL.DeepseekReasoner);
      return;
    }
    setDeepThink(EAI_MODEL.DeepseekChat);
  };

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

  // 自定义背景样式
  const bgImageStyle = {
    backgroundImage: `url(${agent?.avatarUrl})`,
  };

  return (
    <PageCustom fullPage style={{ overflow: "hidden" }}>
      <NavBarNormal leftColumn={renderNavLeft}></NavBarNormal>
      {(!!agent?.enabledChatBg) ? <View className={style.topBg} style={bgImageStyle}></View> : <></>}
      <View
        className="flex flex-col w-full h-screen relative z-10"
        style={{ marginTop: `${marginTopOffset}px` }}
      >
        <ScrollView
          ref={scrollViewRef}
          scrollY
          id="scrollView"
          style={{
            flex: 1,
            height: "1px", // 高度自适应
          }}
          scrollTop={scrollTop}
          scrollWithAnimation
          onScrollToUpper={onScrollToUpper}
        >
          {showWelcome && <ChatWelcome agent={agent} />}
          <View id="messageList" className="flex flex-col gap-8 px-18 pb-140">
            {/* 复制 histories 再 reverse 否则会影响 state */}
            {[...[...histories].reverse(), ...messageList].map((message) => {
              const robotMessage = isRobotMessage(message) ? message : null;
              return (
                <ChatMessage
                  key={message.msgUk}
                  textReasoning={robotMessage?.reasoningContent}
                  agent={agent}
                  role={message.role}
                  text={message.content}
                  message={message}
                ></ChatMessage>
              );
            })}
          </View>
        </ScrollView>
        <View className="h-140 w-10"></View>
        <View
          className="fixed left-0 right-0 bottom-0 min-h-130 z-50"
          style={{
            bottom: `${keyboardHeight}px`,
          }}
        >
          {/* <View
            onClick={switchDeepThink}
            className={
              deepThink === EAI_MODEL.DeepseekReasoner
                ? style.deepMindMarkActive
                : style.deepMindMark
            }
          >
            深度思考(R1)
          </View> */}
          {agent && (
            <InputBar
              aiModel={deepThink}
              agent={agent}
              histories={histories}
              setShowWelcome={setShowWelcome}
            ></InputBar>
          )}
        </View>
      </View>
    </PageCustom>
  );
}