chat-client-web/app/components/DeepSeekChat.tsx

import { useDebouncedCallback } from "use-debounce";
import React, {
  useState,
  useRef,
  useEffect,
  useMemo,
  useCallback,
  Fragment,
  RefObject,
} from "react";
import LeftIcon from "../icons/left.svg";
import SendWhiteIcon from "../icons/send-white.svg";
import BrainIcon from "../icons/brain.svg";
import CopyIcon from "../icons/copy.svg";
import LoadingIcon from "../icons/three-dots.svg";
import ResetIcon from "../icons/reload.svg";
import DeleteIcon from "../icons/clear.svg";
import ConfirmIcon from "../icons/confirm.svg";
import CancelIcon from "../icons/cancel.svg";
import SizeIcon from "../icons/size.svg";
import avatar from "../icons/aiIcon.png";
import sdsk from "../icons/sdsk.png";
import sdsk_selected from "../icons/sdsk_selected.png";
import hlw from "../icons/hlw.png";
import { Avatar } from "./emoji";
import { MaskAvatar } from "./mask";

import {
  SubmitKey,
  useChatStore,
  useAccessStore,
  Theme,
  useAppConfig,
  DEFAULT_TOPIC,
  ModelType,
} from "../store";

import {
  copyToClipboard,
  selectOrCopy,
  autoGrowTextArea,
  useMobileScreen,
  getMessageTextContent,
  getMessageImages,
  isVisionModel,
  isDalle3,
} from "../utils";

import { uploadImage as uploadImageRemote } from "@/app/utils/chat";

import dynamic from "next/dynamic";

import { ChatControllerPool } from "../client/controller";
import { DalleSize } from "../typing";
import type { RequestMessage } from "../client/api";
import { Prompt, usePromptStore } from "../store/prompt";
import { useGlobalStore } from "../store";
import Locale from "../locales";

import { IconButton } from "./button";
import styles from "./chat.module.scss";

import {
  List,
  ListItem,
  Modal,
  Selector,
  showConfirm,
  showToast,
} from "./ui-lib";
import { useNavigate, useLocation } from "react-router-dom";
import {
  CHAT_PAGE_SIZE,
  LAST_INPUT_KEY,
  Path,
  REQUEST_TIMEOUT_MS,
  UNFINISHED_INPUT,
  ServiceProvider,
  Plugin,
} from "../constant";
import { ContextPrompts, MaskConfig } from "./mask";
import { useMaskStore } from "../store/mask";
import { ChatCommandPrefix, useChatCommand, useCommand } from "../command";
import { prettyObject } from "../utils/format";
import { ExportMessageModal } from "./exporter";
import { getClientConfig } from "../config/client";
import { useAllModels } from "../utils/hooks";
import { nanoid } from "nanoid";
import { message, Upload, UploadProps, Tooltip } from "antd";
import {
  PaperClipOutlined,
  SendOutlined,
  FileOutlined,
  FilePdfOutlined,
  FileTextOutlined,
  FileWordOutlined
} from '@ant-design/icons';

export function createMessage(override: Partial<ChatMessage>): ChatMessage {
  return {
    id: nanoid(),
    date: new Date().toLocaleString(),
    role: "user",
    content: "",
    ...override,
  };
}

export type ChatMessage = RequestMessage & {
  date: string;
  streaming?: boolean;
  isError?: boolean;
  id: string;
  model?: ModelType;
};

export const BOT_HELLO: ChatMessage = createMessage({
  role: "assistant",
  content: '您好，我是小智',
});

const Markdown = dynamic(async () => (await import("./markdown")).Markdown, {
  loading: () => <LoadingIcon />,
});

export function SessionConfigModel(props: { onClose: () => void }) {
  const chatStore = useChatStore();
  const session = chatStore.currentSession();
  const maskStore = useMaskStore();
  const navigate = useNavigate();

  return (
    <div className="modal-mask">
      <Modal
        title={Locale.Context.Edit}
        onClose={() => props.onClose()}
        actions={[
          <IconButton
            key="reset"
            icon={<ResetIcon />}
            bordered
            text={Locale.Chat.Config.Reset}
            onClick={async () => {
              if (await showConfirm(Locale.Memory.ResetConfirm)) {
                chatStore.updateCurrentSession(
                  (session) => (session.memoryPrompt = ""),
                );
              }
            }}
          />,
          <IconButton
            key="copy"
            icon={<CopyIcon />}
            bordered
            text={Locale.Chat.Config.SaveAs}
            onClick={() => {
              navigate(Path.Masks);
              setTimeout(() => {
                maskStore.create(session.mask);
              }, 500);
            }}
          />,
        ]}
      >
        <MaskConfig
          mask={session.mask}
          updateMask={(updater) => {
            const mask = { ...session.mask };
            updater(mask);
            chatStore.updateCurrentSession((session) => (session.mask = mask));
          }}
          shouldSyncFromGlobal
          extraListItems={
            session.mask.modelConfig.sendMemory ? (
              <ListItem
                className="copyable"
                title={`${Locale.Memory.Title} (${session.lastSummarizeIndex} of ${session.messages.length})`}
                subTitle={session.memoryPrompt || Locale.Memory.EmptyContent}
              ></ListItem>
            ) : (
              <></>
            )
          }
        ></MaskConfig>
      </Modal>
    </div>
  );
}

// 提示词
const CallWord = (props: {
  setUserInput: (value: string) => void,
  doSubmit: (userInput: string) => void,
}) => {
  const { setUserInput, doSubmit } = props
  const list = [
    {
      title: '信息公布',
      // text: '在哪里查看招聘信息？',
      text: '今年上海建科工程咨询的校园招聘什么时候开始？如何查阅相关招聘信息？',
    },
    {
      title: '招聘岗位',
      // text: '今年招聘的岗位有哪些？',
      text: '今年招聘的岗位有哪些？',
    },
    {
      title: '专业要求',
      // text: '招聘的岗位有什么专业要求？',
      text: '招聘的岗位有什么专业要求？',
    },
    {
      title: '工作地点',
      // text: '全国都有工作地点吗？',
      text: '工作地点是如何确定的？',
    },
    {
      title: '薪资待遇',
      // text: '企业可提供的薪资与福利待遇如何？',
      text: '企业可提供的薪资与福利待遇如何？',
    },
    {
      title: '职业发展',
      // text: '我应聘贵单位，你们能提供怎样的职业发展规划？',
      text: '公司有哪些职业发展通道？',
    },
    {
      title: '落户政策',
      // text: '公司是否能协助我落户？',
      text: '关于落户支持？',
    }
  ]

  return (
    <>
      {
        list.map((item, index) => {
          return <span
            key={index}
            style={{
              padding: '5px 10px',
              background: '#f6f7f8',
              color: '#5e5e66',
              borderRadius: 4,
              margin: '0 5px 10px 0',
              cursor: 'pointer',
              fontSize: 12
            }}
            onClick={() => {
              const plan: string = '2';
              if (plan === '1') {
                // 方案1.点击后出现在输入框内，用户自己点击发送
                setUserInput(item.text);
              } else {
                // 方案2.点击后直接发送
                doSubmit(item.text)
              }
            }}
          >
            {item.title}
          </span>
        })
      }
    </>
  )
}

function PromptToast(props: {
  showToast?: boolean;
  showModal?: boolean;
  setShowModal: (_: boolean) => void;
}) {
  const chatStore = useChatStore();
  const session = chatStore.currentSession();
  const context = session.mask.context;

  return (
    <div className={styles["prompt-toast"]} key="prompt-toast">
      {props.showToast && (
        <div
          className={styles["prompt-toast-inner"] + " clickable"}
          role="button"
          onClick={() => props.setShowModal(true)}
        >
          <BrainIcon />
          <span className={styles["prompt-toast-content"]}>
            {Locale.Context.Toast(context.length)}
          </span>
        </div>
      )}
      {props.showModal && (
        <SessionConfigModel onClose={() => props.setShowModal(false)} />
      )}
    </div>
  );
}

function useSubmitHandler() {
  const config = useAppConfig();
  const submitKey = config.submitKey;
  const isComposing = useRef(false);

  useEffect(() => {
    const onCompositionStart = () => {
      isComposing.current = true;
    };
    const onCompositionEnd = () => {
      isComposing.current = false;
    };

    window.addEventListener("compositionstart", onCompositionStart);
    window.addEventListener("compositionend", onCompositionEnd);

    return () => {
      window.removeEventListener("compositionstart", onCompositionStart);
      window.removeEventListener("compositionend", onCompositionEnd);
    };
  }, []);

  const shouldSubmit = (e: React.KeyboardEvent<HTMLTextAreaElement>) => {
    // Fix Chinese input method "Enter" on Safari
    if (e.keyCode == 229) return false;
    if (e.key !== "Enter") return false;
    if (e.key === "Enter" && (e.nativeEvent.isComposing || isComposing.current))
      return false;
    return (
      (config.submitKey === SubmitKey.AltEnter && e.altKey) ||
      (config.submitKey === SubmitKey.CtrlEnter && e.ctrlKey) ||
      (config.submitKey === SubmitKey.ShiftEnter && e.shiftKey) ||
      (config.submitKey === SubmitKey.MetaEnter && e.metaKey) ||
      (config.submitKey === SubmitKey.Enter &&
        !e.altKey &&
        !e.ctrlKey &&
        !e.shiftKey &&
        !e.metaKey)
    );
  };

  return {
    submitKey,
    shouldSubmit,
  };
}

export type RenderPrompt = Pick<Prompt, "title" | "content">;

export function PromptHints(props: {
  prompts: RenderPrompt[];
  onPromptSelect: (prompt: RenderPrompt) => void;
}) {
  const noPrompts = props.prompts.length === 0;
  const [selectIndex, setSelectIndex] = useState(0);
  const selectedRef = useRef<HTMLDivElement>(null);

  useEffect(() => {
    setSelectIndex(0);
  }, [props.prompts.length]);

  useEffect(() => {
    const onKeyDown = (e: KeyboardEvent) => {
      if (noPrompts || e.metaKey || e.altKey || e.ctrlKey) {
        return;
      }
      // arrow up / down to select prompt
      const changeIndex = (delta: number) => {
        e.stopPropagation();
        e.preventDefault();
        const nextIndex = Math.max(
          0,
          Math.min(props.prompts.length - 1, selectIndex + delta),
        );
        setSelectIndex(nextIndex);
        selectedRef.current?.scrollIntoView({
          block: "center",
        });
      };

      if (e.key === "ArrowUp") {
        changeIndex(1);
      } else if (e.key === "ArrowDown") {
        changeIndex(-1);
      } else if (e.key === "Enter") {
        const selectedPrompt = props.prompts.at(selectIndex);
        if (selectedPrompt) {
          props.onPromptSelect(selectedPrompt);
        }
      }
    };

    window.addEventListener("keydown", onKeyDown);

    return () => window.removeEventListener("keydown", onKeyDown);
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [props.prompts.length, selectIndex]);

  if (noPrompts) return null;
  return (
    <div className={styles["prompt-hints"]}>
      {props.prompts.map((prompt, i) => (
        <div
          ref={i === selectIndex ? selectedRef : null}
          className={
            styles["prompt-hint"] +
            ` ${i === selectIndex ? styles["prompt-hint-selected"] : ""}`
          }
          key={prompt.title + i.toString()}
          onClick={() => props.onPromptSelect(prompt)}
          onMouseEnter={() => setSelectIndex(i)}
        >
          <div className={styles["hint-title"]}>{prompt.title}</div>
          <div className={styles["hint-content"]}>{prompt.content}</div>
        </div>
      ))}
    </div>
  );
}

function ClearContextDivider() {
  const chatStore = useChatStore();

  return (
    <div
      className={styles["clear-context"]}
      onClick={() =>
        chatStore.updateCurrentSession(
          (session) => (session.clearContextIndex = undefined),
        )
      }
    >
      <div className={styles["clear-context-tips"]}>{Locale.Context.Clear}</div>
      <div className={styles["clear-context-revert-btn"]}>
        {Locale.Context.Revert}
      </div>
    </div>
  );
}

export function ChatAction(props: {
  text: string;
  icon: JSX.Element;
  onClick: () => void;
}) {
  const iconRef = useRef<HTMLDivElement>(null);
  const textRef = useRef<HTMLDivElement>(null);
  const [width, setWidth] = useState({
    full: 16,
    icon: 16,
  });

  function updateWidth() {
    if (!iconRef.current || !textRef.current) return;
    const getWidth = (dom: HTMLDivElement) => dom.getBoundingClientRect().width;
    const textWidth = getWidth(textRef.current);
    const iconWidth = getWidth(iconRef.current);
    setWidth({
      full: textWidth + iconWidth,
      icon: iconWidth,
    });
  }

  return (
    <div
      className={`${styles["chat-input-action"]} clickable`}
      onClick={() => {
        props.onClick();
        setTimeout(updateWidth, 1);
      }}
      onMouseEnter={updateWidth}
      onTouchStart={updateWidth}
      style={
        {
          "--icon-width": `${width.icon}px`,
          "--full-width": `${width.full}px`,
        } as React.CSSProperties
      }
    >
      <div ref={iconRef} className={styles["icon"]}>
        {props.icon}
      </div>
      <div className={styles["text"]} ref={textRef}>
        {props.text}
      </div>
    </div>
  );
}

function useScrollToBottom(
  scrollRef: RefObject<HTMLDivElement>,
  detach: boolean = false,
) {
  // for auto-scroll

  const [autoScroll, setAutoScroll] = useState(true);

  function scrollDomToBottom() {
    const dom = scrollRef.current;
    if (dom) {
      requestAnimationFrame(() => {
        setAutoScroll(true);
        dom.scrollTo(0, dom.scrollHeight);
      });
    }
  }

  // auto scroll
  useEffect(() => {
    if (autoScroll && !detach) {
      scrollDomToBottom();
    }
  });

  return {
    scrollRef,
    autoScroll,
    setAutoScroll,
    scrollDomToBottom,
  };
}

export function ChatActions(props: {
  setUserInput: (value: string) => void;
  doSubmit: (userInput: string) => void;
  uploadImage: () => void;
  setAttachImages: (images: string[]) => void;
  setUploading: (uploading: boolean) => void;
  showPromptModal: () => void;
  scrollToBottom: () => void;
  showPromptHints: () => void;
  hitBottom: boolean;
  uploading: boolean;
}) {
  const config = useAppConfig();
  const navigate = useNavigate();
  const chatStore = useChatStore();

  // switch themes
  const theme = config.theme;

  function nextTheme() {
    const themes = [Theme.Auto, Theme.Light, Theme.Dark];
    const themeIndex = themes.indexOf(theme);
    const nextIndex = (themeIndex + 1) % themes.length;
    const nextTheme = themes[nextIndex];
    config.update((config) => (config.theme = nextTheme));
  }

  // stop all responses
  const couldStop = ChatControllerPool.hasPending();
  const stopAll = () => ChatControllerPool.stopAll();

  // switch model
  const currentModel = chatStore.currentSession().mask.modelConfig.model;
  const currentProviderName =
    chatStore.currentSession().mask.modelConfig?.providerName ||
    ServiceProvider.OpenAI;
  const allModels = useAllModels();
  const models = useMemo(() => {
    const filteredModels = allModels.filter((m) => m.available);
    const defaultModel = filteredModels.find((m) => m.isDefault);

    if (defaultModel) {
      const arr = [
        defaultModel,
        ...filteredModels.filter((m) => m !== defaultModel),
      ];
      return arr;
    } else {
      return filteredModels;
    }
  }, [allModels]);
  const currentModelName = useMemo(() => {
    const model = models.find(
      (m) =>
        m.name == currentModel &&
        m?.provider?.providerName == currentProviderName,
    );
    return model?.displayName ?? "";
  }, [models, currentModel, currentProviderName]);
  const [showModelSelector, setShowModelSelector] = useState(false);
  const [showPluginSelector, setShowPluginSelector] = useState(false);
  const [showUploadImage, setShowUploadImage] = useState(false);

  type GuessList = string[]
  const [guessList, setGuessList] = useState<GuessList>([]);

  const [showSizeSelector, setShowSizeSelector] = useState(false);
  const dalle3Sizes: DalleSize[] = ["1024x1024", "1792x1024", "1024x1792"];
  const currentSize =
    chatStore.currentSession().mask.modelConfig?.size ?? "1024x1024";
  const session = chatStore.currentSession();

  useEffect(() => {
    const show = isVisionModel(currentModel);
    setShowUploadImage(show);
    if (!show) {
      props.setAttachImages([]);
      props.setUploading(false);
    }

    // if current model is not available
    // switch to first available model
    const isUnavaliableModel = !models.some((m) => m.name === currentModel);
    if (isUnavaliableModel && models.length > 0) {
      // show next model to default model if exist
      let nextModel = models.find((model) => model.isDefault) || models[0];
      chatStore.updateCurrentSession((session) => {
        session.mask.modelConfig.model = nextModel.name;
        session.mask.modelConfig.providerName = nextModel?.provider?.providerName as ServiceProvider;
      });
      showToast(
        nextModel?.provider?.providerName == "ByteDance"
          ? nextModel.displayName
          : nextModel.name,
      );
    }
  }, [chatStore, currentModel, models]);

  return (
    <div className={styles["chat-input-actions"]}>
      {showModelSelector && (
        <Selector
          defaultSelectedValue={`${currentModel}@${currentProviderName}`}
          items={models.map((m) => ({
            title: `${m.displayName}${m?.provider?.providerName
              ? "(" + m?.provider?.providerName + ")"
              : ""
              }`,
            value: `${m.name}@${m?.provider?.providerName}`,
          }))}
          onClose={() => setShowModelSelector(false)}
          onSelection={(s) => {
            if (s.length === 0) return;
            const [model, providerName] = s[0].split("@");
            chatStore.updateCurrentSession((session) => {
              session.mask.modelConfig.model = model as ModelType;
              session.mask.modelConfig.providerName =
                providerName as ServiceProvider;
              session.mask.syncGlobalConfig = false;
            });
            if (providerName == "ByteDance") {
              const selectedModel = models.find(
                (m) =>
                  m.name == model && m?.provider?.providerName == providerName,
              );
              showToast(selectedModel?.displayName ?? "");
            } else {
              showToast(model);
            }
          }}
        />
      )}

      {isDalle3(currentModel) && (
        <ChatAction
          onClick={() => setShowSizeSelector(true)}
          text={currentSize}
          icon={<SizeIcon />}
        />
      )}

      {showSizeSelector && (
        <Selector
          defaultSelectedValue={currentSize}
          items={dalle3Sizes.map((m) => ({
            title: m,
            value: m,
          }))}
          onClose={() => setShowSizeSelector(false)}
          onSelection={(s) => {
            if (s.length === 0) return;
            const size = s[0];
            chatStore.updateCurrentSession((session) => {
              session.mask.modelConfig.size = size;
            });
            showToast(size);
          }}
        />
      )}

      {showPluginSelector && (
        <Selector
          multiple
          defaultSelectedValue={chatStore.currentSession().mask?.plugin}
          items={[
            {
              title: Locale.Plugin.Artifacts,
              value: Plugin.Artifacts,
            },
          ]}
          onClose={() => setShowPluginSelector(false)}
          onSelection={(s) => {
            const plugin = s[0];
            chatStore.updateCurrentSession((session) => {
              session.mask.plugin = s;
            });
            if (plugin) {
              showToast(plugin);
            }
          }}
        />
      )}
    </div>
  );
}

export function EditMessageModal(props: { onClose: () => void }) {
  const chatStore = useChatStore();
  const session = chatStore.currentSession();
  const [messages, setMessages] = useState(session.messages.slice());

  return (
    <div className="modal-mask">
      <Modal
        title={Locale.Chat.EditMessage.Title}
        onClose={props.onClose}
        actions={[
          <IconButton
            text={Locale.UI.Cancel}
            icon={<CancelIcon />}
            key="cancel"
            onClick={() => {
              props.onClose();
            }}
          />,
          <IconButton
            type="primary"
            text={Locale.UI.Confirm}
            icon={<ConfirmIcon />}
            key="ok"
            onClick={() => {
              chatStore.updateCurrentSession(
                (session) => (session.messages = messages),
              );
              props.onClose();
            }}
          />,
        ]}
      >
        <List>
          <ListItem
            title={Locale.Chat.EditMessage.Topic.Title}
            subTitle={Locale.Chat.EditMessage.Topic.SubTitle}
          >
            <input
              type="text"
              value={session.topic}
              onInput={(e) =>
                chatStore.updateCurrentSession(
                  (session) => (session.topic = e.currentTarget.value),
                )
              }
            ></input>
          </ListItem>
        </List>
        <ContextPrompts
          context={messages}
          updateContext={(updater) => {
            const newMessages = messages.slice();
            updater(newMessages);
            setMessages(newMessages);
          }}
        />
      </Modal>
    </div>
  );
}

export function DeleteImageButton(props: { deleteImage: () => void }) {
  return (
    <div className={styles["delete-image"]} onClick={props.deleteImage}>
      <DeleteIcon />
    </div>
  );
}

function _Chat() {
  type RenderMessage = ChatMessage & { preview?: boolean };

  const chatStore = useChatStore();
  const session = chatStore.currentSession();
  const config = useAppConfig();
  config.sendPreviewBubble = false;
  const fontSize = config.fontSize;
  const fontFamily = config.fontFamily;

  const [showExport, setShowExport] = useState(false);

  const inputRef = useRef<HTMLTextAreaElement>(null);
  const [userInput, setUserInput] = useState("");
  const [isLoading, setIsLoading] = useState(false);
  const { submitKey, shouldSubmit } = useSubmitHandler();
  const scrollRef = useRef<HTMLDivElement>(null);
  const isScrolledToBottom = scrollRef?.current
    ? Math.abs(
      scrollRef.current.scrollHeight -
      (scrollRef.current.scrollTop + scrollRef.current.clientHeight),
    ) <= 1
    : false;
  const { setAutoScroll, scrollDomToBottom } = useScrollToBottom(
    scrollRef,
    isScrolledToBottom,
  );
  const [hitBottom, setHitBottom] = useState(true);
  const isMobileScreen = useMobileScreen();
  const navigate = useNavigate();
  const [attachImages, setAttachImages] = useState<string[]>([]);
  const [uploading, setUploading] = useState(false);

  // prompt hints
  const promptStore = usePromptStore();
  const [promptHints, setPromptHints] = useState<RenderPrompt[]>([]);
  const onSearch = useDebouncedCallback(
    (text: string) => {
      const matchedPrompts = promptStore.search(text);
      setPromptHints(matchedPrompts);
    },
    100,
    { leading: true, trailing: true },
  );

  useEffect(() => {
    chatStore.updateCurrentSession((session) => {
      session.appId = '1881269958412521255';
    });
  }, [])

  const [inputRows, setInputRows] = useState(2);
  const measure = useDebouncedCallback(
    () => {
      const rows = inputRef.current ? autoGrowTextArea(inputRef.current) : 1;
      const inputRows = Math.min(
        20,
        Math.max(2 + Number(!isMobileScreen), rows),
      );
      setInputRows(inputRows);
    },
    100,
    {
      leading: true,
      trailing: true,
    },
  );

  // eslint-disable-next-line react-hooks/exhaustive-deps
  useEffect(measure, [userInput]);

  // chat commands shortcuts
  const chatCommands = useChatCommand({
    new: () => chatStore.newSession(),
    newm: () => navigate(Path.NewChat),
    prev: () => chatStore.nextSession(-1),
    next: () => chatStore.nextSession(1),
    clear: () =>
      chatStore.updateCurrentSession(
        (session) => (session.clearContextIndex = session.messages.length),
      ),
    del: () => chatStore.deleteSession(chatStore.currentSessionIndex),
  });

  // only search prompts when user input is short
  const SEARCH_TEXT_LIMIT = 30;
  const onInput = (text: string) => {
    setUserInput(text);
    const n = text.trim().length;

    // clear search results
    if (n === 0) {
      setPromptHints([]);
    } else if (text.match(ChatCommandPrefix)) {
      setPromptHints(chatCommands.search(text));
    } else if (!config.disablePromptHint && n < SEARCH_TEXT_LIMIT) {
      // check if need to trigger auto completion
      if (text.startsWith("/")) {
        let searchText = text.slice(1);
        onSearch(searchText);
      }
    }
  };

  const doSubmit = (userInput: string) => {
    if (userInput.trim() === "") return;
    const matchCommand = chatCommands.match(userInput);
    if (matchCommand.matched) {
      setUserInput("");
      setPromptHints([]);
      matchCommand.invoke();
      return;
    }
    setIsLoading(true);
    chatStore.onUserInput(fileList, userInput, attachImages).then(() => setIsLoading(false));
    setAttachImages([]);
    localStorage.setItem(LAST_INPUT_KEY, userInput);
    setUserInput("");
    setPromptHints([]);
    if (!isMobileScreen) inputRef.current?.focus();
    setAutoScroll(true);
  };

  const onPromptSelect = (prompt: RenderPrompt) => {
    setTimeout(() => {
      setPromptHints([]);

      const matchedChatCommand = chatCommands.match(prompt.content);
      if (matchedChatCommand.matched) {
        // if user is selecting a chat command, just trigger it
        matchedChatCommand.invoke();
        setUserInput("");
      } else {
        // or fill the prompt
        setUserInput(prompt.content);
      }
      inputRef.current?.focus();
    }, 30);
  };

  // stop response
  const onUserStop = (messageId: string) => {
    ChatControllerPool.stop(session.id, messageId);
  };

  useEffect(() => {
    chatStore.updateCurrentSession((session) => {
      const stopTiming = Date.now() - REQUEST_TIMEOUT_MS;
      session.messages.forEach((m) => {
        // check if should stop all stale messages
        if (m.isError || new Date(m.date).getTime() < stopTiming) {
          if (m.streaming) {
            m.streaming = false;
          }

          if (m.content.length === 0) {
            m.isError = true;
            m.content = prettyObject({
              error: true,
              message: "empty response",
            });
          }
        }
      });

      // auto sync mask config from global config
      if (session.mask.syncGlobalConfig) {
        console.log("[Mask] syncing from global, name = ", session.mask.name);
        session.mask.modelConfig = { ...config.modelConfig };
      }
    });
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, []);

  // check if should send message
  const onInputKeyDown = (e: React.KeyboardEvent<HTMLTextAreaElement>) => {
    if (
      e.key === "ArrowUp" &&
      userInput.length <= 0 &&
      !(e.metaKey || e.altKey || e.ctrlKey)
    ) {
      setUserInput(localStorage.getItem(LAST_INPUT_KEY) ?? "");
      e.preventDefault();
      return;
    }
    if (shouldSubmit(e) && promptHints.length === 0) {
      doSubmit(userInput);
      e.preventDefault();
    }
  };

  const onRightClick = (e: any, message: ChatMessage) => {
    // copy to clipboard
    if (selectOrCopy(e.currentTarget, getMessageTextContent(message))) {
      if (userInput.length === 0) {
        setUserInput(getMessageTextContent(message));
      }

      e.preventDefault();
    }
  };

  const deleteMessage = (msgId?: string) => {
    chatStore.updateCurrentSession(
      (session) =>
        (session.messages = session.messages.filter((m) => m.id !== msgId)),
    );
  };

  const onDelete = (msgId: string) => {
    deleteMessage(msgId);
  };

  const onResend = (message: ChatMessage) => {
    // when it is resending a message
    // 1. for a user's message, find the next bot response
    // 2. for a bot's message, find the last user's input
    // 3. delete original user input and bot's message
    // 4. resend the user's input

    const resendingIndex = session.messages.findIndex(
      (m) => m.id === message.id,
    );

    if (resendingIndex < 0 || resendingIndex >= session.messages.length) {
      console.error("[Chat] failed to find resending message", message);
      return;
    }

    let userMessage: ChatMessage | undefined;
    let botMessage: ChatMessage | undefined;

    if (message.role === "assistant") {
      // if it is resending a bot's message, find the user input for it
      botMessage = message;
      for (let i = resendingIndex; i >= 0; i -= 1) {
        if (session.messages[i].role === "user") {
          userMessage = session.messages[i];
          break;
        }
      }
    } else if (message.role === "user") {
      // if it is resending a user's input, find the bot's response
      userMessage = message;
      for (let i = resendingIndex; i < session.messages.length; i += 1) {
        if (session.messages[i].role === "assistant") {
          botMessage = session.messages[i];
          break;
        }
      }
    }

    if (userMessage === undefined) {
      console.error("[Chat] failed to resend", message);
      return;
    }

    // delete the original messages
    deleteMessage(userMessage.id);
    deleteMessage(botMessage?.id);

    // resend the message
    setIsLoading(true);
    const textContent = getMessageTextContent(userMessage);
    const images = getMessageImages(userMessage);
    chatStore.onUserInput([], textContent, images).then(() => setIsLoading(false));
    inputRef.current?.focus();
  };

  const onPinMessage = (message: ChatMessage) => {
    chatStore.updateCurrentSession((session) =>
      session.mask.context.push(message),
    );

    showToast(Locale.Chat.Actions.PinToastContent, {
      text: Locale.Chat.Actions.PinToastAction,
      onClick: () => {
        setShowPromptModal(true);
      },
    });
  };

  const context: RenderMessage[] = useMemo(() => {
    return session.mask.hideContext ? [] : session.mask.context.slice();
  }, [session.mask.context, session.mask.hideContext]);
  const accessStore = useAccessStore();

  if (
    context.length === 0 &&
    session.messages.at(0)?.content !== BOT_HELLO.content
  ) {
    const copiedHello = Object.assign({}, BOT_HELLO);
    if (!accessStore.isAuthorized()) {
      copiedHello.content = Locale.Error.Unauthorized;
    }
    context.push(copiedHello);
  }

  // preview messages
  const renderMessages = useMemo(() => {
    return context.concat(session.messages as RenderMessage[]).concat(
      isLoading
        ? [
          {
            ...createMessage({
              role: "assistant",
              content: "……",
            }),
            preview: true,
          },
        ]
        : [],
    ).concat(
      userInput.length > 0 && config.sendPreviewBubble
        ? [
          {
            ...createMessage({
              role: "user",
              content: userInput,
            }),
            preview: true,
          },
        ]
        : [],
    );
  }, [
    config.sendPreviewBubble,
    context,
    isLoading,
    session.messages,
    userInput,
  ]);

  const [msgRenderIndex, _setMsgRenderIndex] = useState(
    Math.max(0, renderMessages.length - CHAT_PAGE_SIZE),
  );

  function setMsgRenderIndex(newIndex: number) {
    newIndex = Math.min(renderMessages.length - CHAT_PAGE_SIZE, newIndex);
    newIndex = Math.max(0, newIndex);
    _setMsgRenderIndex(newIndex);
  }

  const messages = useMemo(() => {
    const endRenderIndex = Math.min(
      msgRenderIndex + 3 * CHAT_PAGE_SIZE,
      renderMessages.length,
    );
    return renderMessages.slice(msgRenderIndex, endRenderIndex);
  }, [msgRenderIndex, renderMessages]);

  const onChatBodyScroll = (e: HTMLElement) => {
    const bottomHeight = e.scrollTop + e.clientHeight;
    const edgeThreshold = e.clientHeight;

    const isTouchTopEdge = e.scrollTop <= edgeThreshold;
    const isTouchBottomEdge = bottomHeight >= e.scrollHeight - edgeThreshold;
    const isHitBottom =
      bottomHeight >= e.scrollHeight - (isMobileScreen ? 4 : 10);

    const prevPageMsgIndex = msgRenderIndex - CHAT_PAGE_SIZE;
    const nextPageMsgIndex = msgRenderIndex + CHAT_PAGE_SIZE;

    if (isTouchTopEdge && !isTouchBottomEdge) {
      setMsgRenderIndex(prevPageMsgIndex);
    } else if (isTouchBottomEdge) {
      setMsgRenderIndex(nextPageMsgIndex);
    }

    setHitBottom(isHitBottom);
    setAutoScroll(isHitBottom);
  };

  function scrollToBottom() {
    setMsgRenderIndex(renderMessages.length - CHAT_PAGE_SIZE);
    scrollDomToBottom();
  }

  // clear context index = context length + index in messages
  const clearContextIndex =
    (session.clearContextIndex ?? -1) >= 0
      ? session.clearContextIndex! + context.length - msgRenderIndex
      : -1;

  const [showPromptModal, setShowPromptModal] = useState(false);

  const clientConfig = useMemo(() => getClientConfig(), []);

  const autoFocus = !isMobileScreen; // wont auto focus on mobile screen
  const showMaxIcon = !isMobileScreen && !clientConfig?.isApp;

  useCommand({
    fill: setUserInput,
    submit: (text) => {
      doSubmit(text);
    },
    code: (text) => {
      if (accessStore.disableFastLink) return;
      console.log("[Command] got code from url: ", text);
      showConfirm(Locale.URLCommand.Code + `code = ${text}`).then((res) => {
        if (res) {
          accessStore.update((access) => (access.accessCode = text));
        }
      });
    },
    settings: (text) => {
      if (accessStore.disableFastLink) return;

      try {
        const payload = JSON.parse(text) as {
          key?: string;
          url?: string;
        };

        console.log("[Command] got settings from url: ", payload);

        if (payload.key || payload.url) {
          showConfirm(
            Locale.URLCommand.Settings +
            `\n${JSON.stringify(payload, null, 4)}`,
          ).then((res) => {
            if (!res) return;
            if (payload.key) {
              accessStore.update(
                (access) => (access.openaiApiKey = payload.key!),
              );
            }
            if (payload.url) {
              accessStore.update((access) => (access.openaiUrl = payload.url!));
            }
            accessStore.update((access) => (access.useCustomConfig = true));
          });
        }
      } catch {
        console.error("[Command] failed to get settings from url: ", text);
      }
    },
  });

  // edit / insert message modal
  const [isEditingMessage, setIsEditingMessage] = useState(false);

  // remember unfinished input
  useEffect(() => {
    // try to load from local storage
    const key = UNFINISHED_INPUT(session.id);
    const mayBeUnfinishedInput = localStorage.getItem(key);
    if (mayBeUnfinishedInput && userInput.length === 0) {
      setUserInput(mayBeUnfinishedInput);
      localStorage.removeItem(key);
    }

    const dom = inputRef.current;
    return () => {
      localStorage.setItem(key, dom?.value ?? "");
    };
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, []);

  const handlePaste = useCallback(
    async (event: React.ClipboardEvent<HTMLTextAreaElement>) => {
      const currentModel = chatStore.currentSession().mask.modelConfig.model;
      if (!isVisionModel(currentModel)) {
        return;
      }
      const items = (event.clipboardData || window.clipboardData).items;
      for (const item of items) {
        if (item.kind === "file" && item.type.startsWith("image/")) {
          event.preventDefault();
          const file = item.getAsFile();
          if (file) {
            const images: string[] = [];
            images.push(...attachImages);
            images.push(
              ...(await new Promise<string[]>((res, rej) => {
                setUploading(true);
                const imagesData: string[] = [];
                uploadImageRemote(file).then((dataUrl) => {
                  imagesData.push(dataUrl);
                  setUploading(false);
                  res(imagesData);
                }).catch((e) => {
                  setUploading(false);
                  rej(e);
                });
              })),
            );
            const imagesLength = images.length;

            if (imagesLength > 3) {
              images.splice(3, imagesLength - 3);
            }
            setAttachImages(images);
          }
        }
      }
    },
    [attachImages, chatStore],
  );

  async function uploadImage() {
    const images: string[] = [];
    images.push(...attachImages);

    images.push(
      ...(await new Promise<string[]>((res, rej) => {
        const fileInput = document.createElement("input");
        fileInput.type = "file";
        fileInput.accept =
          "image/png, image/jpeg, image/webp, image/heic, image/heif";
        fileInput.multiple = true;
        fileInput.onchange = (event: any) => {
          setUploading(true);
          const files = event.target.files;
          const imagesData: string[] = [];
          for (let i = 0; i < files.length; i++) {
            const file = event.target.files[i];
            uploadImageRemote(file).then((dataUrl) => {
              imagesData.push(dataUrl);
              if (
                imagesData.length === 3 ||
                imagesData.length === files.length
              ) {
                setUploading(false);
                res(imagesData);
              }
            }).catch((e) => {
              setUploading(false);
              rej(e);
            });
          }
        };
        fileInput.click();
      })),
    );

    const imagesLength = images.length;
    if (imagesLength > 3) {
      images.splice(3, imagesLength - 3);
    }
    setAttachImages(images);
  }

  const [fileList, setFileList] = useState<any[]>([]);

  // 上传配置
  const uploadConfig: UploadProps = {
    action: '/deepseek-api' + '/upload/file',
    method: 'POST',
    accept: ['.pdf', '.txt', '.doc', '.docx'].join(','),
  };

  interface FileIconProps {
    fileName: string;
  }

  const FileIcon: React.FC<FileIconProps> = (props: FileIconProps) => {
    const style = {
      fontSize: '30px',
      color: '#3875f6',
    }

    let icon = <FileOutlined style={style} />
    if (props.fileName) {
      const suffix = props.fileName.split('.').pop() || '';
      switch (suffix) {
        case 'pdf':
          icon = <FilePdfOutlined style={style} />
          break;
        case 'txt':
          icon = <FileTextOutlined style={style} />
          break;
        case 'doc':
        case 'docx':
          icon = <FileWordOutlined style={style} />
          break;
        default:
          break;
      }
    }
    return icon;
  }

  const [isDeepThink, setIsDeepThink] = useState<boolean>(chatStore.isDeepThink);

  // 切换聊天窗口后清理上传文件信息
  useEffect(() => {
    setFileList([])
  }, [chatStore.currentSession()])

  const couldStop = ChatControllerPool.hasPending();
  const stopAll = () => ChatControllerPool.stopAll();

  return (
    <div className={styles.chat} key={session.id}>
      {
        isMobileScreen && location.pathname !== '/' &&
        <div className="window-header" data-tauri-drag-region>
          <div style={{ display: 'flex', alignItems: 'center' }}
            className={`window-header-title ${styles["chat-body-title"]}`}>
            <div>
              <IconButton
                style={{ padding: 0, marginRight: 20 }}
                icon={<LeftIcon />}
                text={Locale.NewChat.Return}
                onClick={() => navigate('/deepseekChat')}
              />
            </div>
          </div>
        </div>
      }
      <div
        className={styles["chat-body"]}
        ref={scrollRef}
        onScroll={(e) => onChatBodyScroll(e.currentTarget)}
        onMouseDown={() => inputRef.current?.blur()}
        onTouchStart={() => {
          inputRef.current?.blur();
          setAutoScroll(false);
        }}
      >
        <>
          {messages.map((message, i) => {
            const isUser = message.role === "user";
            const isContext = i < context.length;
            const showActions =
              i > 0 &&
              !(message.preview || message.content.length === 0) &&
              !isContext;
            const showTyping = message.preview || message.streaming;

            const shouldShowClearContextDivider = i === clearContextIndex - 1;

            return (
              <Fragment key={message.id}>
                <div
                  className={
                    isUser ? styles["chat-message-user"] : styles["chat-message"]
                  }
                >
                  <div className={styles["chat-message-container"]}
                    style={{ display: 'flex', flexDirection: 'column' }}>
                    <div className={styles["chat-message-header"]}>
                      <div className={styles["chat-message-avatar"]}>
                        {isUser ? (
                          // 在这里换头像
                          <div style={{ position: 'relative' }}>
                            <div
                              style={{
                                position: 'absolute',
                                zIndex: 2,
                                top: '50%',
                                left: '50%',
                                transform: ' translate(-110%, -100%)',
                                fontSize: 14,
                              }}>
                              我
                            </div>
                          </div>
                        ) : (
                          <>
                            {["system"].includes(message.role) ? (
                              <Avatar avatar="2699-fe0f" />
                            ) : (
                              <MaskAvatar
                                avatar={session.mask.avatar}
                                model={
                                  message.model || session.mask.modelConfig.model
                                }
                              />
                            )}
                          </>
                        )}
                      </div>
                    </div>
                    {
                      isUser && message.document && message.document.id &&
                      <a style={{
                        padding: '10px',
                        background: '#f7f7f7',
                        borderRadius: '10px',
                        textDecoration: 'none',
                        color: '#24292f',
                        display: 'flex',
                        alignItems: 'center'
                      }} href={message.document.url} target="_blank">
                        <FileIcon fileName={message.document.name} />
                        <div style={{ marginLeft: 8, fontSize: '14px' }}>
                          {message.document.name}
                        </div>
                      </a>
                    }
                    {/* {showTyping && (
                      <div className={styles["chat-message-status"]}>
                        正在输入…
                      </div>
                    )} */}
                    <div className={styles["chat-message-item"]}>
                      <Markdown
                        key={message.streaming ? "loading" : "done"}
                        content={getMessageTextContent(message)}
                        loading={
                          (message.preview || message.streaming) &&
                          message.content.length === 0 &&
                          !isUser
                        }
                        onDoubleClickCapture={() => {
                          if (!isMobileScreen) return;
                          setUserInput(getMessageTextContent(message));
                        }}
                        fontSize={fontSize}
                        fontFamily={fontFamily}
                        parentRef={scrollRef}
                        defaultShow={i >= messages.length - 6}
                      />
                      {getMessageImages(message).length == 1 && (
                        <img
                          className={styles["chat-message-item-image"]}
                          src={getMessageImages(message)[0]}
                          alt=""
                        />
                      )}
                      {getMessageImages(message).length > 1 && (
                        <div
                          className={styles["chat-message-item-images"]}
                          style={
                            {
                              "--image-count": getMessageImages(message).length,
                            } as React.CSSProperties
                          }
                        >
                          {getMessageImages(message).map((image, index) => {
                            return (
                              <img
                                className={
                                  styles["chat-message-item-image-multi"]
                                }
                                key={index}
                                src={image}
                                alt=""
                              />
                            );
                          })}
                        </div>
                      )}
                    </div>
                  </div>
                </div>
                {shouldShowClearContextDivider && <ClearContextDivider />}
              </Fragment>
            );
          })}
        </>
      </div>
      <div className={styles["chat-input-panel"]}>
        <ChatActions
          setUserInput={setUserInput}
          doSubmit={doSubmit}
          uploadImage={uploadImage}
          setAttachImages={setAttachImages}
          setUploading={setUploading}
          showPromptModal={() => setShowPromptModal(true)}
          scrollToBottom={scrollToBottom}
          hitBottom={hitBottom}
          uploading={uploading}
          showPromptHints={() => {
            if (promptHints.length > 0) {
              setPromptHints([]);
              return;
            }
            inputRef.current?.focus();
            setUserInput("/");
            onSearch("");
          }}
        />
        {
          fileList.length > 0 &&
          <div style={{ marginBottom: 20 }}>
            <Upload
              fileList={fileList}
              onRemove={(file) => {
                setFileList(fileList.filter(item => item.uid !== file.uid));
              }}
            />
          </div>
        }
        <label
          className={`${styles["chat-input-panel-inner"]} ${attachImages.length != 0
            ? styles["chat-input-panel-inner-attach"]
            : ""
            }`}
          htmlFor="chat-input"
        >
          <textarea
            id="chat-input"
            ref={inputRef}
            className={styles["chat-input2"]}
            placeholder={Locale.Chat.Input(submitKey)}
            onInput={(e) => onInput(e.currentTarget.value)}
            value={userInput}
            onKeyDown={onInputKeyDown}
            onFocus={scrollToBottom}
            onClick={scrollToBottom}
            onPaste={handlePaste}
            rows={inputRows}
            autoFocus={autoFocus}
            style={{
              fontSize: config.fontSize,
              fontFamily: config.fontFamily,
            }}
          />
          {attachImages.length != 0 && (
            <div className={styles["attach-images"]}>
              {attachImages.map((image, index) => {
                return (
                  <div
                    key={index}
                    className={styles["attach-image"]}
                    style={{ backgroundImage: `url("${image}")` }}
                  >
                    <div className={styles["attach-image-mask"]}>
                      <DeleteImageButton
                        deleteImage={() => {
                          setAttachImages(
                            attachImages.filter((_, i) => i !== index),
                          );
                        }}
                      />
                    </div>
                  </div>
                );
              })}
            </div>
          )}
        </label>
        <div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center', marginTop: 10 }}>
          <div style={{ display: 'flex', alignItems: 'center' }}>
            {/*深度思考R1按钮*/}
            <Tooltip
              title={
                <span style={{
                  fontSize: 12,
                  lineHeight: 1.4,
                  minHeight: 24,
                  padding: '4px 8px',

                }}>
                  {isDeepThink ? '关闭深度思考模式' : '启用深度思考模式 (R1模型)'}
                </span>
              }
              placement="left"
            >
              <div
                style={{
                  padding: '0 12px',
                  height: 28,
                  borderRadius: 18,
                  fontSize: 12,
                  display: 'flex',
                  justifyContent: 'center',
                  alignItems: 'center',
                  marginRight: 10,
                  cursor: 'pointer',
                  background: isDeepThink ? '#dee9fc' : '#f3f4f6',
                  color: isDeepThink ? '#3875f6' : '#000000',
                  border: `1px solid ${isDeepThink ? '#3875f6' : 'transparent'}`,
                  transition: 'all 0.2s ease',
                  userSelect: 'none'
                }}
                onClick={() => {
                  setIsDeepThink(!isDeepThink);
                  chatStore.setIsDeepThink(!isDeepThink);
                }}
              >
                <img
                  src={isDeepThink ? sdsk_selected.src : sdsk.src}
                  style={{
                    width: 18,
                    height: 18,
                  }}
                />
                <div style={{ marginLeft: 5 }}>
                  深度思考 (R1)
                </div>
              </div>
            </Tooltip>
            {/*联网搜索按钮*/}
            <div
              style={{
                padding: '0 12px',
                height: 28,
                borderRadius: 18,
                fontSize: 12,
                background: '#f3f4f6',
                display: 'flex',
                justifyContent: 'center',
                alignItems: 'center'
              }}
            >
              <img
                src={hlw.src}
                style={{
                  width: 18,
                  height: 18,
                }}
              />
              <div style={{ marginLeft: 5 }}>
                联网搜索
              </div>
            </div>
          </div>
          <div style={{ display: 'flex', alignItems: 'center' }}>
            <div style={{ marginRight: 10 }}>
              <Upload
                {...uploadConfig}
                showUploadList={false}
                maxCount={1}
                onChange={(info) => {
                  const fileList = info.fileList.map((file) => {
                    const data = file.response;
                    return {
                      ...file,
                      url: data?.document_url || file.url,
                      documentId: data?.document_id || '',
                    }
                  });
                  setFileList(fileList);
                  if (info.file.status === 'done') {// 上传成功
                    const { code, message: msg } = info.file.response;
                    if (code === 200) {
                      message.success('上传成功');
                    } else {
                      message.error(msg);
                    }
                  } else if (info.file.status === 'error') {// 上传失败
                    message.error('上传失败');
                  }
                }}
              >
                <Tooltip
                  title={
                    <div style={{ padding: '4px 8px' }}>
                      <div style={{
                        fontSize: 12,
                        lineHeight: 1.4,
                        marginBottom: 6,
                      }}>
                        上传附件 (识别文本和图表中的内容)
                      </div>
                      <div style={{
                        fontSize: 10,
                        color: '#8c8c8c',
                        lineHeight: 1.4,
                      }}>
                        <span>
                          仅支持单个PDF/Word/TXT文件格式
                        </span>
                        <span>
                          (单个文件≤50MB)
                        </span>
                      </div>
                    </div>
                  }
                  placement="top"
                >
                  <div
                    style={{
                      width: 28,
                      height: 28,
                      borderRadius: '50%',
                      background: '#4357d2',
                      display: 'flex',
                      justifyContent: 'center',
                      alignItems: 'center',
                      cursor: 'pointer',
                      transition: 'all 0.2s ease',
                      userSelect: 'none'
                    }}
                  >
                    <PaperClipOutlined style={{ color: '#FFFFFF', fontSize: '18px' }} />
                  </div>
                </Tooltip>
              </Upload>
            </div>
            <div
              style={{
                width: 28,
                height: 28,
                borderRadius: '50%',
                background: '#4357d2',
                display: 'flex',
                justifyContent: 'center',
                alignItems: 'center',
                cursor: 'pointer',
              }}
              onClick={() => {
                if (couldStop) {
                  stopAll();
                } else {
                  doSubmit(userInput);
                }
              }}
            >
              {
                couldStop ?
                  <div style={{ width: 13, height: 13, background: '#FFFFFF', borderRadius: 2 }}></div>
                  :
                  <div style={{ transform: 'rotate(-45deg)', padding: '0px 0px 3px 5px' }}>
                    <SendOutlined style={{ color: '#FFFFFF' }} />
                  </div>
              }
              <div>
              </div>
            </div>
          </div>
        </div>
        <div style={{ marginTop: 10, textAlign: 'center', color: '#888888', fontSize: 12 }}>
          内容由AI生成，仅供参考
        </div>
      </div>
      {
        showExport && (
          <ExportMessageModal onClose={() => setShowExport(false)} />
        )
      }
      {
        isEditingMessage && (
          <EditMessageModal
            onClose={() => {
              setIsEditingMessage(false);
            }}
          />
        )
      }
    </div >
  );
}

export function Chat() {
  const chatStore = useChatStore();
  const sessionIndex = chatStore.currentSessionIndex;

  useEffect(() => {
    chatStore.setModel('DeepSeek');
  }, []);

  return <_Chat key={sessionIndex}></_Chat>;
}