import React, { useState, useEffect, useRef, useCallback } from 'react';
import { useSelector, useDispatch } from 'react-redux';
import SubRow from './Content/SubRow';
import Wrapper from './Content/Wrapper';
import MultiMessage from './MultiMessage';
import HoverButtons from './HoverButtons';
import SiblingSwitch from './SiblingSwitch';
import { setConversation, setLatestMessage } from '~/store/convoSlice';
import { setModel, setCustomModel, setCustomGpt, setDisabled } from '~/store/submitSlice';
import { setMessages } from '~/store/messageSlice';
import { fetchById } from '~/utils/fetchers';
import { getIconOfModel } from '~/utils';
import { useMessageHandler } from '~/utils/handleSubmit';

export default function Message({
  message,
  messages,
  scrollToBottom,
  currentEditId,
  setCurrentEditId,
  siblingIdx,
  siblingCount,
  setSiblingIdx
}) {
  const { isSubmitting, model, chatGptLabel, cursor, promptPrefix } = useSelector(state => state.submit);
  const [abortScroll, setAbort] = useState(false);
  const { sender, text, searchResult, isCreatedByUser, error, submitting } = message;
  const textEditor = useRef(null);
  const last = !message?.children?.length;
  const edit = message.messageId == currentEditId;
  const { ask } = useMessageHandler();
  const dispatch = useDispatch();
  // const currentConvo = convoMap[message.conversationId];

  // const notUser = !isCreatedByUser; // sender.toLowerCase() !== 'user';
  // const blinker = submitting && isSubmitting && last && !isCreatedByUser;
  const blinker = submitting && isSubmitting;
  const generateCursor = useCallback(() => {
    if (!blinker) {
      return '';
    }

    if (!cursor) {
      return '';
    }

    return <span className="result-streaming">█</span>;
  }, [blinker, cursor]);

  useEffect(() => {
    if (blinker && !abortScroll) {
      scrollToBottom();
    }
  }, [isSubmitting, blinker, text, scrollToBottom]);

  useEffect(() => {
    if (last) {
      // TODO: stop using conversation.parentMessageId and remove it.
      dispatch(setConversation({ parentMessageId: message?.messageId }));
      dispatch(setLatestMessage({ ...message }));
    }
  }, [last, message]);

  const enterEdit = cancel => setCurrentEditId(cancel ? -1 : message.messageId);

  const handleWheel = () => {
    if (blinker) {
      setAbort(true);
    } else {
      setAbort(false);
    }
  };

  const props = {
    className:
      'w-full border-b border-black/10 dark:border-gray-900/50 text-gray-800 bg-white dark:text-gray-100 group dark:bg-gray-800'
  };

  const icon = getIconOfModel({
    sender,
    isCreatedByUser,
    model,
    searchResult,
    chatGptLabel,
    promptPrefix,
    error
  });

  if (!isCreatedByUser)
    props.className =
      'w-full border-b border-black/10 bg-gray-50 dark:border-gray-900/50 text-gray-800 dark:text-gray-100 group bg-gray-100 dark:bg-[#444654]';

  if (message.bg && searchResult) {
    props.className = message.bg.split('hover')[0];
    props.titleClass = message.bg.split(props.className)[1] + ' cursor-pointer';
  }

  const resubmitMessage = () => {
    const text = textEditor.current.innerText;

    ask({
      text,
      parentMessageId: message?.parentMessageId,
      conversationId: message?.conversationId
    });

    setSiblingIdx(siblingCount - 1);
    enterEdit(true);
  };

  const clickSearchResult = async () => {
    if (!searchResult) return;
    dispatch(setMessages([]));
    const convoResponse = await fetchById('convos', message.conversationId);
    const convo = convoResponse.data;
    if (convo?.chatGptLabel) {
      dispatch(setModel('chatgptCustom'));
      dispatch(setCustomModel(convo.chatGptLabel.toLowerCase()));
    } else {
      dispatch(setModel(convo.model));
      dispatch(setCustomModel(null));
    }

    dispatch(setCustomGpt(convo));
    dispatch(setConversation(convo));
    const { data } = await fetchById('messages', message.conversationId);
    dispatch(setMessages(data));
    dispatch(setDisabled(false));
  };

  return (
    <>
      <div
        {...props}
        onWheel={handleWheel}
        // onClick={clickSearchResult}
      >
        <div className="relative m-auto flex gap-4 p-4 text-base md:max-w-2xl md:gap-6 md:py-6 lg:max-w-2xl lg:px-0 xl:max-w-3xl">
          <div className="relative flex h-[30px] w-[30px] flex-col items-end text-right text-xs md:text-sm">
            {typeof icon === 'string' && icon.match(/[^\\x00-\\x7F]+/) ? (
              <span className=" direction-rtl w-40 overflow-x-scroll">{icon}</span>
            ) : (
              icon
            )}
            <div className="sibling-switch invisible absolute left-0 top-2 -ml-4 flex -translate-x-full items-center justify-center gap-1 text-xs group-hover:visible">
              <SiblingSwitch
                siblingIdx={siblingIdx}
                siblingCount={siblingCount}
                setSiblingIdx={setSiblingIdx}
              />
            </div>
          </div>
          <div className="relative flex w-[calc(100%-50px)] flex-col gap-1 whitespace-pre-wrap md:gap-3 lg:w-[calc(100%-115px)]">
            {searchResult && (
              <SubRow
                classes={props.titleClass + ' rounded'}
                subclasses="switch-result pl-2 pb-2"
                onClick={clickSearchResult}
              >{`${message.title} | ${message.sender}`}</SubRow>
            )}
            <div className="flex flex-grow flex-col gap-3">
              {error ? (
                <div className="flex flex min-h-[20px] flex-grow flex-col items-start gap-4 gap-2 whitespace-pre-wrap text-red-500">
                  <div className="rounded-md border border-red-500 bg-red-500/10 py-2 px-3 text-sm text-gray-600 dark:text-gray-100">
                    {`An error occurred. Please try again in a few moments.\n\nError message: ${text}`}
                  </div>
                </div>
              ) : edit ? (
                <div className="flex min-h-[20px] flex-grow flex-col items-start gap-4 whitespace-pre-wrap">
                  {/* <div className={`${blinker ? 'result-streaming' : ''} markdown prose dark:prose-invert light w-full break-words`}> */}

                  <div
                    className="markdown prose dark:prose-invert light w-full break-words border-none focus:outline-none"
                    contentEditable={true}
                    ref={textEditor}
                    suppressContentEditableWarning={true}
                  >
                    {text}
                  </div>
                  <div className="mt-2 flex w-full justify-center text-center">
                    <button
                      className="btn btn-primary relative mr-2"
                      disabled={isSubmitting}
                      onClick={resubmitMessage}
                    >
                      Save & Submit
                    </button>
                    <button
                      className="btn btn-neutral relative"
                      onClick={() => enterEdit(true)}
                    >
                      Cancel
                    </button>
                  </div>
                </div>
              ) : (
                <div className="flex min-h-[20px] flex-grow flex-col items-start gap-4 whitespace-pre-wrap">
                  {/* <div className={`${blinker ? 'result-streaming' : ''} markdown prose dark:prose-invert light w-full break-words`}> */}
                  <div className="markdown prose dark:prose-invert light w-full break-words">
                    <Wrapper
                      text={text}
                      generateCursor={generateCursor}
                      isCreatedByUser={isCreatedByUser}
                      searchResult={searchResult}
                    />
                  </div>
                </div>
              )}
            </div>
            <HoverButtons
              model={model}
              visible={!error && isCreatedByUser && !edit && !searchResult}
              onClick={() => enterEdit()}
            />
            <SubRow subclasses="switch-container">
              <SiblingSwitch
                siblingIdx={siblingIdx}
                siblingCount={siblingCount}
                setSiblingIdx={setSiblingIdx}
              />
            </SubRow>
          </div>
        </div>
      </div>
      <MultiMessage
        messageList={message.children}
        messages={messages}
        scrollToBottom={scrollToBottom}
        currentEditId={currentEditId}
        setCurrentEditId={setCurrentEditId}
      />
    </>
  );
}