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import React, { useEffect, useState, useRef, useCallback } from 'react';
import { useRecoilValue } from 'recoil';
import { Spinner } from '~/components';
import throttle from 'lodash/throttle';
import { CSSTransition } from 'react-transition-group';
import ScrollToBottom from './ScrollToBottom';
import MultiMessage from './MultiMessage';
import MessageHeader from './MessageHeader';
import { useScreenshot } from '~/utils/screenshotContext.jsx';
import store from '~/store';
export default function Messages({ isSearchView = false }) {
const [currentEditId, setCurrentEditId] = useState(-1);
const [showScrollButton, setShowScrollButton] = useState(false);
const scrollableRef = useRef(null);
const messagesEndRef = useRef(null);
const messagesTree = useRecoilValue(store.messagesTree);
const searchResultMessagesTree = useRecoilValue(store.searchResultMessagesTree);
const _messagesTree = isSearchView ? searchResultMessagesTree : messagesTree;
const conversation = useRecoilValue(store.conversation) || {};
const { conversationId } = conversation;
const { screenshotTargetRef } = useScreenshot();
const handleScroll = () => {
const { scrollTop, scrollHeight, clientHeight } = scrollableRef.current;
const diff = Math.abs(scrollHeight - scrollTop);
const percent = Math.abs(clientHeight - diff) / clientHeight;
if (percent <= 0.2) {
setShowScrollButton(false);
} else {
setShowScrollButton(true);
}
};
useEffect(() => {
const timeoutId = setTimeout(() => {
const { scrollTop, scrollHeight, clientHeight } = scrollableRef.current;
const diff = Math.abs(scrollHeight - scrollTop);
const percent = Math.abs(clientHeight - diff) / clientHeight;
const hasScrollbar = scrollHeight > clientHeight && percent > 0.2;
setShowScrollButton(hasScrollbar);
}, 650);
// Add a listener on the window object
window.addEventListener('scroll', handleScroll);
return () => {
clearTimeout(timeoutId);
window.removeEventListener('scroll', handleScroll);
};
}, [_messagesTree]);
// eslint-disable-next-line react-hooks/exhaustive-deps
const scrollToBottom = useCallback(
throttle(
() => {
messagesEndRef.current?.scrollIntoView({ behavior: 'smooth' });
setShowScrollButton(false);
},
750,
{ leading: true },
),
[messagesEndRef],
);
let timeoutId = null;
const debouncedHandleScroll = () => {
clearTimeout(timeoutId);
timeoutId = setTimeout(handleScroll, 100);
};
const scrollHandler = (e) => {
e.preventDefault();
scrollToBottom();
};
return (
<div
className="flex-1 overflow-y-auto pt-0"
ref={scrollableRef}
onScroll={debouncedHandleScroll}
>
<div className="dark:gpt-dark-gray mb-32 h-auto md:mb-48" ref={screenshotTargetRef}>
<div className="dark:gpt-dark-gray flex h-auto flex-col items-center text-sm">
<MessageHeader isSearchView={isSearchView} />
{_messagesTree === null ? (
<div className="flex h-screen items-center justify-center">
<Spinner />
</div>
) : _messagesTree?.length == 0 && isSearchView ? (
<div className="flex w-full items-center justify-center gap-1 bg-gray-50 p-3 text-sm text-gray-500 dark:border-gray-900/50 dark:bg-gray-800 dark:text-gray-300">
Nothing found
</div>
) : (
<>
<MultiMessage
key={conversationId} // avoid internal state mixture
messageId={conversationId}
conversation={conversation}
messagesTree={_messagesTree}
scrollToBottom={scrollToBottom}
currentEditId={currentEditId}
setCurrentEditId={setCurrentEditId}
isSearchView={isSearchView}
/>
<CSSTransition
in={showScrollButton}
timeout={400}
classNames="scroll-down"
unmountOnExit={false}
// appear
>
{() => showScrollButton && <ScrollToBottom scrollHandler={scrollHandler} />}
</CSSTransition>
</>
)}
<div
className="dark:gpt-dark-gray group h-0 w-full flex-shrink-0 dark:border-gray-900/50"
ref={messagesEndRef}
/>
</div>
</div>
</div>
);
}
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