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import { createElement, useEffect, useRef, useState } from '@wordpress/element';
import { ScrollDownButton } from '@agent/components/ScrollDownButton';
import { ScrollIntoViewOnce } from '@agent/components/ScrollIntoViewOnce';
import { AgentMessage } from '@agent/components/messages/AgentMessage';
import { StatusMessage } from '@agent/components/messages/StatusMessage';
import { UserMessage } from '@agent/components/messages/UserMessage';
import { WorkflowComponent } from '@agent/components/messages/WorkflowComponent';
import { WorkflowMessage } from '@agent/components/messages/WorkflowMessage';
import { useChatStore } from '@agent/state/chat';
import { useGlobalStore } from '@agent/state/global';
import { useWorkflowStore } from '@agent/state/workflows';

export const ChatMessages = () => {
	const { open } = useGlobalStore();
	const { messages } = useChatStore();
	const { getWhenFinishedToolProps, getWorkflow } = useWorkflowStore();
	const workflow = getWorkflow();
	const whenFinishedToolProps = getWhenFinishedToolProps();
	const whenFinishedComponent = workflow?.whenFinished?.component;
	const [canScrollDown, setCanScrollDown] = useState(false);
	const containerRef = useRef(null);
	const isFreshPageLoad = useRef(true);

// If last message is a user message, move it to the top
	const isUserMessage =
		messages.filter(({ type }) => type !== 'status').at(-1)?.details?.role ===
		'user';

useEffect(() => {
		if (!containerRef.current || !open) return;
		if (!isFreshPageLoad.current) return;
		isFreshPageLoad.current = false;
		// Scroll to the bottom of the chat container on load
		containerRef.current.scrollTo({ top: containerRef.current.scrollHeight });
		return () => {
			isFreshPageLoad.current = true;
		};
	}, [open]);

// Handles scrolling to the top of the last user message
	// TODO: if the user sends in a long message, maybe we scroll to the bottom
	// of the message offset by 2-3 lines
	useEffect(() => {
		if (!containerRef.current) return;
		if (!isUserMessage) return;
		const c = containerRef.current;
		const messages = c.querySelectorAll('[data-agent-message-role="user"]');
		const last = messages[messages.length - 1];
		if (!last || messages.length < 2) return;
		const scrollArea = c.querySelector('#extendify-agent-chat-scroll-area');
		const lastRect = last.getBoundingClientRect();
		const innerHeight = Array.from(scrollArea.children).reduce(
			(sum, child) => sum + child.offsetHeight,
			0,
		);
		const minHeight = innerHeight + c.clientHeight - lastRect.height;
		scrollArea.style.minHeight = `${minHeight}px`;
		last.scrollIntoView({ behavior: 'smooth', block: 'start' });
	}, [isUserMessage, messages]);

// Handles the scroll down button visibility
	useEffect(() => {
		if (!containerRef.current) return;
		const c = containerRef.current;
		const last = c.querySelector(
			'#extendify-agent-chat-scroll-area > :last-child',
		);
		if (!last) return;

const observer = new IntersectionObserver(
			([entry]) => {
				const containerRect = c.getBoundingClientRect();
				const lastRect = entry.boundingClientRect;
				const isBelowViewport = lastRect.bottom > containerRect.bottom;
				setCanScrollDown(!entry.isIntersecting && isBelowViewport);
			},
			{ root: c },
		);
		observer.observe(last);
		return () => observer.disconnect();
	}, [messages]);

return (
		<div
			ref={containerRef}
			style={{ overscrollBehavior: 'contain' }}
			className="relative flex-grow overflow-y-auto overflow-x-hidden p-1 pb-0 text-sm text-gray-900 md:p-2">
			<div id="extendify-agent-chat-scroll-area">
				{messages.map((message) => {
					const isLastMessage = messages.at(-1)?.id === message.id;
					const freshLoad = isFreshPageLoad.current;
					if (message.details?.role === 'user') {
						return <UserMessage key={message.id} message={message} />;
					}
					if (message.details?.role === 'assistant') {
						return (
							<AgentMessage
								key={message.id}
								animate={!freshLoad}
								message={message}
							/>
						);
					}
					if (message.type === 'workflow') {
						return <WorkflowMessage key={message.id} message={message} />;
					}
					if (message.type === 'workflow-component') {
						return <WorkflowComponent key={message.id} message={message} />;
					}
					if (
						message.type === 'status' &&
						// Only show the status if it's last, or a workflow-tool-completed message
						(isLastMessage ||
							['workflow-tool-completed', 'workflow-tool-canceled'].includes(
								message.details?.type,
							))
					) {
						const isError = message.details?.type === 'error';
						return (
							<StatusMessage
								animate={!isError}
								key={message.id}
								status={message}
							/>
						);
					}
					return null;
				})}
				{!workflow?.needsRedirect?.() &&
				whenFinishedToolProps?.id &&
				whenFinishedComponent ? (
					<ScrollIntoViewOnce>
						{createElement(whenFinishedComponent, whenFinishedToolProps)}
					</ScrollIntoViewOnce>
				) : null}
				{workflow?.needsRedirect?.() ? <workflow.redirectComponent /> : null}
			</div>
			<ScrollDownButton
				canScrollDown={canScrollDown}
				onClick={() => {
					if (!containerRef.current) return;
					const c = containerRef.current;
					// Scroll the last message into view
					const last = c.querySelector(
						'#extendify-agent-chat-scroll-area > :last-child',
					);
					if (!last) return;
					last.scrollIntoView({ behavior: 'smooth', block: 'start' });
				}}
			/>
		</div>
	);
};

Nama File / Folder	Size	Action
buttons	--	NONE
layouts	--	NONE
messages	--	NONE
redirects	--	NONE
tooltip	--	NONE
ChatMessages.jsx	5.355KB	Edit File Delete File Rename
ChatSuggestions.jsx	2.621KB	Edit File Delete File Rename
DOMHighlighter.jsx	8.358KB	Edit File Delete File Rename
GuidedTour.jsx	14.893KB	Edit File Delete File Rename
PageDocument.jsx	1.149KB	Edit File Delete File Rename
Rating.jsx	1.836KB	Edit File Delete File Rename
WelcomeScreen.jsx	1.159KB	Edit File Delete File Rename