File size: 5,372 Bytes
de93e67 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 | import { useEffect, useRef, useMemo, useCallback } from 'react';
import { Box, Stack, Typography } from '@mui/material';
import MessageBubble from './MessageBubble';
import ThinkingIndicator from './ThinkingIndicator';
import { useAgentStore } from '@/store/agentStore';
import { useSessionStore } from '@/store/sessionStore';
import { apiFetch } from '@/utils/api';
import { logger } from '@/utils/logger';
import type { Message } from '@/types/agent';
interface MessageListProps {
messages: Message[];
isProcessing: boolean;
}
function getGreeting(): string {
const h = new Date().getHours();
if (h < 12) return 'Morning';
if (h < 17) return 'Afternoon';
return 'Evening';
}
/** Minimal greeting shown when the conversation is empty. */
function WelcomeGreeting() {
const { user } = useAgentStore();
const firstName = user?.name?.split(' ')[0] || user?.username;
const greeting = firstName ? `${getGreeting()}, ${firstName}` : getGreeting();
return (
<Box
sx={{
flex: 1,
display: 'flex',
flexDirection: 'column',
alignItems: 'center',
justifyContent: 'center',
py: 8,
gap: 1.5,
}}
>
<Typography
sx={{
fontFamily: 'monospace',
fontSize: '1.6rem',
color: 'var(--text)',
fontWeight: 600,
}}
>
{greeting}
</Typography>
<Typography
color="text.secondary"
sx={{ fontFamily: 'monospace', fontSize: '0.9rem' }}
>
Let's build something impressive?
</Typography>
</Box>
);
}
export default function MessageList({ messages, isProcessing }: MessageListProps) {
const scrollContainerRef = useRef<HTMLDivElement>(null);
const stickToBottom = useRef(true);
const { activeSessionId } = useSessionStore();
const { removeLastTurn, currentTurnMessageId } = useAgentStore();
// ── Scroll-to-bottom helper ─────────────────────────────────────
const scrollToBottom = useCallback(() => {
const el = scrollContainerRef.current;
if (el) el.scrollTop = el.scrollHeight;
}, []);
// ── Track user scroll intent ────────────────────────────────────
useEffect(() => {
const el = scrollContainerRef.current;
if (!el) return;
const onScroll = () => {
const distFromBottom = el.scrollHeight - el.scrollTop - el.clientHeight;
stickToBottom.current = distFromBottom < 80;
};
el.addEventListener('scroll', onScroll, { passive: true });
return () => el.removeEventListener('scroll', onScroll);
}, []);
// ── Auto-scroll on new messages / state changes ─────────────────
useEffect(() => {
if (stickToBottom.current) scrollToBottom();
}, [messages, isProcessing, scrollToBottom]);
// ── Auto-scroll on DOM mutations (streaming content growth) ─────
useEffect(() => {
const el = scrollContainerRef.current;
if (!el) return;
const observer = new MutationObserver(() => {
if (stickToBottom.current) {
el.scrollTop = el.scrollHeight;
}
});
observer.observe(el, {
childList: true,
subtree: true,
characterData: true,
});
return () => observer.disconnect();
}, []);
// Find the index of the last user message (start of the last turn)
const lastUserMsgId = useMemo(() => {
for (let i = messages.length - 1; i >= 0; i--) {
if (messages[i].role === 'user') return messages[i].id;
}
return null;
}, [messages]);
const handleUndoLastTurn = useCallback(async () => {
if (!activeSessionId) return;
try {
await apiFetch(`/api/undo/${activeSessionId}`, { method: 'POST' });
removeLastTurn(activeSessionId);
} catch (e) {
logger.error('Undo failed:', e);
}
}, [activeSessionId, removeLastTurn]);
return (
<Box
ref={scrollContainerRef}
sx={{
flex: 1,
overflow: 'auto',
px: { xs: 0.5, sm: 1, md: 2 },
py: { xs: 2, md: 3 },
display: 'flex',
flexDirection: 'column',
}}
>
<Stack
spacing={3}
sx={{
maxWidth: 880,
mx: 'auto',
width: '100%',
flex: messages.length === 0 && !isProcessing ? 1 : undefined,
}}
>
{messages.length === 0 && !isProcessing ? (
<WelcomeGreeting />
) : (
messages.map((msg) => (
<MessageBubble
key={msg.id}
message={msg}
isLastTurn={msg.id === lastUserMsgId}
onUndoTurn={handleUndoLastTurn}
isProcessing={isProcessing}
isStreaming={isProcessing && msg.id === currentTurnMessageId}
/>
))
)}
{/* Show thinking dots only when processing but no streaming message yet */}
{isProcessing && !currentTurnMessageId && <ThinkingIndicator />}
{/* Sentinel — keeps scroll anchor at the bottom */}
<div />
</Stack>
</Box>
);
}
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