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import { useState, useEffect, useRef } from 'react';
import Sidebar from './components/Sidebar';
import ChatInterface from './components/ChatInterface';
import { api } from './api';
import './App.css';
function App() {
const [conversations, setConversations] = useState([]);
const [currentConversationId, setCurrentConversationId] = useState(null);
const [currentConversation, setCurrentConversation] = useState(null);
const [isLoading, setIsLoading] = useState(false);
const [pendingInput, setPendingInput] = useState(null);
const abortControllerRef = useRef(null);
// Load conversations on mount
useEffect(() => {
loadConversations();
}, []);
// Load conversation details when selected
useEffect(() => {
if (currentConversationId) {
loadConversation(currentConversationId);
}
}, [currentConversationId]);
const loadConversations = async () => {
try {
const convs = await api.listConversations();
setConversations(convs);
} catch (error) {
console.error('Failed to load conversations:', error);
}
};
const loadConversation = async (id) => {
try {
const conv = await api.getConversation(id);
setCurrentConversation(conv);
} catch (error) {
console.error('Failed to load conversation:', error);
}
};
const handleNewConversation = async () => {
try {
const newConv = await api.createConversation();
setConversations([
{ id: newConv.id, created_at: newConv.created_at, message_count: 0 },
...conversations,
]);
setCurrentConversationId(newConv.id);
} catch (error) {
console.error('Failed to create conversation:', error);
}
};
const handleSelectConversation = (id) => {
setCurrentConversationId(id);
};
const handleStopGeneration = () => {
if (abortControllerRef.current) {
abortControllerRef.current.abort();
abortControllerRef.current = null;
// Recover the last user message into the input box and remove the incomplete pair
setCurrentConversation((prev) => {
const messages = [...prev.messages];
// Find the last user message to recover its content
let recoveredContent = '';
// Remove trailing assistant message (incomplete)
if (messages.length > 0 && messages[messages.length - 1].role === 'assistant') {
messages.pop();
}
// Remove the user message and recover its text
if (messages.length > 0 && messages[messages.length - 1].role === 'user') {
const userMsg = messages.pop();
recoveredContent = userMsg.content;
}
setPendingInput(recoveredContent);
return { ...prev, messages };
});
}
};
const handleSendMessage = async (content) => {
if (!currentConversationId) return;
const controller = new AbortController();
abortControllerRef.current = controller;
setIsLoading(true);
try {
// Optimistically add user message to UI
const userMessage = { role: 'user', content };
setCurrentConversation((prev) => ({
...prev,
messages: [...prev.messages, userMessage],
}));
// Create a partial assistant message that will be updated progressively
const assistantMessage = {
role: 'assistant',
stage1: null,
stage2: null,
stage3: null,
metadata: null,
loading: {
stage1: false,
stage2: false,
stage3: false,
},
};
// Add the partial assistant message
setCurrentConversation((prev) => ({
...prev,
messages: [...prev.messages, assistantMessage],
}));
// Send message with streaming
await api.sendMessageStream(currentConversationId, content, (eventType, event) => {
if (controller.signal.aborted) return;
switch (eventType) {
case 'stage1_start':
setCurrentConversation((prev) => {
const messages = [...prev.messages];
const lastMsg = messages[messages.length - 1];
lastMsg.loading.stage1 = true;
return { ...prev, messages };
});
break;
case 'stage1_complete':
setCurrentConversation((prev) => {
const messages = [...prev.messages];
const lastMsg = messages[messages.length - 1];
lastMsg.stage1 = event.data;
lastMsg.loading.stage1 = false;
return { ...prev, messages };
});
break;
case 'stage2_start':
setCurrentConversation((prev) => {
const messages = [...prev.messages];
const lastMsg = messages[messages.length - 1];
lastMsg.loading.stage2 = true;
return { ...prev, messages };
});
break;
case 'stage2_complete':
setCurrentConversation((prev) => {
const messages = [...prev.messages];
const lastMsg = messages[messages.length - 1];
lastMsg.stage2 = event.data;
lastMsg.metadata = event.metadata;
lastMsg.loading.stage2 = false;
return { ...prev, messages };
});
break;
case 'stage3_start':
setCurrentConversation((prev) => {
const messages = [...prev.messages];
const lastMsg = messages[messages.length - 1];
lastMsg.loading.stage3 = true;
return { ...prev, messages };
});
break;
case 'stage3_complete':
setCurrentConversation((prev) => {
const messages = [...prev.messages];
const lastMsg = messages[messages.length - 1];
lastMsg.stage3 = event.data;
lastMsg.loading.stage3 = false;
return { ...prev, messages };
});
break;
case 'title_complete':
// Reload conversations to get updated title
loadConversations();
break;
case 'complete':
// Stream complete, reload conversations list
loadConversations();
setIsLoading(false);
break;
case 'error':
console.error('Stream error:', event.message);
setIsLoading(false);
break;
default:
console.log('Unknown event type:', eventType);
}
}, controller.signal);
} catch (error) {
if (error.name === 'AbortError') {
// User stopped generation — handleStopGeneration already cleaned up messages
} else {
console.error('Failed to send message:', error);
// Remove optimistic messages on error
setCurrentConversation((prev) => ({
...prev,
messages: prev.messages.slice(0, -2),
}));
}
setIsLoading(false);
abortControllerRef.current = null;
}
};
return (
<div className="app">
<Sidebar
conversations={conversations}
currentConversationId={currentConversationId}
onSelectConversation={handleSelectConversation}
onNewConversation={handleNewConversation}
/>
<ChatInterface
conversation={currentConversation}
onSendMessage={handleSendMessage}
onStopGeneration={handleStopGeneration}
isLoading={isLoading}
pendingInput={pendingInput}
onPendingInputConsumed={() => setPendingInput(null)}
/>
</div>
);
}
export default App;
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