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import type { AgentEvent, AgentSharedState, PendingAction, Suggestion } from "./events";
import type { AgentTransport, ImageAttachment } from "./transport";
export type ChatMessage = {
id: string;
role: "user" | "assistant" | "system";
text: string;
};
export type UseAgentConversation = {
messages: ChatMessage[];
suggestions: Suggestion[];
pendingAction: PendingAction | null;
/** Last STATE_SNAPSHOT from the agent — null until the first turn ends. */
sharedState: AgentSharedState | null;
isStreaming: boolean;
error: string | null;
send: (text: string, images?: ImageAttachment[]) => Promise<void>;
confirm: () => Promise<void>;
cancel: () => Promise<void>;
reset: () => void;
};
/**
* Folds the normalized `AgentEvent` stream into chat state. Transport-agnostic:
* it is handed an `AgentTransport` and never imports a concrete transport or
* any SDK. Swap SSE → CopilotKit by passing a different transport — this hook
* and every screen using it are unchanged.
*/
export function useAgentConversation(transport: AgentTransport): UseAgentConversation {
const [messages, setMessages] = useState<ChatMessage[]>([]);
const [suggestions, setSuggestions] = useState<Suggestion[]>([]);
const [pendingAction, setPendingAction] = useState<PendingAction | null>(null);
const [sharedState, setSharedState] = useState<AgentSharedState | null>(null);
const [isStreaming, setIsStreaming] = useState(false);
const [error, setError] = useState<string | null>(null);
const threadIdRef = useRef<string | null>(null);
const ensureThread = useCallback(async (): Promise<string> => {
if (threadIdRef.current) return threadIdRef.current;
const thread = await transport.createThread();
threadIdRef.current = thread.id;
return thread.id;
}, [transport]);
const applyEvent = useCallback((event: AgentEvent): void => {
switch (event._tag) {
case "TextStart":
setMessages((prev) =>
prev.some((m) => m.id === event.messageId)
? prev
: [...prev, { id: event.messageId, role: "assistant", text: "" }],
);
break;
case "TextDelta":
setMessages((prev) =>
prev.some((m) => m.id === event.messageId)
? prev.map((m) => (m.id === event.messageId ? { ...m, text: m.text + event.delta } : m))
: [...prev, { id: event.messageId, role: "assistant", text: event.delta }],
);
break;
case "Blocks":
setSuggestions(event.suggestions);
break;
case "PendingAction":
setPendingAction(event.pending);
break;
case "SharedState":
setSharedState(event.state);
// The snapshot is authoritative for pending state: an explicit null
// clears a stale card that a missed decision would otherwise leave up.
if (event.state.pendingAction === null) {
setPendingAction(null);
}
break;
case "RunError":
setError(event.message);
break;
default:
// RunStarted / ToolCall* / ToolResult / Metadata / TextEnd / RunFinished
// carry no chat-visible state in this v1.
break;
}
}, []);
const send = useCallback(
async (text: string, images?: ImageAttachment[]): Promise<void> => {
const trimmed = text.trim();
if (!trimmed || isStreaming) return;
setError(null);
setSuggestions([]);
setMessages((prev) => [...prev, { id: `u-${Date.now()}`, role: "user", text: trimmed }]);
setIsStreaming(true);
try {
const threadId = await ensureThread();
await transport.streamTurn({ threadId, message: trimmed, images }, { onEvent: applyEvent });
} catch (e) {
setError(e instanceof Error ? e.message : "Something went wrong.");
} finally {
setIsStreaming(false);
}
},
[transport, ensureThread, applyEvent, isStreaming],
);
const confirm = useCallback(async (): Promise<void> => {
const pending = pendingAction;
const threadId = threadIdRef.current;
if (!pending || !threadId) return;
setPendingAction(null);
try {
const result = await transport.confirm(threadId, pending.pendingActionId);
setMessages((prev) => [
...prev,
{
id: `s-${Date.now()}`,
role: "system",
text: `✓ Action ${result.status}.`,
},
]);
} catch (e) {
setError(e instanceof Error ? e.message : "Confirm failed.");
}
}, [transport, pendingAction]);
const cancel = useCallback(async (): Promise<void> => {
const pending = pendingAction;
const threadId = threadIdRef.current;
if (!pending || !threadId) return;
setPendingAction(null);
try {
await transport.cancel(threadId, pending.pendingActionId);
setMessages((prev) => [
...prev,
{ id: `s-${Date.now()}`, role: "system", text: "Action cancelled." },
]);
} catch (e) {
setError(e instanceof Error ? e.message : "Cancel failed.");
}
}, [transport, pendingAction]);
const reset = useCallback((): void => {
threadIdRef.current = null;
setMessages([]);
setSuggestions([]);
setPendingAction(null);
setSharedState(null);
setError(null);
setIsStreaming(false);
}, []);
return {
messages,
suggestions,
pendingAction,
sharedState,
isStreaming,
error,
send,
confirm,
cancel,
reset,
};
}
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