| 10 | * request to ensure the model always sees hook context. |
| 11 | */ |
| 12 | export function useDeferredHookMessages( |
| 13 | pendingHookMessages: Promise<HookResultMessage[]> | undefined, |
| 14 | setMessages: (action: React.SetStateAction<Message[]>) => void, |
| 15 | ): () => Promise<void> { |
| 16 | const pendingRef = useRef(pendingHookMessages ?? null) |
| 17 | const resolvedRef = useRef(!pendingHookMessages) |
| 18 | |
| 19 | useEffect(() => { |
| 20 | const promise = pendingRef.current |
| 21 | if (!promise) return |
| 22 | let cancelled = false |
| 23 | promise.then(msgs => { |
| 24 | if (cancelled) return |
| 25 | resolvedRef.current = true |
| 26 | pendingRef.current = null |
| 27 | if (msgs.length > 0) { |
| 28 | setMessages(prev => [...msgs, ...prev]) |
| 29 | } |
| 30 | }) |
| 31 | return () => { |
| 32 | cancelled = true |
| 33 | } |
| 34 | }, [setMessages]) |
| 35 | |
| 36 | return useCallback(async () => { |
| 37 | if (resolvedRef.current || !pendingRef.current) return |
| 38 | const msgs = await pendingRef.current |
| 39 | if (resolvedRef.current) return |
| 40 | resolvedRef.current = true |
| 41 | pendingRef.current = null |
| 42 | if (msgs.length > 0) { |
| 43 | setMessages(prev => [...msgs, ...prev]) |
| 44 | } |
| 45 | }, [setMessages]) |
| 46 | } |
| 47 | |