Function chatMessagesForInfiniteScroll

site/src/api/queries/chats.ts:617–634

(chatId: string)

const MESSAGES_PAGE_SIZE = 50;

export const chatMessagesForInfiniteScroll = (chatId: string) => ({
	queryKey: chatMessagesKey(chatId),
	initialPageParam: undefined as number | undefined,
	queryFn: ({ pageParam }: { pageParam: number | undefined }) =>
		API.experimental.getChatMessages(chatId, {
			before_id: pageParam,
			limit: MESSAGES_PAGE_SIZE,
		}),
	getNextPageParam: (lastPage: TypesGen.ChatMessagesResponse) => {
		if (!lastPage.has_more || lastPage.messages.length === 0) {
			return undefined;
		}
		// The API returns messages in DESC order (newest first).
		// The last item in the array is the oldest in this page.
		// Use its ID as the cursor for the next (older) page.
		return lastPage.messages[lastPage.messages.length - 1].id;
	},
});

// Cap requested prompts to keep the response small; well under the server-side maximum.
const PROMPT_HISTORY_LIMIT = 500;