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import type { Message } from "$lib/types/Message";
import type { EndpointMessage } from "./endpoints";
import { downloadFile } from "../files/downloadFile";
import type { ObjectId } from "mongodb";
export async function preprocessMessages(
messages: Message[],
convId: ObjectId
): Promise<EndpointMessage[]> {
return Promise.resolve(messages)
.then((msgs) => downloadFiles(msgs, convId))
.then((msgs) => injectClipboardFiles(msgs))
.then(stripEmptyInitialSystemMessage);
}
async function downloadFiles(messages: Message[], convId: ObjectId): Promise<EndpointMessage[]> {
return Promise.all(
messages.map<Promise<EndpointMessage>>((message) =>
Promise.all((message.files ?? []).map((file) => downloadFile(file.value, convId))).then(
(files) => ({ ...message, files })
)
)
);
}
async function injectClipboardFiles(messages: EndpointMessage[]) {
return Promise.all(
messages.map((message) => {
const plaintextFiles = message.files
?.filter((file) => file.mime === "application/vnd.chatui.clipboard")
.map((file) => Buffer.from(file.value, "base64").toString("utf-8"));
if (!plaintextFiles || plaintextFiles.length === 0) return message;
return {
...message,
content: `${plaintextFiles.join("\n\n")}\n\n${message.content}`,
files: message.files?.filter((file) => file.mime !== "application/vnd.chatui.clipboard"),
};
})
);
}
/**
* Remove an initial system message if its content is empty/whitespace only.
* This prevents sending an empty system prompt to any provider.
*/
function stripEmptyInitialSystemMessage(messages: EndpointMessage[]): EndpointMessage[] {
if (!messages?.length) return messages;
const first = messages[0];
if (first?.from !== "system") return messages;
const content = first?.content as unknown;
const isEmpty = typeof content === "string" ? content.trim().length === 0 : false;
if (isEmpty) {
return messages.slice(1);
}
return messages;
}
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