lib/utils/message.ts

import { Message } from '@prisma/client';
import { MessageUI } from '../types';

/**
 * The Message we saved to database consists of a prompt and a response
 * for the API to use, we need to break them to 2 messages, User and Assistant(if responded)
 */
export const convertDBMessageToAPIMessage = (
  messages: Message[],
): MessageUI[] => {
  return messages.reduce((acc, message) => {
    const { id, mediaUrl, prompt, result, chatId } = message;
    // fileName could be null if it's example media url
    const [prefix, fileName] = mediaUrl.split(`${chatId}/`);
    if (mediaUrl && prompt) {
      acc.push({
        id: id + '-user',
        role: 'user',
        content: prompt,
        media: [
          fileName
            ? prefix +
              `${chatId}/` +
              encodeURIComponent(decodeURIComponent(fileName))
            : mediaUrl,
        ],
      });
    }
    if (result && result.type === 'final_code') {
      acc.push({
        id: id + '-assistant',
        role: 'assistant',
        content: result?.payload.code,
      });
    }
    return acc;
  }, [] as MessageUI[]);
};