import spawn from 'nano-spawn';
import env from '../../.config/env';
import { basename } from 'node:path';

export async function b2Download(fromS3Key: string, tmpFilePath: string): Promise<string> {
  await spawn('b2', ['file', 'download', `b2://${env.AWS_BUCKET}/${fromS3Key}`, tmpFilePath]);
  return fromS3Key;
}

/**
 * We put the hls package under `/:collection/:id/hls/` so we can use Bunny CDN's token singing 
 * to allow token access to all the files within that folder
 * @see https://support.bunny.net/hc/en-us/articles/360016055099-How-to-sign-URLs-for-BunnyCDN-Token-Authentication
 */
export function getS3KeyTarget(collectionId: string, vodId: string, filename: string, subFolder: string | null) {
  if (!filename) throw new Error('third param filename was missing');
  if (!vodId) throw new Error('second param vodId was missing');
  if (!collectionId) throw new Error('first param collectionId was missing');

  let s3KeyTarget: string;
  let name = basename(filename);
  if (subFolder) {
    s3KeyTarget = `${collectionId}/${vodId}/${subFolder}/${name}`;
  } else {
    s3KeyTarget = `${collectionId}/${vodId}/${name}`;
  }
  return s3KeyTarget
}