// The Vercel Blob side of the relay (store igneum-relay): the only module that imports @vercel/blob, so everything
// else loads without node_modules. api/relay.mjs hands these three to lib/handler.mjs; the tests hand it fakes.
import { put, del } from '@vercel/blob';
import { generateClientTokenFromReadWriteToken } from '@vercel/blob/client';
import { blobPath, MAX_BLOB } from './relay.mjs';

export async function storeBuffer(name, buf, contentType) {
  const r = await put(blobPath(name), buf, {
    access: 'public', addRandomSuffix: true, contentType: contentType || 'application/octet-stream',
  });
  return { url: r.url, size: buf.length };
}

export async function clientUploadToken(name, size) {
  const pathname = blobPath(name);
  const token = await generateClientTokenFromReadWriteToken({
    pathname,
    addRandomSuffix: true,
    allowOverwrite: false,
    maximumSizeInBytes: MAX_BLOB,
    validUntil: Date.now() + 60 * 60 * 1000,
  });
  return { token, pathname, put_url: `https://vercel.com/api/blob/?pathname=${encodeURIComponent(pathname)}`, api_version: '11', max: MAX_BLOB, size };
}

/** Deletes the blobs behind the given URLs (X26: a deleted or expired row takes its file with it). Never throws. */
export async function deleteBlobs(urls) {
  const list = [...new Set(urls.filter(Boolean))];
  if (!list.length) return 0;
  try { await del(list); return list.length; } catch { return 0; }
}