/*
  Copyright 2018 Google LLC

  Use of this source code is governed by an MIT-style
  license that can be found in the LICENSE file or at
  https://opensource.org/licenses/MIT.
*/

import prettyBytes from "pretty-bytes";

import type { ManifestTransform } from "../types.js";

export function maximumSizeTransform(maximumFileSizeToCacheInBytes: number): ManifestTransform {
  return (originalManifest) => {
    const warnings: string[] = [];
    const manifest = originalManifest.filter((entry) => {
      if (entry.size <= maximumFileSizeToCacheInBytes) {
        return true;
      }

      warnings.push(
        `${entry.url} is ${prettyBytes(entry.size)}, and won't be precached. Configure maximumFileSizeToCacheInBytes to change this limit.`,
      );
      return false;
    });

    return { manifest, warnings };
  };
}