// Originally from devkit.
// See: https://github.com/angular/angular-cli/blob/2c8b12f/packages/angular_devkit/build_angular/src/angular-cli-files/models/webpack-configs/utils.ts
export interface HashFormat {
  chunk: string;
  extract: string;
  file: string;
  script: string;
}

export function getOutputHashFormat(option: string, length = 20): HashFormat {
  const hashFormats: { [option: string]: HashFormat } = {
    none: { chunk: '', extract: '', file: '', script: '' },
    media: { chunk: '', extract: '', file: `.[hash:${length}]`, script: '' },
    bundles: {
      chunk: `.[chunkhash:${length}]`,
      extract: `.[contenthash:${length}]`,
      file: '',
      script: `.[hash:${length}]`
    },
    all: {
      chunk: `.[chunkhash:${length}]`,
      extract: `.[contenthash:${length}]`,
      file: `.[hash:${length}]`,
      script: `.[hash:${length}]`
    }
  };
  return hashFormats[option] || hashFormats['none'];
}