digitalfabrik/integreat-app

import { RESOURCE_CACHE_DIR_PATH } from './DatabaseConnector'
import { getExtension } from './helpers'

const getResourceCacheFilesDirPath = (city: string): string => `${RESOURCE_CACHE_DIR_PATH}/${city}/files`

const getExtensionWithDot = (urlString: string) => {
  const extension = getExtension(urlString)

  if (!extension) {
    return ''
  }

  return `.${extension}`
}
/**
 * Builds a file path for a resource given the specified parameters.
 *
 * @throws {Error} If urlString is invalid or it is not possible to get an extension from it
 * @returns a non-empty URL-string which points to a file
 */

export default (urlString: string, city: string, urlHash: string): string =>
  `${getResourceCacheFilesDirPath(city)}/${urlHash}${getExtensionWithDot(urlString)}`