import { ImageSource } from '../Image.types';

/**
 * Converts a string in blurhash format (`blurhash:/<hash>/<width>/<height>`
 * or <hash>/<width>/<height>) into an `ImageSource`.
 * Note: The blurhash:/ uri scheme is removed, because for backward compatibility reasons,
 * strings without a scheme are assumed to be `blurhash` by default.
 *
 * @return An ImageSource representing the provided blurhash.
 * */
export function resolveBlurhashString(str: string): ImageSource {
  const [blurhash, width, height] = str.replace(/^blurhash:\//, '').split('/');
  return {
    uri: blurhash,
    width: parseInt(width, 10) || 16,
    height: parseInt(height, 10) || 16,
  };
}

/**
 * Converts a string in thumbhash format (`thumbhash:/<hash>` or `<hash>`)
 * into an `ImageSource`.
 * Note: Unlike the `resolveBlurhashString` the `thumbhash:/` scheme has to be present,
 * as the scheme has to be explicitly stated to be interpreted a `thumbhash` source.
 *
 * @return An ImageSource representing the provided thumbhash.
 * */
export function resolveThumbhashString(str: string): ImageSource {
  const hash = str.replace(/^thumbhash:\//, '');
  return {
    uri: 'thumbhash:/' + hash,
  };
}