import { sprintf, s__ } from '~/locale';

/**
 * Combines each given item into a noun series sentence fragment. It does this
 * in a way that supports i18n by giving context and punctuation to the locale
 * functions.
 *
 * **Examples:**
 *
 * - `["A", "B"] => "A and B"`
 * - `["A", "B", "C"] => "A, B, and C"`
 *
 * **Why only nouns?**
 *
 * Some languages need a bit more context to translate other series.
 *
 * @param {String[]} items
 */
export const toNounSeriesText = (items, { onlyCommas = false } = {}) => {
  if (items.length === 0) {
    return '';
  } else if (items.length === 1) {
    return sprintf(s__(`nounSeries|%{item}`), { item: items[0] }, false);
  } else if (items.length === 2 && !onlyCommas) {
    return sprintf(
      s__('nounSeries|%{firstItem} and %{lastItem}'),
      {
        firstItem: items[0],
        lastItem: items[1],
      },
      false,
    );
  }

  return items.reduce((item, nextItem, idx) =>
    idx === items.length - 1 && !onlyCommas
      ? sprintf(s__('nounSeries|%{item}, and %{lastItem}'), { item, lastItem: nextItem }, false)
      : sprintf(s__('nounSeries|%{item}, %{nextItem}'), { item, nextItem }, false),
  );
};

export default {
  toNounSeriesText,
};