import type { ISeoShippingFromWooCommerce } from '../../service/seo/seo.interface';

/** The shipping fields of the settings form, as the zones fill them. */
export interface ShippingFill {
  rate: string;
  free_over: string;
  countries: string;
}

/**
 * The form values the zones give, or null when no zone maps.
 *
 * @param found - What the route read of WooCommerce's zones.
 * @return The fields to set, countries spaced as a person types them.
 */
export const shippingFill = (
  found: ISeoShippingFromWooCommerce
): ShippingFill | null =>
  found.rate === ''
    ? null
    : {
        rate: found.rate,
        free_over: found.free_over,
        countries: found.countries.split(',').filter(Boolean).join(', '),
      };

/**
 * What was filled, in one sentence, or why nothing was.
 *
 * @param found - What the route read of WooCommerce's zones.
 * @return The sentence shown under the button.
 */
export const shippingFillSummary = (
  found: ISeoShippingFromWooCommerce
): string => {
  const fill = shippingFill(found);
  if (!fill) {
    return 'Nothing filled: no zone charges a fixed rate the schema can state.';
  }
  const zones =
    found.zones.length === 1 ? 'zone' : `${found.zones.length} zones`;
  const price =
    fill.rate === '0'
      ? 'Free shipping'
      : `A flat ${fill.rate}${fill.free_over ? `, free from ${fill.free_over},` : ''}`;
  return `${price} to ${fill.countries}, from the ${zones} ${found.zones.join(', ')}. Check it and save the changes to put it in the schema.`;
};