import { AddressRegion } from "./AddressRegion";

/**
 * Address utils
 */
export namespace AddressUtils {
  /**
   * Get region from regions and detected region and language
   * @param regions Supported regions
   * @param detectedRegion Detected region
   * @param detectedLanguage Detected language
   */
  export function getRegion(
    regions: string[],
    detectedRegion?: string | null,
    detectedLanguage?: string | null
  ): AddressRegion {
    // Exactly match
    if (detectedRegion && regions.includes(detectedRegion)) {
      const region = AddressRegion.getById(detectedRegion);
      if (region) return region;
    }

    // Match with language
    if (detectedLanguage) {
      const region = regions
        .map((id) => AddressRegion.getById(id)!)
        .find((item) => item.languages.includes(detectedLanguage));
      if (region) region;
    }

    // Default
    return AddressRegion.getById(regions[0])!;
  }
}