export const SUPPORTED_LOCALES = ['th', 'en', 'ja', 'zh', 'vi', 'ko', 'lo', 'it'] as const;
export type Locale = typeof SUPPORTED_LOCALES[number];

export const DEFAULT_LOCALE: Locale = 'th';

export function isSupportedLocale(locale: string): locale is Locale {
  return SUPPORTED_LOCALES.includes(locale as Locale);
}

export function getPathWithoutLocale(path: string): string {
  const segments = path.split('/').filter(Boolean);
  if (segments.length > 0 && isSupportedLocale(segments[0])) {
    segments.shift();
  }
  return '/' + segments.join('/');
}

export function getPathWithLocale(path: string, locale: string): string {
  if (!path) return `/${locale}`;
  if (path.startsWith('http')) return path; // Skip absolute external URLs
  
  const pathWithoutLocale = getPathWithoutLocale(path);
  if (pathWithoutLocale === '/') return `/${locale}`;
  return `/${locale}${pathWithoutLocale}`;
}