import type { I18nConfig, LocaleDefinition } from './types.js'

/**
 * Returns all configured locale codes.
 */
export function getLocaleCodes(config: I18nConfig): string[] {
  return config.locales.map((locale) => locale.code)
}

/**
 * Returns the default locale code.
 */
export function getDefaultLocale(config: I18nConfig): string {
  return config.defaultLocale
}

/**
 * Checks if a string is a valid configured locale code.
 */
export function isValidLocale(code: string, config: I18nConfig): boolean {
  return config.locales.some((locale) => locale.code === code)
}

/**
 * Returns the full locale definition for a given code, or undefined if not found.
 */
export function getLocaleDefinition(
  code: string,
  config: I18nConfig,
): LocaleDefinition | undefined {
  return config.locales.find((locale) => locale.code === code)
}