/**
 * Fallback-safe i18n for self-bundled React entries (improvement-plan P2-4).
 *
 * Delegates to `window.wp.i18n` (loaded via the `wp-i18n` script dependency +
 * `wp_set_script_translations`) when present, and falls back to identity
 * functions otherwise so the UI never crashes if wp-i18n is missing or loads
 * late. Resolution happens at call time, not module load, so translations
 * registered before our module scripts execute are always picked up.
 *
 * Signature-compatible with @wordpress/i18n: `__( text, domain )`.
 * Text domain for all plugin strings: `llmagnet-llm-txt-generator`.
 *
 * NOTE: the editor bundle aliases `@wordpress/i18n` to src/wp-externals/i18n.ts
 * (hard dependency on wp-i18n). Shared/self-bundled components import from
 * this module instead.
 */

function wpI18n() {
  return typeof window !== 'undefined' ? window.wp?.i18n : undefined;
}

/**
 * Minimal printf fallback: supports %s, %d, %f and positional %1$s forms,
 * which covers every placeholder used in this plugin's strings.
 */
function fallbackSprintf(format: string, ...args: Array<string | number>): string {
  let cursor = 0;
  return format.replace(/%(\d+\$)?[sdf]/g, (match, position?: string) => {
    const index = position ? parseInt(position, 10) - 1 : cursor++;
    const value = args[index];
    return value === undefined ? match : String(value);
  });
}

/** Translate a string. */
export function __(text: string, domain?: string): string {
  const impl = wpI18n();
  return impl?.__ ? impl.__(text, domain) : text;
}

/** Translate a string with gettext context. */
export function _x(text: string, context: string, domain?: string): string {
  const impl = wpI18n();
  return impl?._x ? impl._x(text, context, domain) : text;
}

/** Translate and retrieve the singular or plural form based on the supplied number. */
export function _n(single: string, plural: string, number: number, domain?: string): string {
  const impl = wpI18n();
  if (impl?._n) {
    return impl._n(single, plural, number, domain);
  }
  return number === 1 ? single : plural;
}

/** Plural form with gettext context. */
export function _nx(
  single: string,
  plural: string,
  number: number,
  context: string,
  domain?: string,
): string {
  const impl = wpI18n();
  if (impl?._nx) {
    return impl._nx(single, plural, number, context, domain);
  }
  return number === 1 ? single : plural;
}

/** printf-style string substitution (wp.i18n sprintf when available). */
export function sprintf(format: string, ...args: Array<string | number>): string {
  const impl = wpI18n();
  if (impl?.sprintf) {
    try {
      return impl.sprintf(format, ...args);
    } catch {
      return fallbackSprintf(format, ...args);
    }
  }
  return fallbackSprintf(format, ...args);
}

/** Whether the current locale is right-to-left. */
export function isRTL(): boolean {
  const impl = wpI18n();
  if (impl?.isRTL) {
    return impl.isRTL();
  }
  return typeof document !== 'undefined' && document.documentElement.dir === 'rtl';
}