/** 런타임 플랫폼 — web · desktop(Tauri) · mobile */
export type RuntimePlatform = 'web' | 'desktop' | 'mobile';

export function isDesktop(): boolean {
  if (typeof window === 'undefined') return false;
  if ('__TAURI__' in window || '__TAURI_INTERNALS__' in window) return true;
  return document.documentElement.classList.contains('desktop-client');
}

export function isMobileCapacitor(): boolean {
  if (typeof window === 'undefined') return false;
  try {
    const cap = (window as Window & { Capacitor?: { isNativePlatform?: () => boolean } }).Capacitor;
    return cap?.isNativePlatform?.() === true;
  } catch {
    return false;
  }
}

export function getRuntimePlatform(): RuntimePlatform {
  if (isDesktop()) return 'desktop';
  if (isMobileCapacitor()) return 'mobile';
  return 'web';
}

export function isWeb(): boolean {
  return getRuntimePlatform() === 'web';
}

/** Tauri 데스크톱 — Windows WebView2 */
export function isWindowsDesktop(): boolean {
  if (!isDesktop()) return false;
  return typeof navigator !== 'undefined' && /win/i.test(navigator.userAgent);
}

/** Tauri 데스크톱 — macOS */
export function isMacDesktop(): boolean {
  if (!isDesktop()) return false;
  return typeof navigator !== 'undefined' && /mac/i.test(navigator.userAgent);
}