export type ToastType = 'success' | 'error' | 'warning' | 'info';

export interface ToastItem {
  id: string;
  type: ToastType;
  message: string;
  duration?: number;
}

// Global toast state
export const toastListeners: ((toasts: ToastItem[]) => void)[] = [];
export const toasts: ToastItem[] = [];

export function notifyListeners() {
  toastListeners.forEach(fn => fn([...toasts]));
}

export function showToast(type: ToastType, message: string, duration = 5000) {
  const id = Math.random().toString(36).slice(2);
  toasts.push({ id, type, message, duration });
  notifyListeners();

  if (duration > 0) {
    setTimeout(() => {
      const idx = toasts.findIndex(t => t.id === id);
      if (idx >= 0) toasts.splice(idx, 1);
      notifyListeners();
    }, duration);
  }
}

export function toast(message: string) { showToast('info', message); }
toast.success = (msg: string) => showToast('success', msg);
toast.error = (msg: string) => showToast('error', msg, 7000);
toast.warning = (msg: string) => showToast('warning', msg);
toast.info = (msg: string) => showToast('info', msg);