import React, { createContext, useContext, useState, useCallback } from 'react';

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

interface Toast {
  id: string;
  message: string;
  type: ToastType;
}

interface NotificationContextType {
  showToast: (message: string, type: ToastType) => void;
}

const NotificationContext = createContext<NotificationContextType | undefined>(undefined);

export const NotificationProvider: React.FC<{ children: React.ReactNode }> = ({ children }) => {
  const [toasts, setToasts] = useState<Toast[]>([]);

  const showToast = useCallback((message: string, type: ToastType) => {
    const id = Math.random().toString(36).substring(7);
    setToasts((prev) => [...prev, { id, message, type }]);
    setTimeout(() => {
      setToasts((prev) => prev.filter((t) => t.id !== id));
    }, 5000);
  }, []);

  return (
    <NotificationContext.Provider value={{ showToast }}>
      {children}
      <div className="fixed top-4 right-4 z-50 space-y-2">
        {toasts.map((toast) => (
          <div key={toast.id} className={`p-4 rounded-lg shadow-lg text-white font-medium ${toast.type === 'success' ? 'bg-emerald-600' : toast.type === 'error' ? 'bg-red-600' : 'bg-blue-600'}`}>
            {toast.message}
          </div>
        ))}
      </div>
    </NotificationContext.Provider>
  );
};

export const useNotification = () => {
    const context = useContext(NotificationContext);
    if (!context) throw new Error('useNotification must be used within NotificationProvider');
    return context;
};