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

interface Toast {
  id: string;
  message: string;
  type: 'success' | 'error' | 'info' | 'warning';
  duration?: number;
}

interface ToastContextType {
  showToast: (message: string, type: Toast['type'], duration?: number) => void;
}

const ToastContext = createContext<ToastContextType | undefined>(undefined);

export const useToast = () => {
  const context = useContext(ToastContext);
  if (!context) {
    throw new Error('useToast must be used within a ToastProvider');
  }
  return context;
};

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

  const removeToast = useCallback((id: string) => {
    setToasts(prev => prev.filter(toast => toast.id !== id));
  }, []);

  const showToast = useCallback((message: string, type: Toast['type'], duration = 5000) => {
    const id = Date.now().toString();
    const toast: Toast = { id, message, type, duration };
    
    setToasts(prev => [...prev, toast]);
    
    if (duration > 0) {
      setTimeout(() => removeToast(id), duration);
    }
  }, [removeToast]);

  return (
    <ToastContext.Provider value={{ showToast }}>
      {children}
      <div className="fixed top-4 right-4 z-50 space-y-2">
        {toasts.map(toast => (
          <div
            key={toast.id}
            className={`
              max-w-sm p-4 rounded-lg shadow-lg transform transition-all duration-300 ease-in-out
              ${toast.type === 'success' ? 'bg-green-500 text-white' : ''}
              ${toast.type === 'error' ? 'bg-red-500 text-white' : ''}
              ${toast.type === 'info' ? 'bg-blue-500 text-white' : ''}
              ${toast.type === 'warning' ? 'bg-amber-500 text-white' : ''}
            `}
          >
            <div className="flex items-center justify-between">
              <div className="flex items-center">
                {toast.type === 'success' && (
                  <svg className="w-5 h-5 mr-2" fill="currentColor" viewBox="0 0 20 20">
                    <path fillRule="evenodd" d="M10 18a8 8 0 100-16 8 8 0 000 16zm3.707-9.293a1 1 0 00-1.414-1.414L9 10.586 7.707 9.293a1 1 0 00-1.414 1.414l2 2a1 1 0 001.414 0l4-4z" clipRule="evenodd" />
                  </svg>
                )}
                {toast.type === 'error' && (
                  <svg className="w-5 h-5 mr-2" fill="currentColor" viewBox="0 0 20 20">
                    <path fillRule="evenodd" d="M10 18a8 8 0 100-16 8 8 0 000 16zM8.707 7.293a1 1 0 00-1.414 1.414L8.586 10l-1.293 1.293a1 1 0 101.414 1.414L10 11.414l1.293 1.293a1 1 0 001.414-1.414L11.414 10l1.293-1.293a1 1 0 00-1.414-1.414L10 8.586 8.707 7.293z" clipRule="evenodd" />
                  </svg>
                )}
                {toast.type === 'info' && (
                  <svg className="w-5 h-5 mr-2" fill="currentColor" viewBox="0 0 20 20">
                    <path fillRule="evenodd" d="M18 10a8 8 0 11-16 0 8 8 0 0116 0zm-7-4a1 1 0 11-2 0 1 1 0 012 0zM9 9a1 1 0 000 2v3a1 1 0 001 1h1a1 1 0 100-2v-3a1 1 0 00-1-1H9z" clipRule="evenodd" />
                  </svg>
                )}
                {toast.type === 'warning' && (
                  <svg className="w-5 h-5 mr-2" fill="currentColor" viewBox="0 0 20 20">
                    <path fillRule="evenodd" d="M8.257 3.099c.765-1.36 2.722-1.36 3.486 0l5.58 9.92c.75 1.334-.213 2.98-1.742 2.98H4.42c-1.53 0-2.493-1.646-1.743-2.98l5.58-9.92zM11 13a1 1 0 11-2 0 1 1 0 012 0zm-1-8a1 1 0 00-1 1v3a1 1 0 002 0V6a1 1 0 00-1-1z" clipRule="evenodd" />
                  </svg>
                )}
                <span className="text-sm font-medium">{toast.message}</span>
              </div>
              <button
                onClick={() => removeToast(toast.id)}
                className="ml-4 text-white hover:text-gray-200 transition-colors"
              >
                <svg className="w-4 h-4" fill="currentColor" viewBox="0 0 20 20">
                  <path fillRule="evenodd" d="M4.293 4.293a1 1 0 011.414 0L10 8.586l4.293-4.293a1 1 0 111.414 1.414L11.414 10l4.293 4.293a1 1 0 01-1.414 1.414L10 11.414l-4.293 4.293a1 1 0 01-1.414-1.414L8.586 10 4.293 5.707a1 1 0 010-1.414z" clipRule="evenodd" />
                </svg>
              </button>
            </div>
          </div>
        ))}
      </div>
    </ToastContext.Provider>
  );
};