import React, { createContext, useContext, useState, useCallback } from 'react';
import { Toast } from '../types';
import { X, CheckCircle2, AlertCircle, Info, AlertTriangle } from 'lucide-react';

interface ToastContextData {
  addToast: (toast: Omit<Toast, 'id'>) => void;
  removeToast: (id: string) => void;
}

const ToastContext = createContext<ToastContextData>({} as ToastContextData);

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

  const addToast = useCallback(({ type, title, message, duration = 4000 }: Omit<Toast, 'id'>) => {
    const id = Math.random().toString(36).substring(2, 9);
    const newToast = { id, type, title, message, duration };

    setToasts((state) => [...state, newToast]);

    if (duration > 0) {
        setTimeout(() => {
            removeToast(id);
        }, duration);
    }
  }, []);

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

  return (
    <ToastContext.Provider value={{ addToast, removeToast }}>
      {children}
      {/* Toast Container Rendered Here Globally */}
      <div className="fixed top-4 right-4 z-[9999] flex flex-col gap-2 pointer-events-none">
        {toasts.map((toast) => (
          <div 
            key={toast.id} 
            className={`pointer-events-auto min-w-[300px] max-w-sm rounded-xl p-4 shadow-xl border flex items-start gap-3 animate-slide-in-right transform transition-all duration-300 ${
                toast.type === 'success' ? 'bg-white border-green-100' :
                toast.type === 'error' ? 'bg-white border-red-100' :
                toast.type === 'warning' ? 'bg-white border-amber-100' :
                'bg-white border-blue-100'
            }`}
          >
             <div className={`mt-0.5 ${
                 toast.type === 'success' ? 'text-green-500' :
                 toast.type === 'error' ? 'text-red-500' :
                 toast.type === 'warning' ? 'text-amber-500' :
                 'text-blue-500'
             }`}>
                {toast.type === 'success' && <CheckCircle2 size={20} />}
                {toast.type === 'error' && <AlertCircle size={20} />}
                {toast.type === 'warning' && <AlertTriangle size={20} />}
                {toast.type === 'info' && <Info size={20} />}
             </div>
             <div className="flex-1">
                 <h4 className={`text-sm font-bold ${
                     toast.type === 'success' ? 'text-green-800' :
                     toast.type === 'error' ? 'text-red-800' :
                     toast.type === 'warning' ? 'text-amber-800' :
                     'text-blue-800'
                 }`}>{toast.title}</h4>
                 {toast.message && <p className="text-xs text-slate-500 mt-1 leading-relaxed">{toast.message}</p>}
             </div>
             <button onClick={() => removeToast(toast.id)} className="text-slate-400 hover:text-slate-600">
                 <X size={16} />
             </button>
          </div>
        ))}
      </div>
    </ToastContext.Provider>
  );
};

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