/**
 * ToastContext.tsx
 * Sistema minimalista de Toast Notifications.
 */

import { createContext, useContext, useState, useCallback, type ReactNode } from 'react';
import { createPortal } from 'react-dom';
import styles from './Toast.module.css';

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

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

interface ToastContextValue {
  addToast: (message: string, type?: ToastType) => void;
}

const ToastContext = createContext<ToastContextValue | null>(null);

export function ToastProvider({ children }: { children: ReactNode }) {
  const [toasts, setToasts] = useState<ToastData[]>([]);

  const addToast = useCallback((message: string, type: ToastType = 'info') => {
    const id = Math.random().toString(36).substring(2, 9);
    setToasts((prev) => [...prev, { id, message, type }]);

    // Remove automaticamente após 4 segundos
    setTimeout(() => {
      setToasts((prev) => prev.filter((t) => t.id !== id));
    }, 4000);
  }, []);

  const removeToast = (id: string) => {
    setToasts((prev) => prev.filter((t) => t.id !== id));
  };

  return (
    <ToastContext.Provider value={{ addToast }}>
      {children}
      
      {/* Portal renderiza os toasts no final do <body> */}
      {createPortal(
        <div className={styles.toastContainer}>
          {toasts.map((toast) => (
            <div key={toast.id} className={`${styles.toast} ${styles[toast.type]}`}>
              <span>{toast.message}</span>
              <button
                className={styles.closeBtn}
                onClick={() => removeToast(toast.id)}
                aria-label="Fechar"
              >
                &times;
              </button>
            </div>
          ))}
        </div>,
        document.body
      )}
    </ToastContext.Provider>
  );
}

export function useToast() {
  const ctx = useContext(ToastContext);
  if (!ctx) throw new Error('useToast deve ser usado dentro do ToastProvider');
  return ctx;
}