import { useState, useCallback, useRef, createContext, useContext } from "react";
import type { ReactNode } from "react";
import React from "react";

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

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

interface ToastContextValue {
  toasts: Toast[];
  addToast: (message: string, type?: ToastType) => void;
  removeToast: (id: number) => void;
}

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

export function ToastProvider({ children }: { children: ReactNode }) {
  const [toasts, setToasts] = useState<Toast[]>([]);
  const nextId = useRef(0);

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

  const addToast = useCallback((message: string, type: ToastType = "info") => {
    const id = nextId.current++;
    setToasts((prev) => [...prev, { id, message, type }]);
    setTimeout(() => removeToast(id), 4000);
  }, [removeToast]);

  return React.createElement(ToastContext.Provider, { value: { toasts, addToast, removeToast } }, children);
}

export function useToast(): ToastContextValue {
  const ctx = useContext(ToastContext);
  if (!ctx) throw new Error("useToast must be used within ToastProvider");
  return ctx;
}