import axios from "axios";
import { API_BASE_URL } from "../config";

const api = axios.create({
  baseURL: API_BASE_URL,
  headers: {
    "Content-Type": "application/json",
  },
});

api.interceptors.request.use((config => {
  const token = localStorage.getItem("token");
  if (token) {
    config.headers["Authorization"] = `Bearer ${token}`;
  }
  return config;
}));

api.interceptors.response.use(
  response => response,
  error => {
    const payload = error.response?.data;
    const normalizedMessage = payload?.error?.message || payload?.message;

    if (payload?.error?.message && payload.message === undefined) {
      payload.message = payload.error.message;
    }

    if (error.response?.status === 401 &&
      normalizedMessage === "Invalid or expired token") {
      localStorage.removeItem("token");
      window.location.href = "/login";
      alert("Your session has expired. Please log in again.");
    }
    return Promise.reject(error);
  }
);

export default api;