frontend/src/services/api.ts

import axios from "axios";

const BASE_URL = import.meta.env.VITE_NODE_BASE_URL || "http://localhost:3000/api";


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

// Optional: Add response interceptor for global error handling
let isRefreshing = false;
let failedQueue: any[] = [];

const processQueue = (error: any, token: string | null = null) => {
  failedQueue.forEach((prom) => {
    if (error) {
      prom.reject(error);
    } else {
      prom.resolve(token);
    }
  });

  failedQueue = [];
};

api.interceptors.response.use(
  (response) => response,
  async (error) => {
    const originalRequest = error.config;

    console.log("Interceptor caught error:", {
      status: error.response?.status,
      data: error.response?.data,
      message: error.response?.data?.message
    });

    if (
      (error.response?.status === 401 ||
        (error.response?.status === 500 && error.response?.data?.message === 'jwt expired')) &&
      !originalRequest._retry
    ) {
      if (isRefreshing) {
        return new Promise(function (resolve, reject) {
          failedQueue.push({ resolve, reject });
        })
          .then(() => {
            return api(originalRequest);
          })
          .catch((err) => {
            return Promise.reject(err);
          });
      }

      originalRequest._retry = true;
      isRefreshing = true;

      try {
        await axios.get(`${BASE_URL}/user/refresh-token`, { withCredentials: true });

        processQueue(null, "refreshed");
        isRefreshing = false;
        return api(originalRequest);
      } catch (refreshError) {
        processQueue(refreshError, null);
        isRefreshing = false;
        localStorage.removeItem("user");
        window.location.href = "/login";
        return Promise.reject(refreshError);
      }
    }

    console.error("API Error:", error.response?.data?.message || error.message);
    return Promise.reject(error);
  }
);

export default api;