frontend/src/api/axios.js

import axios from "axios"

const api = axios.create({
  baseURL: window.location.hostname === "localhost" ? "http://localhost:8000" : "",
})

api.interceptors.request.use((config) => {
  const token = sessionStorage.getItem("access_token")
  if (token) {
    config.headers.Authorization = `Bearer ${token}`
  }
  return config
}, (error) => {
  return Promise.reject(error)
})

api.interceptors.response.use(
  (res) => res,
  async (error) => {
    const originalRequest = error.config
    if (error.response?.status === 401 && !originalRequest._retry) {
      originalRequest._retry = true
      const refresh = sessionStorage.getItem("refresh_token")
      
      if (!refresh) {
        sessionStorage.clear()
        window.location.href = "/login"
        return Promise.reject(error)
      }
      
      try {
        const baseURL = window.location.hostname === "localhost" ? "http://localhost:8000" : "";
        const { data } = await axios.post(`${baseURL}/auth/refresh`, {
          refresh_token: refresh,
        })
        sessionStorage.setItem("access_token", data.access_token)
        sessionStorage.setItem("refresh_token", data.refresh_token)
        originalRequest.headers.Authorization = `Bearer ${data.access_token}`
        return api(originalRequest)
      } catch (refreshError) {
        sessionStorage.clear()
        window.location.href = "/login"
        return Promise.reject(refreshError)
      }
    }
    return Promise.reject(error)
  }
)

export default api