client.ts

import axios, { type AxiosInstance } from "axios";
import { reissueAccessTokenApi } from "@/lib/api/auth";
import { isTokenExpired } from "@/lib/utils/jwtUtils";
import {
	loadAccessToken,
	loadRefreshToken,
	removeAccessToken,
	removeRefreshToken,
	saveAccessToken,
} from "@/lib/utils/localStorage";

const convertToBearer = (token: string) => `Bearer ${token}`;

const API_SERVER_URL = import.meta.env.VITE_API_SERVER_URL?.trim();

if (!API_SERVER_URL) {
	throw new Error("[admin] VITE_API_SERVER_URL is required. Configure it in your environment.");
}

export const axiosInstance: AxiosInstance = axios.create({
	baseURL: API_SERVER_URL,
	withCredentials: true,
});

axiosInstance.interceptors.request.use(
	async (config) => {
		const newConfig = { ...config };
		let accessToken: string | null = loadAccessToken();

		if (accessToken === null || isTokenExpired(accessToken)) {
			const refreshToken = loadRefreshToken();
			if (refreshToken === null || isTokenExpired(refreshToken)) {
				removeAccessToken();
				removeRefreshToken();
				return config;
			}

			await reissueAccessTokenApi(refreshToken)
				.then((res) => {
					accessToken = res.data.accessToken;
					saveAccessToken(accessToken);
				})
				.catch((err) => {
					removeAccessToken();
					removeRefreshToken();
					console.error("인증 토큰 갱신중 오류가 발생했습니다", err);
				});
		}

		if (accessToken !== null) {
			newConfig.headers.Authorization = convertToBearer(accessToken);
		}
		return newConfig;
	},
	(error) => Promise.reject(error),
);

axiosInstance.interceptors.response.use(
	(response) => response,
	async (error) => {
		const newError = { ...error };
		if (error.response?.status === 401 || error.response?.status === 403) {
			const refreshToken = loadRefreshToken();

			if (refreshToken === null || isTokenExpired(refreshToken)) {
				removeAccessToken();
				removeRefreshToken();
				throw newError;
			}

			try {
				const newAccessToken = await reissueAccessTokenApi(refreshToken).then((res) => res.data.accessToken);
				saveAccessToken(newAccessToken);

				if (error?.config.headers === undefined) {
					newError.config.headers = {};
				}
				newError.config.headers.Authorization = convertToBearer(newAccessToken);

				return await axios.request(newError.config);
			} catch (_err) {
				removeAccessToken();
				removeRefreshToken();
				throw Error("로그인이 필요합니다");
			}
		} else {
			throw newError;
		}
	},
);

export const publicAxiosInstance: AxiosInstance = axios.create({
	baseURL: API_SERVER_URL,
});