import axios, { type AxiosInstance } from "axios";

const STORAGE_KEY_ACCESS = "shop_access_token";
const STORAGE_KEY_REFRESH = "shop_refresh_token";

export function createApi(baseURL: string): AxiosInstance {
  // 10 min — LLM plan calls over many items on a local CPU can take several minutes.
  const api = axios.create({ baseURL, timeout: 600000 });

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

  api.interceptors.response.use(
    (r) => r,
    async (err) => {
      const original = err.config;
      if (err.response?.status === 401 && !original._retry) {
        const refresh = localStorage.getItem(STORAGE_KEY_REFRESH);
        if (refresh) {
          original._retry = true;
          try {
            const resp = await axios.post(`${baseURL}/api/auth/refresh`, {
              refresh_token: refresh,
            });
            localStorage.setItem(STORAGE_KEY_ACCESS, resp.data.access_token);
            localStorage.setItem(STORAGE_KEY_REFRESH, resp.data.refresh_token);
            original.headers.Authorization = `Bearer ${resp.data.access_token}`;
            return api(original);
          } catch {
            localStorage.removeItem(STORAGE_KEY_ACCESS);
            localStorage.removeItem(STORAGE_KEY_REFRESH);
          }
        }
      }
      throw err;
    }
  );

  return api;
}

export function saveTokens(access: string, refresh: string): void {
  localStorage.setItem(STORAGE_KEY_ACCESS, access);
  localStorage.setItem(STORAGE_KEY_REFRESH, refresh);
}

export function clearTokens(): void {
  localStorage.removeItem(STORAGE_KEY_ACCESS);
  localStorage.removeItem(STORAGE_KEY_REFRESH);
}

export function hasAccess(): boolean {
  return !!localStorage.getItem(STORAGE_KEY_ACCESS);
}