import axios from 'axios';
import toast from 'react-hot-toast';

export const Q = 500000; // QuotaPerUnit — single source of truth

const api = axios.create({
  baseURL: '',
  timeout: 30000,
  withCredentials: true, // CRITICAL: send session cookies on every request
  headers: { 'Content-Type': 'application/json' },
});

// Attach New-Api-User header (required by backend auth middleware)
api.interceptors.request.use((config) => {
  const userId = localStorage.getItem('dist_user_id');
  if (userId) {
    config.headers['New-Api-User'] = userId;
  }
  return config;
});

// Global error handler
api.interceptors.response.use(
  (res) => {
    // Handle success:false responses with user-visible errors
    if (res.data && res.data.success === false && res.data.message) {
      toast.error(res.data.message);
    }
    return res;
  },
  (err) => {
    const msg = err.response?.data?.message || err.message || 'Request failed';
    if (err.response?.status === 401) {
      localStorage.removeItem('dist_user_id');
      // Emit event so AuthContext can clear React state
      window.dispatchEvent(new Event('auth:logout'));
      toast.error('Session expired, please log in again');
    } else {
      toast.error(msg);
    }
    return Promise.reject(err);
  }
);

// ===== Public =====
export const getSiteInfo = () => api.get('/api/dist/site/info');
export const getSiteModels = () => api.get('/api/dist/site/models');
export const getSitePricing = () => api.get('/api/dist/site/pricing');
export const getSitePackages = () => api.get('/api/dist/site/packages');

// ===== Auth =====
export const register = (data) => api.post('/api/dist/user/register', data);
export const login = (data) => api.post('/api/dist/user/login', data);
export const logout = () => api.post('/api/dist/user/logout');

// ===== User =====
export const getUserSelf = () => api.get('/api/dist/user/self');
export const getUserUsage = () => api.get('/api/dist/user/usage');

// ===== Tokens =====
export const getTokens = () => api.get('/api/dist/token/list');
export const createToken = (data) => api.post('/api/dist/token/create', data);
export const updateToken = (id, data) => api.put(`/api/dist/token/${id}`, data);
export const deleteToken = (id) => api.delete(`/api/dist/token/${id}`);

// ===== Purchase =====
export const redeemCode = (key) => api.post('/api/dist/topup/redeem', { key }); // backend field is "key"
export const subscribePackage = (packageId) => api.post('/api/dist/package/subscribe', { package_id: packageId });

// ===== Online Topup =====
export const getTopupInfo = () => api.get('/api/dist/topup/info');
export const calculateAmount = (data) => api.post('/api/dist/topup/amount', data);
export const createEpayOrder = (data) => api.post('/api/dist/topup/pay', data);
export const createStripeOrder = (data) => api.post('/api/dist/topup/stripe/pay', data);
export const createCreemOrder = (data) => api.post('/api/dist/topup/creem/pay', data);
export const createCryptoOrder = (data) => api.post('/api/dist/topup/crypto/pay', data);
export const getCryptoOrderStatus = (tradeNo) => api.get(`/api/dist/topup/crypto/status?trade_no=${tradeNo}`);
export const getTopupHistory = (params) => api.get('/api/dist/topup/history', { params });

// ===== Helpers =====
export const quotaToDollar = (quota) => (quota / Q).toFixed(4);
export const quotaToDollar6 = (quota) => (quota / Q).toFixed(6);

export default api;