import { post } from './apiClient';
import type { LoginRequest, LoginResponse, User } from '../types/auth';

const TOKEN_KEY = 'snp_access_token';
const REFRESH_TOKEN_KEY = 'snp_refresh_token';
const USER_KEY = 'snp_user';

export const login = async (req: LoginRequest): Promise<LoginResponse> => {
  const response = await post<LoginResponse>('/auth/login', req);

  if (!response.success || !response.data) {
    throw new Error(response.message || '로그인에 실패했습니다.');
  }

  const data = response.data;
  localStorage.setItem(TOKEN_KEY, data.accessToken);
  localStorage.setItem(REFRESH_TOKEN_KEY, data.refreshToken);
  localStorage.setItem(USER_KEY, JSON.stringify({
    loginId: data.loginId,
    userName: data.userName,
    role: data.role,
  }));

  return data;
};

export const logout = async (): Promise<void> => {
  try {
    await post('/auth/logout');
  } finally {
    localStorage.removeItem(TOKEN_KEY);
    localStorage.removeItem(REFRESH_TOKEN_KEY);
    localStorage.removeItem(USER_KEY);
  }
};

export const refreshToken = async (): Promise<void> => {
  const storedRefreshToken = localStorage.getItem(REFRESH_TOKEN_KEY);
  if (!storedRefreshToken) {
    throw new Error('No refresh token available');
  }

  const response = await post<{ accessToken: string }>('/auth/refresh', {
    refreshToken: storedRefreshToken,
  });

  if (!response.success || !response.data) {
    throw new Error('Token refresh failed');
  }

  localStorage.setItem(TOKEN_KEY, response.data.accessToken);
};

export const getStoredUser = (): User | null => {
  const userStr = localStorage.getItem(USER_KEY);
  if (!userStr) return null;

  try {
    return JSON.parse(userStr) as User;
  } catch {
    return null;
  }
};

export const getAccessToken = (): string | null => {
  return localStorage.getItem(TOKEN_KEY);
};