import Taro from '@tarojs/taro';

function resolveApiBase(): string {
  const origin =
    typeof TARO_APP_API_ORIGIN !== 'undefined' && TARO_APP_API_ORIGIN
      ? TARO_APP_API_ORIGIN
      : process.env.TARO_ENV === 'h5'
        ? 'http://localhost:3010'
        : '';
  if (origin) {
    return `${origin.replace(/\/$/, '')}/api/v1`;
  }
  return '/api/v1';
}

export const API_BASE = resolveApiBase();
const TOKEN_KEY = 'hq_access_token';
const CLIENT_APP = 'HQ_WEB';

export function getToken(): string {
  try {
    return Taro.getStorageSync(TOKEN_KEY) || '';
  } catch {
    return '';
  }
}

export function saveToken(token: string) {
  Taro.setStorageSync(TOKEN_KEY, token);
}

export function clearToken() {
  Taro.removeStorageSync(TOKEN_KEY);
}

export function isLoggedIn(): boolean {
  return !!getToken();
}

export function redirectToLogin() {
  Taro.reLaunch({ url: '/pages/login/index' });
}

export function logout() {
  clearToken();
  redirectToLogin();
}

type ReqOptions = {
  method?: 'GET' | 'POST' | 'PUT' | 'DELETE' | 'PATCH';
  data?: Record<string, unknown> | unknown;
  auth?: boolean;
};

function parseBody(data: unknown): { code?: number; message?: string } {
  if (data && typeof data === 'object') {
    return data as { code?: number; message?: string };
  }
  return {};
}

/** 统一请求：注入 X-Client-App + Bearer，解包 { code, message, data }，401 自动回登录 */
export async function request<T = unknown>(path: string, options: ReqOptions = {}): Promise<T> {
  const header: Record<string, string> = {
    'Content-Type': 'application/json',
    'X-Client-App': CLIENT_APP,
  };
  const token = getToken();
  if (token) header.Authorization = `Bearer ${token}`;

  const res = await Taro.request({
    url: `${API_BASE}${path}`,
    method: options.method ?? 'GET',
    data: options.data as Record<string, unknown>,
    header,
  });

  const status = res.statusCode;
  const body = parseBody(res.data);

  if (status === 401 || body?.code === 401) {
    clearToken();
    redirectToLogin();
    throw new Error(body?.message || '登录已过期，请重新登录');
  }
  if (status === 404 && body.code === undefined) {
    throw new Error('接口不可达，请确认 API 服务已启动');
  }
  if (status >= 400 || body.code !== 0) {
    throw new Error(body?.message || `请求失败(${status})`);
  }
  return (res.data as { data: T }).data;
}

export type Paginated<T> = { items: T[]; total: number };

export function toast(title: string, icon: 'success' | 'error' | 'none' = 'none') {
  Taro.showToast({ title, icon, duration: 1800 });
}