import crypto from "crypto";
import axios from "axios";
import dotenv from 'dotenv';

import path from "path";
import { fileURLToPath } from "url";

import { getData } from "../libs/cache.js";
import Logs from "../libs/logs.js";

dotenv.config();

const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);

const PARTNER_DATA_FILE = path.join(__dirname, '../data/partner.json');

/**
 * Partner API environment variables
 */
const PARTNER_API_BASE = 'https://dev.api.ppai.win/api/p/gate';
const { PARTNER_APP_ID, PARTNER_APP_KEY } = process.env;

const PARTNER_DATA = {};

/**
 * 加载本地数据
 */
const loadLocalData = async () => {
  const data = await getData(PARTNER_DATA_FILE);
  Object.assign(PARTNER_DATA, data);
}
loadLocalData().catch(error => {
  Logs.out('not load partner data', error.message);
});

/**
 * 生成SHA256
 */
const generateSHA256 = (message) => {
  return crypto.createHash('sha256').update(message).digest('hex');
}

/**
 * 生成随机 nonce
 */
const generateNonce = () => {
  return Math.random().toString(36).substring(2, 15) + Math.random().toString(36).substring(2, 15);
}

/**
 * 生成签名
 */
const generateSignature = (appKey, action, timestamp, nonce) => {
  return generateSHA256(`${appKey}${action}${timestamp}${nonce}`);
}

/**
 * 获取时间戳 秒级
 */
const getTimestamp = () => {
  return Math.floor(Date.now() / 1000);
}

/**
 * 时间窗口校验
 */
const isTimestampValid = (timestamp, window=300) => {
  const now = getTimestamp();
  return Math.abs(now - timestamp) <= window;
}

/**
 * 请求Partner数据接口
 */
export const requestData = async (action, data) => {
  const timestamp = getTimestamp();
  const nonce = generateNonce();
  const sign = generateSignature(PARTNER_APP_KEY, action, timestamp, nonce);
  const appid = PARTNER_APP_ID;
  const requestData = { action, appid, nonce, sign, timestamp };
  if (Object.keys(data).length > 0) {
    requestData.params = data;
  }
  return axios.post(PARTNER_API_BASE, requestData).then(res => res.data);
}

export const updateSolutions = async (solutions) => {
  if (process.env.NODE_ENV == 'development') {
    return Promise.resolve({ message: 'development mode' });
  }
  return requestData('opps.soccer', solutions);
}

/**
 * 接收Partner数据
 */
export const receivePartnerData = async (data) => {
  const { action, appid, nonce, sign, timestamp, params } = data;
  if (!isTimestampValid(timestamp)) {
    return Promise.reject(new Error('timestamp invalid'));
  }
  const partnerData = PARTNER_DATA[appid];
  if (!partnerData) {
    return Promise.reject(new Error('appid invalid'));
  }
  const newSign = generateSignature(partnerData.appkey, action, timestamp, nonce);
  if (newSign !== sign) {
    return Promise.reject(new Error('sign invalid'));
  }
  return Promise.resolve({ action, params });
}

export default { updateSolutions, receivePartnerData };