/**
 * 自定义公共函数包
 * 这里可以写你自己的公共函数
 */
var CryptoJS = require("crypto-js");
const crypto = require('crypto');
var pubFun = {};
/**
 * 公共函数写法示例
 * 调用示例：
 * pubFun.test();
 * 或
 * vk.myfn.test();
 */
pubFun.test = function(path) {
	// 此处可以直接使用 vk 实例
	let timeStr = vk.pubfn.timeFormat(new Date(), "yyyy-MM-dd hh:mm:ss");
	// 逻辑
	// ...
	// 逻辑	
	return {
		timeStr,
		msg: "这是公共函数test的返回"
	}
}

const url = 'http://test.api.fabigbig.com:8888/api'
const app_id = 405942
const app_secret = 'ODDW0vm9FvDj2RYQRmoryVnH'

const getFadadaSign = function(api, params, timestamp) {
	const copyParams = {
		...params
	}
	//1. A.将参与摘要计算的业务参数按字典升序排列
	let computeKeys = Object.keys(params)

	var sortedParams = computeKeys.sort().reduce((acc, curr, index) => {
		acc += params[curr];
		return acc;
	}, '');

	// 1.B.将 app_secret 附加到字符串串前
	let str1 = app_secret + sortedParams
	console.log('sortedParams: ',sortedParams);
	if (api == 'generate_contract.api') {
		str1 = app_secret + params.template_id + params.contract_id
	} else if (api == 'uploaddocs.api') {
		str1 = app_secret + params.contract_id
	} else if (api == 'extsign.api') {
		str1 = app_secret + params.customer_id
	}


	// 步骤 2.对得到的字符串进⾏SHA1 加密
	const sha1_1 = CryptoJS.SHA1(str1).toString().toUpperCase()
	console.log('sha1_1: ', sha1_1);
	// 步骤 3.计算 timestamp的MD5值，并和app_id，步骤 2 中得到的字符串拼接得到新的字符串
	let timestampMd5 = ''
	if (api == 'extsign.api') {
		timestampMd5 = CryptoJS.MD5(params.transaction_id + timestamp).toString().toUpperCase()
	} else {
		timestampMd5 = CryptoJS.MD5(timestamp).toString().toUpperCase()
	}

	let str2 = app_id + timestampMd5 + sha1_1
	if (api == 'generate_contract.api') {
		str2 += params.parameter_map
	} else if (api == 'extsign.api') {

	}

	// 步骤 4.对步骤3中得到的字符串进行SHA1 加密
	const str3 = CryptoJS.SHA1(str2).toString().toUpperCase()
	// 步骤 5.对步骤 4 中得到的字符串进⾏base64 加密
	var wordArray = CryptoJS.enc.Utf8.parse(str3);
	const msg_digest = CryptoJS.enc.Base64.stringify(wordArray);

	return msg_digest;

}
pubFun.getFadadaSign = getFadadaSign

/**
 * 给法大大发请求

 * @param {Object} api
 * @param {Object} params
 */
pubFun.fadada = async function(api, params) {



	const timestamp = vk.pubfn.timeFormat(new Date(), "yyyyMMddhhmmss");
	const msg_digest = getFadadaSign(api, params, timestamp)

	const res = await vk.request({
		url: url + '/' + api,
		method: "POST",
		header: {
			"content-type": "application/x-www-form-urlencoded;charset=UTF-8",
		},
		data: {
			app_id: app_id,
			timestamp,
			v: '2.0',
			msg_digest,
			...params
		}
	});
	console.log('res: ', res);
	return res;
}

function buildQueryString(params) {
	let queryString = '';
	for (const key in params) {
		if (params.hasOwnProperty(key)) {
			if (queryString.length > 0) {
				queryString += '&';
			}
			queryString += `${encodeURIComponent(key)}=${encodeURIComponent(params[key])}`;
		}
	}
	return queryString;
}

/**
 * 给法大大发请求

 * @param {Object} api
 * @param {Object} params
 */
pubFun.fadadaUrl = function(api, params) {



	const timestamp = vk.pubfn.timeFormat(new Date(), "yyyyMMddhhmmss");
	const msg_digest = getFadadaSign(api, params, timestamp)

	const queryParams = buildQueryString({
		app_id: app_id,
		timestamp,
		v: '2.0',
		msg_digest,
		...params
	});
	const fullUrl = `${url}/${api}?${queryParams}`;


	return fullUrl;
}

pubFun.base64ToFile = function(base64, fileName) {
	
}

module.exports = pubFun;