/*
   Copyright 2020 XiaochengTech

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
*/

package wxpay

import (
	"encoding/xml"
	"errors"
	"gitee.com/xiaochengtech/wechat/util"
)

// 获取沙盒的签名
func (c *Client) sandboxSign(nonceStr string, signType string) (key string, err error) {
	body := make(map[string]interface{})
	body["mch_id"] = c.Config.MchId
	body["nonce_str"] = nonceStr
	// 计算沙箱参数Sign
	sanboxSign := c.localSign(body, signType, c.apiKey)
	// 沙箱环境：获取key后，重新计算Sign
	key, err = c.getSandBoxSignKey(nonceStr, sanboxSign)
	return
}

// (沙盒环境) 调用微信提供的接口获取验签密钥
func (c *Client) getSandBoxSignKey(nonceStr string, sign string) (key string, err error) {
	params := make(map[string]interface{})
	params["mch_id"] = c.Config.MchId
	params["nonce_str"] = nonceStr
	params["sign"] = sign
	paramXml := util.GenerateXml(params)
	bytes, err := util.HttpPostXml(c.URL("pay/getsignkey"), paramXml)
	if err != nil {
		return
	}
	var keyResponse getSignKeyResponse
	if err = xml.Unmarshal(bytes, &keyResponse); err != nil {
		return
	}
	if keyResponse.ReturnCode == ResponseFail {
		err = errors.New(keyResponse.ReturnMsg)
		return
	}
	key = keyResponse.SandboxSignkey
	return
}

// (沙盒环境) 获取验签密钥接口的返回值
type getSignKeyResponse struct {
	ResponseModel
	Retcode        string `xml:"retcode"`         // TODO 移除？
	MchId          string `xml:"mch_id"`          // 调用接口提交的商户号
	SandboxSignkey string `xml:"sandbox_signkey"` // 返回的沙盒密钥
}