package wx

import (
	"bytes"
	"crypto/tls"
	"crypto/x509"
	"encoding/xml"
	"fmt"
	"io/ioutil"
	"net/http"
)

type cdata string

func (c cdata) MarshalXML(e *xml.Encoder, start xml.StartElement) error {
	return e.EncodeElement(struct {
		string `xml:",cdata"`
	}{string(c)}, start)
}

var _tlsConfig *tls.Config

//var WxClient = NewClient()

func getTLSConfig() (*tls.Config, error) {
	if _tlsConfig != nil {
		return _tlsConfig, nil
	}
	// load cert
	cert, err := tls.LoadX509KeyPair(WxCertPath, WxKeyPath)
	if err != nil {
		return nil, err
	}
	// load root ca
	caData, err := ioutil.ReadFile(WxCaPath)
	if err != nil {
		return nil, err
	}
	pool := x509.NewCertPool()
	pool.AppendCertsFromPEM(caData)
	_tlsConfig = &tls.Config{
		Certificates: []tls.Certificate{cert},
		RootCAs:      pool,
	}
	return _tlsConfig, nil
}

type Client struct {
	AppId        string
	MchId        string
	secureClient *http.Client
}

func (w *Client) Post(url string, xmlRes []byte) (*http.Response, error) {
	return w.secureClient.Post(url, "application/xml", bytes.NewBuffer(xmlRes))
}

// ======= 支付回调
func (w *Client) Callback() {

}

// ======= 统一下单
func (w *Client) UnifiedOrder(param *UnifiedOrderParam) (*UnifiedOrderResult, error) {
	param.Appid = w.AppId
	param.MchId = w.MchId
	xmlParam, err := xml.MarshalIndent(param, "", "")
	if err != nil {
		return nil, err
	}
	resp, err := w.Post(UnifiedOrderURL, xmlParam)
	if err != nil {
		return nil, err
	}

	body, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		return nil, err
	}
	res := new(UnifiedOrderResult)
	err = xml.Unmarshal(body, res)
	if err != nil {
		return nil, err
	}
	if res.ReturnCode != CODE_SUCCESS {
		return res, fmt.Errorf("network error, retrun_code: %v and return_msg: %v", res.ReturnCode, res.ReturnMsg)
	}
	if res.ResultCode != CODE_SUCCESS {
		return res, fmt.Errorf("trade error, err_code: %v and err_code_des: %v", res.ErrCode, res.ErrCodeDes)
	}

	return res, nil
}

// ======= 查询订单
func (w *Client) QueryOrder(param *QueryOrderParam) (*QueryOrderResult, error) {
	param.Appid = w.AppId
	param.MchId = w.MchId
	xmlParam, err := xml.MarshalIndent(param, "", "")
	if err != nil {
		return nil, err
	}
	resp, err := w.Post(QueryOrderURL, xmlParam)
	if err != nil {
		return nil, err
	}
	body, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		return nil, err
	}
	res := new(QueryOrderResult)
	err = xml.Unmarshal(body, res)
	if err != nil {
		return nil, err
	}
	if res.ReturnCode != CODE_SUCCESS {
		return res, fmt.Errorf("network error, return_code: %v and return_msg: %v", res.ReturnCode, res.ReturnMsg)
	}
	if res.ResultCode != CODE_SUCCESS {
		return res, fmt.Errorf("trade error, err_code: %v and err_code_des: %v", res.ErrCode, res.ErrCodeDes)
	}
	return res, nil
}

// ======= 关闭订单
func (w *Client) CloseOrder(param *CloseOrderParam) (*CloseOrderResult, error) {
	param.Appid = w.AppId
	param.MchId = w.MchId
	xmlParam, err := xml.MarshalIndent(param, "", "")
	if err != nil {
		return nil, err
	}
	resp, err := w.Post(CloseOrderURL, xmlParam)
	if err != nil {
		return nil, err
	}
	body, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		return nil, err
	}
	res := new(CloseOrderResult)
	err = xml.Unmarshal(body, res)
	if err != nil {
		return nil, err
	}
	if res.ReturnCode != CODE_SUCCESS {
		return res, fmt.Errorf("network error, return_code: %v and return_msg: %v", res.ReturnCode, res.ReturnMsg)
	}
	if res.ResultCode != CODE_SUCCESS {
		return res, fmt.Errorf("trade error, err_code: %v and err_code_des: %v", res.ErrCode, res.ErrCodeDes)
	}

	return res, nil
}

// ======= 申请退款
func (w *Client) Refund(param *RefundParam) (*RefundResult, error) {
	param.Appid = w.AppId
	param.MchId = w.MchId
	xmlParam, err := xml.MarshalIndent(param, "", "")
	if err != nil {
		return nil, err
	}
	resp, err := w.Post(RefundURL, xmlParam)
	if err != nil {
		return nil, err
	}
	body, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		return nil, err
	}
	res := new(RefundResult)
	err = xml.Unmarshal(body, res)
	if err != nil {
		return nil, err
	}
	if res.ReturnCode != CODE_SUCCESS {
		return res, fmt.Errorf("network error, return_code: %v and return_msg: %v", res.ReturnCode, res.ReturnMsg)
	}
	if res.ResultCode != CODE_SUCCESS {
		return res, fmt.Errorf("trade error, err_code: %v and err_code_des: %v", res.ErrCode, res.ErrCodeDes)
	}

	return nil, nil
}

//  ======= 查询退款
func (w *Client) RefundQuery(param *RefundQueryParam) (*RefundQueryResult, error) {
	param.Appid = w.AppId
	param.MchId = w.MchId
	xmlParam, err := xml.MarshalIndent(param, "", "")
	if err != nil {
		return nil, err
	}
	resp, err := w.Post(RefundQueryURL, xmlParam)
	if err != nil {
		return nil, err
	}
	body, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		return nil, err
	}
	res := new(RefundQueryResult)
	err = xml.Unmarshal(body, res)
	if err != nil {
		return nil, err
	}
	if res.ReturnCode != CODE_SUCCESS {
		return res, fmt.Errorf("network error, return_code: %v and return_msg: %v", res.ReturnCode, res.ReturnMsg)
	}
	if res.ResultCode != CODE_SUCCESS {
		return res, fmt.Errorf("trade error, err_code: %v and err_code_des: %v", res.ErrCode, res.ErrCodeDes)
	}
	return res, nil

}

// 支付结果通知
// 支付给用户零钱

// 公众号发送红包
func (w *Client) SendRedPack(param *RedPackParam) (*RedPackResult, error) {
	param.Appid = w.AppId
	param.MchId = w.MchId
	xmlParam, err := xml.MarshalIndent(param, "", "")
	if err != nil {
		return nil, err
	}
	resp, err := w.Post(SendRedPackURL, xmlParam)
	if err != nil {
		return nil, err
	}
	body, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		return nil, err
	}
	res := new(RedPackResult)
	err = xml.Unmarshal(body, res)
	if err != nil {
		return nil, err
	}
	if res.ReturnCode != CODE_SUCCESS {
		return res, fmt.Errorf("network error, return_code: %v and return_msg: %v", res.ReturnCode, res.ReturnMsg)
	}
	if res.ResultCode != CODE_SUCCESS {
		return res, fmt.Errorf("trade error, err_code: %v and err_code_des: %v", res.ErrCode, res.ErrCodeDes)
	}
	return res, nil
}