package wechat

import (
	"crypto/aes"
	"crypto/cipher"
	"encoding/base64"
	"encoding/json"
	"strings"

	"git.chuangxin1.com/cx/myth/util"
)

// DecryptAES256GCM 使用 AEAD_AES_256_GCM 算法进行解密
func DecryptAES256GCM(aesKey, associatedData, nonce, ciphertext string) (dataBytes []byte, err error) {
	var (
		decodedCiphertext []byte
		c                 cipher.Block
		gcm               cipher.AEAD
	)
	decodedCiphertext, err = base64.StdEncoding.DecodeString(ciphertext)
	if err != nil {
		return
	}
	c, err = aes.NewCipher([]byte(aesKey))
	if err != nil {
		return
	}
	gcm, err = cipher.NewGCM(c)
	if err != nil {
		return
	}
	dataBytes, err = gcm.Open(nil, []byte(nonce), decodedCiphertext, []byte(associatedData))
	return
}

// Unmarshal 解析结构
func (r *PayResultNotifyV3) Unmarshal(body []byte) (err error) {
	err = json.Unmarshal(body, &r)
	return
}

// IsEntranceStateChange 是否微信支付分停车 状态变更通知
func (r *PayResultNotifyV3) IsEntranceStateChange() bool {
	return strings.Compare(r.EventType, "VEHICLE.ENTRANCE_STATE_CHANGE") == 0
}

// IsTransactionSuccess 是否支付到账通知
func (r *PayResultNotifyV3) IsTransactionSuccess() bool {
	return strings.Compare(r.EventType, "TRANSACTION.SUCCESS") == 0
}

// IsTradeSuccess 是否支付成功
func (r *PayOrderInfoV3) IsTradeSuccess() bool {
	return strings.Compare(r.TradeState, "SUCCESS") == 0
}

// Unmarshal 解析结构
func (r *PayScoreParkingNotifyV3Result) Unmarshal(body []byte) (err error) {
	err = json.Unmarshal(body, &r)
	return
}

// Unmarshal 解析结构
func (r *PayScoreParkingNotifyV3Result) String() (s string) {
	bs, _ := json.Marshal(r)
	s = util.BytesToString(bs)
	return
}

// Unmarshal 解析结构
func (r *PayRefundInfoV3) Unmarshal(body []byte) (err error) {
	err = json.Unmarshal(body, &r)
	return
}

// Unmarshal 解析结构
func (r *PayOrderInfoV3) Unmarshal(body []byte) (err error) {
	err = json.Unmarshal(body, &r)
	return
}