package dingdingapi

import (
	"crypto/sha1"
	"encoding/base64"
	"fmt"
	"sort"
	"strings"
	"time"

	"git.rosy.net.cn/baseapi/utils"
)

const (
	CBTagUserAddOrg    = "user_add_org"
	CBTagUserModifyOrg = "user_modify_org"
	CBTagUserLeaveOrg  = "user_leave_org"
)

const (
	KeyMsgSignature = "msg_signature"
)

func (a *API) PackCallbackResult(result string) (resultMap map[string]interface{}) {
	encryptedResult, err := a.Encrypt(result)
	if err == nil {
		resultMap = map[string]interface{}{
			"encrypt":   encryptedResult,
			"timeStamp": utils.Int64ToStr(time.Now().Unix()),
			"nonce":     utils.GetUUID(),
		}
		resultMap["msg_signature"] = a.calculateCallbackSign(resultMap)
	}
	return resultMap
}

func (a *API) calculateCallbackSign(data map[string]interface{}) (sign string) {
	strList := []string{
		a.callbackToken,
	}
	for k, v := range data {
		if k != KeyMsgSignature {
			strList = append(strList, v.(string))
		}
	}
	sort.Sort(sort.StringSlice(strList))
	return fmt.Sprintf("%x", sha1.Sum([]byte(strings.Join(strList, ""))))
}

func (a *API) Encrypt(msg string) (encryptedMsg string, err error) {
	binResult, err := utils.AESCBCEncpryt([]byte(msg), a.callbackAesKey, a.callbackAesKey[:16])
	encryptedMsg = base64.StdEncoding.EncodeToString(binResult)
	return encryptedMsg, err
}

func (a *API) Decrypt(msg string) (decryptedMsg string, err error) {
	binMsg, err := base64.StdEncoding.DecodeString(msg)
	if err == nil {
		binResult, err2 := utils.AESCBCDecpryt(binMsg, a.callbackAesKey, a.callbackAesKey[:16])
		if err = err2; err == nil {
			decryptedMsg = string(binResult)
		}
	}
	return decryptedMsg, err
}

func (a *API) RegisterCallback(callbackTagList []string, token, aesKey, urlStr string) (err error) {
	if len(callbackTagList) > 0 { // 为0做测试用
		_, err = a.AccessAPI("call_back/register_call_back", nil, map[string]interface{}{
			"call_back_tag": callbackTagList,
			"token":         token,
			"aes_key":       aesKey,
			"url":           urlStr,
		})
	}
	if err == nil {
		a.callbackToken = token
		a.callbackAesKey, _ = base64.StdEncoding.DecodeString(aesKey + "=")
	}
	return err
}