package exchange

import (
	"crypto/md5"
	"encoding/hex"
	"encoding/json"
	"fmt"
	"github.com/demdxx/gocast"
	"reflect"
	"sort"
	"strings"
	"time"
)

// doc: https://dsgxajqzhgq3.sg.larksuite.com/wiki/Flk1wnbUPiSucBk47TClBnC4g7m

// 获取充值入口

func GetTransferUri(customParams string, args ...string) string {
	uri := fmt.Sprintf("/zh-CN/application-center/transfer?appid=%s&custom_param=%s&redirect_uri=%s",
		conf().Appid, customParams, conf().RedirectUrl)
	if len(args) > 0 {
		uri = fmt.Sprintf("/zh-CN/application-center/transfer?appid=%s&custom_param=%s&redirect_uri=%s",
			conf().Appid, customParams, strings.Join(args, ""))
	}
	return uri
}

// /v1/act/public/application/third/transfer
// /v1/act/public/application/third/transfer?accessToken={ACCESSTOKEN}&openId={OPENID}
// accessToken openId 至少一个不为空,两者都不为空时,accesToken优先有效。
// 转出

type TransferOutReq struct {
	Currency  string `json:"currency,omitempty"` // 必填
	Amount    string `json:"amount,omitempty"`   // 必填
	OrderId   string `json:"orderId,omitempty"`  // 必填
	AppId     string `json:"appId,omitempty"`
	Timestamp string `json:"timestamp,omitempty"`
	Sign      string `json:"sign,omitempty"`
}

type TransferOutResp struct {
	Code int         `json:"code"`
	Msg  string      `json:"msg"`
	Data interface{} `json:"data"`
}

func TransferOut(openId string, req *TransferOutReq) (*TransferOutResp, error) {
	uri := fmt.Sprintf("/v1/act/public/application/third/transfer-apply?openId=%s",
		openId)
	url := ToPath(conf().RootUrl, uri)
	req.Timestamp = gocast.ToString(time.Now().UnixMilli())
	req.AppId = conf().Appid
	reqMap, err := structToJSONMap(req)
	if err != nil {
		return nil, err
	}
	sign := signMd5(reqMap)
	req.Sign = sign
	data, _ := json.Marshal(&req)
	return post[TransferOutResp](url, data)
}

// 回调处理（充值 提现）

const (
	TransferUserToApp = "user_to_application"
	TransferAppToUser = "application_to_user"
)

const (
	ExchangeRwStatusRechargeSuccess = 0
	ExchangeRwStatusWithdrawSuccess = 1
	ExchangeRwStatusWithdrawFail    = 2
)

type TransferCallbackReq struct {
	Currency    string `json:"currency,omitempty"`
	Amount      string `json:"amount,omitempty"`
	OrderId     string `json:"orderId,omitempty"`
	OpenId      string `json:"openId,omitempty"`
	CreateTime  int64  `json:"createTime,omitempty"`
	Type        string `json:"type,omitempty"` // user_to_application application_to_user
	AppId       string `json:"appId,omitempty"`
	CustomParam string `json:"customParam"`
	Status      int    `json:"status,omitempty"`
	Sign        string `json:"sign,omitempty"`
}

type CheckTransferCallbackReq struct {
	Currency    string `json:"currency,omitempty"`
	Amount      string `json:"amount,omitempty"`
	OrderId     string `json:"orderId,omitempty"`
	OpenId      string `json:"openId,omitempty"`
	CreateTime  string `json:"createTime"`
	Type        string `json:"type"` // user_to_application application_to_user
	AppId       string `json:"appId,omitempty"`
	CustomParam string `json:"customParam"`
	Status      int    `json:"status,omitempty"`
	Sign        string `json:"sign,omitempty"`
}

// 加密检查

func SignCheck(req *TransferCallbackReq) bool {
	sign := req.Sign
	checkReq := &CheckTransferCallbackReq{
		Currency:    req.Currency,
		Amount:      req.Amount,
		OrderId:     req.OrderId,
		OpenId:      req.OpenId,
		CreateTime:  fmt.Sprintf("%d", req.CreateTime),
		Type:        req.Type,
		AppId:       req.AppId,
		Status:      req.Status,
		CustomParam: req.CustomParam,
	}
	reqMap, err := structToJSONMap(checkReq)
	if err != nil {
		return false
	}
	return sign == signMd5(reqMap)
}

func SignCheckMap(req map[string]interface{}, sign string) bool {
	return sign == signMd5(req)
}

// 将结构体转换为 map
func beanToMap(req interface{}) map[string]interface{} {
	result := make(map[string]interface{})
	value := reflect.ValueOf(req)

	for i := 0; i < value.NumField(); i++ {
		field := value.Type().Field(i)
		result[field.Name] = value.Field(i).Interface()
	}
	return result
}

// 计算MD5签名 -- 不实用

func CalculateSign(req TransferCallbackReq) string {
	// 实体转map
	hashMap := beanToMap(req)

	// 将HashMap转换为TreeMap（按键排序）
	treeMap := make(map[string]string)
	for key, value := range hashMap {
		if value != nil {
			treeMap[key] = fmt.Sprintf("%v", value)
		}
	}

	// 排序键
	keys := make([]string, 0, len(treeMap))
	for key := range treeMap {
		keys = append(keys, key)
	}
	sort.Strings(keys)

	// 拼接字符串
	var stringBuilder strings.Builder
	for _, key := range keys {
		value := treeMap[key]
		if value != "" && key != "sign" { // 过滤空值和 "sign" 字段
			stringBuilder.WriteString(key)
			stringBuilder.WriteString(value)
		}
	}
	// appSecret拼接
	stringBuilder.WriteString(conf().Secret)
	// md5加密
	hash := md5.Sum([]byte(stringBuilder.String()))
	return hex.EncodeToString(hash[:])
}