package ysqr

import (
	"encoding/json"
	"fmt"
	"strconv"
	"strings"

	"91porn-server/common/crypt"
)

type ActType string

const (
	Login ActType = "||"

	PFV = "pfv"
)

type LoginClaims struct {
	DevID string  `json:"devID"`
	T     ActType `json:"t"`
}

func sign(devID string, t ActType, secret string) string {
	j, _ := json.Marshal(LoginClaims{
		DevID: devID,
		T:     t,
	})
	sha256 := crypt.StrToHmacSha256(string(j), secret)
	if len(sha256) > 24 {
		return sha256[8:24]
	}
	return sha256
}

type Content struct {
	UID uint64
	T   ActType
	LoginClaims
}

// String pfv2505938||********
func (c Content) String(secret string) string {
	s := sign(c.DevID, c.T, secret)
	return fmt.Sprintf("%s%d%s%s", PFV, c.UID, string(c.T), s)
}

func GetUIDFromQrCnt(t ActType, qrCnt string) (uint64, error) {
	list := strings.Split(qrCnt, string(t))
	if len(list) != 2 {
		return 0, ErrContentInvalid{}
	}
	uidstr := strings.ReplaceAll(list[0], PFV, "")
	uid, err := strconv.ParseUint(uidstr, 10, 64)
	if err != nil {
		return 0, ErrContentInvalid{}
	}
	return uid, nil
}