package utils

import (
	"crypto/md5"
	"crypto/sha1"
	"crypto/sha256"
	"crypto/sha512"
	"encoding/hex"
	"github.com/speps/go-hashids"
	"strings"

	"golang.org/x/crypto/bcrypt"
)

// salt 盐值
const salt = "CHeF6AC392"

// Md5String
func Md5String(s string, salt ...string) string {
	h := md5.New()
	if len(salt) > 0 {
		s += strings.Join(salt, "")
	}
	h.Write([]byte(s))
	return hex.EncodeToString(h.Sum(nil))
}

// Sha1String
func Sha1String(s string) string {
	h := sha1.New()
	h.Write([]byte(s))
	return hex.EncodeToString(h.Sum(nil))
}

// Sha256String
func Sha256String(s string) string {
	h := sha256.New()
	h.Write([]byte(s))
	return hex.EncodeToString(h.Sum(nil))
}

// Sha512String
func Sha512String(s string) string {
	h := sha512.New()
	h.Write([]byte(s))
	return hex.EncodeToString(h.Sum(nil))
}

func HashString(s []byte) string {
	hash, _ := bcrypt.GenerateFromPassword(s, bcrypt.DefaultCost)
	return string(hash)
}

func HashCompare(src, compare []byte) bool {
	return bcrypt.CompareHashAndPassword(src, compare) == nil
}

// HASHIDEncode 混淆
func HASHIDEncode(src int) string {
	hd := hashids.NewData()
	hd.Salt = salt
	hd.MinLength = 8
	h := hashids.NewWithData(hd)
	e, _ := h.Encode([]int{src})
	return e
}

// HASHIDDecode 还原混淆
func HASHIDDecode(src string) int {
	hd := hashids.NewData()
	hd.Salt = salt
	h := hashids.NewWithData(hd)
	e, err := h.DecodeWithError(src)

	if err != nil {
		return 0
	}
	return e[0]
}