// Statup
// Copyright (C) 2018.  Hunter Long and the project contributors
// Written by Hunter Long <info@socialeck.com> and the project contributors
//
// https://github.com/hunterlong/statup
//
// The licenses for most software and other practical works are designed
// to take away your freedom to share and change the works.  By contrast,
// the GNU General Public License is intended to guarantee your freedom to
// share and change all versions of a program--to make sure it remains free
// software for all its users.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

package utils

import (
	"crypto/sha1"
	"fmt"
	"golang.org/x/crypto/bcrypt"
	"math/rand"
)

// HashPassword returns the bcrypt hash of a password string
func HashPassword(password string) string {
	bytes, _ := bcrypt.GenerateFromPassword([]byte(password), 14)
	return string(bytes)
}

// NewSHA1Hash returns a random SHA1 hash based on a specific length
func NewSHA1Hash(n ...int) string {
	noRandomCharacters := 32
	if len(n) > 0 {
		noRandomCharacters = n[0]
	}
	randString := RandomString(noRandomCharacters)
	hash := sha1.New()
	hash.Write([]byte(randString))
	bs := hash.Sum(nil)
	return fmt.Sprintf("%x", bs)
}

var characterRunes = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789")

// RandomString generates a random string of n length
func RandomString(n int) string {
	b := make([]rune, n)
	for i := range b {
		b[i] = characterRunes[rand.Intn(len(characterRunes))]
	}
	return string(b)
}