package utils

import (
	"math/rand"
	"time"

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

type Bcrypt struct {
	cost int
}

func (b *Bcrypt) Encode(password []byte) ([]byte, error) {
	return bcrypt.GenerateFromPassword(password, b.cost)
}

func (b *Bcrypt) Match(hashedPassword, password []byte) error {
	return bcrypt.CompareHashAndPassword(hashedPassword, password)
}

var Encoder = Bcrypt{
	cost: bcrypt.DefaultCost,
}

func GenPassword() string {
	rand.Seed(time.Now().UnixNano())
	digits := "0123456789"
	specials := "~=+%^*/()[]{}/!@#$?|"
	all := "ABCDEFGHIJKLMNOPQRSTUVWXYZ" +
		"abcdefghijklmnopqrstuvwxyz" +
		digits + specials
	length := 8
	buf := make([]byte, length)
	buf[0] = digits[rand.Intn(len(digits))]
	buf[1] = specials[rand.Intn(len(specials))]
	for i := 2; i < length; i++ {
		buf[i] = all[rand.Intn(len(all))]
	}
	rand.Shuffle(len(buf), func(i, j int) {
		buf[i], buf[j] = buf[j], buf[i]
	})
	return string(buf)
}