package crypto

import (
	"math/rand"
	"encoding/json"

	"github.com/google/uuid"
)

const DEFAULT_LENGTH int  = 25

type Password struct {
	Service string `json:"Service"`
	Url string `json:"Url"`
	Username string `json:"Username"`
	Password string `json:"Password"`
	Tags []string `json:"Tags"`
	Id uuid.UUID `json:"Id"`
}

func (p *Password) ToJson() ([]byte, error) {
	return json.Marshal(p)
}

func GetPasswordFromJson(b []byte) (Password, error) {
	var result Password
	err := json.Unmarshal(b, &result)

	if err != nil {
		return Password{}, err
	}

	return result, nil
}

func NewPassword(length int) *Password {
	return &Password{
		Id: uuid.New(), 
		Password: GenerateRandomString(length),
	}
}

func GenerateRandomString(length int) string {
	charset := "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
	b := make([]byte, length)
	for i := range b {
		b[i] = charset[rand.Intn(len(charset))]
	}
	return string(b)
}