package models

import (
	"regexp"
	"time"

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

var ValidUserName = regexp.MustCompile(`^[a-zA-Z0-9_-]+$`)

type User struct {
	ID             int64
	Username       string
	PasswordHashed []byte
	TimeZone       string
	Created        time.Time
}

func (u *User) SetPassword(pwd string) {
	bcrypted, _ := bcrypt.GenerateFromPassword([]byte(pwd), bcrypt.DefaultCost)
	u.PasswordHashed = bcrypted
}

func (u User) CheckPassword(pwd string) bool {
	err := bcrypt.CompareHashAndPassword(u.PasswordHashed, []byte(pwd))
	return err == nil
}

func (u User) FormatTime(t time.Time) string {
	if loc := getLocation(u.TimeZone); loc != nil {
		return t.In(loc).Format("2006-01-02 15:04:05")
	}
	return t.Format("2006-01-02 15:04:05")
}

var loadedLocation = map[string]*time.Location{}

func getLocation(tz string) *time.Location {
	if loc, ok := loadedLocation[tz]; ok {
		return loc
	}
	loc, err := time.LoadLocation(tz)
	if err != nil {
		loc = time.Local
	}
	loadedLocation[tz] = loc
	return loc
}