package services

import "time"

type Unit string

const (
	Metric   = Unit("Metric")
	Imperial = Unit("Imperial")
)

type User struct {
	ID           int64      `json:"id"`
	Email        string     `json:"email"`
	Username     string     `json:"username"`
	DisplayUnit  Unit       `json:"displayUnit"`
	Birthdate    *time.Time `json:"birthdate"`
	Height       *float64   `json:"height"`
	PasswordHash string     `json:"-"`
}

func (u User) Merge(other User) User {
	nu := u

	if other.Email != "" {
		nu.Email = other.Email
	}

	if other.Username != "" {
		nu.Username = other.Username
	}

	if other.PasswordHash != "" {
		nu.PasswordHash = other.PasswordHash
	}

	if other.Birthdate != nil {
		nu.Birthdate = other.Birthdate
	}

	if other.Height != nil && *other.Height != 0 {
		nu.Height = other.Height
	}

	if other.DisplayUnit != "" {
		nu.DisplayUnit = other.DisplayUnit
	}

	return nu
}