package main

import "fmt"

type Repository interface {
	Save(user *User) error
}

type User struct {
	firstName  string
	lastName   string
	repository Repository
}

func NewUser(firstName string, lastName string, repository Repository) *User {
	return &User{
		firstName:  firstName,
		lastName:   lastName,
		repository: repository,
	}
}

func (u User) Save() {
	u.repository.Save(&u)
}

type DbRepository struct {
	DbName string
}

func (r DbRepository) Save(user *User) error {
	fmt.Printf("Saving %s %s to DB name %s...\n", user.firstName, user.lastName, r.DbName)
	return nil
}

type ApiRepository struct {
	Url string
}

func (r ApiRepository) Save(user *User) error {
	fmt.Printf("Saving %s %s to API url %s...\n", user.firstName, user.lastName, r.Url)
	return nil
}

func main() {
	pero := NewUser("Pero", "Perić", &DbRepository{DbName: "pero_db"})
	pero.Save()

	mirko := NewUser("Mirko", "Mirković", &ApiRepository{Url: "http://pero.com"})
	mirko.Save()
}