package domain

import (
	"math/rand"
	"strconv"
)

type ShortURL struct {
	URL
	target TargetURL
}

func (su ShortURL) Target() TargetURL {
	return su.target
}

/*
MakeShortURL creates a ShortURL instance from a given RedirectURL/target pair.
*/
func NewUnspecifiedShortURL(target TargetURL) (ShortURL, error) {
	var su ShortURL
	if target.IsEmpty() {
		return su, MakeError(nil, TargetInvalid.Other, "empty URL")
	}

	// FIXME: will cause collisions.
	url := URL(strconv.Itoa(rand.Intn(1 << 31)))
	su = ShortURL{url, target}
	return su, nil
}