package atomfeed

import (
	"errors"
	"fmt"

	"github.com/google/uuid"
)

type Logo struct {
	*CommonAttributes
	URI IRI `xml:"uri"`
}

// NewLogo creates a new Logo. It returns a *Logo.
func NewLogo() *Logo {
	return &Logo{URI: IRI(fmt.Sprint("urn:uuid:", uuid.New()))}
}

// Check checks the Logo for incompatibilities with RFC4287. It returns an
// error.
func (l *Logo) Check() error {
	if l.URI == "" {
		return errors.New("uri element of logo empty")
	} else {
		if !isValidIRI(l.URI) {
			return fmt.Errorf("uri element %v of logo not correctly formatted", l.URI)
		}
	}

	return nil
}