package atom

import (
	"encoding/xml"
	"fmt"
)

type Logo struct {
	XMLName xml.Name `xml:"logo"`
	*CommonAttributes
	URI string `xml:",chardata"` // IRI
}

// NewLogo creates a new Logo. It returns a *Logo.
func NewLogo(uri string) *Logo {
	return &Logo{
		CommonAttributes: newCommonAttributes(),
		URI:              uri,
	}
}

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

	return nil
}