package atom

import (
	"encoding/xml"
	"errors"
	"fmt"
)

type Icon struct {
	XMLName xml.Name `xml:"icon"`
	*CommonAttributes
	URI IRI `xml:",chardata"`
}

// NewIcon creates a new Icon. It returns a *Icon and an error.
func NewIcon(uri IRI) (*Icon, error) {
	if !isValidIRI(uri) {
		return nil, fmt.Errorf("uri %v not correctly formatted", uri)
	}

	return &Icon{URI: uri}, nil
}

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

	return nil
}