package atom

import (
	"fmt"
	"net/mail"
)

type Person struct {
	*CommonAttributes
	Name       string              `xml:"name"`
	URI        string              `xml:"uri,omitempty"`   // IRI
	Email      string              `xml:"email,omitempty"` // EmailAddress
	Extensions []*ExtensionElement `xml:",any,omitempty"`
}

// NewPerson creates a new Person. It returns a *Person.
func NewPerson(name string) *Person {
	return &Person{
		CommonAttributes: newCommonAttributes(),
		Name:             name,
	}
}

// AddExtension adds the Extension to the Person.
func (p *Person) AddExtension(e *ExtensionElement) {
	addToSlice(p.Extensions, e)
}

// DeleteExtension deletes the Extension from the Person. It return an error.
func (p *Person) DeleteExtension(id int) error {
	if err := deleteFromSlice(p.Extensions, id); err != nil {
		return fmt.Errorf("error deleting extension %v from person %v: %v", id, p, err)
	}
	return nil
}

// Check checks the Person for incompatibilities with RFC4287. It returns an
// error.
func (p *Person) Check() error {
	if p.Name == "" {
		return fmt.Errorf("name element of person %v empty", p)
	}

	if p.URI != "" {
		if !isValidIRI(p.URI) {
			return fmt.Errorf("uri element of person %v not correctly formatted", p)
		}
	}

	if p.Email != "" {
		if _, err := mail.ParseAddress(p.Email); err != nil {
			return fmt.Errorf("email element of person %v not correctly formatted", p)
		}
	}

	for i, e := range p.Extensions {
		if err := e.Check(); err != nil {
			return fmt.Errorf("extension element %v of person %v: %v", i, p, err)
		}
	}

	return nil
}