package atomfeed

import (
	"errors"
	"fmt"
	"net/mail"
)

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

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

// AddExtension adds the Extension to the Person.
func (p *Person) AddExtension(e *ExtensionElement) {
	if p.Extensions == nil {
		p.Extensions = make([]*ExtensionElement, 1)
		p.Extensions[0] = e
	} else {
		p.Extensions = append(p.Extensions, e)
	}
}

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

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

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

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

	return nil
}