<?php
/**
 * This helper builds the EmailAddress object for a /mail/send API call
 */

namespace SendGrid\Mail;

use SendGrid\Helper\Assert;

/**
 * This class is used to construct a EmailAddress object for the /mail/send API call
 *
 * @package SendGrid\Mail
 */
class EmailAddress implements \JsonSerializable
{
    /** @var $name string The name of the person associated with the email */
    private $name;
    /** @var $email string The email address */
    private $email;
    /** @var $substitutions Substitution[] An array of key/value substitutions
     * to be be applied to the text and html content of the email body
     */
    private $substitutions;
    /** @var $subject Subject The personalized subject of the email */
    private $subject;

    /**
     * Optional constructor
     *
     * @param string|null $emailAddress  The email address
     * @param string|null $name          The name of the person associated with
     *                                   the email
     * @param array|null  $substitutions An array of key/value substitutions to
     *                                   be be applied to the text and html content
     *                                   of the email body
     * @param string|null $subject       The personalized subject of the email
     * @throws TypeException
     */
    public function __construct(
        $emailAddress = null,
        $name = null,
        $substitutions = null,
        $subject = null
    ) {
        if (isset($emailAddress)) {
            $this->setEmailAddress($emailAddress);
        }
        if (isset($name) && $name !== null) {
            $this->setName($name);
        }
        if (isset($substitutions)) {
            $this->setSubstitutions($substitutions);
        }
        if (isset($subject)) {
            $this->setSubject($subject);
        }
    }

    /**
     * Add the email address to a EmailAddress object
     *
     * @param string $emailAddress The email address
     *
     * @throws TypeException
     */
    public function setEmailAddress($emailAddress)
    {
        Assert::email($emailAddress, 'emailAddress');

        $this->email = $emailAddress;
    }

    /**
     * Retrieve the email address from a EmailAddress object
     *
     * @return string
     */
    public function getEmailAddress()
    {
        return $this->email;
    }

    /**
     * Retrieve the email address from a EmailAddress object
     *
     * @return string
     */
    public function getEmail()
    {
        return $this->getEmailAddress();
    }

    /**
     * Add a name to a EmailAddress object
     *
     * @param string $name The name of the person associated with the email
     *
     * @throws TypeException
     */
    public function setName($name)
    {
        Assert::string($name, 'name');

        $this->name = (!empty($name)) ? $name : null;
    }

    /**
     * Retrieve the name from a EmailAddress object
     *
     * @return string
     */
    public function getName()
    {
        return $this->name;
    }

    /**
     * Add substitutions to a EmailAddress object
     *
     * @param array $substitutions An array of key/value substitutions to
     *                             be be applied to the text and html content
     *                             of the email body
     *
     * @throws TypeException
     */
    public function setSubstitutions($substitutions)
    {
        Assert::maxItems($substitutions, 'substitutions', 10000);

        $this->substitutions = $substitutions;
    }

    /**
     * Retrieve substitutions from a EmailAddress object
     */
    public function getSubstitutions()
    {
        return $this->substitutions;
    }

    /**
     * Add a subject to a EmailAddress object
     *
     * @param string $subject The personalized subject of the email
     *
     * @throws TypeException
     */
    public function setSubject($subject)
    {
        Assert::string($subject, 'subject');

        // Now that we know it is a string, we can safely create a new subject
        $this->subject = new Subject($subject);
    }

    /**
     * Retrieve a subject from an EmailAddress object
     *
     * @return Subject
     */
    public function getSubject()
    {
        return $this->subject;
    }

    /**
     * Determine if this EmailAddress object is personalized by either
     * containing substitutions or a specific subject.
     *
     * @return bool
     */
    public function isPersonalized()
    {
        return $this->getSubstitutions() || $this->getSubject();
    }

    /**
     * Return an array representing an EmailAddress object for the Twilio SendGrid API
     *
     * @return null|array
     */
    public function jsonSerialize()
    {
        return array_filter(
            [
                'name' => $this->getName(),
                'email' => $this->getEmail()
            ],
            function ($value) {
                return $value !== null;
            }
        ) ?: null;
    }
}
