<?php
/**
 * Copyright since 2007 PrestaShop SA and Contributors
 * PrestaShop is an International Registered Trademark & Property of PrestaShop SA
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Open Software License (OSL 3.0)
 * that is bundled with this package in the file LICENSE.md.
 * It is also available through the world-wide-web at this URL:
 * https://opensource.org/licenses/OSL-3.0
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@prestashop.com so we can send you a copy immediately.
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade PrestaShop to newer
 * versions in the future. If you wish to customize PrestaShop for your
 * needs please refer to https://devdocs.prestashop.com/ for more information.
 *
 * @author    PrestaShop SA and Contributors <contact@prestashop.com>
 * @copyright Since 2007 PrestaShop SA and Contributors
 * @license   https://opensource.org/licenses/OSL-3.0 Open Software License (OSL 3.0)
 */

namespace PrestaShop\PrestaShop\Core\Domain\ValueObject;

use PrestaShop\PrestaShop\Core\Domain\Exception\DomainConstraintException;

/**
 * Class Email is responsible for providing valid email value.
 */
class Email
{
    /**
     * @var int Maximum allowed length for email
     */
    public const MAX_LENGTH = 255;

    /**
     * @var string
     */
    private $email;

    /**
     * @param string $email
     *
     * @throws DomainConstraintException
     */
    public function __construct($email)
    {
        $this->assertEmailIsString($email);
        $this->assertEmailIsNotEmpty($email);
        $this->assertEmailDoesNotExceedAllowedLength($email);

        $this->email = $email;
    }

    /**
     * @return string
     */
    public function getValue()
    {
        return $this->email;
    }

    /**
     * Check if given email is the same as current
     *
     * @param Email $email
     *
     * @return bool
     */
    public function isEqualTo(Email $email)
    {
        return strtolower($email->getValue()) === strtolower($this->getValue());
    }

    /**
     * Check that email is not an empty string
     *
     * @param string $email
     *
     * @throws DomainConstraintException
     */
    public function assertEmailIsNotEmpty($email)
    {
        if (0 === strlen($email)) {
            throw new DomainConstraintException('Email must not be empty', DomainConstraintException::INVALID_EMAIL);
        }
    }

    /**
     * Assert that email length does not exceed allowed value
     *
     * @param string $email
     *
     * @throws DomainConstraintException
     */
    private function assertEmailDoesNotExceedAllowedLength($email)
    {
        $email = html_entity_decode($email, ENT_COMPAT, 'UTF-8');

        if (self::MAX_LENGTH < mb_strlen($email, 'UTF-8')) {
            throw new DomainConstraintException(sprintf('Email is too long. Max allowed length is %s', self::MAX_LENGTH), DomainConstraintException::INVALID_EMAIL);
        }
    }

    /**
     * Assert email is of type string
     *
     * @param string $email
     *
     * @throws DomainConstraintException
     */
    private function assertEmailIsString($email)
    {
        if (!is_string($email)) {
            throw new DomainConstraintException('Email must be of type string', DomainConstraintException::INVALID_EMAIL);
        }
    }
}