<?php
/**
 * Sends the site's email through the saved SMTP account.
 *
 * @package ForensixDigital
 */

declare(strict_types=1);

namespace ForensixDigital\Apps\Mail;

defined( 'ABSPATH' ) || exit;

use ForensixDigital\Services\Security\Vault;
use ForensixDigital\Services\Settings\Settings;

/**
 * Configures WordPress's mailer. Does nothing when the mode is "WordPress default", when no
 * host is set, or when another mail plugin is active.
 */
final class Mailer {

	/**
	 * Creates the mailer.
	 *
	 * @param Settings $settings Settings service.
	 * @param Vault    $vault    Credential vault.
	 */
	public function __construct( private Settings $settings, private Vault $vault ) {}

	/**
	 * Hooks into wp_mail.
	 */
	public function register(): void {
		add_action( 'phpmailer_init', array( $this, 'configure' ) );
		add_filter( 'wp_mail_from', array( $this, 'from_email' ) );
		add_filter( 'wp_mail_from_name', array( $this, 'from_name' ) );
	}

	/**
	 * Removes the hooks.
	 */
	public function unregister(): void {
		remove_action( 'phpmailer_init', array( $this, 'configure' ) );
		remove_filter( 'wp_mail_from', array( $this, 'from_email' ) );
		remove_filter( 'wp_mail_from_name', array( $this, 'from_name' ) );
	}

	/**
	 * Whether Forensix sends the email.
	 */
	public function in_charge(): bool {
		$values = $this->settings->all( MailConfig::SCOPE );
		return 'smtp' === $values['mode'] && '' !== $values['host'] && array() === OtherMailers::active();
	}

	/**
	 * Points PHPMailer at the SMTP server.
	 *
	 * @param mixed $phpmailer PHPMailer instance.
	 */
	public function configure( $phpmailer ): void {
		if ( ! $phpmailer instanceof \PHPMailer\PHPMailer\PHPMailer || ! $this->in_charge() ) {
			return;
		}
		$values = $this->settings->all( MailConfig::SCOPE );

		// phpcs:disable WordPress.NamingConventions.ValidVariableName.UsedPropertyNotSnakeCase -- PHPMailer's own property names.
		$phpmailer->isSMTP();
		$phpmailer->Host        = (string) $values['host'];
		$phpmailer->Port        = (int) $values['port'];
		$phpmailer->SMTPSecure  = 'none' === $values['encryption'] ? '' : (string) $values['encryption'];
		$phpmailer->SMTPAutoTLS = 'none' !== $values['encryption'];
		$phpmailer->SMTPAuth    = (bool) $values['auth'];
		if ( $phpmailer->SMTPAuth ) {
			$phpmailer->Username = (string) $values['username'];
			$phpmailer->Password = $this->vault->unlock( (string) $values['password_locked'] );
		}
		// phpcs:enable WordPress.NamingConventions.ValidVariableName.UsedPropertyNotSnakeCase
	}

	/**
	 * The sender address, when one is set.
	 *
	 * @param mixed $email Address WordPress would use.
	 * @return mixed
	 */
	public function from_email( $email ) {
		$value = (string) $this->settings->get( MailConfig::SCOPE, 'from_email', '' );
		return $this->in_charge() && '' !== $value ? $value : $email;
	}

	/**
	 * The sender name, when one is set.
	 *
	 * @param mixed $name Name WordPress would use.
	 * @return mixed
	 */
	public function from_name( $name ) {
		$value = (string) $this->settings->get( MailConfig::SCOPE, 'from_name', '' );
		return $this->in_charge() && '' !== $value ? $value : $name;
	}
}