<?php
/**
 * Sending path for the free mailers.
 *
 * @package AJSM
 */

namespace AJSM;

defined( 'ABSPATH' ) || exit;

/**
 * Configures PHPMailer and records failures.
 */
class Mailer {

	/**
	 * Debug transcript lines during a test.
	 *
	 * @var string[]|null
	 */
	private static $transcript = null;

	/**
	 * Hooks.
	 */
	public static function init() {
		add_action( 'phpmailer_init', array( __CLASS__, 'configure' ), 999 );
		add_filter( 'wp_mail_from', array( __CLASS__, 'from_email' ), 999 );
		add_filter( 'wp_mail_from_name', array( __CLASS__, 'from_name' ), 999 );
		add_action( 'wp_mail_failed', array( __CLASS__, 'failed' ) );
	}

	/**
	 * Mailers. Free provides php + smtp; add-ons add more.
	 *
	 * @return array id => label
	 */
	public static function mailers() {
		return (array) apply_filters(
			'ajsm_mailers',
			array(
				'php'  => __( 'Default (PHP mail)', '007aj-smtp-mailer' ),
				'smtp' => __( 'Other SMTP', '007aj-smtp-mailer' ),
			)
		);
	}

	/**
	 * Mailer used for the current message (add-ons may route).
	 *
	 * @return string
	 */
	public static function active() {
		$m = (string) Options::get( 'mailer', 'php' );
		$m = (string) apply_filters( 'ajsm_active_mailer', $m );
		return array_key_exists( $m, self::mailers() ) ? $m : 'php';
	}

	/**
	 * SMTP presets.
	 *
	 * @return array
	 */
	public static function presets() {
		return array(
			'fastmail' => array( 'label' => 'Fastmail', 'host' => 'smtp.fastmail.com', 'port' => 465, 'enc' => 'ssl', 'note' => __( 'Create an app password in Fastmail (Settings > Privacy & Security > App passwords, access: SMTP). Username is your full Fastmail address. From Email must be that address or a verified alias.', '007aj-smtp-mailer' ) ),
			'gmail'    => array( 'label' => 'Gmail (app password)', 'host' => 'smtp.gmail.com', 'port' => 465, 'enc' => 'ssl', 'note' => __( 'Turn on 2-Step Verification, then create an app password at myaccount.google.com/apppasswords. Username is your Gmail address.', '007aj-smtp-mailer' ) ),
			'outlook'  => array( 'label' => 'Outlook.com / Hotmail', 'host' => 'smtp-mail.outlook.com', 'port' => 587, 'enc' => 'tls', 'note' => __( 'Use your Outlook.com address. If two-step verification is on, use an app password.', '007aj-smtp-mailer' ) ),
			'yahoo'    => array( 'label' => 'Yahoo Mail', 'host' => 'smtp.mail.yahoo.com', 'port' => 465, 'enc' => 'ssl', 'note' => __( 'Generate an app password in Yahoo Account Security.', '007aj-smtp-mailer' ) ),
			'zoho'     => array( 'label' => 'Zoho Mail', 'host' => 'smtp.zoho.com', 'port' => 465, 'enc' => 'ssl', 'note' => __( 'EU accounts use smtp.zoho.eu. Use an app-specific password if two-factor login is on.', '007aj-smtp-mailer' ) ),
			'icloud'   => array( 'label' => 'iCloud Mail', 'host' => 'smtp.mail.me.com', 'port' => 587, 'enc' => 'tls', 'note' => __( 'Create an app-specific password at appleid.apple.com. Username is your iCloud address.', '007aj-smtp-mailer' ) ),
			'office365' => array( 'label' => 'Office 365 / GoDaddy', 'host' => 'smtp.office365.com', 'port' => 587, 'enc' => 'tls', 'note' => __( 'SMTP AUTH must be enabled for the mailbox by your Microsoft 365 admin.', '007aj-smtp-mailer' ) ),
			'cpanel'   => array( 'label' => 'cPanel / hosting mailbox', 'host' => 'mail.' . self::site_domain(), 'port' => 465, 'enc' => 'ssl', 'note' => __( 'Use the mailbox address and password from your hosting control panel. Your host may use a different server name.', '007aj-smtp-mailer' ) ),
		);
	}

	/**
	 * Site domain without www.
	 *
	 * @return string
	 */
	public static function site_domain() {
		$h = (string) wp_parse_url( home_url(), PHP_URL_HOST );
		return preg_replace( '/^www\./', '', $h );
	}

	/**
	 * Filter From email.
	 *
	 * @param string $email Current.
	 * @return string
	 */
	public static function from_email( $email ) {
		$mine = sanitize_email( (string) Options::get( 'from_email', '' ) );
		if ( '' === $mine || ! is_email( $mine ) ) {
			return $email;
		}
		$default = 0 === strpos( (string) $email, 'wordpress@' );
		return ( Options::get( 'force_from_email' ) || $default ) ? $mine : $email;
	}

	/**
	 * Filter From name.
	 *
	 * @param string $name Current.
	 * @return string
	 */
	public static function from_name( $name ) {
		$mine = (string) Options::get( 'from_name', '' );
		if ( '' === $mine ) {
			return $name;
		}
		return ( Options::get( 'force_from_name' ) || 'WordPress' === $name ) ? $mine : $name;
	}

	/**
	 * Configure PHPMailer.
	 *
	 * @param \PHPMailer\PHPMailer\PHPMailer $phpmailer Instance.
	 */
	public static function configure( $phpmailer ) {
		$s = Options::all();
		if ( ! empty( $s['return_path'] ) && is_email( $phpmailer->From ) ) {
			$phpmailer->Sender = $phpmailer->From;
		}
		$reply = sanitize_email( (string) $s['reply_to'] );
		if ( $reply && is_email( $reply ) && ! $phpmailer->getReplyToAddresses() ) {
			$phpmailer->addReplyTo( $reply );
		}
		$mailer = self::active();
		if ( 'smtp' === $mailer && '' !== (string) $s['smtp_host'] ) {
			$phpmailer->isSMTP();
			$phpmailer->Host       = (string) $s['smtp_host'];
			$phpmailer->Port       = (int) $s['smtp_port'];
			$enc                   = (string) $s['smtp_encryption'];
			$phpmailer->SMTPSecure = in_array( $enc, array( 'ssl', 'tls' ), true ) ? $enc : '';
			$phpmailer->SMTPAutoTLS = 'none' === $enc ? (bool) $s['smtp_autotls'] : true;
			$phpmailer->SMTPAuth   = (bool) $s['smtp_auth'];
			$phpmailer->Timeout    = (int) apply_filters( 'ajsm_smtp_timeout', 20 );
			if ( $phpmailer->SMTPAuth ) {
				$phpmailer->Username = (string) $s['smtp_user'];
				$phpmailer->Password = Options::secret( 'smtp_pass' );
			}
		} elseif ( 'php' === $mailer ) {
			$phpmailer->isMail();
		}
		if ( null !== self::$transcript ) {
			$phpmailer->SMTPDebug   = 3;
			$phpmailer->Debugoutput = array( __CLASS__, 'capture' );
		}
		do_action( 'ajsm_phpmailer_configured', $phpmailer, $mailer );
	}

	/**
	 * Capture a debug line.
	 *
	 * @param string $line Line.
	 */
	public static function capture( $line ) {
		if ( null !== self::$transcript && count( self::$transcript ) < 400 ) {
			self::$transcript[] = rtrim( (string) $line );
		}
	}

	/**
	 * Record a failure.
	 *
	 * @param \WP_Error $error Error from wp_mail.
	 */
	public static function failed( $error ) {
		if ( ! is_wp_error( $error ) ) {
			return;
		}
		$data = (array) $error->get_error_data();
		Options::log_error(
			$error->get_error_message(),
			array(
				'to'      => isset( $data['to'] ) ? $data['to'] : array(),
				'subject' => isset( $data['subject'] ) ? $data['subject'] : '',
				'mailer'  => isset( $data['ajsm_mailer'] ) ? $data['ajsm_mailer'] : self::active(),
			)
		);
	}

	/**
	 * Send a test email.
	 *
	 * @param string $to Recipient.
	 * @param bool   $html HTML or plain.
	 * @return array { ok, error, title, advice, transcript }
	 */
	public static function send_test( $to, $html = true ) {
		self::$transcript = array();
		$err              = '';
		$catch            = function ( $e ) use ( &$err ) {
			$err = $e->get_error_message();
		};
		add_action( 'wp_mail_failed', $catch, 1 );
		$type = function () use ( $html ) {
			return $html ? 'text/html' : 'text/plain';
		};
		add_filter( 'wp_mail_content_type', $type, 999 );
		/* translators: %s: site name */
		$subject = sprintf( __( '007AJ SMTP Mailer test email from %s', '007aj-smtp-mailer' ), wp_specialchars_decode( get_bloginfo( 'name' ), ENT_QUOTES ) );
		$body    = $html
			? '<p>' . esc_html__( 'Congratulations, your WordPress site can send email with 007AJ SMTP Mailer.', '007aj-smtp-mailer' ) . '</p><p>' . esc_html( home_url() ) . '</p>'
			: __( 'Congratulations, your WordPress site can send email with 007AJ SMTP Mailer.', '007aj-smtp-mailer' ) . "\n\n" . home_url();
		$ok = wp_mail( $to, $subject, $body, array( 'X-AJSM-Test: 1' ) );
		remove_filter( 'wp_mail_content_type', $type, 999 );
		remove_action( 'wp_mail_failed', $catch, 1 );
		$lines            = self::$transcript;
		self::$transcript = null;
		$transcript       = Options::mask( implode( "\n", $lines ) );
		$out              = array(
			'ok'         => (bool) $ok,
			'error'      => Options::mask( $err ),
			'title'      => '',
			'advice'     => '',
			'transcript' => $transcript,
		);
		if ( ! $ok ) {
			$d             = Diagnosis::explain( $err . "\n" . $transcript );
			$out['title']  = $d['title'];
			$out['advice'] = $d['advice'];
		}
		return $out;
	}
}