<?php
if ( ! class_exists( 'PostmanSendGridMailEngine' ) ) {

	require_once 'sendgrid-php-3.2.0/sendgrid-php.php';

	/**
	 * Sends mail with the SendGrid API
	 * https://sendgrid.com/docs/API_Reference/Web_API/mail.html
	 *
	 * @author jasonhendriks
	 */
	class PostmanSendGridMailEngine implements PostmanMailEngine {

		// logger for all concrete classes - populate with setLogger($logger)
		protected $logger;

		// the result
		private $transcript;

		private $email;
		private $apiKey;

		/**
		 *
		 * @param unknown $senderEmail
		 * @param unknown $accessToken
		 */
		function __construct( $apiKey ) {
			assert( ! empty( $apiKey ) );
			$this->apiKey = $apiKey;

			// create the logger
			$this->logger = new PostmanLogger( get_class( $this ) );

			// create the Message
			$this->email = new SendGrid\Email();
		}

		/**
		 * (non-PHPdoc)
		 *
		 * @see PostmanSmtpEngine::send()
		 */
		public function send( PostmanMessage $message ) {
			$options = PostmanOptions::getInstance();

			// add the Postman signature - append it to whatever the user may have set
			if ( ! $options->isStealthModeEnabled() ) {
				$pluginData = apply_filters( 'postman_get_plugin_metadata', null );
				$this->email->addHeader( 'X-Mailer', sprintf( 'Postman SMTP %s for WordPress (%s)', $pluginData ['version'], 'https://wordpress.org/plugins/post-smtp/' ) );
			}

			// add the headers - see http://framework.zend.com/manual/1.12/en/zend.mail.additional-headers.html
			foreach ( ( array ) $message->getHeaders() as $header ) {
				$this->logger->debug( sprintf( 'Adding user header %s=%s', $header ['name'], $header ['content'] ) );
				$this->email->addHeader( $header ['name'], $header ['content'] );
			}

			// if the caller set a Content-Type header, use it
			$contentType = $message->getContentType();
			if ( ! empty( $contentType ) ) {
				$this->logger->debug( 'Adding content-type ' . $contentType );
				$this->email->addHeader( 'Content-Type', $contentType );
			}

			// add the From Header
			$sender = $message->getFromAddress();
			{
				$senderEmail = $sender->getEmail();
				$senderName = $sender->getName();
				assert( ! empty( $senderEmail ) );
				$this->email->setFrom( $senderEmail );
			if ( ! empty( $senderName ) ) {
				$this->email->setFromName( $senderName );
			}
				// now log it
				$sender->log( $this->logger, 'From' );
			}

			// add the Sender Header, overriding what the user may have set
			$this->email->addHeader( 'Sender', $options->getEnvelopeSender() );

			// add the to recipients
			foreach ( ( array ) $message->getToRecipients() as $recipient ) {
				$recipient->log( $this->logger, 'To' );
				$this->email->addTo( $recipient->getEmail(), $recipient->getName() );
			}

			// add the cc recipients
			foreach ( ( array ) $message->getCcRecipients() as $recipient ) {
				$recipient->log( $this->logger, 'Cc' );
				$this->email->addCc( $recipient->getEmail(), $recipient->getName() );
			}

			// add the bcc recipients
			foreach ( ( array ) $message->getBccRecipients() as $recipient ) {
				$recipient->log( $this->logger, 'Bcc' );
				$this->email->addBcc( $recipient->getEmail(), $recipient->getName() );
			}

			// add the reply-to
			$replyTo = $message->getReplyTo();
			// $replyTo is null or a PostmanEmailAddress object
			if ( isset( $replyTo ) ) {
				$this->email->setReplyTo( $replyTo->format() );
			}

			// add the date
			$date = $message->getDate();
			if ( ! empty( $date ) ) {
				$this->email->setDate( $message->getDate() );
			}

			// add the messageId
			$messageId = $message->getMessageId();
			if ( ! empty( $messageId ) ) {
				$this->email->addHeader( 'message-id', $messageId );
			}

			// add the subject
			if ( null !== $message->getSubject() ) {
				$this->email->setSubject( $message->getSubject() );
			}

			// add the message content
			{
				$textPart = $message->getBodyTextPart();
			if ( ! empty( $textPart ) ) {
				$this->logger->debug( 'Adding body as text' );
				$this->email->setText( $textPart );
			}
				$htmlPart = $message->getBodyHtmlPart();
			if ( ! empty( $htmlPart ) ) {
				$this->logger->debug( 'Adding body as html' );
				$this->email->setHtml( $htmlPart );
			}
			}

			// add attachments
			$this->logger->debug( 'Adding attachments' );
			$this->addAttachmentsToMail( $message );

			$result = array();
			try {

				if ( $this->logger->isDebug() ) {
					$this->logger->debug( 'Creating SendGrid service with apiKey=' . $this->apiKey );
				}
				$sendgrid = new SendGrid( $this->apiKey );

				// send the message
				if ( $this->logger->isDebug() ) {
					$this->logger->debug( 'Sending mail' );
				}
				$result = $sendgrid->send( $this->email );
				if ( $this->logger->isInfo() ) {
					$this->logger->info( );
				}
				$this->transcript = print_r( $result, true );
				$this->transcript .= PostmanModuleTransport::RAW_MESSAGE_FOLLOWS;
				$this->transcript .= print_r( $this->email, true );
			} catch ( SendGrid\Exception $e ) {
				$this->transcript = $e->getMessage();
				$this->transcript .= PostmanModuleTransport::RAW_MESSAGE_FOLLOWS;
				$this->transcript .= print_r( $this->email, true );
				throw $e;
			}
		}

		/**
		 * Add attachments to the message
		 *
		 * @param Postman_Zend_Mail $mail
		 */
		private function addAttachmentsToMail( PostmanMessage $message ) {
			$attachments = $message->getAttachments();
			if ( ! is_array( $attachments ) ) {
				// WordPress may a single filename or a newline-delimited string list of multiple filenames
				$attArray = explode( PHP_EOL, $attachments );
			} else {
				$attArray = $attachments;
			}
			// otherwise WordPress sends an array
			foreach ( $attArray as $file ) {
				if ( ! empty( $file ) ) {
					$this->logger->debug( 'Adding attachment: ' . $file );
					$this->email->addAttachment( $file );
				}
			}
		}

		// return the SMTP session transcript
		public function getTranscript() {
			return $this->transcript;
		}
	}
}