<?php

if ( ! class_exists( 'PostmanWpMail' ) ) {

	/**
	 * Moved this code into a class so it could be used by both wp_mail() and PostmanSendTestEmailController
	 *
	 * @author jasonhendriks
	 */
	class PostmanWpMail {
		private $exception;
		private $transcript;
		private $totalTime;
		private $logger;

		/**
		 * Load the dependencies
		 */
		public function init() {
			$this->logger = new PostmanLogger( get_class( $this ) );
			require_once 'Postman-Mail/PostmanMessage.php';
			require_once 'Postman-Email-Log/PostmanEmailLogService.php';
			require_once 'Postman-Mail/PostmanMailEngine.php';
			require_once 'Postman-Auth/PostmanAuthenticationManagerFactory.php';
			require_once 'PostmanState.php';
		}

		/**
		 * This methods follows the wp_mail function interface, but implements it Postman-style.
		 * Exceptions are held for later inspection.
		 * An instance of PostmanState updates the success/fail tally.
		 *
		 * @param mixed $to
		 * @param mixed $subject
		 * @param mixed $body
		 * @param mixed $headers
		 * @param mixed $attachments
		 * @return boolean
		 */
		public function send( $to, $subject, $message, $headers = '', $attachments = array() ) {

			// initialize for sending
			$this->init();

			// build the message
			$postmanMessage = $this->processWpMailCall( $to, $subject, $message, $headers, $attachments );

			// build the email log entry
			$log = new PostmanEmailLog();
			$log->originalTo = $to;
			$log->originalSubject = $subject;
			$log->originalMessage = $message;
			$log->originalHeaders = $headers;

			// send the message and return the result
			return $this->sendMessage( $postmanMessage, $log );
		}

        /**
         * @param PostmanMessage $message
         * @return PostmanMessage
         */
		private function apply_default_headers( $message ) {
            $headers[] = 'Message-ID: ' . $this->createMessageId();
            $message->addHeaders($headers);
        }

        /**
         * Creates the Message-ID
         *
         * @return string
         */
        public function createMessageId() {

            $id = md5(uniqid(time()));

            if (isset($_SERVER["SERVER_NAME"])) {
                $hostName = $_SERVER["SERVER_NAME"];
            } else {
                $hostName = php_uname('n');
            }

            return $id . '@' . $hostName;
        }

		/**
		 * Builds a PostmanMessage based on the WordPress wp_mail parameters
		 *
		 * @param mixed $to
		 * @param mixed $subject
		 * @param mixed $message
		 * @param mixed $headers
		 * @param mixed $attachments
		 */
		private function processWpMailCall( $to, $subject, $message, $headers, $attachments ) {
			$this->logger->trace( 'wp_mail parameters before applying WordPress wp_mail filter:' );
			$this->traceParameters( $to, $subject, $message, $headers, $attachments );

			/**
			 * Filter the wp_mail() arguments.
			 *
			 * @since 1.5.4
			 *
			 * @param array $args
			 *        	A compacted array of wp_mail() arguments, including the "to" email,
			 *        	subject, message, headers, and attachments values.
			 */
			$atts = apply_filters( 'wp_mail', compact( 'to', 'subject', 'message', 'headers', 'attachments' ) );
			if ( isset( $atts ['to'] ) ) {
				$to = $atts ['to'];
			}

			if ( isset( $atts ['subject'] ) ) {
				$subject = $atts ['subject'];
			}

			if ( isset( $atts ['message'] ) ) {
				$message = $atts ['message'];
			}

			if ( isset( $atts ['headers'] ) ) {
				$headers = $atts ['headers'];
			}

			if ( isset( $atts ['attachments'] ) ) {
				$attachments = $atts ['attachments'];
			}

			if ( ! is_array( $attachments ) ) {
				$attachments = explode( "\n", str_replace( "\r\n", "\n", $attachments ) );
			}

			$this->logger->trace( 'wp_mail parameters after applying WordPress wp_mail filter:' );
			$this->traceParameters( $to, $subject, $message, $headers, $attachments );

			// Postman API: register the response hook
			add_filter( 'postman_wp_mail_result', array(
					$this,
					'postman_wp_mail_result',
			) );

			// create the message
			$postmanMessage = $this->createNewMessage();
			$this->populateMessageFromWpMailParams( $postmanMessage, $to, $subject, $message, $headers, $attachments );

			// return the message
			return $postmanMessage;
		}

		/**
		 * Creates a new instance of PostmanMessage with a pre-set From and Reply-To
		 *
		 * @return PostmanMessage
		 */
		public function createNewMessage() {
			$message = new PostmanMessage();
			$options = PostmanOptions::getInstance();
			// the From is set now so that it can be overridden
			$transport = PostmanTransportRegistry::getInstance()->getActiveTransport();
			$message->setFrom( $transport->getFromEmailAddress(), $transport->getFromName() );
			// the Reply-To is set now so that it can be overridden
			$message->setReplyTo( $options->getReplyTo() );
			$message->setCharset( get_bloginfo( 'charset' ) );
			return $message;
		}

		/**
		 * A convenient place for any code to inject a constructed PostmanMessage
		 * (for example, from MyMail)
		 *
		 * The body parts may be set already at this time.
		 *
		 * @param PostmanMessage $message
		 * @return boolean
		 */
		public function sendMessage( PostmanMessage $message, PostmanEmailLog $log ) {

		    $this->apply_default_headers( $message );

			// get the Options and AuthToken
			$options = PostmanOptions::getInstance();
			$authorizationToken = PostmanOAuthToken::getInstance();

			// get the transport and create the transportConfig and engine
			$transport = PostmanTransportRegistry::getInstance()->getActiveTransport();

			// create the Mail Engine
			$engine = $transport->createMailEngine();

			// add plugin-specific attributes to PostmanMessage
			$message->addHeaders( $options->getAdditionalHeaders() );
			$message->addTo( $options->getForcedToRecipients() );
			$message->addCc( $options->getForcedCcRecipients() );
			$message->addBcc( $options->getForcedBccRecipients() );

			// apply the WordPress filters
			// may impact the from address, from email, charset and content-type
			$message->applyFilters();
			//do_action_ref_array( 'phpmailer_init', array( &$message ) );

			// create the body parts (if they are both missing)
			if ( $message->isBodyPartsEmpty() ) {
				$message->createBodyParts();
			}

			// is this a test run?
			$testMode = apply_filters( 'postman_test_email', false );
			if ( $this->logger->isDebug() ) {
				$this->logger->debug( 'testMode=' . $testMode );
			}

			// start the clock
			$startTime = microtime( true ) * 1000;

			try {

				// prepare the message
				$message->validate( $transport );

				// send the message
				if ( $options->getRunMode() == PostmanOptions::RUN_MODE_PRODUCTION ) {
					if ( $transport->isLockingRequired() ) {
						PostmanUtils::lock();
						// may throw an exception attempting to contact the OAuth2 provider
						$this->ensureAuthtokenIsUpdated( $transport, $options, $authorizationToken );
					}

					$this->logger->debug( 'Sending mail' );
					// may throw an exception attempting to contact the SMTP server
					$engine->send( $message );

					// increment the success counter, unless we are just tesitng
					if ( ! $testMode ) {
						PostmanState::getInstance()->incrementSuccessfulDelivery();
					}
				}

				// clean up
				$this->postSend( $engine, $startTime, $options, $transport );

				if ( $options->getRunMode() == PostmanOptions::RUN_MODE_PRODUCTION || $options->getRunMode() == PostmanOptions::RUN_MODE_LOG_ONLY ) {
					// log the successful delivery
					PostmanEmailLogService::getInstance()->writeSuccessLog( $log, $message, $engine->getTranscript(), $transport );
				}

				// return successful
				return true;
			} catch ( Exception $e ) {
				// save the error for later
				$this->exception = $e;

				// write the error to the PHP log
				$this->logger->error( get_class( $e ) . ' code=' . $e->getCode() . ' message=' . trim( $e->getMessage() ) );

				// increment the failure counter, unless we are just tesitng
				if ( ! $testMode && $options->getRunMode() == PostmanOptions::RUN_MODE_PRODUCTION ) {
					PostmanState::getInstance()->incrementFailedDelivery();
				}

				// clean up
				$this->postSend( $engine, $startTime, $options, $transport );

				if ( $options->getRunMode() == PostmanOptions::RUN_MODE_PRODUCTION || $options->getRunMode() == PostmanOptions::RUN_MODE_LOG_ONLY ) {
					// log the failed delivery
					PostmanEmailLogService::getInstance()->writeFailureLog( $log, $message, $engine->getTranscript(), $transport, $e->getMessage() );
				}

                // Fallback
                if ( $this->fallback( $log, $message, $options ) ) {

				    return true;

                }

				$mail_error_data = array(
					'to' => $message->getToRecipients(),
					'subject' => $message->getSubject(),
					'message' => $message->getBody(),
					'headers' => $message->getHeaders(),
					'attachments' => $message->getAttachments()
				);
				$mail_error_data['phpmailer_exception_code'] = $e->getCode();

				do_action( 'wp_mail_failed', new WP_Error( 'wp_mail_failed', $e->getMessage(), $mail_error_data ) );

				// return failure
                if ( PostmanOptions::getInstance()->getSmtpMailer() == 'phpmailer' ) {
                    throw new phpmailerException($e->getMessage(), $e->getCode());
                }
				return false;

			}
		}

		private function fallback( $log, $postMessage,$options ) {

            if ( ! $options->is_fallback && $options->getFallbackIsEnabled() && $options->getFallbackIsEnabled() == 'yes' ) {

                $options->is_fallback = true;

                $status = $this->sendMessage( $postMessage, $log );

                $options->is_fallback = false;

                return $status;

            } else {
                $options->is_fallback = false;
            }

			return false;
        }

		/**
		 * Clean up after sending the mail
		 *
		 * @param PostmanZendMailEngine $engine
		 * @param mixed               $startTime
		 */
		private function postSend( PostmanMailEngine $engine, $startTime, PostmanOptions $options, PostmanModuleTransport $transport ) {
			// save the transcript
			$this->transcript = $engine->getTranscript();

			// log the transcript
			if ( $this->logger->isTrace() ) {
				$this->logger->trace( 'Transcript:' );
				$this->logger->trace( $this->transcript );
			}

			// delete the semaphore
			if ( $transport->isLockingRequired() ) {
				PostmanUtils::unlock();
			}

			// stop the clock
			$endTime = microtime( true ) * 1000;
			$this->totalTime = $endTime - $startTime;
		}

		/**
		 * Returns the result of the last call to send()
		 *
		 * @return multitype:Exception NULL
		 */
		function postman_wp_mail_result() {
			$result = array(
					'time' => $this->totalTime,
					'exception' => $this->exception,
					'transcript' => $this->transcript,
			);
			return $result;
		}

		/**
		 */
		private function ensureAuthtokenIsUpdated( PostmanModuleTransport $transport, PostmanOptions $options, PostmanOAuthToken $authorizationToken ) {
			assert( ! empty( $transport ) );
			assert( ! empty( $options ) );
			assert( ! empty( $authorizationToken ) );
			// ensure the token is up-to-date
			$this->logger->debug( 'Ensuring Access Token is up-to-date' );
			// interact with the Authentication Manager
			$wpMailAuthManager = PostmanAuthenticationManagerFactory::getInstance()->createAuthenticationManager();
			if ( $wpMailAuthManager->isAccessTokenExpired() ) {
				$this->logger->debug( 'Access Token has expired, attempting refresh' );
				$wpMailAuthManager->refreshToken();
				$authorizationToken->save();
			}
		}

		/**
		 * Aggregates all the content into a Message to be sent to the MailEngine
		 *
		 * @param mixed $to
		 * @param mixed $subject
		 * @param mixed $body
		 * @param mixed $headers
		 * @param mixed $attachments
		 */
		private function populateMessageFromWpMailParams( PostmanMessage $message, $to, $subject, $body, $headers, $attachments ) {
			$message->addHeaders( $headers );
			$message->setBody( $body );
			$message->setSubject( $subject );
			$message->addTo( $to );
			$message->setAttachments( $attachments );
			return $message;
		}

		/**
		 * Trace the parameters to aid in debugging
		 *
		 * @param mixed $to
		 * @param mixed $subject
		 * @param mixed $body
		 * @param mixed $headers
		 * @param mixed $attachments
		 */
		private function traceParameters( $to, $subject, $message, $headers, $attachments ) {
			$this->logger->trace( 'to:' );
			$this->logger->trace( $to );
			$this->logger->trace( 'subject:' );
			$this->logger->trace( $subject );
			$this->logger->trace( 'headers:' );
			$this->logger->trace( $headers );
			$this->logger->trace( 'attachments:' );
			$this->logger->trace( $attachments );
			$this->logger->trace( 'message:' );
			$this->logger->trace( $message );
		}
	}
}