<?php
// Swift Mailer v5.2.2
// http://swiftmailer.org/
// https://github.com/swiftmailer/swiftmailer

use \Inpsyde\BackWPupShared\File\MimeTypeExtractor;

class BackWPup_Destination_Email extends BackWPup_Destinations {

	/**
	 * @return array
	 */
	public function option_defaults() {

		$default                      = array();
		$default['emailaddress']      = sanitize_email( get_bloginfo( 'admin_email' ) );
		$default['emailefilesize']    = 20;
		$default['emailsndemail']     = sanitize_email( get_bloginfo( 'admin_email' ) );
		$default['emailsndemailname'] = 'BackWPup ' . get_bloginfo( 'name' );
		$default['emailmethod']       = '';
		$default['emailsendmail']     = ini_get( 'sendmail_path' );
		$default['emailhost']         = isset( $_SERVER['SERVER_NAME'] ) ? $_SERVER['SERVER_NAME'] : '';
		$default['emailhostport']     = 25;
		$default['emailsecure']       = '';
		$default['emailuser']         = '';
		$default['emailpass']         = '';

		return $default;
	}


	/**
	 * @param $jobid
	 */
	public function edit_tab( $jobid ) {

		?>
		<h3 class="title"><?php esc_html_e( 'Email address', 'backwpup' ); ?></h3>
		<table class="form-table">
			<tr>
				<th scope="row"><label
						for="emailaddress"><?php esc_html_e( 'To email address (separate with commas for multiple addresses)', 'backwpup' ); ?></label>
				</th>
				<td>
					<input name="emailaddress" id="emailaddress" type="text"
					       value="<?php echo esc_attr( BackWPup_Option::get( $jobid, 'emailaddress' ) ); ?>"
					       class="regular-text"/>
				</td>
			</tr>
			<tr>
				<th scope="row"><label for="sendemailtest"><?php esc_html_e( 'Send test email', 'backwpup' ); ?></label>
				</th>
				<td>
					<button id="sendemailtest"
					        class="button secondary"><?php esc_html_e( 'Send test email', 'backwpup' ); ?></button>
				</td>
			</tr>
		</table>

		<h3 class="title"><?php esc_html_e( 'Send email settings', 'backwpup' ); ?></h3>
		<table class="form-table">
			<tr>
				<th scope="row"><label
						for="idemailefilesize"><?php esc_html_e( 'Maximum file size', 'backwpup' ); ?></label></th>
				<td>
					<input id="idemailefilesize" name="emailefilesize" type="number" min="0" step="1"
					       value="<?php echo esc_attr( BackWPup_Option::get( $jobid, 'emailefilesize' ) ); ?>"
					       class="small-text"/><?php esc_html_e( 'MB', 'backwpup' ); ?>
                    <p class="description">
                        <?php esc_html_e(
                            'Maximum file size to be included in an email. 0 = unlimited',
                            'backwpup'
                        ); ?><br/>
                        <strong><?php esc_html_e( 'Note', 'backwpup' ); ?></strong>: <?php esc_html_e(
                            'Every email provider has different allowed attachment file sizes. If the backup archive exceeds this limit, the email will not be sent.',
                            'backwpup'
                        ); ?><br/>
                        <?php esc_html_e( 'The recommended value is 20 MB.', 'backwpup' ); ?>
                    </p>
				</td>
			</tr>
			<tr>
				<th scope="row"><label
						for="emailsndemail"><?php esc_html_e( 'From email address', 'backwpup' ); ?></label></th>
				<td>
					<input name="emailsndemail" type="text" id="emailsndemail"
					       value="<?php echo esc_attr( BackWPup_Option::get( $jobid, 'emailsndemail' ) ); ?>"
					       class="regular-text"/>
				</td>
			</tr>
			<tr>
				<th scope="row"><label for="emailsndemailname"><?php esc_html_e( 'From name', 'backwpup' ); ?></label>
				</th>
				<td>
					<input name="emailsndemailname" type="text" id="emailsndemailname"
					       value="<?php echo esc_attr( BackWPup_Option::get( $jobid, 'emailsndemailname' ) ); ?>"
					       class="regular-text"/>
				</td>
			</tr>
			<tr>
				<th scope="row"><label for="emailmethod"><?php esc_html_e( 'Sending method', 'backwpup' ); ?></label>
				</th>
				<td>
					<select id="emailmethod" name="emailmethod">
						<?php
						echo '<option value=""' . selected( '', BackWPup_Option::get( $jobid, 'emailmethod' ), false ) . '>' . esc_html__( 'Use WordPress settings', 'backwpup' ) . '</option>';
						echo '<option value="mail"' . selected( 'mail', BackWPup_Option::get( $jobid, 'emailmethod' ), false ) . '>' . esc_html__( 'PHP: mail()', 'backwpup' ) . '</option>';
						echo '<option value="sendmail"' . selected( 'sendmail', BackWPup_Option::get( $jobid, 'emailmethod' ), false ) . '>' . esc_html__( 'Sendmail', 'backwpup' ) . '</option>';
						echo '<option value="smtp"' . selected( 'smtp', BackWPup_Option::get( $jobid, 'emailmethod' ), false ) . '>' . esc_html__( 'SMTP', 'backwpup' ) . '</option>';
						?>
					</select>
				</td>
			</tr>
			<tr id="emailsendmail" <?php if ( BackWPup_Option::get( $jobid, 'emailmethod' ) !== 'sendmail' ) {
				echo 'style="display:none;"';
			} ?>>
				<th scope="row"><label for="emailsendmail"><?php esc_html_e( 'Sendmail path', 'backwpup' ); ?></label>
				</th>
				<td>
					<input name="emailsendmail" id="emailsendmail" type="text"
					       value="<?php echo esc_attr( BackWPup_Option::get( $jobid, 'emailsendmail' ) ); ?>"
					       class="regular-text code"/>
				</td>
			</tr>
			<tr class="emailsmtp" <?php if ( BackWPup_Option::get( $jobid, 'emailmethod' ) !== 'smtp' ) {
				echo 'style="display:none;"';
			} ?>>
				<th scope="row"><label for="emailhost"><?php esc_html_e( 'SMTP host name', 'backwpup' ); ?></label></th>
				<td>
					<input name="emailhost" id="emailhost" type="text"
					       value="<?php echo esc_attr( BackWPup_Option::get( $jobid, 'emailhost' ) ); ?>"
					       class="regular-text code"/>&nbsp;
					<label for="emailhostport"><?php esc_html_e( 'Port:', 'backwpup' ); ?><input name="emailhostport"
					                                                                             id="emailhostport"
					                                                                             type="number" step="0"
					                                                                             min="1" max="65000"
					                                                                             value="<?php echo esc_attr( BackWPup_Option::get( $jobid, 'emailhostport' ) ); ?>"
					                                                                             class="small-text code"/></label>
				</td>
			</tr>
			<tr class="emailsmtp" <?php if ( BackWPup_Option::get( $jobid, 'emailmethod' ) !== 'smtp' ) {
				echo 'style="display:none;"';
			} ?>>
				<th scope="row"><label
						for="emailsecure"><?php esc_html_e( 'SMTP secure connection', 'backwpup' ); ?></label>
				</th>
				<td>
					<select id="emailsecure" name="emailsecure">
						<option
							value=""<?php selected( '', BackWPup_Option::get( $jobid, 'emailsecure' ), true ); ?>><?php esc_html_e( 'none', 'backwpup' ); ?></option>
						<option
							value="ssl"<?php selected( 'ssl', BackWPup_Option::get( $jobid, 'emailsecure' ), true ); ?>><?php esc_html_e( 'SSL', 'backwpup' ); ?></option>
						<option
							value="tls"<?php selected( 'tls', BackWPup_Option::get( $jobid, 'emailsecure' ), true ); ?>><?php esc_html_e( 'TLS', 'backwpup' ); ?></option>
					</select>
				</td>
			</tr>
			<tr class="emailsmtp" <?php if ( BackWPup_Option::get( $jobid, 'emailmethod' ) !== 'smtp' ) {
				echo 'style="display:none;"';
			} ?>>
				<th scope="row"><label for="emailuser"><?php esc_html_e( 'SMTP username', 'backwpup' ); ?></label></th>
				<td>
					<input name="emailuser" id="emailuser" type="text"
					       value="<?php echo esc_attr( BackWPup_Option::get( $jobid, 'emailuser' ) ); ?>"
					       class="regular-text" autocomplete="off"/>
				</td>
			</tr>
			<tr class="emailsmtp" <?php if ( BackWPup_Option::get( $jobid, 'emailmethod' ) != 'smtp' ) {
				echo 'style="display:none;"';
			} ?>>
				<th scope="row"><label for="emailpass"><?php esc_html_e( 'SMTP password', 'backwpup' ); ?></label></th>
				<td>
					<input name="emailpass" id="emailpass" type="password"
					       value="<?php echo esc_attr( BackWPup_Encryption::decrypt( BackWPup_Option::get( $jobid, 'emailpass' ) ) ); ?>"
					       class="regular-text" autocomplete="off"/>
				</td>
			</tr>
		</table>
		<?php
	}


	public function edit_inline_js() {

		?>
		<script type="text/javascript">
			jQuery( document ).ready( function ( $ ) {
				$( '#emailmethod' ).change( function () {
					if ( 'smtp' == $( '#emailmethod' ).val() ) {
						$( '.emailsmtp' ).show();
						$( '#emailsendmail' ).hide();
					} else if ( 'sendmail' == $( '#emailmethod' ).val() ) {
						$( '.emailsmtp' ).hide();
						$( '#emailsendmail' ).show();
					} else {
						$( '.emailsmtp' ).hide();
						$( '#emailsendmail' ).hide();
					}
				} );
				$( '#sendemailtest' ).live( 'click', function () {
					$( '#sendemailtest' ).after( '&nbsp;<img id="emailsendtext" src="<?php echo get_admin_url() . 'images/loading.gif'; ?>" width="16" height="16" />' );
					var data = {
						action           : 'backwpup_dest_email',
						emailaddress     : $( 'input[name="emailaddress"]' ).val(),
						emailsndemail    : $( 'input[name="emailsndemail"]' ).val(),
						emailmethod      : $( '#emailmethod' ).val(),
						emailsendmail    : $( 'input[name="emailsendmail"]' ).val(),
						emailsndemailname: $( 'input[name="emailsndemailname"]' ).val(),
						emailhost        : $( 'input[name="emailhost"]' ).val(),
						emailhostport    : $( 'input[name="emailhostport"]' ).val(),
						emailsecure      : $( '#emailsecure' ).val(),
						emailuser        : $( 'input[name="emailuser"]' ).val(),
						emailpass        : $( 'input[name="emailpass"]' ).val(),
						_ajax_nonce      : $( '#backwpupajaxnonce' ).val()
					};
					$.post( ajaxurl, data, function ( response ) {
						$( '#emailsendtext' ).replaceWith( response );
					} );
					return false;
				} );
			} );
		</script>
		<?php
	}

	/**
	 * @param $jobid
	 */
	public function edit_form_post_save( $jobid ) {

		BackWPup_Option::update( $jobid, 'emailaddress', isset( $_POST['emailaddress'] ) ? implode( ', ', $this->get_email_array( $_POST['emailaddress'] ) ) : '' );
		BackWPup_Option::update( $jobid, 'emailefilesize', ! empty( $_POST['emailefilesize'] ) ? absint( $_POST['emailefilesize'] ) : 0 );
		BackWPup_Option::update( $jobid, 'emailsndemail', sanitize_email( $_POST['emailsndemail'] ) );
		BackWPup_Option::update( $jobid, 'emailmethod', ( $_POST['emailmethod'] === '' || $_POST['emailmethod'] === 'mail' || $_POST['emailmethod'] === 'sendmail' || $_POST['emailmethod'] === 'smtp' ) ? $_POST['emailmethod'] : '' );
		BackWPup_Option::update( $jobid, 'emailsendmail', sanitize_text_field( $_POST['emailsendmail'] ) );
		BackWPup_Option::update( $jobid, 'emailsndemailname', sanitize_text_field( $_POST['emailsndemailname'] ) );
		BackWPup_Option::update( $jobid, 'emailhost', sanitize_text_field( $_POST['emailhost'] ) );
		BackWPup_Option::update( $jobid, 'emailhostport', absint( $_POST['emailhostport'] ) );
		BackWPup_Option::update( $jobid, 'emailsecure', ( $_POST['emailsecure'] === 'ssl' || $_POST['emailsecure'] === 'tls' ) ? $_POST['emailsecure'] : '' );
		BackWPup_Option::update( $jobid, 'emailuser', sanitize_text_field( $_POST['emailuser'] ) );
		BackWPup_Option::update( $jobid, 'emailpass', BackWPup_Encryption::encrypt( $_POST['emailpass'] ) );
	}

	/**
	 * @param $job_object
	 *
	 * @return bool
	 */
	public function job_run_archive( BackWPup_Job $job_object ) {

		$job_object->substeps_todo = 1;
		$job_object->log( sprintf( __( '%d. Try to send backup with email&#160;&hellip;', 'backwpup' ), $job_object->steps_data[ $job_object->step_working ]['STEP_TRY'] ), E_USER_NOTICE );

		//check file Size
		if ( ! empty( $job_object->job['emailefilesize'] ) ) {
			if ( $job_object->backup_filesize > $job_object->job['emailefilesize'] * 1024 * 1024 ) {
				$job_object->log( __( 'Backup archive too big to be sent by email!', 'backwpup' ), E_USER_ERROR );
				$job_object->substeps_done = 1;

				return true;
			}
		}

		$job_object->log( sprintf( __( 'Sending email to %s&hellip;', 'backwpup' ), $job_object->job['emailaddress'] ), E_USER_NOTICE );

		//get mail settings
		$emailmethod   = 'mail';
		$emailsendmail = '';
		$emailhost     = '';
		$emailhostport = '';
		$emailsecure   = '';
		$emailuser     = '';
		$emailpass     = '';

		if (empty($job_object->job['emailmethod'])) {
            //do so if i'm the wp_mail to get the settings
            $phpmailer = $this->getPhpMailer();

            //only if PHPMailer really used
            if (is_object($phpmailer)) {
                do_action_ref_array('phpmailer_init', [&$phpmailer]);
                //get settings from PHPMailer
                $emailmethod = $phpmailer->Mailer;
                $emailsendmail = $phpmailer->Sendmail;
                $emailhost = $phpmailer->Host;
                $emailhostport = $phpmailer->Port;
                $emailsecure = $phpmailer->SMTPSecure;
                $emailuser = $phpmailer->Username;
                $emailpass = $phpmailer->Password;
            }
        } else {
            $emailmethod = $job_object->job['emailmethod'];
            $emailsendmail = $job_object->job['emailsendmail'];
            $emailhost = $job_object->job['emailhost'];
            $emailhostport = $job_object->job['emailhostport'];
            $emailsecure = $job_object->job['emailsecure'];
            $emailuser = $job_object->job['emailuser'];
            $emailpass = BackWPup_Encryption::decrypt($job_object->job['emailpass']);
        }

		//Generate mail with Swift Mailer
		if ( ! class_exists( 'Swift', false ) ) {
			require BackWPup::get_plugin_data( 'plugindir' ) . '/vendor/SwiftMailer/swift_required.php';
		}

		if ( function_exists( 'mb_internal_encoding' ) && ( (int) ini_get( 'mbstring.func_overload' ) ) & 2 ) {
			$mbEncoding = mb_internal_encoding();
			mb_internal_encoding( 'ASCII' );
		}

		try {
			//Set Temp dir for mailing
			Swift_Preferences::getInstance()->setTempDir( untrailingslashit( BackWPup::get_plugin_data( 'TEMP' ) ) )->setCacheType( 'disk' );
			// Create the Transport
			if ( $emailmethod == 'smtp' ) {
				$transport = Swift_SmtpTransport::newInstance( $emailhost, $emailhostport );
				if ( $emailuser ) {
					$transport->setUsername( $emailuser );
					$transport->setPassword( $emailpass );
				}
				if ( $emailsecure == 'ssl' ) {
					$transport->setEncryption( 'ssl' );
				}
				if ( $emailsecure == 'tls' ) {
					$transport->setEncryption( 'tls' );
				}
			} elseif ( $emailmethod == 'sendmail' ) {
				$transport = Swift_SendmailTransport::newInstance( $emailsendmail );
			} else {
				$job_object->need_free_memory( $job_object->backup_filesize * 8 );
				$transport = Swift_MailTransport::newInstance();
			}
			// Create the Mailer using your created Transport
			$emailer = Swift_Mailer::newInstance( $transport );

			// Create a message
			$message = Swift_Message::newInstance( sprintf( __( 'BackWPup archive from %1$s: %2$s', 'backwpup' ), date_i18n( 'd-M-Y H:i', $job_object->start_time, true ), esc_attr( $job_object->job['name'] ) ) );
			$message->setFrom( array( $job_object->job['emailsndemail'] => $job_object->job['emailsndemailname'] ) );
			$message->setTo( $this->get_email_array( $job_object->job['emailaddress'] ) );
			$message->setBody( sprintf( __( 'Backup archive: %s', 'backwpup' ), $job_object->backup_file ), 'text/plain', strtolower( get_bloginfo( 'charset' ) ) );
			$message->attach( Swift_Attachment::fromPath( $job_object->backup_folder . $job_object->backup_file, MimeTypeExtractor::fromFilePath( $job_object->backup_folder . $job_object->backup_file ) ) );
			// Send the message
			$result = $emailer->send( $message );
		} catch ( Exception $e ) {
			$job_object->log( 'Swift Mailer: ' . $e->getMessage(), E_USER_ERROR );
		}

		if ( isset( $mbEncoding ) ) {
			mb_internal_encoding( $mbEncoding );
		}

		if ( ! isset( $result ) || ! $result ) {
			$job_object->log( __( 'Error while sending email!', 'backwpup' ), E_USER_ERROR );

			return false;
		} else {
			$job_object->substeps_done = 1;
			$job_object->log( __( 'Email sent.', 'backwpup' ), E_USER_NOTICE );

			return true;
		}
	}

	/**
	 * @param $job_settings
	 *
	 * @return bool
	 */
	public function can_run( array $job_settings ) {

		if ( empty( $job_settings['emailaddress'] ) ) {
			return false;
		}

		if ( $job_settings['backuptype'] != 'archive' ) {
			return false;
		}

		return true;
	}


	/**
	 * sends test mail
	 */
	public function edit_ajax() {

		check_ajax_referer( 'backwpup_ajax_nonce' );

		//get mail settings
		$emailmethod   = 'mail';
		$emailsendmail = '';
		$emailhost     = '';
		$emailhostport = '';
		$emailsecure   = '';
		$emailuser     = '';
		$emailpass     = '';

		if ( empty( $_POST['emailmethod'] ) ) {
			//do so if i'm the wp_mail to get the settings
            $phpmailer = $this->getPhpMailer();

			//only if PHPMailer really used
			if ( is_object( $phpmailer ) ) {
				do_action_ref_array( 'phpmailer_init', array( &$phpmailer ) );
				//get settings from PHPMailer
				$emailmethod   = $phpmailer->Mailer;
				$emailsendmail = $phpmailer->Sendmail;
				$emailhost     = $phpmailer->Host;
				$emailhostport = $phpmailer->Port;
				$emailsecure   = $phpmailer->SMTPSecure;
				$emailuser     = $phpmailer->Username;
				$emailpass     = $phpmailer->Password;
			}
		} else {
			$emailmethod   = sanitize_text_field( $_POST['emailmethod'] );
			$emailsendmail = sanitize_email( $_POST['emailsendmail'] );
			$emailhost     = sanitize_text_field( $_POST['emailhost'] );
			$emailhostport = absint( $_POST['emailhostport'] );
			$emailsecure   = sanitize_text_field( $_POST['emailsecure'] );
			$emailuser     = sanitize_text_field( $_POST['emailuser'] );
			$emailpass     = BackWPup_Encryption::decrypt( $_POST['emailpass'] );
		}

		//Generate mail with Swift Mailer
		if ( ! class_exists( 'Swift', false ) ) {
			require BackWPup::get_plugin_data( 'plugindir' ) . '/vendor/SwiftMailer/swift_required.php';
		}

		if ( function_exists( 'mb_internal_encoding' ) && ( (int) ini_get( 'mbstring.func_overload' ) ) & 2 ) {
			$mbEncoding = mb_internal_encoding();
			mb_internal_encoding( 'ASCII' );
		}

		try {
			// Create the Transport
			if ( $emailmethod == 'smtp' ) {
				$transport = Swift_SmtpTransport::newInstance( $emailhost, $emailhostport );
				if ( $emailuser ) {
					$transport->setUsername( $emailuser );
					$transport->setPassword( $emailpass );
				}
				if ( $emailsecure == 'ssl' ) {
					$transport->setEncryption( 'ssl' );
				}
				if ( $emailsecure == 'tls' ) {
					$transport->setEncryption( 'tls' );
				}
			} elseif ( $emailmethod == 'sendmail' ) {
				$transport = Swift_SendmailTransport::newInstance( $emailsendmail );
			} else {
				$transport = Swift_MailTransport::newInstance();
			}
			// Create the Mailer using your created Transport
			$emailer = Swift_Mailer::newInstance( $transport );

			// Create a message
			$message = Swift_Message::newInstance( __( 'BackWPup archive sending TEST Message', 'backwpup' ) );
			$message->setFrom( array( $_POST['emailsndemail'] => sanitize_email( $_POST['emailsndemailname'] ) ) );
			$message->setTo( $this->get_email_array( $_POST['emailaddress'] ) );
			$message->setBody( __( 'If this message reaches your inbox, sending backup archives via email should work for you.', 'backwpup' ) );
			// Send the message
			$result = $emailer->send( $message );
		} catch ( Exception $e ) {
			echo '<span id="emailsendtext" class="bwu-message-error">Swift Mailer: ' . $e->getMessage() . '</span>';
		}

		if ( isset( $mbEncoding ) ) {
			mb_internal_encoding( $mbEncoding );
		}

		if ( ! isset( $result ) || ! $result ) {
			echo '<span id="emailsendtext" class="bwu-message-error">' . esc_html__( 'Error while sending email!', 'backwpup' ) . '</span>';
		} else {
			echo '<span id="emailsendtext" class="bwu-message-success">' . esc_html__( 'Email sent.', 'backwpup' ) . '</span>';
		}
		die();
	}

	/**
	 * Get an array of emails from comma-separated string.
	 *
	 * @param string $emailString
	 *
	 * @return array
	 */
	private function get_email_array( $emailString ) {

		$emails = explode( ',', sanitize_text_field( $emailString ) );

		foreach ( $emails as $key => $email ) {
			$emails[ $key ] = sanitize_email( trim( $email ) );
			if ( ! is_email( $emails[ $key ] ) ) {
				unset( $emails[ $key ] );
			}
		}

		return $emails;
	}

    /**
     * @return PHPMailer|\PHPMailer\PHPMailer\PHPMailer
     */
    private function getPhpMailer()
    {
        global $phpmailer;
        if (!is_object($phpmailer) || !$phpmailer instanceof PHPMailer) {

            global $wp_version;
            if (version_compare($wp_version, '5.5', '>=')) {

                require_once ABSPATH . WPINC . '/PHPMailer/PHPMailer.php';
                require_once ABSPATH . WPINC . '/PHPMailer/Exception.php';

                return new PHPMailer\PHPMailer\PHPMailer();
            }

            require_once ABSPATH . WPINC . '/class-phpmailer.php';
            require_once ABSPATH . WPINC . '/class-smtp.php';

            return new PHPMailer(true);
        }

        return $phpmailer;
    }
}
