<?php

class MailsterAjax {

	// all methods which require a certain capability
	private $methods = array(

		// edit screen
		'get_template'                => 'edit_newsletter',
		'get_plaintext'               => 'edit_newsletter',
		'create_new_template'         => 'mailster_edit_templates',
		'create_new_module'           => 'mailster_edit_templates',
		'delete_module'               => 'mailster_change_template',
		'toggle_codeview'             => 'mailster_see_codeview',
		'set_preview'                 => 'edit_newsletter',
		'get_preview'                 => 'edit_newsletter',
		'precheck'                    => 'edit_newsletter',
		'precheck_result'             => 'edit_newsletter',
		'precheck_agree'              => 'edit_newsletter',
		'search_subscribers'          => 'mailster_manage_subscribers',
		'send_test'                   => 'edit_newsletter',
		'health_check'                => 'edit_newsletter',
		'get_list_counts'             => 'edit_newsletter',
		'get_totals'                  => 'edit_newsletter',
		'get_totals_list'             => 'edit_newsletter',
		'get_totals_list_part'        => 'edit_newsletter',
		'save_color_schema'           => 'edit_newsletter',
		'delete_color_schema'         => 'edit_newsletter',
		'delete_color_schema_all'     => 'edit_newsletter',
		'get_recipients'              => 'edit_newsletter',
		'get_recipients_page'         => 'edit_newsletter',
		'get_recipient_detail'        => 'edit_newsletter',
		'get_clicks'                  => 'edit_newsletter',
		'get_errors'                  => 'edit_newsletter',
		'get_environment'             => 'edit_newsletter',
		'get_geolocation'             => 'edit_newsletter',
		'get_post_term_dropdown'      => 'edit_newsletter',
		'check_for_posts'             => 'edit_newsletter',
		'create_image'                => 'edit_newsletter',
		'get_post_list'               => 'edit_newsletter',
		'get_post'                    => 'edit_newsletter',

		'get_file_list'               => 'edit_newsletter',
		'get_template_html'           => 'edit_newsletter',
		'set_template_html'           => 'mailster_save_template',

		'notice_dismiss'              => 'read',

		// settings
		'load_geo_data'               => 'manage_options',
		'get_fallback_images'         => 'manage_options',
		'bounce_test'                 => 'manage_options',
		'bounce_test_check'           => 'manage_options',
		'get_system_info'             => 'manage_options',
		'get_gravatar'                => 'manage_options',
		'check_email'                 => 'manage_options',
		'spf_check'                   => 'manage_options',
		'dkim_check'                  => 'manage_options',

		'sync_all_subscriber'         => 'manage_options',
		'sync_all_wp_user'            => 'manage_options',

		'create_list'                 => 'mailster_edit_lists',
		'get_create_list_count'       => 'mailster_edit_lists',

		'get_subscriber_count'        => 'edit_newsletter',

		'editor_image_upload_handler' => 'edit_newsletter',
		'template_upload_handler'     => 'mailster_upload_templates',

		'query_templates'             => 'mailster_manage_templates',
		'delete_template'             => 'mailster_delete_templates',
		'download_template'           => 'mailster_manage_templates',
		'default_template'            => 'mailster_manage_templates',
		'template_endpoint'           => 'mailster_manage_templates',
		'load_template_file'          => 'mailster_edit_templates',

		'query_addons'                => 'mailster_manage_addons',

		// dashboard
		'get_dashboard_data'          => 'mailster_dashboard',
		'get_dashboard_chart'         => 'mailster_dashboard',

		'convert'                     => 'mailster_dashboard',
		'envato_verify'               => 'mailster_dashboard',
		'check_for_update'            => 'mailster_dashboard',
		'check_language'              => 'mailster_dashboard',
		'load_language'               => 'mailster_dashboard',
		'quick_install'               => 'mailster_dashboard',
		'wizard_save'                 => 'mailster_dashboard',

		'get_autocomplete_source'     => 'edit_newsletter',

		'test'                        => 'manage_options',
		'get_beacon_data'             => 'read',

	);

	private $methods_no_priv = array(
		'image_placeholder',
		'forward_message',
		'subscribe',
		'update',
		'unsubscribe',
		'form_submit',
		'profile_submit',
		'form_unsubscribe',
		'form_css',
	);

	public function __construct() {

		if ( ! defined( 'DOING_AJAX' ) || ! DOING_AJAX ) {
			return;
		}

		foreach ( $this->methods as $method => $cap ) {

			add_action( 'wp_ajax_mailster_' . $method, array( &$this, 'call_method' ) );

		}

		foreach ( $this->methods_no_priv as $method ) {

			add_action( 'wp_ajax_mailster_' . $method, array( &$this, 'call_method' ) );
			add_action( 'wp_ajax_nopriv_mailster_' . $method, array( &$this, 'call_method' ) );

		}
	}

	public function add_ajax_nonce() {
		wp_nonce_field( 'mailster_nonce', 'mailster_nonce', false );
	}


	public function call_method() {

		$method_name = str_replace( array( 'wp_ajax_mailster_', 'wp_ajax_nopriv_mailster_' ), '', current_filter() );

		if ( method_exists( $this, $method_name ) ) {
			$capability = isset( $this->methods[ $method_name ] ) ? $this->methods[ $method_name ] : null;
			$post_id    = isset( $_REQUEST['id'] ) ? (int) $_REQUEST['id'] : null;
			$args       = func_get_args();

			// method requires a capability
			if ( $capability && ! current_user_can( $capability, $post_id ) ) {
				die( 'You are not allowed to do this action.' );
			}
			call_user_func_array( array( $this, $method_name ), $args );
		} else {
			die( sprintf( 'Method %s does not exist!', $method ) );
		}
	}


	public function ajax_nonce( $return = null, $nonce = 'mailster_nonce' ) {
		if ( ! wp_verify_nonce( $_REQUEST['_wpnonce'], $nonce ) ) {
			if ( is_null( $return ) ) {
				$return = esc_html__( 'Your nonce is expired! Please reload the site.', 'mailster' );
			}
			if ( is_string( $return ) ) {
				wp_die( $return );
			} else {
				die( $return );
			}
		}
	}


	public function form_css() {
		_deprecated_function( __FUNCTION__, '2.2' );
	}


	private function submit() {

		set_query_var( '_mailster', 'subscribe' );

		mailster( 'form' )->submit();
	}


	private function update() {

		mailster( 'form' )->update();
	}


	private function unsubscribe() {

		mailster( 'form' )->unsubscribe();
	}


	private function form_submit() {

		$this->submit();
	}


	private function profile_submit() {

		$this->update();
	}


	private function form_unsubscribe() {

		$this->unsubscribe();
	}


	private function get_plaintext() {

		$this->ajax_nonce();

		$html = isset( $_POST['html'] ) ? stripslashes( $_POST['html'] ) : '';

		$html = mailster()->sanitize_content( $html );

		$html = mailster( 'helper' )->plain_text( $html );

		echo $html;

		exit;
	}


	private function get_template() {

		$this->ajax_nonce();

		error_reporting( 0 );

		$id          = (int) $_GET['id'];
		$template    = basename( $_GET['template'] );
		$file        = isset( $_GET['templatefile'] ) ? basename( $_GET['templatefile'] ) : 'index.html';
		$editorstyle = isset( $_GET['editorstyle'] ) && '1' == $_GET['editorstyle'];

		global $post, $post_id;
		$post = get_post( $id, OBJECT );
		setup_postdata( $post );
		$post_id = $post->ID;

		$meta = mailster( 'campaigns' )->meta( $id );
		$head = isset( $meta['head'] ) ? $meta['head'] : null;

		if ( ! isset( $meta['file'] ) ) {
			$meta['file'] = 'index.html';
		}

		// template has been changed
		if ( ! isset( $meta['template'] ) || $template != $meta['template'] || $file != $meta['file'] ) {
			$html = mailster( 'campaigns' )->get_template_by_slug( $template, $file, false, $editorstyle );
		} else {
			$html = mailster( 'campaigns' )->get_template_by_id( $id, $file, false, $editorstyle );
		}

		if ( ! $editorstyle ) {
			$revision = isset( $_REQUEST['revision'] ) ? (int) $_REQUEST['revision'] : false;
			$campaign = get_post( $id );
			$subject  = isset( $_REQUEST['subject'] ) ? esc_attr( $_REQUEST['subject'] ) : ( isset( $meta['subject'] ) ? esc_attr( $meta['subject'] ) : '' );

			$current_user = wp_get_current_user();

			if ( $revision ) {
				$revision = get_post( $revision );
				$html     = mailster()->sanitize_content( $revision->post_content, $head );
			}

			$placeholder = mailster( 'placeholder', $html );

			$placeholder->do_conditions( false );

			$placeholder->set_campaign( $campaign->ID );

			$placeholder->remove_last_post_args();

			$placeholder->add_defaults(
				$campaign->ID,
				array(
					'subject' => $subject,
				)
			);
			$placeholder->add_custom(
				$campaign->ID,
				array(
					'emailaddress' => $current_user->user_email,
				)
			);

			if ( 0 != $current_user->ID ) {
				$firstname = ( $current_user->user_firstname ) ? $current_user->user_firstname : $current_user->display_name;
			}

			$suffix = SCRIPT_DEBUG ? '' : '.min';
			$html   = $placeholder->get_content( true );
			$html   = str_replace( '</head>', '<link rel="stylesheet" id="template-style" href="' . MAILSTER_URI . 'assets/css/template-style' . $suffix . '.css?ver=' . MAILSTER_VERSION . '" type="text/css" media="all"></head>', $html );
		}

		$replace = array(
			'//dummy.newsletter-plugin.com' => '//dummy.mailster.co',
		);
		$replace = apply_filters( 'mailster_get_template_replace', $replace );

		$html = strtr( $html, $replace );
		echo $html;

		exit;
	}


	private function create_new_template() {

		$this->ajax_nonce();

		$this->ajax_filesystem();

		$head    = isset( $_POST['head'] ) ? stripslashes( $_POST['head'] ) : null;
		$content = isset( $_POST['content'] ) ? stripslashes( $_POST['content'] ) : null;

		$content = mailster()->sanitize_content( $content, $head );

		$name          = esc_attr( $_POST['name'] );
		$template      = esc_attr( $_POST['template'] );
		$modules       = (bool) ( $_POST['modules'] === 'true' );
		$activemodules = (bool) ( $_POST['activemodules'] === 'true' );
		$overwrite     = $_POST['overwrite'] === 'false' ? false : $_POST['overwrite'];

		$t        = mailster( 'template', $template );
		$filename = $t->create_new( $name, $content, $modules, $activemodules, $overwrite );

		$return = array();

		if ( $filename !== false ) {
			$return['url'] = add_query_arg(
				array(
					'template' => $template,
					'file'     => $filename,
					'message'  => 3,
				),
				mailster_get_referer()
			);
		} else {
			$return['msg'] = esc_html__( 'Unable to save template!', 'mailster' );
			wp_send_json_error( $return );
		}

		wp_send_json_success( $return );
	}

	private function create_new_module() {

		$this->ajax_nonce();

		$this->ajax_filesystem();

		$name     = stripslashes( $_POST['name'] );
		$template = stripslashes( $_POST['template'] );
		$file     = stripslashes( $_POST['file'] );
		$content  = isset( $_POST['content'] ) ? stripslashes( $_POST['content'] ) : null;
		$auto     = $_POST['auto'] === 'false' ? false : true;

		$t        = mailster( 'template', $template, $file );
		$filename = $t->add_module( $name, $content, $auto );

		$return = array();
		if ( ! $filename ) {
			$return['msg'] = esc_html__( 'Unable to save template!', 'mailster' );
			wp_send_json_success( $return );
			exit;
		}

		$t->reload( true );
		$modules = $t->get_modules_list();
		$html    = '';
		foreach ( $modules as $module ) {
			$html .= $module['module'];
		}
		$return['html'] = $html;
		wp_send_json_success( $return );
	}


	private function delete_module() {

		$this->ajax_nonce();

		$this->ajax_filesystem();

		$id       = stripslashes( $_POST['id'] );
		$template = stripslashes( $_POST['template'] );
		$file     = stripslashes( $_POST['file'] );

		$t = mailster( 'template', $template, $file, true );
		if ( $t->delete_module( $id ) ) {
			wp_send_json_success();
		} else {
			wp_send_json_error();
		}
	}


	private function toggle_codeview() {

		$this->ajax_nonce();

		$head           = isset( $_POST['head'] ) ? stripslashes( $_POST['head'] ) : null;
		$bodyattributes = isset( $_POST['bodyattributes'] ) ? stripslashes( $_POST['bodyattributes'] ) : '';
		$content        = isset( $_POST['content'] ) ? '<body' . $bodyattributes . '>' . stripslashes( $_POST['content'] ) . '</body>' : null;

		$return['content'] = mailster()->sanitize_content( $content, $head );
		$return['style']   = mailster( 'helper' )->get_mailster_styles();
		wp_send_json_success( $return );
	}


	private function set_preview() {

		$this->ajax_nonce();

		$content       = isset( $_POST['content'] ) ? stripslashes( $_POST['content'] ) : '';
		$ID            = isset( $_POST['id'] ) ? (int) $_POST['id'] : 0;
		$subject       = isset( $_POST['subject'] ) ? stripslashes( $_POST['subject'] ) : '';
		$preheader     = isset( $_POST['preheader'] ) ? stripslashes( $_POST['preheader'] ) : '';
		$issue         = isset( $_POST['issue'] ) ? (int) $_POST['issue'] : 1;
		$head          = isset( $_POST['head'] ) ? stripslashes( $_POST['head'] ) : null;
		$subscriber_id = isset( $_POST['subscriber_id'] ) ? (int) $_POST['subscriber_id'] : null;

		$html        = mailster()->sanitize_content( $content, $head );
		$to          = '';
		$placeholder = mailster( 'placeholder', $html );

		$placeholder->set_campaign( $ID );

		if ( $subscriber_id ) {

			if ( $subscriber = mailster( 'subscribers' )->get( $subscriber_id, true, true ) ) {

				$userdata = mailster( 'subscribers' )->get_custom_fields( $subscriber->ID );

				$placeholder->set_subscriber( $subscriber->ID );
				$placeholder->add( $userdata );

				$placeholder->add(
					array(
						'firstname'    => $subscriber->firstname,
						'lastname'     => $subscriber->lastname,
						'fullname'     => $subscriber->fullname,
						'emailaddress' => $subscriber->email,
					)
				);

				$to = $subscriber->fullname ? $subscriber->fullname . ' <' . $subscriber->email . '>' : $subscriber->email;
			}
		} else {

			$current_user = wp_get_current_user();

			$firstname = ( $current_user->user_firstname ) ? $current_user->user_firstname : $current_user->display_name;
			$fullname  = mailster_option( 'name_order' ) ? trim( $current_user->user_lastname . ' ' . $firstname ) : trim( $firstname . ' ' . $current_user->user_lastname );

			$placeholder->add(
				array(
					'firstname'    => $firstname,
					'lastname'     => $current_user->user_lastname,
					'fullname'     => $fullname,
					'emailaddress' => $current_user->user_email,
				)
			);

			$to = $fullname ? $fullname . ' <' . $current_user->user_email . '>' : $current_user->user_email;
		}

		$placeholder->add_defaults(
			$ID,
			array(
				'issue'     => $issue,
				'subject'   => $subject,
				'preheader' => $preheader,
			)
		);

		$placeholder->add_custom( $ID );

		$content = $placeholder->get_content();

		$content = mailster( 'helper' )->strip_structure_html( $content );
		$content = mailster( 'helper' )->add_mailster_styles( $content );
		$content = mailster( 'helper' )->handle_shortcodes( $content );

		$content = str_replace( '@media only screen and (max-device-width:', '@media only screen and (max-width:', $content );

		$content = str_replace( '</head>', mailster( 'precheck' )->script_styles() . '</head>', $content );
		$content = str_replace( '</body>', '<highlighterx></highlighterx><highlightery></highlightery></body>', $content );

		$hash = md5( NONCE_SALT . MAILSTER_VERSION . $content );

		// cache preview for 15 seconds
		set_transient( 'mailster_p_' . $hash, $content, 15 );

		$placeholder->set_content( $subject );
		$return['subject'] = $placeholder->get_content();
		$return['to']      = $to;
		$return['hash']    = $hash;
		$return['nonce']   = wp_create_nonce( 'mailster_nonce' );

		wp_send_json_success( $return );
	}


	private function get_preview() {

		$this->ajax_nonce();

		$hash = sanitize_key( $_GET['hash'] );

		$content = get_transient( 'mailster_p_' . $hash );

		if ( empty( $content ) ) {
			wp_die( 'There was an error creating the preview.' );
		}

		echo $content;
		exit;
	}


	private function precheck() {

		$this->ajax_nonce();

		$id = isset( $_POST['id'] ) ? sanitize_key( $_POST['id'] ) : false;

		if ( ! $id ) {
			$return['error'] = 'No such id';
			wp_send_json_error( $return );
		}

		$response = mailster( 'precheck' )->request( $id );

		if ( is_wp_error( $response ) ) {
			$return['error'] = $response->get_error_message();
			wp_send_json_error( $return );
		} else {
			$return['ready'] = $response->ready;
			wp_send_json_success( $return );
		}
	}


	private function precheck_result() {

		$this->ajax_nonce();

		$id       = isset( $_POST['id'] ) ? sanitize_key( $_POST['id'] ) : false;
		$endpoint = isset( $_POST['endpoint'] ) ? ( $_POST['endpoint'] ) : false;

		if ( ! $id ) {
			$return['error'] = 'No such id';
			wp_send_json_error( $return );
		}

		$response = mailster( 'precheck' )->request( $id, $endpoint, 25 );

		$return['part'] = basename( $endpoint );

		if ( is_wp_error( $response ) ) {
			$return['error'] = $response->get_error_message();
			wp_send_json_error( $return );
		} else {
			$return['status']  = $response->status;
			$return['points']  = $response->points;
			$return['penalty'] = $response->penalty;
			$return['html']    = mailster( 'precheck' )->convert( $response, $endpoint );
			wp_send_json_success( $return );
		}
	}


	private function precheck_agree() {

		$this->ajax_nonce();

		$current_user = wp_get_current_user();

		if ( ! update_user_meta( $current_user->ID, '_mailster_precheck_agreed', time() ) ) {
			wp_send_json_error();
		}
		wp_send_json_success();
	}


	private function search_subscribers() {

		$this->ajax_nonce();

		$id   = isset( $_POST['post_id'] ) ? (int) $_POST['post_id'] : false;
		$term = isset( $_POST['term'] ) ? ( $_POST['term'] ) : false;

		$return = array();

		if ( $term ) {
			$subscribers = mailster( 'subscribers' )->query(
				array(
					's'      => $term,
					'fields' => 'fullname,email,ID',
				),
				$id
			);

			foreach ( $subscribers as $subscriber ) {
				$label    = $subscriber->fullname ? $subscriber->fullname . ' <' . $subscriber->email . '>' : $subscriber->email;
				$return[] = array(
					'id'    => $subscriber->ID,
					'label' => '[' . $subscriber->ID . ']: ' . $label,
					'value' => $label,
				);
			}
		}

		wp_send_json( $return );
	}

	private function send_test() {

		$this->ajax_nonce(
			json_encode(
				array(
					'success' => false,
					'msg'     => esc_html__( 'Nonce invalid! Please reload site.', 'mailster' ),
				)
			)
		);

		if ( isset( $_POST['formdata'] ) ) {
			parse_str( $_POST['formdata'], $formdata );
			if ( isset( $formdata['mailster_options'] ) ) {
				mailster_update_option( $formdata['mailster_options'], true );
			}
		}

		$precheck = (bool) ( isset( $_POST['precheck'] ) && $_POST['precheck'] === 'true' );

		$to           = trim( stripslashes( $_POST['to'] ) );
		$current_user = wp_get_current_user();

		if ( ! empty( $to ) ) {
			update_user_meta( $current_user->ID, '_mailster_test_email', $to );
		}

		if ( isset( $_POST['test'] ) ) {

			$basic = (bool) ( $_POST['basic'] === 'true' );

			$n = mailster( 'notification' );
			$n->debug();
			$n->to( $to );
			$n->template( 'test' );
			$n->requeue( false );

			$success = $n->add();

			$mail = $n->mail;

			$return['log'] = $mail->get_error_log();

			$receivers = explode( ',', $to );

		} else {

			$success = true;

			$subject = stripslashes( $formdata['mailster_data']['subject'] );

			if ( $precheck ) {
				$precheck_id  = hash( 'crc32', uniqid( 1 ) ) . hash( 'crc32', uniqid( 9 ) );
				$receivers    = array( apply_filters( 'mailster_precheck_mail', 'mailster-' . $precheck_id . '@precheck.email', $precheck_id ) );
				$return['id'] = $precheck_id;
			} else {
				$receivers = explode( ',', $to );
				$subject   = apply_filters( 'mailster_send_test_subject', $subject, $receivers );
			}

			$from         = $formdata['mailster_data']['from_email'];
			$from_name    = stripslashes( $formdata['mailster_data']['from_name'] );
			$reply_to     = $formdata['mailster_data']['reply_to'];
			$embed_images = mailster_option( 'embed_images' );
			$track_opens  = isset( $formdata['mailster_data']['track_opens'] );
			$track_clicks = isset( $formdata['mailster_data']['track_clicks'] );
			$head         = stripslashes( $_POST['head'] );
			$content      = stripslashes( $_POST['content'] );
			$preheader    = stripslashes( $formdata['mailster_data']['preheader'] );
			$bouncemail   = mailster_option( 'bounce' );
			$attachments  = isset( $formdata['mailster_data']['attachments'] ) ? $formdata['mailster_data']['attachments'] : array();
			$max_size     = apply_filters( 'mailster_attachments_max_filesize', 1024 * 1024 );

			$autoplain = isset( $formdata['mailster_data']['autoplaintext'] );
			$plaintext = stripslashes( $_POST['plaintext'] );

			$MID = mailster_option( 'ID' );

			$ID            = (int) $formdata['post_ID'];
			$subscriber_id = isset( $_POST['subscriber_id'] ) ? (int) $_POST['subscriber_id'] : null;
			$issue         = $formdata['mailster_data']['autoresponder']['issue'];

			$campaign_permalink = get_permalink( $ID );

			$attach = array();

			if ( ! empty( $attachments ) ) {
				$total_size = 0;
				foreach ( (array) $attachments as $attachment_id ) {
					if ( ! $attachment_id ) {
						continue;
					}
					$file = get_attached_file( $attachment_id );
					if ( ! is_file( $file ) ) {
						continue;
					}
					$total_size += filesize( $file );
					if ( $total_size <= $max_size ) {
						$attach[ basename( $file ) ] = $file;
					} else {
						$receivers     = array();
						$success       = false;
						$return['msg'] = sprintf( esc_html__( 'Attachments must not exceed the file size limit of %s!', 'mailster' ), '<strong>' . esc_html( size_format( $max_size ) ) . '</strong>' );
					}
				}
			}

			foreach ( $receivers as $receiver ) {

				$names = null;

				$mail = mailster( 'mail' );

				$mail->to           = $receiver;
				$mail->subject      = $subject;
				$mail->from         = $from;
				$mail->from_name    = $from_name;
				$mail->reply_to     = $reply_to;
				$mail->bouncemail   = $bouncemail;
				$mail->embed_images = $embed_images;
				$mail->hash         = str_repeat( '0', 32 );

				$content = mailster()->sanitize_content( $content, $head );

				$placeholder = mailster( 'placeholder', $content );

				$mail->set_campaign( $ID );
				$placeholder->set_campaign( $ID );

				// check for subscriber by mail
				if ( ! ( $subscriber = mailster( 'subscribers' )->get( $subscriber_id, true, true ) ) ) {
					$subscriber = mailster( 'subscribers' )->get_by_mail( $receiver, true, true );
				}

				if ( $subscriber ) {

					$profilelink = mailster()->get_profile_link( $ID, $subscriber->hash );

					$userdata = mailster( 'subscribers' )->get_custom_fields( $subscriber->ID );

					$placeholder->set_subscriber( $subscriber->ID );
					$placeholder->add( $userdata );

					$names = array(
						'firstname'    => $subscriber->firstname,
						'lastname'     => $subscriber->lastname,
						'fullname'     => $subscriber->fullname,
						'emailaddress' => $subscriber->email,
					);

					$mail->set_subscriber( $subscriber->ID );
					$placeholder->set_subscriber( $subscriber->ID );

					$mail->add_header( mailster( 'campaigns' )->get_headers( $ID, $subscriber->ID ) );

				} elseif ( $current_user ) {

					$profilelink = mailster()->get_profile_link( $ID, '' );

					$firstname = $current_user->user_firstname ? $current_user->user_firstname : $current_user->display_name;
					$names     = array(
						'firstname'    => $firstname,
						'lastname'     => $current_user->user_lastname,
						'fullname'     => mailster_option( 'name_order' ) ? trim( $current_user->user_lastname . ' ' . $firstname ) : trim( $firstname . ' ' . $current_user->user_lastname ),
						'emailaddress' => $current_user->user_email,
					);

					$mail->add_header( mailster( 'campaigns' )->get_headers( $ID ) );

				} else {
					// no subscriber found for data
					$names = null;
				}

				if ( $names ) {
					$placeholder->add( $names );
				}

				if ( ! empty( $attach ) ) {
					$mail->attachments = $attach;
				}

				$placeholder->add_defaults(
					$ID,
					array(
						'issue'     => $issue,
						'subject'   => $subject,
						'preheader' => $preheader,
					)
				);

				$placeholder->add_custom( $ID );

				$content = $placeholder->get_content();
				$content = mailster( 'helper' )->prepare_content( $content );
				if ( apply_filters( 'mailster_inline_css', true, $ID, $subscriber ? $subscriber->ID : null ) ) {
					$content = mailster( 'helper' )->inline_css( $content );
				}

				// replace links with fake hash to prevent tracking, not during precheck.
				if ( $track_clicks && ! $precheck ) {
					$content = mailster()->replace_links( $content, $mail->hash, $ID );
				}

				// strip all unwanted stuff from the content
				$content = mailster( 'helper' )->strip_structure_html( $content );

				$mail->content = apply_filters( 'mailster_campaign_content', $content, get_post( $ID ), $subscriber );

				if ( ! $autoplain ) {
					$placeholder->set_content( esc_textarea( $plaintext ) );
					$mail->plaintext = mailster( 'helper' )->plain_text( $placeholder->get_content(), true );
				}

				$placeholder->set_content( $mail->subject );
				$mail->subject = $placeholder->get_content();

				$mail->add_tracking_image = $track_opens && ! $precheck;

				$success = $success && $mail->send();

				$mail->close();
			}
		}

		if ( ! isset( $return['msg'] ) ) {
			$return['msg'] = ( $success )
				? sprintf( esc_html__( 'Message sent to %s. Check your inbox!', 'mailster' ), implode( ', ', $receivers ) )
				: esc_html__( 'Couldn\'t send message. Check your settings!', 'mailster' ) . '<br><strong>' . $mail->get_errors() . '</strong>';
		}

		if ( isset( $return['log'] ) ) {
			$return['msg'] .= '<br>' . esc_html__( 'Check your console for more info.', 'mailster' );
		}

		if ( ! $success ) {
			wp_send_json_error( $return );
		}

		wp_send_json_success( $return );
	}



	private function health_check() {

		$this->ajax_nonce(
			json_encode(
				array(
					'success' => false,
					'msg'     => esc_html__( 'Nonce invalid! Please reload site.', 'mailster' ),
				)
			)
		);

		$return = array();

		$success = mailster( 'health' )->send_test();

		$return['msg'] = ! is_wp_error( $success )
			? esc_html__( 'Message sent. Check your inbox!', 'mailster' )
			: esc_html__( 'Couldn\'t send message. Check your settings!', 'mailster' ) . '<br><strong>' . $success->get_error_message() . '</strong>';

		if ( is_wp_error( $success ) ) {
			wp_send_json_error( $return );
		}

		$return['id'] = $success;

		wp_send_json_success( $return );
	}


	private function get_list_counts() {

		$this->ajax_nonce();

		$return = array();

		$id        = isset( $_POST['id'] ) ? (array) $_POST['id'] : null;
		$status    = isset( $_POST['status'] ) ? (array) $_POST['status'] : null;
		$formatted = isset( $_POST['formatted'] ) ? ( $_POST['formatted'] == 'true' ) : false;

		$counts = mailster( 'lists' )->get( $id, $status, true );

		$counts = wp_list_pluck( $counts, 'subscribers', 'ID' );
		if ( $formatted ) {
			$return['counts'] = array_map( 'number_format_i18n', $counts );
		} else {
			$return['counts'] = array_map( 'absint', $counts );
		}

		wp_send_json_success( $return );
	}


	private function get_totals() {

		$this->ajax_nonce();

		$campaign_ID = (int) $_POST['id'];
		$lists       = ( $_POST['ignore_lists'] == 'true' ) ? false : ( isset( $_POST['lists'] ) ? $_POST['lists'] : array() );
		$conditions  = isset( $_POST['conditions'] ) ? stripslashes_deep( array_values( array_filter( $_POST['conditions'] ) ) ) : false;
		$statuses    = null;

		$return['total']          = mailster( 'campaigns' )->get_totals_by_lists( $lists, $conditions, $statuses, $campaign_ID );
		$return['conditions']     = mailster( 'conditions' )->render( $conditions, false );
		$return['totalformatted'] = number_format_i18n( $return['total'] );

		wp_send_json_success( $return );
	}


	private function get_totals_list() {

		global $wpdb;

		$this->ajax_nonce();

		$campaign_ID = (int) $_POST['id'];
		$lists       = ( $_POST['ignore_lists'] == 'true' ) ? false : ( isset( $_POST['lists'] ) ? $_POST['lists'] : array() );
		$conditions  = isset( $_POST['conditions'] ) ? stripslashes_deep( array_values( array_filter( $_POST['conditions'] ) ) ) : false;
		$statuses    = null;

		$query_args = array(
			'lists'      => $lists,
			'conditions' => $conditions,
			'statuses'   => null,
		);

		$return['html']  = '<table class="wp-list-table widefat"><tbody>';
		$return['html'] .= mailster( 'campaigns' )->get_totals_part( $campaign_ID, $query_args );
		$return['html'] .= '</tbody>';
		$return['html'] .= '</table>';

		$return['total']          = (int) $wpdb->get_var( 'SELECT FOUND_ROWS();' );
		$return['totalformatted'] = number_format_i18n( $return['total'] );

		wp_send_json_success( $return );
	}


	private function get_totals_list_part() {

		global $wpdb;

		$this->ajax_nonce();

		$campaign_ID = (int) $_POST['id'];
		$page        = (int) $_POST['page'];
		$lists       = ( $_POST['ignore_lists'] == 'true' ) ? false : ( isset( $_POST['lists'] ) ? $_POST['lists'] : array() );
		$conditions  = isset( $_POST['conditions'] ) ? stripslashes_deep( array_values( array_filter( $_POST['conditions'] ) ) ) : false;
		$statuses    = null;

		$query_args = array(
			'lists'      => $lists,
			'conditions' => $conditions,
			'statuses'   => null,
			'page'       => $page,
		);

		$return['html'] = mailster( 'campaigns' )->get_totals_part( $campaign_ID, $query_args );

		wp_send_json_success( $return );
	}


	private function save_color_schema() {

		$this->ajax_nonce();

		$colors     = get_option( 'mailster_colors', array() );
		$hash       = md5( implode( '', $_POST['colors'] ) );
		$template   = esc_attr( $_POST['template'] );
		$new_colors = (array) $_POST['colors'];

		if ( ! isset( $colors[ $template ] ) ) {
			$colors[ $template ] = array();
		}

		$colors[ $template ][ $hash ] = $new_colors;

		$return['html']  = '<div class="colorschema">';
		$return['html'] .= '<span class="colorschema-title">' . esc_html__( 'Custom', 'mailster' ) . '</span>';
		foreach ( $new_colors as $id => $color ) {
			$return['html'] .= '<span class="colorschema-field" data-id="' . esc_attr( $id ) . '" data-hex="' . esc_attr( $color ) . '" style="background-color:' . esc_attr( $color ) . '"></span>';
		}
		$return['html'] .= '<a class="colorschema-delete" data-hash="' . esc_attr( $hash ) . '">&#10005;</a>';
		$return['html'] .= '</div>';

		if ( ! update_option( 'mailster_colors', $colors ) ) {
			wp_send_json_error( $return );
		}

		wp_send_json_success( $return );
	}


	private function delete_color_schema() {

		$this->ajax_nonce();

		$colors = get_option( 'mailster_colors' );

		$template = esc_attr( $_POST['template'] );

		if ( ! isset( $colors[ $template ] ) ) {
			$colors[ $template ] = array();
		}

		if ( isset( $colors[ $template ][ $_POST['hash'] ] ) ) {
			unset( $colors[ $template ][ $_POST['hash'] ] );
		}

		if ( empty( $colors[ $template ] ) ) {
			unset( $colors[ $template ] );
		}

		if ( ! update_option( 'mailster_colors', $colors ) ) {
			wp_send_json_error();
		}
		wp_send_json_success();
	}


	private function delete_color_schema_all() {

		$this->ajax_nonce();

		$colors = get_option( 'mailster_colors' );

		$template = esc_attr( $_POST['template'] );

		if ( isset( $colors[ $template ] ) ) {
			unset( $colors[ $template ] );
		}

		if ( ! update_option( 'mailster_colors', $colors ) ) {
			wp_send_json_error();
		}

		wp_send_json_success();
	}


	private function get_clicks() {

		$this->ajax_nonce();

		$campaign_ID = (int) $_POST['id'];

		$clicked_links = mailster( 'campaigns' )->get_clicked_links( $campaign_ID );
		$clicks_total  = mailster( 'campaigns' )->get_clicks( $campaign_ID, true );

		$return['html'] = '<table class="wp-list-table widefat"><tbody>';

		$i = 1;
		foreach ( $clicked_links as $link => $indexes ) {
			foreach ( $indexes as $index => $counts ) {
				$return['html'] .= '<tr ' . ( ! ( $i % 2 ) ? ' class="alternate"' : '' ) . '><td>' . sprintf( esc_html__( _n( '%s click', '%s clicks', $counts['total'], 'mailster' ) ), $counts['total'] ) . ' ' . ( $counts['total'] != $counts['clicks'] ? '<span class="count">(' . sprintf( esc_html__( '%s unique', 'mailster' ), $counts['clicks'] ) . ')</span>' : '' ) . '</td><td>' . round( ( $counts['total'] / $clicks_total * 100 ), 2 ) . '%</td><td><a href="' . $link . '" class="external clicked-link">' . $link . '</a></td></tr>';
				++$i;
			}
		}

		$return['html'] .= '</tbody>';
		$return['html'] .= '</table>';

		wp_send_json_success( $return );
	}


	private function get_errors() {

		$this->ajax_nonce();

		$timeformat = mailster( 'helper' )->timeformat();
		$timeoffset = mailster( 'helper' )->gmt_offset( true );

		$campaign_ID = (int) $_POST['id'];

		$errors = mailster( 'campaigns' )->get_error_list( $campaign_ID );

		$return['html'] = '<table class="wp-list-table widefat"><tbody>';

		foreach ( $errors as $i => $data ) {
			$return['html'] .= '<tr ' . ( ! ( $i % 2 ) ? ' class="alternate"' : '' ) . '><td class="textright">' . ( $i + 1 ) . '</td><td><a href="edit.php?post_type=newsletter&page=mailster_subscribers&ID=' . $data->ID . '">' . $data->email . '</a></td><td><span class="red">' . $data->errormsg . '</span></td><td>' . date_i18n( $timeformat, $data->timestamp + $timeoffset ) . '</td></tr>';
		}

		$return['html'] .= '</tbody>';
		$return['html'] .= '</table>';

		wp_send_json_success( $return );
	}


	private function get_environment() {

		$this->ajax_nonce();

		$campaign_ID = (int) $_POST['id'];

		$clients = mailster( 'campaigns' )->get_clients( $campaign_ID );

		$return['html'] = '<table class="wp-list-table widefat"><tbody>';

		$i = 1;
		foreach ( $clients as $client ) {
			$return['html'] .= '<tr ' . ( ! ( $i % 2 ) ? ' class="alternate"' : '' ) . '><td class="client-type"><span class="mailster-icon client-' . $client['type'] . '"></span></td><td>' . $client['name'] . ' ' . $client['version'] . '</td><td>' . round( $client['percentage'] * 100, 2 ) . ' % <span class="count">(' . $client['count'] . ' ' . esc_html__( _n( 'opened', 'opens', $client['count'], 'mailster' ) ) . ')</span></td></tr>';
			++$i;
		}

		$return['html'] .= '</tbody>';
		$return['html'] .= '</table>';

		wp_send_json_success( $return );
	}


	private function get_geolocation() {

		$this->ajax_nonce();

		$campaign_ID = (int) $_POST['id'];

		$geo_data   = mailster( 'campaigns' )->get_geo_data( $campaign_ID );
		$totalopens = mailster( 'campaigns' )->get_opens( $campaign_ID );

		$unknown_cities = array();
		$countrycodes   = array();

		foreach ( $geo_data as $countrycode => $data ) {
			$x = wp_list_pluck( $data, 3 );
			if ( $x ) {
				$countrycodes[ $countrycode ] = array_sum( $x );
			}

			if ( $data[0][3] ) {
				$unknown_cities[ $countrycode ] = $data[0][3];
			}
		}

		arsort( $countrycodes );
		$total = array_sum( $countrycodes );

		$return['geodata']        = $geo_data;
		$return['unknown_cities'] = $unknown_cities;
		$return['countrydata']    = array( array( 'code', esc_html__( 'Country', 'mailster' ), esc_html__( 'opens', 'mailster' ) ) );

		foreach ( $geo_data as $country => $cities ) {
			$opens = 0;
			foreach ( $cities as $city ) {
				$opens += $city[3];
			}
			$return['countrydata'][] = array( $country, mailster( 'geo' )->code2Country( $country ), $opens );
		}

		$return['html'] = '<div id="countries_wrap"><a class="zoomout button mailster-icon" title="' . esc_html__( 'back to world view', 'mailster' ) . '">&nbsp;</a><div id="countries_map"></div><div id="mapinfo"></div><div id="countries_table"><table class="wp-list-table widefat">
			<tbody>';

		$i       = 0;
		$unknown = $totalopens - $total;

		foreach ( $countrycodes as $countrycode => $count ) {
			$data            = $geo_data[ $countrycode ];
			$return['html'] .= '<tr data-code="' . $countrycode . '" id="country-row-' . $countrycode . '" class="' . ( ( ! ( $i % 2 ) ) ? ' alternate' : '' ) . '"><td width="20"><span class="mailster-flag-24 flag-' . strtolower( $countrycode ) . '"></span></td><td width="100%"><span class="country">' . mailster( 'geo' )->code2Country( $countrycode ) . '</span> <span class="count">(' . round( $count / $totalopens * 100, 2 ) . '%)</span></td><td class="textright">' . number_format_i18n( $count ) . '</td></tr>';
			++$i;
		}

		if ( $unknown ) :
			$return['html'] .= '<tr data-code="-" id="country-row-unknown" class="' . ( ( ! ( $i % 2 ) ) ? ' alternate' : '' ) . '"><td width="20"><span class="mailster-flag-24 flag-unknown"></span></td><td width="100%">' . esc_html__( 'unknown', 'mailster' ) . ' <span class="count">(' . round( $unknown / $totalopens * 100, 2 ) . '%)</span></td><td class="textright">' . number_format_i18n( $unknown ) . '</td></tr>';
		endif;

		$return['html'] .= '</tbody></table></div>';

		wp_send_json_success( $return );
	}


	private function get_recipients() {

		$this->ajax_nonce();

		$campaign_id = (int) $_POST['id'];

		$parts   = ! empty( $_POST['types'] ) ? explode( ',', $_POST['types'] ) : array( 'unopen', 'opens', 'clicks', 'unsubs', 'bounces' );
		$orderby = ! empty( $_POST['orderby'] ) ? $_POST['orderby'] : 'sent';
		$order   = ! isset( $_POST['order'] ) || $_POST['order'] == 'DESC' ? 'DESC' : 'ASC';

		$return['html'] = '<table class="wp-list-table widefat"><tbody>';

		$return['html'] = mailster( 'campaigns' )->get_recipients_part( $campaign_id, $parts, 0, $orderby, $order );

		$return['html'] .= '</tbody>';
		$return['html'] .= '</table>';

		wp_send_json_success( $return );
	}


	private function get_recipients_page() {

		$this->ajax_nonce();

		$campaign_id = (int) $_POST['id'];
		$page        = (int) $_POST['page'];

		$parts   = ! empty( $_POST['types'] ) ? explode( ',', $_POST['types'] ) : array( 'unopen', 'opens', 'clicks', 'unsubs', 'bounces' );
		$orderby = ! empty( $_POST['orderby'] ) ? $_POST['orderby'] : 'sent';
		$order   = ! isset( $_POST['order'] ) || $_POST['order'] == 'ASC' ? 'ASC' : 'DESC';

		$return['html'] = mailster( 'campaigns' )->get_recipients_part( $campaign_id, $parts, $page, $orderby, $order );

		wp_send_json_success( $return );
	}


	private function get_recipient_detail() {

		$this->ajax_nonce();

		$subscriber_id  = (int) $_POST['id'];
		$campaign_id    = (int) $_POST['campaignid'];
		$campaign_index = (int) $_POST['index'];

		$return['html'] = mailster( 'subscribers' )->get_recipient_detail( $subscriber_id, $campaign_id, $campaign_index );

		wp_send_json_success( $return );
	}


	private function create_image() {

		$this->ajax_nonce();

		if ( ! isset( $_POST['id'] ) ) {
			wp_send_json_error();
		}

		$id       = basename( $_POST['id'] );
		$src      = isset( $_POST['src'] ) ? ( $_POST['src'] ) : null;
		$crop     = isset( $_POST['crop'] ) ? ( $_POST['crop'] == 'true' ) : false;
		$width    = isset( $_POST['width'] ) ? (int) $_POST['width'] : null;
		$height   = isset( $_POST['height'] ) && $crop ? (int) $_POST['height'] : null;
		$original = isset( $_POST['original'] ) ? ( $_POST['original'] == 'true' ) : false;

		if ( ! ( $return['image'] = mailster( 'helper' )->create_image( $id, $src, $width, $height, $crop, $original ) ) ) {
			wp_send_json_error();
		}

		wp_send_json_success( $return );
	}


	private function image_placeholder() {

		$factor = ! empty( $_GET['f'] ) ? (int) $_GET['f'] : 1;
		$width  = $factor * ( ! empty( $_GET['w'] ) ? (int) $_GET['w'] : 600 );
		$height = $factor * ( ! empty( $_GET['h'] ) ? (int) $_GET['h'] : round( $width / 1.6 ) );
		$tag    = isset( $_GET['tag'] ) ? '' . esc_attr( $_GET['tag'] ) . '' : '';

		$text = '{' . strtoupper( $tag ) . '}';

		$im = imagecreatetruecolor( $width, $height );

		$bg           = imagecolorallocate( $im, 248, 248, 248 );
		$font_color   = imagecolorallocate( $im, 210, 213, 218 );
		$border_color = imagecolorallocate( $im, 237, 237, 237 );

		$bordersize     = 4;
		$halfbordersize = round( $bordersize / 2 );

		imagefilledrectangle( $im, 0, 0, $width, $height, $bg );

		imagesetthickness( $im, $bordersize );
		imagerectangle( $im, 0, 0, $width, $height, $border_color );

		imagesetthickness( $im, $halfbordersize );
		imageline( $im, 0, 0, $width, $height, $border_color );
		imageline( $im, 0, $height, $width, 0, $border_color );

		if ( function_exists( 'imagettftext' ) ) {

			$font_size = max( 8, round( $width / strlen( $text ) * 1.3 ) );
			$font      = MAILSTER_DIR . 'assets/font/Jost-Regular.ttf';
			$bbox      = imagettfbbox( $font_size, 0, $font, $text );

			$center_x = absint( $width / 2 - ( abs( $bbox[4] - $bbox[6] ) / 2 ) );
			$center_y = absint( $height / 2 + ( abs( $bbox[3] - $bbox[5] ) / 3 ) );

			imagettftext( $im, $font_size, 0, $center_x, $center_y, $font_color, $font, $text );

		} else {

			$font_size = 5;

			$fw = imagefontwidth( $font_size );
			$fh = imagefontheight( $font_size );
			$l  = strlen( $text );
			$tw = $l * $fw;

			$center_x = ( $width - $tw ) / 2;
			$center_y = ( $height - $font_size ) / 2;

			imagestring( $im, $font_size, $center_x, $center_y, $text, $font_color );

		}

		header( 'Expires: Thu, 31 Dec 2050 23:59:59 GMT' );
		header( 'Cache-Control: max-age=3600' );
		header( 'Pragma: cache' );
		header( 'Content-Type: image/gif' );

		imagegif( $im );

		imagedestroy( $im );
	}


	private function get_post_list() {

		global $wp_post_statuses;
		$this->ajax_nonce();

		$offset    = (int) $_POST['offset'];
		$search    = esc_attr( $_POST['search'] );
		$post_type = esc_attr( $_POST['type'] );

		$post_count = mailster_option( 'post_count', 30 );

		if ( in_array( $post_type, array( 'post', 'attachment' ) ) ) {

			$imagetype   = esc_attr( $_POST['imagetype'] );
			$current_id  = isset( $_POST['id'] ) ? (int) $_POST['id'] : null;
			$post_counts = 0;
			$is_unsplash = 'attachment' == $post_type && 'unsplash' == $imagetype;

			$defaults = array(
				'post_type'              => $post_type,
				'posts_per_page'         => $post_count,
				'suppress_filters'       => true,
				'update_post_term_cache' => false,
				'update_post_meta_cache' => false,
				'offset'                 => $offset,
				'orderby'                => 'post_date',
				'order'                  => 'DESC',
				'exclude'                => $current_id,
				's'                      => $search ? $search : null,
			);

			if ( 'post' == $post_type ) {
				parse_str( $_POST['posttypes'], $pt );

				if ( isset( $pt['post_types'] ) ) {
					$post_types = (array) $pt['post_types'];
				} else {
					$post_types = array( -1 );
				}

				$args = wp_parse_args(
					array(
						'post_type'   => $post_types,
						'post_status' => array( 'publish', 'future', 'draft', 'private' ),
					),
					$defaults
				);

			} elseif ( $is_unsplash ) {

			} elseif ( 'attachment' == $post_type ) {
				$args = wp_parse_args(
					array(
						'post_status'    => 'inherit',
						'post_mime_type' => array( 'image/jpeg', 'image/gif', 'image/png', 'image/tiff', 'image/bmp' ),
					),
					$defaults
				);

			}

			$return['itemcount'] = isset( $_POST['itemcount'] ) ? $_POST['itemcount'] : array();

			if ( $is_unsplash ) {

				$response = mailster( 'helper' )->unsplash(
					'search',
					array(
						'offset' => $offset,
						'query'  => $search,
					)
				);

				if ( is_wp_error( $response ) ) {
					$post_counts = $response;
				} elseif ( isset( $response->total ) ) {
						$post_counts = $response->total;
						$posts       = $response->results;
				} else {
					$post_counts = -1;
					$posts       = $response;
				}
			} else {

				$args        = apply_filters( 'mailster_get_post_list_args', $args );
				$query       = new WP_Query( $args );
				$posts       = $query->posts;
				$post_counts = $query->found_posts;

				if ( $current_id && ( $current = get_post( $current_id ) ) ) {

					array_unshift( $posts, $current );
					++$post_counts;

				} else {
					$args['exclude'] = null;
				}
			}

			if ( is_wp_error( $post_counts ) ) {
				$return['html'] = '<li class="norows error"><span>' . $post_counts->get_error_message() . '</span></li>';
			} elseif ( $post_counts ) {

				if ( $post_counts == -1 ) {
					$posts_lefts = -1;
				} else {
					$posts_lefts = max( 0, $post_counts - $offset - $post_count );
				}

				$html = '';

				if ( 'post' == $post_type ) {

					$pts = mailster( 'helper' )->get_post_types( true, 'objects' );

					foreach ( $posts as $post ) {
						if ( ! isset( $return['itemcount'][ $post->post_type ] ) ) {
							$return['itemcount'][ $post->post_type ] = 0;
						}

						$relative = ( --$return['itemcount'][ $post->post_type ] );
						$hasthumb = (bool) ( $thumbid = get_post_thumbnail_id( $post->ID ) );
						$html    .= '<li data-id="' . $post->ID . '" data-name="' . esc_attr( $post->post_title ) . '" class="status-' . $post->post_status . '';
						if ( $current_id == $post->ID ) {
							$html .= ' selected';
						}

						( $hasthumb )
							? $html .= ' has-thumb" data-thumbid="' . $thumbid . '"'
							: $html .= '"';
						$html       .= ' data-link="' . get_permalink( $post->ID ) . '" data-type="' . $post->post_type . '" data-relative="' . $relative . '">';
						( $hasthumb )
							? $html .= get_the_post_thumbnail( $post->ID, array( 48, 48 ) )
							: $html .= '<div class="no-feature"></div>';
						$html       .= '<span class="post-type">' . $pts[ $post->post_type ]->labels->singular_name . '</span>';
						$html       .= '<strong>' . $post->post_title . '' . ( $post->post_status != 'publish' ? ' <em class="post-status wp-ui-highlight">' . $wp_post_statuses[ $post->post_status ]->label . '</em>' : '' ) . '</strong>';
						$html       .= '<span class="excerpt">' . trim( wp_trim_words( preg_replace( '~(?:\[/?)[^/\]]+/?\]~s', '', $post->post_content ), 25 ) ) . '</span>';
						$html       .= '<span class="date">' . date_i18n( mailster( 'helper' )->dateformat(), strtotime( $post->post_date ) ) . '</span>';
						$html       .= '</li>';
					}
				} elseif ( 'attachment' == $post_type ) {

					foreach ( $posts as $post ) {

						if ( 'unsplash' == $imagetype ) {
							$post_id       = $post->id;
							$unsplash_args = apply_filters( 'mailster_create_image_unsplash_args', array(), $post_id, $post->urls->raw, $post->width, $post->height, null );
							$src           = add_query_arg( $unsplash_args, $post->urls->small );
							$asp           = $post->width / $post->height;
							$thumb_src     = add_query_arg( $unsplash_args, $post->urls->thumb );
							$title         = isset( $post->alt_description ) ? $post->alt_description : $post->id;
							$title        .= ' ' . sprintf( esc_html__( 'by %s', 'mailster' ), $post->user->name . ' (@' . $post->user->username . ')' );
							$class         = 'is-unsplash';
						} else {
							$post_id   = $post->ID;
							$image     = wp_get_attachment_image_src( $post_id, 'full' );
							$src       = $image[0];
							$asp       = $image[2] ? str_replace( ',', '.', $image[1] / $image[2] ) : '';
							$thumbnail = wp_get_attachment_image_src( $post_id, 'medium' );
							$thumb_src = $thumbnail[0];
							$title     = $post->post_title ? $post->post_title : ( $post->post_excerpt ? $post->post_excerpt : basename( $image[0] ) );
							$class     = '';
						}
						if ( $current_id && $current_id == $post_id ) {
							$class .= ' selected';
						}

						$html .= '<li data-id="' . $post_id . '" data-name="' . esc_attr( $title ) . '" data-src="' . esc_attr( $src ) . '" data-asp="' . ( $asp ) . '" class="' . esc_attr( $class ) . '"';
						$html .= '>';
						$html .= '<a style="background-image:url(' . $thumb_src . ')"><span class="caption" title="' . esc_attr( $title ) . '">' . esc_html( $title ) . '</span></a>';
						$html .= '</li>';
					}
				}

				if ( $posts_lefts ) {
					$html .= '<li class="load-more-posts" data-offset="' . ( $offset + $post_count ) . '" data-type="' . $post_type . '"><a><span>';
					if ( $posts_lefts == -1 ) {
						$html .= esc_html__( 'Load more entries', 'mailster' );
					} else {
						$html .= sprintf( esc_html__( 'Load more entries (%s left)', 'mailster' ), number_format_i18n( $posts_lefts ) );
					}
					$html .= '</span></a></li>';
				}

				$return['html'] = $html;
			} else {
				$return['html'] = '<li class="norows"><span>' . esc_html__( 'No entries found!', 'mailster' ) . '</span></li>';
			}
		} elseif ( 'link' == $post_type ) {

			$args = array();

			$post_counts = mailster( 'helper' )->link_query(
				array(
					'post_status' => array( 'publish', 'finished', 'queued', 'paused' ),
				),
				true
			);

			$posts_lefts = max( 0, $post_counts - $offset - $post_count );

			$results = mailster( 'helper' )->link_query(
				array(
					'offset'         => $offset,
					'posts_per_page' => $post_count,
					'post_status'    => array( 'publish', 'finished', 'queued', 'paused' ),
				)
			);

			if ( isset( $results ) ) {
				$html = '';
				foreach ( $results as $entry ) {
					$hasthumb = (bool) ( $thumbid = get_post_thumbnail_id( $entry['ID'] ) );
					$html    .= '<li data-id="' . $entry['ID'] . '" data-name="' . $entry['title'] . '"';
					if ( $hasthumb ) {
						$html .= ' data-thumbid="' . $thumbid . '" class="has-thumb"';
					}

					$html       .= ' data-link="' . $entry['permalink'] . '">';
					( $hasthumb )
						? $html .= get_the_post_thumbnail( $entry['ID'], array( 48, 48 ) )
						: $html .= '<div class="no-feature"></div>';
					$html       .= '<strong>' . $entry['title'] . '</strong>';
					$html       .= '<span class="link">' . $entry['permalink'] . '</span>';
					$html       .= '<span class="info">' . $entry['info'] . '</span>';
					$html       .= '</li>';
				}
				if ( $posts_lefts ) {
					$html .= '<li class="load-more-posts" data-offset="' . ( $offset + $post_count ) . '" data-type="' . $post_type . '"><a><span>';
					if ( $posts_lefts == -1 ) {
						$html .= esc_html__( 'Load more entries', 'mailster' );
					} else {
						$html .= sprintf( esc_html__( 'Load more entries (%s left)', 'mailster' ), number_format_i18n( $posts_lefts ) );
					}
					$html .= '</span></a></li>';
				}

				$return['html'] = $html;

			} else {
				$return['html'] = '<li class="norows"><span>' . esc_html__( 'No entries found!', 'mailster' ) . '</span></li>';
			}
		}

		wp_send_json_success( $return );
	}


	private function get_post() {

		$this->ajax_nonce();

		if ( is_numeric( $_POST['id'] ) ) {
			$post    = get_post( (int) $_POST['id'] );
			$expects = isset( $_POST['expect'] ) ? (array) $_POST['expect'] : array();

			if ( $post ) {

				$length = apply_filters( 'mailster_excerpt_length', null );
				if ( empty( $post->post_excerpt ) && preg_match( '/<!--more(.*?)?-->/', $post->post_content, $matches ) ) {
					$content            = explode( $matches[0], $post->post_content, 2 );
					$post->post_excerpt = trim( $content[0] );
					$post->post_excerpt = mailster_remove_block_comments( $post->post_excerpt );
				}

				if ( empty( $post->post_excerpt ) ) {
					$post->post_excerpt = mailster( 'helper' )->get_excerpt( $post->post_content, $length );
				} elseif ( $length ) {
					$post->post_excerpt = wp_trim_words( $post->post_excerpt, $length );
				}

				$post->post_excerpt = apply_filters( 'the_excerpt', $post->post_excerpt );
				$link               = get_permalink( $post->ID );

				$content = wpautop( mailster_remove_block_comments( $post->post_content ) );

				if ( ! empty( $post->post_excerpt ) ) {
					$excerpt = wpautop( mailster_remove_block_comments( $post->post_excerpt ) );
				} else {
					$excerpt = mailster( 'helper' )->get_excerpt( $content );
				}

				$image = null;
				if ( $post_thumbnail_id = get_post_thumbnail_id( $post->ID ) ) {
					$image = array(
						'id'   => $post_thumbnail_id,
						'name' => $post->post_title,
					);
				}

				$content = str_replace( '<img ', '<img editable ', $content );

				$content = mailster( 'helper' )->handle_shortcodes( $content );
				$excerpt = mailster( 'helper' )->handle_shortcodes( $excerpt );

				$data = array(
					'title'   => $post->post_title,
					'alt'     => $post->post_title,
					'content' => $content,
					'excerpt' => $excerpt,
					'link'    => get_permalink( $post->ID ),
					'image'   => $image,
					'button'  => esc_html__( 'Read More', 'mailster' ),
				);

				foreach ( $expects as $expect ) {
					if ( isset( $data[ $expect ] ) ) {
						continue;
					}
					$data[ $expect ] = mailster( 'placeholder' )->get_replace( $post, $expect );
				}

				$return['pattern'] = apply_filters( 'mailster_auto_post', $data, $post );

			}
		}

		wp_send_json_success( $return );
	}


	private function check_for_posts() {

		$this->ajax_nonce();

		$campaign_id            = (int) $_POST['id'];
		$post_type              = sanitize_key( $_POST['post_type'] );
		$relative_or_identifier = stripslashes( $_POST['relative'] );
		$term_ids               = isset( $_POST['extra'] ) ? (array) $_POST['extra'] : array();
		$modulename             = isset( $_POST['modulename'] ) ? $_POST['modulename'] : null;
		$rss_url                = isset( $_POST['rss_url'] ) ? $_POST['rss_url'] : null;
		$expects                = isset( $_POST['expect'] ) ? (array) $_POST['expect'] : array();
		$args                   = array();
		$static_post_types      = mailster( 'helper' )->get_post_types();
		$is_dynmaic_post_type   = ! isset( $static_post_types[ $post_type ] );

		// special case for RSS.
		if ( 'rss' == $post_type ) {
			$args['mailster_rss_url'] = $rss_url;
		}

		if ( 0 === strpos( $relative_or_identifier, '~' ) ) {
			$post = mailster()->get_random_post( substr( $relative_or_identifier, 1 ), $post_type, $term_ids, $args, $campaign_id );
		} else {
			$post = mailster()->get_last_post( $relative_or_identifier + 1, $post_type, $term_ids, $args, $campaign_id );
		}

		if ( is_wp_error( $post ) ) {
			$return['title'] = $post->get_error_message();
		} elseif ( is_a( $post, 'WP_Post' ) ) {
			if ( $rss_url ) {
				$return['title'] = '<a href="' . $post->post_permalink . '" class="external">#' . absint( $relative_or_identifier ) . ' &ndash; ' . ( $post->post_title ? $post->post_title : esc_html__( 'No title', 'mailster' ) ) . '</a>';
			} elseif ( $is_dynmaic_post_type ) {
					$return['title'] = $post->post_title ? $post->post_title : esc_html__( 'No Title', 'mailster' );
			} else {

				$return['title'] = '<a href="' . admin_url( 'post.php?post=' . $post->ID . '&action=edit' ) . '" class="external">#' . $post->ID . ' &ndash; ' . ( $post->post_title ? $post->post_title : esc_html__( 'No Title', 'mailster' ) ) . '</a>';

			}
		} else {
			$return['title'] = esc_html__( 'There\'s currently no match for your selection!', 'mailster' );
			if ( ! $rss_url ) {
				if ( ! $is_dynmaic_post_type ) {
					$return['title'] .= ' <a href="post-new.php?post_type=' . $post_type . '" class="external">' . esc_html__( 'Create a new one', 'mailster' ) . '</a>?';
				}
			}
		}

		$options = $relative_or_identifier . ( ! empty( $term_ids ) ? ';' . implode( ';', $term_ids ) : '' );

		$pattern = array(
			'title'   => '{' . $post_type . '_title:' . $options . '}',
			'alt'     => '{' . $post_type . '_title:' . $options . '}',
			'content' => '{' . $post_type . '_content:' . $options . '}',
			'excerpt' => '{' . $post_type . '_excerpt:' . $options . '}',
			'link'    => '{' . $post_type . '_link:' . $options . '}',
			'button'  => '{' . $post_type . '_button:' . $options . '}',
			'image'   => '{' . $post_type . '_image:' . $options . '}',
		);

		foreach ( $expects as $expect ) {
			if ( isset( $pattern[ $expect ] ) ) {
				continue;
			}
			$pattern[ $expect ] = '{' . $post_type . '_' . $expect . ':' . $options . '}';
		}

		$return['pattern'] = apply_filters( 'mailster_auto_tag', $pattern, $post_type, $options, $post, $modulename );

		$return['pattern']['tag'] = '{' . $post_type . ':' . $options . '}';

		wp_send_json_success( $return );
	}


	private function get_post_term_dropdown() {

		$this->ajax_nonce();

		$post_type   = $_POST['posttype'];
		$labels      = isset( $_POST['labels'] ) ? ( $_POST['labels'] == 'true' ) : false;
		$names       = isset( $_POST['names'] ) ? $_POST['names'] : false;
		$campaign_id = isset( $_POST['id'] ) ? (int) $_POST['id'] : false;
		$values      = null;

		if ( $campaign_id ) {
			$data   = mailster( 'campaigns' )->meta( $campaign_id, 'autoresponder' );
			$values = isset( $data['terms'] ) ? (array) $data['terms'] : null;
		}

		$return['html'] = '<div class="dynamic_embed_options_taxonomies">' . mailster( 'helper' )->get_post_term_dropdown( $post_type, $labels, $names, $values ) . '</div>';

		wp_send_json_success( $return );
	}


	private function forward_message() {

		parse_str( $_POST['data'], $data );

		if ( ! wp_verify_nonce( $data['_wpnonce'], $data['url'] ) ) {
			die();
		}

		if ( empty( $data['message'] ) || ! mailster_is_email( $data['receiver'] ) || ! mailster_is_email( $data['sender'] ) || empty( $data['sendername'] ) ) {

			$return['msg'] = esc_html__( 'Please fill out all fields correctly!', 'mailster' );

			wp_send_json_success( $return );

		}

		$mail            = mailster( 'mail' );
		$mail->to        = esc_attr( $data['receiver'] );
		$mail->subject   = esc_attr( '[' . get_bloginfo( 'name' ) . '] ' . sprintf( esc_html__( '%s is forwarding an email to you!', 'mailster' ), $data['sendername'] ) );
		$mail->from      = mailster_option( 'from' );
		$mail->from_name = sprintf( esc_html_x( '%1$s via %2$s', 'user forwarded via website', 'mailster' ), $data['sendername'], get_bloginfo( 'name' ) );

		$message = nl2br( $data['message'] ) . '<br><br>' . $data['url'];

		$replace = array(
			'notification' => sprintf( esc_html__( '%1$s is forwarding this mail to you via %2$s', 'mailster' ), $data['sendername'] . ' (<a href="mailto:' . esc_attr( $data['sender'] ) . '">' . esc_attr( $data['sender'] ) . '</a>)', '<a href="' . get_bloginfo( 'url' ) . '">' . get_bloginfo( 'name' ) . '</a>' ),
		);

		if ( ! $mail->send_notification( $message, $mail->subject, $replace ) ) {
			$return['msg'] = esc_html__( 'Sorry, we couldn\'t deliver your message. Please try again later!', 'mailster' );
			wp_send_json_error( $return );
		}

		$return['msg'] = esc_html__( 'Your message was sent successfully!', 'mailster' );
		wp_send_json_success( $return );
	}


	private function set_template_html() {

		$this->ajax_nonce();

		$this->ajax_filesystem();

		$slug           = sanitize_file_name( basename( wp_unslash( $_POST['slug'] ) ) );
		$file_raw       = basename( wp_unslash( $_POST['file'] ) );
		$file_sanitized = sanitize_file_name( $file_raw );
		$new            = ! empty( $_POST['name'] );

		if ( empty( $slug ) || empty( $file_raw ) ) {
			$return['msg'] = esc_html__( 'Not able to save file!', 'mailster' );
			wp_send_json_error( $return );
		}

		if ( ! $new ) {
			if ( ! $this->is_allowed_template_html_file( $file_raw ) ) {
				$return['msg'] = esc_html__( 'Only HTML template files can be saved.', 'mailster' );
				wp_send_json_error( $return );
			}

			$template_files = array_keys( mailster( 'templates' )->get_files( $slug ) );

			if ( in_array( $file_raw, $template_files, true ) ) {
				$file = $file_raw;
			} elseif ( $file_raw === $file_sanitized ) {
				$file = $file_raw;
			} else {
				$return['msg'] = esc_html__( 'Not able to save file!', 'mailster' );
				wp_send_json_error( $return );
			}
		} else {
			$file = $file_sanitized;

			if ( empty( $file ) ) {
				$return['msg'] = esc_html__( 'Not able to save file!', 'mailster' );
				wp_send_json_error( $return );
			}
		}

		$return['slug'] = esc_attr( $slug );
		$return['file'] = esc_attr( $file );

		$name     = $new ? esc_attr( $_POST['name'] ) : $return['file'];
		$content  = stripslashes( $_POST['content'] );
		$filename = false;

		if ( $new ) {
			$data = mailster( 'templates' )->get_template_data( $content );

			$content = preg_replace( '#^(\s)?<!--(.*)-->\n(\s)?#sUm', '', $content );

			$filename = mailster( 'template', $slug )->create_new( $name, $content );

		} else {

			$file_path = $this->get_template_file_path( $slug, $file );

			if ( is_wp_error( $file_path ) ) {
				$return['msg'] = $file_path->get_error_message();
				wp_send_json_error( $return );
			}

			$wp_filesystem = mailster_require_filesystem();
			$content       = mailster()->sanitize_content( $content, null, true );

			if ( $wp_filesystem->put_contents( $file_path, $content, FS_CHMOD_FILE ) ) {
				$filename = $file_path;
			}
		}

		if ( ! $filename ) {
			$return['msg'] = esc_html__( 'Not able to save file!', 'mailster' );
			wp_send_json_error( $return );
		}
			$file = basename( $filename );
		if ( $new ) {
			$return['newfile'] = $file;
		}

			$return['msg'] = esc_html__( 'File has been saved!', 'mailster' );

		wp_send_json_success( $return );
	}


	private function delete_template() {

		$this->ajax_nonce();

		$slug = basename( $_POST['slug'] );
		$file = basename( $_POST['file'] );

		if ( ! mailster( 'templates' )->remove_template( $slug, $file ) ) {
			wp_send_json_error();

		}
		wp_send_json_success();
	}

	private function download_template() {

		$this->ajax_nonce();

		$url  = esc_url( $_POST['url'] );
		$slug = basename( $_POST['slug'] );

		$result = mailster( 'templates' )->update_locally( $slug );

		// if this fails try to download it
		if ( ! $result ) {
			$result = mailster( 'templates' )->download_template( $url, $slug );
		}

		if ( is_wp_error( $result ) ) {
			switch ( $result->get_error_code() ) {
				case 'http_404':
					$err_data = $result->get_error_data();

					$return['msg'] = mailster()->get_update_error( $err_data['code'], true );
					break;
				default:
					$return['msg'] = sprintf( esc_html__( 'There was an error loading the template: %s', 'mailster' ), $result->get_error_message() );
					break;
			}
			wp_send_json_error( $return );
		}

		$return['msg']      = esc_html__( 'Template successful loaded!', 'mailster' );
		$return['redirect'] = $result;

		wp_send_json_success( $return );
	}

	private function default_template() {

		$this->ajax_nonce();

		$slug = basename( $_POST['slug'] );

		$result = mailster_update_option( 'default_template', $slug );

		if ( is_wp_error( $result ) ) {
			$return['msg'] = sprintf( esc_html__( 'There was an error using this template as default: %s', 'mailster' ), $result->get_error_message() );
			wp_send_json_error( $return );
		}

		$return['msg'] = esc_html__( 'New default template!', 'mailster' );

		wp_send_json_success( $return );
	}


	private function notice_dismiss() {

		if ( ! isset( $_POST['ids'] ) ) {
			wp_send_json_error();
		}

		$ids = (array) $_POST['ids'];

		if ( mailster( 'notices' )->remove( $ids ) ) {
			wp_send_json_success();
			exit;
		}

		wp_send_json_error();
	}





	private function ajax_filesystem() {
		if ( 'ftpext' == get_filesystem_method() && ! defined( 'FTP_HOST' ) && ! defined( 'FTP_USER' ) && ! defined( 'FTP_PASS' ) ) {
			$return['msg']  = esc_html__( 'WordPress is not able to access to your filesystem!', 'mailster' );
			$return['msg'] .= "\n" . sprintf( esc_html__( 'Please add following lines to the wp-config.php %s', 'mailster' ), "\n\ndefine('FTP_HOST', 'your-ftp-host');\ndefine('FTP_USER', 'your-ftp-user');\ndefine('FTP_PASS', 'your-ftp-password');\n" );

			wp_send_json_success( $return );
		}
	}


	private function load_geo_data() {

		$this->ajax_nonce();

		$result = mailster( 'geo' )->update( true );

		if ( is_wp_error( $result ) ) {
			$return['msg'] = sprintf( '%s<br><strong>%s</strong>', esc_html__( 'Couldn\'t load Location Database', 'mailster' ), $result->get_error_message() );
			wp_send_json_error( $return );
		}

		$return['update'] = esc_html__( 'Last update', 'mailster' ) . ': ' . esc_html__( 'right now', 'mailster' );
		$return['msg']    = esc_html__( 'Location Database success loaded!', 'mailster' );

		wp_send_json_success( $return );
	}


	private function sync_all_subscriber() {

		$limit  = 100;
		$offset = isset( $_POST['offset'] ) ? (int) $_POST['offset'] : 0;

		$return['count']  = mailster( 'subscribers' )->sync_all_subscriber( $limit, $offset );
		$return['offset'] = $limit + $offset;

		wp_send_json_success( $return );
	}


	private function sync_all_wp_user() {

		$limit  = 100;
		$offset = isset( $_POST['offset'] ) ? (int) $_POST['offset'] : 0;

		$return['count']  = mailster( 'subscribers' )->sync_all_wp_user( $limit, $offset );
		$return['offset'] = $limit + $offset;

		wp_send_json_success( $return );
	}


	private function bounce_test() {

		if ( isset( $_POST['formdata'] ) ) {
			parse_str( $_POST['formdata'], $formdata );
			mailster_update_option( $formdata['mailster_options'], true );
		}

		$identifier = 'mailster_bounce_test_' . md5( uniqid() );

		$return['identifier'] = $identifier;

		$mail          = mailster( 'mail' );
		$mail->to      = mailster_option( 'bounce' );
		$mail->subject = 'Mailster Bounce Test Mail';
		$mail->add_header( 'X-Mailster-Bounce-Identifier', $identifier );

		$replace = array(
			'preheader'    => 'You can delete this message!',
			'notification' => 'This message was sent from your WordPress blog to test your bounce server. You can delete this message!',
		);

		if ( ! $mail->send_notification( $identifier, $mail->subject, $replace ) ) {
			wp_send_json_error( $return );
		}

		wp_send_json_success( $return );
	}


	private function bounce_test_check() {

		$return['msg'] = '';

		if ( isset( $_POST['formdata'] ) ) {
			parse_str( $_POST['formdata'], $formdata );
			mailster_update_option( $formdata['mailster_options'], true );
		}

		$passes     = (int) $_POST['passes'];
		$identifier = $_POST['identifier'];

		$return['msg'] = esc_html__( 'checking for new messages', 'mailster' ) . str_repeat( '.', $passes );

		$result = mailster( 'bounce' )->test( $identifier );

		if ( $result ) {

			$return['complete'] = true;
			if ( is_wp_error( $result ) ) {

				$return['msg'] = $result->get_error_message();

			} else {

				$return['complete'] = true;
				$return['msg']      = esc_html__( 'Your bounce server is good!', 'mailster' );
			}
		} elseif ( $passes > 20 ) {

				$return['complete'] = true;
				$return['msg']      = esc_html__( 'Unable to get test message! Please check your settings.', 'mailster' );

		}

		wp_send_json_success( $return );
	}


	private function get_system_info() {

		$return['msg'] = 'You have no permission to access the stats';

		$this->ajax_nonce( json_encode( $return ) );

		if ( ! current_user_can( 'manage_options' ) ) {
			wp_send_json_success( $return );
		}

		$space   = 30;
		$infos   = mailster( 'settings' )->get_system_info( $space );
		$output  = "### Begin System Info ###\n\n";
		$output .= "## Please include this information when posting support requests ##\n\n";

		foreach ( $infos as $name => $value ) {
			if ( $value == '--' ) {
				$output .= "\n";
				continue;
			}
			$output .= $name . str_repeat( ' ', $space - strlen( $name ) ) . $value . "\n";
		}

		$output .= "### End System Info ###\n";

		$return['msg'] = $output;

		wp_send_json_success( $return );
	}


	private function get_gravatar() {

		$this->ajax_nonce();

		$email = esc_attr( $_POST['email'] );

		if ( ! get_option( 'show_avatars' ) ) {
			$return['url'] = null;
			wp_send_json_error( $return );
		}

		$return['url'] = mailster( 'subscribers' )->get_gravatar_uri( $email, 400 );
		wp_send_json_success( $return );
	}


	private function check_email() {

		$this->ajax_nonce();

		$email = esc_attr( $_POST['email'] );

		$subscriber       = mailster( 'subscribers' )->get_by_mail( $email );
		$return['exists'] = (bool) $subscriber && $subscriber->ID != (int) $_POST['id'];

		wp_send_json_success( $return );
	}

	private function spf_check() {

		$this->ajax_nonce();

		$return = array();

		if ( $spf_domain = mailster_option( 'spf_domain' ) ) {
			$records = mailster( 'helper' )->dns_query( $spf_domain, 'TXT' );

			$return['found'] = false;
			if ( $records ) {
				foreach ( $records as $r ) {
					if ( $r->type === 'TXT' && preg_match( '#v=spf1 #', $r->txt ) ) {
						$return['found'] = $r;
						break;
					}
				}
			}

			$return['message'] = sprintf( esc_html__( 'Domain %s', 'mailster' ), '<strong>' . $spf_domain . '</strong>' ) . ': ';

			if ( $return['found'] ) :

				$return['message'] .= '<code>' . esc_html__( 'TXT record found', 'mailster' ) . '</code>';

			else :

				$records = mailster( 'helper' )->dns_query( $spf_domain, 'A' );

				if ( $records ) {
					$ips = wp_list_pluck( (array) $records, 'ip' );
					$rec = 'v=spf1 mx a ip4:' . implode( ' ip4:', $ips ) . '  ~all';
				} else {
					$ips = array();
					$rec = 'v=spf1 mx a include:' . $spf_domain . ' ~all';
				}

				$return['message']  = sprintf( esc_html__( 'Domain %s', 'mailster' ), '<strong>' . $spf_domain . '</strong>' ) . ': ';
				$return['message'] .= '<code>' . esc_html__( 'no TXT record found', 'mailster' ) . '</code>';
				$return['message'] .= '<p>' . sprintf( esc_html__( 'No or wrong record found for %s. Please adjust the namespace records and add these lines:', 'mailster' ), '<strong>' . $spf_domain . '</strong>' ) . '</p>';

				$return['message'] .= '<dl><dt><strong>' . $spf_domain . '</strong> IN TXT</dt>';
				$return['message'] .= '<dd><textarea class="widefat" rows="1" id="spf-record" readonly>' . esc_textarea( apply_filters( 'mailster_spf_record', $rec ) ) . '</textarea><a class="clipboard" data-clipboard-target="#spf-record">' . esc_html__( 'copy', 'mailster' ) . '</a></dd></dl>';

			endif;

		}

		wp_send_json_success( $return );
	}


	private function dkim_check() {

		$this->ajax_nonce();

		$return = array();

		if ( $dkim_domain = mailster_option( 'dkim_domain' ) ) {
			$dkim_selector = mailster_option( 'dkim_selector' );
			$records       = mailster( 'helper' )->dns_query( mailster_option( 'dkim_selector' ) . '._domainkey.' . $dkim_domain, 'TXT' );

			$pubkey          = trim( str_replace( array( '-----BEGIN PUBLIC KEY-----', '-----END PUBLIC KEY-----', "\n", "\r" ), '', mailster_option( 'dkim_public_key' ) ) );
			$record          = apply_filters( 'mailster_dkim_record', 'k=rsa; p=' . $pubkey );
			$return['found'] = false;
			if ( $records ) {
				foreach ( (array) $records as $r ) {
					if ( $r->type === 'TXT' && preg_replace( '#[^a-zA-Z0-9]#s', '', str_replace( ';t=y', '', $r->txt ) ) == preg_replace( '#[^a-zA-Z0-9]#s', '', $record ) ) {
						$return['found'] = $r;
						break;
					}
				}
			}

			$return['message']  = sprintf( esc_html__( 'Domain %s', 'mailster' ), '<strong>' . $dkim_domain . '</strong>' ) . ': ';
			$return['message'] .= ' Selector: <strong>' . $dkim_selector . '</strong>: ';

			if ( $return['found'] ) :

				$return['message'] .= '<code>' . esc_html__( 'verified', 'mailster' ) . '</code>';

			else :

				$return['message'] .= '<code>' . esc_html__( 'not verified', 'mailster' ) . '</code>';
				$records            = mailster( 'helper' )->dns_query( $dkim_domain, 'A' );

				$return['message'] .= '<p>' . sprintf( esc_html__( 'No or wrong record found for %s. Please adjust the namespace records and add these lines:', 'mailster' ), '<strong>' . $dkim_domain . '</strong>' ) . '</p>';

				$return['message'] .= '<dl><dt><strong>' . $dkim_domain . '</strong> IN TXT</dt>';
				$return['message'] .= '<dl><dt><strong>' . $dkim_selector . '._domainkey.' . $dkim_domain . '</strong> IN TXT</dt><dd><textarea class="widefat" rows="4" id="dkim-record" readonly>' . esc_textarea( $record ) . '</textarea><a class="clipboard" data-clipboard-target="#dkim-record">' . esc_html__( 'copy', 'mailster' ) . '</a></dd></dl>';

			endif;

		}

		wp_send_json_success( $return );
	}


	private function create_list() {

		$this->ajax_nonce();

		$name        = stripslashes( $_POST['name'] );
		$campaign_id = (int) $_POST['id'];
		$listtype    = $_POST['listtype'];

		if ( ! mailster( 'campaigns' )->create_list_from_option( $name, $campaign_id, $listtype ) ) {
			$return['msg'] = esc_html__( 'Couldn\'t create List', 'mailster' );
			wp_send_json_error( $return );
		}
		$return['msg'] = sc_html__( 'List has been created', 'mailster' );

		wp_send_json_success( $return );
	}


	private function get_create_list_count() {

		$this->ajax_nonce();

		$campaign_id = (int) $_POST['id'];
		$listtype    = esc_attr( $_POST['listtype'] );

		$return['count'] = mailster( 'campaigns' )->create_list_from_option( '', $campaign_id, $listtype, true );

		wp_send_json_success( $return );
	}


	private function get_subscriber_count() {

		$this->ajax_nonce();

		wp_parse_str( $_POST['data'], $data );

		$lists      = isset( $data['lists'] ) ? (array) $data['lists'] : array();
		$nolists    = isset( $data['nolists'] ) ? (bool) $data['nolists'] : null;
		$conditions = false;
		if ( isset( $_POST['conditions'] ) ) {
			wp_parse_str( $_POST['conditions'], $conditions );
			if ( isset( $conditions['conditions'] ) ) {
				$conditions = $conditions['conditions'];
			}
		}
		$status = isset( $data['status'] ) ? (array) $data['status'] : -1;

		$args = array(
			'return_count' => true,
			'lists'        => $lists,
			'status'       => $status,
			'conditions'   => $conditions,
		);

		$return['count'] = mailster( 'subscribers' )->query( $args );
		if ( $nolists ) {
			$args['lists']    = -1;
			$return['count'] += mailster( 'subscribers' )->query( $args );
		}

		$return['count_formated'] = number_format_i18n( $return['count'] );

		wp_send_json_success( $return );
	}


	private function editor_image_upload_handler() {

		global $wpdb;

		$memory_limit       = ini_get( 'memory_limit' );
		$max_execution_time = ini_get( 'max_execution_time' );

		mailster_set_time_limit( 0 );

		if ( (int) $max_execution_time < 300 ) {
			ini_set( 'max_execution_time', 300 );
		}
		if ( (int) $memory_limit < 256 ) {
			ini_set( 'memory_limit', '256M' );
		}

		if ( ! isset( $_FILES['async-upload'] ) ) {
			return;
		}

		if ( ! function_exists( 'wp_handle_upload' ) ) {
			require_once ABSPATH . 'wp-admin/includes/file.php';
		}

		$width  = (int) $_POST['width'];
		$height = (int) $_POST['height'];
		$factor = (int) $_POST['factor'];
		$crop   = isset( $_POST['crop'] ) && $_POST['crop'] == 'true';

		$wp_upload_dir = wp_upload_dir();
		$image         = false;

		$filename = $_FILES['async-upload']['name'];

		if ( file_exists( $wp_upload_dir['path'] . '/' . $filename ) &&
			md5_file( $_FILES['async-upload']['tmp_name'] ) == md5_file( $wp_upload_dir['path'] . '/' . $filename ) ) {

			$url = $wp_upload_dir['url'] . '/' . $filename;
			if ( $attach_id = $wpdb->get_var( $wpdb->prepare( "SELECT ID FROM {$wpdb->posts} WHERE post_type = 'attachment' AND guid = %s;", $url ) ) ) {
				$image = mailster( 'helper' )->create_image( $attach_id, null, $width, $height, $crop );
			}
		}

		if ( ! $image ) {

			$result = wp_handle_upload(
				$_FILES['async-upload'],
				array(
					'test_form' => false,
					'mimes'     => array(
						'jpeg' => 'image/jpeg',
						'jpg'  => 'image/jpeg',
						'png'  => 'image/png',
						'tiff' => 'image/tiff',
						'tif'  => 'image/tiff',
						'gif'  => 'image/gif',
					),
				)
			);

			$filename = basename( $result['file'] );
			$filetype = wp_check_filetype( $filename, null );

			// don't add to library if alt key is pressed
			$add_to_library = ! ( $_POST['altKey'] == 'true' );

			if ( $add_to_library ) {

				$post_id = isset( $_POST['ID'] ) ? (int) $_POST['ID'] : 0;

				$attachment  = array(
					'guid'           => $wp_upload_dir['url'] . '/' . $filename,
					'post_mime_type' => $filetype['type'],
					'post_title'     => preg_replace( '/\.[^.]+$/', '', $filename ),
					'post_content'   => '',
					'post_status'    => 'inherit',
					'post_parent'    => $post_id,
				);
				$attach_id   = wp_insert_attachment( $attachment, $result['file'] );
				$attach_data = wp_generate_attachment_metadata( $attach_id, $result['file'] );
				wp_update_attachment_metadata( $attach_id, $attach_data );

				$image = mailster( 'helper' )->create_image( $attach_id, null, $width, $height, $crop );

			} else {

				$image = mailster( 'helper' )->create_image( null, $result['file'], $width, $height, $crop );

			}
		}

		if ( ! $image ) {
			wp_send_json_error( $return );
		}

		$return['name'] = $filename;
		if ( isset( $image['id'] ) ) {
			$return['name'] = get_post_field( 'post_title', $image['id'] );
		}

		$return['image'] = $image;

		wp_send_json_success( $return );
	}


	private function template_upload_handler() {

		global $wpdb;

		$this->ajax_nonce();

		$memory_limit       = ini_get( 'memory_limit' );
		$max_execution_time = ini_get( 'max_execution_time' );

		mailster_set_time_limit( 0 );

		if ( (int) $max_execution_time < 300 ) {
			ini_set( 'max_execution_time', 300 );
		}
		if ( (int) $memory_limit < 256 ) {
			ini_set( 'memory_limit', '256M' );
		}

		if ( ! isset( $_FILES['async-upload'] ) ) {
			return;
		}

		$upload_name = isset( $_FILES['async-upload']['name'] ) ? $_FILES['async-upload']['name'] : '';
		$filetype    = wp_check_filetype( $upload_name, array( 'zip' => 'application/zip' ) );

		if ( empty( $filetype['ext'] ) || 'zip' !== strtolower( $filetype['ext'] ) ) {
			$return['error'] = esc_html__( 'Only ZIP files are allowed.', 'mailster' );
			wp_send_json_error( $return );
		}

		if ( ! function_exists( 'wp_handle_upload' ) ) {
			require_once ABSPATH . 'wp-admin/includes/file.php';
		}

		$upload = wp_handle_upload(
			$_FILES['async-upload'],
			array(
				'test_form' => false,
				'test_type' => true,
				'mimes'     => array( 'zip' => 'application/zip' ),
			)
		);

		if ( isset( $upload['error'] ) ) {

			$return['error'] = $upload['error'];
			wp_send_json_error( $return );

		}

		$zip_file = $upload['file'];
		$result   = mailster( 'templates' )->unzip_template( $zip_file );

		if ( file_exists( $zip_file ) ) {
			$wp_filesystem = mailster_require_filesystem();
			if ( $wp_filesystem ) {
				$wp_filesystem->delete( $zip_file );
			} else {
				@unlink( $zip_file );
			}
		}

		if ( is_wp_error( $result ) ) {

			$return['error'] = $result->get_error_message();
			wp_send_json_error( $return );
		}

		mailster_notice( sprintf( esc_html__( 'Template %s has been uploaded', 'mailster' ), '"' . $result['name'] . ' ' . $result['version'] . '"' ), 'success', true );

		wp_send_json_success();
	}



	private function query_templates() {

		$this->ajax_nonce();

		$query = array(
			's'      => esc_attr( $_POST['search'] ),
			'browse' => esc_attr( $_POST['browse'] ),
			'type'   => esc_attr( $_POST['type'] ),
			'page'   => absint( $_POST['page'] ),
		);

		if ( ( isset( $_POST['reload_license'] ) && $_POST['reload_license'] === 'true' ) ) {
			mailster_freemius()->_sync_cron();
		}

		$result = mailster( 'templates' )->query( $query );

		if ( ! is_wp_error( $result ) ) {
			$return['total']     = $result['total'];
			$return['html']      = mailster( 'templates' )->result_to_html( $result, $query['browse'] );
			$return['templates'] = $result['items'];
			$return['error']     = $result['error'];
		}

		wp_send_json_success( $return );
	}


	private function template_endpoint() {

		$slug = basename( $_GET['slug'] );

		$this->ajax_nonce( 'Nonce Expired!', 'mailster_download_template_' . esc_attr( $slug ) );

		if ( isset( $_GET['download_url'] ) ) {
			?><script>window.opener.mailster.templates.downloadFromUrl('<?php echo esc_url( $_GET['download_url'] ); ?>', '<?php echo esc_attr( $slug ); ?>');window.close();</script>
			<?php
			exit;
		} elseif ( isset( $_GET['mailster_error'] ) ) {
			?>
			<script>window.opener.mailster.templates.error('<?php echo esc_attr( $slug ); ?>', '<?php echo esc_attr( $_GET['mailster_error'] ); ?>');window.close();</script>
			<?php
			exit;
		}

		$url = esc_url( $_GET['url'] );

		$location = add_query_arg(
			array(
				'redirect_to' => rawurlencode( add_query_arg( $_GET, admin_url( 'admin-ajax.php' ) ) ),
			),
			$url
		);

		mailster_redirect( $location );
		exit;
	}

	private function load_template_file() {

		$this->ajax_nonce();

		$template = basename( $_POST['template'] );
		$file     = basename( $_POST['file'] );
		$t        = mailster()->template( $template, $file );

		if ( ! $t->exists ) {
			wp_send_json_error();
		}
		$return['html'] = $t->get_raw_template( $file );
		wp_send_json_success( $return );
	}

	private function query_addons() {

		$this->ajax_nonce();

		$query = array(
			's'      => esc_attr( $_POST['search'] ),
			'browse' => esc_attr( $_POST['browse'] ),
			'type'   => esc_attr( $_POST['type'] ),
			'page'   => absint( $_POST['page'] ),
		);

		$result = mailster( 'addons' )->query( $query );

		if ( is_wp_error( $result ) ) {
			wp_send_json_error();
		}

		$return['total']  = $result['total'];
		$return['html']   = mailster( 'addons' )->result_to_html( $result );
		$return['addons'] = $result['items'];
		$return['error']  = $result['error'];

		wp_send_json_success( $return );
	}


	private function get_dashboard_data() {

		$this->ajax_nonce();

		$type = esc_attr( $_POST['type'] );
		$id   = (int) $_POST['id'];

		switch ( $type ) {
			case 'campaigns':
				if ( $campaign = mailster( 'campaigns' )->get( $id ) ) {
					$data           = array(
						'name'             => $campaign->post_title,
						'status'           => $campaign->post_status,
						'ID'               => $campaign->ID,
						'totals'           => mailster( 'campaigns' )->get_totals( $id ),
						'totals_formatted' => number_format_i18n( mailster( 'campaigns' )->get_totals( $id ) ),
						'sent'             => mailster( 'campaigns' )->get_sent( $id ),
						'sent_formatted'   => number_format_i18n( mailster( 'campaigns' )->get_sent( $id ) ),
						'openrate'         => mailster( 'campaigns' )->get_open_rate( $id ),
						'clickrate'        => mailster( 'campaigns' )->get_click_rate( $id ),
						'bouncerate'       => mailster( 'campaigns' )->get_bounce_rate( $id ),
						'unsubscriberate'  => mailster( 'campaigns' )->get_unsubscribe_rate( $id ),
					);
					$return['data'] = $data;
				}
				break;
			case 'lists':
				if ( $list = mailster( 'lists' )->get( $id ) ) {
					$data           = array(
						'name'             => $list->name,
						'ID'               => $list->ID,
						'totals'           => mailster( 'lists' )->get_totals( $id ),
						'totals_formatted' => number_format_i18n( mailster( 'lists' )->get_totals( $id ) ),
						'sent'             => mailster( 'lists' )->get_sent( $id ),
						'sent_formatted'   => number_format_i18n( mailster( 'lists' )->get_sent( $id ) ),
						'openrate'         => mailster( 'lists' )->get_open_rate( $id ),
						'clickrate'        => mailster( 'lists' )->get_click_rate( $id ),
						'bouncerate'       => mailster( 'lists' )->get_bounce_rate( $id ),
						'unsubscriberate'  => mailster( 'lists' )->get_unsubscribe_rate( $id ),
					);
					$return['data'] = $data;
				}
				break;

			default:
				break;
		}

		wp_send_json_success( $return );
	}


	private function get_dashboard_chart() {

		$this->ajax_nonce();
		$range           = isset( $_POST['range'] ) ? $_POST['range'] : '7 days';
		$return['chart'] = mailster( 'stats' )->get_dashboard( $range );

		wp_send_json_success( $return );
	}


	private function check_language() {

		$this->ajax_nonce();

		$return['language'] = mailster( 'translations' )->get_translation_data( true );

		if ( $return['language'] ) {

			if ( $return['language']['current'] ) {
				$return['html'] = esc_html__( 'An update to the Mailster translation is available!', 'mailster' );
			} else {
				$return['html'] = esc_html__( 'Mailster is available in your language!', 'mailster' );
			}
			$return['html'] .= ' <a class="load-language" href="#">' . esc_html__( 'load it', 'mailster' ) . '</a>';

		} elseif ( null === $return['language'] && get_user_locale() != 'en_US' ) {
				$return['html'] = esc_html__( 'Mailster is not available in your languages!', 'mailster' );

		} else {
			$return['html'] = '';
		}

		wp_send_json_success( $return );
	}


	private function load_language() {

		$this->ajax_nonce();

		if ( ! mailster( 'translations' )->download_language() ) {
			$return['html'] = esc_html__( 'Couldn\'t load language file. Please try again later.', 'mailster' );
			wp_send_json_error( $return );
		}

		$return['html'] = esc_html__( 'Language as been loaded successfully.', 'mailster' ) . ' ' . esc_html__( 'reloading', 'mailster' ) . '&hellip;';

		wp_send_json_success( $return );
	}


	private function convert() {

		$this->ajax_nonce();
		$email   = trim( $_POST['email'] );
		$license = trim( $_POST['license'] );
		$return  = array();

		$result = mailster( 'convert' )->convert( $email, $license );

		if ( is_wp_error( $result ) ) {
			$return['error'] = $result->get_error_message();
			$return['code']  = $result->get_error_code();
			wp_send_json_error( $return );
		}

		wp_send_json_success( $result );
	}


	private function envato_verify() {

		$this->ajax_nonce();

		if ( isset( $_GET['email'] ) ) {

			$args = array( trim( $_GET['slug'] ), trim( $_GET['purchasecode'] ), trim( $_GET['username'] ), trim( $_GET['email'] ) );

			?>
			<script>window.opener.verifymailster('<?php echo implode( "','", $args ); ?>');window.close();</script>
			<?php

			exit;

		} else {

			$slug = $_GET['slug'];

			$url = UpdateCenterPlugin::get( $slug, 'remote_url' );

			$url = add_query_arg(
				array(
					'envato-signup' => 1,
					'slug'          => $slug,
					'token'         => wp_create_nonce( 'mailster_nonce' ),
					'redirect'      => add_query_arg(
						array(
							'action'   => 'mailster_envato_verify',
							'_wpnonce' => wp_create_nonce( 'mailster_nonce' ),
						),
						admin_url( 'admin-ajax.php' )
					),
					'location'      => home_url(),
				),
				$url
			);

			mailster_redirect( $url );
			exit;
		}

		wp_send_json_success();
	}


	private function check_for_update() {

		$this->ajax_nonce();

		$return = mailster_freemius()->get_update( false, true, 1 );

		wp_send_json_success( $return );
	}


	private function quick_install() {

		$this->ajax_nonce();

		$plugin = sanitize_key( dirname( $_POST['plugin'] ) );
		$step   = sanitize_key( $_POST['step'] );

		$return = array();

		switch ( $step ) {
			case 'install':
				$success        = mailster( 'helper' )->install_plugin( $plugin );
				$return['next'] = 'activate';
				break;
			case 'activate':
				$success        = mailster( 'helper' )->activate_plugin( $plugin );
				$return['next'] = 'content';
				mailster_remove_notice( 'delivery_method' );
				break;
			case 'deactivate':
				$success = mailster( 'helper' )->deactivate_plugin( $plugin );
				break;
			case 'content':
				$context = (array) $_POST['context'];
				$action  = array_shift( $context );
				$args    = array_values( $context );

				ob_start();
				do_action_ref_array( "mailster_{$action}", $args );

				$content = ob_get_contents();

				ob_end_clean();
				$return['content'] = $content;
				$success           = true;
				break;
		}

		mailster( 'addons' )->reset_query_cache();

		if ( ! $success ) {
			wp_send_json_error( $return );
		}

		wp_send_json_success( $return );
	}


	private function wizard_save() {

		$mailster_options = mailster_options();

		$this->ajax_nonce();

		parse_str( $_POST['data'], $data );
		$id = sanitize_key( $_POST['id'] );

		switch ( $id ) {
			case 'homepage':
				// homepage exists => update
				if ( $homepage = get_post( mailster_option( 'homepage' ) ) ) {
					$homepage->post_title  = $data['post_title'];
					$homepage->post_status = 'publish';
					if ( isset( $data['post_name'] ) ) {
						$homepage->post_name = sanitize_title( $data['post_name'] );
					}
					$id = wp_insert_post( $homepage );

					// create new one
				} else {
					include MAILSTER_DIR . 'includes/static.php';
					$homepage                = wp_parse_args( $homepage, $mailster_homepage );
					$homepage['post_status'] = 'publish';
					$homepage['post_name']   = sanitize_title( $data['post_name'] );
					$id                      = wp_insert_post( $homepage );

				}

				if ( $id && ! is_wp_error( $id ) ) {
					mailster_remove_notice( 'no_homepage' );
					mailster_remove_notice( 'wrong_homepage_status' );
					mailster_update_option( 'homepage', $id );
					flush_rewrite_rules();
				}

				break;
			case 'templates':
				if ( isset( $data['mailster_options'] ) && isset( $data['mailster_options']['default_template'] ) ) {

					$template = $data['mailster_options']['default_template'];
					$result   = mailster( 'templates' )->download_by_slug( $template );
					mailster( 'templates' )->schedule_screenshot( $template, 'index.html', true, 1 );
					if ( ! is_wp_error( $result ) ) {
						$mailster_options = wp_parse_args( $data['mailster_options'], $mailster_options );
						update_option( 'mailster_options', $mailster_options );
					}
				}
				break;

			case 'finish':
				// maybe
				mailster( 'geo' )->maybe_update();
				update_option( 'mailster_setup', time() );
				// run this once
				do_action( 'mailster_cron' );

				// check for updates
				break;
			case 'basics':
			case 'sending':
				if ( isset( $data['mailster_options']['tags'] ) ) {
					$data['mailster_options']['tags'] = wp_parse_args( $data['mailster_options']['tags'], $mailster_options['tags'] );
				}
			case 'delivery':
			default:
				if ( isset( $data['mailster_options'] ) ) {
					$mailster_options = wp_parse_args( $data['mailster_options'], $mailster_options );
					update_option( 'mailster_options', $mailster_options );
				}
				break;
		}

		wp_send_json_success();
	}

	private function get_autocomplete_source() {

		$this->ajax_nonce();

		$field  = isset( $_POST['field'] ) ? (string) $_POST['field'] : null;
		$search = isset( $_POST['search'] ) ? (string) $_POST['search'] : null;
		$return = mailster( 'conditions' )->get_autocomplete_source( $field, $search );

		wp_send_json_success( $return );
	}

	private function test() {

		$test_id = isset( $_POST['test_id'] ) ? $_POST['test_id'] : null;

		$test               = mailster( 'test' );
		$success            = $test->run( $test_id );
		$return['message']  = $test->get_message();
		$return['nexttest'] = $test->get_next();
		$return['next']     = $test->nicename( $return['nexttest'] );
		$return['total']    = $test->get_total();
		$return['errors']   = $test->get_error_counts();
		$return['current']  = $test->get_current();
		$return['type']     = $test->get_current_type();

		if ( ! $success ) {
			wp_send_json_error( $return );
		}
		wp_send_json_success( $return );
	}

	private function get_beacon_data() {

		$this->ajax_nonce();
		$user = wp_get_current_user();

		$email = mailster()->get_email();
		if ( empty( $email ) ) {
			$email = $user->user_email;
		}

		$name = trim( $user->first_name . ' ' . $user->last_name );
		if ( empty( $name ) ) {
			$name = $user->nickname;
		}

		$return = array(
			'name'     => $name,
			'email'    => $email,
			'version'  => MAILSTER_VERSION,
			'avatar'   => get_avatar_url( $user->ID ),
			'id'       => 'a32295c1-a002-4dcb-b097-d15532bb73d6',
			'messages' => mailster_get_beacon_message(),
		);

		wp_send_json_success( $return );
	}


	/**
	 * Check whether a template filename is an allowed HTML file.
	 *
	 * @since [Unreleased]
	 *
	 * @param string $file Template filename.
	 * @return bool
	 */
	private function is_allowed_template_html_file( $file ) {
		$extension = strtolower( pathinfo( $file, PATHINFO_EXTENSION ) );

		return in_array( $extension, array( 'html', 'htm' ), true );
	}


	/**
	 * Resolve and validate a template file path inside the template directory.
	 *
	 * @since [Unreleased]
	 *
	 * @param string $slug Template slug.
	 * @param string $file Template filename.
	 * @return string|WP_Error
	 */
	private function get_template_file_path( $slug, $file ) {
		$slug = sanitize_file_name( basename( $slug ) );
		$file = basename( $file );

		if ( empty( $slug ) || empty( $file ) || false !== strpos( $file, "\0" ) ) {
			return new WP_Error( 'invalid_template_path', esc_html__( 'Not able to save file!', 'mailster' ) );
		}

		$templates_root = wp_normalize_path( mailster( 'templates' )->get_path() );
		$base_path      = wp_normalize_path( $templates_root . '/' . $slug );
		$file_path      = wp_normalize_path( $base_path . '/' . $file );

		if ( 0 !== strpos( $file_path, trailingslashit( $templates_root ) ) || 0 !== strpos( $file_path, trailingslashit( $base_path ) ) ) {
			return new WP_Error( 'invalid_template_path', esc_html__( 'Not able to save file!', 'mailster' ) );
		}

		return $file_path;
	}
}
