<?php
/**
 * This is the class that sends all the data back to the home site
 * It also handles opting in and deactivation
 * @version 1.1.2
 */

// Exit if accessed directly
if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

if( ! class_exists( 'Eael_Plugin_Usage_Tracker') ) {
	
	class Eael_Plugin_Usage_Tracker {
		
		private $wisdom_version = '1.1.2';
		private $home_url = '';
		private $plugin_file = '';
		private $plugin_name = '';
		private $options = array();
		private $require_optin = true;
		private $include_goodbye_form = true;
		private $marketing = false;
		private $collect_email = false;
		
		/**
		 * Class constructor
		 *
		 * @param $_home_url				The URL to the site we're sending data to
		 * @param $_plugin_file				The file path for this plugin
		 * @param $_options					Plugin options to track
		 * @param $_require_optin			Whether user opt-in is required (always required on WordPress.org)
		 * @param $_include_goodbye_form	Whether to include a form when the user deactivates
		 * @param $_marketing				Marketing method:
		 *									0: Don't collect email addresses
		 *									1: Request permission same time as tracking opt-in
		 *									2: Request permission after opt-in
		 */
		public function __construct( 
			$_plugin_file,
			$_home_url,
			$_options,
			$_require_optin=true,
			$_include_goodbye_form=true,
			$_marketing=false ) {

			$this->plugin_file = $_plugin_file;
			$this->home_url = trailingslashit( $_home_url );
			$this->plugin_name = basename( $this->plugin_file, '.php' );
			$this->options = $_options;
			$this->require_optin = $_require_optin;
			$this->include_goodbye_form = $_include_goodbye_form;
			$this->marketing = $_marketing;
			
			// Schedule some tracking when activated
			register_activation_hook( $this->plugin_file, array( $this, 'schedule_tracking' ) );
			// Deactivation hook
			register_deactivation_hook( $this->plugin_file, array( $this, 'deactivate_this_plugin' ) );
			
			// Get it going
			$this->init();
			
		}
		
		public function init() {
			// Check marketing
			if( $this->marketing == 3 ) {
				$this->set_can_collect_email( true, $this->plugin_name );
			}
			
			// Check whether opt-in is required
			// If not, then tracking is allowed
			if( ! $this->require_optin ) {
				$this->set_can_collect_email( true, $this->plugin_name );
				$this->set_is_tracking_allowed( true );
				$this->update_block_notice();
				$this->do_tracking( true );
			}

			// Hook our do_tracking function to the daily action
			add_action( 'put_do_weekly_action', array( $this, 'do_tracking' ) );

			// Use this action for local testing
			// add_action( 'admin_init', array( $this, 'do_tracking' ) );
			 
			// Display the admin notice on activation
			add_action( 'admin_notices', array( $this, 'optin_notice' ) );
			add_action( 'admin_notices', array( $this, 'marketing_notice' ) );

			// Deactivation
			add_filter( 'plugin_action_links_' . plugin_basename( $this->plugin_file ), array( $this, 'filter_action_links' ) );
			add_action( 'admin_footer-plugins.php', array( $this, 'goodbye_ajax' ) );
			add_action( 'wp_ajax_goodbye_form', array( $this, 'goodbye_form_callback' ) );
			
		}
		
		/**
		 * When the plugin is activated
		 * Create scheduled event
		 * And check if tracking is enabled - perhaps the plugin has been reactivated
		 *
		 * @since 1.0.0
		 */
		public function schedule_tracking() {
			// For historical reasons, this is called 'weekly' but is in fact daily
			if ( ! wp_next_scheduled( 'put_do_weekly_action' ) ) {
				wp_schedule_event( time(), 'daily', 'put_do_weekly_action' );
			}
		}
		
		/**
		 * This is our function to get everything going
		 * Check that user has opted in
		 * Collect data
		 * Then send it back
		 *
		 * @since 1.0.0
		 * @param $force	Force tracking if it's not time
		 */
		public function do_tracking( $force=false ) {
			// If the home site hasn't been defined, we just drop out. Nothing much we can do.
			if ( ! $this->home_url ) {
				return;
			}
	
			// Check to see if the user has opted in to tracking
			$allow_tracking = $this->get_is_tracking_allowed();
			if( ! $allow_tracking ) {
				return;
			}
			
			// Check to see if it's time to track
			$track_time = $this->get_is_time_to_track();
			if( ! $track_time && ! $force ) {
				return;
			}
			
			$this->set_admin_email();
	
			// Get our data
			$body = $this->get_data();

			// Send the data
			$this->send_data( $body );

		}
		
		/**
		 * Send the data to the home site
		 *
		 * @since 1.0.0
		 */
		public function send_data( $body ) {

			$request = wp_remote_post( 
				esc_url( $this->home_url . '?usage_tracker=hello' ),
				array(
					'method'      => 'POST',
					'timeout'     => 20,
					'redirection' => 5,
					'httpversion' => '1.1',
					'blocking'    => true,
					'body'        => $body,
					'user-agent'  => 'PUT/1.0.0; ' . get_bloginfo( 'url' )
				)
			);
			
			$this->set_track_time();
	
			if( is_wp_error( $request ) ) {
				return $request;
			}
			
		}
		
		/**
		 * Here we collect most of the data
		 * 
		 * @since 1.0.0
		 */
		public function get_data() {
	
			// Use this to pass error messages back if necessary
			$body['message'] = '';
	
			// Use this array to send data back
			$body = array(
				'plugin_slug'		=> sanitize_text_field( $this->plugin_name ),
				'url'				=> get_bloginfo( 'url' ),
				'site_name' 		=> get_bloginfo( 'name' ),
				'site_version'		=> get_bloginfo( 'version' ),
				'site_language'		=> get_bloginfo( 'language' ),
				'charset'			=> get_bloginfo( 'charset' ),
				'wisdom_version'	=> $this->wisdom_version,
				'php_version'		=> phpversion(),
				'multisite'			=> is_multisite(),
				'file_location'		=> __FILE__
			);
			
			// Collect the email if the correct option has been set
			if( $this->get_can_collect_email() ) {
				$body['email'] = $this->get_admin_email();
			}
			$body['marketing_method'] = $this->marketing;
	
			$body['server'] = isset( $_SERVER['SERVER_SOFTWARE'] ) ? $_SERVER['SERVER_SOFTWARE'] : '';

			// Retrieve current plugin information
			if( ! function_exists( 'get_plugins' ) ) {
				include ABSPATH . '/wp-admin/includes/plugin.php';
			}

			$plugins = array_keys( get_plugins() );
			$active_plugins = get_option( 'active_plugins', array() );

			foreach ( $plugins as $key => $plugin ) {
				if ( in_array( $plugin, $active_plugins ) ) {
					// Remove active plugins from list so we can show active and inactive separately
					unset( $plugins[$key] );
				}
			}

			$body['active_plugins'] = $active_plugins;
			$body['inactive_plugins'] = $plugins;

			// Check text direction
			$body['text_direction']	= 'LTR';
			if( function_exists( 'is_rtl' ) ) {
				if( is_rtl() ) {
					$body['text_direction']	= 'RTL';
				}
			} else {
				$body['text_direction']	= 'not set';
			}
	
			/**
			 * Get our plugin data
			 * Currently we grab plugin name and version
			 * Or, return a message if the plugin data is not available
			 * @since 1.0.0
			 */
			$plugin = $this->plugin_data();
			if( empty( $plugin ) ) {
				// We can't find the plugin data
				// Send a message back to our home site
				$body['message'] .= __( 'We can\'t detect any plugin information. This is most probably because you have not included the code in the plugin main file.', 'plugin-usage-tracker' );
				$body['status'] = 'Data not found'; // Never translated
			} else {
				if( isset( $plugin['Name'] ) ) {
					$body['plugin'] = sanitize_text_field( $plugin['Name'] );
				}
				if( isset( $plugin['Version'] ) ) {
					$body['version'] = sanitize_text_field( $plugin['Version'] );
				}
				$body['status'] = 'Active'; // Never translated
			}

			/**
			 * Get our plugin options
			 * @since 1.0.0
			 */
			$options = $this->options;
			$plugin_options = array();
			if( ! empty( $options ) && is_array( $options ) ) {
				foreach( $options as $option ) {
					$fields = get_option( $option );
					// Check for permission to send this option
					if( isset( $fields['wisdom_registered_setting'] ) ) {
						foreach( $fields as $key=>$value ) {
							$plugin_options[$key] = $value;
						}
					}
				}
			}
			$body['plugin_options'] = $this->options; // Returns array
			$body['plugin_options_fields'] = $plugin_options; // Returns object
	
			/**
			 * Get our theme data
			 * Currently we grab theme name and version
			 * @since 1.0.0
			 */
			$theme = wp_get_theme();
			if( $theme->Name ) {
				$body['theme'] = sanitize_text_field( $theme->Name );
			}
			if( $theme->Version ) {
				$body['theme_version'] = sanitize_text_field( $theme->Version );
			}

			// Return the data
			return $body;
	
		}
		
		/**
		 * Return plugin data
		 * @since 1.0.0
		 */
		public function plugin_data() {
			// Being cautious here
			if( ! function_exists( 'get_plugin_data' ) ) {
				include ABSPATH . '/wp-admin/includes/plugin.php';
			}
			// Retrieve current plugin information
			$plugin = get_plugin_data( $this->plugin_file );
			return $plugin;
		}

		/**
		 * Deactivating plugin
		 * @since 1.0.0
		 */
		public function deactivate_this_plugin() {
			// Check to see if the user has opted in to tracking
			$allow_tracking = $this->get_is_tracking_allowed();
			if( ! $allow_tracking ) {
				return;
			}
			$body = $this->get_data();
			$body['status'] = 'Deactivated'; // Never translated
			$body['deactivated_date'] = time();
			
			// Add deactivation form data
			if( false !== get_option( 'wisdom_deactivation_reason_' . $this->plugin_name ) ) {
				$body['deactivation_reason'] = get_option( 'wisdom_deactivation_reason_' . $this->plugin_name );
			}
			if( false !== get_option( 'wisdom_deactivation_details_' . $this->plugin_name ) ) {
				$body['deactivation_details'] = get_option( 'wisdom_deactivation_details_' . $this->plugin_name );
			}
			
			$this->send_data( $body );
			// Clear scheduled update
			wp_clear_scheduled_hook( 'put_do_weekly_action' );
		}
		
		/**
		 * Is tracking allowed?
		 * @since 1.0.0
		 */
		public function get_is_tracking_allowed() {
			// First, check if the user has changed their mind and opted out of tracking
			if( $this->has_user_opted_out() ) {
				$this->set_is_tracking_allowed( false, $this->plugin_name );
				return false;
			}
			// The wisdom_allow_tracking option is an array of plugins that are being tracked
			$allow_tracking = get_option( 'wisdom_allow_tracking' );
			// If this plugin is in the array, then tracking is allowed
			if( isset( $allow_tracking[$this->plugin_name] ) ) {
				return true;
			}
			return false;
		}
		
		/**
		 * Set if tracking is allowed
		 * Option is an array of all plugins with tracking permitted
		 * More than one plugin may be using the tracker
		 * @since 1.0.0
		 * @param $is_allowed	Boolean		true if tracking is allowed, false if not
		 */
		public function set_is_tracking_allowed( $is_allowed, $plugin=null ) {
			if( empty( $plugin ) ) {
				$plugin = $this->plugin_name;
			}
			// The wisdom_allow_tracking option is an array of plugins that are being tracked
			$allow_tracking = get_option( 'wisdom_allow_tracking' );
			
			// If the user has decided to opt out
			if( $this->has_user_opted_out() ) {
				if( isset( $allow_tracking[$plugin] ) ) {
					unset( $allow_tracking[$plugin] );
				}
			} else if( $is_allowed || ! $this->require_optin ) {
				// If the user has agreed to allow tracking or if opt-in is not required
				if( empty( $allow_tracking ) || ! is_array( $allow_tracking ) ) {
					// If nothing exists in the option yet, start a new array with the plugin name
					$allow_tracking = array( $plugin => $plugin );
				} else {
					// Else add the plugin name to the array
					$allow_tracking[$plugin] = $plugin;
				}
			} else {
				if( isset( $allow_tracking[$plugin] ) ) {
					unset( $allow_tracking[$plugin] );
				}
			}
			update_option( 'wisdom_allow_tracking', $allow_tracking );
		}
		
		/**
		 * Has the user opted out of allowing tracking?
		 * @since 1.1.0
		 * @return Boolean
		 */
		public function has_user_opted_out() {
			// Iterate through the options that are being tracked looking for wisdom_opt_out setting
			if( ! empty( $this->options ) ) {
				foreach( $this->options as $option_name ) {
					// Check each option
					$options = get_option( $option_name );
					// If we find the setting, return true
					if( ! empty( $options['wisdom_opt_out'] ) ) {
						return true;
					}
				}
			}
			return false;
		}
		
		/**
		 * Check if it's time to track
		 * @since 1.1.1
		 */
		public function get_is_time_to_track() {
			// Let's see if we're due to track this plugin yet
			$track_times = get_option( 'wisdom_last_track_time', array() );
			if( ! isset( $track_times[$this->plugin_name] ) ) {
				// If we haven't set a time for this plugin yet, then we must track it
				return true;
			} else {
				// If the time is set, let's see if it's more than a day ago
				if( $track_times[$this->plugin_name] < strtotime( '-1 day' ) ) {
					return true;
				}
			}
			return false;
		}
		
		/**
		 * Record the time we send tracking data
		 * @since 1.1.1
		 */
		public function set_track_time() {
			// We've tracked, so record the time
			$track_times = get_option( 'wisdom_last_track_time', array() );
			// Set different times according to plugin, in case we are tracking multiple plugins
			$track_times[$this->plugin_name] = time();
			update_option( 'wisdom_last_track_time', $track_times );
		}
		
		/**
		 * Set if we should block the opt-in notice for this plugin
		 * Option is an array of all plugins that have received a response from the user
		 * @since 1.0.0
		 */
		public function update_block_notice( $plugin=null ) {
			if( empty( $plugin ) ) {
				$plugin = $this->plugin_name;
			}
			$block_notice = get_option( 'wisdom_block_notice' );
			if( empty( $block_notice ) || ! is_array( $block_notice ) ) {
				// If nothing exists in the option yet, start a new array with the plugin name
				$block_notice = array( $plugin => $plugin );
			} else {
				// Else add the plugin name to the array
				$block_notice[$plugin] = $plugin;
			}
			update_option( 'wisdom_block_notice', $block_notice );
		}
		
		/**
		 * Can we collect the email address?
		 * @since 1.0.0
		 */
		public function get_can_collect_email() {
			// The wisdom_collect_email option is an array of plugins that are being tracked
			$collect_email = get_option( 'wisdom_collect_email' );
			// If this plugin is in the array, then we can collect the email address
			if( isset( $collect_email[$this->plugin_name] ) ) {
				return true;
			}
			return false;
		}
		
		/**
		 * Set if user has allowed us to collect their email address
		 * Option is an array of all plugins with email collection permitted
		 * More than one plugin may be using the tracker
		 * @since 1.0.0
		 * @param $can_collect	Boolean		true if collection is allowed, false if not
		 */
		public function set_can_collect_email( $can_collect, $plugin=null ) {
			if( empty( $plugin ) ) {
				$plugin = $this->plugin_name;
			}
			// The wisdom_collect_email option is an array of plugins that are being tracked
			$collect_email = get_option( 'wisdom_collect_email' );
			// If the user has agreed to allow tracking or if opt-in is not required
			if( $can_collect ) {
				if( empty( $collect_email ) || ! is_array( $collect_email ) ) {
					// If nothing exists in the option yet, start a new array with the plugin name
					$collect_email = array( $plugin => $plugin );
				} else {
					// Else add the plugin name to the array
					$collect_email[$plugin] = $plugin;
				}
			} else {
				if( isset( $collect_email[$plugin] ) ) {
					unset( $collect_email[$plugin] );
				}
			}
			update_option( 'wisdom_collect_email', $collect_email );
		}
		
		/**
		 * Get the correct email address to use
		 * @since 1.1.2
		 * @return Email address
		 */
		public function get_admin_email() {
			// The wisdom_collect_email option is an array of plugins that are being tracked
			$email = get_option( 'wisdom_admin_emails' );
			// If this plugin is in the array, then we can collect the email address
			if( isset( $email[$this->plugin_name] ) ) {
				return $email[$this->plugin_name];
			}
			return false;
		}
		
		/**
		 * Set the correct email address to use
		 * There might be more than one admin on the site
		 * So we only use the first admin's email address
		 * @param $email	Email address to set
		 * @param $plugin	Plugin name to set email address for
		 * @since 1.1.2
		 */
		public function set_admin_email( $email=null, $plugin=null ) {
			if( empty( $plugin ) ) {
				$plugin = $this->plugin_name;
			}
			// If no email address passed, try to get the current user's email
			if( empty( $email ) ) {
				// Have to check that current user object is available
				if( function_exists( 'wp_get_current_user' ) ) {
					$current_user = wp_get_current_user();
					$email = $current_user->user_email;
				}
			}
			// The wisdom_admin_emails option is an array of admin email addresses
			$admin_emails = get_option( 'wisdom_admin_emails' );
			if( empty( $admin_emails ) || ! is_array( $admin_emails ) ) {
				// If nothing exists in the option yet, start a new array with the plugin name
				$admin_emails = array( $plugin => sanitize_email( $email ) );
			} else if( empty( $admin_emails[$plugin] ) ) {
				// Else add the email address to the array, if not already set
				$admin_emails[$plugin] = sanitize_email( $email );
			}
			update_option( 'wisdom_admin_emails', $admin_emails );
		}
		
		/**
		 * Display the admin notice to users to allow them to opt in
		 *
		 * @since 1.0.0
		 */
		public function optin_notice() {
			// Check for plugin args
			if( isset( $_GET['plugin'] ) && isset( $_GET['plugin_action'] ) ) {
				$plugin = sanitize_text_field( $_GET['plugin'] );
				$action = sanitize_text_field( $_GET['plugin_action'] );
				if( $action == 'yes' ) {
					$this->set_is_tracking_allowed( true, $plugin );
					$this->do_tracking( true ); // Run this straightaway
				} else {
					$this->set_is_tracking_allowed( false, $plugin );
				}
				$this->update_block_notice( $plugin );
			}
			
			// Check whether to block the notice, e.g. because we're in a local environment
			// wisdom_block_notice works the same as wisdom_allow_tracking, an array of plugin names
			$block_notice = get_option( 'wisdom_block_notice' );
			if( isset( $block_notice[$this->plugin_name] ) ) {
				return;
			}

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

			// @credit EDD
			// Don't bother asking user to opt in if they're in local dev
			if ( stristr( network_site_url( '/' ), 'local' ) !== false || stristr( network_site_url( '/' ), 'localhost' ) !== false || stristr( network_site_url( '/' ), ':8888' ) !== false ) {
				$this->update_block_notice();
			} else {
				
				// Display the notice requesting permission to track
				// Retrieve current plugin information
				$plugin = $this->plugin_data();
				$plugin_name = $plugin['Name'];
				
				// Args to add to query if user opts in to tracking
				$yes_args = array(
					'plugin' 		=> $this->plugin_name,
					'plugin_action'	=> 'yes'
				);
				
				// Decide how to request permission to collect email addresses
				if( $this->marketing == 1 ) {
					// Option 1 combines permissions to track and collect email
					$yes_args['marketing_optin'] = 'yes';
				} else if( $this->marketing == 2 ) {
					// Option 2 enables a second notice that fires after the user opts in to tracking
					$yes_args['marketing'] = 'yes';
				}
				$url_yes = add_query_arg( $yes_args );
				$url_no = add_query_arg( array(
					'plugin' 		=> $this->plugin_name,
					'plugin_action'	=> 'no'
				) );
				
				// Decide on notice text
				if( $this->marketing != 1 ) {
					// Standard notice text
					$notice_text = __( 'Thank you for installing our plugin. We would like to track its usage on your site. We don\'t record any sensitive data, only information regarding the WordPress environment and plugin settings, which we will use to help us make improvements to the plugin. Tracking is completely optional.', 'plugin-usage-tracker' );
				} else {
					// If we have option 1 for marketing, we include reference to sending product information here
					$notice_text = __( 'Want to help make <strong>Essential Addons for Elementor</strong> even more awesome? You can get a <strong>25% discount coupon</strong> for Pro upgrade if you allow. <a class="insights-data-we-collect" href="#">What we collect.</a>', 'plugin-usage-tracker' );
				}
				// And we allow you to filter the text anyway
				$notice_text = apply_filters( 'wisdom_notice_text_' . esc_attr( $this->plugin_name ), $notice_text ); ?>
							
				<div class="notice notice-info updated put-dismiss-notice">
					<p><?php echo __( $notice_text ); ?></p>
					<div class="eael-insights-data" style="display: none;">
						<p><?php echo __( 'We collect non-sensitive diagnostic data and plugin usage information. Your site URL, WordPress & PHP version, plugins & themes and email address to send you the discount coupon. This data lets us make sure this plugin always stays compatible with the most popular plugins and themes. No spam, I promise.' ); ?></p>
					</div>
					<p>
						<a href="<?php echo esc_url( $url_yes ); ?>" class="button-primary"><?php _e( 'Allow', 'plugin-usage-tracker' ); ?></a>
						<a href="<?php echo esc_url( $url_no ); ?>" class="button-secondary"><?php _e( 'No Thanks', 'plugin-usage-tracker' ); ?></a>
					</p>
		            <?php echo "<script type='text/javascript'>jQuery('.insights-data-we-collect').on('click', function(e) {
		                    e.preventDefault();
		                    jQuery('.eael-insights-data').slideToggle('fast');
		                });
		                </script>";?>
				</div>
			<?php
			}
			
		}
		
		/**
		 * Display the marketing notice to users if enabled
		 * Only displays after the user has opted in to tracking
		 *
		 * @since 1.0.0
		 */
		public function marketing_notice() {
			// Check if user has opted in to marketing
			if( isset( $_GET['marketing_optin'] ) ) {
				// Set marketing optin
				$this->set_can_collect_email( sanitize_text_field( $_GET['marketing_optin'] ), $this->plugin_name );
				// Do tracking
				$this->do_tracking( true );
			} else if( isset( $_GET['marketing'] ) && $_GET['marketing']=='yes' ) {
				// Display the notice requesting permission to collect email address
				// Retrieve current plugin information
				$plugin = $this->plugin_data();
				$plugin_name = $plugin['Name'];

				$url_yes = add_query_arg( array(
					'plugin' 			=> $this->plugin_name,
					'marketing_optin'	=> 'yes'
				) );
				$url_no = add_query_arg( array(
					'plugin' 			=> $this->plugin_name,
					'marketing_optin'	=> 'no'
				) );
				
				$marketing_text = __( 'Thank you for opting in to tracking. Would you like to receive occasional news about this plugin, including details of new features and special offers?', 'plugin-usage-tracker' );
				$marketing_text = apply_filters( 'wisdom_marketing_text_' . esc_attr( $this->plugin_name ), $marketing_text ); ?>
				
				<div class="notice notice-info updated put-dismiss-notice">
					<p><?php echo '<strong>' . esc_html( $plugin_name ) . '</strong>'; ?></p>
					<p><?php echo esc_html( $marketing_text ); ?></p>
					<p>
						<a href="<?php echo esc_url( $url_yes ); ?>" data-putnotice="yes" class="button-secondary"><?php _e( 'Yes Please', 'plugin-usage-tracker' ); ?></a>
						<a href="<?php echo esc_url( $url_no ); ?>" data-putnotice="no" class="button-secondary"><?php _e( 'No Thank You', 'plugin-usage-tracker' ); ?></a>
					</p>
				</div>
				<?php }
		}
		
		/**
		 * Filter the deactivation link to allow us to present a form when the user deactivates the plugin
		 * @since 1.0.0
		 */
		public function filter_action_links( $links ) {
			// Check to see if the user has opted in to tracking
			if( ! $this->get_is_tracking_allowed() ) {
				return $links;
			}
			if( isset( $links['deactivate'] ) && $this->include_goodbye_form ) {
				$deactivation_link = $links['deactivate'];
				// Insert an onClick action to allow form before deactivating
				$deactivation_link = str_replace( '<a ', '<div class="put-goodbye-form-wrapper"><span class="put-goodbye-form" id="put-goodbye-form-' . esc_attr( $this->plugin_name ) . '"></span></div><a onclick="javascript:event.preventDefault();" id="put-goodbye-link-' . esc_attr( $this->plugin_name ) . '" ', $deactivation_link );
				$links['deactivate'] = $deactivation_link;
			}
			return $links;
		}
		
		/*
		 * Form text strings
		 * These are non-filterable and used as fallback in case filtered strings aren't set correctly
		 * @since 1.0.0
		 */
		public function form_default_text() {
			$form = array();
			$form['heading'] = __( 'Sorry to see you go', 'plugin-usage-tracker' );
			$form['body'] = __( 'Before you deactivate the plugin, would you quickly give us your reason for doing so?', 'plugin-usage-tracker' );
			$form['options'] = array(
				__( 'Set up is too difficult', 'plugin-usage-tracker' ),
				__( 'Lack of documentation', 'plugin-usage-tracker' ),
				__( 'Not the features I wanted', 'plugin-usage-tracker' ),
				__( 'Found a better plugin', 'plugin-usage-tracker' ),
				__( 'Installed by mistake', 'plugin-usage-tracker' ),
				__( 'Only required temporarily', 'plugin-usage-tracker' ),
				__( 'Didn\'t work', 'plugin-usage-tracker' )
			);
			$form['details'] = __( 'Details (optional)', 'plugin-usage-tracker' );
			return $form;
		}
		
		/**
		 * Form text strings
		 * These can be filtered
		 * The filter hook must be unique to the plugin
		 * @since 1.0.0
		 */
		public function form_filterable_text() {
			$form = $this->form_default_text();
			return apply_filters( 'wisdom_form_text_' . esc_attr( $this->plugin_name ), $form );
		}
		
		/**
		 * Form text strings
		 * These can be filtered
		 * @since 1.0.0
		 */
		public function goodbye_ajax() {
			// Get our strings for the form
			$form = $this->form_filterable_text();
			if( ! isset( $form['heading'] ) || ! isset( $form['body'] ) || ! isset( $form['options'] ) || ! is_array( $form['options'] ) || ! isset( $form['details'] ) ) {
				// If the form hasn't been filtered correctly, we revert to the default form
				$form = $this->form_default_text();
			}
			// Build the HTML to go in the form
			$html = '<div class="put-goodbye-form-head"><strong>' . esc_html( $form['heading'] ) . '</strong></div>';
			$html .= '<div class="put-goodbye-form-body"><p>' . esc_html( $form['body'] ) . '</p>';
			if( is_array( $form['options'] ) ) {
				$html .= '<div class="put-goodbye-options"><p>';
				foreach( $form['options'] as $option ) {
					$html .= '<input type="checkbox" name="put-goodbye-options[]" id="' . str_replace( " ", "", esc_attr( $option ) ) . '" value="' . esc_attr( $option ) . '"> <label for="' . str_replace( " ", "", esc_attr( $option ) ) . '">' . esc_attr( $option ) . '</label><br>';
				}
				$html .= '</p><label for="put-goodbye-reasons">' . esc_html( $form['details'] ) .'</label><textarea name="put-goodbye-reasons" id="put-goodbye-reasons" rows="2" style="width:100%"></textarea>';
				$html .= '</div><!-- .put-goodbye-options -->';
			}
			$html .= '</div><!-- .put-goodbye-form-body -->';
			$html .= '<p class="deactivating-spinner"><span class="spinner"></span> ' . __( 'Submitting form', 'plugin-usage-tracker' ) . '</p>';
			?>
			<div class="put-goodbye-form-bg"></div>
			<style type="text/css">
				.put-form-active .put-goodbye-form-bg {
					background: rgba( 0, 0, 0, .5 );
					position: fixed;
					top: 0;
					left: 0;
					width: 100%;
					height: 100%;
				}
				.put-goodbye-form-wrapper {
					position: relative;
					z-index: 999;
					display: none;
				}
				.put-form-active .put-goodbye-form-wrapper {
					display: block;
				}
				.put-goodbye-form {
					display: none;
				}
				.put-form-active .put-goodbye-form {
					position: absolute;
				    bottom: 30px;
				    left: 0;
					max-width: 400px;
				    background: #fff;
					white-space: normal;
				}
				.put-goodbye-form-head {
					background: #0073aa;
					color: #fff;
					padding: 8px 18px;
				}
				.put-goodbye-form-body {
					padding: 8px 18px;
					color: #444;
				}
				.deactivating-spinner {
					display: none;
				}
				.deactivating-spinner .spinner {
					float: none;
					margin: 4px 4px 0 18px;
					vertical-align: bottom;
					visibility: visible;
				}
				.put-goodbye-form-footer {
					padding: 8px 18px;
				}
			</style>
			<script>
				jQuery(document).ready(function($){
					$("#put-goodbye-link-<?php echo esc_attr( $this->plugin_name ); ?>").on("click",function(){
						// We'll send the user to this deactivation link when they've completed or dismissed the form
						var url = document.getElementById("put-goodbye-link-<?php echo esc_attr( $this->plugin_name ); ?>");
						$('body').toggleClass('put-form-active');
						$("#put-goodbye-form-<?php echo esc_attr( $this->plugin_name ); ?>").fadeIn();
						$("#put-goodbye-form-<?php echo esc_attr( $this->plugin_name ); ?>").html( '<?php echo $html; ?>' + '<div class="put-goodbye-form-footer"><p><a id="put-submit-form" class="button primary" href="#"><?php _e( 'Submit and Deactivate', 'plugin-usage-tracker' ); ?></a>&nbsp;<a class="secondary button" href="'+url+'"><?php _e( 'Just Deactivate', 'plugin-usage-tracker' ); ?></a></p></div>');
						$('#put-submit-form').on('click', function(e){
							// As soon as we click, the body of the form should disappear
							$("#put-goodbye-form-<?php echo esc_attr( $this->plugin_name ); ?> .put-goodbye-form-body").fadeOut();
							$("#put-goodbye-form-<?php echo esc_attr( $this->plugin_name ); ?> .put-goodbye-form-footer").fadeOut();
							// Fade in spinner
							$("#put-goodbye-form-<?php echo esc_attr( $this->plugin_name ); ?> .deactivating-spinner").fadeIn();
							e.preventDefault();
							var values = new Array();
							$.each($("input[name='put-goodbye-options[]']:checked"), function(){
								values.push($(this).val());
							});
							var details = $('#put-goodbye-reasons').val();
							var data = {
								'action': 'goodbye_form',
								'values': values,
								'details': details,
								'security': "<?php echo wp_create_nonce ( 'wisdom_goodbye_form' ); ?>",
								'dataType': "json"
							}
							$.post(
								ajaxurl,
								data,
								function(response){
									// Redirect to original deactivation URL
									window.location.href = url;
								}
							);
						});
						// If we click outside the form, the form will close
						$('.put-goodbye-form-bg').on('click',function(){
							$("#put-goodbye-form-<?php echo esc_attr( $this->plugin_name ); ?>").fadeOut();
							$('body').removeClass('put-form-active');
						});
					});
				});
			</script>
		<?php }
		
		/**
		 * AJAX callback when the form is submitted
		 * @since 1.0.0
		 */
		public function goodbye_form_callback() {
			check_ajax_referer( 'wisdom_goodbye_form', 'security' );
			if( isset( $_POST['values'] ) ) {
				$values = json_encode( wp_unslash( $_POST['values'] ) );
				update_option( 'wisdom_deactivation_reason_' . $this->plugin_name, $values );
			}
			if( isset( $_POST['details'] ) ) {
				$details = sanitize_text_field( $_POST['details'] );
				update_option( 'wisdom_deactivation_details_' . $this->plugin_name, $details );
			}
			$this->do_tracking(); // Run this straightaway
			echo 'success';
			wp_die();
		}
		
	}
	
}