<?php

class Jetpack_Subscriptions_Widget extends WP_Widget {

	const ID_BASE = 'blog_subscription';

	static $instance_count = 0;

	/**
	 * @var array When printing the submit button, what tags are allowed
	 */
	public static $allowed_html_tags_for_submit_button = array(
		'br'     => array(),
		's'      => array(),
		'strong' => array(),
		'em'     => array(),
	);

	/**
	 * Use this variable when printing the message after submitting an email in subscription widgets
	 *
	 * @var array what tags are allowed
	 */
	public static $allowed_html_tags_for_message = array(
		'a'  => array(
			'href'   => array(),
			'title'  => array(),
			'rel'    => array(),
			'target' => array(),
		),
		'br' => array(),
	);

	function __construct() {
		$widget_ops = array(
			'classname'                   => 'widget_blog_subscription jetpack_subscription_widget',
			'description'                 => __( 'Add an email signup form to allow people to subscribe to your blog.', 'jetpack' ),
			'customize_selective_refresh' => true,
			'show_instance_in_rest'       => true,
		);

		$name = self::is_jetpack() ?
			/** This filter is documented in modules/widgets/facebook-likebox.php */
			apply_filters( 'jetpack_widget_name', __( 'Blog Subscriptions', 'jetpack' ) ) :
			__( 'Follow Blog', 'jetpack' );

		parent::__construct(
			'blog_subscription',
			$name,
			$widget_ops
		);

		if ( self::is_jetpack() &&
		     (
			     is_active_widget( false, false, $this->id_base ) ||
			     is_active_widget( false, false, 'monster' ) ||
			     is_customize_preview()
		     )
		) {
			add_action( 'wp_enqueue_scripts', array( $this, 'enqueue_style' ) );
		}

		add_filter( 'widget_types_to_hide_from_legacy_widget_block', array( $this, 'hide_widget_in_block_editor' ) );
	}

	/**
	 * Remove Social Icons widget from Legacy Widget block.
	 *
	 * @param array $widget_types Widget type data.
	 * This only applies to new blocks being added.
	 */
	public function hide_widget_in_block_editor( $widget_types ) {
		$widget_types[] = self::ID_BASE;
		return $widget_types;
	}

	/**
	 * Enqueue the form's CSS.
	 *
	 * @since 4.5.0
	 */
	public function enqueue_style() {
		wp_register_style(
			'jetpack-subscriptions',
			plugins_url( 'subscriptions.css', __FILE__ ),
			array(),
			JETPACK__VERSION
		);
		wp_enqueue_style( 'jetpack-subscriptions' );
	}

	/**
	 * Renders a full widget either within the context of WordPress widget, or in response to a shortcode.
	 *
	 * @param array $args Display arguments including 'before_title', 'after_title', 'before_widget', and 'after_widget'.
	 * @param array $instance The settings for the particular instance of the widget.
	 */
	function widget( $args, $instance ) {
		if ( self::is_jetpack() &&
		     /** This filter is documented in modules/contact-form/grunion-contact-form.php */
		     false === apply_filters( 'jetpack_auto_fill_logged_in_user', false )
		) {
			$subscribe_email = '';
		} else {
			$current_user = wp_get_current_user();
			if ( ! empty( $current_user->user_email ) ) {
				$subscribe_email = esc_attr( $current_user->user_email );
			} else {
				$subscribe_email = '';
			}
		}

		$stats_action = self::is_jetpack() ? 'jetpack_subscriptions' : 'follow_blog';
		/** This action is documented in modules/widgets/gravatar-profile.php */
		do_action( 'jetpack_stats_extra', 'widget_view', $stats_action );

		$after_widget  = isset( $args['after_widget'] ) ? $args['after_widget'] : '';
		$before_widget = isset( $args['before_widget'] ) ? $args['before_widget'] : '';
		$instance      = wp_parse_args( (array) $instance, $this->defaults() );

		echo $before_widget;

		Jetpack_Subscriptions_Widget::$instance_count ++;

		self::render_widget_title( $args, $instance );

		self::render_widget_status_messages( $instance );

		self::render_widget_subscription_form( $args, $instance, $subscribe_email );

		echo "\n" . $after_widget;
	}

	/**
	 * Prints the widget's title. If show_only_email_and_button is true, we will not show a title.
	 *
	 * @param array $args Display arguments including 'before_title', 'after_title', 'before_widget', and 'after_widget'.
	 * @param array $instance The settings for the particular instance of the widget.
	 */
	static function render_widget_title( $args, $instance ) {
		$show_only_email_and_button = $instance['show_only_email_and_button'];
		$before_title               = isset( $args['before_title'] ) ? $args['before_title'] : '';
		$after_title                = isset( $args['after_title'] ) ? $args['after_title'] : '';
		if ( self::is_wpcom() && ! $show_only_email_and_button ) {
			if ( self::is_current_user_subscribed() ) {
				if ( ! empty( $instance['title_following'] ) ) {
					echo $before_title . '<label for="subscribe-field' . ( Jetpack_Subscriptions_Widget::$instance_count > 1 ? '-' . Jetpack_Subscriptions_Widget::$instance_count : '' ) . '">' . esc_attr( $instance['title_following'] ) . '</label>' . $after_title . "\n";
				}
			} else {
				if ( ! empty( $instance['title'] ) ) {
					echo $before_title . '<label for="subscribe-field' . ( Jetpack_Subscriptions_Widget::$instance_count > 1 ? '-' . Jetpack_Subscriptions_Widget::$instance_count : '' ) . '">' . esc_attr( $instance['title'] ) . '</label>' . $after_title . "\n";
				}
			}
		}

		if ( self::is_jetpack() && empty( $instance['show_only_email_and_button'] ) ) {
			echo $args['before_title'] . esc_attr( $instance['title'] ) . $args['after_title'] . "\n";
		}
	}

	/**
	 * Prints the subscription block's status messages after someone has attempted to subscribe.
	 * Either a success message or an error message.
	 *
	 * @param array $instance The settings for the particular instance of the widget.
	 */
	static function render_widget_status_messages( $instance ) {
		if ( self::is_jetpack() && isset( $_GET['subscribe'] ) ) {
			$success_message   = isset( $instance['success_message'] ) ? stripslashes( $instance['success_message'] ) : '';
			$subscribers_total = self::fetch_subscriber_count();
			switch ( $_GET['subscribe'] ) :
				case 'invalid_email' : ?>
                    <p class="error"><?php esc_html_e( 'The email you entered was invalid. Please check and try again.', 'jetpack' ); ?></p>
					<?php break;
				case 'opted_out' : ?>
                    <p class="error"><?php printf( __( 'The email address has opted out of subscription emails. <br /> You can manage your preferences at <a href="%1$s" title="%2$s" target="_blank">subscribe.wordpress.com</a>', 'jetpack' ),
							'https://subscribe.wordpress.com/',
							__( 'Manage your email preferences.', 'jetpack' )
						); ?></p>
					<?php break;
				case 'already' : ?>
                    <p class="error"><?php printf( __( 'You have already subscribed to this site. Please check your inbox. <br /> You can manage your preferences at <a href="%1$s" title="%2$s" target="_blank">subscribe.wordpress.com</a>', 'jetpack' ),
							'https://subscribe.wordpress.com/',
							__( 'Manage your email preferences.', 'jetpack' )
						); ?></p>
					<?php break;
				case 'many_pending_subs':
					?>
					<p class="error">
						<?php
						printf(
							wp_kses(
								/* translators: 1: Link to Subscription Management page https://subscribe.wordpress.com/, 2: Description of this link */
								__( 'You already have several pending email subscriptions. <br /> Approve or delete a few subscriptions at <a href="%1$s" title="%2$s" target="_blank" rel="noopener noreferrer">subscribe.wordpress.com</a> before continuing.', 'jetpack' ),
								self::$allowed_html_tags_for_message
							),
							'https://subscribe.wordpress.com/',
							esc_attr__( 'Manage your email preferences.', 'jetpack' )
						);
						?>
					</p>
					<?php break;
				case 'pending':
					?>
					<p class="error">
						<?php
						printf(
							wp_kses(
								/* translators: 1: Link to Subscription Management page https://subscribe.wordpress.com/, 2: Description of this link */
								__( 'You subscribed this site before but you have not clicked the confirmation link yet. Please check your inbox. <br /> Otherwise, you can manage your preferences at <a href="%1$s" title="%2$s" target="_blank" rel="noopener noreferrer">subscribe.wordpress.com</a>.', 'jetpack' ),
								self::$allowed_html_tags_for_message
							),
							'https://subscribe.wordpress.com/',
							esc_attr__( 'Manage your email preferences.', 'jetpack' )
						);
						?>
					</p>
					<?php
					break;
				case 'success' : ?>
                    <div class="success"><?php echo wpautop( str_replace( '[total-subscribers]', number_format_i18n( $subscribers_total['value'] ), $success_message ) ); ?></div>
					<?php break;
				default : ?>
                    <p class="error"><?php esc_html_e( 'There was an error when subscribing. Please try again.', 'jetpack' ); ?></p>
					<?php break;
			endswitch;
		}

		if ( self::is_wpcom() && self::wpcom_has_status_message() ) {
			global $themecolors;
			$message = '';

			switch ( $_GET['blogsub'] ) {
				case 'confirming':
					$message = __( 'Thanks for subscribing! You&rsquo;ll get an email with a link to confirm your subscription. If you don&rsquo;t get it, please <a href="https://en.support.wordpress.com/contact/">contact us</a>.', 'jetpack' );
					break;
				case 'blocked':
					$message = __( 'Subscriptions have been blocked for this email address.', 'jetpack' );
					break;
				case 'flooded':
					$message = __( 'You already have several pending email subscriptions. Approve or delete a few through your <a href="https://subscribe.wordpress.com/">Subscription Manager</a> before attempting to subscribe to more blogs.', 'jetpack' );
					break;
				case 'spammed':
					/* translators: %s is a URL */
					$message = sprintf( __( 'Because there are many pending subscriptions for this email address, we have blocked the subscription. Please <a href="%s">activate or delete</a> pending subscriptions before attempting to subscribe.', 'jetpack' ), 'https://subscribe.wordpress.com/' );
					break;
				case 'subscribed':
					$message = __( 'You&rsquo;re already subscribed to this site.', 'jetpack' );
					break;
				case 'pending':
					$message = __( 'You have a pending subscription already; we just sent you another email. Click the link or <a href="https://en.support.wordpress.com/contact/">contact us</a> if you don&rsquo;t receive it.', 'jetpack' );
					break;
				case 'confirmed':
					$message = __( 'Congrats, you&rsquo;re subscribed! You&rsquo;ll get an email with the details of your subscription and an unsubscribe link.', 'jetpack' );
					break;
			}

			$border_color = isset( $themecolors['border'] ) ? " #{$themecolors['border']}" : '';

			$redirect_fragment = self::get_redirect_fragment();
			printf(
				'<div id="%1$s" class="jetpack-sub-notification" style="border: 1px solid%2$s; padding-left: 5px; padding-right: 5px; margin-bottom: 10px;">%3$s</div>',
				esc_attr( $redirect_fragment ),
				esc_attr( $border_color ),
				wp_kses_post( $message )
			);
		}
	}

	/**
	 * Generates the redirect fragment used after form submission.
	 *
	 * @param string $id is the specific id that will appear in the redirect fragment. If none is provided self::$instance_count will be used.
	 */
	protected static function get_redirect_fragment( $id = null ) {
		if ( is_null( $id ) ) {
			return 'subscribe-blog' . ( self::$instance_count > 1 ? '-' . self::$instance_count : '' );
		}

		return 'subscribe-blog-' . $id;
	}

	/**
	 * Renders a form allowing folks to subscribe to the blog.
	 *
	 * @param array $args Display arguments including 'before_title', 'after_title', 'before_widget', and 'after_widget'.
	 * @param array $instance The settings for the particular instance of the widget.
	 * @param string $subscribe_email The email to use to prefill the form.
	 */
	static function render_widget_subscription_form( $args, $instance, $subscribe_email ) {
		$show_only_email_and_button   = $instance['show_only_email_and_button'];
		$show_subscribers_total       = (bool) $instance['show_subscribers_total'];
		$subscribe_text               = empty( $instance['show_only_email_and_button'] ) ?
			stripslashes( $instance['subscribe_text'] ) :
			false;
		$referer                      = ( is_ssl() ? 'https' : 'http' ) . '://' . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];
		$source                       = 'widget';
		$widget_id                    = ! empty( $args['widget_id'] ) ? $args['widget_id'] : self::$instance_count;
		$subscribe_button             = ! empty( $instance['submit_button_text'] ) ? $instance['submit_button_text'] : $instance['subscribe_button'];
		$subscribers_total            = self::fetch_subscriber_count();
		$subscribe_placeholder        = isset( $instance['subscribe_placeholder'] ) ? stripslashes( $instance['subscribe_placeholder'] ) : '';
		$submit_button_classes        = isset( $instance['submit_button_classes'] ) ? 'wp-block-button__link ' . $instance['submit_button_classes'] : 'wp-block-button__link';
		$submit_button_styles         = isset( $instance['submit_button_styles'] ) ? $instance['submit_button_styles'] : '';
		$submit_button_wrapper_styles = isset( $instance['submit_button_wrapper_styles'] ) ? $instance['submit_button_wrapper_styles'] : '';
		$email_field_classes          = isset( $instance['email_field_classes'] ) ? $instance['email_field_classes'] : '';
		$email_field_styles           = isset( $instance['email_field_styles'] ) ? $instance['email_field_styles'] : '';

		if ( self::is_wpcom() && ! self::wpcom_has_status_message() ) {
			global $current_blog;

			$url     = defined( 'SUBSCRIBE_BLOG_URL' ) ? SUBSCRIBE_BLOG_URL : '';
			$form_id = self::get_redirect_fragment();
			?>

			<form
				action="<?php echo esc_url( $url ); ?>"
				method="post"
				accept-charset="utf-8"
				id="<?php echo esc_attr( $form_id ); ?>"
			>
				<?php
				if ( ! $show_only_email_and_button ) {
					// phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped
					echo wpautop( $subscribe_text );
				}
				if ( $show_subscribers_total && $subscribers_total ) {
					?>
					<div class="jetpack-subscribe-count">
						<p>
						<?php
						/* translators: %s: number of folks following the blog */
						echo esc_html( sprintf( _n( 'Join %s other follower', 'Join %s other followers', $subscribers_total, 'jetpack' ), number_format_i18n( $subscribers_total ) ) );
						?>
						</p>
					</div>
					<?php
				}
				$email_field_id  = 'subscribe-field';
				$email_field_id .= self::$instance_count > 1
					? '-' . self::$instance_count
					: '';
				$label_field_id  = $email_field_id . '-label';
				?>
				<p id="subscribe-email">
					<label
						id="<?php echo esc_attr( $label_field_id ); ?>"
						for="<?php echo esc_attr( $email_field_id ); ?>"
						class="screen-reader-text"
					>
						<?php echo esc_html__( 'Email Address:', 'jetpack' ); ?>
					</label>

					<?php
					printf(
						'<input
							type="email"
							name="email"
							%1$s
							style="%2$s"
							placeholder="%3$s"
							value=""
							id="%4$s"
						/>',
						( ! empty( $email_field_classes )
							? 'class="' . esc_attr( $email_field_classes ) . '"'
							: ''
						),
						( ! empty( $email_field_styles )
							? esc_attr( $email_field_styles )
							: 'width: 95%; padding: 1px 10px'
						),
						esc_attr__( 'Enter your email address', 'jetpack' ),
						esc_attr( $email_field_id )
					);
					?>
				</p>

				<p id="subscribe-submit"
					<?php if ( ! empty( $submit_button_wrapper_styles ) ) { ?>
						style="<?php echo esc_attr( $submit_button_wrapper_styles ); ?>"
					<?php }; ?>
				>
                    <input type="hidden" name="action" value="subscribe"/>
                    <input type="hidden" name="blog_id" value="<?php echo (int) $current_blog->blog_id; ?>"/>
                    <input type="hidden" name="source" value="<?php echo esc_url( $referer ); ?>"/>
                    <input type="hidden" name="sub-type" value="<?php echo esc_attr( $source ); ?>"/>
					<input type="hidden" name="redirect_fragment" value="<?php echo esc_attr( $form_id ); ?>"/>
					<?php wp_nonce_field( 'blogsub_subscribe_' . $current_blog->blog_id, '_wpnonce', false ); ?>
                    <button type="submit"
	                    <?php if ( ! empty( $submit_button_classes ) ) { ?>
	                        class="<?php echo esc_attr( $submit_button_classes ); ?>"
	                    <?php }; ?>
		                <?php if ( ! empty( $submit_button_styles ) ) { ?>
			                style="<?php echo esc_attr( $submit_button_styles ); ?>"
		                <?php }; ?>
	                >
	                    <?php
	                    echo wp_kses(
		                    $subscribe_button,
		                    self::$allowed_html_tags_for_submit_button
	                    );
	                    ?>
                    </button>
                </p>
            </form>
			<?php
		}

		if ( self::is_jetpack() ) {
			/**
			 * Filter the subscription form's ID prefix.
			 *
			 * @module subscriptions
			 *
			 * @since 2.7.0
			 *
			 * @param string subscribe-field Subscription form field prefix.
			 * @param int $widget_id Widget ID.
			 */
			$subscribe_field_id = apply_filters( 'subscribe_field_id', 'subscribe-field', $widget_id );

			$form_id = self::get_redirect_fragment( $widget_id );
			?>
			<form action="#" method="post" accept-charset="utf-8" id="<?php echo esc_attr( $form_id ); ?>">
				<?php
				if ( $subscribe_text && ( ! isset ( $_GET['subscribe'] ) || 'success' != $_GET['subscribe'] ) ) {
					?>
                    <div id="subscribe-text"><?php echo wpautop( str_replace( '[total-subscribers]', number_format_i18n( $subscribers_total['value'] ), $subscribe_text ) ); ?></div><?php
				}

				if ( $show_subscribers_total && 0 < $subscribers_total['value'] ) {
					?>
					<div class="jetpack-subscribe-count">
						<p>
						<?php
						/* translators: %s: number of folks following the blog */
						echo esc_html( sprintf( _n( 'Join %s other subscriber', 'Join %s other subscribers', $subscribers_total['value'], 'jetpack' ), number_format_i18n( $subscribers_total['value'] ) ) );
						?>
						</p>
					</div>
					<?php
				}
				if ( ! isset ( $_GET['subscribe'] ) || 'success' != $_GET['subscribe'] ) { ?>
                    <p id="subscribe-email">
                        <label id="jetpack-subscribe-label"
							class="screen-reader-text"
							for="<?php echo esc_attr( $subscribe_field_id . '-' . $widget_id ); ?>">
							<?php echo ! empty( $subscribe_placeholder ) ? esc_html( $subscribe_placeholder ) : esc_html__( 'Email Address:', 'jetpack' ); ?>
                        </label>
                        <input type="email" name="email" required="required"
                        	<?php if ( ! empty( $email_field_classes ) ) { ?>
	                            class="<?php echo esc_attr( $email_field_classes ); ?> required"
                            <?php }; ?>
		                    <?php if ( ! empty( $email_field_styles ) ) { ?>
			                    style="<?php echo esc_attr( $email_field_styles ); ?>"
		                    <?php }; ?>
                            value="<?php echo esc_attr( $subscribe_email ); ?>"
							id="<?php echo esc_attr( $subscribe_field_id . '-' . $widget_id ); ?>"
                            placeholder="<?php echo esc_attr( $subscribe_placeholder ); ?>"
                        />
                    </p>

					<p id="subscribe-submit"
						<?php if ( ! empty( $submit_button_wrapper_styles ) ) { ?>
							style="<?php echo esc_attr( $submit_button_wrapper_styles ); ?>"
						<?php }; ?>
					>
                        <input type="hidden" name="action" value="subscribe"/>
                        <input type="hidden" name="source" value="<?php echo esc_url( $referer ); ?>"/>
                        <input type="hidden" name="sub-type" value="<?php echo esc_attr( $source ); ?>"/>
						<input type="hidden" name="redirect_fragment" value="<?php echo esc_attr( $form_id ); ?>"/>
						<?php
						if ( is_user_logged_in() ) {
							wp_nonce_field( 'blogsub_subscribe_' . get_current_blog_id(), '_wpnonce', false );
						}
						?>
                        <button type="submit"
	                        <?php if ( ! empty( $submit_button_classes ) ) { ?>
	                            class="<?php echo esc_attr( $submit_button_classes ); ?>"
                            <?php }; ?>
		                    <?php if ( ! empty( $submit_button_styles ) ) { ?>
			                    style="<?php echo esc_attr( $submit_button_styles ); ?>"
		                    <?php }; ?>
	                        name="jetpack_subscriptions_widget"
	                    >
	                        <?php
	                        echo wp_kses(
		                        $subscribe_button,
		                        self::$allowed_html_tags_for_submit_button
	                        ); ?>
                        </button>
                    </p>
				<?php } ?>
            </form>
		<?php }
	}

	/**
	 * Determines if the current user is subscribed to the blog.
	 *
	 * @return bool Is the person already subscribed.
	 */
	static function is_current_user_subscribed() {
		$subscribed = isset( $_GET['subscribe'] ) && 'success' == $_GET['subscribe'];

		if ( self::is_wpcom() && class_exists( 'Blog_Subscription' ) && class_exists( 'Blog_Subscriber' ) ) {
			$subscribed = is_user_logged_in() && Blog_Subscription::is_subscribed( new Blog_Subscriber() );
		}

		return $subscribed;
	}

	/**
	 * Is this script running in the wordpress.com environment?
	 *
	 * @return bool
	 */
	static function is_wpcom() {
		return defined( 'IS_WPCOM' ) && IS_WPCOM;
	}

	/**
	 * Is this script running in a self-hosted environment?
	 *
	 * @return bool
	 */
	static function is_jetpack() {
		return ! self::is_wpcom();
	}

	/**
	 * Used to determine if there is a valid status slug within the wordpress.com environment.
	 *
	 * @return bool
	 */
	static function wpcom_has_status_message() {
		return isset( $_GET['blogsub'] ) &&
		       in_array(
			       $_GET['blogsub'],
			       array(
				       'confirming',
				       'blocked',
				       'flooded',
				       'spammed',
				       'subscribed',
				       'pending',
				       'confirmed',
			       )
		       );
	}

	/**
	 * Determine the amount of folks currently subscribed to the blog.
	 *
	 * @return int|array
	 */
	static function fetch_subscriber_count() {
		$subs_count = 0;

		if ( self::is_jetpack() ) {
			$subs_count = get_transient( 'wpcom_subscribers_total' );
			if ( false === $subs_count || 'failed' == $subs_count['status'] ) {
				$xml = new Jetpack_IXR_Client();

				$xml->query( 'jetpack.fetchSubscriberCount' );

				if ( $xml->isError() ) { // if we get an error from .com, set the status to failed so that we will try again next time the data is requested
					$subs_count = array(
						'status'  => 'failed',
						'code'    => $xml->getErrorCode(),
						'message' => $xml->getErrorMessage(),
						'value'   => ( isset( $subs_count['value'] ) ) ? $subs_count['value'] : 0,
					);
				} else {
					$subs_count = array(
						'status' => 'success',
						'value'  => $xml->getResponse(),
					);
				}

				set_transient( 'wpcom_subscribers_total', $subs_count, 3600 ); // try to cache the result for at least 1 hour
			}
		}

		if ( self::is_wpcom() && function_exists( 'wpcom_reach_total_for_blog' ) ) {
			$subs_count = wpcom_reach_total_for_blog();
		}

		return $subs_count;
	}

	/**
	 * Updates a particular instance of a widget when someone saves it in wp-admin.
	 *
	 * @param array $new_instance
	 * @param array $old_instance
	 *
	 * @return array
	 */
	function update( $new_instance, $old_instance ) {
		$instance = $old_instance;

		if ( self::is_jetpack() ) {
			$instance['title']                 = wp_kses( stripslashes( $new_instance['title'] ), array() );
			$instance['subscribe_placeholder'] = wp_kses( stripslashes( $new_instance['subscribe_placeholder'] ), array() );
			$instance['subscribe_button']      = wp_kses( stripslashes( $new_instance['subscribe_button'] ), array() );
			$instance['success_message']       = wp_kses( stripslashes( $new_instance['success_message'] ), array() );
		}

		if ( self::is_wpcom() ) {
			$instance['title']               = strip_tags( stripslashes( $new_instance['title'] ) );
			$instance['title_following']     = strip_tags( stripslashes( $new_instance['title_following'] ) );
			$instance['subscribe_logged_in'] = wp_filter_post_kses( stripslashes( $new_instance['subscribe_logged_in'] ) );
			$instance['subscribe_button']    = strip_tags( stripslashes( $new_instance['subscribe_button'] ) );
		}

		$instance['show_subscribers_total']     = isset( $new_instance['show_subscribers_total'] ) && $new_instance['show_subscribers_total'];
		$instance['show_only_email_and_button'] = isset( $new_instance['show_only_email_and_button'] ) && $new_instance['show_only_email_and_button'];
		$instance['subscribe_text']             = wp_filter_post_kses( stripslashes( $new_instance['subscribe_text'] ) );

		return $instance;
	}

	/**
	 * The default args for rendering a subscription form.
	 *
	 * @return array
	 */
	static function defaults() {
		$defaults = array(
			'show_subscribers_total'     => true,
			'show_only_email_and_button' => false
		);

		$defaults['title']                 = esc_html__( 'Subscribe to Blog via Email', 'jetpack' );
		$defaults['subscribe_text']        = esc_html__( 'Enter your email address to subscribe to this blog and receive notifications of new posts by email.', 'jetpack' );
		$defaults['subscribe_placeholder'] = esc_html__( 'Email Address', 'jetpack' );
		$defaults['subscribe_button']      = esc_html__( 'Subscribe', 'jetpack' );
		$defaults['success_message']       = esc_html__( "Success! An email was just sent to confirm your subscription. Please find the email now and click 'Confirm Follow' to start subscribing.", 'jetpack' );

		return $defaults;
	}

	/**
	 * Renders the widget's options form in wp-admin.
	 *
	 * @param array $instance
	 */
	function form( $instance ) {
		$instance               = wp_parse_args( (array) $instance, $this->defaults() );
		$show_subscribers_total = checked( $instance['show_subscribers_total'], true, false );


		if ( self::is_wpcom() ) {
			$title               = esc_attr( stripslashes( $instance['title'] ) );
			$title_following     = esc_attr( stripslashes( $instance['title_following'] ) );
			$subscribe_text      = esc_attr( stripslashes( $instance['subscribe_text'] ) );
			$subscribe_logged_in = esc_attr( stripslashes( $instance['subscribe_logged_in'] ) );
			$subscribe_button    = esc_attr( stripslashes( $instance['subscribe_button'] ) );
			$subscribers_total   = self::fetch_subscriber_count();
		}

		if ( self::is_jetpack() ) {
			$title                 = stripslashes( $instance['title'] );
			$subscribe_text        = stripslashes( $instance['subscribe_text'] );
			$subscribe_placeholder = stripslashes( $instance['subscribe_placeholder'] );
			$subscribe_button      = stripslashes( $instance['subscribe_button'] );
			$success_message       = stripslashes( $instance['success_message'] );
			$subs_fetch            = self::fetch_subscriber_count();
			if ( 'failed' == $subs_fetch['status'] ) {
				printf( '<div class="error inline"><p>%s: %s</p></div>', esc_html( $subs_fetch['code'] ), esc_html( $subs_fetch['message'] ) );
			}
			$subscribers_total = number_format_i18n( $subs_fetch['value'] );
		}

		if ( self::is_wpcom() ) : ?>
            <p>
                <label for="<?php echo $this->get_field_id( 'title' ); ?>">
					<?php _e( 'Widget title for non-followers:' ); ?>
                    <input class="widefat" id="<?php echo $this->get_field_id( 'title' ); ?>"
                           name="<?php echo $this->get_field_name( 'title' ); ?>" type="text"
                           value="<?php echo $title; ?>"/>
                </label>
            </p>
            <p>
                <label for="<?php echo $this->get_field_id( 'title_following' ); ?>">
					<?php _e( 'Widget title for followers:' ); ?>
                    <input class="widefat" id="<?php echo $this->get_field_id( 'title_following' ); ?>"
                           name="<?php echo $this->get_field_name( 'title_following' ); ?>" type="text"
                           value="<?php echo $title_following; ?>"/>
                </label>
            </p>
            <p>
                <label for="<?php echo $this->get_field_id( 'subscribe_logged_in' ); ?>">
					<?php _e( 'Optional text to display to logged in WordPress.com users:' ); ?>
                    <textarea style="width: 95%" id="<?php echo $this->get_field_id( 'subscribe_logged_in' ); ?>"
                              name="<?php echo $this->get_field_name( 'subscribe_logged_in' ); ?>"
                              type="text"><?php echo $subscribe_logged_in; ?></textarea>
                </label>
            </p>
            <p>
                <label for="<?php echo $this->get_field_id( 'subscribe_text' ); ?>">
					<?php _e( 'Optional text to display to non-WordPress.com users:' ); ?>
                    <textarea style="width: 95%" id="<?php echo $this->get_field_id( 'subscribe_text' ); ?>"
                              name="<?php echo $this->get_field_name( 'subscribe_text' ); ?>"
                              type="text"><?php echo $subscribe_text; ?></textarea>
                </label>
            </p>
            <p>
                <label for="<?php echo $this->get_field_id( 'subscribe_button' ); ?>">
					<?php _e( 'Follow Button Text:' ); ?>
                    <input class="widefat" id="<?php echo $this->get_field_id( 'subscribe_button' ); ?>"
                           name="<?php echo $this->get_field_name( 'subscribe_button' ); ?>" type="text"
                           value="<?php echo $subscribe_button; ?>"/>
                </label>
            </p>
            <p>
                <label for="<?php echo $this->get_field_id( 'show_subscribers_total' ); ?>">
                    <input type="checkbox" id="<?php echo $this->get_field_id( 'show_subscribers_total' ); ?>"
                           name="<?php echo $this->get_field_name( 'show_subscribers_total' ); ?>"
                           value="1"<?php echo $show_subscribers_total; ?> />
					<?php echo esc_html( sprintf( _n( 'Show total number of followers? (%s follower)', 'Show total number of followers? (%s followers)', $subscribers_total ), number_format_i18n( $subscribers_total ) ) ); ?>
                </label>
            </p>
		<?php endif;

		if ( self::is_jetpack() ) : ?>
            <p>
                <label for="<?php echo $this->get_field_id( 'title' ); ?>">
					<?php _e( 'Widget title:', 'jetpack' ); ?>
                    <input class="widefat" id="<?php echo $this->get_field_id( 'title' ); ?>"
                           name="<?php echo $this->get_field_name( 'title' ); ?>" type="text"
                           value="<?php echo esc_attr( $title ); ?>"/>
                </label>
            </p>
            <p>
                <label for="<?php echo $this->get_field_id( 'subscribe_text' ); ?>">
					<?php _e( 'Optional text to display to your readers:', 'jetpack' ); ?>
                    <textarea class="widefat" id="<?php echo $this->get_field_id( 'subscribe_text' ); ?>"
                              name="<?php echo $this->get_field_name( 'subscribe_text' ); ?>"
                              rows="3"><?php echo esc_html( $subscribe_text ); ?></textarea>
                </label>
            </p>
            <p>
                <label for="<?php echo $this->get_field_id( 'subscribe_placeholder' ); ?>">
					<?php esc_html_e( 'Subscribe Placeholder:', 'jetpack' ); ?>
                    <input class="widefat" id="<?php echo $this->get_field_id( 'subscribe_placeholder' ); ?>"
                           name="<?php echo $this->get_field_name( 'subscribe_placeholder' ); ?>" type="text"
                           value="<?php echo esc_attr( $subscribe_placeholder ); ?>"/>
                </label>
            </p>
            <p>
                <label for="<?php echo $this->get_field_id( 'subscribe_button' ); ?>">
					<?php _e( 'Subscribe Button:', 'jetpack' ); ?>
                    <input class="widefat" id="<?php echo $this->get_field_id( 'subscribe_button' ); ?>"
                           name="<?php echo $this->get_field_name( 'subscribe_button' ); ?>" type="text"
                           value="<?php echo esc_attr( $subscribe_button ); ?>"/>
                </label>
            </p>
            <p>
                <label for="<?php echo $this->get_field_id( 'success_message' ); ?>">
					<?php _e( 'Success Message Text:', 'jetpack' ); ?>
                    <textarea class="widefat" id="<?php echo $this->get_field_id( 'success_message' ); ?>"
                              name="<?php echo $this->get_field_name( 'success_message' ); ?>"
                              rows="5"><?php echo esc_html( $success_message ); ?></textarea>
                </label>
            </p>
            <p>
                <label for="<?php echo $this->get_field_id( 'show_subscribers_total' ); ?>">
                    <input type="checkbox" id="<?php echo $this->get_field_id( 'show_subscribers_total' ); ?>"
                           name="<?php echo $this->get_field_name( 'show_subscribers_total' ); ?>"
                           value="1"<?php echo $show_subscribers_total; ?> />
					<?php echo esc_html( sprintf( _n( 'Show total number of subscribers? (%s subscriber)', 'Show total number of subscribers? (%s subscribers)', $subscribers_total, 'jetpack' ), $subscribers_total ) ); ?>
                </label>
            </p>
		<?php endif;
	}
}

if ( defined( 'IS_WPCOM' ) && IS_WPCOM && function_exists( 'class_alias' ) ) {
	class_alias( 'Jetpack_Subscriptions_Widget', 'Blog_Subscription_Widget' );
}

function get_jetpack_blog_subscriptions_widget_classname() {
	return ( defined( 'IS_WPCOM' ) && IS_WPCOM ) ?
		'Blog_Subscription_Widget' :
		'Jetpack_Subscriptions_Widget';
}

function jetpack_do_subscription_form( $instance ) {
	if ( empty( $instance ) || ! is_array( $instance ) ) {
		$instance = array();
	}

	if ( empty( $instance['show_subscribers_total'] ) || 'false' === $instance['show_subscribers_total'] ) {
		$instance['show_subscribers_total'] = false;
	} else {
		$instance['show_subscribers_total'] = true;
	}

	$show_only_email_and_button             = isset( $instance['show_only_email_and_button'] ) ? $instance['show_only_email_and_button'] : false;
	$submit_button_text                     = isset( $instance['submit_button_text'] ) ? $instance['submit_button_text'] : '';

	// Build up a string with the submit button's classes and styles and set it on the instance
	$submit_button_classes        = isset( $instance['submit_button_classes'] ) ? $instance['submit_button_classes'] : '';
	$email_field_classes          = isset( $instance['email_field_classes'] ) ? $instance['email_field_classes'] : '';
	$style                        = '';
	$submit_button_styles         = '';
	$submit_button_wrapper_styles = '';
	$email_field_styles           = '';

	if ( isset( $instance['custom_background_button_color'] ) && 'undefined' !== $instance['custom_background_button_color'] ) {
		$submit_button_styles .= 'background: ' . $instance['custom_background_button_color'] . '; ';
	}
	if ( isset( $instance['custom_text_button_color'] ) && 'undefined' !== $instance['custom_text_button_color'] ) {
		$submit_button_styles .= 'color: ' . $instance['custom_text_button_color'] . '; ';
	}
	if ( isset( $instance['custom_button_width'] ) && 'undefined' !== $instance['custom_button_width'] ) {
		$submit_button_wrapper_styles .= 'width: ' . $instance['custom_button_width'] . '; ';
		$submit_button_wrapper_styles .= 'max-width: 100%; ';

		// Account for custom margins on inline forms.
		if (
			! empty( $instance['custom_spacing'] ) &&
			! ( isset( $instance['button_on_newline'] ) && 'true' === $instance['button_on_newline'] )
		) {
			$submit_button_styles .= 'width: calc(100% - ' . $instance['custom_spacing'] . 'px); ';
		} else {
			$submit_button_styles .= 'width: 100%; ';
		}
	}

	if ( isset( $instance['custom_font_size'] ) && 'undefined' !== $instance['custom_font_size'] ) {
		$style  = 'font-size: ' . $instance['custom_font_size'];
		$style .= is_numeric( $instance['custom_font_size'] ) ? 'px; ' : '; '; // Handle deprecated numeric font size values.

		$submit_button_styles .= $style;
		$email_field_styles   .= $style;
	}
	if ( isset( $instance['custom_padding'] ) && 'undefined' !== $instance['custom_padding'] ) {
		$style = 'padding: ' .
			$instance['custom_padding'] . 'px ' .
			round( $instance['custom_padding'] * 1.5 ) . 'px ' .
			$instance['custom_padding'] . 'px ' .
			round( $instance['custom_padding'] * 1.5 ) . 'px; ';

		$submit_button_styles .= $style;
		$email_field_styles   .= $style;
	}

	$button_spacing = 0;
	if ( ! empty( $instance['custom_spacing'] ) ) {
		$button_spacing = $instance['custom_spacing'];
	}
	if ( isset( $instance['button_on_newline'] ) && 'true' === $instance['button_on_newline'] ) {
		$submit_button_styles .= 'margin-top: ' . $button_spacing . 'px; ';
	} else {
		$submit_button_styles .= 'margin-left: ' . $button_spacing . 'px; ';
	}

	if ( isset( $instance['custom_border_radius'] ) && 'undefined' !== $instance['custom_border_radius'] ) {
		$style                 = 'border-radius: ' . $instance['custom_border_radius'] . 'px; ';
		$submit_button_styles .= $style;
		$email_field_styles   .= $style;
	}
	if ( isset( $instance['custom_border_weight'] ) && 'undefined' !== $instance['custom_border_weight'] ) {
		$style                 = 'border-width: ' . $instance['custom_border_weight'] . 'px; ';
		$submit_button_styles .= $style;
		$email_field_styles   .= $style;
	}
	if ( isset( $instance['custom_border_color'] ) && 'undefined' !== $instance['custom_border_color'] ) {
		$style =
			'border-color: ' . $instance['custom_border_color'] . '; ' .
			'border-style: solid;';

		$submit_button_styles .= $style;
		$email_field_styles   .= $style;
	}

	$instance = shortcode_atts(
		Jetpack_Subscriptions_Widget::defaults(),
		$instance,
		'jetpack_subscription_form'
	);

	// These must come after the call to shortcode_atts()
	$instance['submit_button_text']         = $submit_button_text;
	$instance['show_only_email_and_button'] = $show_only_email_and_button;
	if ( ! empty( $submit_button_classes ) ) {
		$instance['submit_button_classes'] = $submit_button_classes;
	}
	if ( ! empty( $email_field_classes ) ) {
		$instance['email_field_classes'] = $email_field_classes;
	}

	if ( ! empty( $submit_button_styles ) ) {
		$instance['submit_button_styles'] = trim( $submit_button_styles );
	}
	if ( ! empty( $submit_button_wrapper_styles ) ) {
		$instance['submit_button_wrapper_styles'] = trim( $submit_button_wrapper_styles );
	}
	if ( ! empty( $email_field_styles ) ) {
		$instance['email_field_styles'] = trim( $email_field_styles );
	}

	$args = array(
		'before_widget' => '<div class="jetpack_subscription_widget">',
	);
	ob_start();
	the_widget( get_jetpack_blog_subscriptions_widget_classname(), $instance, $args );
	$output = ob_get_clean();

	return $output;
}

add_shortcode( 'jetpack_subscription_form', 'jetpack_do_subscription_form' );
add_shortcode( 'blog_subscription_form', 'jetpack_do_subscription_form' );

function jetpack_blog_subscriptions_init() {
	register_widget( get_jetpack_blog_subscriptions_widget_classname() );
}

add_action( 'widgets_init', 'jetpack_blog_subscriptions_init' );