<?php
/**
 * Optional: switch comments off across the whole site.
 *
 * Off by default. When enabled:
 * - new comments, pingbacks and trackbacks are refused everywhere (forms,
 *   wp-comments-post.php, XML-RPC and the REST API);
 * - existing comments are hidden on the front end (they stay in the database
 *   and come back when the option is switched off);
 * - the Comments menu, admin bar item, dashboard box and per-post comment
 *   boxes are removed from the dashboard.
 *
 * Nothing is deleted.
 *
 * @package SiteAuditHub
 */

namespace SiteAuditHub;

defined( 'ABSPATH' ) || exit;

/**
 * Comments switch.
 */
class Comments_Off {

	/**
	 * Register hooks when enabled.
	 */
	public static function init() {
		if ( ! (int) Settings::get( 'disable_comments' ) ) {
			return;
		}
		add_filter( 'comments_open', '__return_false', PHP_INT_MAX );
		add_filter( 'pings_open', '__return_false', PHP_INT_MAX );
		add_filter( 'comments_array', '__return_empty_array', PHP_INT_MAX );
		add_filter( 'get_comments_number', '__return_zero', PHP_INT_MAX );
		add_filter( 'feed_links_show_comments_feed', '__return_false' );
		add_filter( 'rest_endpoints', array( __CLASS__, 'rest_endpoints' ) );
		add_filter( 'xmlrpc_methods', array( __CLASS__, 'xmlrpc_methods' ) );
		add_action( 'init', array( __CLASS__, 'remove_support' ), 100 );
		add_action( 'template_redirect', array( __CLASS__, 'block_comment_feeds' ), 9 );
		add_action( 'widgets_init', array( __CLASS__, 'remove_widget' ), 20 );

		if ( is_admin() ) {
			add_action( 'admin_menu', array( __CLASS__, 'admin_menu' ), 999 );
			add_action( 'admin_init', array( __CLASS__, 'admin_redirect' ) );
			add_action( 'wp_dashboard_setup', array( __CLASS__, 'dashboard' ), 999 );
			add_filter( 'wp_count_comments', array( __CLASS__, 'zero_counts' ), PHP_INT_MAX );
			add_action( 'admin_enqueue_scripts', array( __CLASS__, 'hide_dashboard_comments' ) );
		}
		add_action( 'admin_bar_menu', array( __CLASS__, 'admin_bar' ), 999 );
	}

	/**
	 * Remove comment and trackback support from every post type.
	 */
	public static function remove_support() {
		foreach ( get_post_types() as $type ) {
			if ( post_type_supports( $type, 'comments' ) ) {
				remove_post_type_support( $type, 'comments' );
			}
			if ( post_type_supports( $type, 'trackbacks' ) ) {
				remove_post_type_support( $type, 'trackbacks' );
			}
		}
	}

	/**
	 * Hide the REST API comments endpoints from visitors who cannot moderate.
	 *
	 * @param array $endpoints Endpoints.
	 * @return array
	 */
	public static function rest_endpoints( $endpoints ) {
		if ( ! is_array( $endpoints ) || current_user_can( 'moderate_comments' ) ) {
			return $endpoints;
		}
		foreach ( array_keys( $endpoints ) as $route ) {
			if ( 0 === strpos( $route, '/wp/v2/comments' ) ) {
				unset( $endpoints[ $route ] );
			}
		}
		return $endpoints;
	}

	/**
	 * Remove XML-RPC comment and pingback methods.
	 *
	 * @param array $methods Methods.
	 * @return array
	 */
	public static function xmlrpc_methods( $methods ) {
		if ( is_array( $methods ) ) {
			foreach ( array( 'wp.newComment', 'pingback.ping', 'pingback.extensions.getPingbacks' ) as $name ) {
				unset( $methods[ $name ] );
			}
		}
		return $methods;
	}

	/**
	 * Send comment feeds to the home page.
	 */
	public static function block_comment_feeds() {
		if ( is_comment_feed() ) {
			wp_safe_redirect( home_url( '/' ), 301 );
			exit;
		}
	}

	/**
	 * Remove the "Recent Comments" widget.
	 */
	public static function remove_widget() {
		unregister_widget( 'WP_Widget_Recent_Comments' );
	}

	/**
	 * Remove the Comments and Discussion settings menus.
	 */
	public static function admin_menu() {
		remove_menu_page( 'edit-comments.php' );
		remove_submenu_page( 'options-general.php', 'options-discussion.php' );
	}

	/**
	 * Redirect the comments screens to the dashboard.
	 */
	public static function admin_redirect() {
		global $pagenow;
		if ( in_array( $pagenow, array( 'edit-comments.php', 'options-discussion.php' ), true ) ) {
			wp_safe_redirect( admin_url() );
			exit;
		}
	}

	/**
	 * Remove the "Recent Comments" dashboard box.
	 */
	public static function dashboard() {
		remove_meta_box( 'dashboard_recent_comments', 'dashboard', 'normal' );
	}

	/**
	 * Report zero comments in the dashboard ("At a Glance", menu bubbles).
	 *
	 * @return object
	 */
	public static function zero_counts() {
		return (object) array(
			'approved'       => 0,
			'moderated'      => 0,
			'spam'           => 0,
			'trash'          => 0,
			'post-trashed'   => 0,
			'total_comments' => 0,
			'all'            => 0,
		);
	}

	/**
	 * Hide the "Recent Comments" part of the dashboard "Activity" box
	 * (WordPress offers no filter for it).
	 *
	 * @param string $hook Admin page hook.
	 */
	public static function hide_dashboard_comments( $hook ) {
		if ( 'index.php' === $hook ) {
			wp_add_inline_style( 'dashboard', '#activity-widget #latest-comments{display:none!important}' );
		}
	}

	/**
	 * Remove the comments icon from the admin bar.
	 *
	 * @param \WP_Admin_Bar $bar Admin bar.
	 */
	public static function admin_bar( $bar ) {
		if ( is_object( $bar ) ) {
			$bar->remove_node( 'comments' );
		}
	}
}