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Filename : trackbacks.php
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<?php

if (!defined('WPO_VERSION')) die('No direct access allowed');

class WP_Optimization_trackbacks extends WP_Optimization {

	public $ui_sort_order = 7000;

	public $available_for_saving = true;

	/**
	 * Prepare data for preview widget.
	 *
	 * @param array $params
	 *
	 * @return array
	 */
	public function preview($params) {

		// get data requested for preview.
		// `$this->wpdb->prepare` is global `$wpdb->prepare`
		// phpcs:disable
		$sql = $this->wpdb->prepare(
			"SELECT comment_ID, comment_author, SUBSTR(comment_content, 1, 128) AS comment_content".
			" FROM `" . $this->wpdb->comments . "`".
			" WHERE comment_type = 'trackback'".
			" ORDER BY `comment_ID` LIMIT %d, %d;",
			array(
				$params['offset'],
				$params['limit'],
			)
		);

		$posts = $this->wpdb->get_results($sql, ARRAY_A);
		// phpcs:enable

		// fix empty revision titles.
		if (!empty($posts)) {
			foreach ($posts as $key => $post) {
				$posts[$key]['post_title'] = array(
					'text' => '' === $post['post_title'] ? '('.__('no title', 'wp-optimize').')' : $post['post_title'],
					'url' => get_edit_post_link($post['ID']),
				);
			}
		}

		// get total count comments for optimization.
		$sql = "SELECT COUNT(*) FROM `" . $this->wpdb->comments . "` WHERE comment_type = 'trackback';";

		$total = $this->wpdb->get_var($sql); // phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared -- Safe, no user input used

		return array(
			'id_key' => 'comment_ID',
			'columns' => array(
				'comment_ID' => __('ID', 'wp-optimize'),
				'comment_author' => __('Author', 'wp-optimize'),
				'comment_content' => __('Comment', 'wp-optimize'),
			),
			'offset' => $params['offset'],
			'limit' => $params['limit'],
			'total' => $total,
			'data' => $this->htmlentities_array($posts, array('comment_ID')),
			'message' => $total > 0 ? '' : __('No trackbacks found', 'wp-optimize'),
		);
	}

	/**
	 * Do actions after optimize() function.
	 */
	public function after_optimize() {
		// translators: %s is the number of deleted trackbacks
		$message = sprintf(_n('%s trackback deleted', '%s trackbacks deleted', $this->processed_count, 'wp-optimize'), number_format_i18n($this->processed_count));

		if ($this->is_multisite_mode()) {
			// translators: %s is the number of sites
			$message .= ' '. sprintf(_n('across %s site', 'across %s sites', count($this->blogs_ids), 'wp-optimize'), count($this->blogs_ids));
		}

		// add preview link for output.
		if ($this->found_count > 0) {
			$message = $this->get_preview_link($message);
		}

		$this->logger->info($message);
		$this->register_output($message);
	}

	/**
	 * Do optimization.
	 */
	public function optimize() {
		$clean = "DELETE c, cm FROM `" . $this->wpdb->comments . "` c LEFT JOIN `" . $this->wpdb->commentmeta . "` cm ON c.comment_ID = cm.comment_id WHERE comment_type = 'trackback'";

		// if posted ids in params, then remove only selected items. used by preview widget.
		if (isset($this->data['ids'])) {
			$clean .= ' AND comment_ID in ('.join(',', $this->data['ids']).')';
		}

		$clean .= ";";

		$comments = $this->query($clean);
		$this->processed_count += $comments;

		// update comment count
		$update = "UPDATE `" . $this->wpdb->posts . "` as p
		INNER JOIN (SELECT comment_post_ID as cid, COUNT(comment_post_ID) as cc 
		FROM `" . $this->wpdb->comments . "` GROUP BY comment_post_ID) AS c ON p.ID = c.cid
		SET p.comment_count = c.cc
		WHERE p.ID = c.cid";
		$this->query($update);
	}

	/**
	 * Do actions after get_info() function.
	 */
	public function after_get_info() {
		if ($this->found_count) {
			// translators: %s is the number of found trackbacks
			$message = sprintf(_n('%s Trackback found', '%s Trackbacks found', $this->found_count, 'wp-optimize'), number_format_i18n($this->found_count));
		} else {
			$message = __('No trackbacks found', 'wp-optimize');
		}

		if ($this->is_multisite_mode()) {
			// translators: %s is the number of sites
			$message .= ' ' . sprintf(_n('across %s site', 'across %s sites', count($this->blogs_ids), 'wp-optimize'), count($this->blogs_ids));
		}

		$this->register_output($message);
	}

	public function get_info() {
		$sql = "SELECT COUNT(*) FROM `" . $this->wpdb->comments . "` WHERE comment_type='trackback';";

		$comments = $this->wpdb->get_var($sql); // phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared -- Safe, no user input used
		$this->found_count += $comments;
	}
	
	/**
	 * Do actions after get_info() function.
	 *
	 * @return string
	 */
	public function settings_label() {
		return __('Remove trackbacks', 'wp-optimize');
	}
}