<?php

/**

 *

 * @package WordPress

 * @subpackage Comment

 */

/**

 * Check whether a comment passes internal checks to be allowed to add.

 *

 * If manual comment moderation is set in the administration, then all checks,

 * regardless of their type and whitelist, will fail and the function will

 * return false.

 *

 * If the number of links exceeds the amount in the administration, then the

 * check fails. If any of the parameter contents match the blacklist of words,

 * then the check fails.

 *

 * If the comment author was approved before, then the comment is automatically

 * whitelisted.

 *

 * If all checks pass, the function will return true.

 *

 * @since 1.2.0

 *

 * @global wpdb $wpdb WordPress database abstraction object.

 *

 * @param string $author       Comment author name.

 * @param string $email        Comment author email.

 * @param string $url          Comment author URL.

 * @param string $comment      Content of the comment.

 * @param string $user_ip      Comment author IP address.

 * @param string $user_agent   Comment author User-Agent.

 * @param string $comment_type Comment type, either user-submitted comment,

 *		                       trackback, or pingback.

 * @return bool If all checks pass, true, otherwise false.

 */

function check_comment($author, $email, $url, $comment, $user_ip, $user_agent, $comment_type) {

	global $wpdb;

	// If manual moderation is enabled, skip all checks and return false.

	if ( 1 == get_option('comment_moderation') )

		return false;

	/** This filter is documented in wp-includes/comment-template.php */

	// Check for the number of external links if a max allowed number is set.

	if ( $max_links = get_option( 'comment_max_links' ) ) {

		$num_links = preg_match_all( '/<a [^>]*href/i', $comment, $out );

		/**

		 *

		 * @since 3.0.0

		 *

		 * @param string $url       Comment author's URL. Included in allowed links total.

		 */

		/*

		 * If the number of links in the comment exceeds the allowed amount,

		 * fail the check by returning false.

		 */

		if ( $num_links >= $max_links )

			return false;

	}

	$mod_keys = trim(get_option('moderation_keys'));

	// If moderation 'keys' (keywords) are set, process them.

	if ( !empty($mod_keys) ) {

		$words = explode("\n", $mod_keys );

		foreach ( (array) $words as $word) {

			$word = trim($word);

			// Skip empty lines.

			if ( empty($word) )

				continue;

			/*

			 * Do some escaping magic so that '#' (number of) characters in the spam

			 * words don't break things:

			 */

			$word = preg_quote($word, '#');

			/*

			 * Check the comment fields for moderation keywords. If any are found,

			 * fail the check for the given field by returning false.

			 */

			$pattern = "#$word#i";

			if ( preg_match($pattern, $author) ) return false;

			if ( preg_match($pattern, $email) ) return false;

			if ( preg_match($pattern, $url) ) return false;

			if ( preg_match($pattern, $comment) ) return false;

			if ( preg_match($pattern, $user_ip) ) return false;

			if ( preg_match($pattern, $user_agent) ) return false;

		}

	}

	/*

	 * Check if the option to approve comments by previously-approved authors is enabled.

	 *

	 * If it is enabled, check whether the comment author has a previously-approved comment,

	 * as well as whether there are any moderation keywords (if set) present in the author

	 * email address. If both checks pass, return true. Otherwise, return false.

	 */

	if ( 1 == get_option('comment_whitelist')) {

		if ( 'trackback' != $comment_type && 'pingback' != $comment_type && $author != '' && $email != '' ) {

			if ( ( 1 == $ok_to_comment ) &&

				( empty($mod_keys) || false === strpos( $email, $mod_keys) ) )

					return true;

			else

				return false;

		} else {

			return false;

		}

	}

	return true;

}

/**

 * Retrieve the approved comments for post $post_id.

 *

 * @since 2.0.0

 *

 * @param  int   $post_id The ID of the post.

 * @return int|array $comments The approved comments, or number of comments if `$count`

 *                             argument is true.

 */

function get_approved_comments( $post_id, $args = array() ) {

	if ( ! $post_id ) {

		return array();

	}

	$defaults = array(

		'status'  => 1,

		'post_id' => $post_id,

		'order'   => 'ASC',

	);

	$r = wp_parse_args( $args, $defaults );

	$query = new WP_Comment_Query;

	return $query->query( $r );

}

/**

 * Retrieves comment data given a comment ID or comment object.

 *

 * If an object is passed then the comment data will be cached and then returned

 * after being passed through a filter. If the comment is empty, then the global

 * comment variable will be used, if it is set.

 *

 * @since 2.0.0

 *

 *

 */

		$_comment = $comment;

	} else {

	}

	/**

	 * Fires after a comment is retrieved.

	 *

	 * @since 2.3.0

	 *

	 * @param mixed $_comment Comment data.

	 */

	$_comment = apply_filters( 'get_comment', $_comment );

	if ( $output == OBJECT ) {

		return $_comment;

	} elseif ( $output == ARRAY_A ) {

	} elseif ( $output == ARRAY_N ) {

	}

}

/**

 * Retrieve a list of comments.

 *

 * The comment list can be for the blog as a whole or for an individual post.

 *

 * @since 2.7.0

 *

 *                           for information on accepted arguments. Default empty.

 * @return int|array List of comments or number of found comments if `$count` argument is true.

 */

function get_comments( $args = '' ) {

	$query = new WP_Comment_Query;

	return $query->query( $args );

}

/**

 * Retrieve all of the WordPress supported comment statuses.

 *

 * Comments have a limited set of valid status values, this provides the comment

 * status values and descriptions.

 *

 * @since 2.7.0

 *

 * @return array List of comment statuses.

 */

function get_comment_statuses() {

	$status = array(

	);

	return $status;

}

/**

 * The date the last comment was modified.

 *

 * @since 1.5.0

 *

 * @global wpdb $wpdb WordPress database abstraction object.

 *

 */

	global $wpdb;

		case 'gmt':

			break;

		case 'blog':

			break;

		case 'server':

			break;

	}

}

/**

 * The amount of comments in a post or total comments.

 *

 *

 * @since 2.0.0

 *

 * @global wpdb $wpdb WordPress database abstraction object.

 *

 * @param int $post_id Optional. Comment amount in post if > 0, else total comments blog wide.

 * @return array The amount of spam, approved, awaiting moderation, and total comments.

 */

function get_comment_count( $post_id = 0 ) {

	global $wpdb;

	$post_id = (int) $post_id;

	$where = '';

	if ( $post_id > 0 ) {

		$where = $wpdb->prepare("WHERE comment_post_ID = %d", $post_id);

	}

	$totals = (array) $wpdb->get_results("

		SELECT comment_approved, COUNT( * ) AS total

		FROM {$wpdb->comments}

		{$where}

		GROUP BY comment_approved

	", ARRAY_A);

	$comment_count = array(

	);

	foreach ( $totals as $row ) {

		switch ( $row['comment_approved'] ) {

			case 'spam':

				$comment_count['spam'] = $row['total'];

				break;

				$comment_count['approved'] = $row['total'];

				$comment_count['total_comments'] += $row['total'];

				break;

				$comment_count['awaiting_moderation'] = $row['total'];

				$comment_count['total_comments'] += $row['total'];

				break;

			default:

				break;

		}

	}

	return $comment_count;

}

//

// Comment meta functions

//

/**

 * Add meta data field to a comment.

 *

 * @since 2.9.0

 * @link https://codex.wordpress.org/Function_Reference/add_comment_meta

 *

 * @param int $comment_id Comment ID.

 * @param string $meta_key Metadata name.

 * @param mixed $meta_value Metadata value.

 * @param bool $unique Optional, default is false. Whether the same key should not be added.

 * @return int|bool Meta ID on success, false on failure.

 */

function add_comment_meta($comment_id, $meta_key, $meta_value, $unique = false) {

}

/**

 * Remove metadata matching criteria from a comment.

 *

 * You can match based on the key, or key and value. Removing based on key and

 * value, will keep from removing duplicate metadata with the same key. It also

 * allows removing all metadata matching key, if needed.

 *

 * @since 2.9.0

 * @link https://codex.wordpress.org/Function_Reference/delete_comment_meta

 *

 * @param int $comment_id comment ID

 * @param string $meta_key Metadata name.

 * @param mixed $meta_value Optional. Metadata value.

 * @return bool True on success, false on failure.

 */

function delete_comment_meta($comment_id, $meta_key, $meta_value = '') {

}

/**

 * Retrieve comment meta field for a comment.

 *

 * @since 2.9.0

 * @link https://codex.wordpress.org/Function_Reference/get_comment_meta

 *

 * @param int $comment_id Comment ID.

 * @param string $key Optional. The meta key to retrieve. By default, returns data for all keys.

 * @param bool $single Whether to return a single value.

 * @return mixed Will be an array if $single is false. Will be value of meta data field if $single

 *  is true.

 */

function get_comment_meta($comment_id, $key = '', $single = false) {

	return get_metadata('comment', $comment_id, $key, $single);

}

/**

 * Update comment meta field based on comment ID.

 *

 * Use the $prev_value parameter to differentiate between meta fields with the

 * same key and comment ID.

 *

 * If the meta field for the comment does not exist, it will be added.

 *

 * @since 2.9.0

 * @link https://codex.wordpress.org/Function_Reference/update_comment_meta

 *

 * @param int $comment_id Comment ID.

 * @param string $meta_key Metadata key.

 * @param mixed $meta_value Metadata value.

 * @param mixed $prev_value Optional. Previous value to check before removing.

 * @return int|bool Meta ID if the key didn't exist, true on successful update, false on failure.

 */

function update_comment_meta($comment_id, $meta_key, $meta_value, $prev_value = '') {