<?php

/**

 * Core Comment API

 *

 * @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,

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

 */

	global $wpdb;

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

		return false;

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

	$comment = apply_filters( 'comment_text', $comment, null, array() );

	// 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 );

		/**

		 * Filters the number of links found in a comment.

		 *

		 * @since 3.0.0

		 * @since 4.7.0 Added the `$comment` parameter.

		 *

		 * @param int    $num_links The number of links found.

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

		 * @param string $comment   Content of the comment.

		 */

		$num_links = apply_filters( 'comment_max_links_url', $num_links, $url, $comment );

		/*

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

		 * fail the check by returning false.

		 */

			return false;

	}

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

			// Skip empty lines.

				continue;

			/*

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

			 * words don't break things:

			 */

			/*

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

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

			 */

			$pattern = "#$word#i";

		}

	}

	/*

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

			$comment_user = get_user_by( 'email', wp_unslash( $email ) );

			if ( ! empty( $comment_user->ID ) ) {

				$ok_to_comment = $wpdb->get_var( $wpdb->prepare( "SELECT comment_approved FROM $wpdb->comments WHERE user_id = %d AND comment_approved = '1' LIMIT 1", $comment_user->ID ) );

			} else {

				// expected_slashed ($author, $email)

				$ok_to_comment = $wpdb->get_var( $wpdb->prepare( "SELECT comment_approved FROM $wpdb->comments WHERE comment_author = %s AND comment_author_email = %s and comment_approved = '1' LIMIT 1", $author, $email ) );

			}

			if ( ( 1 == $ok_to_comment ) &&

					return true;

				return false;

		} else {

			return false;

		}

	}

	return true;

}

/**

 * Retrieve the approved comments for post $post_id.

 *

 * @since 2.0.0

 * @since 4.1.0 Refactored to leverage WP_Comment_Query over a direct query.

 *

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

 * @param  array $args    Optional. See WP_Comment_Query::__construct() for information on accepted arguments.

 * @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',

	);

	$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

 *

 * @global WP_Comment $comment

 *

 * @param WP_Comment|string|int $comment Comment to retrieve.

 * @param string                $output  Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which correspond to

 *                                       a WP_Comment object, an associative array, or a numeric array, respectively. Default OBJECT.

 * @return WP_Comment|array|null Depends on $output value.

 */

function get_comment( &$comment = null, $output = OBJECT ) {

	if ( empty( $comment ) && isset( $GLOBALS['comment'] ) ) {

		$comment = $GLOBALS['comment'];

	}

	if ( $comment instanceof WP_Comment ) {

		$_comment = $comment;

	} elseif ( is_object( $comment ) ) {

		$_comment = new WP_Comment( $comment );

	} else {

		$_comment = WP_Comment::get_instance( $comment );

	}

	if ( ! $_comment ) {

		return null;

	}

	/**

	 * 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 ) {

		return $_comment->to_array();

	} elseif ( $output == ARRAY_N ) {

		return array_values( $_comment->to_array() );

	}

	return $_comment;

}

/**

 * 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

 *

 * @param string|array $args Optional. Array or string of arguments. See WP_Comment_Query::__construct()

 *                           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;

}

/**

 * Gets the default comment status for a post type.

 *

 * @since 4.3.0

 *

 * @param string $post_type    Optional. Post type. Default 'post'.

 * @param string $comment_type Optional. Comment type. Default 'comment'.

 * @return string Expected return value is 'open' or 'closed'.

 */

function get_default_comment_status( $post_type = 'post', $comment_type = 'comment' ) {

	switch ( $comment_type ) {

			$supports = 'trackbacks';

			break;

			$supports = 'comments';

	}

	// Set the status.

	if ( 'page' === $post_type ) {

		$status = 'closed';

	} elseif ( post_type_supports( $post_type, $supports ) ) {

		$status = get_option( "default_{$option}_status" );

	} else {

		$status = 'closed';

	}

	/**

	 * Filters the default comment status for the given post type.

	 *

	 * @since 4.3.0

	 *

	 * @param string $status       Default status for the given post type,

	 *                             either 'open' or 'closed'.

	 * @param string $post_type    Post type. Default is `post`.

	 * @param string $comment_type Type of comment. Default is `comment`.

	 */

}

/**

 * The date the last comment was modified.

 *

 * @since 1.5.0

 * @since 4.7.0 Replaced caching the modified date in a local static variable

 *              with the Object Cache API.

 *

 * @global wpdb $wpdb WordPress database abstraction object.

 *

 * @param string $timezone Which timezone to use in reference to 'gmt', 'blog', or 'server' locations.

 * @return string|false Last comment modified date on success, false on failure.

 */

function get_lastcommentmodified( $timezone = 'server' ) {

	global $wpdb;

	$timezone = strtolower( $timezone );

	$comment_modified_date = wp_cache_get( $key, 'timeinfo' );

	if ( false !== $comment_modified_date ) {

		return $comment_modified_date;

	}

	switch ( $timezone ) {

		case 'gmt':

			$comment_modified_date = $wpdb->get_var( "SELECT comment_date_gmt FROM $wpdb->comments WHERE comment_approved = '1' ORDER BY comment_date_gmt DESC LIMIT 1" );

			break;

		case 'blog':

			$comment_modified_date = $wpdb->get_var( "SELECT comment_date FROM $wpdb->comments WHERE comment_approved = '1' ORDER BY comment_date_gmt DESC LIMIT 1" );

			break;

		case 'server':

			$add_seconds_server = date( 'Z' );

			$comment_modified_date = $wpdb->get_var( $wpdb->prepare( "SELECT DATE_ADD(comment_date_gmt, INTERVAL %s SECOND) FROM $wpdb->comments WHERE comment_approved = '1' ORDER BY comment_date_gmt DESC LIMIT 1", $add_seconds_server ) );

			break;

	}

	if ( $comment_modified_date ) {

		wp_cache_set( $key, $comment_modified_date, 'timeinfo' );

		return $comment_modified_date;

	}

	return false;

}

/**

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

 *

 * A lot like wp_count_comments(), in that they both return comment stats (albeit with different types).

 * The wp_count_comments() actually caches, but this function does not.

 *

 * @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 ) {

	}

		SELECT comment_approved, COUNT( * ) AS total

		FROM {$wpdb->comments}

		{$where}

		GROUP BY comment_approved

	$comment_count = array(

		'approved'            => 0,

		'awaiting_moderation' => 0,

		'spam'                => 0,

		'trash'               => 0,

		'post-trashed'        => 0,

		'total_comments'      => 0,

		'all'                 => 0,

	);

	foreach ( $totals as $row ) {

		switch ( $row['comment_approved'] ) {

			case 'trash':

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

				break;

			case 'post-trashed':

				$comment_count['post-trashed'] = $row['total'];

				break;

			case 'spam':

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

				break;

			case '1':

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

				break;

			case '0':

				$comment_count['awaiting_moderation'] = $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.

 */

}

/**

 * 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.

 */

}

/**

 * 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.

 */

}

/**

 * 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.