<?php

/**

 * Network API: WP_Network_Query class

 *

 * @package WordPress

 * @subpackage Multisite

 * @since 4.6.0

 */

/**

 * Core class used for querying networks.

 *

 * @since 4.6.0

 *

 * @see WP_Network_Query::__construct() for accepted arguments.

 */

class WP_Network_Query {

	/**

	 * SQL for database query.

	 *

	 * @since 4.6.0

	 * @var string

	 */

	public $request;

	/**

	 * SQL query clauses.

	 *

	 * @since 4.6.0

	 * @var array

	 */

	protected $sql_clauses = array(

		'select'  => '',

		'from'    => '',

		'where'   => array(),

		'groupby' => '',

		'orderby' => '',

		'limits'  => '',

	);

	/**

	 * Query vars set by the user.

	 *

	 * @since 4.6.0

	 * @var array

	 */

	public $query_vars;

	/**

	 * Default values for query vars.

	 *

	 * @since 4.6.0

	 * @var array

	 */

	public $query_var_defaults;

	/**

	 * List of networks located by the query.

	 *

	 * @since 4.6.0

	 * @var array

	 */

	public $networks;

	/**

	 * The amount of found networks for the current query.

	 *

	 * @since 4.6.0

	 * @var int

	 */

	public $found_networks = 0;

	/**

	 * The number of pages.

	 *

	 * @since 4.6.0

	 * @var int

	 */

	public $max_num_pages = 0;

	/**

	 * Constructor.

	 *

	 * Sets up the network query, based on the query vars passed.

	 *

	 * @since 4.6.0

	 *

	 * @param string|array $query {

	 *     Optional. Array or query string of network query parameters. Default empty.

	 *

	 *     @type array        $network__in          Array of network IDs to include. Default empty.

	 *     @type array        $network__not_in      Array of network IDs to exclude. Default empty.

	 *     @type bool         $count                Whether to return a network count (true) or array of network objects.

	 *                                              Default false.

	 *     @type string       $fields               Network fields to return. Accepts 'ids' (returns an array of network IDs)

	 *                                              or empty (returns an array of complete network objects). Default empty.

	 *     @type int          $number               Maximum number of networks to retrieve. Default empty (no limit).

	 *     @type int          $offset               Number of networks to offset the query. Used to build LIMIT clause.

	 *                                              Default 0.

	 *     @type bool         $no_found_rows        Whether to disable the `SQL_CALC_FOUND_ROWS` query. Default true.

	 *     @type string|array $orderby              Network status or array of statuses. Accepts 'id', 'domain', 'path',

	 *                                              'domain_length', 'path_length' and 'network__in'. Also accepts false,

	 *                                              an empty array, or 'none' to disable `ORDER BY` clause. Default 'id'.

	 *     @type string       $order                How to order retrieved networks. Accepts 'ASC', 'DESC'. Default 'ASC'.

	 *     @type string       $domain               Limit results to those affiliated with a given domain. Default empty.

	 *     @type array        $domain__in           Array of domains to include affiliated networks for. Default empty.

	 *     @type array        $domain__not_in       Array of domains to exclude affiliated networks for. Default empty.

	 *     @type string       $path                 Limit results to those affiliated with a given path. Default empty.

	 *     @type array        $path__in             Array of paths to include affiliated networks for. Default empty.

	 *     @type array        $path__not_in         Array of paths to exclude affiliated networks for. Default empty.

	 *     @type string       $search               Search term(s) to retrieve matching networks for. Default empty.

	 *     @type bool         $update_network_cache Whether to prime the cache for found networks. Default true.

	 * }

	 */

	public function __construct( $query = '' ) {

		$this->query_var_defaults = array(

			'network__in'          => '',

			'network__not_in'      => '',

			'count'                => false,

			'fields'               => '',

			'number'               => '',

			'offset'               => '',

			'no_found_rows'        => true,

			'orderby'              => 'id',

			'order'                => 'ASC',

			'domain'               => '',

			'domain__in'           => '',

			'domain__not_in'       => '',

			'path'                 => '',

			'path__in'             => '',

			'path__not_in'         => '',

			'search'               => '',

			'update_network_cache' => true,

		);

		if ( ! empty( $query ) ) {

			$this->query( $query );

		}

	}

	/**

	 * Parses arguments passed to the network query with default query parameters.

	 *

	 * @since 4.6.0

	 *

	 * @param string|array $query WP_Network_Query arguments. See WP_Network_Query::__construct()

	 */

	public function parse_query( $query = '' ) {

		if ( empty( $query ) ) {

			$query = $this->query_vars;

		}

		$this->query_vars = wp_parse_args( $query, $this->query_var_defaults );

		/**

		 * Fires after the network query vars have been parsed.

		 *

		 * @since 4.6.0

		 *

		 * @param WP_Network_Query $this The WP_Network_Query instance (passed by reference).

		 */

		do_action_ref_array( 'parse_network_query', array( &$this ) );

	}

	/**

	 * Sets up the WordPress query for retrieving networks.

	 *

	 * @since 4.6.0

	 *

	 * @param string|array $query Array or URL query string of parameters.

	 * @return array|int List of WP_Network objects, a list of network ids when 'fields' is set to 'ids',

	 *                   or the number of networks when 'count' is passed as a query var.

	 */

	public function query( $query ) {

		$this->query_vars = wp_parse_args( $query );

		return $this->get_networks();

	}

	/**

	 * Gets a list of networks matching the query vars.

	 *

	 * @since 4.6.0

	 *

	 * @return array|int List of WP_Network objects, a list of network ids when 'fields' is set to 'ids',

	 *                   or the number of networks when 'count' is passed as a query var.

	 */

	public function get_networks() {

		$this->parse_query();

		/**

		 * Fires before networks are retrieved.

		 *

		 * @since 4.6.0

		 *

		 * @param WP_Network_Query $this Current instance of WP_Network_Query (passed by reference).

		 */

		do_action_ref_array( 'pre_get_networks', array( &$this ) );

		$network_ids = null;

		/**

		 * Filter the sites array before the query takes place.

		 *

		 * Return a non-null value to bypass WordPress's default site queries.

		 *

		 *

		 * @since 5.2.0

		 *

		 * @param array|null       $site_ids Return an array of site data to short-circuit WP's site query,

		 *                                   or null to allow WP to run its normal queries.

		 * @param WP_Network_Query $this     The WP_Network_Query instance, passed by reference.

		 */

		$network_ids = apply_filters_ref_array( 'networks_pre_query', array( $network_ids, &$this ) );

		if ( null === $network_ids ) {

			// $args can include anything. Only use the args defined in the query_var_defaults to compute the key.

			$_args = wp_array_slice_assoc( $this->query_vars, array_keys( $this->query_var_defaults ) );

			// Ignore the $fields argument as the queried result will be the same regardless.

			unset( $_args['fields'] );

			$key          = md5( serialize( $_args ) );

			$last_changed = wp_cache_get_last_changed( 'networks' );

			$cache_key   = "get_network_ids:$key:$last_changed";

			$cache_value = wp_cache_get( $cache_key, 'networks' );

			if ( false === $cache_value ) {

				$network_ids = $this->get_network_ids();

				if ( $network_ids ) {

					$this->set_found_networks();

				}

				$cache_value = array(

					'network_ids'    => $network_ids,

					'found_networks' => $this->found_networks,

				);

				wp_cache_add( $cache_key, $cache_value, 'networks' );

			} else {

				$network_ids          = $cache_value['network_ids'];

				$this->found_networks = $cache_value['found_networks'];

			}

		}

		if ( $this->found_networks && $this->query_vars['number'] ) {

			$this->max_num_pages = ceil( $this->found_networks / $this->query_vars['number'] );

		}

		// If querying for a count only, there's nothing more to do.

		if ( $this->query_vars['count'] ) {

			// $network_ids is actually a count in this case.

			return intval( $network_ids );

		}

		$network_ids = array_map( 'intval', $network_ids );

		if ( 'ids' == $this->query_vars['fields'] ) {

			$this->networks = $network_ids;

			return $this->networks;

		}

		if ( $this->query_vars['update_network_cache'] ) {

			_prime_network_caches( $network_ids );

		}

		// Fetch full network objects from the primed cache.

		$_networks = array();

		foreach ( $network_ids as $network_id ) {

			if ( $_network = get_network( $network_id ) ) {

				$_networks[] = $_network;

			}

		}

		/**

		 * Filters the network query results.

		 *

		 * @since 4.6.0

		 *

		 * @param WP_Network[]     $_networks An array of WP_Network objects.

		 * @param WP_Network_Query $this      Current instance of WP_Network_Query (passed by reference).

		 */

		$_networks = apply_filters_ref_array( 'the_networks', array( $_networks, &$this ) );

		// Convert to WP_Network instances

		$this->networks = array_map( 'get_network', $_networks );

		return $this->networks;

	}

	/**

	 * Used internally to get a list of network IDs matching the query vars.

	 *

	 * @since 4.6.0

	 *

	 * @global wpdb $wpdb WordPress database abstraction object.

	 *

	 * @return int|array A single count of network IDs if a count query. An array of network IDs if a full query.

	 */

	protected function get_network_ids() {

		global $wpdb;

		$order = $this->parse_order( $this->query_vars['order'] );

		// Disable ORDER BY with 'none', an empty array, or boolean false.

		if ( in_array( $this->query_vars['orderby'], array( 'none', array(), false ), true ) ) {

			$orderby = '';

		} elseif ( ! empty( $this->query_vars['orderby'] ) ) {

			$ordersby = is_array( $this->query_vars['orderby'] ) ?

				$this->query_vars['orderby'] :

				preg_split( '/[,\s]/', $this->query_vars['orderby'] );

			$orderby_array = array();

			foreach ( $ordersby as $_key => $_value ) {

				if ( ! $_value ) {

					continue;

				}

				if ( is_int( $_key ) ) {

					$_orderby = $_value;

					$_order   = $order;

				} else {

					$_orderby = $_key;

					$_order   = $_value;

				}

				$parsed = $this->parse_orderby( $_orderby );

				if ( ! $parsed ) {

					continue;

				}

				if ( 'network__in' === $_orderby ) {

					$orderby_array[] = $parsed;

					continue;

				}

				$orderby_array[] = $parsed . ' ' . $this->parse_order( $_order );

			}

			$orderby = implode( ', ', $orderby_array );

		} else {

			$orderby = "$wpdb->site.id $order";

		}

		$number = absint( $this->query_vars['number'] );

		$offset = absint( $this->query_vars['offset'] );

		$limits = '';

		if ( ! empty( $number ) ) {

			if ( $offset ) {

				$limits = 'LIMIT ' . $offset . ',' . $number;

			} else {

				$limits = 'LIMIT ' . $number;

			}

		}

		if ( $this->query_vars['count'] ) {

			$fields = 'COUNT(*)';

		} else {

			$fields = "$wpdb->site.id";

		}

		// Parse network IDs for an IN clause.

		if ( ! empty( $this->query_vars['network__in'] ) ) {

			$this->sql_clauses['where']['network__in'] = "$wpdb->site.id IN ( " . implode( ',', wp_parse_id_list( $this->query_vars['network__in'] ) ) . ' )';

		}

		// Parse network IDs for a NOT IN clause.

		if ( ! empty( $this->query_vars['network__not_in'] ) ) {

			$this->sql_clauses['where']['network__not_in'] = "$wpdb->site.id NOT IN ( " . implode( ',', wp_parse_id_list( $this->query_vars['network__not_in'] ) ) . ' )';

		}

		if ( ! empty( $this->query_vars['domain'] ) ) {

			$this->sql_clauses['where']['domain'] = $wpdb->prepare( "$wpdb->site.domain = %s", $this->query_vars['domain'] );

		}

		// Parse network domain for an IN clause.

		if ( is_array( $this->query_vars['domain__in'] ) ) {

			$this->sql_clauses['where']['domain__in'] = "$wpdb->site.domain IN ( '" . implode( "', '", $wpdb->_escape( $this->query_vars['domain__in'] ) ) . "' )";

		}

		// Parse network domain for a NOT IN clause.

		if ( is_array( $this->query_vars['domain__not_in'] ) ) {

			$this->sql_clauses['where']['domain__not_in'] = "$wpdb->site.domain NOT IN ( '" . implode( "', '", $wpdb->_escape( $this->query_vars['domain__not_in'] ) ) . "' )";

		}

		if ( ! empty( $this->query_vars['path'] ) ) {

			$this->sql_clauses['where']['path'] = $wpdb->prepare( "$wpdb->site.path = %s", $this->query_vars['path'] );

		}

		// Parse network path for an IN clause.

		if ( is_array( $this->query_vars['path__in'] ) ) {

			$this->sql_clauses['where']['path__in'] = "$wpdb->site.path IN ( '" . implode( "', '", $wpdb->_escape( $this->query_vars['path__in'] ) ) . "' )";

		}

		// Parse network path for a NOT IN clause.

		if ( is_array( $this->query_vars['path__not_in'] ) ) {

			$this->sql_clauses['where']['path__not_in'] = "$wpdb->site.path NOT IN ( '" . implode( "', '", $wpdb->_escape( $this->query_vars['path__not_in'] ) ) . "' )";

		}

		// Falsey search strings are ignored.

		if ( strlen( $this->query_vars['search'] ) ) {

			$this->sql_clauses['where']['search'] = $this->get_search_sql(

				$this->query_vars['search'],

				array( "$wpdb->site.domain", "$wpdb->site.path" )

			);

		}

		$join = '';

		$where = implode( ' AND ', $this->sql_clauses['where'] );

		$groupby = '';

		$pieces = array( 'fields', 'join', 'where', 'orderby', 'limits', 'groupby' );

		/**

		 * Filters the network query clauses.

		 *

		 * @since 4.6.0

		 *

		 * @param string[]         $pieces An associative array of network query clauses.

		 * @param WP_Network_Query $this   Current instance of WP_Network_Query (passed by reference).

		 */