<?php

/**

 * Network API

 *

 * @package WordPress

 * @subpackage Multisite

 * @since 5.1.0

 */

/**

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

 *

 * Network data will be cached and returned after being passed through a filter.

 * If the provided network is empty, the current network global will be used.

 *

 * @since 4.6.0

 *

 * @global WP_Network $current_site

 *

 * @param WP_Network|int|null $network Optional. Network to retrieve. Default is the current network.

 * @return WP_Network|null The network object or null if not found.

 */

function get_network( $network = null ) {

	global $current_site;

	if ( empty( $network ) && isset( $current_site ) ) {

		$network = $current_site;

	}

	if ( $network instanceof WP_Network ) {

		$_network = $network;

	} elseif ( is_object( $network ) ) {

		$_network = new WP_Network( $network );

	} else {

		$_network = WP_Network::get_instance( $network );

	}

	if ( ! $_network ) {

		return null;

	}

	/**

	 * Fires after a network is retrieved.

	 *

	 * @since 4.6.0

	 *

	 * @param WP_Network $_network Network data.

	 */

	$_network = apply_filters( 'get_network', $_network );

	return $_network;

}

/**

 * Retrieves a list of networks.

 *

 * @since 4.6.0

 *

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

 *                           for information on accepted arguments. Default empty array.

 * @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.

 */

function get_networks( $args = array() ) {

	$query = new WP_Network_Query();

	return $query->query( $args );

}

/**

 * Removes a network from the object cache.

 *

 * @since 4.6.0

 *

 * @global bool $_wp_suspend_cache_invalidation

 *

 * @param int|array $ids Network ID or an array of network IDs to remove from cache.

 */

function clean_network_cache( $ids ) {

	global $_wp_suspend_cache_invalidation;

	if ( ! empty( $_wp_suspend_cache_invalidation ) ) {

		return;

	}

		/**

		 * Fires immediately after a network has been removed from the object cache.

		 *

		 * @since 4.6.0

		 *

		 * @param int $id Network ID.

		 */

		do_action( 'clean_network_cache', $id );

	}

	wp_cache_set( 'last_changed', microtime(), 'networks' );

}

/**

 * Updates the network cache of given networks.

 *

 * Will add the networks in $networks to the cache. If network ID already exists

 * in the network cache then it will not be updated. The network is added to the

 * cache using the network group with the key using the ID of the networks.

 *

 * @since 4.6.0

 *

 * @param array $networks Array of network row objects.

 */

function update_network_cache( $networks ) {

	foreach ( (array) $networks as $network ) {

	}

}

/**

 * Adds any networks from the given IDs to the cache that do not already exist in cache.

 *

 * @since 4.6.0

 * @access private

 *

 * @see update_network_cache()

 * @global wpdb $wpdb WordPress database abstraction object.

 *

 * @param array $network_ids Array of network IDs.

 */

function _prime_network_caches( $network_ids ) {

	global $wpdb;

	$non_cached_ids = _get_non_cached_ids( $network_ids, 'networks' );

	if ( ! empty( $non_cached_ids ) ) {

		$fresh_networks = $wpdb->get_results( sprintf( "SELECT $wpdb->site.* FROM $wpdb->site WHERE id IN (%s)", implode( ',', array_map( 'intval', $non_cached_ids ) ) ) ); // phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared

		update_network_cache( $fresh_networks );

	}

}