<?php
/**
 * Activation: the tables, the reason list and the schema version.
 *
 * @package Careback
 */

namespace Careback;

defined( 'ABSPATH' ) || exit;

/**
 * Sets a site up when the plugin is activated, or the first sites of a
 * network when it is activated for the whole network.
 */
class Activator {

	/**
	 * Sites a network activation sets up in its own request, the current one
	 * first. Each of the others is set up on its next admin or cron load
	 * (Plugin::maybe_upgrade(): it has no schema version yet), so a large
	 * network is not set up in one request.
	 */
	const NETWORK_SITES = 20;

	/**
	 * Priority of initialize_site() on `wp_initialize_site`: after WordPress has
	 * made the new site's tables and options (10), before an add-on that sets
	 * up its part on the same hook after this one.
	 */
	const SITE_PRIORITY = 20;

	/**
	 * Activation: the tables, the reason list and the schema version of this
	 * site — or, activated for a whole network, of the first NETWORK_SITES
	 * sites of it.
	 *
	 * @param bool $network_wide Whether the plugin is activated for the whole network.
	 * @return void
	 */
	public static function activate( $network_wide = false ) {
		if ( ! $network_wide || ! is_multisite() ) {
			self::set_up_site();

			return;
		}

		foreach ( self::network_sites() as $site_id ) {
			switch_to_blog( $site_id );
			self::set_up_site();
			restore_current_blog();
		}
	}

	/**
	 * A site added to a network where the plugin is active for every site
	 * (`wp_initialize_site`, WordPress 5.1+): set up as it is created, so its
	 * returns form works from its first page. One whose setup fails here waits
	 * like any site without tables (Database::ready()) and is set up on its
	 * next admin or cron load.
	 *
	 * @param \WP_Site $site The new site.
	 * @return void
	 */
	public static function initialize_site( $site ) {
		if ( ! $site instanceof \WP_Site || ! is_multisite() ) {
			return;
		}

		if ( ! function_exists( 'is_plugin_active_for_network' ) ) {
			require_once ABSPATH . 'wp-admin/includes/plugin.php';
		}

		if ( ! is_plugin_active_for_network( plugin_basename( CAREBACK_FILE ) ) ) {
			return;
		}

		switch_to_blog( (int) $site->blog_id );
		self::set_up_site();
		restore_current_blog();
	}

	/**
	 * Sets the current site up: the tables, the reason list, the schema version.
	 *
	 * @return void
	 */
	private static function set_up_site() {
		$fresh = false === get_option( 'careback_db_version' );

		Database::create_tables();
		Reasons::install( new Settings() );

		if ( $fresh ) {
			self::seed_new_site();
		}

		update_option( 'careback_db_version', CAREBACK_DB_VERSION );
	}

	/**
	 * The choices a new install starts with where an update keeps the shop's
	 * own (design of step 6): the details of each item under its name (N-16),
	 * and WooCommerce's returns policy page when it is published (N-13). A key
	 * the site already stores is left as it is.
	 *
	 * @return void
	 */
	public static function seed_new_site() {
		$stored = get_option( CAREBACK_OPTION, array() );
		$stored = is_array( $stored ) ? $stored : array();
		$seed   = array(
			'variation_display'   => 1,
			'returns_policy_page' => Returns_Policy::new_install_page(),
		);

		$missing = array_diff_key( $seed, $stored );

		if ( $missing ) {
			update_option( CAREBACK_OPTION, array_merge( $stored, $missing ) );
		}
	}

	/**
	 * The sites a network activation sets up: the current one, then the
	 * network's others in the order they were created, NETWORK_SITES in all.
	 * Sites that serve no pages (archived, deleted, spam) are left out.
	 *
	 * @return int[]
	 */
	private static function network_sites() {
		$others = get_sites(
			array(
				'fields'     => 'ids',
				'network_id' => get_current_network_id(),
				'number'     => self::NETWORK_SITES,
				'orderby'    => 'id',
				'order'      => 'ASC',
				'archived'   => 0,
				'deleted'    => 0,
				'spam'       => 0,
			)
		);

		$sites = array_unique( array_map( 'intval', array_merge( array( get_current_blog_id() ), (array) $others ) ) );

		return array_slice( array_values( $sites ), 0, self::NETWORK_SITES );
	}
}