<?php

namespace DeliciousBrains\WPMDB\SiteMigration\Plugin;

class Scrubber {
	/**
	 * The amount of time to wait to delete migration data
	 */
	const DELETION_DELAY = DAY_IN_SECONDS * 7;

	/**
	 * The identifier used for the cron to delete migration data
	 */
	const DELAYED_DELETION_CRON_IDENTIFIER = WPMDB_OPTION_PREFIX . 'delayed_delete_migration';

	/**
	 * @var string[] Options constants containing migration specific info
	 **/
	protected $migration_options = [
		WPMDB_MIGRATION_OPTIONS_OPTION,
		WPMDB_MIGRATION_STATE_OPTION,
		WPMDB_MIGRATION_STATS_OPTION,
	];

	/**
	 * Register hooks
	 **/
	public function register() {
		add_action( 'wpmdb_migration_dismissed', [ $this, 'migration_dismissed' ] );
		add_action( 'wpmdb_deactivate_plugin', [ $this, 'deactivate_plugin' ] );
		add_action( 'wpmdb_migration_started', [ $this, 'migration_started' ] );
		add_action( self::DELAYED_DELETION_CRON_IDENTIFIER, [ $this, 'delayed_deletion' ] );
	}

	/**
	 * When migration is dismissed
	 *
	 * @handles wpmdb_migration_dismissed
	 * @return void
	 **/
	public function migration_dismissed() {
		$this->delete_migration_options();
	}

	/**
	 * Runs when plugin is deactivated
	 *
	 * Hooked to plugin deactivation hook
	 *
	 * @return void
	 **/
	public function deactivate_plugin() {
		$this->delete_migration_options();
	}

	/**
	 * Deletes migration options
	 *
	 * @return void
	 **/
	protected function delete_migration_options() {
		foreach ( $this->migration_options as $option ) {
			delete_site_option( $option );
		}
		$this->remove_delayed_deletion();
	}

	/**
	 * Deletes plugin options
	 *
	 * Called from the plugin deletion hook
	 * Uses wildcard to remove transients and options related to the plugin
	 *
	 * @return mixed int|bool
	 **/
	public static function delete_all_plugin_options() {
		global $wpdb;

		$like = '%' . $wpdb->esc_like( 'wpesm_' ) . '%';

		if ( is_multisite() ) {
			$sql = $wpdb->prepare(
				"DELETE FROM $wpdb->sitemeta WHERE meta_key LIKE %s",
				$like
			);
		} else {
			$sql = $wpdb->prepare(
				"DELETE FROM $wpdb->options WHERE option_name LIKE %s",
				$like
			);
		}

		return $wpdb->query( $sql );
	}

	/**
	 * Handles cron when migration starts
	 *
	 * @param string $migration_id
	 *
	 * @handles wpmdb_migration_started
	 * @return void
	 **/
	public function migration_started( $migration_id ) {
		//remove any previous cron
		$this->remove_delayed_deletion();
		//setup new cron
		$this->create_delayed_deletion();
	}

	/**
	 * Called by the cron
	 *
	 * @handles wpesm_delayed_delete_migration
	 * @return void
	 **/
	public function delayed_deletion() {
		$this->delete_migration_options();
	}

	/**
	 * Creates cron event to delete migration options
	 *
	 * Cron is set to run 72 hours after migration begins
	 *
	 * @return void
	 **/
	public function create_delayed_deletion() {
		wp_schedule_single_event(
			time() + self::DELETION_DELAY,
			self::DELAYED_DELETION_CRON_IDENTIFIER
		);
	}

	/**
	 * Removes cron
	 **/
	public function remove_delayed_deletion() {
		wp_clear_scheduled_hook( self::DELAYED_DELETION_CRON_IDENTIFIER );
	}
}