{
		self::$lists = array();
		return self::$lists;
	}

	/**
	 * Get visible task lists.
	 */
	public static function get_visible() {
		return array_filter(
			self::get_lists(),
			function ( $task_list ) {
				return $task_list->is_visible();
			}
		);
	}


	/**
	 * Retrieve a task list by ID.
	 *
	 * @param String $id Task list ID.
	 *
	 * @return TaskList|null
	 */
	public static function get_list( $id ) {
		if ( isset( self::$lists[ $id ] ) ) {
			return self::$lists[ $id ];
		}

		return null;
	}

	/**
	 * Retrieve single task.
	 *
	 * @param String $id Task ID.
	 * @param String $task_list_id Task list ID.
	 *
	 * @return Object
	 */
	public static function get_task( $id, $task_list_id = null ) {
		$task_list = $task_list_id ? self::get_list( $task_list_id ) : null;

		if ( $task_list_id && ! $task_list ) {
			return null;
		}

		$tasks_to_search = $task_list ? $task_list->tasks : array_reduce(
			self::get_lists(),
			function ( $all, $curr ) {
				return array_merge( $all, $curr->tasks );
			},
			array()
		);

		foreach ( $tasks_to_search as $task ) {
			if ( $id === $task->get_id() ) {
				return $task;
			}
		}

		return null;
	}

	/**
	 * Return number of setup tasks remaining
	 *
	 * @return number
	 */
	public static function setup_tasks_remaining() {
		$setup_list = self::get_list( 'setup' );

		if ( ! $setup_list || $setup_list->is_hidden() || $setup_list->has_previously_completed() || $setup_list->is_complete() ) {
			return;
		}

		$remaining_tasks = array_values(
			array_filter(
				$setup_list->get_viewable_tasks(),
				function( $task ) {
					return ! $task->is_complete();
				}
			)
		);

		return count( $remaining_tasks );
	}

	/**
	 * Add badge to homescreen menu item for remaining tasks
	 */
	public static function menu_task_count() {
		global $submenu;

		$tasks_count = self::setup_tasks_remaining();

		if ( ! $tasks_count || ! isset( $submenu['woocommerce'] ) ) {
			return;
		}

		foreach ( $submenu['woocommerce'] as $key => $menu_item ) {
			if ( 0 === strpos( $menu_item[0], _x( 'Home', 'Admin menu name', 'woocommerce' ) ) ) {
				$submenu['woocommerce'][ $key ][0] .= ' <span class="awaiting-mod update-plugins remaining-tasks-badge woocommerce-task-list-remaining-tasks-badge"><span class="count-' . esc_attr( $tasks_count ) . '">' . absint( $tasks_count ) . '</span></span>'; // phpcs:ignore WordPress.WP.GlobalVariablesOverride.Prohibited
				break;
			}
		}

	}

	/**
	 * Add visible list ids to component settings.
	 *
	 * @param array $settings Component settings.
	 *
	 * @return array
	 */
	public static function task_list_preloaded_settings( $settings ) {
		$settings['visibleTaskListIds'] = array_keys( self::get_visible() );

		return $settings;
	}
}