<?php
/**
 * Provides the calculatable trait, to be used by something of which
 * subtotal, VAT and total can be calculated.
 *
 * @author Camil Staps
 *
 * BusinessAdmin: administrative software for small companies
 * Copyright (C) 2015 Camil Staps (ViviSoft)
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

/**
 * The calculatable trait, to be used by something of which subtotal, VAT and
 * total can be calculated
 */
trait Calculatable {
	abstract public function calculateSubtotal();
	abstract public function calculateVAT();

	public function calculateTotal() {
		return $this->calculateSubtotal() + $this->calculateVAT();
	}

	public function calculate($what = self::TOTAL, $round = 2, $format = true) {
		$return = 0;
		switch ($what) {
			case self::SUBTOTAL:
				$return = $this->calculateSubtotal();
				break;
			case self::VAT:
				$return = $this->calculateVAT();
				break;
			case self::TOTAL:
				$return = $this->calculateTotal();
				break;
			default:
				return false;
		}
		if ($format) {
			return number_format($return, $round);
		} else {
			return $return;
		}
	}
}