1 files changed, 58 insertions, 0 deletions
diff --git a/classes/Calculatable.php b/classes/Calculatable.php
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+<?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;
+		}
+	}
+}