Moved more code around.

app/Helpers/Report/BalanceReportHelperInterface.php

@@ -0,0 +1,32 @@
+<?php
+/**
+ * BalanceReportHelperInterface.php
+ * Copyright (C) 2016 Sander Dorigo
+ *
+ * This software may be modified and distributed under the terms
+ * of the MIT license.  See the LICENSE file for details.
+ */
+
+namespace FireflyIII\Helpers\Report;
+
+use Carbon\Carbon;
+use FireflyIII\Helpers\Collection\Balance;
+use Illuminate\Support\Collection;
+
+
+/**
+ * Interface BalanceReportHelperInterface
+ *
+ * @package FireflyIII\Helpers\Report
+ */
+interface BalanceReportHelperInterface
+{
+    /**
+     * @param Carbon     $start
+     * @param Carbon     $end
+     * @param Collection $accounts
+     *
+     * @return Balance
+     */
+    public function getBalanceReport(Carbon $start, Carbon $end, Collection $accounts);
+}