Repeated expenses.

app/Repositories/PiggyBank/PiggyBankRepositoryInterface.php

@@ -3,6 +3,8 @@
 namespace FireflyIII\Repositories\PiggyBank;
 
 use FireflyIII\Models\PiggyBank;
+use FireflyIII\Models\PiggyBankRepetition;
+use Illuminate\Support\Collection;
 
 /**
  * Interface PiggyBankRepositoryInterface
@@ -26,4 +28,24 @@ interface PiggyBankRepositoryInterface {
      * @return PiggyBank
      */
     public function update(PiggyBank $piggyBank, array $data);
+
+    /**
+     * @SuppressWarnings("CyclomaticComplexity") // It's exactly 5. So I don't mind.
+     *
+     * Based on the piggy bank, the reminder-setting and
+     * other variables this method tries to divide the piggy bank into equal parts. Each is
+     * accommodated by a reminder (if everything goes to plan).
+     *
+     * @param PiggyBankRepetition $repetition
+     *
+     * @return Collection
+     */
+    public function calculateParts(PiggyBankRepetition $repetition);
+
+    /**
+     * @param array $data
+     *
+     * @return PiggyBankPart
+     */
+    public function createPiggyBankPart(array $data);
 }