added short invoice calculator and timesheet invoice template #104 (#105)

src/Invoice/CalculatorInterface.php

@@ -11,6 +11,7 @@
 
 namespace App\Invoice;
 
+use App\Entity\Timesheet;
 use App\Model\InvoiceModel;
 
 /**
@@ -22,26 +23,43 @@ interface CalculatorInterface
 {
 
     /**
+     * Return the timesheet records that will be displayed on the invoice.
+     *
+     * @return Timesheet[]
+     */
+    public function getEntries();
+
+    /**
+     * Set the invoice model and can be used to fetch the customer.
+     *
      * @param InvoiceModel $model
      */
     public function setModel(InvoiceModel $model);
 
     /**
+     * Returns the subtotal before taxes.
+     *
      * @return float
      */
     public function getSubtotal(): float;
 
     /**
+     * Returns the tax amount for this invoice.
+     *
      * @return float
      */
     public function getTax(): float;
 
     /**
+     * Returns the total amount for this invoice including taxes.
+     *
      * @return float
      */
     public function getTotal(): float;
 
     /**
+     * Returns the currency for the invoices amounts.
+     *
      * @return string
      */
     public function getCurrency(): string;