Add discount support to invoice generation

src/Service/InvoiceCreator.php

@@ -4,6 +4,7 @@ namespace App\Service;
 
 use App\Ramcar\InvoiceCriteria;
 use App\Ramcar\TradeInType;
+use App\Ramcar\DiscountApply;
 
 use App\Entity\Invoice;
 use App\Entity\InvoiceItem;
@@ -126,6 +127,28 @@ class InvoiceCreator
 
     protected function processDiscount(&$total, InvoiceCriteria $criteria, Invoice $invoice)
     {
+        $promos = $criteria->getPromos();
+        if (count($promos) < 1)
+            return;
+
+        // NOTE: only get first promo because only one is applicable anyway
+        $promo = $promos[0];
+
+        $rate = $promo->getDiscountRate();
+        $apply_to = $promo->getDiscountApply();
+
+        switch ($apply_to)
+        {
+            case DiscountApply::SRP:
+                $discount = round($total['sell_price'] * $rate, 2);
+                break;
+            case DiscountApply::OPL:
+                $discount = round($total['sell_price'] * 0.6 / 0.7 * $rate, 2);
+                break;
+        }
+
+        $total['discount'] = $discount;
+        $total['total_price'] -= $discount;
     }
 
     public function processCriteria(InvoiceCriteria $criteria)
@@ -138,6 +161,7 @@ class InvoiceCreator
             'vat_ex_price' => 0.0,
             'ti_rate' => 0.0,
             'total_price' => 0.0,
+            'discount' => 0.0,
         ];
 
         $this->processBatteries($total, $criteria, $invoice);
@@ -151,6 +175,7 @@ class InvoiceCreator
         $invoice->setTotalPrice($total['total_price'])
             ->setVATExclusivePrice($total['vat_ex_price'])
             ->setVAT($total['vat'])
+            ->setDiscount($total['discount'])
             ->setTradeIn($total['ti_rate']);