From 428fde3fd25bfdbc5ef619abb1c7396cb08f99ab Mon Sep 17 00:00:00 2001
From: Elisabeth Berg <elisab3@stud.ntnu.no>
Date: Sun, 24 May 2026 19:57:55 +0200
Subject: [PATCH] Update Purchase class with exceptions

---
 src/main/java/Model/Purchase.java | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/src/main/java/Model/Purchase.java b/src/main/java/Model/Purchase.java
index d0b14fe..33c41e5 100644
--- a/src/main/java/Model/Purchase.java
+++ b/src/main/java/Model/Purchase.java
@@ -8,10 +8,19 @@ public Purchase(Share share, int week) {
 
     @Override
     public void commit(Player player) {
+        if (player == null) {
+            throw new IllegalArgumentException("Player cannot be null");
+        }
+        if (isCommitted()) {
+            throw new IllegalStateException("Purchase has already been committed");
+        }
+
         BigDecimal price = this.getCalculator().calculateTotal();
 
-        if (isCommitted() || (player.getMoney().compareTo(price) < 0)) {
-            return;
+        if (player.getMoney().compareTo(price) < 0) {
+            throw new IllegalStateException(
+                "Insufficient funds: required " + price + ", available " + player.getMoney()
+            );
         }
 
         player.withdrawMoney(price);