Merge pull request #4 from OpenBuildings/promotion-giftcard-fixes

Fixed giftcard promotion to work only on the brand purchases it applies to

classes/Kohana/Model/Promotion/Promocode/Giftcard.php

@@ -36,10 +36,25 @@ public function validate_purchase(Model_Purchase $purchase)
 
 	public function price_for_purchase_item(Model_Purchase_Item $purchase_item)
 	{
-		$brand_purchases_count = $purchase_item->brand_purchase->purchase->brand_purchases->count();
+		$brand_purchase = $purchase_item->get_insist('brand_purchase');
+		$brand_total = $brand_purchase->total_price('product');
+
+		$purchase = $brand_purchase->get_insist('purchase');
+
+		$totals = array_map(function ($brand_purchase) {
+			return $this->applies_to($brand_purchase)
+				? $brand_purchase->total_price('product')
+				: 0;
+		}, $purchase->brand_purchases->as_array());
+
+		$total = Jam_Price::sum($totals, $purchase_item->currency(), $purchase_item->monetary());
+
+		$multiplier = $total->is(Jam_Price::GREATER_THAN, 0)
+			? $brand_total->amount() / $total->amount()
+			: 1;
 
 		return $this->amount
 			->monetary($purchase_item->monetary())
-			->multiply_by(-1 / $brand_purchases_count);
+			->multiply_by(-$multiplier);
 	}
 }

tests/tests/Model/Promotion/Promocode/GitfcardTest.php

@@ -69,12 +69,14 @@ public function test_price_for_purchase_item()
 		));
 
 		$purchase_item
-			->expects($this->once())
+			->expects($this->any())
 			->method('monetary')
 			->will($this->returnValue($monetary));
 
+
 		$purchase_item->set(array(
 			'brand_purchase' => array(
+				'id' => 1,
 				'purchase' => array(
 					'brand_purchases' => array(
 						array('id' => 1),
@@ -84,12 +86,23 @@ public function test_price_for_purchase_item()
 			)
 		));
 
-		$promotion = Jam::build('promotion_promocode_giftcard', array(
-			'amount' => 20,
+		$promotion = $this->getMock('Model_Promotion_Promocode_Giftcard', array(
+			'applies_to'
+		), array(
+			'promotion'
+		));
+
+		$promotion
+			->expects($this->exactly(2))
+			->method('applies_to')
+			->will($this->onConsecutiveCalls(TRUE, FALSE));
+
+		$promotion->set(array(
+			'amount' => new Jam_Price(20, 'GBP', $monetary, 'GBP'),
 			'currency' => 'GBP',
 		));
 
-		$expected_price = new Jam_Price(-10, 'GBP', $monetary, 'GBP');
+		$expected_price = new Jam_Price(-20, 'GBP', $monetary, 'GBP');
 
 		$this->assertEquals($expected_price, $promotion->price_for_purchase_item($purchase_item));
 	}