Updates to invoice display

modules/payment/classes/model/payment.php

@@ -21,7 +21,9 @@ class Model_Payment extends ORMOSB {
 		'checkout'=>array('foreign_key'=>'checkout_plugin_id'),
 	);
 
-	protected $_sorting = array('date_payment'=>'DESC');
+	protected $_sorting = array(
+		'date_payment'=>'DESC'
+	);
 
 	protected $_display_filters = array(
 		'date_payment'=>array(
@@ -42,4 +44,32 @@ class Model_Payment extends ORMOSB {
 			->where('date_payment','>=',time()-$start*86400)
 			->find_all();
 	}
+
+	/**
+	 * Calculate the remaining balance available for this payment
+	 */
+	public function balance($format=FALSE) {
+		$t = 0;
+
+		foreach ($this->payment_item->find_all() as $pio)
+			$t += $pio->alloc_amt;
+
+		return $format ? Currency::display($this->total_amt-$t) : $this->total_amt-$t;
+	}
+
+	/**
+	 * Return a list of invoices that this payment is applied to
+	 */
+	public function invoices() {
+		$invoices = array();
+
+		foreach ($this->payment_item->find_all() as $pio)
+			array_push($invoices,$pio->invoice);
+
+		return $invoices;
+	}
+
+	public function invoicelist() {
+		return join(',',$this->invoices());
+	}
 }