Show if expense are paid

lib/constants.dart

@@ -529,11 +529,15 @@ const kPaymentStatuses = {
 const String kExpenseStatusLogged = '1';
 const String kExpenseStatusPending = '2';
 const String kExpenseStatusInvoiced = '3';
+const String kExpenseStatusUnpaid = '4';
+const String kExpenseStatusPaid = '5';
 
 const kExpenseStatuses = {
   kExpenseStatusLogged: 'logged',
   kExpenseStatusPending: 'pending',
   kExpenseStatusInvoiced: 'invoiced',
+  kExpenseStatusUnpaid: 'unpaid',
+  kExpenseStatusPaid: 'paid',
 };
 
 const String kDefaultCurrencyId = '1';

lib/data/models/expense_model.dart

@@ -609,6 +609,10 @@ abstract class ExpenseEntity extends Object
           !isInvoiced &&
           !isPending) {
         return true;
+      } else if (status.id == kExpenseStatusUnpaid && paymentDate.isEmpty) {
+        return true;
+      } else if (status.id == kExpenseStatusPaid && paymentDate.isNotEmpty) {
+        return true;
       }
     }
 

lib/ui/expense/expense_screen.dart

@@ -50,6 +50,16 @@ class ExpenseScreen extends StatelessWidget {
           ..id = kExpenseStatusInvoiced
           ..name = localization.invoiced,
       ),
+      ExpenseStatusEntity().rebuild(
+        (b) => b
+          ..id = kExpenseStatusPaid
+          ..name = localization.paid,
+      ),
+      ExpenseStatusEntity().rebuild(
+        (b) => b
+          ..id = kExpenseStatusUnpaid
+          ..name = localization.unpaid,
+      ),
     ];
 
     return ListScaffold(