Add possibility to reserve places to a free event

* added new event property which allows empty bills to be marked paid
* Add functionality to billbean which will mark zero-sum bill automatically paid
* Prevent online-payment buttons from being show if bill is already paid.

code/moya-beans/ejbModule/fi/codecrew/moya/beans/BillBean.java

@@ -33,6 +33,7 @@ import javax.ejb.EJBAccessException;
 import javax.ejb.LocalBean;
 import javax.ejb.Stateless;
 
+import fi.codecrew.moya.model.*;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -46,14 +47,6 @@ import fi.codecrew.moya.facade.BillFacade;
 import fi.codecrew.moya.facade.BillLineFacade;
 import fi.codecrew.moya.facade.EventUserFacade;
 import fi.codecrew.moya.facade.PlaceSlotFacade;
-import fi.codecrew.moya.model.Bill;
-import fi.codecrew.moya.model.BillLine;
-import fi.codecrew.moya.model.Discount;
-import fi.codecrew.moya.model.EventUser;
-import fi.codecrew.moya.model.FoodWave;
-import fi.codecrew.moya.model.LanEvent;
-import fi.codecrew.moya.model.PlaceSlot;
-import fi.codecrew.moya.model.Product;
 import fi.codecrew.moya.utilities.SearchResult;
 import fi.codecrew.moya.utilities.moyamessage.MoyaEventType;
 
@@ -234,7 +227,7 @@ public class BillBean implements BillBeanLocal {
 	/**
 	 * We will mark bill paid in different transaction. That's because we don't
 	 * wont it to fail if something other fails.
-	 * 
+	 *
 	 * @param bill
 	 * @param when
 	 * @param useCredits
@@ -278,12 +271,20 @@ public class BillBean implements BillBeanLocal {
 		billFacade.create(bill);
 		generateBillNumber(bill);
 		createPlaceslots(bill);
+
+		// If we allow bills with zero price
+		// we will mark them immediately as paid.
+		if (bill.getTotalPrice().compareTo(BigDecimal.ZERO) == 0
+			&& eventbean.getPropertyBoolean(LanEventPropertyKey.ALLOW_FREE_BILLS)) {
+			bill = billpbean.markPaid(bill, Calendar.getInstance(), false);
+		}
+
 		return bill;
 	}
 
 	/**
 	 * Create place slots for the bill
-	 * 
+	 *
 	 * @param bill
 	 */
 	private void createPlaceslots(Bill bill) {

code/moya-database/src/main/java/fi/codecrew/moya/model/LanEventPropertyKey.java

@@ -60,7 +60,8 @@ public enum LanEventPropertyKey {
 	/**
 	 * ISO 4217 code of currency.
 	 */
-	EVENT_CURRENCY_CODE(Type.TEXT, "EUR");
+	EVENT_CURRENCY_CODE(Type.TEXT, "EUR"),
+	ALLOW_FREE_BILLS(Type.BOOL),
 	;
 
 	public enum Type {

code/moya-web/src/main/java/fi/codecrew/moya/web/cdiview/shop/BillEditView.java

@@ -18,6 +18,7 @@
  */
 package fi.codecrew.moya.web.cdiview.shop;
 
+import java.util.ArrayList;
 import java.util.Calendar;
 import java.util.List;
 
@@ -78,12 +79,12 @@ public class BillEditView extends GenericCDIView {
 
 	public boolean isCheckoutFiAvailable()
 	{
-		return checkoutbean.isPaymentEnabled();
+		return bill != null && !bill.isPaid() && checkoutbean.isPaymentEnabled();
 	}
 
 	public boolean isVerkkomaksuFiAvailable()
 	{
-		return vmbean.isSvmEnabled();
+		return bill != null && !bill.isPaid() && vmbean.isSvmEnabled();
 	}
 
 	public List<CheckoutBank> getCheckoutFiToken()