Bugfix: assign unique (negative) ids to blank cards; previously the wrong card could win if multiple blanks were being judged in the same round.

WebContent/js/cah.card.js

@@ -341,7 +341,7 @@ cah.inherits(cah.card.WhiteCard, cah.card.BaseCard);
  * @returns True if this is a blank card.
  */
 cah.card.WhiteCard.prototype.isBlankCard = function() {
-  return this.getServerId() == 0;
+  return this.getServerId() < -1;
 };
 
 /**

WebContent/js/cah.game.js

@@ -476,7 +476,7 @@ cah.Game.prototype.setRoundWhiteCards = function(cardSets) {
       var cardData = cardSets[setIndex][index];
       var card;
       var id = cardData[cah.$.WhiteCardData.ID];
-      if (id >= 0) {
+      if (id != -1) {
         card = new cah.card.WhiteCard(true, id);
         card.setText(cardData[cah.$.WhiteCardData.TEXT]);
         card.setWatermark(cardData[cah.$.WhiteCardData.WATERMARK]);
@@ -947,17 +947,17 @@ cah.Game.prototype.confirmClick_ = function() {
     }
   } else {
     if (this.handSelectedCard_ != null) {
+      var ajax = cah.Ajax.build(cah.$.AjaxOperation.PLAY_CARD).withGameId(this.id_).withCardId(
+          this.handSelectedCard_.getServerId());
       if (this.handSelectedCard_.isBlankCard()) {
     	  // blank card
     	  var text = prompt("What would you like this card to say?", "");
     	  if (text == null || text == '') { return; }
     	  text = $("<div/>").text(text).html();		// html sanitise
     	  this.handSelectedCard_.setText(text);
-          cah.Ajax.build(cah.$.AjaxOperation.PLAY_CARD).withGameId(this.id_).withCardId(0).withMessage(text).run();
-      } else {
-        cah.Ajax.build(cah.$.AjaxOperation.PLAY_CARD).withGameId(this.id_).withCardId(
-          this.handSelectedCard_.getServerId()).run();
+    	  ajax = ajax.withMessage(text);
       }
+      ajax.run();
     }
   }
 };

src/net/socialgamer/cah/data/Game.java

@@ -1209,8 +1209,6 @@ public class Game {
             playCard = card;
             if (WhiteDeck.isBlankCard(card)) {
               playCard.setText(cardText);
-              // note that since blank cards are indistinguishable to the server, we might end up
-              // removing a different card than the client did.  but this shouldn't break anything.
             }
             // remove the card from their hand. the client will also do so when we return
             // success, so no need to tell it to do so here.

src/net/socialgamer/cah/data/WhiteDeck.java

@@ -45,6 +45,7 @@ public class WhiteDeck {
   private final List<WhiteCard> deck;
   private final List<WhiteCard> dealt;
   private final List<WhiteCard> discard;
+  private int lastBlankCardId = -1;
 
   /**
    * Create a new white card deck, loading the cards from the database and shuffling them.
@@ -89,9 +90,8 @@ public class WhiteDeck {
   public synchronized void discard(final WhiteCard card) {
     if (card != null) {
       if (isBlankCard(card)) {
-        // create a fresh blank card to ensure player text is cleared
-        discard.add(createBlankCard());
-      } else {
+        card.setText("____"); // clear any player text
+      }
       discard.add(card);
     }
   }
@@ -113,7 +113,7 @@ public class WhiteDeck {
    */
   private WhiteCard createBlankCard() {
     final WhiteCard blank = new WhiteCard();
-    blank.setId(0);
+    blank.setId(--lastBlankCardId);
     blank.setText("____");
     blank.setWatermark("____");
     return blank;
@@ -127,6 +127,6 @@ public class WhiteDeck {
    * @return True if the card is a blank card.
    */
   public static boolean isBlankCard(final WhiteCard card) {
-    return card.getId() == 0;
+    return card.getId() < -1;
   }
 }