add Executor.OnSelectPosition, make 0 atk monster go defense at default

Game/AI/DefaultExecutor.cs

@@ -127,6 +127,20 @@ namespace WindBot.Game.AI
             return true;
         }
 
+        /// <summary>
+        /// Called when the AI has to select a card position.
+        /// </summary>
+        /// <param name="cardId">Id of the card to position on the field.</param>
+        /// <param name="positions">List of available positions.</param>
+        /// <returns>Selected position, or 0 if no position is set for this card.</returns>
+        public override CardPosition OnSelectPosition(int cardId, IList<CardPosition> positions)
+        {
+            YGOSharp.OCGWrapper.NamedCard cardData = YGOSharp.OCGWrapper.NamedCard.Get(cardId);
+            if (cardData.Attack == 0)
+                return CardPosition.FaceUpDefence;
+            return base.OnSelectPosition(cardId, positions);
+        }
+
         public override bool OnSelectBattleReplay()
         {
             if (Bot.BattlingMonster == null)

Game/AI/Executor.cs

@@ -156,6 +156,12 @@ namespace WindBot.Game.AI
             return -1;
         }
 
+        public virtual CardPosition OnSelectPosition(int cardId, IList<CardPosition> positions)
+        {
+            // Overrided in DefalultExecutor
+            return 0;
+        }
+
         public virtual bool OnSelectBattleReplay()
         {
             // Overrided in DefalultExecutor

Game/GameAI.cs

@@ -443,13 +443,17 @@ namespace WindBot.Game
         /// <returns>Selected position.</returns>
         public CardPosition OnSelectPosition(int cardId, IList<CardPosition> positions)
         {
+            CardPosition selector_selected = m_position;
+            m_position = CardPosition.FaceUpAttack;
+
+            CardPosition executor_selected = Executor.OnSelectPosition(cardId, positions);
+
             // Selects the selected position if available, the first available otherwise.
-            if (positions.Contains(m_position))
-            {
-                CardPosition old = m_position;
-                m_position = CardPosition.FaceUpAttack;
-                return old;
-            }
+            if (positions.Contains(executor_selected))
+                return executor_selected;
+            if (positions.Contains(selector_selected))
+                return selector_selected;
+
             return positions[0];
         }