add an AF_ChooseCard. It's pretty specific right now, but can be generalized/tweaked for when/how the needs arise

src/main/java/forge/Card.java

@@ -358,10 +358,8 @@ public class Card extends GameEntity implements Comparable<Card> {
 
     private long timestamp = -1; // permanents on the battlefield
 
-    private ArrayList<CardPowerToughness> newPT = new ArrayList<CardPowerToughness>(); // stack
-                                                                                       // of
-                                                                                       // set
-                                                                                       // power/toughness
+    //stack of set power/toughness
+    private ArrayList<CardPowerToughness> newPT = new ArrayList<CardPowerToughness>();
     private int baseLoyalty = 0;
     private String baseAttackString = null;
     private String baseDefenseString = null;
@@ -405,6 +403,7 @@ public class Card extends GameEntity implements Comparable<Card> {
     private String namedCard = "";
     private int chosenNumber;
     private Player chosenPlayer;
+    private ArrayList<Card> chosenCard = new ArrayList<Card>();
 
     private Card cloneOrigin = null;
     private final ArrayList<Card> clones = new ArrayList<Card>();
@@ -2116,6 +2115,29 @@ public class Card extends GameEntity implements Comparable<Card> {
         this.chosenColor = s;
     }
 
+    /**
+     * <p>
+     * Getter for the field <code>chosenCard</code>.
+     * </p>
+     * 
+     * @return an ArrayList<Card> object.
+     */
+    public final ArrayList<Card> getChosenCard() {
+        return this.chosenCard;
+    }
+
+    /**
+     * <p>
+     * Setter for the field <code>chosenCard</code>.
+     * </p>
+     * 
+     * @param c
+     *            an ArrayList<String> object.
+     */
+    public final void setChosenCard(final ArrayList<Card> c) {
+        this.chosenCard = c;
+    }
+
     // used for cards like Meddling Mage...
     /**
      * <p>
@@ -4032,9 +4054,8 @@ public class Card extends GameEntity implements Comparable<Card> {
      * </p>
      */
     public final void unEquipAllCards() {
-        while (this.equippedBy.size() > 0) { // while there exists equipment,
-                                             // unequip
-            // the first one
+        //while there exists equipment, unequip the first one
+        while (this.equippedBy.size() > 0) {
             this.equippedBy.get(0).unEquipCard(this);
         }
     }
@@ -5351,9 +5372,8 @@ public class Card extends GameEntity implements Comparable<Card> {
     public final void clearAllKeywords() {
         this.getCharacteristics().getIntrinsicKeyword().clear();
         this.extrinsicKeyword.clear();
-        this.hiddenExtrinsicKeyword.clear(); // Hidden keywords won't be
-                                             // displayed on
-        // the card
+        //Hidden keywords won't be displayed on the card
+        this.hiddenExtrinsicKeyword.clear();
     }
 
     /**
@@ -6505,9 +6525,8 @@ public class Card extends GameEntity implements Comparable<Card> {
             return false;
         }
 
-        final String[] incR = restriction.split("\\.", 2); // Inclusive
-                                                           // restrictions are
-        // Card types
+        //Inclusive restrictions are Card types
+        final String[] incR = restriction.split("\\.", 2);
 
         if (incR[0].equals("Spell") && !this.isSpell()) {
             return false;
@@ -6566,6 +6585,10 @@ public class Card extends GameEntity implements Comparable<Card> {
             if (!this.getName().equals(source.getNamedCard())) {
                 return false;
             }
+        } else if (property.equals("ChosenCard")) {
+            if (!source.getChosenCard().contains(this)) {
+                return false;
+            }
         }
         // ... Card colors
         else if (property.contains("White") || property.contains("Blue") || property.contains("Black")
@@ -7932,11 +7955,8 @@ public class Card extends GameEntity implements Comparable<Card> {
      */
     public final void addDamage(final Map<Card, Integer> sourcesMap) {
         for (final Entry<Card, Integer> entry : sourcesMap.entrySet()) {
-            this.addDamageAfterPrevention(entry.getValue(), entry.getKey(), true); // damage
-            // prevention
-            // is
-            // already
-            // checked!
+            //damage prevention is already checked!
+            this.addDamageAfterPrevention(entry.getValue(), entry.getKey(), true);
         }
     }
 
@@ -8447,9 +8467,8 @@ public class Card extends GameEntity implements Comparable<Card> {
             }
         }
 
-        if (!this.isInZone(Constant.Zone.Battlefield)) { // keywords don't work
-                                                         // outside the
-                                                         // battlefield
+        //keywords don't work outside battlefield
+        if (!this.isInZone(Constant.Zone.Battlefield)) {
             return true;
         }
 

src/main/java/forge/card/abilityfactory/AbilityFactory.java

@@ -430,6 +430,16 @@ public class AbilityFactory {
             }
         }
 
+        else if (this.api.equals("ChooseCard")) {
+            if (this.isAb) {
+                spellAbility = AbilityFactoryChoose.createAbilityChooseCard(this);
+            } else if (this.isSp) {
+                spellAbility = AbilityFactoryChoose.createSpellChooseCard(this);
+            } else if (this.isDb) {
+                spellAbility = AbilityFactoryChoose.createDrawbackChooseCard(this);
+            }
+        }
+
         else if (this.api.equals("ChooseColor")) {
             if (this.isAb) {
                 spellAbility = AbilityFactoryChoose.createAbilityChooseColor(this);
@@ -517,9 +527,8 @@ public class AbilityFactory {
         else if (this.api.equals("Counter")) {
             final AbilityFactoryCounterMagic c = new AbilityFactoryCounterMagic(this);
 
-            if (this.isTargeted) { // Since all "Counter" ABs Counter things on
-                                   // the
-                // Stack no need for it to be everywhere
+            //Since all "Counter" ABs Counter things on the Stack no need for it to be everywhere
+            if (this.isTargeted) {
                 this.abTgt.setZone(Zone.Stack);
             }
 

src/main/java/forge/card/abilityfactory/AbilityFactoryChoose.java

@@ -32,7 +32,7 @@ import forge.item.CardPrinted;
 
 /**
  * <p>
- * AbilityFactory_Choose class.
+ * AbilityFactoryChoose class.
  * </p>
  * 
  * @author Forge
@@ -1156,7 +1156,17 @@ public final class AbilityFactoryChoose {
                     card.setChosenPlayer(chosen);
 
                 } else {
-                    // TODO - not implemented
+                    if (params.containsKey("AILogic")) {
+                        if (params.get("AILogic").equals("Curse")) {
+                            card.setChosenPlayer(AllZone.getHumanPlayer());
+                        }
+                        else {
+                            card.setChosenPlayer(AllZone.getComputerPlayer());
+                        }
+                    }
+                    else {
+                        card.setChosenPlayer(AllZone.getComputerPlayer());
+                    }
                 }
             }
         }
@@ -1435,5 +1445,245 @@ public final class AbilityFactoryChoose {
             }
         }
     }
+    
+    // *************************************************************************
+    // *************************** ChooseCard **********************************
+    // *************************************************************************
 
-} // end class AbilityFactory_Choose
+    /**
+     * <p>
+     * createAbilityChooseCard.
+     * </p>
+     * 
+     * @param af
+     *            a {@link forge.card.abilityFactory.AbilityFactory} object.
+     * @return a {@link forge.card.spellability.SpellAbility} object.
+     */
+    public static SpellAbility createAbilityChooseCard(final AbilityFactory af) {
+        final SpellAbility abChooseCard = new AbilityActivated(af.getHostCard(), af.getAbCost(), af.getAbTgt()) {
+            private static final long serialVersionUID = 2399435577106102311L;
+
+            @Override
+            public String getStackDescription() {
+                return chooseCardStackDescription(af, this);
+            }
+
+            @Override
+            public boolean canPlayAI() {
+                return chooseCardCanPlayAI(af, this);
+            }
+
+            @Override
+            public void resolve() {
+                chooseCardResolve(af, this);
+            }
+
+            @Override
+            public boolean doTrigger(final boolean mandatory) {
+                return chooseCardTriggerAI(af, this, mandatory);
+            }
+
+        };
+        return abChooseCard;
+    }
+
+    /**
+     * <p>
+     * createSpellChooseCard.
+     * </p>
+     * 
+     * @param af
+     *            a {@link forge.card.abilityFactory.AbilityFactory} object.
+     * @return a {@link forge.card.spellability.SpellAbility} object.
+     * @since 1.1.7
+     */
+    public static SpellAbility createSpellChooseCard(final AbilityFactory af) {
+        final SpellAbility spChooseCard = new Spell(af.getHostCard(), af.getAbCost(), af.getAbTgt()) {
+            private static final long serialVersionUID = 1425536663625668893L;
+
+            @Override
+            public String getStackDescription() {
+                return chooseCardStackDescription(af, this);
+            }
+
+            @Override
+            public boolean canPlayAI() {
+                return chooseCardCanPlayAI(af, this);
+            }
+
+            @Override
+            public void resolve() {
+                chooseCardResolve(af, this);
+            }
+
+        };
+        return spChooseCard;
+    }
+
+    /**
+     * <p>
+     * createDrawbackChooseCard.
+     * </p>
+     * 
+     * @param af
+     *            a {@link forge.card.abilityFactory.AbilityFactory} object.
+     * @return a {@link forge.card.spellability.SpellAbility} object.
+     */
+    public static SpellAbility createDrawbackChooseCard(final AbilityFactory af) {
+        final SpellAbility dbChooseCard = new AbilitySub(af.getHostCard(), af.getAbTgt()) {
+            private static final long serialVersionUID = -3255569671897226555L;
+
+            @Override
+            public String getStackDescription() {
+                return chooseCardStackDescription(af, this);
+            }
+
+            @Override
+            public void resolve() {
+                chooseCardResolve(af, this);
+            }
+
+            @Override
+            public boolean chkAIDrawback() {
+                return true;
+            }
+
+            @Override
+            public boolean doTrigger(final boolean mandatory) {
+                return chooseCardTriggerAI(af, this, mandatory);
+            }
+
+        };
+        return dbChooseCard;
+    }
+
+    /**
+     * <p>
+     * chooseCardStackDescription.
+     * </p>
+     * 
+     * @param af
+     *            a {@link forge.card.abilityFactory.AbilityFactory} object.
+     * @param sa
+     *            a {@link forge.card.spellability.SpellAbility} object.
+     * @return a {@link java.lang.String} object.
+     */
+    private static String chooseCardStackDescription(final AbilityFactory af, final SpellAbility sa) {
+        StringBuilder sb = new StringBuilder();
+
+        if (sa instanceof AbilitySub) {
+            sb.append(" ");
+        } else {
+            sb.append(sa.getSourceCard()).append(" - ");
+        }
+
+        ArrayList<Player> tgtPlayers;
+
+        Target tgt = af.getAbTgt();
+        if (tgt != null) {
+            tgtPlayers = tgt.getTargetPlayers();
+        } else {
+            tgtPlayers = AbilityFactory.getDefinedPlayers(sa.getSourceCard(), af.getMapParams().get("Defined"), sa);
+        }
+
+        for (Player p : tgtPlayers) {
+            sb.append(p).append(" ");
+        }
+        sb.append("chooses a card.");
+
+        AbilitySub abSub = sa.getSubAbility();
+        if (abSub != null) {
+            sb.append(abSub.getStackDescription());
+        }
+
+        return sb.toString();
+    }
+
+    /**
+     * <p>
+     * chooseCardCanPlayAI.
+     * </p>
+     * 
+     * @param af
+     *            a {@link forge.card.abilityFactory.AbilityFactory} object.
+     * @param sa
+     *            a {@link forge.card.spellability.SpellAbility} object.
+     * @return a boolean.
+     */
+    private static boolean chooseCardCanPlayAI(final AbilityFactory af, final SpellAbility sa) {
+        return chooseCardTriggerAI(af, sa, false);
+    }
+
+    /**
+     * <p>
+     * chooseCardTriggerAI.
+     * </p>
+     * 
+     * @param af
+     *            a {@link forge.card.abilityFactory.AbilityFactory} object.
+     * @param sa
+     *            a {@link forge.card.spellability.SpellAbility} object.
+     * @param mandatory
+     *            a boolean.
+     * @return a boolean.
+     */
+    private static boolean chooseCardTriggerAI(final AbilityFactory af, final SpellAbility sa, final boolean mandatory) {
+        return false;
+    }
+
+    /**
+     * <p>
+     * chooseCardResolve.
+     * </p>
+     * 
+     * @param af
+     *            a {@link forge.card.abilityFactory.AbilityFactory} object.
+     * @param sa
+     *            a {@link forge.card.spellability.SpellAbility} object.
+     */
+    private static void chooseCardResolve(final AbilityFactory af, final SpellAbility sa) {
+        HashMap<String, String> params = af.getMapParams();
+        Card host = af.getHostCard();
+
+        ArrayList<Player> tgtPlayers;
+
+        Target tgt = af.getAbTgt();
+        if (tgt != null) {
+            tgtPlayers = tgt.getTargetPlayers();
+        } else {
+            tgtPlayers = AbilityFactory.getDefinedPlayers(sa.getSourceCard(), params.get("Defined"), sa);
+        }
+
+        CardList choices = AllZoneUtil.getCardsIn(Zone.Battlefield);
+        if (params.containsKey("Choices")) {
+            choices = choices.getValidCards(params.get("Choices"), host.getController(), host);
+        }
+
+        for (Player p : tgtPlayers) {
+            if (tgt == null || p.canBeTargetedBy(sa)) {
+                ArrayList<Card> chosen = new ArrayList<Card>();
+                if (sa.getActivatingPlayer().isHuman()) {
+                    CardList land = AllZoneUtil.getLandsInPlay();
+                    final ArrayList<String> basic = CardUtil.getBasicTypes();
+
+                    for (final String type : basic) {
+                        final CardList cl = land.getType(type);
+                        if (cl.size() > 0) {
+                            String prompt = "Choose a" + (type.equals("Island") ? "n " : " ") + type;
+                            Object o = GuiUtils.getChoice(prompt, cl.toArray());
+                            if (null != o) {
+                                Card c = (Card) o;
+                                chosen.add(c);
+                            }
+                        }
+                    }
+
+                } else {
+                    // TODO - not implemented
+                }
+                host.setChosenCard(chosen);
+            }
+        }
+    }
+
+} // end class AbilityFactoryChoose