Implemented support for MustBeBlockedByAtLeastOne...Effect. (ongoing).

Mage.Sets/src/mage/sets/darkascension/DeadlyAllure.java

@@ -30,9 +30,8 @@ package mage.sets.darkascension;
 import java.util.UUID;
 
 import mage.constants.*;
-import mage.abilities.common.SimpleStaticAbility;
 import mage.abilities.costs.mana.ManaCostsImpl;
-import mage.abilities.effects.common.combat.MustBeBlockedByAllSourceEffect;
+import mage.abilities.effects.common.combat.MustBeBlockedByAtLeastOneTargetEffect;
 import mage.abilities.effects.common.continious.GainAbilityTargetEffect;
 import mage.abilities.keyword.DeathtouchAbility;
 import mage.abilities.keyword.FlashbackAbility;
@@ -51,9 +50,9 @@ public class DeadlyAllure extends CardImpl<DeadlyAllure> {
 
         this.color.setBlack(true);
 
-        // Target creature gains deathtouch until end of turn and must be blocked this turn if able.
+        // Target creature gains deathtouch until end of turn and must be blocked this turn if able.        
-        this.getSpellAbility().addEffect(new GainAbilityTargetEffect(new SimpleStaticAbility(Zone.BATTLEFIELD, new MustBeBlockedByAllSourceEffect()), Duration.EndOfTurn));
         this.getSpellAbility().addEffect(new GainAbilityTargetEffect(DeathtouchAbility.getInstance(), Duration.EndOfTurn));
+        this.getSpellAbility().addEffect(new MustBeBlockedByAtLeastOneTargetEffect(Duration.EndOfTurn));
         this.getSpellAbility().addTarget(new TargetCreaturePermanent());
 
         // Flashback {G}

Mage.Sets/src/mage/sets/riseoftheeldrazi/IrresistiblePrey.java

@@ -28,16 +28,14 @@
 package mage.sets.riseoftheeldrazi;
 
 import java.util.UUID;
-
-import mage.constants.CardType;
-import mage.constants.Rarity;
 import mage.abilities.common.SimpleStaticAbility;
 import mage.abilities.effects.common.DrawCardControllerEffect;
-import mage.abilities.effects.common.combat.MustBeBlockedByAllSourceEffect;
 import mage.abilities.effects.common.combat.MustBeBlockedByAtLeastOneTargetEffect;
 import mage.abilities.effects.common.continious.GainAbilityTargetEffect;
 import mage.cards.CardImpl;
+import mage.constants.CardType;
 import mage.constants.Duration;
+import mage.constants.Rarity;
 import mage.constants.Zone;
 import mage.target.common.TargetCreaturePermanent;
 

Mage/src/mage/abilities/effects/common/combat/MustBeBlockedByAtLeastOneSourceEffect.java

@@ -81,7 +81,7 @@ public class MustBeBlockedByAtLeastOneSourceEffect extends RequirementEffect<Mus
 
     @Override
     public boolean applies(Permanent permanent, Ability source, Game game) {
-        return true;
+        return permanent.canBlock(source.getSourceId(), game);
     }
 
     @Override

Mage/src/mage/abilities/effects/common/combat/MustBeBlockedByAtLeastOneTargetEffect.java

@@ -37,6 +37,9 @@ import mage.game.permanent.Permanent;
 
 
 /**
+ * !! This effect does only support one target.
+ *
+ *
  * http://tappedout.net/mtg-questions/must-be-blocked-if-able-effect-makes-other-attacking-creatures-essentially-unblockable/
  *
  * When you Declare Blockers, you choose an arrangement for your blockers,
@@ -81,7 +84,7 @@ public class MustBeBlockedByAtLeastOneTargetEffect extends RequirementEffect<Mus
 
     @Override
     public boolean applies(Permanent permanent, Ability source, Game game) {
-        return true;
+        return permanent.canBlock(this.getTargetPointer().getFirst(game, source), game);
     }
 
     @Override

Mage/src/mage/game/combat/Combat.java

@@ -340,11 +340,31 @@ public class Combat implements Serializable, Copyable<Combat> {
 
     public boolean checkBlockRequirementsAfter(Player player, Player controller, Game game) {
         //20101001 - 509.1c
+        // check mustBeBlockedByAtLeastOne
+        Map<UUID, Set<UUID>> mustBeBlockedByAtLeastOne = new HashMap<UUID, Set<UUID>>();
+
+        // check mustBlockAny
         for (Permanent creature : game.getBattlefield().getActivePermanents(new FilterControlledCreaturePermanent(), player.getId(), game)) {
             // Does the creature not block and is an opponent of the attacker
             if (creature.getBlocking() == 0 && game.getOpponents(attackerId).contains(creature.getControllerId())) {
                 // get all requiremet effects that apply to the creature
-                for (RequirementEffect effect : game.getContinuousEffects().getApplicableRequirementEffects(creature, game).keySet()) {
+                for (Map.Entry entry : game.getContinuousEffects().getApplicableRequirementEffects(creature, game).entrySet()) {
+                    RequirementEffect effect = (RequirementEffect)entry.getKey();
+                    // get possible mustBeBlockedByAtLeastOne blocker
+                    for (Ability ability: (HashSet<Ability>)entry.getValue()) {
+                        UUID toBeBlockedCreature = effect.mustBlockAttackerIfElseUnblocked(ability, game);
+                        if (toBeBlockedCreature != null) {
+                            Set<UUID> potentialBlockers;
+                            if (mustBeBlockedByAtLeastOne.containsKey(toBeBlockedCreature)) {
+                                potentialBlockers = mustBeBlockedByAtLeastOne.get(toBeBlockedCreature);
+                            } else {
+                                potentialBlockers = new HashSet<UUID>();
+                                mustBeBlockedByAtLeastOne.put(toBeBlockedCreature, potentialBlockers);
+                            }
+                            potentialBlockers.add(creature.getId());
+                        }
+                    }
+
                     // check the mustBlockAny
                     if (effect.mustBlockAny(game)) {
                         // check that it can block at least one of the attackers
@@ -376,6 +396,36 @@ public class Combat implements Serializable, Copyable<Combat> {
                 }
             }
         }
+
+        // check mustBeBlockedByAtLeastOne
+        // TODO: Check if already blocking creatures that block other creatures have no madatory block and have to block here
+        for (UUID toBeBlockedCreatureId: mustBeBlockedByAtLeastOne.keySet()) {
+            for (CombatGroup combatGroup : game.getCombat().getGroups()) {
+                if (combatGroup.getBlockers().isEmpty() && combatGroup.getAttackers().contains(toBeBlockedCreatureId)) {
+                    // creature is not blocked but has possible blockers
+                    if (controller.isHuman()) {
+                        Permanent toBeBlockedCreature = game.getPermanent(toBeBlockedCreatureId);
+                        if (toBeBlockedCreature != null) {
+                            game.informPlayer(controller, new StringBuilder(toBeBlockedCreature.getName()).append(" has to be blocked by at least one creature.").toString());
+                        }
+                        return false;
+                    } else {
+                        // take the first potential blocker from the set to block for the AI
+                        UUID blockingCreatureId = mustBeBlockedByAtLeastOne.get(toBeBlockedCreatureId).iterator().next();
+                        Permanent blockingCreature = game.getPermanent(blockingCreatureId);
+                        if (blockingCreature != null) {
+                            Player defender = game.getPlayer(blockingCreature.getControllerId());
+                            if (defender != null) {
+                                defender.declareBlocker(defender.getId(), blockingCreatureId, toBeBlockedCreatureId, game);
+                            }
+                        }
+                    }
+                }
+            }
+
+        }
+
+
         return true;
     }