From b5800afa65349bc8693deb51c6ca0afdafc1a0ee Mon Sep 17 00:00:00 2001
From: TRT <>
Date: Fri, 8 Oct 2021 15:14:24 +0200
Subject: [PATCH] Add extra sanity check

---
 forge-ai/src/main/java/forge/ai/ComputerUtilCombat.java    | 7 +++++++
 .../src/main/java/forge/ai/ability/DamagePreventAi.java    | 2 ++
 2 files changed, 9 insertions(+)

diff --git a/forge-ai/src/main/java/forge/ai/ComputerUtilCombat.java b/forge-ai/src/main/java/forge/ai/ComputerUtilCombat.java
index 20ec0060a27..826579d699f 100644
--- a/forge-ai/src/main/java/forge/ai/ComputerUtilCombat.java
+++ b/forge-ai/src/main/java/forge/ai/ComputerUtilCombat.java
@@ -263,8 +263,15 @@ public class ComputerUtilCombat {
      * @return a int.
      */
     public static int sumDamageIfUnblocked(final Iterable<Card> attackers, final Player attacked) {
+        return sumDamageIfUnblocked(attackers, attacked, false);
+    }
+    public static int sumDamageIfUnblocked(final Iterable<Card> attackers, final Player attacked, boolean onlyPreventable) {
         int sum = 0;
         for (final Card attacker : attackers) {
+            if (onlyPreventable && !attacker.canDamagePrevented(true)) {
+                continue;
+            }
+            // TODO always applies full prevention shields for each, so this might wrongly lower the result
             sum += damageIfUnblocked(attacker, attacked, null, false);
         }
         return sum;
diff --git a/forge-ai/src/main/java/forge/ai/ability/DamagePreventAi.java b/forge-ai/src/main/java/forge/ai/ability/DamagePreventAi.java
index 60541c2d738..8ea6208ffed 100644
--- a/forge-ai/src/main/java/forge/ai/ability/DamagePreventAi.java
+++ b/forge-ai/src/main/java/forge/ai/ability/DamagePreventAi.java
@@ -112,6 +112,8 @@ public class DamagePreventAi extends SpellAbilityAi {
         	final TargetChoices tcs = sa.getTargets();
             if (sa.canTarget(ai) && ComputerUtilCombat.wouldLoseLife(ai, combat)
                     && (ComputerUtilCombat.lifeInDanger(ai, combat) || sa.isAbility() || sa.isTrigger())
+                    // check if any of the incoming dmg is even preventable:
+                    && (ComputerUtilCombat.sumDamageIfUnblocked(combat.getAttackers(), ai, true) > ai.getPreventNextDamageTotalShields())
                     && game.getPhaseHandler().getPlayerTurn().isOpponentOf(ai)) {
             	tcs.add(ai);
                 chance = true;