From 862b16cf8985f44ed8d4d5b5b0b6ece6294dc3b5 Mon Sep 17 00:00:00 2001
From: Crow <pengchengw@me.com>
Date: Fri, 19 Jun 2026 17:35:11 -0500
Subject: [PATCH] Immune targets =/= possible targets (#2486)

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DESIGN PHILOSOPHY: We prioritize STABILITY, PERFORMANCE, AND
PREDICTABILITY over behavioral realism.

Every action and decision executes PER BOT AND PER TRIGGER. Small
increases in logic complexity scale
poorly across thousands of bots and negatively affect all. We prioritize
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one. Bots don't need to behave perfectly; believable behavior is the
goal, not human simulation.
Default behavior must be cheap in processing; expensive behavior must be
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Before submitting, make sure your changes aligns with these principles.
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## Pull Request Description
<!-- Describe what this change does and why it is needed -->

This is mainly to address the issue of bots continuing to attack Mages
with Ice Block and Paladins with Divine Shield. I made the actual check
a little broader to capture all cases of when a target is both physical
and magical immune.

## Feature Evaluation
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- Describe the **minimum logic** required to achieve the intended
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- Describe the **processing cost** when this logic executes across many
bots.

Just added immunity checks to AttackersValue::IsPossibleTarget()

## How to Test the Changes
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The easiest way is to play a Mage or a Paladin and go zerg into the
opposing team, then put up Ice Block/Divine Shield.

## Impact Assessment
<!-- As a generic test, before and after measure of pmon (playerbot pmon
tick) can help you here. -->
- Does this change increase per-bot/per-tick processing or risk scaling
poorly with thousands of bots?
    - - [ ] No, not at all
    - - [x] Minimal impact (**explain below**)
    - - [ ] Moderate impact (**explain below**)

This is a new check when determining possible targets, but it should be
very cheap.

- Does this change modify default bot behavior?
    - - [ ] No
    - - [x] Yes (**explain why**)

Default bot behavior is idiotic as they stick to immune targets like
glue.

- Does this change add new decision branches or increase maintenance
complexity?
    - - [x] No
    - - [ ] Yes (**explain below**)



## AI Assistance
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Was AI assistance used while working on this change?
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- - [x] Yes (**explain below**)
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I wanted to capture more than just Ice Block and Divine Shield (which
would have been simple aura checks) so I had DeepSeek *shudder* look at
the spell flags.

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## Final Checklist

- - [x] Stability is not compromised.
- - [x] Performance impact is understood, tested, and acceptable.
- - [x] Added logic complexity is justified and explained.
- - [x] Any new bot dialogue lines are translated.
- - [x] Documentation updated if needed (Conf comments, WiKi commands).

## Notes for Reviewers
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---
 src/Ai/Base/Value/AttackersValue.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/Ai/Base/Value/AttackersValue.cpp b/src/Ai/Base/Value/AttackersValue.cpp
index 65a8edeb3..bec9edcd0 100644
--- a/src/Ai/Base/Value/AttackersValue.cpp
+++ b/src/Ai/Base/Value/AttackersValue.cpp
@@ -154,6 +154,11 @@ bool AttackersValue::IsPossibleTarget(Unit* attacker, Player* bot, float /*range
     if (attacker->HasUnitFlag(UNIT_FLAG_IMMUNE_TO_PC) || attacker->HasUnitFlag(UNIT_FLAG_NOT_SELECTABLE))
         return false;
 
+    // Skip targets that are immune to all damage (e.g., Ice Block, Divine Shield)
+    if (attacker->IsImmunedToDamage(SPELL_SCHOOL_MASK_NORMAL) &&
+        attacker->IsImmunedToDamage(SPELL_SCHOOL_MASK_MAGIC))
+        return false;
+
     // Relationship checks
     if (attacker->IsFriendlyTo(bot))
         return false;