Core/SAI: Implement SMART_TARGET_ACTION_INVOKER in SMART_EVENT_FRIENDLY_HEALTH_PCT (#25318)

* Core/SAI: Implement SMART_TARGET_ACTION_INVOKER in SMART_EVENT_FRIENDLY_HEALTH_PCT

* Require radius (5th parameter) to be set

(cherry picked from commit cbed1039c47f0e3487cea555bb8552a4e6445f5a)

4 files changed, 37 insertions, 14 deletions

diff --git a/src/server/game/AI/SmartScripts/SmartScript.cpp b/src/server/game/AI/SmartScripts/SmartScript.cpp
index 4dce17ab33a..37b5a737cd4 100644
--- a/src/server/game/AI/SmartScripts/SmartScript.cpp
+++ b/src/server/game/AI/SmartScripts/SmartScript.cpp
@@ -3598,7 +3598,7 @@ void SmartScript::ProcessEvent(SmartScriptHolder& e, Unit* unit, uint32 var0, ui
             if (!me || !me->IsEngaged())
                 return;
 
-            ObjectVector targets;
+            Unit* unitTarget = nullptr;
             switch (e.GetTargetType())
             {
                 case SMART_TARGET_CREATURE_RANGE:
@@ -3608,24 +3608,29 @@ void SmartScript::ProcessEvent(SmartScriptHolder& e, Unit* unit, uint32 var0, ui
                 case SMART_TARGET_CLOSEST_PLAYER:
                 case SMART_TARGET_PLAYER_RANGE:
                 case SMART_TARGET_PLAYER_DISTANCE:
+                {
+                    ObjectVector targets;
                     GetTargets(targets, e);
-                    break;
-                default:
-                    return;
-            }
 
-            Unit* unitTarget = nullptr;
-            for (WorldObject* target : targets)
-            {
-                if (IsUnit(target) && me->IsFriendlyTo(target->ToUnit()) && target->ToUnit()->IsAlive() && target->ToUnit()->IsInCombat())
-                {
-                    uint32 healthPct = uint32(target->ToUnit()->GetHealthPct());
-                    if (healthPct > e.event.friendlyHealthPct.maxHpPct || healthPct < e.event.friendlyHealthPct.minHpPct)
-                        continue;
+                    for (WorldObject* target : targets)
+                    {
+                        if (IsUnit(target) && me->IsFriendlyTo(target->ToUnit()) && target->ToUnit()->IsAlive() && target->ToUnit()->IsInCombat())
+                        {
+                            uint32 healthPct = uint32(target->ToUnit()->GetHealthPct());
+                            if (healthPct > e.event.friendlyHealthPct.maxHpPct || healthPct < e.event.friendlyHealthPct.minHpPct)
+                                continue;
 
-                    unitTarget = target->ToUnit();
+                            unitTarget = target->ToUnit();
+                            break;
+                        }
+                    }
                     break;
                 }
+                case SMART_TARGET_ACTION_INVOKER:
+                    unitTarget = DoSelectLowestHpPercentFriendly((float)e.event.friendlyHealthPct.radius, e.event.friendlyHealthPct.minHpPct, e.event.friendlyHealthPct.maxHpPct);
+                    break;
+                default:
+                    return;
             }
 
             if (!unitTarget)
@@ -4231,6 +4236,18 @@ Unit* SmartScript::DoSelectLowestHpFriendly(float range, uint32 MinHPDiff) const
     return unit;
 }
 
+Unit* SmartScript::DoSelectLowestHpPercentFriendly(float range, uint32 minHpPct, uint32 maxHpPct) const
+{
+    if (!me)
+        return nullptr;
+
+    Unit* unit = nullptr;
+    Trinity::MostHPPercentMissingInRange u_check(me, range, minHpPct, maxHpPct);
+    Trinity::UnitLastSearcher<Trinity::MostHPPercentMissingInRange> searcher(me, unit, u_check);
+    Cell::VisitGridObjects(me, searcher, range);
+    return unit;
+}
+
 void SmartScript::DoFindFriendlyCC(std::vector<Creature*>& creatures, float range) const
 {
     if (!me)
diff --git a/src/server/game/AI/SmartScripts/SmartScript.h b/src/server/game/AI/SmartScripts/SmartScript.h
index 5e88f2608fe..5376e251d6a 100644
--- a/src/server/game/AI/SmartScripts/SmartScript.h
+++ b/src/server/game/AI/SmartScripts/SmartScript.h
@@ -70,6 +70,7 @@ class TC_GAME_API SmartScript
         void OnMoveInLineOfSight(Unit* who);
 
         Unit* DoSelectLowestHpFriendly(float range, uint32 MinHPDiff) const;
+        Unit* DoSelectLowestHpPercentFriendly(float range, uint32 minHpPct, uint32 maxHpPct) const;
         void DoFindFriendlyCC(std::vector<Creature*>& creatures, float range) const;
         void DoFindFriendlyMissingBuff(std::vector<Creature*>& creatures, float range, uint32 spellid) const;
         Unit* DoFindClosestFriendlyInRange(float range, bool playerOnly) const;
diff --git a/src/server/game/AI/SmartScripts/SmartScriptMgr.cpp b/src/server/game/AI/SmartScripts/SmartScriptMgr.cpp
index fc8bfd7877d..0f7d64c2d54 100644
--- a/src/server/game/AI/SmartScripts/SmartScriptMgr.cpp
+++ b/src/server/game/AI/SmartScripts/SmartScriptMgr.cpp
@@ -1018,6 +1018,10 @@ bool SmartAIMgr::IsEventValid(SmartScriptHolder& e)
                     case SMART_TARGET_PLAYER_RANGE:
                     case SMART_TARGET_PLAYER_DISTANCE:
                         break;
+                    case SMART_TARGET_ACTION_INVOKER:
+                        if (!NotNULL(e, e.event.friendlyHealthPct.radius))
+                            return false;
+                        break;
                     default:
                         TC_LOG_ERROR("sql.sql", "SmartAIMgr: Entry " SI64FMTD " SourceType %u Event %u Action %u uses invalid target_type %u, skipped.", e.entryOrGuid, e.GetScriptType(), e.event_id, e.GetActionType(), e.GetTargetType());
                         return false;
diff --git a/src/server/game/AI/SmartScripts/SmartScriptMgr.h b/src/server/game/AI/SmartScripts/SmartScriptMgr.h
index 60f28387014..4a4c7b562f1 100644
--- a/src/server/game/AI/SmartScripts/SmartScriptMgr.h
+++ b/src/server/game/AI/SmartScripts/SmartScriptMgr.h
@@ -422,6 +422,7 @@ struct SmartEvent
             uint32 maxHpPct;
             uint32 repeatMin;
             uint32 repeatMax;
+            uint32 radius;
         } friendlyHealthPct;
 
         struct