Core/AI: Added CreatureAI hook that is getting triggered when a spell cast has been successfully finished.

Source/Game/AI/CoreAI/CreatureAI.cs

@@ -435,6 +435,9 @@ namespace Game.AI
         // Called when a spell cast gets interrupted
         public virtual void OnSpellCastInterrupt(SpellInfo spell) { }
 
+        // Called when a spell cast has been successfully finished
+        public virtual void OnSuccessfulSpellCast(SpellInfo spell) { }
+
         // Called at reaching home after evade
         public virtual void JustReachedHome() { }
         

Source/Game/Spells/Spell.cs

@@ -2954,6 +2954,12 @@ namespace Game.Spells
                 hitMask |= ProcFlagsHit.Normal;
 
             m_originalCaster.ProcSkillsAndAuras(null, procAttacker, ProcFlags.None, ProcFlagsSpellType.MaskAll, ProcFlagsSpellPhase.Cast, hitMask, this, null, null);
+
+            // Call CreatureAI hook OnSuccessfulSpellCast
+            Creature caster = m_originalCaster.ToCreature();
+            if (caster)
+                if (caster.IsAIEnabled)
+                    caster.GetAI().OnSuccessfulSpellCast(GetSpellInfo());
         }
 
         void handle_immediate()