Core/Spells: Implement SPELL_EFFECT_UNTRAIN_TALENTS, thanks to Heisenberg, closes issue #5238

--HG--
branch : trunk

src/server/game/Entities/Player/Player.cpp

@@ -13911,7 +13911,7 @@ void Player::OnGossipSelect(WorldObject* pSource, uint32 gossipListId, uint32 me
             break;
         case GOSSIP_OPTION_UNLEARNTALENTS:
             PlayerTalkClass->CloseGossip();
-            SendTalentWipeConfirm(guid);
+            pSource->ToCreature()->CastSpell(this, 46331, true); // Trainer: Untrain Talents
             break;
         case GOSSIP_OPTION_UNLEARNPETTALENTS:
             PlayerTalkClass->CloseGossip();

src/server/game/Spells/Spell.h

@@ -319,6 +319,7 @@ class Spell
         void EffectDualWield(SpellEffIndex effIndex);
         void EffectPickPocket(SpellEffIndex effIndex);
         void EffectAddFarsight(SpellEffIndex effIndex);
+        void EffectUntrainTalents(SpellEffIndex effIndex);
         void EffectHealMechanical(SpellEffIndex effIndex);
         void EffectJump(SpellEffIndex effIndex);
         void EffectJumpDest(SpellEffIndex effIndex);

src/server/game/Spells/SpellEffects.cpp

@@ -137,7 +137,7 @@ pEffect SpellEffects[TOTAL_SPELL_EFFECTS]=
     &Spell::EffectPull,                                     // 70 SPELL_EFFECT_PULL                     one spell: Distract Move
     &Spell::EffectPickPocket,                               // 71 SPELL_EFFECT_PICKPOCKET
     &Spell::EffectAddFarsight,                              // 72 SPELL_EFFECT_ADD_FARSIGHT
-    &Spell::EffectUnused,                                   // 73 SPELL_EFFECT_UNTRAIN_TALENTS
+    &Spell::EffectUntrainTalents,                           // 73 SPELL_EFFECT_UNTRAIN_TALENTS
     &Spell::EffectApplyGlyph,                               // 74 SPELL_EFFECT_APPLY_GLYPH
     &Spell::EffectHealMechanical,                           // 75 SPELL_EFFECT_HEAL_MECHANICAL          one spell: Mechanical Patch Kit
     &Spell::EffectSummonObjectWild,                         // 76 SPELL_EFFECT_SUMMON_OBJECT_WILD
@@ -3314,6 +3314,15 @@ void Spell::EffectAddFarsight(SpellEffIndex effIndex)
     //m_caster->ToPlayer()->UpdateVisibilityOf(dynObj);
 }
 
+void Spell::EffectUntrainTalents(SpellEffIndex effIndex)
+{
+    if (!unitTarget || m_caster->GetTypeId() == TYPEID_PLAYER)
+        return;
+
+    if (uint64 guid = m_caster->GetGUID()) // the trainer is the caster
+        unitTarget->ToPlayer()->SendTalentWipeConfirm(guid);
+}
+
 void Spell::EffectTeleUnitsFaceCaster(SpellEffIndex effIndex)
 {
     if (!unitTarget)