Core/Auras: Fixed enchant proc stack rules

Closes issue #5222.

--HG--
branch : trunk

src/server/game/Entities/Unit/Unit.cpp

@@ -3343,7 +3343,7 @@ void Unit::_AddAura(UnitAura * aura, Unit * caster)
     if (!aura->IsPassive() && aura->GetId() != 44413)
     {
         // find current aura from spell and change it's stackamount
-        if (Aura * foundAura = GetOwnedAura(aura->GetId(), aura->GetCasterGUID(), aura->GetCastItemGUID(), 0, aura))
+        if (Aura * foundAura = GetOwnedAura(aura->GetId(), aura->GetCasterGUID(), (sSpellMgr->GetSpellCustomAttr(aura->GetId()) & SPELL_ATTR0_CU_ENCHANT_PROC) ? aura->GetCastItemGUID() : 0, 0, aura))
         {
             if (aura->GetSpellProto()->StackAmount)
                 aura->ModStackAmount(foundAura->GetStackAmount());

src/server/game/Spells/SpellMgr.cpp

@@ -3044,6 +3044,16 @@ DiminishingReturnsType GetDiminishingReturnsGroupType(DiminishingGroup group)
     return DRTYPE_NONE;
 }
 
+bool IsPartOfSkillLine(uint32 skillId, uint32 spellId)
+{
+    SkillLineAbilityMapBounds skillBounds = sSpellMgr->GetSkillLineAbilityMapBounds(spellId);
+    for (SkillLineAbilityMap::const_iterator itr = skillBounds.first; itr != skillBounds.second; ++itr)
+        if (itr->second->skillId == skillId)
+            return true;
+
+    return false;
+}
+
 bool SpellArea::IsFitToRequirements(Player const* player, uint32 newZone, uint32 newArea) const
 {
     if (gender != GENDER_NONE)                   // not in expected gender
@@ -3156,7 +3166,7 @@ bool SpellMgr::CanAurasStack(Aura const *aura1, Aura const *aura2, bool sameCast
         if (spellId_1 == 44413)
             return true;
         if (aura1->GetCastItemGUID() && aura2->GetCastItemGUID())
-            if (aura1->GetCastItemGUID() != aura2->GetCastItemGUID() && (sSpellMgr->GetSpellCustomAttr(spellId_1) & SPELL_ATTR0_CU_ENCHANT_PROC))
+            if (aura1->GetCastItemGUID() != aura2->GetCastItemGUID() && (GetSpellCustomAttr(spellId_1) & SPELL_ATTR0_CU_ENCHANT_PROC))
                 return true;
         // same spell with same caster should not stack
         return false;
@@ -3424,17 +3434,14 @@ void SpellMgr::LoadSpellCustomAttr()
 {
     uint32 oldMSTime = getMSTime();
 
-    mSpellCustomAttr.resize(GetSpellStore()->GetNumRows());
-
+    mSpellCustomAttr.resize(GetSpellStore()->GetNumRows(), 0);  // initialize with 0 values
 
     uint32 count = 0;
 
-    SpellEntry *spellInfo;
-    for (uint32 i = 0; i < GetSpellStore()->GetNumRows(); ++i)
+    SpellEntry* spellInfo = NULL;
+    for (uint32 i = 0; i < sSpellStore.GetNumRows(); ++i)
     {
-
-        mSpellCustomAttr[i] = 0;
-        spellInfo = (SpellEntry*)GetSpellStore()->LookupEntry(i);
+        spellInfo = (SpellEntry*)sSpellStore.LookupEntry(i);
         if (!spellInfo)
             continue;
 
@@ -3470,6 +3477,36 @@ void SpellMgr::LoadSpellCustomAttr()
                         spellInfo->Effect[j] = SPELL_EFFECT_TRIGGER_MISSILE;
                     count++;
                     break;
+                case SPELL_EFFECT_ENCHANT_ITEM:
+                case SPELL_EFFECT_ENCHANT_ITEM_TEMPORARY:
+                case SPELL_EFFECT_ENCHANT_ITEM_PRISMATIC:
+                case SPELL_EFFECT_ENCHANT_HELD_ITEM:
+                {
+                    // only enchanting profession enchantments procs can stack
+                    if (IsPartOfSkillLine(SKILL_ENCHANTING, i))
+                    {
+                        uint32 enchantId = spellInfo->EffectMiscValue[j];
+                        SpellItemEnchantmentEntry const *enchant = sSpellItemEnchantmentStore.LookupEntry(enchantId);
+                        for (uint8 s = 0; s < MAX_ITEM_ENCHANTMENT_EFFECTS; ++s)
+                        {
+                            if (enchant->type[s] != ITEM_ENCHANTMENT_TYPE_COMBAT_SPELL)
+                                continue;
+
+                            SpellEntry const *procInfo = sSpellStore.LookupEntry(enchant->spellid[s]);
+                            if (!procInfo)
+                                continue;
+
+                            // if proced directly from enchantment, not via proc aura
+                            // NOTE: Enchant Weapon - Blade Ward also has proc aura spell and is proced directly
+                            // however its not expected to stack so this check is good
+                            if (IsSpellHaveAura(procInfo, SPELL_AURA_PROC_TRIGGER_SPELL))
+                                continue;
+
+                            mSpellCustomAttr[enchant->spellid[s]] |= SPELL_ATTR0_CU_ENCHANT_PROC;
+                        }
+                    }
+                    break;
+                }
             }
 
             switch (SpellTargetType[spellInfo->EffectImplicitTargetA[j]])
@@ -3981,25 +4018,6 @@ void SpellMgr::LoadSpellCustomAttr()
         }
     }
 
-    for (uint32 i = 0; i < sSpellItemEnchantmentStore.GetNumRows(); ++i)
-    {
-        SpellItemEnchantmentEntry const *enchant = sSpellItemEnchantmentStore.LookupEntry(i);
-        if (!enchant)
-            continue;
-
-        for (uint8 s = 0; s < MAX_ITEM_ENCHANTMENT_EFFECTS; ++s)
-        {
-            if (enchant->type[s] != ITEM_ENCHANTMENT_TYPE_COMBAT_SPELL)
-                continue;
-
-            SpellEntry const *spellInfo = sSpellStore.LookupEntry(enchant->spellid[s]);
-            if (!spellInfo)
-                continue;
-
-            mSpellCustomAttr[enchant->spellid[s]] |= SPELL_ATTR0_CU_ENCHANT_PROC;
-        }
-    }
-
     SummonPropertiesEntry *properties = const_cast<SummonPropertiesEntry*>(sSummonPropertiesStore.LookupEntry(121));
     properties->Type = SUMMON_TYPE_TOTEM;
     properties = const_cast<SummonPropertiesEntry*>(sSummonPropertiesStore.LookupEntry(647)); // 52893

src/server/game/Spells/SpellMgr.h

@@ -913,6 +913,8 @@ inline bool IsProfessionOrRidingSkill(uint32 skill)
     return  IsProfessionSkill(skill) || skill == SKILL_RIDING;
 }
 
+bool IsPartOfSkillLine(uint32 skillId, uint32 spellId);
+
 class SpellMgr
 {
         friend class ACE_Singleton<SpellMgr, ACE_Null_Mutex>;