fix(Core/Spells): Implemented ENCHANT_PROC_ATTR_EXCLUSIVE. (#15476)

Fixes #12132

data/sql/updates/pending_db_world/rev_1679233071443044800.sql

@@ -0,0 +1,3 @@
+--
+ALTER TABLE `spell_enchant_proc_data` ADD COLUMN `attributeMask` INT UNSIGNED DEFAULT 0 NOT NULL AFTER `procEx`;
+UPDATE `spell_enchant_proc_data` SET `attributeMask`=1 WHERE `entry`=3225;

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

@@ -7218,6 +7218,15 @@ void Player::CastItemCombatSpell(Unit* target, WeaponAttackType attType, uint32
                 continue;
             }
 
+            if (entry && (entry->attributeMask & ENCHANT_PROC_ATTR_EXCLUSIVE) != 0)
+            {
+                Unit* checkTarget = spellInfo->IsPositive() ? this : target;
+                if (checkTarget->HasAura(spellInfo->Id, GetGUID()))
+                {
+                    continue;
+                }
+            }
+
             float chance = pEnchant->amount[s] != 0 ? float(pEnchant->amount[s]) : GetWeaponProcChance();
 
             if (entry)

src/server/game/Spells/SpellMgr.cpp

@@ -2211,8 +2211,8 @@ void SpellMgr::LoadSpellEnchantProcData()
 
     mSpellEnchantProcEventMap.clear();                             // need for reload case
 
-    //                                                  0         1           2         3
+    //                                                  0         1           2         3          4
-    QueryResult result = WorldDatabase.Query("SELECT entry, customChance, PPMChance, procEx FROM spell_enchant_proc_data");
+    QueryResult result = WorldDatabase.Query("SELECT entry, customChance, PPMChance, procEx, attributeMask FROM spell_enchant_proc_data");
     if (!result)
     {
         LOG_WARN("server.loading", ">> Loaded 0 spell enchant proc event conditions. DB table `spell_enchant_proc_data` is empty.");
@@ -2239,6 +2239,7 @@ void SpellMgr::LoadSpellEnchantProcData()
         spe.customChance = fields[1].Get<uint32>();
         spe.PPMChance = fields[2].Get<float>();
         spe.procEx = fields[3].Get<uint32>();
+        spe.attributeMask = fields[4].Get<uint32>();
 
         mSpellEnchantProcEventMap[enchantId] = spe;
 

src/server/game/Spells/SpellMgr.h

@@ -304,11 +304,17 @@ struct SpellProcEntry
 
 typedef std::unordered_map<uint32, SpellProcEntry> SpellProcMap;
 
+enum EnchantProcAttributes
+{
+    ENCHANT_PROC_ATTR_EXCLUSIVE     = 0x1 // Only one instance of that effect can be active
+};
+
 struct SpellEnchantProcEntry
 {
     uint32      customChance;
     float       PPMChance;
     uint32      procEx;
+    uint32      attributeMask;
 };
 
 typedef std::unordered_map<uint32, SpellEnchantProcEntry> SpellEnchantProcEventMap;