feat(Core/Wintergrasp): optional Essence buff for both factions (azerothcore#26017)

Author: Nyeriah

src/server/apps/worldserver/worldserver.conf.dist

@@ -3688,6 +3688,18 @@ Wintergrasp.SkipBattleSessionCount = 3500
 
 Wintergrasp.KickVoAPlayers = 1
 
+#
+#     Wintergrasp.EssenceBothFactions
+#         Description: Grant the "Essence of Wintergrasp" buff to both factions
+#                      during peacetime, regardless of who controls the keep.
+#                      The wartime suppression still applies; this only affects
+#                      who receives the buff once the battle is over.
+#         Default:     0 - (Disabled, only the defending faction gets the buff)
+#                      1 - (Enabled, attackers and defenders both get the buff,
+#                           so both factions can access Vault of Archavon)
+
+Wintergrasp.EssenceBothFactions = 0
+
 #
 ###################################################################################################
 

src/server/game/Battlefield/Zones/BattlefieldWG.cpp

@@ -479,12 +479,17 @@ void BattlefieldWG::OnBattleEnd(bool endByTimer)
         }
     }
 
+    bool const grantEssenceToAttackers = sWorld->getBoolConfig(CONFIG_WINTERGRASP_ESSENCE_BOTH_FACTIONS);
+
     for (ObjectGuid const& guid : PlayersInWar[GetAttackerTeam()])
         if (Player* player = ObjectAccessor::FindPlayer(guid))
         {
             player->CastSpell(player, SPELL_DEFEAT_REWARD, true);
             RemoveAurasFromPlayer(player);
 
+            if (grantEssenceToAttackers)
+                player->CastSpell(player, SPELL_ESSENCE_OF_WINTERGRASP, true);
+
             for (uint8 i = 0; i < damagedTowersAtt; ++i)
                 player->CastSpell(player, spellDamagedAtt, true);
             for (uint8 i = 0; i < brokenTowersAtt; ++i)

src/server/game/Spells/SpellMgr.cpp

@@ -1101,7 +1101,9 @@ bool SpellArea::IsFitToRequirements(Player const* player, uint32 newZone, uint32
                     return false;
 
                 Battlefield* Bf = sBattlefieldMgr->GetBattlefieldByBattleId(BATTLEFIELD_BATTLEID_WG);
-                if (!Bf || player->GetTeamId() != Bf->GetDefenderTeam() || Bf->IsWarTime())
+                if (!Bf || Bf->IsWarTime())
+                    return false;
+                if (!sWorld->getBoolConfig(CONFIG_WINTERGRASP_ESSENCE_BOTH_FACTIONS) && player->GetTeamId() != Bf->GetDefenderTeam())
                     return false;
                 break;
             }

src/server/game/World/WorldConfig.cpp

@@ -596,6 +596,7 @@ void WorldConfig::BuildConfigCache()
 
     SetConfigValue<uint32>(CONFIG_WINTERGRASP_SKIP_BATTLE_SESSION_COUNT, "Wintergrasp.SkipBattleSessionCount", 3500);
     SetConfigValue<bool>(CONFIG_WINTERGRASP_KICK_VOA_PLAYERS, "Wintergrasp.KickVoAPlayers", true, ConfigValueCache::Reloadable::No);
+    SetConfigValue<bool>(CONFIG_WINTERGRASP_ESSENCE_BOTH_FACTIONS, "Wintergrasp.EssenceBothFactions", false);
 
     SetConfigValue<uint32>(CONFIG_BIRTHDAY_TIME, "BirthdayTime", 1222964635);
     SetConfigValue<bool>(CONFIG_MINIGOB_MANABONK, "Minigob.Manabonk.Enable", true);

src/server/game/World/WorldConfig.h

@@ -327,6 +327,7 @@ enum ServerConfigs
     CONFIG_WINTERGRASP_RESTART_AFTER_CRASH,
     CONFIG_WINTERGRASP_SKIP_BATTLE_SESSION_COUNT,
     CONFIG_WINTERGRASP_KICK_VOA_PLAYERS,
+    CONFIG_WINTERGRASP_ESSENCE_BOTH_FACTIONS,
     CONFIG_PACKET_SPOOF_BANMODE,
     CONFIG_PACKET_SPOOF_BANDURATION,
     CONFIG_WARDEN_CLIENT_RESPONSE_DELAY,