Core/Vehicles: add a way to delay the Vehicle despawn Time if its needed.

* New database table `vehicle_template` holds info for despawn delay with option to extend it in the future

sql/updates/world/master/2020_12_31_00_world.sql

@@ -0,0 +1,9 @@
+--
+-- Table structure for table `vehicle_template`
+--
+DROP TABLE IF EXISTS `vehicle_template`;
+CREATE TABLE `vehicle_template` (
+  `creatureId` int(10) unsigned NOT NULL,
+  `despawnDelayMs` int(11) NOT NULL DEFAULT '0',
+  PRIMARY KEY (`creatureId`)
+) ENGINE=MyISAM;

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

@@ -12956,7 +12956,7 @@ void Unit::_ExitVehicle(Position const* exitPosition)
 
     if (vehicle->GetBase()->HasUnitTypeMask(UNIT_MASK_MINION) && vehicle->GetBase()->GetTypeId() == TYPEID_UNIT)
         if (((Minion*)vehicle->GetBase())->GetOwner() == this)
-            vehicle->GetBase()->ToCreature()->DespawnOrUnsummon(1);
+            vehicle->GetBase()->ToCreature()->DespawnOrUnsummon(vehicle->GetDespawnDelay());
 
     if (HasUnitTypeMask(UNIT_MASK_ACCESSORY))
     {

src/server/game/Entities/Vehicle/Vehicle.cpp

@@ -885,3 +885,11 @@ void VehicleJoinEvent::Abort(uint64)
     if (Passenger->IsInWorld() && Passenger->HasUnitTypeMask(UNIT_MASK_ACCESSORY))
         Passenger->ToCreature()->DespawnOrUnsummon();
 }
+
+Milliseconds Vehicle::GetDespawnDelay()
+{
+    if (VehicleTemplate const* vehicleTemplate = sObjectMgr->GetVehicleTemplate(this))
+        return vehicleTemplate->DespawnDelay;
+
+    return 1ms;
+}

src/server/game/Entities/Vehicle/Vehicle.h

@@ -71,6 +71,8 @@ class TC_GAME_API Vehicle : public TransportBase
 
         void RemovePendingEventsForPassenger(Unit* passenger);
 
+        Milliseconds GetDespawnDelay();
+
     protected:
         friend class VehicleJoinEvent;
         uint32 UsableSeatNum;                               ///< Number of seats that match VehicleSeatEntry::UsableByPlayer, used for proper display flags

src/server/game/Entities/Vehicle/VehicleDefines.h

@@ -19,6 +19,7 @@
 #define __TRINITY_VEHICLEDEFINES_H
 
 #include "Define.h"
+#include "Duration.h"
 #include <vector>
 #include <map>
 
@@ -113,6 +114,11 @@ struct VehicleAccessory
     uint8 SummonedType;
 };
 
+struct VehicleTemplate
+{
+    Milliseconds DespawnDelay = Milliseconds::zero();
+};
+
 typedef std::vector<VehicleAccessory> VehicleAccessoryList;
 typedef std::map<ObjectGuid::LowType, VehicleAccessoryList> VehicleAccessoryContainer;
 typedef std::map<uint32, VehicleAccessoryList> VehicleAccessoryTemplateContainer;

src/server/game/Globals/ObjectMgr.cpp

@@ -3252,6 +3252,41 @@ void ObjectMgr::LoadVehicleTemplateAccessories()
     TC_LOG_INFO("server.loading", ">> Loaded %u Vehicle Template Accessories in %u ms", count, GetMSTimeDiffToNow(oldMSTime));
 }
 
+void ObjectMgr::LoadVehicleTemplate()
+{
+    uint32 oldMSTime = getMSTime();
+
+    _vehicleTemplateStore.clear();
+
+    //                                               0           1
+    QueryResult result = WorldDatabase.Query("SELECT creatureId, despawnDelayMs FROM vehicle_template");
+
+    if (!result)
+    {
+        TC_LOG_INFO("server.loading", ">> Loaded 0 vehicle template. DB table `vehicle_template` is empty.");
+        return;
+    }
+
+    do
+    {
+        Field* fields = result->Fetch();
+
+        uint32 creatureId = fields[0].GetUInt32();
+
+        if (!sObjectMgr->GetCreatureTemplate(creatureId))
+        {
+            TC_LOG_ERROR("sql.sql", "Table `vehicle_template`: Vehicle %u does not exist.", creatureId);
+            continue;
+        }
+
+        VehicleTemplate& vehicleTemplate = _vehicleTemplateStore[creatureId];
+        vehicleTemplate.DespawnDelay = Milliseconds(fields[1].GetInt32());
+
+    } while (result->NextRow());
+
+    TC_LOG_INFO("server.loading", ">> Loaded " SZFMTD " Vehicle Template entries in %u ms", _vehicleTemplateStore.size(), GetMSTimeDiffToNow(oldMSTime));
+}
+
 void ObjectMgr::LoadVehicleAccessories()
 {
     uint32 oldMSTime = getMSTime();
@@ -9991,6 +10026,11 @@ CreatureTemplate const* ObjectMgr::GetCreatureTemplate(uint32 entry) const
     return nullptr;
 }
 
+VehicleTemplate const* ObjectMgr::GetVehicleTemplate(Vehicle* veh) const
+{
+    return Trinity::Containers::MapGetValuePtr(_vehicleTemplateStore, veh->GetCreatureEntry());
+}
+
 VehicleAccessoryList const* ObjectMgr::GetVehicleAccessoryList(Vehicle* veh) const
 {
     if (Creature* cre = veh->GetBase()->ToCreature())

src/server/game/Globals/ObjectMgr.h

@@ -1189,6 +1189,7 @@ class TC_GAME_API ObjectMgr
             return nullptr;
         }
 
+        VehicleTemplate const* GetVehicleTemplate(Vehicle* veh) const;
         VehicleAccessoryList const* GetVehicleAccessoryList(Vehicle* veh) const;
 
         DungeonEncounterList const* GetDungeonEncounterList(uint32 mapId, Difficulty difficulty) const;
@@ -1292,6 +1293,7 @@ class TC_GAME_API ObjectMgr
         void LoadInstanceEncounters();
         void LoadMailLevelRewards();
         void LoadVehicleTemplateAccessories();
+        void LoadVehicleTemplate();
         void LoadVehicleAccessories();
 
         void LoadNPCText();
@@ -1749,6 +1751,7 @@ class TC_GAME_API ObjectMgr
 
         SpellScriptsContainer _spellScriptsStore;
 
+        std::unordered_map<uint32, VehicleTemplate> _vehicleTemplateStore;
         VehicleAccessoryTemplateContainer _vehicleTemplateAccessoryStore;
         VehicleAccessoryContainer _vehicleAccessoryStore;
 

src/server/game/World/World.cpp

@@ -1940,6 +1940,9 @@ void World::SetInitialWorldSettings()
     TC_LOG_INFO("server.loading", "Loading UNIT_NPC_FLAG_SPELLCLICK Data..."); // must be after LoadQuests
     sObjectMgr->LoadNPCSpellClickSpells();
 
+    TC_LOG_INFO("server.loading", "Loading Vehicle Templates...");
+    sObjectMgr->LoadVehicleTemplate();                          // must be after LoadCreatureTemplates()
+
     TC_LOG_INFO("server.loading", "Loading Vehicle Template Accessories...");
     sObjectMgr->LoadVehicleTemplateAccessories();                // must be after LoadCreatureTemplates() and LoadNPCSpellClickSpells()