Core/Vehicle: Change vehicle accessories' phase according to the player on the vehicle (#23646)

* Core/Vehicle: Change vehicle accessories' phase according to the player on the vehicle

* Get the root vehicle to set the phase to all accessories.
Attempt to get the accessories to stay mounted on the vehicle.

* Fix the accessories to stay mounted on the vehicle

2 files changed, 20 insertions, 3 deletions

diff --git a/src/server/game/Entities/Unit/Unit.cpp b/src/server/game/Entities/Unit/Unit.cpp
index 07c3b35de1a..7fae69d54f0 100644
--- a/src/server/game/Entities/Unit/Unit.cpp
+++ b/src/server/game/Entities/Unit/Unit.cpp
@@ -11657,6 +11657,22 @@ Unit* Unit::GetVehicleBase() const
     return m_vehicle ? m_vehicle->GetBase() : nullptr;
 }
 
+Unit* Unit::GetVehicleRoot() const
+{
+    Unit* vehicleRoot = GetVehicleBase();
+
+    if (!vehicleRoot)
+        return nullptr;
+
+    for (;;)
+    {
+        if (!vehicleRoot->GetVehicleBase())
+            return vehicleRoot;
+
+        vehicleRoot = vehicleRoot->GetVehicleBase();
+    }
+}
+
 Creature* Unit::GetVehicleCreatureBase() const
 {
     if (Unit* veh = GetVehicleBase())
diff --git a/src/server/game/Entities/Unit/Unit.h b/src/server/game/Entities/Unit/Unit.h
index f92c80c9b55..1de18af19b7 100644
--- a/src/server/game/Entities/Unit/Unit.h
+++ b/src/server/game/Entities/Unit/Unit.h
@@ -1593,11 +1593,12 @@ class TC_GAME_API Unit : public WorldObject
         ObjectGuid LastCharmerGUID;
         bool CreateVehicleKit(uint32 id, uint32 creatureEntry);
         void RemoveVehicleKit();
-        Vehicle* GetVehicleKit()const { return m_vehicleKit; }
-        Vehicle* GetVehicle()   const { return m_vehicle; }
+        Vehicle* GetVehicleKit() const { return m_vehicleKit; }
+        Vehicle* GetVehicle() const { return m_vehicle; }
         void SetVehicle(Vehicle* vehicle) { m_vehicle = vehicle; }
         bool IsOnVehicle(Unit const* vehicle) const;
-        Unit* GetVehicleBase()  const;
+        Unit* GetVehicleBase() const;
+        Unit* GetVehicleRoot() const;
         Creature* GetVehicleCreatureBase() const;
         ObjectGuid GetTransGUID()   const override;
         /// Returns the transport this unit is on directly (if on vehicle and transport, return vehicle)