건물 업그레이드 기능

Assets/Scripts/BuildingManager.cs

@@ -296,6 +296,17 @@ namespace Northbound
             }
         }
 
+        /// <summary>
+        /// 토대 등록 (업그레이드 등으로 생성된 토대)
+        /// </summary>
+        public void RegisterFoundation(BuildingFoundation foundation)
+        {
+            if (!placedFoundations.Contains(foundation))
+            {
+                placedFoundations.Add(foundation);
+            }
+        }
+
         /// <summary>
         /// 사전 배치 건물 등록 (씬에 미리 있는 건물용)
         /// </summary>
@@ -516,5 +527,91 @@ namespace Northbound
                 Destroy(buildingObj);
             }
         }
+
+        #region Upgrade System
+
+        /// <summary>
+        /// ID로 TowerData 찾기
+        /// </summary>
+        public TowerData GetTowerDataById(int towerId)
+        {
+            foreach (var data in availableBuildings)
+            {
+                if (data != null && data.id == towerId)
+                {
+                    return data;
+                }
+            }
+            return null;
+        }
+
+        /// <summary>
+        /// 건물 업그레이드 (서버에서만 호출)
+        /// </summary>
+        public void UpgradeBuilding(Building building, TowerData upgradeData)
+        {
+            if (!IsServer) return;
+            if (building == null || upgradeData == null) return;
+            if (upgradeData.prefab == null)
+            {
+                Debug.LogError($"[BuildingManager] 업그레이드 프리팹이 없습니다: {upgradeData.buildingName}");
+                return;
+            }
+
+            // 기존 건물 정보 저장
+            Vector3Int gridPos = building.gridPosition;
+            int rotation = building.rotation;
+            ulong ownerId = building.GetOwnerId();
+            TeamType team = building.GetTeam();
+
+            // 기존 건물 제거
+            placedBuildings.Remove(building);
+
+            // FogOfWar 시스템에서 제거
+            if (building.buildingData != null && building.buildingData.providesVision)
+            {
+                FogOfWarSystem.Instance?.UnregisterVisionProvider(building);
+            }
+
+            // 기존 건물 파괴
+            building.NetworkObject.Despawn(true);
+
+            // 새 건물 생성
+            Vector3 worldPosition = GridToWorld(gridPos);
+            GameObject newBuildingObj = Instantiate(upgradeData.prefab, worldPosition + upgradeData.placementOffset, Quaternion.Euler(0, rotation * 90f, 0));
+            NetworkObject netObj = newBuildingObj.GetComponent<NetworkObject>();
+
+            // FogOfWarVisibility 추가
+            if (newBuildingObj.GetComponent<FogOfWarVisibility>() == null)
+            {
+                var visibility = newBuildingObj.AddComponent<FogOfWarVisibility>();
+                visibility.showInExploredAreas = true;
+                visibility.updateInterval = 0.2f;
+            }
+
+            if (netObj != null)
+            {
+                netObj.SpawnWithOwnership(ownerId);
+
+                Building newBuilding = newBuildingObj.GetComponent<Building>();
+                if (newBuilding == null)
+                {
+                    newBuilding = newBuildingObj.AddComponent<Building>();
+                }
+
+                // 새 건물 초기화
+                newBuilding.Initialize(upgradeData, gridPos, rotation, ownerId, team);
+                placedBuildings.Add(newBuilding);
+
+                Debug.Log($"<color=green>[BuildingManager] 건물 업그레이드 완료: {upgradeData.buildingName}</color>");
+            }
+            else
+            {
+                Debug.LogError($"<color=red>[BuildingManager] 업그레이드 프리팹에 NetworkObject가 없습니다!</color>");
+                Destroy(newBuildingObj);
+            }
+        }
+
+        #endregion
     }
 }