private void RotateTurret(Stage stage)
        {
            float playTime  = 0.0f; // = duration
            float stageTime = 0.0f;
            float delayTime = 0.0f;

            switch (stage)
            {
            case Stage.Stage01:
                DoNothing();
                return;

            case Stage.Stage02:
                playTime  = 4.0f;
                stageTime = stageTwoDelayTIme;
                delayTime = 4.0f;
                break;

            case Stage.Stage03:
                playTime  = Random.Range(1.0f, 2.0f);
                stageTime = stageThreeDelayTime;
                delayTime = 10.0f;
                break;

            case Stage.Stage04:
                playTime  = 3.0f;
                stageTime = stageFourDelayTIme;
                delayTime = 3.0f;
                break;

            case Stage.Stage05:
                playTime  = Random.Range(1.5f, 3.0f);
                stageTime = stageFiveDelayTime;
                delayTime = 15.0f;
                break;
            }

            int          randomTurret;
            RotateTurret turret;

            for (float i = 0.0f; i < stageTime; i += delayTime)
            {
                randomTurret = Random.Range(0, 2);

                if (Data.IsEasterEgg)
                {
                    turret = (randomTurret == 1 ? silverTurret : yellowTurret);
                }
                else
                {
                    turret = (randomTurret == 1 ? angryTurret : grumpyTurret);
                }

                float _delay = calculateManager.GetRandomDelayTime(i, i + delayTime);
                turret.Shoot(playTime, _delay);
            }
        }
        private void Awake()
        {
            calculateManager = GetOrCreateManager <CalculateManager>();
            itemManager      = GetOrCreateManager <ItemManager>();

            thickTurret  = FindComponent <ThickTurret>("ThickTurret");
            randomTurret = FindComponent <RandomTurret>("RandomTurret");

            angryTurret  = FindComponent <RotateTurret>("AngryTurret");
            grumpyTurret = FindComponent <RotateTurret>("GrumpyTurret");
            silverTurret = FindComponent <RotateTurret>("SilverTurret");
            yellowTurret = FindComponent <RotateTurret>("YellowTurret");
        }