/*=========================================================================

   Library: iMSTK-Unity

   Copyright (c) Kitware, Inc. 

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

      http://www.apache.org/licenses/LICENSE-2.0.txt

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.

=========================================================================*/

using UnityEngine;

namespace ImstkUnity
{

    /// <summary>
    /// Simple controller for grasping, using a tracking device
    /// </summary>
    [RequireComponent(typeof(GraspingManager))]
    public class SimpleGraspingController : MonoBehaviour
    {
        public TrackingDevice device;
        // Start is called before the first frame update
        GraspingManager _manager;

        bool _isGrasping = false;

        void Start()
        {
            _manager = GetComponent<GraspingManager>();
            Debug.Assert(_manager != null);
        }

        // Update is called once per frame
        void Update()
        {
            bool doGrasp = device.IsButtonDown(0) || device.IsButtonDown(1);
            if (doGrasp && !_isGrasping)
            {
                Debug.Log("Grasping");
                _manager.StartGrasp();
                _isGrasping = true;
            }
            else if (!doGrasp && _isGrasping)
            {
                Debug.Log("Releasing");
                _manager.EndGrasp();
                _isGrasping = false;
            }
        }
    }
}