/************************************************************************************
Copyright : Copyright (c) Facebook Technologies, LLC and its affiliates. All rights reserved.

Your use of this SDK or tool is subject to the Oculus SDK License Agreement, available at
https://developer.oculus.com/licenses/oculussdk/

Unless required by applicable law or agreed to in writing, the Utilities SDK 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;
using UnityEngine.Assertions;

namespace Oculus.Interaction
{
    [ExecuteAlways]
    public class DotGridProperties : MonoBehaviour
    {
        [SerializeField]
        private MaterialPropertyBlockEditor _materialPropertyBlockEditor;

        [SerializeField]
        private int _columns;

        [SerializeField]
        private int _rows;

        [SerializeField]
        private float _radius;

        [SerializeField]
        private Color _color;

        public int Columns
        {
            get
            {
                return _columns;
            }
            set
            {
                _columns = value;
            }
        }

        public int Rows
        {
            get
            {
                return _rows;
            }
            set
            {
                _rows = value;
            }
        }

        public float Radius
        {
            get
            {
                return _radius;
            }
            set
            {
                _radius = value;
            }
        }

        public Color Color
        {
            get
            {
                return _color;
            }
            set
            {
                _color = value;
            }
        }

        private bool _change = false;
        private readonly int _colorShaderID = Shader.PropertyToID("_Color");
        private readonly int _dimensionsShaderID = Shader.PropertyToID("_Dimensions");

        protected virtual void Start()
        {
            Assert.IsNotNull(_materialPropertyBlockEditor);
            _change = true;
        }

        protected virtual void Update()
        {
            if (!_change || _materialPropertyBlockEditor == null)
            {
                return;
            }

            MaterialPropertyBlock block = _materialPropertyBlockEditor.MaterialPropertyBlock;
            block.SetColor(_colorShaderID, _color);
            block.SetVector(_dimensionsShaderID, new Vector4((float)_columns, (float)_rows, _radius, 0));
            _materialPropertyBlockEditor.UpdateMaterialPropertyBlock();

            _change = false;
        }

        protected virtual void OnValidate()
        {
            _change = true;
        }

        #region Inject

        public void InjectAllDotGridProperties(MaterialPropertyBlockEditor editor)
        {
            InjectMaterialPropertyBlockEditor(editor);
        }

        public void InjectMaterialPropertyBlockEditor(MaterialPropertyBlockEditor editor)
        {
            _materialPropertyBlockEditor = editor;
        }

        #endregion
    }
}