/*
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 * All rights reserved.
 *
 * Licensed under the Oculus SDK License Agreement (the "License");
 * you may not use the Oculus SDK except in compliance with the License,
 * which is provided at the time of installation or download, or which
 * otherwise accompanies this software in either electronic or hard copy form.
 *
 * You may obtain a copy of the License at
 *
 * https://developer.oculus.com/licenses/oculussdk/
 *
 * Unless required by applicable law or agreed to in writing, the Oculus 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 Oculus.Interaction.UnityCanvas;
using UnityEngine.Serialization;

namespace Oculus.Interaction
{
    /// <summary>
    /// Remaps Pointable events on the surface of a <see cref="CanvasMesh"/> to Pointable events
    /// on the underlying <see cref="Canvas"/>. This should be used to forward Pointable events
    /// to a <see cref="PointableCanvas"/> when using Curved Canvases.
    /// </summary>
    public class PointableCanvasMesh : PointableElement
    {
        /// <summary>
        /// This CanvasMesh determines the Pose of PointerEvents.
        /// </summary>
        [Tooltip("This CanvasMesh determines the Pose of PointerEvents.")]
        [SerializeField]
        [FormerlySerializedAs("_canvasRenderTextureMesh")]
        private CanvasMesh _canvasMesh;

        protected override void Start()
        {
            base.Start();
            this.AssertField(_canvasMesh, nameof(_canvasMesh));
        }

        /// <summary>
        /// Implementation of <see cref="IPointableElement.ProcessPointerEvent(PointerEvent)"/>;
        /// for details, please refer to the related documentation provided for that interface.
        /// </summary>
        public override void ProcessPointerEvent(PointerEvent evt)
        {
            Vector3 transformPosition =
                _canvasMesh.ImposterToCanvasTransformPoint(evt.Pose.position);
            Pose transformedPose = new Pose(transformPosition, evt.Pose.rotation);
            base.ProcessPointerEvent(new PointerEvent(evt.Identifier, evt.Type, transformedPose, evt.Data));
        }

        #region Inject

        /// <summary>
        /// Injects all required dependencies for a dynamically instantiated
        /// <see cref="PointableCanvasMesh"/>.
        /// This method exists to support Interaction SDK's dependency injection pattern and is not
        /// needed for typical Unity Editor-based usage.
        /// </summary>
        public void InjectAllCanvasMeshPointable(CanvasMesh canvasMesh)
        {
            InjectCanvasMesh(canvasMesh);
        }

        /// <summary>
        /// Sets the underlying <see cref="CanvasMesh"/> for a dynamically instantiated
        /// <see cref="PointableCanvasMesh"/>.
        /// This method exists to support Interaction SDK's dependency injection pattern and is not
        /// needed for typical Unity Editor-based usage.
        /// </summary>
        public void InjectCanvasMesh(CanvasMesh canvasMesh)
        {
            _canvasMesh = canvasMesh;
        }

        #endregion
    }
}