/*
 * 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 System;
using UnityEngine;

namespace Oculus.Interaction
{
    public abstract class PointerInteractable<TInteractor, TInteractable> : Interactable<TInteractor, TInteractable>,
        IPointable
        where TInteractor : Interactor<TInteractor, TInteractable>
        where TInteractable : PointerInteractable<TInteractor, TInteractable>
    {
        [SerializeField, Interface(typeof(IPointableElement))]
        [Optional(OptionalAttribute.Flag.DontHide)]
        private UnityEngine.Object _pointableElement;
        public IPointableElement PointableElement { get; protected set; }

        public event Action<PointerEvent> WhenPointerEventRaised = delegate { };

        public void PublishPointerEvent(PointerEvent evt)
        {
            WhenPointerEventRaised(evt);
        }

        protected override void Awake()
        {
            base.Awake();
            PointableElement = _pointableElement as IPointableElement;
        }

        protected override void Start()
        {
            this.BeginStart(ref _started, () => base.Start());
            if (_pointableElement != null)
            {
                this.AssertField(PointableElement, nameof(PointableElement));
            }
            this.EndStart(ref _started);
        }

        protected override void OnEnable()
        {
            base.OnEnable();
            if (_started)
            {
                if (PointableElement != null)
                {
                    WhenPointerEventRaised += PointableElement.ProcessPointerEvent;
                }
            }
        }

        protected override void OnDisable()
        {
            if (_started)
            {
                if (PointableElement != null)
                {
                    WhenPointerEventRaised -= PointableElement.ProcessPointerEvent;
                }
            }
            base.OnDisable();
        }

        #region Inject

        public void InjectOptionalPointableElement(IPointableElement pointableElement)
        {
            PointableElement = pointableElement;
            _pointableElement = pointableElement as UnityEngine.Object;
        }

        #endregion
    }
}
