/*
 * 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 UnityEngine.Assertions;

namespace Oculus.Interaction.Samples
{
    public class LookAtTarget : MonoBehaviour
    {
        [SerializeField]
        private Transform _toRotate;

        [SerializeField]
        private Transform _target;

        protected virtual void Start()
        {
            this.AssertField(_toRotate, nameof(_toRotate));
            this.AssertField(_target, nameof(_target));
        }

        protected virtual void Update()
        {
            Vector3 dirToTarget = (_target.position - _toRotate.position).normalized;
            _toRotate.LookAt(_toRotate.position - dirToTarget, Vector3.up);
        }
    }
}