/******************************************************************************
 * Copyright (C) Ultraleap, Inc. 2011-2021.                                   *
 *                                                                            *
 * Use subject to the terms of the Apache License 2.0 available at            *
 * http://www.apache.org/licenses/LICENSE-2.0, or another agreement           *
 * between Ultraleap and you, your company or other organization.             *
 ******************************************************************************/

using UnityEngine;

namespace Leap.Unity
{
    public class FpsLabel : MonoBehaviour
    {

        [SerializeField]
        private LeapProvider _provider;

        [SerializeField]
        private TextMesh _frameRateText;

        private SmoothedFloat _smoothedRenderFps = new SmoothedFloat();

        private void OnEnable()
        {
            if (_provider == null)
            {
                _provider = Hands.Provider;
            }

            if (_frameRateText == null)
            {
                _frameRateText = GetComponentInChildren<TextMesh>();
                if (_frameRateText == null)
                {
                    Debug.LogError("Could not enable FpsLabel because no TextMesh was specified!");
                    enabled = false;
                }
            }

            _smoothedRenderFps.delay = 0.3f;
            _smoothedRenderFps.reset = true;
        }

        private void Update()
        {
            _frameRateText.text = "";

            if (_provider != null)
            {
                Frame frame = _provider.CurrentFrame;

                if (frame != null)
                {
                    _frameRateText.text += "Data FPS:" + _provider.CurrentFrame.CurrentFramesPerSecond.ToString("f2");
                    _frameRateText.text += System.Environment.NewLine;
                }
            }

            if (Time.smoothDeltaTime > Mathf.Epsilon)
            {
                _smoothedRenderFps.Update(1.0f / Time.smoothDeltaTime, Time.deltaTime);
            }

            _frameRateText.text += "Render FPS:" + Mathf.RoundToInt(_smoothedRenderFps.value).ToString("f2");
        }
    }
}