CrestTimeProvider.cs

using System.Diagnostics;
using UnityEngine;

namespace Crest
{
    [System.Serializable]
    public class CrestTimeProvider
    {
        private const float MaxDifferenceBeforeAdjust = 0.5f;

        [SerializeField]
        private bool UseNetworkTime;
        [SerializeField]
        private bool HasNetworkTime;
        [SerializeField]
        private float CurrentWaterTime;
        [SerializeField]
        private float NetworkTime;
        private Stopwatch Stopwatch;

        public CrestTimeProvider(bool useNetworkTime)
        {
            UseNetworkTime = useNetworkTime;
        }

        public void SetNetworkTime(float networkTime)
        {
            NetworkTime = networkTime;
            HasNetworkTime = true;
        }

        public float GetWaterTime()
        {
            // Prevents the water getting set to local time when using network time, which would result in speed waves as the system lerps from local to network.
            if (UseNetworkTime && !HasNetworkTime)
            {
                return 0f;
            }

            if (NetworkTime == 0f)
            {
                NetworkTime = LocalNetworkTime();
            }
            
            if (CurrentWaterTime == 0f)
            {
                CurrentWaterTime = NetworkTime;
            }
            else
            {
                CurrentWaterTime += Time.deltaTime;
            }

            if (UseNetworkTime)
            {
                float diff = Mathf.Abs(CurrentWaterTime - NetworkTime);
                if (diff >= MaxDifferenceBeforeAdjust)
                {
                    CurrentWaterTime = Mathf.Lerp(CurrentWaterTime, NetworkTime, Time.deltaTime);
                }
            }
            

            return CurrentWaterTime;
        }


        // Serves as a local time source when in single player mode, and as the time source for the server to send to clients.
        public float LocalNetworkTime()
        {
            if (Stopwatch == null)
            {
                Stopwatch = Stopwatch.StartNew();
            }

            return Stopwatch.ElapsedMilliseconds / 1000f;
        }
    }
}