using UnityEngine;

namespace UltimateWater.Internal
{
	public class WaterTileSpectrum
	{
		public readonly Water Water;

		public readonly WindWaves WindWaves;

		public readonly int TileIndex;

		public Vector2[] DirectionalSpectrum;

		public Vector2[][] Displacements;

		public Vector4[][] ForceAndHeight;

		public float[] ResultsTiming;

		public int RecentResultIndex;

		public bool ResolveByFFT;

		public int DirectionalSpectrumDirty;

		private int _ResolutionFFT;

		private int _MipIndexFFT;

		private float _CachedTime = float.NegativeInfinity;

		private float _CachedTimeProp;

		private Vector2[] _CachedDisplacementsA;

		private Vector2[] _CachedDisplacementsB;

		private Vector4[] _CachedForceAndHeightA;

		private Vector4[] _CachedForceAndHeightB;

		public bool IsResolvedByFFT => ResolveByFFT;

		public int ResolutionFFT => _ResolutionFFT;

		public int MipIndexFFT => _MipIndexFFT;

		public void SetDirty()
		{
			DirectionalSpectrumDirty = 2;
		}

		public bool SetResolveMode(bool resolveByFFT, int resolution)
		{
			if (ResolveByFFT != resolveByFFT || (ResolveByFFT && _ResolutionFFT != resolution))
			{
				if (resolveByFFT)
				{
					lock (this)
					{
						int num = ((WindWaves.LoopDuration != 0f) ? ((int)(WindWaves.LoopDuration * 5f + 0.6f)) : 4);
						_ResolutionFFT = resolution;
						_MipIndexFFT = WaterWavesSpectrumDataBase.GetMipIndex(resolution);
						int num2 = resolution * resolution;
						DirectionalSpectrum = new Vector2[num2];
						Displacements = new Vector2[num][];
						ForceAndHeight = new Vector4[num][];
						ResultsTiming = new float[num];
						SetDirty();
						_CachedTime = float.NegativeInfinity;
						for (int i = 0; i < num; i++)
						{
							Displacements[i] = new Vector2[num2];
							ForceAndHeight[i] = new Vector4[num2];
						}
						if (!ResolveByFFT)
						{
							WaterAsynchronousTasks.Instance.AddFFTComputations(this);
							ResolveByFFT = true;
						}
					}
				}
				else
				{
					WaterAsynchronousTasks.Instance.RemoveFFTComputations(this);
					ResolveByFFT = false;
				}
				return true;
			}
			return false;
		}

		public void GetResults(float time, out Vector2[] da, out Vector2[] db, out Vector4[] fa, out Vector4[] fb, out float p)
		{
			if (WindWaves.LoopDuration != 0f)
			{
				time %= WindWaves.LoopDuration;
			}
			lock (this)
			{
				if (time == _CachedTime)
				{
					da = _CachedDisplacementsA;
					db = _CachedDisplacementsB;
					fa = _CachedForceAndHeightA;
					fb = _CachedForceAndHeightB;
					p = _CachedTimeProp;
					return;
				}
				int recentResultIndex = RecentResultIndex;
				for (int num = recentResultIndex - 1; num >= 0; num--)
				{
					if (ResultsTiming[num] <= time)
					{
						int num2 = num + 1;
						da = Displacements[num];
						db = Displacements[num2];
						fa = ForceAndHeight[num];
						fb = ForceAndHeight[num2];
						float num3 = ResultsTiming[num2] - ResultsTiming[num];
						if (num3 != 0f)
						{
							p = (time - ResultsTiming[num]) / num3;
						}
						else
						{
							p = 0f;
						}
						if (time > _CachedTime)
						{
							_CachedDisplacementsA = da;
							_CachedDisplacementsB = db;
							_CachedForceAndHeightA = fa;
							_CachedForceAndHeightB = fb;
							_CachedTimeProp = p;
							_CachedTime = time;
						}
						return;
					}
				}
				for (int num4 = ResultsTiming.Length - 1; num4 > recentResultIndex; num4--)
				{
					if (ResultsTiming[num4] <= time)
					{
						int num5 = ((num4 != Displacements.Length - 1) ? (num4 + 1) : 0);
						da = Displacements[num4];
						db = Displacements[num5];
						fa = ForceAndHeight[num4];
						fb = ForceAndHeight[num5];
						float num6 = ResultsTiming[num5] - ResultsTiming[num4];
						if (num6 != 0f)
						{
							p = (time - ResultsTiming[num4]) / num6;
						}
						else
						{
							p = 0f;
						}
						return;
					}
				}
				da = Displacements[recentResultIndex];
				db = Displacements[recentResultIndex];
				fa = ForceAndHeight[recentResultIndex];
				fb = ForceAndHeight[recentResultIndex];
				p = 0f;
			}
		}

		public WaterTileSpectrum(Water water, WindWaves windWaves, int index)
		{
			Water = water;
			WindWaves = windWaves;
			TileIndex = index;
		}
	}
}