using System;
using UnityEngine;

namespace UltimateWater
{
	public class WindWavesSpectrumOverlay
	{
		private Vector2[][] _SpectrumData;

		private Texture2D _Texture;

		private bool _TextureDirty = true;

		private readonly WindWaves _WindWaves;

		public Texture2D Texture
		{
			get
			{
				if (_TextureDirty)
				{
					ValidateTexture();
				}
				return _Texture;
			}
		}

		public event Action Cleared;

		public WindWavesSpectrumOverlay(WindWaves windWaves)
		{
			_WindWaves = windWaves;
			_SpectrumData = new Vector2[4][];
			for (int i = 0; i < 4; i++)
			{
				_SpectrumData[i] = new Vector2[windWaves.FinalResolution * windWaves.FinalResolution];
			}
		}

		public void Destroy()
		{
			_SpectrumData = null;
			this.Cleared = null;
			if (_Texture != null)
			{
				UnityEngine.Object.Destroy(_Texture);
				_Texture = null;
			}
		}

		public Vector2[] GetSpectrumDataDirect(int tileIndex)
		{
			return _SpectrumData[tileIndex];
		}

		public void Refresh()
		{
			int finalResolution = _WindWaves.FinalResolution;
			int num = finalResolution * finalResolution;
			for (int i = 0; i < 4; i++)
			{
				Vector2[] array = _SpectrumData[i];
				if (array.Length == num)
				{
					for (int j = 0; j < array.Length; j++)
					{
						array[j] = new Vector2(0f, 0f);
					}
				}
				else
				{
					_SpectrumData[i] = new Vector2[num];
				}
			}
			_TextureDirty = true;
			if (this.Cleared != null)
			{
				this.Cleared();
			}
		}

		private void ValidateTexture()
		{
			_TextureDirty = false;
			int finalResolution = _WindWaves.FinalResolution;
			int num = finalResolution << 1;
			if (_Texture != null && _Texture.width != num)
			{
				UnityEngine.Object.Destroy(_Texture);
				_Texture = null;
			}
			if (_Texture == null)
			{
				_Texture = new Texture2D(num, num, TextureFormat.RGHalf, mipChain: false, linear: true)
				{
					filterMode = FilterMode.Point
				};
			}
			for (int i = 0; i < 4; i++)
			{
				Vector2[] array = _SpectrumData[i];
				int num2 = ((i == 1 || i == 3) ? finalResolution : 0);
				int num3 = ((i == 2 || i == 3) ? finalResolution : 0);
				for (int num4 = finalResolution - 1; num4 >= 0; num4--)
				{
					for (int num5 = finalResolution - 1; num5 >= 0; num5--)
					{
						Vector2 vector = array[num4 * finalResolution + num5];
						_Texture.SetPixel(num2 + num4, num3 + num5, new Color(vector.x, vector.y, 0f, 0f));
					}
				}
			}
			_Texture.Apply(updateMipmaps: false, makeNoLongerReadable: false);
		}
	}
}