using System;
using UnityEngine;
using UnityEngine.Serialization;

namespace UltimateWater
{
	public class WavesEmitter : MonoBehaviour
	{
		[SerializeField]
		[FormerlySerializedAs("water")]
		private WaveParticlesSystemGPU _Water;

		[SerializeField]
		[FormerlySerializedAs("amplitude")]
		private float _Amplitude = 0.1f;

		[SerializeField]
		[FormerlySerializedAs("wavelength")]
		private float _Wavelength = 10f;

		[SerializeField]
		[FormerlySerializedAs("lifetime")]
		private float _Lifetime = 50f;

		[SerializeField]
		[FormerlySerializedAs("speed")]
		private float _Speed = 3.5f;

		[SerializeField]
		[FormerlySerializedAs("foam")]
		private float _Foam = 1f;

		[SerializeField]
		[FormerlySerializedAs("emissionArea")]
		private float _EmissionArea = 1f;

		[SerializeField]
		[FormerlySerializedAs("emissionInterval")]
		private float _EmissionInterval = 0.15f;

		[Range(0f, 1f)]
		[SerializeField]
		[FormerlySerializedAs("trailCalming")]
		private float _TrailCalming = 1f;

		[Range(0f, 8f)]
		[SerializeField]
		[FormerlySerializedAs("trailFoam")]
		private float _TrailFoam = 1f;

		[Range(0f, 180f)]
		[SerializeField]
		[FormerlySerializedAs("emissionAngle")]
		private float _EmissionAngle;

		[Header("Advanced")]
		[SerializeField]
		[FormerlySerializedAs("minTextureU")]
		private int _MinTextureU = 4;

		[SerializeField]
		[FormerlySerializedAs("maxTextureU")]
		private int _MaxTextureU = 8;

		[Range(0f, 1f)]
		[SerializeField]
		[FormerlySerializedAs("initialPower")]
		private float _InitialPower = 1f;

		private float _Power = -1f;

		private float _LastEmitTime;

		private float _FinalEmissionInterval;

		private Water _WaterComponent;

		public float Power
		{
			get
			{
				return _Power;
			}
			set
			{
				_Power = ((value > 0f) ? value : 0f);
				_FinalEmissionInterval = _EmissionInterval / _Power;
				base.enabled = _Power != 0f;
			}
		}

		private void OnValidate()
		{
			_FinalEmissionInterval = _EmissionInterval / _Power;
		}

		private void LateUpdate()
		{
			float time = Time.time;
			if (time - _LastEmitTime >= _FinalEmissionInterval)
			{
				_LastEmitTime = time;
				Vector2 vector = GetVector2(base.transform.position);
				Vector2 normalized = GetVector2(base.transform.forward).normalized;
				Vector2 normalized2 = GetVector2(base.transform.right).normalized;
				if (normalized.x == 0f && normalized.y == 0f)
				{
					normalized = GetVector2(base.transform.up).normalized;
				}
				float num = _EmissionAngle * (MathF.PI / 180f);
				FastMath.SinCos2048(UnityEngine.Random.Range(0f - num, num), out var s, out var c);
				Vector2 vector2 = new Vector2(normalized.x * c - normalized.y * s, normalized.x * s + normalized.y * c);
				Vector2 position = vector + normalized2 * UnityEngine.Random.Range(0f - _EmissionArea, _EmissionArea);
				Vector2 horizontalDisplacementAt = _WaterComponent.GetHorizontalDisplacementAt(position.x, position.y, Time.time);
				position.x -= horizontalDisplacementAt.x;
				position.y -= horizontalDisplacementAt.y;
				_Water.EmitParticle(new WaveParticlesSystemGPU.ParticleData
				{
					Position = position,
					Direction = vector2 * (_Speed * _Power),
					Amplitude = _Amplitude * _Power,
					Wavelength = _Wavelength,
					InitialLifetime = _Lifetime * _Power,
					Lifetime = _Lifetime * _Power,
					Foam = _Foam * _Power,
					UvOffsetPack = (float)UnityEngine.Random.Range(0, _Water.FoamAtlasHeight) / (float)_Water.FoamAtlasHeight * 16f + (float)UnityEngine.Random.Range(_MinTextureU, _MaxTextureU) / (float)_Water.FoamAtlasWidth,
					TrailCalming = _TrailCalming,
					TrailFoam = _TrailFoam
				});
			}
		}

		private void Start()
		{
			if (_Water == null)
			{
				_Water = UnityEngine.Object.FindObjectOfType<WaveParticlesSystemGPU>();
			}
			_WaterComponent = _Water.GetComponent<Water>();
			Power = _InitialPower;
		}

		private static Vector2 GetVector2(Vector3 vector3)
		{
			return new Vector2(vector3.x, vector3.z);
		}
	}
}