using UnityEngine;

namespace Artngame.TEM
{
	public class TornadoDustTop : MonoBehaviour
	{
		public GameObject groundPSObj;

		public GameObject debugCylinder;

		public float rotationSpeed = 10f;

		public float bottomRadius = 15f;

		public float topRadius = 50f;

		public float height = 40f;

		public float tornadoHeight;

		public AnimationCurve dustShape;

		private ParticleSystem groundPS;

		private ParticleSystem.Particle[] m_Particles;

		private Vector3 oldCenterPos;

		private void Start()
		{
			groundPS = groundPSObj.GetComponent<ParticleSystem>();
			m_Particles = new ParticleSystem.Particle[groundPS.main.maxParticles];
			oldCenterPos = base.transform.position;
		}

		private void LateUpdate()
		{
			ParticleSystem.ShapeModule shape = groundPS.shape;
			shape.radius = bottomRadius;
			debugCylinder.transform.localScale = new Vector3(bottomRadius * 2f, 1f, bottomRadius * 2f);
			RotateParticles();
			oldCenterPos = base.transform.position;
		}

		private void RotateParticles()
		{
			int particles = groundPS.GetParticles(m_Particles);
			for (int i = 0; i < particles; i++)
			{
				Vector3 position = m_Particles[i].position;
				float y = position.y;
				if (y > height + tornadoHeight + 20f)
				{
					m_Particles[i].remainingLifetime = -1f;
					continue;
				}
				if (y > height + tornadoHeight)
				{
					Color32 startColor = m_Particles[i].startColor;
					startColor.a = 150;
					m_Particles[i].startColor = startColor;
				}
				Vector3 position2 = base.transform.position;
				Vector3 vector = position2 - oldCenterPos;
				position += vector;
				float num = dustShape.Evaluate((y - tornadoHeight) / height) * (topRadius - bottomRadius) + bottomRadius;
				position = TornadoMath.CheckRadius(position, position2, num);
				Vector3 vector2 = position - position2;
				float angle = TornadoMath.GetAngle(vector2.x, vector2.z);
				float num2 = (1f - dustShape.Evaluate((y - tornadoHeight) / height)) * rotationSpeed;
				position = TornadoMath.GetParticlePos(position2, angle, num, num2);
				position.y = y;
				m_Particles[i].position = position;
				m_Particles[i].startSize = 150f * dustShape.Evaluate((y - tornadoHeight) / height) + 45f;
			}
			groundPS.SetParticles(m_Particles, particles);
		}
	}
}