using System;
using UnityEngine;

namespace SplineMesh
{
	[DisallowMultipleComponent]
	[ExecuteInEditMode]
	[RequireComponent(typeof(Spline))]
	public class SplineSmoother : MonoBehaviour
	{
		private Spline spline;

		[Range(0f, 1f)]
		public float curvature = 0.3f;

		private Spline Spline
		{
			get
			{
				if (spline == null)
				{
					spline = GetComponent<Spline>();
				}
				return spline;
			}
		}

		private void OnValidate()
		{
			SmoothAll();
		}

		private void OnEnable()
		{
			Spline.NodeListChanged += Spline_NodeListChanged;
			foreach (SplineNode node in Spline.nodes)
			{
				node.Changed += OnNodeChanged;
			}
			SmoothAll();
		}

		private void OnDisable()
		{
			Spline.NodeListChanged -= Spline_NodeListChanged;
			foreach (SplineNode node in Spline.nodes)
			{
				node.Changed -= OnNodeChanged;
			}
		}

		private void Spline_NodeListChanged(object sender, ListChangedEventArgs<SplineNode> args)
		{
			if (args.newItems != null)
			{
				foreach (SplineNode newItem in args.newItems)
				{
					newItem.Changed += OnNodeChanged;
				}
			}
			if (args.removedItems == null)
			{
				return;
			}
			foreach (SplineNode removedItem in args.removedItems)
			{
				removedItem.Changed -= OnNodeChanged;
			}
		}

		private void OnNodeChanged(object sender, EventArgs e)
		{
			SplineNode splineNode = (SplineNode)sender;
			SmoothNode(splineNode);
			int num = Spline.nodes.IndexOf(splineNode);
			if (num > 0)
			{
				SmoothNode(Spline.nodes[num - 1]);
			}
			if (num < Spline.nodes.Count - 1)
			{
				SmoothNode(Spline.nodes[num + 1]);
			}
		}

		private void SmoothNode(SplineNode node)
		{
			int num = Spline.nodes.IndexOf(node);
			Vector3 position = node.Position;
			Vector3 zero = Vector3.zero;
			float num2 = 0f;
			if (num != 0)
			{
				Vector3 position2 = Spline.nodes[num - 1].Position;
				Vector3 vector = position - position2;
				num2 += vector.magnitude;
				zero += vector.normalized;
			}
			if (num != Spline.nodes.Count - 1)
			{
				Vector3 position3 = Spline.nodes[num + 1].Position;
				Vector3 vector2 = position - position3;
				num2 += vector2.magnitude;
				zero -= vector2.normalized;
			}
			num2 *= 0.5f;
			zero = zero.normalized * num2 * curvature;
			Vector3 direction = zero + position;
			node.Direction = direction;
		}

		private void SmoothAll()
		{
			foreach (SplineNode node in Spline.nodes)
			{
				SmoothNode(node);
			}
		}
	}
}