using System;
using UnityEngine;

namespace SplineMesh
{
	[ExecuteInEditMode]
	[SelectionBase]
	[DisallowMultipleComponent]
	public class PrefabPlacer : MonoBehaviour
	{
		private GameObject generated;

		private Spline spline;

		private bool toUpdate = true;

		public GameObject prefab;

		public float scale = 1f;

		public float scaleRange;

		public float spacing = 1f;

		public float spacingRange;

		public float offset;

		public float offsetRange;

		public bool isRandomYaw;

		public int randomSeed;

		private void OnEnable()
		{
			string n = "generated by " + GetType().Name;
			Transform transform = base.transform.Find(n);
			generated = ((transform != null) ? transform.gameObject : UOUtility.Create(n, base.gameObject));
			spline = GetComponentInParent<Spline>();
			spline.NodeListChanged += delegate
			{
				toUpdate = true;
				foreach (CubicBezierCurve curf in spline.GetCurves())
				{
					curf.Changed.AddListener(delegate
					{
						toUpdate = true;
					});
				}
			};
			foreach (CubicBezierCurve curf2 in spline.GetCurves())
			{
				curf2.Changed.AddListener(delegate
				{
					toUpdate = true;
				});
			}
		}

		private void OnValidate()
		{
			toUpdate = true;
		}

		private void Update()
		{
			if (toUpdate)
			{
				Sow();
				toUpdate = false;
			}
		}

		public void Sow()
		{
			UOUtility.DestroyChildren(generated);
			UnityEngine.Random.InitState(randomSeed);
			if (spacing + spacingRange <= 0f || prefab == null)
			{
				return;
			}
			for (float num = 0f; num <= spline.Length; num += spacing + UnityEngine.Random.Range(0f, spacingRange))
			{
				CurveSample sampleAtDistance = spline.GetSampleAtDistance(num);
				GameObject gameObject = UnityEngine.Object.Instantiate(prefab, generated.transform);
				gameObject.transform.localRotation = Quaternion.identity;
				gameObject.transform.localPosition = Vector3.zero;
				gameObject.transform.localScale = Vector3.one;
				gameObject.transform.localPosition = sampleAtDistance.location;
				float num2 = scale + UnityEngine.Random.Range(0f, scaleRange);
				gameObject.transform.localScale = new Vector3(num2, num2, num2);
				if (isRandomYaw)
				{
					gameObject.transform.Rotate(0f, 0f, UnityEngine.Random.Range(-180, 180));
				}
				else
				{
					gameObject.transform.rotation = sampleAtDistance.Rotation;
				}
				Vector3 normalized = (Quaternion.LookRotation(sampleAtDistance.tangent, sampleAtDistance.up) * Vector3.right).normalized;
				float num3 = offset + UnityEngine.Random.Range(0f, offsetRange * (float)Math.Sign(offset));
				num3 *= sampleAtDistance.scale.x;
				normalized *= num3;
				gameObject.transform.position += normalized;
			}
		}
	}
}