using System;
using UnityEngine;

namespace RootMotion.FinalIK
{
	public class CCDBendGoal : MonoBehaviour
	{
		public CCDIK ik;

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

		private void Start()
		{
			IKSolverCCD solver = ik.solver;
			solver.OnPreUpdate = (IKSolver.UpdateDelegate)Delegate.Combine(solver.OnPreUpdate, new IKSolver.UpdateDelegate(BeforeIK));
		}

		private void BeforeIK()
		{
			if (!base.enabled)
			{
				return;
			}
			float num = ik.solver.IKPositionWeight * weight;
			if (!(num <= 0f))
			{
				Vector3 position = ik.solver.bones[0].transform.position;
				Quaternion quaternion = Quaternion.FromToRotation(ik.solver.bones[ik.solver.bones.Length - 1].transform.position - position, base.transform.position - position);
				if (num < 1f)
				{
					quaternion = Quaternion.Slerp(Quaternion.identity, quaternion, num);
				}
				ik.solver.bones[0].transform.rotation = quaternion * ik.solver.bones[0].transform.rotation;
			}
		}

		private void OnDestroy()
		{
			if (ik != null)
			{
				IKSolverCCD solver = ik.solver;
				solver.OnPreUpdate = (IKSolver.UpdateDelegate)Delegate.Remove(solver.OnPreUpdate, new IKSolver.UpdateDelegate(BeforeIK));
			}
		}
	}
}