using System;
using UnityEngine;

namespace RootMotion.FinalIK
{
	[Serializable]
	public class InteractionLookAt
	{
		[Tooltip("(Optional) reference to the LookAtIK component that will be used to make the character look at the objects that it is interacting with.")]
		public LookAtIK ik;

		[Tooltip("Interpolation speed of the LookAtIK target.")]
		public float lerpSpeed = 5f;

		[Tooltip("Interpolation speed of the LookAtIK weight.")]
		public float weightSpeed = 1f;

		[HideInInspector]
		public bool isPaused;

		private Transform lookAtTarget;

		private float stopLookTime;

		private float weight;

		private bool firstFBBIKSolve;

		public void Look(Transform target, float time)
		{
			if (!(ik == null))
			{
				if (ik.solver.IKPositionWeight <= 0f)
				{
					ik.solver.IKPosition = ik.solver.GetRoot().position + ik.solver.GetRoot().forward * 3f;
				}
				lookAtTarget = target;
				stopLookTime = time;
			}
		}

		public void OnFixTransforms()
		{
			if (!(ik == null) && ik.fixTransforms)
			{
				ik.solver.FixTransforms();
			}
		}

		public void Update()
		{
			if (ik == null)
			{
				return;
			}
			if (ik.enabled)
			{
				ik.enabled = false;
			}
			if (!(lookAtTarget == null))
			{
				if (isPaused)
				{
					stopLookTime += Time.deltaTime;
				}
				float num = ((Time.time < stopLookTime) ? weightSpeed : (0f - weightSpeed));
				weight = Mathf.Clamp(weight + num * Time.deltaTime, 0f, 1f);
				ik.solver.IKPositionWeight = Interp.Float(weight, InterpolationMode.InOutQuintic);
				ik.solver.IKPosition = Vector3.Lerp(ik.solver.IKPosition, lookAtTarget.position, lerpSpeed * Time.deltaTime);
				if (weight <= 0f)
				{
					lookAtTarget = null;
				}
				firstFBBIKSolve = true;
			}
		}

		public void SolveSpine()
		{
			if (!(ik == null) && firstFBBIKSolve)
			{
				float headWeight = ik.solver.headWeight;
				float eyesWeight = ik.solver.eyesWeight;
				ik.solver.headWeight = 0f;
				ik.solver.eyesWeight = 0f;
				ik.solver.Update();
				ik.solver.headWeight = headWeight;
				ik.solver.eyesWeight = eyesWeight;
			}
		}

		public void SolveHead()
		{
			if (!(ik == null) && firstFBBIKSolve)
			{
				float bodyWeight = ik.solver.bodyWeight;
				ik.solver.bodyWeight = 0f;
				ik.solver.Update();
				ik.solver.bodyWeight = bodyWeight;
				firstFBBIKSolve = false;
			}
		}
	}
}