using UnityEngine;

namespace RootMotion.FinalIK
{
	public class LookAtController : MonoBehaviour
	{
		public LookAtIK ik;

		[Header("Target Smoothing")]
		[Tooltip("The target to look at. Do not use the Target transform that is assigned to LookAtIK. Set to null if you wish to stop looking.")]
		public Transform target;

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

		public Vector3 offset;

		[Tooltip("The time it takes to switch targets.")]
		public float targetSwitchSmoothTime = 0.3f;

		[Tooltip("The time it takes to blend in/out of LookAtIK weight.")]
		public float weightSmoothTime = 0.3f;

		[Header("Turning Towards The Target")]
		[Tooltip("Enables smooth turning towards the target according to the parameters under this header.")]
		public bool smoothTurnTowardsTarget = true;

		[Tooltip("Speed of turning towards the target using Vector3.RotateTowards.")]
		public float maxRadiansDelta = 3f;

		[Tooltip("Speed of moving towards the target using Vector3.RotateTowards.")]
		public float maxMagnitudeDelta = 3f;

		[Tooltip("Speed of slerping towards the target.")]
		public float slerpSpeed = 3f;

		[Tooltip("The position of the pivot that the look at target is rotated around relative to the root of the character.")]
		public Vector3 pivotOffsetFromRoot = Vector3.up;

		[Tooltip("Minimum distance of looking from the first bone. Keeps the solver from failing if the target is too close.")]
		public float minDistance = 1f;

		[Header("RootRotation")]
		[Tooltip("Character root will be rotate around the Y axis to keep root forward within this angle from the look direction.")]
		[Range(0f, 180f)]
		public float maxRootAngle = 45f;

		private Transform lastTarget;

		private float switchWeight;

		private float switchWeightV;

		private float weightV;

		private Vector3 lastPosition;

		private Vector3 dir;

		private bool lastSmoothTowardsTarget;

		private Vector3 pivot => ik.transform.position + ik.transform.rotation * pivotOffsetFromRoot;

		private void Start()
		{
			lastPosition = ik.solver.IKPosition;
			dir = ik.solver.IKPosition - pivot;
		}

		private void LateUpdate()
		{
			if (target != lastTarget)
			{
				if (lastTarget == null && target != null && ik.solver.IKPositionWeight <= 0f)
				{
					lastPosition = target.position;
					dir = target.position - pivot;
					ik.solver.IKPosition = target.position + offset;
				}
				else
				{
					lastPosition = ik.solver.IKPosition;
					dir = ik.solver.IKPosition - pivot;
				}
				switchWeight = 0f;
				lastTarget = target;
			}
			ik.solver.IKPositionWeight = Mathf.SmoothDamp(ik.solver.IKPositionWeight, (target != null) ? weight : 0f, ref weightV, weightSmoothTime);
			if (ik.solver.IKPositionWeight >= 0.999f)
			{
				ik.solver.IKPositionWeight = 1f;
			}
			if (ik.solver.IKPositionWeight <= 0.001f)
			{
				ik.solver.IKPositionWeight = 0f;
			}
			if (!(ik.solver.IKPositionWeight <= 0f))
			{
				switchWeight = Mathf.SmoothDamp(switchWeight, 1f, ref switchWeightV, targetSwitchSmoothTime);
				if (switchWeight >= 0.999f)
				{
					switchWeight = 1f;
				}
				if (target != null)
				{
					ik.solver.IKPosition = Vector3.Lerp(lastPosition, target.position + offset, switchWeight);
				}
				if (smoothTurnTowardsTarget != lastSmoothTowardsTarget)
				{
					dir = ik.solver.IKPosition - pivot;
					lastSmoothTowardsTarget = smoothTurnTowardsTarget;
				}
				if (smoothTurnTowardsTarget)
				{
					Vector3 b = ik.solver.IKPosition - pivot;
					dir = Vector3.Slerp(dir, b, Time.deltaTime * slerpSpeed);
					dir = Vector3.RotateTowards(dir, b, Time.deltaTime * maxRadiansDelta, maxMagnitudeDelta);
					ik.solver.IKPosition = pivot + dir;
				}
				ApplyMinDistance();
				RootRotation();
			}
		}

		private void ApplyMinDistance()
		{
			Vector3 vector = pivot;
			Vector3 vector2 = ik.solver.IKPosition - vector;
			vector2 = vector2.normalized * Mathf.Max(vector2.magnitude, minDistance);
			ik.solver.IKPosition = vector + vector2;
		}

		private void RootRotation()
		{
			float num = Mathf.Lerp(180f, maxRootAngle, ik.solver.IKPositionWeight);
			if (num < 180f)
			{
				Vector3 vector = Quaternion.Inverse(ik.transform.rotation) * (ik.solver.IKPosition - pivot);
				float num2 = Mathf.Atan2(vector.x, vector.z) * 57.29578f;
				float angle = 0f;
				if (num2 > num)
				{
					angle = num2 - num;
				}
				if (num2 < 0f - num)
				{
					angle = num2 + num;
				}
				ik.transform.rotation = Quaternion.AngleAxis(angle, ik.transform.up) * ik.transform.rotation;
			}
		}
	}
}