using System;
using UnityEngine;

namespace FIMSpace.FTools
{
	[Serializable]
	public abstract class FIK_ProcessorBase
	{
		[Range(0f, 1f)]
		public float IKWeight = 1f;

		public Vector3 IKTargetPosition;

		public Quaternion IKTargetRotation;

		public Vector3 LastLocalDirection;

		public Vector3 LocalDirection;

		[NonSerialized]
		public bool CallPreCalibrate = true;

		public float fullLength { get; protected set; }

		public bool Initialized { get; protected set; }

		public FIK_IKBoneBase[] Bones { get; protected set; }

		public FIK_IKBoneBase StartBone => Bones[0];

		public FIK_IKBoneBase EndBone => Bones[Bones.Length - 1];

		public Quaternion StartBoneRotationOffset { get; set; } = Quaternion.identity;

		public virtual void Init(Transform root)
		{
			StartBoneRotationOffset = Quaternion.identity;
		}

		public virtual void PreCalibrate()
		{
			if (CallPreCalibrate)
			{
				for (FIK_IKBoneBase fIK_IKBoneBase = Bones[0]; fIK_IKBoneBase != null; fIK_IKBoneBase = fIK_IKBoneBase.Child)
				{
					fIK_IKBoneBase.transform.localRotation = fIK_IKBoneBase.InitialLocalRotation;
				}
			}
		}

		public virtual void Update()
		{
		}

		public static float EaseInOutQuint(float start, float end, float value)
		{
			value /= 0.5f;
			end -= start;
			if (value < 1f)
			{
				return end * 0.5f * value * value * value * value * value + start;
			}
			value -= 2f;
			return end * 0.5f * (value * value * value * value * value + 2f) + start;
		}
	}
}