using UnityEngine;

namespace CinemaDirector
{
	public static class AnimationCurveHelper
	{
		public static int AddKey(AnimationCurve curve, Keyframe keyframe)
		{
			if (curve.length == 0)
			{
				return curve.AddKey(keyframe);
			}
			if (curve.length == 1)
			{
				Keyframe key = curve[0];
				int num = curve.AddKey(keyframe);
				switch (num)
				{
				case -1:
					return 0;
				case 0:
					curve.MoveKey(1, key);
					break;
				default:
					curve.MoveKey(0, key);
					break;
				}
				return num;
			}
			Keyframe key2 = default(Keyframe);
			Keyframe key3 = default(Keyframe);
			for (int i = 0; i < curve.length - 1; i++)
			{
				Keyframe keyframe2 = curve[i];
				Keyframe keyframe3 = curve[i + 1];
				if (keyframe2.time < keyframe.time && keyframe.time < keyframe3.time)
				{
					key2 = keyframe2;
					key3 = keyframe3;
				}
			}
			int num2 = curve.AddKey(keyframe);
			if (num2 > 0)
			{
				curve.MoveKey(num2 - 1, key2);
				int tangentMode = curve[num2 - 1].tangentMode;
				if (IsAuto(tangentMode))
				{
					curve.SmoothTangents(num2 - 1, 0f);
				}
				if (IsBroken(tangentMode) && IsRightLinear(tangentMode))
				{
					SetKeyRightLinear(curve, num2 - 1);
				}
			}
			if (num2 < curve.length - 1)
			{
				curve.MoveKey(num2 + 1, key3);
				int tangentMode2 = curve[num2 + 1].tangentMode;
				if (IsAuto(tangentMode2))
				{
					curve.SmoothTangents(num2 + 1, 0f);
				}
				if (IsBroken(tangentMode2) && IsLeftLinear(tangentMode2))
				{
					SetKeyLeftLinear(curve, num2 + 1);
				}
			}
			return num2;
		}

		public static int MoveKey(AnimationCurve curve, int index, Keyframe keyframe)
		{
			keyframe.tangentMode = curve[index].tangentMode;
			int num = curve.MoveKey(index, keyframe);
			if (IsAuto(keyframe.tangentMode))
			{
				curve.SmoothTangents(num, 0f);
			}
			else if (IsBroken(keyframe.tangentMode))
			{
				if (IsLeftLinear(keyframe.tangentMode))
				{
					SetKeyLeftLinear(curve, num);
				}
				if (IsRightLinear(keyframe.tangentMode))
				{
					SetKeyRightLinear(curve, num);
				}
			}
			if (num > 0)
			{
				int tangentMode = curve[num - 1].tangentMode;
				if (IsAuto(tangentMode))
				{
					curve.SmoothTangents(num - 1, 0f);
				}
				if (IsBroken(tangentMode) && IsRightLinear(tangentMode))
				{
					SetKeyRightLinear(curve, num - 1);
				}
			}
			if (num < curve.length - 1)
			{
				int tangentMode2 = curve[num + 1].tangentMode;
				if (IsAuto(tangentMode2))
				{
					curve.SmoothTangents(num + 1, 0f);
				}
				if (IsBroken(tangentMode2) && IsLeftLinear(tangentMode2))
				{
					SetKeyLeftLinear(curve, num + 1);
				}
			}
			return num;
		}

		public static void RemoveKey(AnimationCurve curve, int index)
		{
			curve.RemoveKey(index);
			if (index > 0)
			{
				int tangentMode = curve[index - 1].tangentMode;
				if (IsAuto(tangentMode))
				{
					curve.SmoothTangents(index - 1, 0f);
				}
				if (IsBroken(tangentMode) && IsRightLinear(tangentMode))
				{
					SetKeyRightLinear(curve, index - 1);
				}
			}
			if (index < curve.length)
			{
				int tangentMode2 = curve[index].tangentMode;
				if (IsAuto(tangentMode2))
				{
					curve.SmoothTangents(index, 0f);
				}
				if (IsBroken(tangentMode2) && IsLeftLinear(tangentMode2))
				{
					SetKeyLeftLinear(curve, index);
				}
			}
		}

		public static void SetKeyRightLinear(AnimationCurve curve, int index)
		{
			Keyframe keyframe = curve[index];
			float outTangent = keyframe.outTangent;
			if (index < curve.length - 1)
			{
				Keyframe keyframe2 = curve[index + 1];
				outTangent = (keyframe2.value - keyframe.value) / (keyframe2.time - keyframe.time);
			}
			Keyframe key = new Keyframe(keyframe.time, keyframe.value, keyframe.inTangent, outTangent);
			int num = ((!IsAuto(keyframe.tangentMode) && keyframe.tangentMode != 0) ? (keyframe.tangentMode % 8 - 1) : 0);
			key.tangentMode = num + 16 + 1;
			curve.MoveKey(index, key);
		}

		public static void SetKeyLeftLinear(AnimationCurve curve, int index)
		{
			Keyframe keyframe = curve[index];
			float inTangent = keyframe.inTangent;
			if (index > 0)
			{
				Keyframe keyframe2 = curve[index - 1];
				inTangent = (keyframe.value - keyframe2.value) / (keyframe.time - keyframe2.time);
			}
			Keyframe key = new Keyframe(keyframe.time, keyframe.value, inTangent, keyframe.outTangent);
			int num = ((keyframe.tangentMode > 16) ? (keyframe.tangentMode / 8 * 8) : 0);
			key.tangentMode = num + 1 + 4;
			curve.MoveKey(index, key);
		}

		public static bool IsAuto(int tangentMode)
		{
			return tangentMode == 10;
		}

		public static bool IsBroken(int tangentMode)
		{
			return tangentMode % 2 == 1;
		}

		public static bool IsRightLinear(int tangentMode)
		{
			return tangentMode / 8 == 2;
		}

		public static bool IsLeftLinear(int tangentMode)
		{
			return IsBroken(tangentMode) && tangentMode % 8 == 5;
		}
	}
}