using System;
using System.Collections.Generic;
using System.Linq;
using JetBrains.Annotations;
using UnityEditor;
using UnityEngine;
using Object = UnityEngine.Object;

// ReSharper disable once CheckNamespace
namespace AnimatorAsCode.V1
{
    public class AacFlClip
    {
        private readonly AacConfiguration _component;
        
        /// Exposes the underlying Unity Clip asset.
        [PublicAPI] public AnimationClip Clip { get; }

        internal AacFlClip(AacConfiguration component, AnimationClip clip)
        {
            _component = component;
            Clip = clip;
        }

        /// Set the clip to be looping.
        public AacFlClip Looping()
        {
            var settings = AnimationUtility.GetAnimationClipSettings(Clip);
            settings.loopTime = true;
            AnimationUtility.SetAnimationClipSettings(Clip, settings);

            return this;
        }
        
        /// Set the clip to be non-looping.
        public AacFlClip NonLooping()
        {
            var settings = AnimationUtility.GetAnimationClipSettings(Clip);
            settings.loopTime = false;
            AnimationUtility.SetAnimationClipSettings(Clip, settings);

            return this;
        }

        /// Start editing the clip with a lambda expression.
        public AacFlClip Animating(Action<AacFlEditClip> action)
        {
            action.Invoke(new AacFlEditClip(_component, Clip));
            return this;
        }

        /// Enable or disable GameObjects. This lasts one frame. The array can safely contain null values.
        public AacFlClip Toggling(GameObject[] gameObjectsWithNulls, bool value)
        {
            var defensiveObjects = gameObjectsWithNulls.Where(o => o != null); // Allow users to remove an item in the middle of the array
            foreach (var component in defensiveObjects)
            {
                var binding = AacInternals.Binding(_component, typeof(GameObject), component.transform, "m_IsActive");

                AacInternals.SetCurve(Clip, binding, AacInternals.OneFrame(value ? 1f : 0f));
            }

            return this;
        }

        /// Enable or disable a GameObject. This lasts one frame.
        public AacFlClip Toggling(GameObject gameObject, bool value)
        {
            var binding = AacInternals.Binding(_component, typeof(GameObject), gameObject.transform, "m_IsActive");

            AacInternals.SetCurve(Clip, binding, AacInternals.OneFrame(value ? 1f : 0f));

            return this;
        }

        /// Change a blendShape of a skinned mesh. This lasts one frame.
        public AacFlClip BlendShape(SkinnedMeshRenderer renderer, string blendShapeName, float value)
        {
            var binding = AacInternals.Binding(_component, typeof(SkinnedMeshRenderer), renderer.transform, $"blendShape.{blendShapeName}");

            AacInternals.SetCurve(Clip, binding, AacInternals.OneFrame(value));

            return this;
        }

        /// Change a blendShape of multiple skinned meshes. This lasts one frame. The array can safely contain null values.
        public AacFlClip BlendShape(SkinnedMeshRenderer[] rendererWithNulls, string blendShapeName, float value)
        {
            var defensiveObjects = rendererWithNulls.Where(o => o != null); // Allow users to remove an item in the middle of the array
            foreach (var component in defensiveObjects)
            {
                var binding = AacInternals.Binding(_component, typeof(SkinnedMeshRenderer), component.transform, $"blendShape.{blendShapeName}");

                AacInternals.SetCurve(Clip, binding, AacInternals.OneFrame(value));
            }

            return this;
        }

        /// Change a blendShape of a skinned mesh, with an animation curve.
        public AacFlClip BlendShape(SkinnedMeshRenderer renderer, string blendShapeName, AnimationCurve animationCurve)
        {
            var binding = AacInternals.Binding(_component, typeof(SkinnedMeshRenderer), renderer.transform, $"blendShape.{blendShapeName}");

            AacInternals.SetCurve(Clip, binding, animationCurve);

            return this;
        }

        /// Change a blendShape of multiple skinned meshes, with an animation curve. The array can safely contain null values.
        public AacFlClip BlendShape(SkinnedMeshRenderer[] rendererWithNulls, string blendShapeName, AnimationCurve animationCurve)
        {
            var defensiveObjects = rendererWithNulls.Where(o => o != null); // Allow users to remove an item in the middle of the array
            foreach (var component in defensiveObjects)
            {
                var binding = AacInternals.Binding(_component, typeof(SkinnedMeshRenderer), component.transform, $"blendShape.{blendShapeName}");

                AacInternals.SetCurve(Clip, binding, animationCurve);
            }

            return this;
        }
        
        public AacFlClip Positioning(Transform transform, Vector3 localPosition)
        {
            // Single-valued overloads must not tolerate null values
            if (transform == null) throw new NullReferenceException("Transform must not be null");
            return Positioning(new GameObject[]{ transform.gameObject }, localPosition);
        }

        public AacFlClip RotatingUsingEulerInterpolation(Transform transform, Vector3 localEulerAngles)
        {
            // Single-valued overloads must not tolerate null values
            if (transform == null) throw new NullReferenceException("Transform must not be null");
            return RotatingUsingEulerInterpolation(new GameObject[]{ transform.gameObject }, localEulerAngles);
        }
        
        public AacFlClip RotatingUsingQuaternionInterpolation(Transform transform, Quaternion localQuaternionAngles)
        {
            // Single-valued overloads must not tolerate null values
            if (transform == null) throw new NullReferenceException("Transform must not be null");
            return RotatingUsingQuaternionInterpolation(new GameObject[]{ transform.gameObject }, localQuaternionAngles);
        }
        
        public AacFlClip Scaling(Transform transform, Vector3 scale)
        {
            // Single-valued overloads must not tolerate null values
            if (transform == null) throw new NullReferenceException("Transform must not be null");
            return Scaling(new GameObject[]{ transform.gameObject }, scale);
        }
        
        public AacFlClip Positioning(GameObject gameObject, Vector3 localPosition)
        {
            // Single-valued overloads must not tolerate null values
            if (gameObject == null) throw new NullReferenceException("GameObject must not be null");
            return Positioning(new GameObject[]{ gameObject }, localPosition);
        }

        public AacFlClip RotatingUsingEulerInterpolation(GameObject gameObject, Vector3 localEulerAngles)
        {
            // Single-valued overloads must not tolerate null values
            if (gameObject == null) throw new NullReferenceException("GameObject must not be null");
            return RotatingUsingEulerInterpolation(new GameObject[]{ gameObject }, localEulerAngles);
        }
        
        public AacFlClip RotatingUsingQuaternionInterpolation(GameObject gameObject, Quaternion localQuaternionAngles)
        {
            // Single-valued overloads must not tolerate null values
            if (gameObject == null) throw new NullReferenceException("GameObject must not be null");
            return RotatingUsingQuaternionInterpolation(new GameObject[]{ gameObject }, localQuaternionAngles);
        }
        
        public AacFlClip Scaling(GameObject gameObject, Vector3 scale)
        {
            // Single-valued overloads must not tolerate null values
            if (gameObject == null) throw new NullReferenceException("GameObject must not be null");
            return Scaling(new GameObject[]{ gameObject }, scale);
        }
        
        public AacFlClip Positioning(Transform[] transformsWithNulls, Vector3 localPosition)
        {
            return Positioning(AsGameObjectsWithNulls(transformsWithNulls), localPosition);
        }

        public AacFlClip RotatingUsingEulerInterpolation(Transform[] transformsWithNulls, Vector3 localEulerAngles)
        {
            return RotatingUsingEulerInterpolation(AsGameObjectsWithNulls(transformsWithNulls), localEulerAngles);
        }
        
        public AacFlClip RotatingUsingQuaternionInterpolation(Transform[] transformsWithNulls, Quaternion localQuaternionAngles)
        {
            return RotatingUsingQuaternionInterpolation(AsGameObjectsWithNulls(transformsWithNulls), localQuaternionAngles);
        }
        
        public AacFlClip Scaling(Transform[] transformsWithNulls, Vector3 scale)
        {
            return Scaling(AsGameObjectsWithNulls(transformsWithNulls), scale);
        }

        private static GameObject[] AsGameObjectsWithNulls(Transform[] transformsWithNulls)
        {
            return transformsWithNulls.Select(o => o != null ? o.gameObject : null).ToArray();
        }

        /// Change the position of a GameObject in local space. This lasts one frame. This lasts one frame. The array can safely contain null values.
        public AacFlClip Positioning(GameObject[] gameObjectsWithNulls, Vector3 localPosition)
        {
            var defensiveObjects = gameObjectsWithNulls.Where(o => o != null); // Allow users to remove an item in the middle of the array
            foreach (var component in defensiveObjects)
            {
                AacInternals.SetCurve(Clip, AacInternals.Binding(_component, typeof(Transform), component.transform, "m_LocalPosition.x"), AacInternals.OneFrame(localPosition.x));
                AacInternals.SetCurve(Clip, AacInternals.Binding(_component, typeof(Transform), component.transform, "m_LocalPosition.y"), AacInternals.OneFrame(localPosition.y));
                AacInternals.SetCurve(Clip, AacInternals.Binding(_component, typeof(Transform), component.transform, "m_LocalPosition.z"), AacInternals.OneFrame(localPosition.z));
            }

            return this;
        }

        public AacFlClip RotatingUsingEulerInterpolation(GameObject[] gameObjectsWithNulls, Vector3 localEulerAngles)
        {
            var defensiveObjects = gameObjectsWithNulls.Where(o => o != null); // Allow users to remove an item in the middle of the array
            foreach (var component in defensiveObjects)
            {
                // See https://forum.unity.com/threads/new-animationclip-property-names.367288/#post-2384172
                // AacInternals.SetCurve internally uses AnimationClip.SetCurve instead of AnimationUtility.SetEditorCurve, starting from V1
                AacInternals.SetCurve(Clip, AacInternals.Binding(_component, typeof(Transform), component.transform, "m_LocalEuler.x"), AacInternals.OneFrame(localEulerAngles.x));
                AacInternals.SetCurve(Clip, AacInternals.Binding(_component, typeof(Transform), component.transform, "m_LocalEuler.y"), AacInternals.OneFrame(localEulerAngles.y));
                AacInternals.SetCurve(Clip, AacInternals.Binding(_component, typeof(Transform), component.transform, "m_LocalEuler.z"), AacInternals.OneFrame(localEulerAngles.z));
            }

            return this;
        }

        public AacFlClip RotatingUsingQuaternionInterpolation(GameObject[] gameObjectsWithNulls, Quaternion localQuaternionAngles)
        {
            var defensiveObjects = gameObjectsWithNulls.Where(o => o != null); // Allow users to remove an item in the middle of the array
            foreach (var component in defensiveObjects)
            {
                // See https://forum.unity.com/threads/new-animationclip-property-names.367288/#post-2384172
                // AacInternals.SetCurve internally uses AnimationClip.SetCurve instead of AnimationUtility.SetEditorCurve, starting from V1
                AacInternals.SetCurve(Clip, AacInternals.Binding(_component, typeof(Transform), component.transform, "m_LocalRotation.x"), AacInternals.OneFrame(localQuaternionAngles.x));
                AacInternals.SetCurve(Clip, AacInternals.Binding(_component, typeof(Transform), component.transform, "m_LocalRotation.y"), AacInternals.OneFrame(localQuaternionAngles.y));
                AacInternals.SetCurve(Clip, AacInternals.Binding(_component, typeof(Transform), component.transform, "m_LocalRotation.z"), AacInternals.OneFrame(localQuaternionAngles.z));
                AacInternals.SetCurve(Clip, AacInternals.Binding(_component, typeof(Transform), component.transform, "m_LocalRotation.w"), AacInternals.OneFrame(localQuaternionAngles.w));
            }

            return this;
        }

        public AacFlClip Scaling(GameObject[] gameObjectsWithNulls, Vector3 scale)
        {
            var defensiveObjects = gameObjectsWithNulls.Where(o => o != null); // Allow users to remove an item in the middle of the array
            foreach (var component in defensiveObjects)
            {
                AacInternals.SetCurve(Clip, AacInternals.Binding(_component, typeof(Transform), component.transform, "m_LocalScale.x"), AacInternals.OneFrame(scale.x));
                AacInternals.SetCurve(Clip, AacInternals.Binding(_component, typeof(Transform), component.transform, "m_LocalScale.y"), AacInternals.OneFrame(scale.y));
                AacInternals.SetCurve(Clip, AacInternals.Binding(_component, typeof(Transform), component.transform, "m_LocalScale.z"), AacInternals.OneFrame(scale.z));
            }

            return this;
        }

        public AacFlClip TogglingComponent(Component[] componentsWithNulls, bool value)
        {
            var defensiveComponents = componentsWithNulls.Where(o => o != null); // Allow users to remove an item in the middle of the array
            foreach (var component in defensiveComponents)
            {
                var binding = AacInternals.Binding(_component, component.GetType(), component.transform, "m_Enabled");

                AacInternals.SetCurve(Clip, binding, AacInternals.OneFrame(value ? 1f : 0f));
            }

            return this;
        }

        public AacFlClip TogglingComponent(Component component, bool value)
        {
            var binding = AacInternals.Binding(_component, component.GetType(), component.transform, "m_Enabled");

            AacInternals.SetCurve(Clip, binding, AacInternals.OneFrame(value ? 1f : 0f));

            return this;
        }

        /// Swap a material of a Renderer on the specified slot (indexed at 0). This lasts one frame.
        public AacFlClip SwappingMaterial(Renderer renderer, int slot, Material material)
        {
            var binding = AacInternals.Binding(_component, renderer.GetType(), renderer.transform, $"m_Materials.Array.data[{slot}]");

            AnimationUtility.SetObjectReferenceCurve(Clip, binding, new[] {
                new ObjectReferenceKeyframe { time = 0f, value = material },
                new ObjectReferenceKeyframe { time = 1/60f, value = material }
            });

            return this;
        }
        
        /// Swap a material of a Particle System on the specified slot (indexed at 0). This lasts one frame.<br/>
        /// In practice, this will animate the ParticleSystemRenderer of that particle system.
        public AacFlClip SwappingMaterial(ParticleSystem particleSystem, int slot, Material material)
        {
            var binding = AacInternals.Binding(_component, typeof(ParticleSystemRenderer), particleSystem.transform, $"m_Materials.Array.data[{slot}]");

            AnimationUtility.SetObjectReferenceCurve(Clip, binding, new[] {
                new ObjectReferenceKeyframe { time = 0f, value = material },
                new ObjectReferenceKeyframe { time = 1/60f, value = material }
            });

            return this;
        }
    }

    public class AacFlEditClip
    {
        private readonly AacConfiguration _component;
        [PublicAPI] public AnimationClip Clip { get; }

        internal AacFlEditClip(AacConfiguration component, AnimationClip clip)
        {
            _component = component;
            Clip = clip;
        }

        /// Animates a path the traditional way.
        public AacFlSettingCurve Animates(string path, Type type, string propertyName)
        {
            var binding = new EditorCurveBinding
            {
                path = path,
                type = type,
                propertyName = propertyName
            };
            return new AacFlSettingCurve(Clip, new[] {binding});
        }

        /// Animates an object in the hierarchy relative to the animator root, the traditional way.
        public AacFlSettingCurve Animates(Transform transform, Type type, string propertyName)
        {
            var binding = AacInternals.Binding(_component, type, transform, propertyName);

            return new AacFlSettingCurve(Clip, new[] {binding});
        }

        /// Animates the active property of a GameObject, toggling it.
        public AacFlSettingCurve Animates(GameObject gameObject)
        {
            var binding = AacInternals.Binding(_component, typeof(GameObject), gameObject.transform, "m_IsActive");

            return new AacFlSettingCurve(Clip, new[] {binding});
        }
        
        /// Animates the property of a component. The runtime type of the component will be used.
        public AacFlSettingCurve Animates(Component anyComponent, string property)
        {
            var binding = Internal_BindingFromComponent(anyComponent, property);

            return new AacFlSettingCurve(Clip, new[] {binding});
        }

        /// Animates the property of several components. The runtime type of the component will be used. The array can safely contain null values.
        public AacFlSettingCurve Animates(Component[] anyComponentsWithNulls, string property)
        {
            var bindings = Internal_BindingsFromComponentsWithNulls(anyComponentsWithNulls, property);
            
            return new AacFlSettingCurve(Clip, bindings);
        }

        /// Animates a Float parameter of the animator (may sometimes be referred to as an Animated Animator Parameter, or AAP).
        public AacFlSettingCurve AnimatesAnimator(AacFlParameter floatParameter)
        {
            var binding = new EditorCurveBinding
            {
                path = "",
                type = typeof(Animator),
                propertyName = floatParameter.Name
            };
            return new AacFlSettingCurve(Clip, new[] {binding});
        }

        /// Animates a color property of a component. The runtime type of the component will be used.
        public AacFlSettingCurveColor AnimatesColor(Component anyComponent, string property)
        {
            var binding = Internal_BindingFromComponent(anyComponent, property);
            return new AacFlSettingCurveColor(Clip, new[] {binding});
        }

        /// Animates a color property of several components. The runtime type of the component will be used.
        public AacFlSettingCurveColor AnimatesColor(Component[] anyComponentsWithNulls, string property)
        {
            var bindings = Internal_BindingsFromComponentsWithNulls(anyComponentsWithNulls, property);
            
            return new AacFlSettingCurveColor(Clip, bindings);
        }

        /// Animates an HDR color property of a component (uses XYZW instead of RGBA). The runtime type of the component will be used.
        public AacFlSettingCurveColor AnimatesHDRColor(Component anyComponent, string property)
        {
            var binding = Internal_BindingFromComponent(anyComponent, property);
            return new AacFlSettingCurveColor(Clip, new[] {binding}, true);
        }

        /// Animates an HDR color property of several components (uses XYZW instead of RGBA). The runtime type of the component will be used.
        public AacFlSettingCurveColor AnimatesHDRColor(Component[] anyComponentsWithNulls, string property)
        {
            var bindings = Internal_BindingsFromComponentsWithNulls(anyComponentsWithNulls, property);
            
            return new AacFlSettingCurveColor(Clip, bindings, true);
        }

        /// Animates an object reference of a component. The runtime type of the component will be used.
        public AacFlSettingCurveObjectReference AnimatesObjectReference(Component anyComponent, string property)
        {
            var binding = Internal_BindingFromComponent(anyComponent, property);
            return new AacFlSettingCurveObjectReference(Clip, new[] {binding});
        }

        /// Animates an object reference of several components. The runtime type of the component will be used.
        public AacFlSettingCurveObjectReference AnimatesObjectReference(Component[] anyComponentsWithNulls, string property)
        {
            var bindings = Internal_BindingsFromComponentsWithNulls(anyComponentsWithNulls, property);

            return new AacFlSettingCurveObjectReference(Clip, bindings);
        }

        /// Returns an EditorCurveBinding of a component, relative to the animator root. The runtime type of the component will be used.<br/>
        /// This is meant to be used in conjunction with traditional animation APIs.
        public EditorCurveBinding BindingFromComponent(Component anyComponent, string propertyName)
        {
            return Internal_BindingFromComponent(anyComponent, propertyName);
        }

        private EditorCurveBinding[] Internal_BindingsFromComponentsWithNulls(Component[] anyComponentsWithNulls, string property)
        {
            return anyComponentsWithNulls
                .Where(o => o != null)
                .Select(anyComponent => Internal_BindingFromComponent(anyComponent, property))
                .ToArray();
        }

        private EditorCurveBinding Internal_BindingFromComponent(Component anyComponent, string propertyName)
        {
            return AacInternals.Binding(_component, anyComponent.GetType(), anyComponent.transform, propertyName);
        }
    }

    public class AacFlSettingCurve
    {
        private readonly AnimationClip _clip;
        private readonly EditorCurveBinding[] _bindings;

        internal AacFlSettingCurve(AnimationClip clip, EditorCurveBinding[] bindings)
        {
            _clip = clip;
            _bindings = bindings;
        }

        /// Define the curve to be exactly one frame by defining two constant keyframes, usually lasting 1/60th of a second, with the desired value.
        public void WithOneFrame(float desiredValue)
        {
            foreach (var binding in _bindings)
            {
                AacInternals.SetCurve(_clip, binding, AacInternals.OneFrame(desiredValue));
            }
        }

        /// Define the curve to last a specific amount of seconds by defining two constant keyframes, with the desired value.
        public void WithFixedSeconds(float seconds, float desiredValue)
        {
            foreach (var binding in _bindings)
            {
                AacInternals.SetCurve(_clip, binding, AacInternals.ConstantSeconds(seconds, desiredValue));
            }
        }

        /// Start defining the keyframes with a lambda expression, expressing the unit to be in seconds.
        public void WithSecondsUnit(Action<AacFlSettingKeyframes> action)
        {
            InternalWithUnit(AacFlUnit.Seconds, action);
        }

        /// Start defining the keyframes with a lambda expression, expressing the unit in frames.
        public void WithFrameCountUnit(Action<AacFlSettingKeyframes> action)
        {
            InternalWithUnit(AacFlUnit.Frames, action);
        }

        /// Start defining the keyframes with a lambda expression, expressing the unit.
        public void WithUnit(AacFlUnit unit, Action<AacFlSettingKeyframes> action)
        {
            InternalWithUnit(unit, action);
        }

        private void InternalWithUnit(AacFlUnit unit, Action<AacFlSettingKeyframes> action)
        {
            var mutatedKeyframes = new List<Keyframe>();
            var builder = new AacFlSettingKeyframes(unit, mutatedKeyframes);
            action.Invoke(builder);

            foreach (var binding in _bindings)
            {
                AacInternals.SetCurve(_clip, binding, new AnimationCurve(mutatedKeyframes.ToArray()));
            }
        }

        /// Define the curve as the parameter. The duration is encoded inside the curve itself.
        public void WithAnimationCurve(AnimationCurve animationCurve)
        {
            foreach (var binding in _bindings)
            {
                AacInternals.SetCurve(_clip, binding, animationCurve);
            }
        }
    }

    public class AacFlSettingCurveObjectReference
    {
        private readonly AnimationClip _clip;
        private readonly EditorCurveBinding[] _bindings;

        internal AacFlSettingCurveObjectReference(AnimationClip clip, EditorCurveBinding[] bindings)
        {
            _clip = clip;
            _bindings = bindings;
        }

        /// Define the curve to be exactly one frame by defining two constant keyframes, usually lasting 1/60th of a second, with the desired object reference value.
        public void WithOneFrame(Object desiredValue)
        {
            foreach (var binding in _bindings)
            {
                AnimationUtility.SetObjectReferenceCurve(_clip, binding, new[]
                {
                    new ObjectReferenceKeyframe { time = 0f, value = desiredValue },
                    new ObjectReferenceKeyframe { time = 1/60f, value = desiredValue }
                });
            }
        }

        /// Obsolete. Use `WithUnit()` instead.<br/>
        /// Start defining the keyframes with a lambda expression, expressing the unit.
        [Obsolete("This function was renamed to WithUnit(...)")]
        public void WithKeyframes(AacFlUnit unit, Action<AacFlSettingKeyframesObjectReference> action)
        {
            WithUnit(unit, action);
        }
        
        /// Start defining the keyframes with a lambda expression, expressing the unit.
        public void WithUnit(AacFlUnit unit, Action<AacFlSettingKeyframesObjectReference> action)
        {
            var mutatedObjectReferenceKeyframes = new List<ObjectReferenceKeyframe>();
            var builder = new AacFlSettingKeyframesObjectReference(unit, mutatedObjectReferenceKeyframes);
            action.Invoke(builder);
            
            foreach (var binding in _bindings)
            {
                AnimationUtility.SetObjectReferenceCurve(_clip, binding, mutatedObjectReferenceKeyframes.ToArray());
            }
        }
    }

    public class AacFlSettingKeyframesObjectReference
    {
        private readonly AacFlUnit _unit;
        private readonly List<ObjectReferenceKeyframe> _mutatedKeyframes;

        internal AacFlSettingKeyframesObjectReference(AacFlUnit unit, List<ObjectReferenceKeyframe> mutatedKeyframes)
        {
            _unit = unit;
            _mutatedKeyframes = mutatedKeyframes;
        }

        /// Create a keyframe for an object reference. The unit is defined by the function that invokes this lambda expression.
        public AacFlSettingKeyframesObjectReference Setting(int timeInUnit, Object value)
        {
            _mutatedKeyframes.Add(new ObjectReferenceKeyframe { time = AsSeconds(timeInUnit), value = value });

            return this;
        }

        private float AsSeconds(float timeInUnit)
        {
            switch (_unit)
            {
                case AacFlUnit.Frames:
                    return timeInUnit / 60f;
                case AacFlUnit.Seconds:
                    return timeInUnit;
                default:
                    throw new ArgumentOutOfRangeException();
            }
        }
    }

    public class AacFlSettingCurveColor
    {
        private readonly AnimationClip _clip;
        private readonly EditorCurveBinding[] _bindings;
        private readonly bool _hdr;

        internal AacFlSettingCurveColor(AnimationClip clip, EditorCurveBinding[] bindings, bool hdr = false)
        {
            _clip = clip;
            _bindings = bindings;
            _hdr = hdr;
        }

        public void WithOneFrame(Color desiredValue)
        {
            foreach (var binding in _bindings)
            {
                AacInternals.SetCurve(_clip, AacInternals.ToSubBinding(binding, _hdr ? "x" : "r"), AacInternals.OneFrame(desiredValue.r));
                AacInternals.SetCurve(_clip, AacInternals.ToSubBinding(binding, _hdr ? "y" : "g"), AacInternals.OneFrame(desiredValue.g));
                AacInternals.SetCurve(_clip, AacInternals.ToSubBinding(binding, _hdr ? "z" : "b"), AacInternals.OneFrame(desiredValue.b));
                AacInternals.SetCurve(_clip, AacInternals.ToSubBinding(binding, _hdr ? "w" : "a"), AacInternals.OneFrame(desiredValue.a));
            }
        }

        /// Obsolete. Use `WithUnit()` instead.<br/>
        /// Start defining the keyframes with a lambda expression, expressing the unit.
        [Obsolete("This function was renamed to WithUnit(...)")]
        public void WithKeyframes(AacFlUnit unit, Action<AacFlSettingKeyframesColor> action)
        {
            WithUnit(unit, action);
        }

        /// Start defining the keyframes with a lambda expression, expressing the unit.
        public void WithUnit(AacFlUnit unit, Action<AacFlSettingKeyframesColor> action)
        {
            var mutatedKeyframesR = new List<Keyframe>();
            var mutatedKeyframesG = new List<Keyframe>();
            var mutatedKeyframesB = new List<Keyframe>();
            var mutatedKeyframesA = new List<Keyframe>();
            var builder = new AacFlSettingKeyframesColor(unit, mutatedKeyframesR, mutatedKeyframesG, mutatedKeyframesB, mutatedKeyframesA);
            action.Invoke(builder);

            foreach (var binding in _bindings)
            {
                AacInternals.SetCurve(_clip, AacInternals.ToSubBinding(binding, _hdr ? "x" : "r"), new AnimationCurve(mutatedKeyframesR.ToArray()));
                AacInternals.SetCurve(_clip, AacInternals.ToSubBinding(binding, _hdr ? "y" : "g"), new AnimationCurve(mutatedKeyframesG.ToArray()));
                AacInternals.SetCurve(_clip, AacInternals.ToSubBinding(binding, _hdr ? "z" : "b"), new AnimationCurve(mutatedKeyframesB.ToArray()));
                AacInternals.SetCurve(_clip, AacInternals.ToSubBinding(binding, _hdr ? "w" : "a"), new AnimationCurve(mutatedKeyframesA.ToArray()));
            }
        }
    }

    public class AacFlSettingKeyframes
    {
        private readonly AacFlUnit _unit;
        private readonly List<Keyframe> _mutatedKeyframes;

        internal AacFlSettingKeyframes(AacFlUnit unit, List<Keyframe> mutatedKeyframes)
        {
            _unit = unit;
            _mutatedKeyframes = mutatedKeyframes;
        }

        public AacFlSettingKeyframes Easing(float timeInUnit, float value)
        {
            _mutatedKeyframes.Add(new Keyframe(AsSeconds(timeInUnit), value, 0, 0));

            return this;
        }

        public AacFlSettingKeyframes Constant(float timeInUnit, float value)
        {
            _mutatedKeyframes.Add(new Keyframe(AsSeconds(timeInUnit), value, 0, float.PositiveInfinity));

            return this;
        }

        public AacFlSettingKeyframes Linear(float timeInUnit, float value)
        {
            float valueEnd = value;
            float valueStart = _mutatedKeyframes.Count == 0 ? value : _mutatedKeyframes.Last().value;
            float timeEnd = AsSeconds(timeInUnit);
            float timeStart = _mutatedKeyframes.Count == 0 ? value : _mutatedKeyframes.Last().time;
            float num = (float) (((double) valueEnd - (double) valueStart) / ((double) timeEnd - (double) timeStart));
            // FIXME: This can cause NaN tangents which messes everything

            // return new AnimationCurve(new Keyframe[2]
            // {
                // new Keyframe(timeStart, valueStart, 0.0f, num),
                // new Keyframe(timeEnd, valueEnd, num, 0.0f)
            // });

            if (_mutatedKeyframes.Count > 0)
            {
                var lastKeyframe = _mutatedKeyframes.Last();
                lastKeyframe.outTangent = num;
                _mutatedKeyframes[_mutatedKeyframes.Count - 1] = lastKeyframe;
            }
            _mutatedKeyframes.Add(new Keyframe(AsSeconds(timeInUnit), value, num, 0.0f));

            return this;
        }

        private float AsSeconds(float timeInUnit)
        {
            switch (_unit)
            {
                case AacFlUnit.Frames:
                    return timeInUnit / 60f;
                case AacFlUnit.Seconds:
                    return timeInUnit;
                default:
                    throw new ArgumentOutOfRangeException();
            }
        }
    }

    public class AacFlSettingKeyframesColor
    {
        private AacFlSettingKeyframes _r;
        private AacFlSettingKeyframes _g;
        private AacFlSettingKeyframes _b;
        private AacFlSettingKeyframes _a;

        internal AacFlSettingKeyframesColor(AacFlUnit unit, List<Keyframe> mutatedKeyframesR, List<Keyframe> mutatedKeyframesG, List<Keyframe> mutatedKeyframesB, List<Keyframe> mutatedKeyframesA)
        {
            _r = new AacFlSettingKeyframes(unit, mutatedKeyframesR);
            _g = new AacFlSettingKeyframes(unit, mutatedKeyframesG);
            _b = new AacFlSettingKeyframes(unit, mutatedKeyframesB);
            _a = new AacFlSettingKeyframes(unit, mutatedKeyframesA);
        }

        public AacFlSettingKeyframesColor Easing(int frame, Color value)
        {
            _r.Easing(frame, value.r);
            _g.Easing(frame, value.g);
            _b.Easing(frame, value.b);
            _a.Easing(frame, value.a);

            return this;
        }

        public AacFlSettingKeyframesColor Linear(float frame, Color value)
        {
            _r.Linear(frame, value.r);
            _g.Linear(frame, value.g);
            _b.Linear(frame, value.b);
            _a.Linear(frame, value.a);

            return this;
        }

        public AacFlSettingKeyframesColor Constant(int frame, Color value)
        {
            _r.Constant(frame, value.r);
            _g.Constant(frame, value.g);
            _b.Constant(frame, value.b);
            _a.Constant(frame, value.a);

            return this;
        }
    }

    public enum AacFlUnit
    {
        Frames, Seconds
    }
}