using System;
using System.Numerics;
using System.Runtime.Serialization;
using CustomizePlus.Core.Extensions;
using CustomizePlus.Game.Services.GPose.ExternalTools;
using FFXIVClientStructs.Havok;

namespace CustomizePlus.Core.Data;

//not the correct terms but they double as user-visible labels so ¯\_(ツ)_/¯
public enum BoneAttribute
{
    //hard-coding the backing values for legacy purposes
    Position = 0,
    Rotation = 1,
    Scale = 2
}

[Serializable]
public class BoneTransform
{
    //TODO if if ever becomes a point of concern, I might be able to marginally speed things up
    //by natively storing translation and scaling values as their own vector4s
    //that way the cost of translating back and forth to vector3s would be frontloaded
    //to when the user is updating things instead of during the render loop

    public BoneTransform()
    {
        Translation = Vector3.Zero;
        Rotation = Vector3.Zero;
        Scaling = Vector3.One;
    }

    public BoneTransform(BoneTransform original)
    {
        UpdateToMatch(original);
    }

    private Vector3 _translation;
    public Vector3 Translation
    {
        get => _translation;
        set => _translation = ClampVector(value);
    }

    private Vector3 _rotation;
    public Vector3 Rotation
    {
        get => _rotation;
        set => _rotation = ClampAngles(value);
    }

    private Vector3 _scaling;
    public Vector3 Scaling
    {
        get => _scaling;
        set => _scaling = ClampVector(value);
    }

    [OnDeserialized]
    internal void OnDeserialized(StreamingContext context)
    {
        //Sanitize all values on deserialization
        _translation = ClampToDefaultLimits(_translation);
        _rotation = ClampAngles(_rotation);
        _scaling = ClampToDefaultLimits(_scaling);
    }

    public bool IsEdited()
    {
        return !Translation.IsApproximately(Vector3.Zero, 0.00001f)
               || !Rotation.IsApproximately(Vector3.Zero, 0.1f)
               || !Scaling.IsApproximately(Vector3.One, 0.00001f);
    }

    public BoneTransform DeepCopy()
    {
        return new BoneTransform
        {
            Translation = Translation,
            Rotation = Rotation,
            Scaling = Scaling
        };
    }

    public void UpdateAttribute(BoneAttribute which, Vector3 newValue)
    {
        if (which == BoneAttribute.Position)
        {
            Translation = newValue;
        }
        else if (which == BoneAttribute.Rotation)
        {
            Rotation = newValue;
        }
        else
        {
            Scaling = newValue;
        }
    }

    public void UpdateToMatch(BoneTransform newValues)
    {
        Translation = newValues.Translation;
        Rotation = newValues.Rotation;
        Scaling = newValues.Scaling;
    }

    /// <summary>
    ///     Flip a bone's transforms from left to right, so you can use it to update its sibling.
    ///     IVCS bones need to use the special reflection instead.
    /// </summary>
    public BoneTransform GetStandardReflection()
    {
        return new BoneTransform
        {
            Translation = new Vector3(Translation.X, Translation.Y, -1 * Translation.Z),
            Rotation = new Vector3(-1 * Rotation.X, -1 * Rotation.Y, Rotation.Z),
            Scaling = Scaling
        };
    }

    /// <summary>
    ///     Flip a bone's transforms from left to right, so you can use it to update its sibling.
    ///     IVCS bones are oriented in a system with different symmetries, so they're handled specially.
    /// </summary>
    public BoneTransform GetSpecialReflection()
    {
        return new BoneTransform
        {
            Translation = new Vector3(Translation.X, -1 * Translation.Y, Translation.Z),
            Rotation = new Vector3(Rotation.X, -1 * Rotation.Y, -1 * Rotation.Z),
            Scaling = Scaling
        };
    }

    /// <summary>
    /// Sanitize all vectors inside of this container.
    /// </summary>
    private void Sanitize()
    {
        _translation = ClampVector(_translation);
        _rotation = ClampAngles(_rotation);
        _scaling = ClampVector(_scaling);
    }

    /// <summary>
    /// Clamp all vector values to be within allowed limits.
    /// </summary>
    private Vector3 ClampVector(Vector3 vector)
    {
        return new Vector3
        {
            X = Math.Clamp(vector.X, Constants.MinVectorValueLimit, Constants.MaxVectorValueLimit),
            Y = Math.Clamp(vector.Y, Constants.MinVectorValueLimit, Constants.MaxVectorValueLimit),
            Z = Math.Clamp(vector.Z, Constants.MinVectorValueLimit, Constants.MaxVectorValueLimit)
        };
    }

    private static Vector3 ClampAngles(Vector3 rotVec)
    {
        static float Clamp(float angle)
        {
            if (angle > 180)
                angle -= 360;
            else if (angle < -180)
                angle += 360;

            return angle;
        }

        rotVec.X = Clamp(rotVec.X);
        rotVec.Y = Clamp(rotVec.Y);
        rotVec.Z = Clamp(rotVec.Z);

        return rotVec;
    }

    public hkQsTransformf ModifyExistingTransform(hkQsTransformf tr)
    {
        return ModifyExistingTranslationWithRotation(ModifyExistingRotation(ModifyExistingScale(tr)));
    }

    public hkQsTransformf ModifyExistingScale(hkQsTransformf tr)
    {
        if (PosingModeDetectService.IsAnamnesisScalingFrozen) return tr;

        tr.Scale.X *= Scaling.X;
        tr.Scale.Y *= Scaling.Y;
        tr.Scale.Z *= Scaling.Z;

        return tr;
    }

    public hkQsTransformf ModifyExistingRotation(hkQsTransformf tr)
    {
        if (PosingModeDetectService.IsAnamnesisRotationFrozen) return tr;

        var newRotation = Quaternion.Multiply(tr.Rotation.ToQuaternion(), Rotation.ToQuaternion());
        tr.Rotation.X = newRotation.X;
        tr.Rotation.Y = newRotation.Y;
        tr.Rotation.Z = newRotation.Z;
        tr.Rotation.W = newRotation.W;

        return tr;
    }

    public hkQsTransformf ModifyExistingTranslationWithRotation(hkQsTransformf tr)
    {
        if (PosingModeDetectService.IsAnamnesisPositionFrozen) return tr;

        var adjustedTranslation = Vector4.Transform(Translation, tr.Rotation.ToQuaternion());
        tr.Translation.X += adjustedTranslation.X;
        tr.Translation.Y += adjustedTranslation.Y;
        tr.Translation.Z += adjustedTranslation.Z;
        tr.Translation.W += adjustedTranslation.W;

        return tr;
    }

    public hkQsTransformf ModifyExistingTranslation(hkQsTransformf tr)
    {
        if (PosingModeDetectService.IsAnamnesisPositionFrozen) return tr;

        tr.Translation.X += Translation.X;
        tr.Translation.Y += Translation.Y;
        tr.Translation.Z += Translation.Z;

        return tr;
    }

    /// <summary>
    ///     Clamp all vector values to be within allowed limits.
    /// </summary>
    private static Vector3 ClampToDefaultLimits(Vector3 vector)
    {
        vector.X = Math.Clamp(vector.X, Constants.MinVectorValueLimit, Constants.MaxVectorValueLimit);
        vector.Y = Math.Clamp(vector.Y, Constants.MinVectorValueLimit, Constants.MaxVectorValueLimit);
        vector.Z = Math.Clamp(vector.Z, Constants.MinVectorValueLimit, Constants.MaxVectorValueLimit);

        return vector;
    }
}