/*
 * C# / XNA  port of Bullet (c) 2011 Mark Neale <[email protected]>
 *
 * Bullet Continuous Collision Detection and Physics Library
 * Copyright (c) 2003-2008 Erwin Coumans  http://www.bulletphysics.com/
 *
 * This software is provided 'as-is', without any express or implied warranty.
 * In no event will the authors be held liable for any damages arising from
 * the use of this software.
 *
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute it
 * freely, subject to the following restrictions:
 *
 * 1. The origin of this software must not be misrepresented; you must not
 *    claim that you wrote the original software. If you use this software
 *    in a product, an acknowledgment in the product documentation would be
 *    appreciated but is not required.
 * 2. Altered source versions must be plainly marked as such, and must not be
 *    misrepresented as being the original software.
 * 3. This notice may not be removed or altered from any source distribution.
 */
// Adapted from BulletXNA 73b2e1b9: namespace isolation, no XNA rendering, one type per file.
#nullable disable
#pragma warning disable CS1591, CS0168, CS0219, CS0414, CS0660, CS0661, CS0659, CS0693, CS8981, CS0108, CS0114
using HumanoidRetargeter.Core.Formats.Mmd.Bullet.LinearMath;

namespace HumanoidRetargeter.Core.Formats.Mmd.Bullet.BulletDynamics;

internal class Hinge2Constraint : Generic6DofSpringConstraint
{
	// constructor
	// anchor, axis1 and axis2 are in world coordinate system
	// axis1 must be orthogonal to axis2
	public Hinge2Constraint(RigidBody rbA, RigidBody rbB, ref IndexedVector3 anchor, ref IndexedVector3 axis1, ref IndexedVector3 axis2) : base(rbA, rbB, IndexedMatrix.Identity, IndexedMatrix.Identity, true)
	{
		m_anchor = anchor;
		m_axis1 = axis1;
		m_axis2 = axis2;
		// build frame basis
		// 6DOF constraint uses Euler angles and to define limits
		// it is assumed that rotational order is :
		// Z - first, allowed limits are (-PI,PI);
		// new position of Y - second (allowed limits are (-PI/2 + epsilon, PI/2 - epsilon), where epsilon is a small positive number
		// used to prevent constraint from instability on poles;
		// new position of X, allowed limits are (-PI,PI);
		// So to simulate ODE Universal joint we should use parent axis as Z, child axis as Y and limit all other DOFs
		// Build the frame in world coordinate system first
		IndexedVector3 zAxis = IndexedVector3.Normalize(axis1);
		IndexedVector3 xAxis = IndexedVector3.Normalize(axis2);
		IndexedVector3 yAxis = IndexedVector3.Cross(zAxis, xAxis); // we want right coordinate system
		IndexedMatrix frameInW = IndexedMatrix.Identity;
		frameInW._basis = new IndexedBasisMatrix(xAxis.X, yAxis.X, zAxis.X, xAxis.Y, yAxis.Y, zAxis.Y, xAxis.Z, yAxis.Z, zAxis.Z);
		frameInW._origin = anchor;
		// now get constraint frame in local coordinate systems
		m_frameInA = rbA.GetCenterOfMassTransform().Inverse() * frameInW;
		m_frameInB = rbB.GetCenterOfMassTransform().Inverse() * frameInW;
		// sei limits
		SetLinearLowerLimit(new IndexedVector3(0.0f, 0.0f, -1.0f));
		SetLinearUpperLimit(new IndexedVector3(0.0f, 0.0f, 1.0f));
		// like front wheels of a car
		SetAngularLowerLimit(new IndexedVector3(1.0f, 0.0f, -MathUtil.SIMD_HALF_PI * 0.5f));
		SetAngularUpperLimit(new IndexedVector3(-1.0f, 0.0f, MathUtil.SIMD_HALF_PI * 0.5f));
		// enable suspension
		EnableSpring(2, true);
		SetStiffness(2, MathUtil.SIMD_PI * MathUtil.SIMD_PI * 4.0f); // period 1 sec for 1 kilogramm weel :-)
		SetDamping(2, 0.01f);
		SetEquilibriumPoint();
	}

	// access
	public IndexedVector3 GetAnchor()
	{
		return m_calculatedTransformA._origin;
	}

	public IndexedVector3 GetAnchor2()
	{
		return m_calculatedTransformB._origin;
	}

	public IndexedVector3 GetAxis1()
	{
		return m_axis1;
	}

	public IndexedVector3 GetAxis2()
	{
		return m_axis2;
	}

	public float GetAngle1()
	{
		return GetAngle(2);
	}

	public float GetAngle2()
	{
		return GetAngle(0);
	}

	// limits
	public void SetUpperLimit(float ang1max)
	{
		SetAngularUpperLimit(new IndexedVector3(-1.0f, 0.0f, ang1max));
	}

	public void SetLowerLimit(float ang1min)
	{
		SetAngularLowerLimit(new IndexedVector3(1.0f, 0.0f, ang1min));
	}

	protected IndexedVector3 m_anchor;
	protected IndexedVector3 m_axis1;
	protected IndexedVector3 m_axis2;
}