/*
* Copyright (c) 2006-2007 Erin Catto http:
*
* 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, and must not be
* misrepresented the original software.
* 3. This notice may not be removed or altered from any source distribution.
*/




/**
 * @class b2Joint
 * @constructor
 */
var b2Joint = function (def) {
	// initialize instance variables for references
	this.m_node1 = new b2JointNode();
	this.m_node2 = new b2JointNode();
	//

	this.m_type = def.type;
	this.m_prev = null;
	this.m_next = null;
	this.m_body1 = def.body1;
	this.m_body2 = def.body2;
	this.m_collideConnected = def.collideConnected;
	this.m_islandFlag = false;
	this.m_userData = def.userData;
};

b2Joint.prototype = 
{
	GetType: function(){
		return this.m_type;
	},

	GetAnchor1: function(){return null},
	GetAnchor2: function(){return null},

	GetReactionForce: function(invTimeStep){return null},
	GetReactionTorque: function(invTimeStep){return 0.0},

	GetBody1: function()
	{
		return this.m_body1;
	},

	GetBody2: function()
	{
		return this.m_body2;
	},

	GetNext: function(){
		return this.m_next;
	},

	GetUserData: function(){
		return this.m_userData;
	},

	//--------------- Internals Below -------------------

	//virtual ~b2Joint() {}

	PrepareVelocitySolver: function(){},
	SolveVelocityConstraints: function(step){},

	// This returns true if the position errors are within tolerance.
	PreparePositionSolver: function(){},
	SolvePositionConstraints: function(){return false},

	m_type: 0,
	m_prev: null,
	m_next: null,
	m_node1: new b2JointNode(),
	m_node2: new b2JointNode(),
	m_body1: null,
	m_body2: null,

	m_islandFlag: null,
	m_collideConnected: null,

	m_userData: null


	// ENUMS

	// enum b2JointType

	// enum b2LimitState

};

b2Joint.Create = function(def, allocator){
		var joint = null;

		switch (def.type)
		{
		case b2Joint.e_distanceJoint:
			{
				//void* mem = allocator->Allocate(sizeof(b2DistanceJoint));
				joint = new b2DistanceJoint(def);
			}
			break;

		case b2Joint.e_mouseJoint:
			{
				//void* mem = allocator->Allocate(sizeof(b2MouseJoint));
				joint = new b2MouseJoint(def);
			}
			break;

		case b2Joint.e_prismaticJoint:
			{
				//void* mem = allocator->Allocate(sizeof(b2PrismaticJoint));
				joint = new b2PrismaticJoint(def);
			}
			break;

		case b2Joint.e_revoluteJoint:
			{
				//void* mem = allocator->Allocate(sizeof(b2RevoluteJoint));
				joint = new b2RevoluteJoint(def);
			}
			break;

		case b2Joint.e_pulleyJoint:
			{
				//void* mem = allocator->Allocate(sizeof(b2PulleyJoint));
				joint = new b2PulleyJoint(def);
			}
			break;

		case b2Joint.e_gearJoint:
			{
				//void* mem = allocator->Allocate(sizeof(b2GearJoint));
				joint = new b2GearJoint(def);
			}
			break;

		default:
			//b2Settings.b2Assert(false);
			break;
		}

		return joint;
	};

b2Joint.Destroy = function(joint, allocator){
		/*joint->~b2Joint();
		switch (joint.m_type)
		{
		case b2Joint.e_distanceJoint:
			allocator->Free(joint, sizeof(b2DistanceJoint));
			break;

		case b2Joint.e_mouseJoint:
			allocator->Free(joint, sizeof(b2MouseJoint));
			break;

		case b2Joint.e_prismaticJoint:
			allocator->Free(joint, sizeof(b2PrismaticJoint));
			break;

		case b2Joint.e_revoluteJoint:
			allocator->Free(joint, sizeof(b2RevoluteJoint));
			break;

		case b2Joint.e_pulleyJoint:
			allocator->Free(joint, sizeof(b2PulleyJoint));
			break;

		case b2Joint.e_gearJoint:
			allocator->Free(joint, sizeof(b2GearJoint));
			break;

		default:
			b2Assert(false);
			break;
		}*/
	};
	
b2Joint.e_unknownJoint = 0;
b2Joint.e_revoluteJoint = 1;
b2Joint.e_prismaticJoint = 2;
b2Joint.e_distanceJoint = 3;
b2Joint.e_pulleyJoint = 4;
b2Joint.e_mouseJoint = 5;
b2Joint.e_gearJoint = 6;
b2Joint.e_inactiveLimit = 0;
b2Joint.e_atLowerLimit = 1;
b2Joint.e_atUpperLimit = 2;
b2Joint.e_equalLimits = 3;