/**
 * Copyright (c) 2006-2023 LOVE Development Team
 *
 * 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.
 **/

#include "Contact.h"
#include "World.h"
#include "Physics.h"

namespace love
{
namespace physics
{
namespace box2d
{

love::Type Contact::type("Contact", &Object::type);

Contact::Contact(World *world, b2Contact *contact)
	: contact(contact)
	, world(world)
{
	world->registerObject(contact, this);
}

Contact::~Contact()
{
	invalidate();
}

void Contact::invalidate()
{
	if (contact != nullptr)
	{
		world->unregisterObject(contact);
		contact = nullptr;
	}
}

bool Contact::isValid()
{
	return contact != nullptr;
}

int Contact::getPositions(lua_State *L)
{
	love::luax_assert_argc(L, 1, 1);
	b2WorldManifold manifold;
	contact->GetWorldManifold(&manifold);
	int points = contact->GetManifold()->pointCount;
	for (int i = 0; i < points; i++)
	{
		b2Vec2 position = Physics::scaleUp(manifold.points[i]);
		lua_pushnumber(L, position.x);
		lua_pushnumber(L, position.y);
	}
	return points*2;
}

int Contact::getNormal(lua_State *L)
{
	love::luax_assert_argc(L, 1, 1);
	b2WorldManifold manifold;
	contact->GetWorldManifold(&manifold);
	lua_pushnumber(L, manifold.normal.x);
	lua_pushnumber(L, manifold.normal.y);
	return 2;
}

float Contact::getFriction() const
{
	return contact->GetFriction();
}

float Contact::getRestitution() const
{
	return contact->GetRestitution();
}

bool Contact::isEnabled() const
{
	return contact->IsEnabled();
}

bool Contact::isTouching() const
{
	return contact->IsTouching();
}

void Contact::setFriction(float friction)
{
	contact->SetFriction(friction);
}

void Contact::setRestitution(float restitution)
{
	contact->SetRestitution(restitution);
}

void Contact::setEnabled(bool enabled)
{
	contact->SetEnabled(enabled);
}

void Contact::resetFriction()
{
	contact->ResetFriction();
}

void Contact::resetRestitution()
{
	contact->ResetRestitution();
}

void Contact::setTangentSpeed(float speed)
{
	contact->SetTangentSpeed(speed);
}

float Contact::getTangentSpeed() const
{
	return contact->GetTangentSpeed();
}

void Contact::getChildren(int &childA, int &childB)
{
	childA = contact->GetChildIndexA();
	childB = contact->GetChildIndexB();
}

void Contact::getShapes(Shape *&shapeA, Shape *&shapeB)
{
	shapeA = (Shape *) (contact->GetFixtureA()->GetUserData().pointer);
	shapeB = (Shape *) (contact->GetFixtureB()->GetUserData().pointer);

	if (!shapeA || !shapeB)
		throw love::Exception("A Shape has escaped Memoizer!");
}

} // box2d
} // physics
} // love