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#include "CCPhysicsWorld.h"
#include "../utils/CCArmatureDefine.h"
#include "Box2D/Box2D.h"
#include "../external_tool/GLES-Render.h"

NS_CC_EXT_BEGIN


class Contact
{
public:
	b2Fixture *fixtureA;
	b2Fixture *fixtureB;
};

class ContactListener : public b2ContactListener
{
	//! Callbacks for derived classes.
	virtual void BeginContact(b2Contact *contact)
	{
		if (contact)
		{
			Contact c;
			c.fixtureA = contact->GetFixtureA();
			c.fixtureB = contact->GetFixtureB();

			contact_list.push_back(c);
		}
		B2_NOT_USED(contact);
	}
	virtual void EndContact(b2Contact *contact)
	{
		contact_list.clear();
		B2_NOT_USED(contact);
	}
	virtual void PreSolve(b2Contact *contact, const b2Manifold *oldManifold)
	{
		B2_NOT_USED(contact);
		B2_NOT_USED(oldManifold);
	}
	virtual void PostSolve(const b2Contact *contact, const b2ContactImpulse *impulse)
	{
		B2_NOT_USED(contact);
		B2_NOT_USED(impulse);
	}

public:
	std::list<Contact> contact_list;
};



CCPhysicsWorld *CCPhysicsWorld::s_PhysicsWorld = NULL;


CCPhysicsWorld *CCPhysicsWorld::sharedPhysicsWorld()
{
    if (s_PhysicsWorld == NULL)
    {
        s_PhysicsWorld = new CCPhysicsWorld();
        s_PhysicsWorld->initNoGravityWorld();
    }

    return s_PhysicsWorld;
}

void CCPhysicsWorld::purgePhysicsWorld()
{
    delete s_PhysicsWorld;
    s_PhysicsWorld = NULL;
}

CCPhysicsWorld::CCPhysicsWorld()
    : _noGravityWorld(NULL)
    , _debugDraw(NULL)
{
}

CCPhysicsWorld::~CCPhysicsWorld()
{
    CC_SAFE_DELETE(_debugDraw);
    CC_SAFE_DELETE(_noGravityWorld);
    CC_SAFE_DELETE(_contactListener);
}

void CCPhysicsWorld::initNoGravityWorld()
{
    b2Vec2 noGravity(0, 0);

    _noGravityWorld = new b2World(noGravity);
    _noGravityWorld->SetAllowSleeping(true);

    _contactListener = new ContactListener();
    _noGravityWorld->SetContactListener(_contactListener);


#if ENABLE_PHYSICS_DEBUG
    _debugDraw = new GLESDebugDraw( PT_RATIO );
    _noGravityWorld->SetDebugDraw(_debugDraw);

    uint32 flags = 0;
    flags += b2Draw::e_shapeBit;
    //        flags += b2Draw::e_jointBit;
    //        flags += b2Draw::e_aabbBit;
    //        flags += b2Draw::e_pairBit;
    //        flags += b2Draw::e_centerOfMassBit;
    _debugDraw->SetFlags(flags);
#endif
}

b2World *CCPhysicsWorld::getNoGravityWorld()
{
    return _noGravityWorld;
}

void CCPhysicsWorld::update(float dt)
{
    _noGravityWorld->Step(dt, 0, 0);

    for (std::list<Contact>::iterator it = _contactListener->contact_list.begin(); it != _contactListener->contact_list.end(); ++it)
    {
        Contact &contact = *it;

        b2Body *b2a = contact.fixtureA->GetBody();
        b2Body *b2b = contact.fixtureB->GetBody();

        CCBone *ba = (CCBone *)b2a->GetUserData();
        CCBone *bb = (CCBone *)b2b->GetUserData();

        BoneColliderSignal.emit(ba, bb);
    }

}

void CCPhysicsWorld::drawDebug()
{
    _noGravityWorld->DrawDebugData();
}

NS_CC_EXT_END