/****************************************************************************
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 The above copyright notice and this permission notice shall be included in
 all copies or substantial portions of the Software.
 
 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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//
// Accelerometer + Chipmunk physics + multi touches example
// a cocos2d example
// http://www.cocos2d-x.org
//

#include "chipmunk/chipmunk.h"

#include "ChipmunkTest.h"


USING_NS_CC;
USING_NS_CC_EXT;

enum {
    kTagParentNode = 1,
};

enum {
    Z_PHYSICS_DEBUG = 100,
};

// callback to remove Shapes from the Space

ChipmunkTest::ChipmunkTest()
{   
    // enable events

    auto touchListener = EventListenerTouchAllAtOnce::create();
    touchListener->onTouchesEnded = CC_CALLBACK_2(ChipmunkTest::onTouchesEnded, this);
    _eventDispatcher->addEventListenerWithSceneGraphPriority(touchListener, this);
    
    Device::setAccelerometerEnabled(true);
    auto accListener = EventListenerAcceleration::create(CC_CALLBACK_2(ChipmunkTest::onAcceleration, this));
    _eventDispatcher->addEventListenerWithSceneGraphPriority(accListener, this);
    
    // title
    auto label = Label::createWithTTF("Multi touch the screen", "fonts/Marker Felt.ttf", 36.0f);
    label->setPosition(VisibleRect::center().x, VisibleRect::top().y - 30);
    this->addChild(label, -1);

    // reset button
    createResetButton();

    // init physics
    initPhysics();

#if 1
    // Use batch node. Faster
    auto parent = SpriteBatchNode::create("Images/grossini_dance_atlas.png", 100);
    _spriteTexture = parent->getTexture();
#else
    // doesn't use batch node. Slower
    _spriteTexture = Director::getInstance()->getTextureCache()->addImage("Images/grossini_dance_atlas.png");
    auto parent = Node::create();
#endif
    addChild(parent, 0, kTagParentNode);

    addNewSpriteAtPosition(cocos2d::Vec2(200.0f,200.0f));

    // menu for debug layer
    MenuItemFont::setFontSize(18);
    auto item = MenuItemFont::create("Toggle debug", CC_CALLBACK_1(ChipmunkTest::toggleDebugCallback, this));

    auto menu = Menu::create(item, nullptr);
    this->addChild(menu);
    menu->setPosition(VisibleRect::right().x-100, VisibleRect::top().y-60);

    scheduleUpdate();
    
}

void ChipmunkTest::toggleDebugCallback(Ref* sender)
{
#if CC_ENABLE_CHIPMUNK_INTEGRATION
    _debugLayer->setVisible(! _debugLayer->isVisible());
#endif
}

ChipmunkTest::~ChipmunkTest()
{
#if CC_ENABLE_CHIPMUNK_INTEGRATION
    // manually Free rogue shapes
    for( int i=0;i<4;i++) {
        cpShapeFree( _walls[i] );
    }

#if CC_TARGET_PLATFORM == CC_PLATFORM_WIN32
	cpSpaceFree(_space);
#else
	cpHastySpaceFree(_space);
#endif

    Device::setAccelerometerEnabled(false);
#endif
}

void ChipmunkTest::initPhysics()
{

    // init chipmunk
    //cpInitChipmunk();

#if CC_TARGET_PLATFORM == CC_PLATFORM_WIN32
	_space = cpSpaceNew();
#else
	_space = cpHastySpaceNew();
	cpHastySpaceSetThreads(_space, 0);
#endif

    cpSpaceSetGravity(_space, cpv(0.0f, -100.0f));

    //
    // rogue shapes
    // We have to free them manually
    //
    // bottom
    _walls[0] = cpSegmentShapeNew( cpSpaceGetStaticBody(_space),
        cpv(VisibleRect::leftBottom().x,VisibleRect::leftBottom().y),
        cpv(VisibleRect::rightBottom().x, VisibleRect::rightBottom().y), 0.0f);

    // top
    _walls[1] = cpSegmentShapeNew( cpSpaceGetStaticBody(_space),
        cpv(VisibleRect::leftTop().x, VisibleRect::leftTop().y),
        cpv(VisibleRect::rightTop().x, VisibleRect::rightTop().y), 0.0f);

    // left
    _walls[2] = cpSegmentShapeNew( cpSpaceGetStaticBody(_space),
        cpv(VisibleRect::leftBottom().x,VisibleRect::leftBottom().y),
        cpv(VisibleRect::leftTop().x,VisibleRect::leftTop().y), 0.0f);

    // right
    _walls[3] = cpSegmentShapeNew( cpSpaceGetStaticBody(_space), 
        cpv(VisibleRect::rightBottom().x, VisibleRect::rightBottom().y),
        cpv(VisibleRect::rightTop().x, VisibleRect::rightTop().y), 0.0f);

    for( int i=0;i<4;i++) {
        
        cpShapeSetElasticity(_walls[i], 1.0f);
        cpShapeSetFriction(_walls[i], 1.0f);
        cpSpaceAddShape(_space, _walls[i]);
    }

    // Physics debug layer
    _debugLayer = PhysicsDebugNode::create(_space);
    this->addChild(_debugLayer, Z_PHYSICS_DEBUG);

}

void ChipmunkTest::update(float delta)
{
    // Should use a fixed size step based on the animation interval.
    int steps = 2;
    float dt = Director::getInstance()->getAnimationInterval()/(float)steps;

    for(int i=0; i<steps; i++){

#if CC_TARGET_PLATFORM == CC_PLATFORM_WIN32
		cpSpaceStep(_space, dt);
#else
		cpHastySpaceStep(_space, dt);
#endif
    }
}

void ChipmunkTest::createResetButton()
{
    auto reset = MenuItemImage::create("Images/r1.png", "Images/r2.png", CC_CALLBACK_1(ChipmunkTest::reset, this));

    auto menu = Menu::create(reset, nullptr);

    menu->setPosition(VisibleRect::center().x, VisibleRect::bottom().y + 30);
    this->addChild(menu, -1);
}

void ChipmunkTest::reset(Ref* sender)
{
    getTestSuite()->restartCurrTest();
}

void ChipmunkTest::addNewSpriteAtPosition(cocos2d::Vec2 pos)
{
    int posx, posy;

    auto parent = getChildByTag(kTagParentNode);

    posx = CCRANDOM_0_1() * 200.0f;
    posy = CCRANDOM_0_1() * 200.0f;

    posx = (posx % 4) * 85;
    posy = (posy % 3) * 121;


    int num = 4;
    cpVect verts[] = {
        cpv(-24,-54),
        cpv(-24, 54),
        cpv( 24, 54),
        cpv( 24,-54),
    };

    cpBody *body = cpBodyNew(1.0f, cpMomentForPoly(1.0f, num, verts, cpvzero, 0.0f));

    cpBodySetPosition(body, cpv(pos.x, pos.y));
    cpSpaceAddBody(_space, body);

    cpShape* shape = cpPolyShapeNew(body, num, verts, cpTransformIdentity, 0.0f);
    cpShapeSetElasticity(shape, 0.5f);
    cpShapeSetFriction(shape, 0.5f);
    cpSpaceAddShape(_space, shape);

    auto sprite = PhysicsSpriteChipmunk2D::createWithTexture(_spriteTexture, cocos2d::Rect(posx, posy, 85, 121));
    parent->addChild(sprite);

    sprite->setCPBody(body);
    sprite->setPosition(pos);

}

void ChipmunkTest::onEnter()
{
    TestCase::onEnter();
}

void ChipmunkTest::onTouchesEnded(const std::vector<Touch*>& touches, Event* event)
{
    //Add a new body/atlas sprite at the touched location

    for( auto &touch: touches)
    {
        auto location = touch->getLocation();

        addNewSpriteAtPosition( location );
    }
}

void ChipmunkTest::onAcceleration(Acceleration* acc, Event* event)
{
    static float prevX=0, prevY=0;

#define kFilterFactor 0.05f

    float accelX = (float) acc->x * kFilterFactor + (1- kFilterFactor)*prevX;
    float accelY = (float) acc->y * kFilterFactor + (1- kFilterFactor)*prevY;

    prevX = accelX;
    prevY = accelY;

    auto v = cocos2d::Vec2( accelX, accelY);
    v = v * 200;
    cpSpaceSetGravity(_space, cpv(v.x, v.y));
}

ChipmunkTests::ChipmunkTests()
{
    ADD_TEST_CASE(ChipmunkTest);
}