#import "HelloWorldLayer.h"

#define PTM_RATIO 32


@implementation HelloWorldLayer

+(CCScene *) scene{
    CCScene *scene = [CCScene node];

    HelloWorldLayer *layer = [HelloWorldLayer node];
    [scene addChild: layer];

    return scene;
}

-(id) init {

    if( (self=[super init])) {

        CGSize winSize = [CCDirector sharedDirector].winSize;

        self.isAccelerometerEnabled = YES;
        self.isTouchEnabled = YES;

        // Create sprite and add it to the layer
        _spear = [CCSprite spriteWithFile:@"SPEAR.png" rect:CGRectMake(0, 0, 100, 10)];
        _spear.position = ccp(100, 100);
        [self addChild:_spear];

        // Create a world
        b2Vec2 gravity = b2Vec2(0.0f, -20.0f);
        bool doSleep = true;
        _world = new b2World(gravity, doSleep);

        // Create edges around the entire screen
        b2BodyDef groundBodyDef;
        groundBodyDef.position.Set(0,0);
        b2Body *groundBody = _world->CreateBody(&groundBodyDef);
        b2PolygonShape groundBox;
        b2FixtureDef boxShapeDef;
        boxShapeDef.shape = &groundBox;
        groundBox.SetAsEdge(b2Vec2(0,0), b2Vec2(winSize.width/PTM_RATIO, 0));
        groundBody->CreateFixture(&boxShapeDef);
        groundBox.SetAsEdge(b2Vec2(0,0), b2Vec2(0, winSize.height/PTM_RATIO));
        groundBody->CreateFixture(&boxShapeDef);
        groundBox.SetAsEdge(b2Vec2(0, winSize.height/PTM_RATIO), b2Vec2(winSize.width/PTM_RATIO, winSize.height/PTM_RATIO));
        groundBody->CreateFixture(&boxShapeDef);
        groundBox.SetAsEdge(b2Vec2(winSize.width/PTM_RATIO, winSize.height/PTM_RATIO), b2Vec2(winSize.width/PTM_RATIO, 0));
        groundBody->CreateFixture(&boxShapeDef);


        // Create spear body and shape
        b2BodyDef spearBodyDef;
        spearBodyDef.type = b2_dynamicBody;
        spearBodyDef.position.Set(100/PTM_RATIO, 100/PTM_RATIO);
        spearBodyDef.userData = _spear;
        b2Body *_spearBody = _world->CreateBody(&spearBodyDef);

        b2PolygonShape spearShape;
        spearShape.SetAsBox(100/PTM_RATIO, 10/PTM_RATIO);
        b2FixtureDef spearShapeDef;
        spearShapeDef.shape = &spearShape;
        spearShapeDef.density = 1.0f;
        spearShapeDef.friction = 0.9f;
        spearShapeDef.restitution = 0.89f;


        b2Vec2 force;
        force.Set(_spearBody->GetLinearVelocity().x+5.0f, _spearBody->GetLinearVelocity().y+10.0f);
        _spearBody->SetLinearVelocity(force);

        [self schedule:@selector(tick:)];
    }
    return self;
}

- (void)tick:(ccTime) dt {

    _world->Step(dt, 10, 10);
    for(b2Body *b = _world->GetBodyList(); b; b=b->GetNext()) {
        if (b->GetUserData() != NULL) {
            CCSprite *ballData = (CCSprite *)b->GetUserData();
            ballData.position = ccp(b->GetPosition().x * PTM_RATIO,
                                    b->GetPosition().y * PTM_RATIO);
            ballData.rotation = -1 * CC_RADIANS_TO_DEGREES(b->GetAngle());
        }
    }
}

- (void) dealloc {
    delete _world;
    _world = NULL;

    [super dealloc];
}
@end