#include "Ball.h"
#include "Paddle.h"

Ball::Ball(void)
{
}

Ball::~Ball(void)
{
}

float Ball::radius()
{
	return getTexture()->getContentSize().width / 2;
}

Ball* Ball::ballWithTexture(CCTexture2D* aTexture)
{
	Ball* pBall = new Ball();
	pBall->initWithTexture(aTexture);
	pBall->autorelease();

	return pBall;
}

void Ball::move(ccTime delta)
{
	this->setPosition( ccpAdd(getPosition(), ccpMult(m_velocity, delta)) );
	
	if (getPosition().x > 320 - radius()) 
	{
		setPosition( ccp( 320 - radius(), getPosition().y) );
		m_velocity.x *= -1;
	} 
	else if (getPosition().x < radius()) 
	{
		setPosition( ccp(radius(), getPosition().y) );
		m_velocity.x *= -1;
	}
}

void Ball::collideWithPaddle(Paddle* paddle)
{
	CGRect paddleRect = paddle->rect();
	paddleRect.origin.x += paddle->getPosition().x;
	paddleRect.origin.y += paddle->getPosition().y;
	
    float lowY = CGRect::CGRectGetMinY(paddleRect);
	float midY = CGRect::CGRectGetMidY(paddleRect);
	float highY = CGRect::CGRectGetMaxY(paddleRect);
	
	float leftX = CGRect::CGRectGetMinX(paddleRect);
	float rightX = CGRect::CGRectGetMaxX(paddleRect);
	
	if (getPosition().x > leftX && getPosition().x < rightX) {
	
		bool hit = false;
		float angleOffset = 0.0f; 
		
		if (getPosition().y > midY && getPosition().y <= highY + radius()) 
		{
			setPosition( CGPointMake(getPosition().x, highY + radius()) );
			hit = true;
			angleOffset = (float)M_PI / 2;
		}
		else if (getPosition().y < midY && getPosition().y >= lowY - radius()) 
		{
			setPosition( CGPointMake(getPosition().x, lowY - radius()) );
			hit = true;
			angleOffset = -(float)M_PI / 2;
		}
		
		if (hit) 
		{
			float hitAngle = ccpToAngle(ccpSub(paddle->getPosition(), getPosition())) + angleOffset;
			
			float scalarVelocity = ccpLength(m_velocity) * 1.05f;
			float velocityAngle = -ccpToAngle(m_velocity) + 0.5f * hitAngle;
			
			m_velocity = ccpMult(ccpForAngle(velocityAngle), scalarVelocity);
		}
	}	
}