package colours;

import java.awt.Color;

public class TwentyFour implements Colour {
	private int red,green,blue;
	
	public TwentyFour() {
		this(255,255,255);
	}
	
	public TwentyFour(int r, int g, int b) {
		initialize(r,g,b);
	}
	
	public TwentyFour(String c) {
		int integerNumber;
		int r,g,b;
		try {
			integerNumber=Integer.parseInt(c,16);
			r=(integerNumber&0xFF0000)>>16;
			g=(integerNumber&0x00FF00)>>8;
			b=(integerNumber&0x0000FF);
			initialize(r,g,b);
		}
		catch (NumberFormatException nfe) {
			throw new InvalidColourException();
		}
	}
	
	public TwentyFour(Color c) {
		this(c.getRed(),c.getGreen(),c.getBlue());
	}
	
	private void initialize(int r, int g, int b) {
		if ((r<0)|(r>255)|(g<0)|(g>255)|(b<0)|(b>255)) throw new InvalidColourException();
		red=r; green=g; blue=b;
	}
	
	public double getRed() {
		return red/255.0;
	}
	public double getGreen() {
		return green/255.0;
	}
	public double getBlue() {
		return blue/255.0;
	}
	public double getCyan(){
		return 1.0-getRed();
	}
	public double getMagenta(){
		return 1.0-getGreen();
	}
	public double getYellow(){
		return 1.0-getBlue();
	}
	
	
	//Mixes another Colour with this one, to produce a new one.
	//"Mixing" is calculated by averaging the reds, greens, and blues
	public Colour mix(Colour c) {
		int r=(int)(255*(c.getRed()+getRed())/2);
		int g=(int)(255*(c.getGreen()+getGreen())/2);
		int b=(int)(255*(c.getBlue()+getBlue())/2);
		
		return new TwentyFour(r,g,b);
	}
	
	
	public Colour lighten() {
		int r=(255+red)/2;
		int g=(255+green)/2;
		int b=(255+blue)/2;
		return new TwentyFour(r,g,b);
	}
	public Colour darken() {
		return new TwentyFour(red/2,green/2,blue/2);
	}
	
	public Colour invert() {
		return new TwentyFour(255-red,255-green,255-blue);
	}
	
	public Colour grey() {
		double luminosity=(getRed()+getGreen()+getBlue())/3.0;
		int g=(int)(255*luminosity);
		return new TwentyFour(g,g,g);
	}
	
	
	//Any Colour should be String-ily expressed in 24-bit hexadecimal notation, irrespective of implementation
	public String toString() {
		String rs=Integer.toString(red,16),gs=Integer.toString(green,16),bs=Integer.toString(blue,16);
		return (rs.length()==1?"0"+rs:rs)+(gs.length()==1?"0"+gs:gs)+(bs.length()==1?"0"+bs:bs);
	}
	
	
	//Represent this colour as a java.awt.Color
	//Note: Do NOT use this function for any of the other methods you implement! (including mixing)
	public Color speltPoorly() {
		return new Color((float)getRed(),(float)getGreen(),(float)getBlue());
	}
	
}