import java.util.*;
import java.awt.Color;

public class IncrementRedExamination {
	public static void main(String[] args) {
		int[][] pixel = new int[5][4];
		int[][] copy = new int[5][4];
		int[][] more = new int[5][4];
		int[][] less = new int[5][4];
		
		int delta = 50;

		Random die = new Random();

		for (int i = 0; i < 4; ++i) {
			for (int j = 0; j < 3; ++j) {
				int r = die.nextInt(256);
				int g = die.nextInt(256);
				int b = die.nextInt(256);
				copy[i][j] = pixel[i][j] = colorsToInt(r, g, b);
				int moreRed = ( r+delta > 255 ) ? 255 : r + delta;
				int lessRed = ( r-delta < 0 )   ?   0 : r - delta;
				more[i][j] = colorsToInt( moreRed, g, b);
				less[i][j] = colorsToInt( lessRed, g, b);
			}
		}

		System.out.println();
		System.out.println();
		System.out.println( "Picture pixels");
		print( pixel );
		System.out.println();
		System.out.println();
		System.out.println( "Increasing red by " + delta );
		System.out.println();
		System.out.println();
		System.out.println( "Expected pixels");
		print(  more );
		System.out.println();
		System.out.println();
		StudentCode.incrementRed( pixel, delta);
		System.out.println( "Got pixels");
		print(  pixel );

		boolean redPlus = true;

		for (int i = 0; i < 4; ++i) {
			for (int j = 0; j < 3; ++j) {
				if ( pixel[i][j] != more[i][j] ) {
					System.out.printf( "Entry [ %1d ][ %1d ] wrong\n", i , j );
					redPlus = false;
				}
			}
		}

		if ( redPlus ) {
			System.out.println( "Correctly incremented red" );
		}
		System.out.println( "" );
		System.out.println();
		System.out.println();
		System.out.println( "Picture pixels");
		print( copy );
		System.out.println();
		System.out.println();
		System.out.println( "Decreasing red by " + delta );
		System.out.println();
		System.out.println();
		System.out.println( "Expected pixels");
		print(  less );
		System.out.println();
		System.out.println();
		StudentCode.incrementRed( copy, -delta);
		System.out.println( "Got pixels");
		print(  copy );

		boolean redLess = true;

		for (int i = 0; i < 4; ++i) {
			for (int j = 0; j < 3; ++j) {
				if ( copy[i][j] != less[i][j] ) {
					System.out.printf( "Entry [ %1d ][ %1d ] wrong\n", i , j );
					redLess = false;
				}
			}
		}

		if ( redLess ) {
			System.out.println( "Correctly decremented red" );
		}
	}

	public static void print( int[][] a ) {
		for (int i = 0; i < 4; ++i) {
			for (int j = 0; j < 3; ++j) {
				int c = a[i][j];
				System.out.printf("  %8d=(%3d,%3d,%3d)", c, red(c), green(c), blue(c));
			}
			System.out.println();
		}
	}

	public static int colorsToInt(int r, int g, int b) {
		return 256*256*r + 256*g + b;
	}

	public static int red(int n) {
		Color c = new Color( n );
		return c.getRed();
	}

	public static int green(int n) {
		Color c = new Color( n );
		return c.getGreen();
	}

	public static int blue(int n) {
		Color c = new Color( n );
		return c.getBlue();
	}
}