// the behavior for the image handling

Image {
    {{ byte [][] im;}}
    
    {{
	Image(String fname, int h, int w) {
	    height = h;
	    width = w;
	    im = readImageFromFile(fname, h, w);
	    maxPixelVal = caculateMax();
	}
	

	int caculateMax() {
	    int max = 0;
	    for (int y=0; y<height; y++) {
		for (int x=0; x<width; x++) {
		    if (max < im[y][x])
			max = im[y][x];
		}
	    }
	    return max;
	}

	byte [][] readImageFromFile(String fname, int h, int w) {
	    byte [][] returnByte = new byte[h][w];
	    try { 
		FileInputStream in = new FileInputStream(fname);
		for(int x=0; x<h; x++) {
		    in.read(returnByte[x]);
		}

	    } catch (Exception e) {
		System.out.println(e);
	    }
	    return returnByte;
	}

	boolean outsideImage(PixelCoord pixel) {
	    int x = pixel.get_x();
	    int y = pixel.get_y();
	    if (x < 1 || y < 1)
		return true;
	    if (x > width || y > height)
		return true;
	    return false;
	}
	
	void setPixel(int x, int y, int val) {
	    im[y-1][x-1] = (byte) val;
	}

	void setPixel(PixelCoord pixel, int val) {
	    setPixel(pixel.get_x(), pixel.get_y(), val);
	}


	int getPixelVal(int x, int y) {
	    return im[y-1][x-1];
	    
	}

	int getPixelVal(PixelCoord pixel) {
	    return getPixelVal(pixel.get_x(), pixel.get_y());
	}

	

	void save(String fname) {
	    try {
		FileOutputStream out = new FileOutputStream(fname);
		for (int x=0; x<height; x++) {
		    out.write(im[x]);
		}
		out.close();
	    } catch (Exception e) {
		System.out.println(e);
	    }
	}

	void print() {
	    for (int y=0; y<height; y++) {
		for (int x=0; x<width; x++) {
		    System.out.print((int)im[y][x] + " ");
		}
		System.out.println();
	    }
	    
	}

	Image sameSizeBlank() {
	    Image imCopy = new Image();
	    
	    imCopy.height = height;
	    imCopy.width = width;
	    imCopy.im = new byte[height][width];

	    for (int y = 0; y < height; y++) {
		for (int x = 0; x < width; x++) {
		    imCopy.im[y][x] = 0;
		}
	    }

	    return imCopy;
	}

	Image copy() {
	    Image imCopy = new Image();

	    imCopy.height = height;
	    imCopy.width = width;

	    for (int y = 0; y < height; y++) {
		for (int x = 0; x < width; x++) {
		    imCopy.im[y][x] = im[y][x];
		}
	    }

	    return imCopy;
	}

    }}
}