package com.cp.atheater;

import java.awt.image.BufferedImage;

public class Converter
{

    private static final char[] characterTransformTable =
            {
                    '#', 'W', 'M', 'B', 'R', 'X',
                    'V', 'Y', 'I', 't', 'i', '+',
                    '=', ';', ':', ',', '.'
            };

    public ASCIIFrame convert(BufferedImage image)
    { 
        return convert(image, ASCIIType.ASCII_TELNET);
    }

    public ASCIIFrame convert(BufferedImage image, int resolution)
    {
        return convert(image, ASCIIType.ASCII_TELNET, resolution);
    }

    public ASCIIFrame convert(BufferedImage image, ASCIIType type)
    {
        return convert(image, type, 3);
    }

    public ASCIIFrame convert(BufferedImage image, ASCIIType type, int resolution)
    {
        int width = image.getWidth(), height = image.getHeight();
        char[] letters = new char[(((width * height) / resolution) + height) + 1];
        int[] colors = new int[letters.length];
        int lastHeight = 0;
        for (int index = 0; index < width * height; index += resolution)
        {
                if (index % width != lastHeight)
                {
                    lastHeight = index % width;
                    continue;
                }
                letters[index / resolution] = renderSingleCharacter(image.getRGB(index % width, index / width));
                colors[index / resolution] = image.getRGB(index % width, index / width);
            //output += '\n';
        }
        return new ASCIIFrame(letters, colors);
    }

    private char renderSingleCharacter(int rgb)
    {
        int green = (rgb >> 8) & 0xff;
        int blue = (rgb >> 16) & 0xff;
        int brightness = green * 2 + blue;
        return characterTransformTable[Math.round(brightness / 50) + 1];
    }

}