package org.webswing.directdraw;

import java.awt.Font;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.awt.image.ColorModel;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.IntBuffer;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;

import javax.imageio.ImageIO;

import org.apache.commons.codec.binary.Base64;
import org.webswing.directdraw.util.ImageConsumerAdapter;

public class DirectDrawServicesAdapter {

	private Map<String, String> fontFileMap;

	public byte[] getPngImage(BufferedImage imageContent) {
		try {
			ByteArrayOutputStream baos = new ByteArrayOutputStream();
			ImageIO.write(imageContent, "png", baos);
			return baos.toByteArray();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return null;
	}

	public long getSignature(byte[] data) {
		return Arrays.hashCode(data);
	}

	public String encodeBytes(byte[] bytes) {
		return Base64.encodeBase64String(bytes);
	}

	public long computeHash(Image subImage) {                 
		ImageConsumerAdapter ic = new ImageConsumerAdapter() {
			@Override
			public void setPixels(int x, int y, int w, int h, ColorModel model, int[] pixels, int off, int scansize) {
				for (int i = off; i < off + scansize; i++) {
					hash = hash * 31 + pixels[i];
				}
			}
                        
			@Override
			public void setPixels(int x, int y, int w, int h, ColorModel model, byte[] pixels, int off, int scansize) {
				for (int i = off; i < off + scansize; i++) {
					hash = hash * 31 + pixels[i];
				}
			}
                        
                        @Override
			public void setDimensions(int width, int height) {
                                hash = hash * 31 + width;
                                hash = hash * 31 + height;
			}
		};
		subImage.getSource().startProduction(ic);
		return ic.getHash();
	}

	public String getFileForFont(Font font) {
		if (font != null) {
			Map<String, String> map = getFontFileMap();
			String fontName = font.getFontName().toLowerCase();
			String file = map.get(fontName);
			return file;
		}
		return null;
	}

	private Map<String, String> getFontFileMap() {
		if (fontFileMap == null) {
			fontFileMap = new HashMap<String, String>();
			try {
				String customFontConfigFile = System.getProperty("sun.awt.fontconfig");
				if (customFontConfigFile != null && new File(customFontConfigFile).canRead()) {
					File f = new File(customFontConfigFile);
					Scanner s = new Scanner(f);
					try {
						while (s.hasNextLine()) {
							String line = s.nextLine();
							if (line.startsWith("#@@")) {
								String[] values = line.substring(3).split("=");
								if (values.length == 2) {
									fontFileMap.put(values[0].toLowerCase(), values[1]);
								}
							}

						}
					} finally {
						s.close();
					}
				}
			} catch (FileNotFoundException e) {
				System.err.println("Failed to initialize font file map for DirectDraw rendering.");
				e.printStackTrace();
			}
		}
		return fontFileMap;
	}

}