/*
 * #%L
 * BSD implementations of Bio-Formats readers and writers
 * %%
 * Copyright (C) 2005 - 2015 Open Microscopy Environment:
 *   - Board of Regents of the University of Wisconsin-Madison
 *   - Glencoe Software, Inc.
 *   - University of Dundee
 * %%
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 * #L%
 */

package loci.formats.tools;

import java.awt.image.BufferedImage;

/**
 * A utility class for outputting a BufferedImage as ASCII text.
 */
public class AsciiImage {

  // -- Constants --

  private static final String NL = System.getProperty("line.separator");
  private static final String CHARS = " .,-+o*O#";

  // -- Fields --

  private BufferedImage img;

  // -- Constructor --

  public AsciiImage(BufferedImage img) {
    this.img = img;
  }

  // -- Object methods --

  @Override
  public String toString() {
    final int width = img.getWidth();
    final int height = img.getHeight();
    final StringBuilder sb = new StringBuilder();
    for (int y=0; y<height; y++) {
      for (int x=0; x<width; x++) {
        final int pix = img.getRGB(x, y);
        final int a = 0xff & (pix >> 24);
        final int r = 0xff & (pix >> 16);
        final int g = 0xff & (pix >> 8);
        final int b = 0xff & pix;
        final int avg = (r + g + b) / 3;
        sb.append(getChar(avg));
      }
      sb.append(NL);
    }
    return sb.toString();
  }

  // -- Helper methods --

  private char getChar(int value) {
    int index = CHARS.length() * value / 256;
    return CHARS.charAt(index);
  }

}