!7

cmodule ChessBoardRecognizer {
  S segmenterPreset;
  ParameterizedSegmenter segmenter;
  S status;

  transient ReliableSingleThread rst = dm_rst(module(), r recognize);
  transient BufferedImage img, board;
  transient ImageSurface isBoard;
  
  visual
    withCalc(rst, northCenterAndSouthWithMargins(
      withLabel("Segmenter preset: ", main.onChange(rst, dm_comboBox segmenterPreset(agiBlue_segmenterPresetNames()))),
      jSection("Chess board", isBoard = jImageSurface()),
      dm_label('status)
    ));
    
  void recognize {
    segmenter = parameterizedSegmenterFromAGIBlue(segmenterPreset);
    if (segmenter == null) ret with infoBox(status("No segmenter"));
    img = dm_shootScreenHidingOS();
    L<Rect> rects = segmenter.get(img);
    if (empty(rects)) ret with status("No chess board found");
    Rect r = first(rects);
    if (l(rects) > 1) status("More than one chess board found, choosing one");
    else status("Chess board found at: " + r);
    board = clipBufferedImage(img, r);
    
    if (isBoard != null)
      isBoard.setImage(
        mergeBufferedImagesVertically(
          map(bufferedImageNVerticalSlices(8, board), i ->
            mergeBufferedImagesHorizontally(bufferedImageNHorizontalSlices(8, i)))));
  }
  
  S status(S status) { setField(+status); ret status; }
}