package imageproc.processing.detection;

import org.trianacode.taskgraph.Unit;
import triana.types.TrianaPixelMap;
import triana.types.image.PixelMap;

/**
 * A GetHoles unit to ..
 *
 * @author Melanie Rhianna Lewis
 * @version 1.0 alpha 29 Aug 1997
 */
public class GetHoles extends Unit {

    /**
     * ********************************************* ** USER CODE of GetHoles goes here    ***
     * *********************************************
     */
    public void process() {
        TrianaPixelMap trianaPixelMap = (TrianaPixelMap) getInputAtNode(0);
        PixelMap pixelMap = trianaPixelMap.getPixelMap();
        PixelMap newPixelMap = new PixelMap(pixelMap);
        int[] newPixels = newPixelMap.getPixels();
        int width = newPixelMap.getWidth();
        int height = newPixelMap.getHeight();

        // Fill in the gaps around the 'object'

        // The top and bottom
        for (int x = 0; x < newPixelMap.getWidth(); x++) {
            if ((newPixelMap.getPixel(x, 0) & 0xffffff) == 0) {
                newPixelMap.fillBlack(x, 0, 0xffffff);
            }

            if ((newPixelMap.getPixel(x, newPixelMap.getHeight() - 1) & 0xffffff) == 0) {
                newPixelMap.fillBlack(x, newPixelMap.getHeight() - 1, 0xffffff);
            }
        }

        // The left and right
        for (int y = 0; y < newPixelMap.getHeight(); y++) {
            if ((newPixelMap.getPixel(0, y) & 0xffffff) == 0) {
                newPixelMap.fillBlack(0, y, 0xffffff);
            }

            if ((newPixelMap.getPixel(newPixelMap.getWidth() - 1, y) & 0xffffff) == 0) {
                newPixelMap.fillBlack(newPixelMap.getWidth() - 1, y, 0xffffff);
            }
        }

        // now get the holes!
        for (int i = 0; i < newPixels.length; i++) {
            newPixels[i] = (newPixels[i] & 0xff000000) |
                    ((newPixels[i] & 0xffffff) == 0 ? 0xffffff : 0);
        }

        output(new TrianaPixelMap(newPixelMap));
    }

    /**
     * Initialses information specific to GetHoles.
     */
    public void init() {
        super.init();

        setDefaultInputNodes(1);
        setMinimumInputNodes(1);
        setMaximumInputNodes(Integer.MAX_VALUE);

        setDefaultOutputNodes(1);
        setMinimumOutputNodes(1);
        setMaximumOutputNodes(Integer.MAX_VALUE);
    }

    /**
     * Reset's GetHoles
     */
    public void reset() {
        super.reset();
    }

    /**
     * Saves GetHoles's parameters to the parameter file.
     */
    public void saveParameters() {
    }

    /**
     * Loads GetHoles's parameters of from the parameter file.
     */
    public void setParameter(String name, String value) {
    }

    /**
     * @return a string containing the names of the types allowed to be input to GetHoles, each separated by a white
     *         space.
     */
    public String[] getInputTypes() {
        return new String[]{"triana.types.TrianaPixelMap"};
    }

    public String[] getOutputTypes() {
        return new String[]{"triana.types.Const"};
    }

    /**
     * This returns a <b>brief!</b> description of what the unit does. The text here is shown in a pop up window when
     * the user puts the mouse over the unit icon for more than a second.
     */
    public String getPopUpDescription() {
        return "Obtains the holes (black areas) in a TrianaPixelMap.";
    }

    /**
     *
     * @returns the location of the help file for this unit.  
     */
    public String getHelpFile() {
        return "GetHoles.html";
    }
}