package de.intevation.flys.client.client.ui;

import com.google.gwt.core.client.GWT;
import com.google.gwt.resources.client.ImageResource;

import com.smartgwt.client.types.Alignment;
import com.smartgwt.client.widgets.Img;
import com.smartgwt.client.widgets.Label;
import com.smartgwt.client.widgets.layout.HLayout;
import com.smartgwt.client.widgets.layout.VLayout;

import de.intevation.flys.client.client.FLYSImages;
import de.intevation.flys.client.client.FLYSConstants;


/**
 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
 */
public class FLYSHeader extends HLayout {

    /** The interface that provides the image resources. */
    private FLYSImages IMAGES = GWT.create(FLYSImages.class);

    /** The interface that provides the message resources. */
    private FLYSConstants MESSAGES = GWT.create(FLYSConstants.class);

    /** The height used for this header.*/
    public static final int HEIGHT = 75;

    /** The height used for the images.*/
    public static final int IMG_HEIGHT = 50;


    public FLYSHeader() {
        init();
    }

    public void init() {
        setWidth100();
        setHeight(HEIGHT);
        setLayoutLeftMargin(5);
        setLayoutRightMargin(5);

        ImageResource flysRes = IMAGES.logoFlys();
        ImageResource bfgRes  = IMAGES.logoBfg();

        Img flys = new Img(
            flysRes.getURL(),
            calcWidth(flysRes,IMG_HEIGHT),
            IMG_HEIGHT);

        Img bfg  = new Img(
            bfgRes.getURL(),
            calcWidth(bfgRes, HEIGHT),
            HEIGHT);

        Label fullname = new Label(MESSAGES.fullname());
        fullname.setHeight(HEIGHT - IMG_HEIGHT);
        fullname.setStyleName ("fontNormalMid");

        VLayout left = new VLayout();
        left.addMember(flys);
        left.addMember(fullname);

        HLayout right = new HLayout();
        right.setAlign(Alignment.RIGHT);
        right.addMember(bfg);

        addMember(left);
        addMember(right);
    }


    /**
     * This method calculates the wight of an image relative to the given
     * height.
     *
     * @param res The ImageResource that points to the image.
     * @param height The pre-defined height.
     *
     * @return the calculated width that should be used for the image.
     */
    protected int calcWidth(ImageResource res, int height) {
        int widthOrig  = res.getWidth();
        int heightOrig = res.getHeight();

        double factor = (double)heightOrig / height;
        double width  = (double)widthOrig / factor;

        return (int) width * 10 / 10;
    }
}
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