// This Source Code is in the Public Domain per: http://unlicense.org
package org.litesoft.GWT.forms.client.components.nonpublic;

import org.litesoft.GWT.client.widgets.Button;
import org.litesoft.GWT.client.widgets.*;

import com.google.gwt.dom.client.*;
import com.google.gwt.event.dom.client.*;
import com.google.gwt.user.client.ui.*;

public class DialogButtonPanel extends HorizontalPanel
{
    private Button[] mButtons;

    public DialogButtonPanel( ClickHandler pClickHandler, Button... pButtons )
    {
        boolean anyAdded = false;
        if ( null != (mButtons = pButtons) )
        {
            for ( Button zButton : pButtons )
            {
                if ( zButton != null )
                {
                    if ( anyAdded )
                    {
                        add( new Spacer( 5 ) );
                    }
                    zButton.addClickHandler( pClickHandler );
                    add( zButton );
                    anyAdded = true;
                }
            }
        }
        if ( !anyAdded )
        {
            throw new IllegalArgumentException( "No Buttons on the DialogButtonPanel" );
        }
        getElement().getStyle().setMarginTop( 2, Style.Unit.PX ); // todo: Warning can mess up Sizeing
    }

    public boolean isOurButton( Widget pSender )
    {
        for ( Button zButton : mButtons )
        {
            if ( pSender == zButton )
            {
                return true;
            }
        }
        return false;
    }

    private Button buildButton( String[] pButtonTexts, int pIndex, ClickHandler pClickHandler )
    {
        String zText = pButtonTexts[pIndex];
        if ( zText == null )
        {
            return null;
        }
        DefButtonNamedTypedAbstractTextable zDefButton;

        if ( pButtonTexts.length == 1 )
        {
            zDefButton = Button.named( "DialogButtonOnly" ).green();
        }
        else if ( (pButtonTexts.length - 1) == pIndex )
        {
            zDefButton = Button.named( "DialogButtonLast" ).green();
        }
        else if ( pIndex == 0 )
        {
            zDefButton = Button.named( "DialogButtonFirst" ).red();
        }
        else
        {
            zDefButton = Button.named( "DialogButtonMiddle" ).blue();
        }
        return zDefButton.text( zText ).add( pClickHandler ).create();
    }

    @Override
    protected void onAttach()
    {
        super.onAttach();
        sizeAllButtons( mButtons );
    }

    public static void sizeAllButtons( Button[] pButtons )
    {
        boolean zAllSame = true;
        int zFirstAt = -1;
        int zMaxWidth = 0;
        Integer[] zWidths = new Integer[pButtons.length];
        for ( int i = 0; i < pButtons.length; i++ )
        {
            Button zButton = pButtons[i];
            if ( zButton != null )
            {
                int zWidth = zButton.getOffsetWidth();
                if ( zWidth < 1 )
                {
                    System.err.println( "************** DialogButtonPanel.sizeAllButtons **************" );
                    return;
                }
                zWidths[i] = zWidth;
                if ( zAllSame )
                {
                    if ( zFirstAt == -1 )
                    {
                        zFirstAt = i;
                        zMaxWidth = zWidth;
                    }
                    else if ( !(zAllSame = zWidth == zWidths[zFirstAt]) )
                    {
                        zMaxWidth = Math.max( zMaxWidth, zWidth );
                    }
                }
            }
        }
        if ( !zAllSame )
        {
            for ( int i = 0; i < pButtons.length; i++ )
            {
                Integer zWidth = zWidths[i];
                if ( (zWidth != null) && (zMaxWidth != zWidth) )
                {
                    pButtons[i].setWidth( "" + zMaxWidth );
                }
            }
        }
    }
}