// 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.*;
import org.litesoft.GWT.client.widgets.nonpublic.*;
import org.litesoft.commonfoundation.base.*;
import org.litesoft.commonfoundation.html.*;
import org.litesoft.core.*;
import org.litesoft.uispecification.*;

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

public abstract class AbstractFocusWidgetFormElement extends AbstractFormElement implements FocusHandler,
                                                                                            BlurHandler {
    protected final Widget mInputWidget;
    protected IndicatorTd mIndicatorTd = null;
    protected Label mLabel = null;

    protected AbstractFocusWidgetFormElement( IFocusWidget pInputWidget, String pWidgetStyle, boolean pAddStyle ) {
        super( DOM.createDiv() );
        mInputWidget = (Widget) pInputWidget;
        if ( pAddStyle ) {
            mInputWidget.addStyleName( pWidgetStyle );
        } else {
            mInputWidget.setStyleName( pWidgetStyle );
        }
    }

    protected void initialize( String pFieldLabel, UiFont pLabelFont, String pTooltip ) {
        mFieldLabel = pFieldLabel;
        mTooltip = pTooltip;

        buildComponentPanel( (pFieldLabel != null) ? HTMLize.escapeNoWrap( pFieldLabel ) : null, pLabelFont );

        IFocusWidget zWidget = (IFocusWidget) mInputWidget;
        zWidget.addFocusHandler( this );
        zWidget.addBlurHandler( this );

        if ( mIndicatorTd != null ) {
            mIndicatorTd.setTitle( pTooltip );
        }
    }

    protected int buildComponentPanel( String pLabel, UiFont pLabelFont ) {
        int zUniqueID = StaticSimpleIdSource.getNext();
        String trId = "tr_" + zUniqueID;
        String inputId = "input_" + zUniqueID;
        String labelId = "label_" + zUniqueID;
        String html = "<table cellpadding='0' cellspacing='0'>" + //
                      buildInputRow( trId, inputId, zUniqueID ) + //
                      "</table>";

        if ( pLabel != null ) {
            ApplyFont.to( pLabelFont, mLabel = new Label() );
            mLabel.addStyleName( FORM_COMPONENT_LABEL_STYLE );
            DOM.setInnerHTML( mLabel.getElement(), pLabel );
            html = "<table cellpadding='0' cellspacing='0'>" + //
                   "<tr><td id='" + labelId + "'></td></tr>" + //
                   "<tr><td>" + html + "</td></tr></table>";
        }

        initializeHTML( html );

        mInnerHTMLpanel.add( getInjectedInputWidget(), inputId );
        addIndicator( trId );
        if ( mLabel != null ) {
            mInnerHTMLpanel.add( mLabel, labelId );
        }
        return zUniqueID;
    }

    protected String buildInputRow( String pTrId, String pInputId, int pUniqueID ) {
        return buildInputRowWithOptionalCell( pTrId, pInputId, "" );
    }

    protected void addIndicator( String pTrId ) {
        mInnerHTMLpanel.add( mIndicatorTd = new IndicatorTd(), pTrId );
    }

    protected String buildInputRowWithOptionalCell( String pTrId, String pInputId, String pAdditionalInputCell ) {
        return "<tr id='" + pTrId + "' class='litesoft-FormComponentInputRow'><td id='" + pInputId + "'></td>" + pAdditionalInputCell + "</tr>";
    }

    protected Widget getInjectedInputWidget() {
        return mInputWidget;
    }

    // IFormComponent

    @Override
    public boolean setFocus() {
        if ( mInputWidget instanceof Focusable ) {
            pullFocusTo( (Focusable) mInputWidget );
            return true;
        }
        return false;
    }

    @Override
    public void setEnabled( boolean pEnabled ) {
        mEnabled = pEnabled;
        ((IFocusWidget) mInputWidget).setEnabled( pEnabled );
        stateChanged();
    }

    // Focus & Blur Handlers

    @Override
    public void onFocus( FocusEvent event ) {
        fireFocusListeners();
    }

    @Override
    public void onBlur( BlurEvent event ) {
        fireBlurListeners();
    }

    // Support...

    public static class IndicatorTd extends Widget {
        public IndicatorTd() {
            Element td = DOM.createTD();
            CommonElementHelper.setStyleClass( td, "litesoft-FormComponentIndicatorContainer" );
            DOM.setElementProperty( td, "align", "center" );

            setElement( td );

            Element icon = DOM.createDiv();
            CommonElementHelper.setStyleClass( icon, "litesoft-FormComponentIndicator" );
            DOM.setStyleAttribute( icon, "fontSize", "0" );

            DOM.appendChild( td, icon );

            setVisible( false );
        }

        @Override
        public void setTitle( String title ) {
            title = ConstrainTo.significantOrNull( title );
            if ( title == null ) {
                super.setTitle( "" );
                setVisible( false );
            } else {
                super.setTitle( title );
                setVisible( true );
            }
        }

        /**
         * Overrides super impl to allow TD to take up space while not showing.
         */
        @Override
        public void setVisible( boolean visible ) {
            CommonElementHelper.setHidden( getElement(), !visible );
        }
    }
}