/*
 * Copyright 2010 JBoss Inc
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.drools.guvnor.client.modeldriven.ui;

import org.drools.guvnor.client.common.DirtyableHorizontalPane;
import org.drools.guvnor.client.common.FormStylePopup;
import org.drools.guvnor.client.common.ImageButton;
import org.drools.guvnor.client.common.InfoPopup;
import org.drools.guvnor.client.messages.Constants;
import org.drools.guvnor.client.resources.Images;
import org.drools.ide.common.client.modeldriven.brl.RuleAttribute;
import org.drools.ide.common.client.modeldriven.brl.RuleMetadata;
import org.drools.ide.common.client.modeldriven.brl.RuleModel;

import com.google.gwt.core.client.GWT;
import com.google.gwt.event.dom.client.ChangeEvent;
import com.google.gwt.event.dom.client.ChangeHandler;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.user.client.Command;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.HorizontalPanel;
import com.google.gwt.user.client.ui.Image;
import com.google.gwt.user.client.ui.ListBox;
import com.google.gwt.user.client.ui.TextBox;

/**
 * 
 * @author rikkola
 *
 */
public class AttributeSelectorPopup extends FormStylePopup {

    private static Constants constants = GWT.create( Constants.class );
    private static Images    images    = GWT.create( Images.class );

    private final ListBox    list      = RuleAttributeWidget.getAttributeList();

    private final TextBox    box       = new TextBox();

    public AttributeSelectorPopup(final RuleModel model,
                                  boolean lockLHS,
                                  boolean lockRHS,
                                  final Command refresh) {
        super( images.config(),
               constants.AddAnOptionToTheRule() );

        setTextBox( model,
                    refresh );

        setListBox( model,
                    refresh );

        setFreezePanel( model,
                        lockLHS,
                        lockRHS,
                        refresh );

    }

    private void setTextBox(final RuleModel model,
                            final Command refresh) {
        box.setVisibleLength( 15 );

        DirtyableHorizontalPane horiz = new DirtyableHorizontalPane();
        horiz.add( box );
        horiz.add( getAddButton( model,
                                 refresh,
                                 box ) );

        addAttribute( constants.Metadata3(),
                      horiz );

    }

    private void setListBox(final RuleModel model,
                            final Command refresh) {
        list.setSelectedIndex( 0 );

        list.addChangeHandler( new ChangeHandler() {
            public void onChange(ChangeEvent event) {
                String attr = list.getItemText( list.getSelectedIndex() );
                if ( attr.equals( RuleAttributeWidget.LOCK_LHS ) || attr.equals( RuleAttributeWidget.LOCK_RHS ) ) {
                    model.addMetadata( new RuleMetadata( attr,
                                                         "true" ) );
                } else {
                    model.addAttribute( new RuleAttribute( attr,
                                                           "" ) );
                }
                refresh.execute();
                hide();
            }
        } );
        addAttribute( constants.Attribute1(),
                      list );

    }

    private void setFreezePanel(final RuleModel model,
                                boolean lockLHS,
                                boolean lockRHS,
                                final Command refresh) {
        Button freezeConditions = new Button( constants.Conditions() );
        freezeConditions.addClickHandler( new ClickHandler() {

            public void onClick(ClickEvent event) {
                model.addMetadata( new RuleMetadata( RuleAttributeWidget.LOCK_LHS,
                                                     "true" ) );
                refresh.execute();
                hide();
            }
        } );
        Button freezeActions = new Button( constants.Actions() );
        freezeActions.addClickHandler( new ClickHandler() {

            public void onClick(ClickEvent event) {
                model.addMetadata( new RuleMetadata( RuleAttributeWidget.LOCK_RHS,
                                                     "true" ) );
                refresh.execute();
                hide();
            }
        } );
        HorizontalPanel hz = new HorizontalPanel();
        if ( !lockLHS ) {
            hz.add( freezeConditions );
        }
        if ( !lockRHS ) {
            hz.add( freezeActions );
        }
        hz.add( new InfoPopup( constants.FrozenAreas(),
                               constants.FrozenExplanation() ) );

        if ( hz.getWidgetCount() > 1 ) {
            addAttribute( constants.FreezeAreasForEditing(),
                          hz );
        }
    }

    private Image getAddButton(final RuleModel model,
                               final Command refresh,
                               final TextBox box) {
        final Image addbutton = new ImageButton( images.newItem() );
        addbutton.setTitle( constants.AddMetadataToTheRule() );

        addbutton.addClickHandler( new ClickHandler() {

            public void onClick(ClickEvent event) {

                model.addMetadata( new RuleMetadata( box.getText(),
                                                     "" ) );
                refresh.execute();
                hide();
            }
        } );
        return addbutton;
    }

}