/*******************************************************************************
 * Copyright (c) 2012 Original authors and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     Original authors and others - initial API and implementation
 ******************************************************************************/
package org.eclipse.nebula.widgets.nattable.columnChooser.gui;

import org.eclipse.core.runtime.ListenerList;
import org.eclipse.jface.dialogs.Dialog;
import org.eclipse.jface.dialogs.IDialogConstants;
import org.eclipse.jface.dialogs.IDialogSettings;
import org.eclipse.jface.layout.GridDataFactory;
import org.eclipse.nebula.widgets.nattable.Messages;
import org.eclipse.nebula.widgets.nattable.util.GUIHelper;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Shell;

public abstract class AbstractColumnChooserDialog extends Dialog {

    protected ListenerList listeners = new ListenerList();
    private IDialogSettings dialogSettings;;

    public AbstractColumnChooserDialog(Shell parent) {
        super(parent);
        setShellStyle(SWT.CLOSE | SWT.TITLE | SWT.BORDER
                | SWT.APPLICATION_MODAL | SWT.RESIZE);
    }

    @Override
    protected void createButtonsForButtonBar(Composite parent) {
        createButton(
                parent,
                IDialogConstants.OK_ID,
                Messages.getString("AbstractColumnChooserDialog.doneButton"), true); //$NON-NLS-1$
    }

    @Override
    protected Control createDialogArea(Composite parent) {
        Composite composite = (Composite) super.createDialogArea(parent);

        GridDataFactory.fillDefaults().grab(true, true).applyTo(composite);

        composite.setLayout(new GridLayout(1, true));

        composite.getShell().setText(
                Messages.getString("AbstractColumnChooserDialog.shellTitle")); //$NON-NLS-1$
        composite.getShell().setImage(GUIHelper.getImage("preferences")); //$NON-NLS-1$

        populateDialogArea(composite);

        Label separator = new Label(composite, SWT.SEPARATOR | SWT.HORIZONTAL);
        GridDataFactory.fillDefaults().grab(true, false)
                .span(((GridLayout) composite.getLayout()).numColumns, 1)
                .applyTo(separator);

        return composite;
    }

    protected abstract void populateDialogArea(Composite composite);

    protected void createLabels(Composite parent, String availableStr,
            String selectedStr) {
        boolean availableSet = availableStr != null && availableStr.length() > 0;
        boolean selectedSet = selectedStr != null && selectedStr.length() > 0;

        if (availableSet && selectedSet) {
            if (availableSet) {
                Label availableLabel = new Label(parent, SWT.NONE);
                availableLabel.setText(availableStr);
                GridDataFactory.swtDefaults().applyTo(availableLabel);
            }

            Label filler = new Label(parent, SWT.NONE);
            GridDataFactory.swtDefaults().span(availableSet ? 1 : 2, 1)
                    .applyTo(filler);

            if (selectedSet) {
                Label selectedLabel = new Label(parent, SWT.NONE);
                selectedLabel.setText(selectedStr);
                GridDataFactory.swtDefaults().span(2, 1).applyTo(selectedLabel);
            }
        }
    }

    public void addListener(Object listener) {
        this.listeners.add(listener);
    }

    public void removeListener(Object listener) {
        this.listeners.remove(listener);
    }

    @Override
    protected Point getInitialSize() {
        if (this.dialogSettings == null) {
            return new Point(500, 350);
        }
        Point initialSize = super.getInitialSize();
        return initialSize.x < 500 && initialSize.y < 350 ? new Point(500, 350)
                : initialSize;
    }

    public void setDialogSettings(IDialogSettings dialogSettings) {
        this.dialogSettings = dialogSettings;
    }

    @Override
    protected IDialogSettings getDialogBoundsSettings() {
        return this.dialogSettings;
    }
}