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package org.openjdk.jmc.ui.wizards;

import org.eclipse.jface.dialogs.IDialogConstants;
import org.eclipse.jface.dialogs.IDialogSettings;
import org.eclipse.jface.dialogs.TitleAreaDialog;
import org.eclipse.jface.wizard.IWizardPage;
import org.eclipse.jface.wizard.WizardDialog;
import org.eclipse.jface.wizard.WizardPage;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;

import org.openjdk.jmc.ui.misc.DisplayToolkit;

/**
 * Wizard that wraps an {@link IWizardPage} so it looks like an ordinary {@link TitleAreaDialog}.
 * Benefits of using a wizard page instead of deriving from {@link TitleAreaDialog} is that the page
 * can be reused in an ordinary wizard.
 * <p>
 * This class also takes care of window title, shell image, placement.
 * <p>
 * If the {@link IWizardPage} implements {@link IPerformFinishable} the method
 * {@link IPerformFinishable#performFinish()} is called when the user presses OK.
 */
public class OnePageWizardDialog extends SizeConstrainedWizardDialog {
	private Image m_image;
	private boolean m_setFinishButtonAsOK = true;
	private boolean m_hideCancelButton;

	/**
	 * Creates a {@link WizardDialog} with only one {@link WizardPage}
	 *
	 * @param shell
	 *            the shell
	 * @param page
	 *            the {@link WizardPage}
	 * @param image
	 *            the image to use for the window
	 * @param title
	 *            the window title
	 */
	public OnePageWizardDialog(Shell shell, IWizardPage page) {
		super(shell, new OnePageWizard(page));
	}

	public OnePageWizardDialog(Shell shell, IWizardPage page, Image image) {
		super(shell, new OnePageWizard(page));
		m_image = image;
	}

	public void setDialogSettings(IDialogSettings settings) {
		getOnePageWizard().setDialogSettings(settings);
	}

	public IDialogSettings getDialogSettings() {
		return getOnePageWizard().getDialogSettings();
	}

	public IWizardPage getPage() {
		return getOnePageWizard().getPage();
	}

	private OnePageWizard getOnePageWizard() {
		return (OnePageWizard) getWizard();
	}

	public void setFinishButtonLabelAsOK(boolean setFinishButtonAsOK) {
		m_setFinishButtonAsOK = setFinishButtonAsOK;
	}

	public void setHideCancelButton(boolean hideCancelButton) {
		m_hideCancelButton = hideCancelButton;
	}

	@Override
	protected Control createContents(Composite parent) {
		Control control = super.createContents(parent);
		if (m_image != null) {
			getShell().setImage(m_image);
		}

		updateShellSize();
		DisplayToolkit.placeDialogInCenter(getParentShell(), getShell());
		if (m_setFinishButtonAsOK) {
			getButton(IDialogConstants.FINISH_ID).setText(IDialogConstants.OK_LABEL);
		}
		if (m_hideCancelButton) {
			Button showButton;
			Button hideButton;
			if (parent.getDisplay().getDismissalAlignment() == SWT.RIGHT) {
				// Linux
				showButton = getButton(IDialogConstants.FINISH_ID);
				hideButton = getButton(IDialogConstants.CANCEL_ID);
			} else {
				// Windows
				showButton = getButton(IDialogConstants.CANCEL_ID);
				hideButton = getButton(IDialogConstants.FINISH_ID);
			}
			hideButton.setVisible(false);
			showButton.setText(IDialogConstants.OK_LABEL);
			showButton.setFocus();
		}

		return control;
	}

	public boolean performFinish() {
		return getWizard().performFinish();
	}

	public static int open(IWizardPage wp, int width, int height) {
		OnePageWizardDialog d = new OnePageWizardDialog(Display.getCurrent().getActiveShell(), wp);
		d.setWidthConstraint(width, width);
		d.setHeightConstraint(height, height);
		return d.open();
	}

	public static int openAndHideCancelButton(IWizardPage wp, int width, int height) {
		OnePageWizardDialog d = new OnePageWizardDialog(Display.getCurrent().getActiveShell(), wp);
		d.setHideCancelButton(true);
		d.setWidthConstraint(width, width);
		d.setHeightConstraint(height, height);
		return d.open();
	}
}