/*******************************************************************************
 * Copyright (c) 2000, 2020 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.ant.internal.ui.launchConfigurations;

import org.eclipse.debug.ui.StringVariableSelectionDialog;
import org.eclipse.jface.dialogs.Dialog;
import org.eclipse.jface.dialogs.IDialogConstants;
import org.eclipse.jface.dialogs.IDialogSettings;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;
import org.eclipse.ui.PlatformUI;
import org.osgi.framework.FrameworkUtil;

public class VariableInputDialog extends Dialog {

	private static String DIALOG_SETTINGS_SECTION = "RuntimeClasspathAction.VariableInputDialog"; //$NON-NLS-1$
	private Text fText;
	private String fVariableString;

	public VariableInputDialog(Shell shell) {
		super(shell);
		setShellStyle(SWT.RESIZE | getShellStyle());
	}

	@Override
	protected Control createDialogArea(Composite parent) {
		Composite inner = (Composite) super.createDialogArea(parent);
		((GridLayout) inner.getLayout()).numColumns = 2;

		Label label = new Label(inner, SWT.NONE);
		label.setText(AntLaunchConfigurationMessages.AddVariableStringAction_2);
		GridData gd = new GridData(GridData.HORIZONTAL_ALIGN_BEGINNING);
		gd.horizontalSpan = 2;
		label.setLayoutData(gd);

		fText = new Text(inner, SWT.SINGLE | SWT.BORDER);
		gd = new GridData(GridData.FILL_HORIZONTAL);
		gd.grabExcessHorizontalSpace = true;
		gd.widthHint = 200;
		fText.setLayoutData(gd);

		Button button = new Button(inner, SWT.PUSH);
		button.setText(AntLaunchConfigurationMessages.AddVariableStringAction_3);
		button.addSelectionListener(new SelectionAdapter() {
			@Override
			public void widgetSelected(SelectionEvent se) {
				getVariable();
			}
		});

		applyDialogFont(parent);
		return inner;
	}

	@Override
	protected void createButtonsForButtonBar(Composite parent) {
		createButton(parent, IDialogConstants.OK_ID, IDialogConstants.OK_LABEL, true);
		createButton(parent, IDialogConstants.CANCEL_ID, IDialogConstants.CANCEL_LABEL, false);
	}

	@Override
	protected void configureShell(Shell newShell) {
		super.configureShell(newShell);
		newShell.setText(AntLaunchConfigurationMessages.AddVariableStringAction_4);
	}

	private void getVariable() {
		StringVariableSelectionDialog variableDialog = new StringVariableSelectionDialog(getShell());
		int returnCode = variableDialog.open();
		if (returnCode == IDialogConstants.OK_ID) {
			String variable = variableDialog.getVariableExpression();
			if (variable != null) {
				fText.insert(variable);
			}
		}
	}

	@Override
	protected void okPressed() {
		String variableString = fText.getText();
		if (variableString != null && variableString.trim().length() > 0) {
			fVariableString = variableString;
		} else {
			fVariableString = null;
		}
		super.okPressed();
	}

	public String getVariableString() {
		return fVariableString;
	}

	@Override
	protected IDialogSettings getDialogBoundsSettings() {
		IDialogSettings settings = PlatformUI.getDialogSettingsProvider(FrameworkUtil.getBundle(VariableInputDialog.class)).getDialogSettings();
		IDialogSettings section = settings.getSection(DIALOG_SETTINGS_SECTION);
		if (section == null) {
			section = settings.addNewSection(DIALOG_SETTINGS_SECTION);
		}
		return section;
	}
}