/*******************************************************************************
 * Copyright (c) 2003, 2016 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
 *     John J Barton 2008, Bug 248516 - [Browser] Update Window > Pref > General >Web Browsers UI
 *******************************************************************************/
package org.eclipse.ui.internal.browser;

import java.io.File;

import org.eclipse.jface.dialogs.Dialog;
import org.eclipse.jface.dialogs.IDialogConstants;
import org.eclipse.jface.util.Util;
import org.eclipse.osgi.util.NLS;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.graphics.Font;
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.FileDialog;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;
import org.eclipse.ui.PlatformUI;

/**
 *
 */
public class BrowserDescriptorDialog extends Dialog {
	protected IBrowserDescriptorWorkingCopy browser;
	protected boolean isEdit;
	protected Button newPageCheckbox;
	protected Button clearHistoryCheckbox;
	protected Button browseButton;
	protected Text browserNameTextfield;
	protected Text browserLocationTextfield;
	protected Text browserParametersTextfield;
	private Button okButton;

	interface StringModifyListener {
		public void valueChanged(String s);
	}

	public BrowserDescriptorDialog(Shell parentShell, IBrowserDescriptorWorkingCopy browser) {
		super(parentShell);
		this.browser = browser;
		isEdit = true;
		setShellStyle( getShellStyle() | SWT.RESIZE );
	}

	public BrowserDescriptorDialog(Shell parentShell) {
		super(parentShell);
		browser = BrowserManager.getInstance().createExternalWebBrowser();
		isEdit = false;
		setShellStyle( getShellStyle() | SWT.RESIZE );
	}

	@Override
	protected void configureShell(Shell shell) {
		super.configureShell(shell);

		if (isEdit)
			shell.setText(Messages.editExternalBrowser);
		else
			shell.setText(Messages.createBrowser);
	}

	protected Text createText(Composite comp, String txt, final StringModifyListener listener, boolean multiLine) {
		int style = SWT.BORDER;
		if (multiLine) {
			style = SWT.BORDER | SWT.V_SCROLL | SWT.MULTI | SWT.WRAP;
		}
		final Text text = new Text(comp, style);
		if (multiLine) {
			text.addTraverseListener(event -> {
				switch (event.detail) {
				case SWT.TRAVERSE_RETURN:
				case SWT.TRAVERSE_TAB_NEXT:
				case SWT.TRAVERSE_TAB_PREVIOUS:
					event.doit = true;
					break;
				}
			});
		}
		// final Text text = SWTUtil.createMultilineText(comp, style);
		if (txt != null)
			text.setText(txt);

		GridData data = new GridData(SWT.FILL, SWT.CENTER, true, false);
		data.widthHint = 450;

		if (multiLine) { // then expand this control as the dialog resizes
			data.verticalAlignment= SWT.FILL;
			data.grabExcessVerticalSpace = true;
			data.heightHint = convertHeightInCharsToPixels(4);
		}

		text.setLayoutData(data);
		if (listener != null)
			text.addModifyListener(e -> listener.valueChanged(text.getText()));
		return text;
	}

	@Override
	protected Control createDialogArea(Composite parent) {
		Font font = parent.getFont();
		Composite composite = (Composite) super.createDialogArea(parent);
		((GridLayout)composite.getLayout()).numColumns = 3;
		composite.setFont(font);

		PlatformUI.getWorkbench().getHelpSystem().setHelp(composite, ContextIds.PREF_BROWSER_DIALOG);

		SWTUtil.createLabel(composite, Messages.name).setFont(font);
		browserNameTextfield = createText(composite, browser.getName(), s -> {
			browser.setName(s);
			validateFields();
		}, false);
		browserNameTextfield.setFont(font);

		new Label(composite, SWT.NONE);

		SWTUtil.createLabel(composite, Messages.location).setFont(font);
		browserLocationTextfield = createText(composite, browser.getLocation(), s -> {
			browser.setLocation(s);
			validateFields();
		}, false);
		browserLocationTextfield.setFont(font);

		browseButton = SWTUtil.createButton(composite, Messages.browse);
		browseButton.setFont(font);
		browseButton.addSelectionListener(SelectionListener.widgetSelectedAdapter(e -> {
			FileDialog dialog = new FileDialog(getShell(), SWT.OPEN | SWT.SHEET);
			dialog.setText(Messages.browseMessage);

			String fname = browserLocationTextfield.getText();

			dialog.setFileName(fname);
			fname = dialog.open();

			if (fname != null)
				browserLocationTextfield.setText(fname);
		}));

		SWTUtil.createLabel(composite, Messages.parameters).setFont(font);
		browserParametersTextfield = createText(composite, browser.getParameters(), browser::setParameters,
				true);
		browserParametersTextfield.setFont(font);

		new Label(composite, SWT.NONE);

		new Label(composite, SWT.NONE);
		Label urlLabel = new Label(composite, SWT.NONE);
		urlLabel.setText(NLS.bind(Messages.parametersMessage, IBrowserDescriptor.URL_PARAMETER));
		urlLabel.setFont(font);

		return composite;
	}

	@Override
	protected void okPressed() {
		// do simple field validation to at least ensure target directory entered is valid pathname
		try {
			File file = new File(browser.getLocation());
			if (!(file.isFile() || (Util.isMac() && ExternalBrowserInstance.isMacAppBundle(file)))) {
				WebBrowserUtil.openError(Messages.locationInvalid);
				return;
			}
		}
		catch(Exception e){
			WebBrowserUtil.openError(Messages.locationInvalid);
			return;
		}

		browser.save();
		super.okPressed();
	}

	private void setOKButtonEnabled(boolean curIsEnabled) {
		if (okButton == null)
			okButton = getButton(IDialogConstants.OK_ID);

		if (okButton != null)
			okButton.setEnabled(curIsEnabled);
	}

	@Override
	protected Control createButtonBar(Composite parent) {
		Control buttonControl = super.createButtonBar(parent);
		validateFields();
		return buttonControl;
	}

	protected void validateFields() {
		boolean valid = true;

		String name = browserNameTextfield.getText();
		if (name == null || name.trim().length() < 1)
			valid = false;

		String location = browserLocationTextfield.getText();
		if (location == null || location.trim().length() < 1)
			valid = false;

		setOKButtonEnabled(valid);
	}
}
