/*******************************************************************************
 * Copyright (c) 2000, 2005 IBM Corporation 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:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.update.internal.ui.security;

import org.eclipse.jface.dialogs.*;
import org.eclipse.jface.dialogs.Dialog;
import org.eclipse.swt.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;
import org.eclipse.ui.*;
import org.eclipse.update.internal.ui.*;

/**
 * User authentication dialog
 */
public class UserValidationDialog extends Dialog {
    protected Text usernameField;
    protected Text passwordField;

    protected String host;
    protected String message;
    protected Authentication userAuthentication = null;
    /**
     * Gets user and password from a user. May be called from any thread
     * 
     * @return UserAuthentication that contains the userid and the password or
     *         <code>null</code> if the dialog has been cancelled
     */
    public static Authentication getAuthentication(final String host,
            final String message) {
        class UIOperation implements Runnable {
            public Authentication authentication;
            public void run() {
                authentication = UserValidationDialog.askForAuthentication(
                        host, message);
            }
        }

        UIOperation uio = new UIOperation();
        if (Display.getCurrent() != null) {
            uio.run();
        } else {
            Display.getDefault().syncExec(uio);
        }
        return uio.authentication;
    }
    /**
     * Gets user and password from a user Must be called from UI thread
     * 
     * @return UserAuthentication that contains the userid and the password or
     *         <code>null</code> if the dialog has been cancelled
     */
    protected static Authentication askForAuthentication(String host,
            String message) {
        UserValidationDialog ui = new UserValidationDialog(null, host, message); 
        ui.open();
        return ui.getAuthentication();
    }
    /**
     * Creates a new UserValidationDialog.
     * 
     * @param parentShell
     *            parent Shell or null
     */
    protected UserValidationDialog(Shell parentShell, String host,
            String message) {
        super(parentShell);
        this.host = host;
        this.message = message;
        setBlockOnOpen(true);
    }
    /**
     */
    protected void configureShell(Shell newShell) {
        super.configureShell(newShell);
        newShell.setText(UpdateUIMessages.UserVerificationDialog_PasswordRequired); 
    }
    /**
     */
    public void create() {
        super.create();
        //give focus to username field
        usernameField.selectAll();
        usernameField.setFocus();
    }
    /**
     */
    protected Control createDialogArea(Composite parent) {
        Composite main = new Composite(parent, SWT.NONE);
        GridLayout layout = new GridLayout();
        layout.numColumns = 3;
        main.setLayout(layout);
        main.setLayoutData(new GridData(GridData.FILL_BOTH));

        Label label = new Label(main, SWT.WRAP);
        String text = UpdateUIMessages.UserVerificationDialog_ConnectTo + host; 
        text += "\n\n" + message; //$NON-NLS-1$ 
        label.setText(text);
        GridData data = new GridData(GridData.FILL_HORIZONTAL);
        data.horizontalSpan = 3;
        label.setLayoutData(data);

        createUsernameFields(main);
        createPasswordFields(main);
        PlatformUI.getWorkbench().getHelpSystem().setHelp(main,
                "org.eclipse.update.ui.UserValidationDialog"); //$NON-NLS-1$
        return main;
    }
    /**
     * Creates the three widgets that represent the user name entry area.
     */
    protected void createPasswordFields(Composite parent) {
        new Label(parent, SWT.NONE).setText(UpdateUIMessages.UserVerificationDialog_Password); 

        passwordField = new Text(parent, SWT.BORDER | SWT.PASSWORD);
        GridData data = new GridData(GridData.FILL_HORIZONTAL);
        data.widthHint = convertHorizontalDLUsToPixels(IDialogConstants.ENTRY_FIELD_WIDTH);
        passwordField.setLayoutData(data);

        new Label(parent, SWT.NONE); //spacer
    }
    /**
     * Creates the three widgets that represent the user name entry area.
     */
    protected void createUsernameFields(Composite parent) {
        new Label(parent, SWT.NONE).setText(UpdateUIMessages.UserVerificationDialog_UserName); 

        usernameField = new Text(parent, SWT.BORDER);
        GridData data = new GridData(GridData.FILL_HORIZONTAL);
        data.widthHint = convertHorizontalDLUsToPixels(IDialogConstants.ENTRY_FIELD_WIDTH);
        usernameField.setLayoutData(data);

        new Label(parent, SWT.NONE); //spacer
    }
    /**
     * Returns the UserAuthentication entered by the user, or null if the user
     * canceled.
     */
    public Authentication getAuthentication() {
        return userAuthentication;
    }
    /**
     * Notifies that the ok button of this dialog has been pressed.
     */
    protected void okPressed() {
        userAuthentication = new Authentication(usernameField.getText(),
                passwordField.getText());
        super.okPressed();
    }

}