package org.python.pydev.ui.dialogs;

/******************************************************************************* 
 * Copyright (c) 2000, 2003 IBM Corporation and others. 
 * All rights reserved. This program and the accompanying materials! 
 * are made available under the terms of the Common Public License v1.0 
 * which accompanies this distribution, and is available at 
 * http://www.eclipse.org/legal/cpl-v10.html 
 * 
 * Contributors: 
 *   IBM Corporation - initial API and implementation 
 *   Sebastian Davids <sdavids@gmx.de> - Fix for bug 19346 - Dialog
 *     font should be activated and used by other components.
 * 
 * 
 * copied from org.eclipse.ui.dialogs.ContainerSelectionDialog
 * so that we can just get the current project!
 * 
 *****************************************************************************/

import java.util.ArrayList;
import java.util.List;

import org.eclipse.core.resources.IProject;
import org.eclipse.core.runtime.IPath;
import org.eclipse.jface.resource.JFaceColors;
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.dialogs.ISelectionValidator;
import org.eclipse.ui.dialogs.SelectionDialog;

/**
 * A standard selection dialog which solicits a container resource from the user. The <code>getResult</code> method returns the selected
 * container resource.
 * <p>
 * This class may be instantiated; it is not intended to be subclassed.
 * </p>
 * <p>
 * Example:
 * 
 * <pre>
 * ContainerSelectionDialog dialog = new ContainerSelectionDialog(getShell(), initialSelection, allowNewContainerName(), msg);
 * dialog.open();
 * Object[] result = dialog.getResult();
 * </pre>
 * 
 * </p>
 */
public class ProjectFolderSelectionDialog extends SelectionDialog {
    // the widget group;
    ProjectFolderSelectionGroup group;

    // the root resource to populate the viewer with
    private IProject initialSelection;

    // allow the user to type in a new container name
    private boolean allowNewContainerName = true;

    // the validation message
    Label statusMessage;

    //for validating the selection
    ISelectionValidator validator;

    // show closed projects by default
    private boolean showClosedProjects = true;

    /**
     * Creates a resource container selection dialog rooted at the given resource. All selections are considered valid.
     * 
     * @param parentShell the parent shell
     * @param initialRoot the initial selection in the tree
     * @param allowNewContainerName <code>true</code> to enable the user to type in a new container name, and <code>false</code> to
     *            restrict the user to just selecting from existing ones
     * @param message the message to be displayed at the top of this dialog, or <code>null</code> to display a default message
     */
    public ProjectFolderSelectionDialog(Shell parentShell, IProject initialRoot, boolean allowNewContainerName,
            String message) {
        super(parentShell);
        setTitle("Selection dialog");
        this.initialSelection = initialRoot;
        this.allowNewContainerName = allowNewContainerName;
        setMessage(message);
        setShellStyle(getShellStyle() | SWT.RESIZE);
    }

    /*
     * (non-Javadoc) Method declared on Dialog.
     */
    @Override
    protected Control createDialogArea(Composite parent) {
        // create composite
        Composite area = (Composite) super.createDialogArea(parent);

        Listener listener = new Listener() {
            @Override
            public void handleEvent(Event event) {
                if (statusMessage != null && validator != null) {
                    String errorMsg = validator.isValid(group.getContainerFullPath());
                    if (errorMsg == null || errorMsg.equals("")) { //$NON-NLS-1$
                        statusMessage.setText(""); //$NON-NLS-1$
                        getOkButton().setEnabled(true);
                    } else {
                        statusMessage.setForeground(JFaceColors.getErrorText(statusMessage.getDisplay()));
                        statusMessage.setText(errorMsg);
                        getOkButton().setEnabled(false);
                    }
                }
            }
        };

        // container selection group
        group = new ProjectFolderSelectionGroup(area, listener, allowNewContainerName, getMessage(),
                showClosedProjects, initialSelection);
        if (initialSelection != null) {
            group.setSelectedContainer(initialSelection);
        }

        statusMessage = new Label(parent, SWT.NONE);
        statusMessage.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
        statusMessage.setFont(parent.getFont());

        return dialogArea;
    }

    /**
     * The <code>ContainerSelectionDialog</code> implementation of this <code>Dialog</code> method builds a list of the selected
     * resource containers for later retrieval by the client and closes this dialog.
     */
    @Override
    protected void okPressed() {

        List<IPath> chosenContainerPathList = new ArrayList<IPath>();
        IPath returnValue = group.getContainerFullPath();
        if (returnValue != null)
            chosenContainerPathList.add(returnValue);
        setResult(chosenContainerPathList);
        super.okPressed();
    }

    /**
     * Sets the validator to use.
     * 
     * @param validator A selection validator
     */
    public void setValidator(ISelectionValidator validator) {
        this.validator = validator;
    }

    /**
     * Set whether or not closed projects should be shown in the selection dialog.
     * 
     * @param show Whether or not to show closed projects.
     */
    public void showClosedProjects(boolean show) {
        this.showClosedProjects = show;
    }
}