package org.cookbook.ch13.EditorPlugIn.wizards;

import org.eclipse.jface.wizard.WizardPage;
import org.eclipse.swt.widgets.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.SWT;
import org.eclipse.core.resources.*;
import org.eclipse.core.runtime.Path;
import org.eclipse.swt.events.*;
import org.eclipse.ui.dialogs.ContainerSelectionDialog;
import org.eclipse.jface.viewers.*;

/**
 * The "New" wizard page allows setting the container for
 * the new file as well as the file name. The page
 * will only accept file name without the extension OR
 * with the extension that matches the expected one (new).
 */

public class SampleNewWizardPage extends WizardPage {
	private Text containerText;
	private Text fileText;
	private ISelection selection;

	/**
	 * Constructor for SampleNewWizardPage.
	 * @param pageName
	 */
	public SampleNewWizardPage(ISelection selection) {
		super("wizardPage");
		setTitle("Multi-page Editor File");
		setDescription("This wizard creates a new file with *.new extension that can be opened by a multi-page editor.");
		this.selection = selection;
	}

	/**
	 * @see IDialogPage#createControl(Composite)
	 */
	public void createControl(Composite parent) {
		Composite container = new Composite(parent, SWT.NULL);
		GridLayout layout = new GridLayout();
		container.setLayout(layout);
		layout.numColumns = 3;
		layout.verticalSpacing = 9;
		Label label = new Label(container, SWT.NULL);
		label.setText("&Container:");

		containerText = new Text(container, SWT.BORDER | SWT.SINGLE);
		GridData gd = new GridData(GridData.FILL_HORIZONTAL);
		containerText.setLayoutData(gd);
		containerText.addModifyListener(new ModifyListener() {
			public void modifyText(ModifyEvent e) {
				dialogChanged();
			}
		});

		Button button = new Button(container, SWT.PUSH);
		button.setText("Browse...");
		button.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent e) {
				handleBrowse();
			}
		});
		label = new Label(container, SWT.NULL);
		label.setText("&File name:");

		fileText = new Text(container, SWT.BORDER | SWT.SINGLE);
		gd = new GridData(GridData.FILL_HORIZONTAL);
		fileText.setLayoutData(gd);
		fileText.addModifyListener(new ModifyListener() {
			public void modifyText(ModifyEvent e) {
				dialogChanged();
			}
		});
		initialize();
		dialogChanged();
		setControl(container);
	}
	
	/**
	 * Tests if the current workbench selection is a suitable
	 * container to use.
	 */
	
	private void initialize() {
		if (selection!=null && selection.isEmpty()==false && selection instanceof IStructuredSelection) {
			IStructuredSelection ssel = (IStructuredSelection)selection;
			if (ssel.size()>1) return;
			Object obj = ssel.getFirstElement();
			if (obj instanceof IResource) {
				IContainer container;
				if (obj instanceof IContainer)
					container = (IContainer)obj;
				else
					container = ((IResource)obj).getParent();
				containerText.setText(container.getFullPath().toString());
			}
		}
		fileText.setText("document.new");
	}
	
	/**
	 * Uses the standard container selection dialog to
	 * choose the new value for the container field.
	 */

	private void handleBrowse() {
		ContainerSelectionDialog dialog =
			new ContainerSelectionDialog(
				getShell(),
				ResourcesPlugin.getWorkspace().getRoot(),
				false,
				"Select new file container");
		if (dialog.open() == ContainerSelectionDialog.OK) {
			Object[] result = dialog.getResult();
			if (result.length == 1) {
				containerText.setText(((Path)result[0]).toOSString());
			}
		}
	}
	
	/**
	 * Ensures that both text fields are set.
	 */

	private void dialogChanged() {
		String container = getContainerName();
		String fileName = getFileName();

		if (container.length() == 0) {
			updateStatus("File container must be specified");
			return;
		}
		if (fileName.length() == 0) {
			updateStatus("File name must be specified");
			return;
		}
		int dotLoc = fileName.indexOf('.');
		if (dotLoc != -1) {
			String ext = fileName.substring(dotLoc + 1);
			if (ext.equalsIgnoreCase("new") == false) {
				updateStatus("File extension must be \"new\"");
				return;
			}
		}
		updateStatus(null);
	}

	private void updateStatus(String message) {
		setErrorMessage(message);
		setPageComplete(message == null);
	}

	public String getContainerName() {
		return containerText.getText();
	}
	public String getFileName() {
		return fileText.getText();
	}
}