/*******************************************************************************
 * Copyright (c) 2002 IBM Corporation and others.
 * All rights reserved.   This program and the accompanying materials
 * are made available under the terms of the Common Public License v0.5
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v05.html
 * 
 * Contributors:
 * IBM - Initial API and implementation
 ******************************************************************************/
package org.eclipse.ant.internal.ui;

import java.net.URL;

import org.eclipse.ant.core.AntCorePlugin;
import org.eclipse.jface.dialogs.Dialog;
import org.eclipse.jface.dialogs.IDialogConstants;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.*;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.*;

/**
 * Dialog to prompt the user to add a custom ant task or type.
 */
public class AddTaskDialog extends Dialog {
	protected String title;
	protected String description;
	
	//task/type attributes
	protected String taskName;
	protected String className;
	protected URL library;
	
	//widgets
	protected Button okButton;
	protected Text nameField;
	protected Text classField;
	protected Combo libraryField;
	
	protected URL[] libraryUrls;
	
/**
 * Creates a new task dialog with the given shell and title.
 */
protected AddTaskDialog(Shell parentShell, String title, String description) {
	super(parentShell);
	this.title = title;
	this.description = description;
}
/**
 * @see Window#configureShell(Shell)
 */
protected void configureShell(Shell newShell) {
	super.configureShell(newShell);
	newShell.setText(title);
}
/**
 * @see Dialog#createButtonsForButtonBar(Composite)
 */
protected void createButtonsForButtonBar(Composite parent) {
	okButton = createButton(parent, IDialogConstants.OK_ID, IDialogConstants.OK_LABEL, true);
	createButton(parent, IDialogConstants.CANCEL_ID, IDialogConstants.CANCEL_LABEL, false);
	updateEnablement();
}
/**
 * @see Dialog#createDialogArea(Composite)
 */
protected Control createDialogArea(Composite parent) {
	Composite dialogArea = new Composite(parent, SWT.NONE);
	GridLayout layout = new GridLayout();
	layout.numColumns = 2;
	layout.marginHeight = 10;
	layout.marginWidth = 10;
	dialogArea.setLayout(layout);
	
	Label label = new Label(dialogArea, SWT.NONE);
	label.setText(description);
	GridData data = new GridData(GridData.FILL_HORIZONTAL);
	data.horizontalSpan = 2;
	label.setLayoutData(data);
	
	label = new Label(dialogArea, SWT.NONE);
	label.setText(Policy.bind("preferences.customize.addTaskDialogName"));
	nameField = new Text(dialogArea, SWT.BORDER);
	data = new GridData(GridData.FILL_HORIZONTAL);
	data.widthHint = IDialogConstants.ENTRY_FIELD_WIDTH;
	nameField.setLayoutData(data);
	nameField.addModifyListener(new ModifyListener() {
		public void modifyText(ModifyEvent e) {
			updateEnablement();
		}
	});

	label = new Label(dialogArea, SWT.NONE);
	label.setText(Policy.bind("preferences.customize.addTaskDialogClass"));
	classField = new Text(dialogArea, SWT.BORDER);
	data = new GridData(GridData.FILL_HORIZONTAL);
	data.widthHint = IDialogConstants.ENTRY_FIELD_WIDTH;
	classField.setLayoutData(data);
	classField.addModifyListener(new ModifyListener() {
		public void modifyText(ModifyEvent e) {
			updateEnablement();
		}
	});
	
	label = new Label(dialogArea, SWT.NONE);
	label.setText(Policy.bind("preferences.customize.addTaskDialogLibrary"));
	libraryField = new Combo(dialogArea, SWT.READ_ONLY | SWT.BORDER);
	data = new GridData(GridData.FILL_HORIZONTAL);
	data.widthHint = IDialogConstants.ENTRY_FIELD_WIDTH;
	libraryField.setLayoutData(data);
	libraryField.addSelectionListener(new SelectionAdapter() {
		public void widgetSelected(SelectionEvent e) {
			updateEnablement();
		}
	});
	
	//populate library combo and select input library
	libraryUrls = AntCorePlugin.getPlugin().getPreferences().getCustomURLs();
	int selection = 0;
	for (int i = 0; i < libraryUrls.length; i++) {
		libraryField.add(libraryUrls[i].getFile());
		if (libraryUrls[i].equals(library))
			selection = i;
	}
		
	//intialize fields
	if (taskName != null)
		nameField.setText(taskName);
	if (className != null)
		classField.setText(className);
	if (libraryUrls.length >= 0)
		libraryField.select(selection);
	return dialogArea;
}

public String getClassName() {
	return className;
}
public void setClassName(String className) {
	this.className = className;
}
public URL getLibrary() {
	return library;
}
/**
 * @see Dialog#okPressed()
 */
protected void okPressed() {
	className = classField.getText();
	taskName = nameField.getText();
	int selection = libraryField.getSelectionIndex();
	if (selection >= 0)
		library = libraryUrls[selection];
	super.okPressed();
}
public void setLibrary(URL library) {
	this.library = library;
}
public String getTaskName() {
	return taskName;
}
public void setTaskName(String taskName) {
	this.taskName = taskName;
}
protected void updateEnablement() {
	if (okButton != null)
		okButton.setEnabled(nameField.getText().length() > 0 && 
			classField.getText().length() > 0 &&
			libraryField.getSelectionIndex() >= 0);
}
}