/*

 * Copyright (c) 2005-2009 Nokia Corporation and/or its subsidiary(-ies). 

 * All rights reserved.

 * This component and the accompanying materials are made available

 * under the terms of "Eclipse Public License v1.0"

 * which accompanies this distribution, and is available

 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

 *

 * Initial Contributors:

 * Nokia Corporation - initial contribution.

 *

 * Contributors:

 *

 * Description: 

 *

 */

package com.nokia.testfw.codegen.ui.wizard;

import java.util.Set;

import org.eclipse.jface.resource.JFaceResources;

import org.eclipse.swt.SWT;

import org.eclipse.swt.custom.CLabel;

import org.eclipse.swt.events.ModifyEvent;

import org.eclipse.swt.events.ModifyListener;

import org.eclipse.swt.events.SelectionAdapter;

import org.eclipse.swt.events.SelectionEvent;

import org.eclipse.swt.graphics.Image;

import org.eclipse.swt.graphics.Point;

import org.eclipse.swt.graphics.Rectangle;

import org.eclipse.swt.layout.GridData;

import org.eclipse.swt.layout.GridLayout;

import org.eclipse.swt.widgets.Button;

import org.eclipse.swt.widgets.Dialog;

import org.eclipse.swt.widgets.Display;

import org.eclipse.swt.widgets.Label;

import org.eclipse.swt.widgets.Shell;

import org.eclipse.swt.widgets.Text;

import com.nokia.testfw.codegen.ui.Messages;

import com.nokia.testfw.codegen.model.INode;

import com.nokia.testfw.codegen.model.MethodNodeImpl;

import com.nokia.testfw.codegen.model.ClassNodeImpl;

public class MethodEditDialog extends Dialog {

	private static final Image ERROR_IMG = JFaceResources

			.getImage("dialog_message_error_image");

	private boolean result = false;

	private String iTitle;

	private MethodNodeImpl iTestMethod;

	private ClassNodeImpl iTestClass;

	private Text iTestMethodNameText;

	private Button iBtnOK;

	private CLabel iMessageLabel;

	private String iMethodName;

	private static final String NEWMETHOD = "TestMethod";

	public MethodEditDialog(Shell parent, String title,

			MethodNodeImpl testmethod) {

		super(parent, 0);

		iTitle = title;

		if (testmethod != null) {

			iTestMethod = testmethod;

			iTestClass = (ClassNodeImpl) iTestMethod.getParent();

		} else {

			throw new IllegalArgumentException(

					"Parameter testmethod can not be null.");

		}

	}

	public MethodEditDialog(Shell parent, String title,

			ClassNodeImpl parentClass) {

		super(parent, 0);

		iTitle = title;

		if (parentClass != null) {

			iTestClass = parentClass;

			int counter = 1;

			while (isDuplicate(NEWMETHOD + Integer.toString(counter))) {

				counter++;

			}

			iTestMethod = new MethodNodeImpl(NEWMETHOD

					+ Integer.toString(counter), parentClass);

		} else {

			throw new IllegalArgumentException(

					"Parameter parentClass can not be null.");

		}

	}

	private void init(final Shell shell) {

		shell.setText(iTitle);

		shell.setLayout(new GridLayout(4, true));

		Label label = new Label(shell, SWT.None);

		GridData data = new GridData(GridData.FILL_HORIZONTAL);

		data.horizontalSpan = 1;

		label.setLayoutData(data);

		label.setText(Messages.getString("MethodDialog.MethodName"));

		iTestMethodNameText = new Text(shell, SWT.BORDER);

		data = new GridData(GridData.FILL_HORIZONTAL);

		data.horizontalSpan = 3;

		iTestMethodNameText.setLayoutData(data);

		iTestMethodNameText.setText(iTestMethod.getName());

		iTestMethodNameText.addModifyListener(new ModifyListener() {

			public void modifyText(ModifyEvent event) {

				canComplete(validation());

			}

		});

		iTestMethodNameText.selectAll();

		// Message Label

		iMessageLabel = new CLabel(shell, SWT.NONE);

		GridData messageLabelData = new GridData(GridData.FILL_HORIZONTAL);

		messageLabelData.horizontalSpan = 4;

		iMessageLabel.setLayoutData(messageLabelData);

		label = new Label(shell, SWT.None);

		data = new GridData(GridData.FILL_HORIZONTAL);

		data.horizontalSpan = 2;

		label.setLayoutData(data);

		iBtnOK = new Button(shell, SWT.PUSH);

		iBtnOK.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));

		iBtnOK.setText(Messages.getString("Dialog.OK"));

		iBtnOK.addSelectionListener(new SelectionAdapter() {

			public void widgetSelected(SelectionEvent event) {

				result = true;

				iTestMethod.setName(iMethodName);

				((Button) event.widget).getShell().dispose();

			}

		});

		Button lBtnCancel = new Button(shell, SWT.PUSH);

		lBtnCancel.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));

		lBtnCancel.setText(Messages.getString("Dialog.Cancel"));

		lBtnCancel.addSelectionListener(new SelectionAdapter() {

			public void widgetSelected(SelectionEvent event) {

				result = false;

				((Button) event.widget).getShell().dispose();

			}

		});

		canComplete(validation());

	}

	public boolean open() {

		Shell parent = getParent();

		Shell shell = new Shell(parent, SWT.DIALOG_TRIM | SWT.APPLICATION_MODAL);

		init(shell);

		shell.pack();

		Rectangle lParentBounds = parent.getBounds();

		Point lDialogSize = shell.getSize();

		shell.setLocation(lParentBounds.x

				+ (lParentBounds.width - lDialogSize.x) / 2, lParentBounds.y

				+ (lParentBounds.height - lDialogSize.y) / 2);

		shell.open();

		Display display = parent.getDisplay();

		while (!shell.isDisposed()) {

			if (!display.readAndDispatch())

				display.sleep();

		}

		return result;

	}

	private boolean isDuplicate(String name) {

		Set<INode> lMethodSet = (Set<INode>) iTestClass.getChildren();

		for (INode item : lMethodSet) {

			if (item != iTestMethod) {

				if (item.getName().equals(name)) {

					return true;

				}

			}

		}

		return false;

	}

	private boolean validation() {

		String text = iTestMethodNameText.getText();

		if (!text.matches("^[a-zA-Z~_]\\w*")) {

			showMessage(Messages.getString("MethodDialog.InvalidMethodName",

					text));

			return false;

		}

		if (isDuplicate(text)) {

			showMessage(Messages.getString("MethodDialog.DuplicateMethodName",

					text));

			return false;

		}

		iMethodName = text;

		showMessage(null);

		return true;

	}

	private void canComplete(boolean validate) {

		if (validate) {

			iBtnOK.setEnabled(true);

		} else {

			iBtnOK.setEnabled(false);

		}

	}

	private void showMessage(String message) {

		if (message == null) {

			iMessageLabel.setImage(null);

			iMessageLabel.setText(null);

		} else {

			iMessageLabel.setImage(ERROR_IMG);

			iMessageLabel.setText(message);

		}

	}

	public MethodNodeImpl getMethodItem() {

		return iTestMethod;

	}

}