/*******************************************************************************
 * Copyright (c) 2004, 2006 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.jem.internal.ui.proxy.remote;

import java.text.MessageFormat;

import org.eclipse.core.resources.*;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.debug.core.ILaunchConfiguration;
import org.eclipse.debug.core.ILaunchConfigurationWorkingCopy;
import org.eclipse.jdt.core.*;
import org.eclipse.jdt.debug.ui.launchConfigurations.JavaLaunchTab;
import org.eclipse.jdt.launching.IJavaLaunchConfigurationConstants;
import org.eclipse.jdt.ui.JavaElementLabelProvider;
import org.eclipse.jface.viewers.ILabelProvider;
import org.eclipse.jface.window.Window;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.*;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.*;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.dialogs.ElementListSelectionDialog;
import org.eclipse.ui.ide.IDE;

import org.eclipse.jem.internal.proxy.core.ProxyPlugin;
 
/**
 * 
 * @since 1.0.0
 */
public class LocalLaunchProjectTab extends JavaLaunchTab {
		
	// Project UI widgets
	protected Label fProjLabel;
	protected Text fProjText;
	protected Button fProjButton;
			
	
	/**
	 * @see org.eclipse.debug.ui.ILaunchConfigurationTab#createControl(Composite)
	 */
	public void createControl(Composite parent) {
		Font font = parent.getFont();
		
		Composite comp = new Composite(parent, SWT.NONE);
		setControl(comp);
		GridLayout topLayout = new GridLayout();
		comp.setLayout(topLayout);		
		GridData gd;
		
		createVerticalSpacer(comp, 1);
		
		Composite projComp = new Composite(comp, SWT.NONE);
		GridLayout projLayout = new GridLayout();
		projLayout.numColumns = 2;
		projLayout.marginHeight = 0;
		projLayout.marginWidth = 0;
		projComp.setLayout(projLayout);
		gd = new GridData(GridData.FILL_HORIZONTAL);
		projComp.setLayoutData(gd);
		projComp.setFont(font);
		
		fProjLabel = new Label(projComp, SWT.NONE);
		fProjLabel.setText(ProxyRemoteUIMessages.LocalLaunchProjectTab_Project); 
		gd = new GridData();
		gd.horizontalSpan = 2;
		fProjLabel.setLayoutData(gd);
		fProjLabel.setFont(font);
		
		fProjText = new Text(projComp, SWT.SINGLE | SWT.BORDER);
		gd = new GridData(GridData.FILL_HORIZONTAL);
		fProjText.setLayoutData(gd);
		fProjText.setFont(font);
		fProjText.addModifyListener(new ModifyListener() {
			public void modifyText(ModifyEvent evt) {
				updateLaunchConfigurationDialog();
			}
		});
		
		fProjButton = createPushButton(projComp, ProxyRemoteUIMessages.LocalLaunchProjectTab_Browse, null); 
		fProjButton.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent evt) {
				handleProjectButtonSelected();
			}
		});
				
	}
		
	/**
	 * @see org.eclipse.debug.ui.ILaunchConfigurationTab#initializeFrom(ILaunchConfiguration)
	 */
	public void initializeFrom(ILaunchConfiguration config) {
		super.initializeFrom(config);
		updateProjectFromConfig(config);
	}
	
	protected void updateProjectFromConfig(ILaunchConfiguration config) {
		String projectName = ""; //$NON-NLS-1$
		try {
			projectName = config.getAttribute(IJavaLaunchConfigurationConstants.ATTR_PROJECT_NAME, "");	 //$NON-NLS-1$
		} catch (CoreException ce) {
			ProxyPlugin.getPlugin().getLogger().log(ce);
		}
		fProjText.setText(projectName);
	}
			
	/**
	 * @see org.eclipse.debug.ui.ILaunchConfigurationTab#performApply(ILaunchConfigurationWorkingCopy)
	 */
	public void performApply(ILaunchConfigurationWorkingCopy config) {
		config.setAttribute(IJavaLaunchConfigurationConstants.ATTR_PROJECT_NAME, fProjText.getText());		
	}
			
	/**
	 * Show a dialog that lets the user select a project.  This in turn provides
	 * context for the main type, allowing the user to key a main type name, or
	 * constraining the search for main types to the specified project.
	 */
	protected void handleProjectButtonSelected() {
		IJavaProject project = chooseJavaProject();
		if (project == null) {
			return;
		}
		
		String projectName = project.getElementName();
		fProjText.setText(projectName);		
	}
	
	/**
	 * Realize a Java Project selection dialog and return the first selected project,
	 * or null if there was none.
	 */
	protected IJavaProject chooseJavaProject() {
		IJavaProject[] projects;
		try {
			projects= JavaCore.create(getWorkspaceRoot()).getJavaProjects();
		} catch (JavaModelException e) {
			ProxyPlugin.getPlugin().getLogger().log(e);
			projects= new IJavaProject[0];
		}
		
		ILabelProvider labelProvider= new JavaElementLabelProvider(JavaElementLabelProvider.SHOW_DEFAULT);
		ElementListSelectionDialog dialog= new ElementListSelectionDialog(getShell(), labelProvider);
		dialog.setTitle(ProxyRemoteUIMessages.LocalLaunchProjectTab_Project_Selection); 
		dialog.setMessage(ProxyRemoteUIMessages.LocalLaunchProjectTab_ChooseProject); 
		dialog.setElements(projects);
		
		IJavaProject javaProject = getJavaProject();
		if (javaProject != null) {
			dialog.setInitialSelections(new Object[] { javaProject });
		}
		if (dialog.open() == Window.OK) {			
			return (IJavaProject) dialog.getFirstResult();
		}			
		return null;		
	}
	
	/**
	 * Return the IJavaProject corresponding to the project name in the project name
	 * text field, or null if the text does not match a project name.
	 */
	protected IJavaProject getJavaProject() {
		String projectName = fProjText.getText().trim();
		if (projectName.length() < 1) {
			return null;
		}
		return getJavaModel().getJavaProject(projectName);		
	}
	
	/**
	 * Convenience method to get the workspace root.
	 */
	private IWorkspaceRoot getWorkspaceRoot() {
		return ResourcesPlugin.getWorkspace().getRoot();
	}
	
	/**
	 * Convenience method to get access to the java model.
	 */
	private IJavaModel getJavaModel() {
		return JavaCore.create(getWorkspaceRoot());
	}

	/**
	 * @see org.eclipse.debug.ui.ILaunchConfigurationTab#isValid(ILaunchConfiguration)
	 */
	public boolean isValid(ILaunchConfiguration config) {
		
		setErrorMessage(null);
		setMessage(null);
		
		String name = fProjText.getText().trim();
		if (name.length() > 0) {
			IWorkspace workspace = ResourcesPlugin.getWorkspace();
			IStatus status = workspace.validateName(name, IResource.PROJECT);
			if (status.isOK()) {
				IProject project= ResourcesPlugin.getWorkspace().getRoot().getProject(name);
				if (!project.exists()) {
					setErrorMessage(MessageFormat.format(ProxyRemoteUIMessages.LocalLaunchProjectTab_ProjectNotExist_ERROR_, new String[] {name})); 
					return false;
				}
				if (!project.isOpen()) {
					setErrorMessage(MessageFormat.format(ProxyRemoteUIMessages.LocalLaunchProjectTab_ProjectNotOpen_ERROR_, new String[] {name})); 
					return false;
				}
			} else {
				setErrorMessage(MessageFormat.format(ProxyRemoteUIMessages.LocalLaunchProjectTab_ProjectValidateError_ERROR_, new String[]{status.getMessage()})); 
				return false;
			}
		}
		
		return false;	// Kludge. We always return false so that "Run" button is never enabled. We can't launch these configurations using the standard way. Only through ProxyLaunchSupport.
	}

	/**
	 * @see org.eclipse.debug.ui.ILaunchConfigurationTab#setDefaults(ILaunchConfigurationWorkingCopy)
	 */
	public void setDefaults(ILaunchConfigurationWorkingCopy config) {
		IJavaElement javaElement = getContext();
		if (javaElement != null) {
			initializeJavaProject(javaElement, config);
		} else {
			// We set empty attributes for project so that when one config is
			// compared to another, the existence of empty attributes doesn't cause an
			// incorrect result (the performApply() method can result in empty values
			// for these attributes being set on a config if there is nothing in the
			// corresponding text boxes)
			config.setAttribute(IJavaLaunchConfigurationConstants.ATTR_PROJECT_NAME, ""); //$NON-NLS-1$
		}
	}

	/**
	 * @see org.eclipse.debug.ui.ILaunchConfigurationTab#getName()
	 */
	public String getName() {
		return ProxyRemoteUIMessages.LocalLaunchProjectTab_name; 
	}

	/**
	 * @see org.eclipse.debug.ui.ILaunchConfigurationTab#getImage()
	 */
	public Image getImage() {
		return PlatformUI.getWorkbench().getSharedImages().getImage(IDE.SharedImages.IMG_OBJ_PROJECT);
	}
}