/*******************************************************************************
 * Copyright (c) 2000, 2017 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.jdt.launching;

import java.io.File;
import java.util.Map;

import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.NullProgressMonitor;
import org.eclipse.debug.core.ILaunch;
import org.eclipse.debug.core.ILaunchConfiguration;
import org.eclipse.jdt.core.IJavaProject;
import org.eclipse.jdt.core.IModuleDescription;
import org.eclipse.jdt.internal.launching.LaunchingMessages;
import org.eclipse.osgi.util.NLS;

/**
 * A launch delegate for launching local Java applications.
 * <p>
 * Clients may subclass and instantiate this class.
 * </p>
 * @since 3.1
 */
public class JavaLaunchDelegate extends AbstractJavaLaunchConfigurationDelegate {

	/* (non-Javadoc)
	 * @see org.eclipse.debug.core.model.ILaunchConfigurationDelegate#launch(org.eclipse.debug.core.ILaunchConfiguration, java.lang.String, org.eclipse.debug.core.ILaunch, org.eclipse.core.runtime.IProgressMonitor)
	 */
	@Override
	public void launch(ILaunchConfiguration configuration, String mode, ILaunch launch, IProgressMonitor monitor) throws CoreException {

		if (monitor == null) {
			monitor = new NullProgressMonitor();
		}

		monitor.beginTask(NLS.bind("{0}...", new String[]{configuration.getName()}), 3); //$NON-NLS-1$
		// check for cancellation
		if (monitor.isCanceled()) {
			return;
		}
		try {
			monitor.subTask(LaunchingMessages.JavaLocalApplicationLaunchConfigurationDelegate_Verifying_launch_attributes____1);

			String mainTypeName = verifyMainTypeName(configuration);
			IVMRunner runner = getVMRunner(configuration, mode);

			File workingDir = verifyWorkingDirectory(configuration);
			String workingDirName = null;
			if (workingDir != null) {
				workingDirName = workingDir.getAbsolutePath();
			}

			// Environment variables
			String[] envp= getEnvironment(configuration);

			// Program & VM arguments
			String pgmArgs = getProgramArguments(configuration);
			String vmArgs = getVMArguments(configuration);
			ExecutionArguments execArgs = new ExecutionArguments(vmArgs, pgmArgs);

			// VM-specific attributes
			Map<String, Object> vmAttributesMap = getVMSpecificAttributesMap(configuration);

			// Bug 522333 :to be used for modulepath only for 4.7.*
			String[][] paths = getClasspathAndModulepath(configuration);
			// Create VM config
			VMRunnerConfiguration runConfig = new VMRunnerConfiguration(mainTypeName, getClasspath(configuration));
			runConfig.setProgramArguments(execArgs.getProgramArgumentsArray());
			runConfig.setEnvironment(envp);
			runConfig.setVMArguments(execArgs.getVMArgumentsArray());
			runConfig.setWorkingDirectory(workingDirName);
			runConfig.setVMSpecificAttributesMap(vmAttributesMap);
			// current module name, if so
			try {
				IJavaProject proj = JavaRuntime.getJavaProject(configuration);
				if (proj != null) {
					IModuleDescription module = proj == null ? null : proj.getModuleDescription();
					String modName = module == null ? null : module.getElementName();
					if (modName != null) {
						runConfig.setModuleDescription(modName);
					}
				}
			}
			catch (CoreException e) {
				// Not a java Project so no need to set module description
			}

			if (!JavaRuntime.isModularConfiguration(configuration)) {
				// Bootpath
				runConfig.setBootClassPath(getBootpath(configuration));
			} else {
				// module path
				runConfig.setModulepath(paths[1]);
			}

			// check for cancellation
			if (monitor.isCanceled()) {
				return;
			}

			// stop in main
			prepareStopInMain(configuration);

			// done the verification phase
			monitor.worked(1);

			monitor.subTask(LaunchingMessages.JavaLocalApplicationLaunchConfigurationDelegate_Creating_source_locator____2);
			// set the default source locator if required
			setDefaultSourceLocator(launch, configuration);
			monitor.worked(1);

			// Launch the configuration - 1 unit of work
			runner.run(runConfig, launch, monitor);

			// check for cancellation
			if (monitor.isCanceled()) {
				return;
			}
		}
		finally {
			monitor.done();
		}
	}

}