/*******************************************************************************
 * Copyright (c) 2000, 2003 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials 
 * are made available under the terms of the Common Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v10.html
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.ui.externaltools.internal.program.launchConfigurations;


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

import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.debug.core.DebugPlugin;
import org.eclipse.debug.core.ILaunch;
import org.eclipse.debug.core.ILaunchConfiguration;
import org.eclipse.debug.core.model.ILaunchConfigurationDelegate;
import org.eclipse.debug.core.model.IProcess;
import org.eclipse.ui.externaltools.internal.launchConfigurations.ExternalToolsUtil;
import org.eclipse.ui.externaltools.internal.variable.ExpandVariableContext;

/**
 * Launch delegate for a program.
 */
public class ProgramLaunchDelegate implements ILaunchConfigurationDelegate {

	/**
	 * Constructor for ProgramLaunchDelegate.
	 */
	public ProgramLaunchDelegate() {
		super();
	}

	/**
	 * @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)
	 */
	public void launch(ILaunchConfiguration configuration, String mode, ILaunch launch, IProgressMonitor monitor) throws CoreException {
		
		if (monitor.isCanceled()) {
			return;
		}
		
		// get variable context
		ExpandVariableContext resourceContext = ExternalToolsUtil.getVariableContext();

		if (monitor.isCanceled()) {
			return;
		}
		
		// resolve location
		IPath location = ExternalToolsUtil.getLocation(configuration, resourceContext);
		
		if (monitor.isCanceled()) {
			return;
		}		
		
		// resolve working directory
		IPath workingDirectory = ExternalToolsUtil.getWorkingDirectory(configuration, resourceContext);
		
		if (monitor.isCanceled()) {
			return;
		}
		
		// resolve arguments
		String[] arguments = ExternalToolsUtil.getArguments(configuration, resourceContext);
		
		if (monitor.isCanceled()) {
			return;
		}
		
		int cmdLineLength = 1;
		if (arguments != null) {
			cmdLineLength += arguments.length;
		}
		String[] cmdLine = new String[cmdLineLength];
		cmdLine[0] = location.toOSString();
		if (arguments != null) {
			System.arraycopy(arguments, 0, cmdLine, 1, arguments.length);
		}
		
		File workingDir = null;
		if (workingDirectory != null) {
			workingDir = workingDirectory.toFile();
		}
		
		if (monitor.isCanceled()) {
			return;
		}
				
		Process p = DebugPlugin.exec(cmdLine, workingDir);
		IProcess process = null;
		
		// add process type to process attributes
		Map processAttributes = new HashMap();
		String programName = location.lastSegment();
		String extension = location.getFileExtension();
		if (extension != null) {
			programName = programName.substring(0, programName.length() - (extension.length() + 1));
		}
		programName = programName.toLowerCase();
		processAttributes.put(IProcess.ATTR_PROCESS_TYPE, programName);
		
		if (p != null) {
			process = DebugPlugin.newProcess(launch, p, location.toOSString(), processAttributes);
		}
		process.setAttribute(IProcess.ATTR_CMDLINE, renderCommandLine(cmdLine));
		
		if (ExternalToolsUtil.isBackground(configuration)) {
			// refresh resources after process finishes
			if (ExternalToolsUtil.getRefreshScope(configuration) != null) {
				BackgroundResourceRefresher refresher = new BackgroundResourceRefresher(configuration, process, resourceContext);
				refresher.startBackgroundRefresh();
			}				
		} else {
			// wait for process to exit
			while (!process.isTerminated()) {
				try {
					if (monitor.isCanceled()) {
						process.terminate();
						break;
					}
					Thread.sleep(50);
				} catch (InterruptedException e) {
				}
			}
			
			// refresh resources
			ExternalToolsUtil.refreshResources(configuration, resourceContext, monitor);
		}
		
	
	}
	
	protected static String renderCommandLine(String[] commandLine) {
		if (commandLine.length < 1)
			return ""; //$NON-NLS-1$
		StringBuffer buf= new StringBuffer(commandLine[0]);
		for (int i= 1; i < commandLine.length; i++) {
			buf.append(' ');
			buf.append(commandLine[i]);
		}	
		return buf.toString();
	}	
	
}