/*******************************************************************************
 * Copyright (c) 2005 BEA Systems, Inc. 
 * 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:
 *    rfrost@bea.com - initial API and implementation
 *    
 *    Based on GenericServerBehavior by Gorkem Ercan
 *******************************************************************************/
package org.eclipse.jst.server.generic.core.internal;

import java.util.Iterator;
import java.util.List;

import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.debug.core.ILaunch;
import org.eclipse.debug.core.ILaunchConfigurationWorkingCopy;
import org.eclipse.jdt.launching.IJavaLaunchConfigurationConstants;
import org.eclipse.jst.server.generic.internal.xml.Resolver;
import org.eclipse.jst.server.generic.servertype.definition.External;
import org.eclipse.jst.server.generic.servertype.definition.ServerRuntime;
import org.eclipse.wst.server.core.IServer;
import org.eclipse.wst.server.core.internal.Server;

/**
 * Subclass of <code>GenericServerBehavior</code> that supports 
 * servers which are started/stopped via external executables (e.g. scripts).
 */
public class ExternalServerBehaviour extends GenericServerBehaviour {
	
	// config for debugging session
	private ILaunchConfigurationWorkingCopy wc;
    private String mode;
    private ILaunch launch; 
    private IProgressMonitor monitor;
	
	/**
	 * Override to trigger the launch of the debugging session (if appropriate).
	 */
	protected synchronized void setServerStarted() {
		super.setServerStarted();
		if (wc != null) {
			try {
				ExternalLaunchConfigurationDelegate.startDebugging(wc, mode, launch, monitor);
			} catch (CoreException ce) {
				// swallow
			} finally {
				clearDebuggingConfig();
			}
		}
 	}
	
	/**
	 * Since terminate() is called during restart, need to override to
	 * call shutdown instead of just killing the original process.
	 */
	protected void terminate() {
		int state = getServer().getServerState();
		if (state == IServer.STATE_STOPPED) 
    		return;
    
		// need to execute a standard shutdown rather than
		// just killing the original process
		// the originally launched process may have only been
		// a proxy and thus no longer executing
		shutdown(state);
	}
	
	/**
	 * Override superclass method to correctly setup the launch configuration for starting an external
	 * server.
	 */
	public void setupLaunchConfiguration(ILaunchConfigurationWorkingCopy workingCopy,
										 IProgressMonitor monitor) throws CoreException {
		clearDebuggingConfig();
		ServerRuntime serverDef = getServerDefinition();
		Resolver resolver = serverDef.getResolver();
		workingCopy.setAttribute(IJavaLaunchConfigurationConstants.ATTR_WORKING_DIRECTORY,
					resolver.resolveProperties(serverDef.getStart().getWorkingDirectory()));
		String external = resolver.resolveProperties(getExternalForOS(serverDef.getStart().getExternal()));
		workingCopy.setAttribute(ExternalLaunchConfigurationDelegate.COMMANDLINE, external);
		workingCopy.setAttribute(ExternalLaunchConfigurationDelegate.DEBUG_PORT, 
					resolver.resolveProperties(serverDef.getStart().getDebugPort()));
		// just use the commandline for now
		workingCopy.setAttribute(ExternalLaunchConfigurationDelegate.EXECUTABLE_NAME, external); 
	}

	/*
	 * Returns the first external whose "os" attribute matches (case insensitive) the beginning 
	 * of the name of the current OS (as determined by the System "os.name" property). If
	 * no such match is found, returns the first external that does not have an OS attribute.
	 */
	private String getExternalForOS(List externals) {
		String currentOS = System.getProperty("os.name").toLowerCase();
		External external;
		String matchingExternal = null;
		String externalOS;
		Iterator i = externals.iterator();
		while (i.hasNext()) {
			external= (External) i.next();
			externalOS = external.getOs();
			if (externalOS == null) {
				if (matchingExternal == null) {
					matchingExternal = external.getValue();
				}
			} else if (currentOS.startsWith(externalOS.toLowerCase())) {
				matchingExternal = external.getValue();
				break;
			}
		}
		return matchingExternal;
	}

	/**
     * Returns the String ID of the launch configuration type.
     * @return
     */
	protected String getConfigTypeID() {
		return ExternalLaunchConfigurationDelegate.ID_EXTERNAL_LAUNCH_TYPE;
	}

	/**
	 * Returns the String name of the stop launch configuration.
	 * @return
	 */
	protected String getStopLaunchName() {
		return GenericServerCoreMessages.externalStopLauncher;
	}
	
	/**
	 * Sets up the launch configuration for stopping the server.
	 * @param workingCopy
	 */
	protected void setupStopLaunchConfiguration(GenericServerRuntime runtime, ILaunchConfigurationWorkingCopy wc) {
		clearDebuggingConfig();
		ServerRuntime serverDef = getServerDefinition();
		Resolver resolver = serverDef.getResolver(); 
		wc.setAttribute(IJavaLaunchConfigurationConstants.ATTR_WORKING_DIRECTORY,
					resolver.resolveProperties(serverDef.getStop().getWorkingDirectory()));
		String external = resolver.resolveProperties(getExternalForOS(serverDef.getStop().getExternal()));
		wc.setAttribute(ExternalLaunchConfigurationDelegate.COMMANDLINE, external);
		// just use commandline for now
		wc.setAttribute(ExternalLaunchConfigurationDelegate.EXECUTABLE_NAME, external); 	
		wc.setAttribute(Server.ATTR_SERVER_ID, getServer().getId());
	}
	
	/**
	 * Sets the configuration to use for launching a debugging session
	 */
	protected synchronized void setDebuggingConfig(ILaunchConfigurationWorkingCopy wc,
					 			      String mode,
					 			      ILaunch launch, 
					 			      IProgressMonitor monitor) {
		this.wc = wc;
		this.mode = mode;
		this.launch = launch;
		this.monitor = monitor;
	}
	
	private synchronized void clearDebuggingConfig() {
		this.wc = null;
		this.mode = null;
		this.launch = null;
		this.monitor = null;
	}
	
}