/*******************************************************************************
 * Copyright (c) 2000, 2015 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jdi.internal.connect;

import java.io.IOException;
import java.io.InterruptedIOException;
import java.util.HashMap;
import java.util.Map;

import org.eclipse.debug.core.DebugPlugin;
import org.eclipse.jdi.internal.VirtualMachineImpl;
import org.eclipse.jdi.internal.VirtualMachineManagerImpl;
import org.eclipse.osgi.util.NLS;

import com.sun.jdi.VirtualMachine;
import com.sun.jdi.connect.Connector;
import com.sun.jdi.connect.IllegalConnectorArgumentsException;
import com.sun.jdi.connect.LaunchingConnector;
import com.sun.jdi.connect.VMStartException;

public class SocketRawLaunchingConnectorImpl extends ConnectorImpl implements
		LaunchingConnector {
	/** Time that a launched VM is given to connect to us. */
	private static final int ACCEPT_TIMEOUT = 10000;

	/** Raw command to start the debugged application VM. */
	private String[] fCommand;
	/**
	 * Address from which to listen for a connection after the raw command is
	 * run.
	 */
	private String fAddress;

	/**
	 * Creates new SocketAttachingConnectorImpl.
	 */
	public SocketRawLaunchingConnectorImpl(
			VirtualMachineManagerImpl virtualMachineManager) {
		super(virtualMachineManager);

		// Create communication protocol specific transport.
		SocketTransportImpl transport = new SocketTransportImpl();
		setTransport(transport);
	}

	/**
	 * @return Returns the default arguments.
	 */
	@Override
	public Map<String, Connector.Argument> defaultArguments() {
		HashMap<String, Connector.Argument> arguments = new HashMap<>(3);

		// Command
		StringArgumentImpl strArg = new StringArgumentImpl(
				"command", ConnectMessages.SocketRawLaunchingConnectorImpl_Raw_command_to_start_the_debugged_application_VM_1, ConnectMessages.SocketRawLaunchingConnectorImpl_Command_2, true); //$NON-NLS-1$
		arguments.put(strArg.name(), strArg);

		// Address
		strArg = new StringArgumentImpl(
				"address", ConnectMessages.SocketRawLaunchingConnectorImpl_Address_from_which_to_listen_for_a_connection_after_the_raw_command_is_run_3, ConnectMessages.SocketRawLaunchingConnectorImpl_Address_4, true); //$NON-NLS-1$
		arguments.put(strArg.name(), strArg);

		// Quote
		strArg = new StringArgumentImpl(
				"quote", ConnectMessages.SocketRawLaunchingConnectorImpl_Character_used_to_combine_space_delimited_text_into_a_single_command_line_argument_5, ConnectMessages.SocketRawLaunchingConnectorImpl_Quote_6, true); //$NON-NLS-1$
		strArg.setValue("\""); //$NON-NLS-1$
		arguments.put(strArg.name(), strArg);

		return arguments;
	}

	/**
	 * @return Returns a short identifier for the connector.
	 */
	@Override
	public String name() {
		return "com.sun.jdi.RawCommandLineLaunch"; //$NON-NLS-1$
	}

	/**
	 * @return Returns a human-readable description of this connector and its
	 *         purpose.
	 */
	@Override
	public String description() {
		return ConnectMessages.SocketRawLaunchingConnectorImpl_Launches_target_using_user_specified_command_line_and_attaches_to_it_7;
	}

	/**
	 * Retrieves connection arguments.
	 */
	private void getConnectionArguments(Map<String,? extends Connector.Argument> connectionArgs)
			throws IllegalConnectorArgumentsException {
		String attribute = ""; //$NON-NLS-1$
		try {
			attribute = "command"; //$NON-NLS-1$
			fCommand = DebugPlugin.parseArguments(((Connector.StringArgument) connectionArgs
					.get(attribute)).value());
			attribute = "address"; //$NON-NLS-1$
			fAddress = ((Connector.StringArgument) connectionArgs
					.get(attribute)).value();
			attribute = "quote"; //$NON-NLS-1$
			((Connector.StringArgument) connectionArgs.get(attribute)).value();
		} catch (ClassCastException e) {
			throw new IllegalConnectorArgumentsException(
					ConnectMessages.SocketRawLaunchingConnectorImpl_Connection_argument_is_not_of_the_right_type_8,
					attribute);
		} catch (NullPointerException e) {
			throw new IllegalConnectorArgumentsException(
					ConnectMessages.SocketRawLaunchingConnectorImpl_Necessary_connection_argument_is_null_9,
					attribute);
		} catch (NumberFormatException e) {
			throw new IllegalConnectorArgumentsException(
					ConnectMessages.SocketRawLaunchingConnectorImpl_Connection_argument_is_not_a_number_10,
					attribute);
		}
	}

	/* (non-Javadoc)
	 * @see com.sun.jdi.connect.LaunchingConnector#launch(java.util.Map)
	 */
	@Override
	public VirtualMachine launch(Map<String,? extends Connector.Argument> connectionArgs) throws IOException,
			IllegalConnectorArgumentsException, VMStartException {
		getConnectionArguments(connectionArgs);

		// A listening connector is used that waits for a connection of the VM
		// that is started up.
		// Note that port number zero means that a free port is chosen.
		SocketListeningConnectorImpl listenConnector = new SocketListeningConnectorImpl(
				virtualMachineManager());
		Map<String, Connector.Argument> args = listenConnector.defaultArguments();
		((Connector.IntegerArgument) args.get("port")).setValue(fAddress); //$NON-NLS-1$
		((Connector.IntegerArgument) args.get("timeout")).setValue(ACCEPT_TIMEOUT); //$NON-NLS-1$
		listenConnector.startListening(args);

		// Start VM.
		Process proc = Runtime.getRuntime().exec(fCommand);

		// The accept times out it the VM does not connect.
		VirtualMachineImpl virtualMachine;
		try {
			virtualMachine = (VirtualMachineImpl) listenConnector.accept(args);
		} catch (InterruptedIOException e) {
			proc.destroy();
			String message = NLS.bind(ConnectMessages.SocketLaunchingConnectorImpl_VM_did_not_connect_within_given_time___0__ms_1,
							new String[] { ((Connector.IntegerArgument) args
									.get("timeout")).value() }); //$NON-NLS-1$
			throw new VMStartException(message, proc);
		}

		virtualMachine.setLaunchedProcess(proc);
		return virtualMachine;
	}
}