// Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies).

// All rights reserved.

// This component and the accompanying materials are made available

// under the terms of "Eclipse Public License v1.0"

// which accompanies this distribution, and is available

// at the URL "http://www.eclipse.org/legal/epl-v10.html".

//

// Initial Contributors:

// Nokia Corporation - initial contribution.

//

// Contributors:

//

// Description:

//

package com.symbian.smt.gui.builder;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

import java.io.OutputStream;

import java.util.List;

import org.eclipse.swt.widgets.Display;

import com.symbian.smt.gui.Logger;

import com.symbian.smt.gui.views.ConsoleOutput;

public class SMTProcess {

	/**

	 * Runs the command line base System Model Generator

	 * 

	 * @param List

	 *            <String> Arguments for the CLI

	 * @return int The exit code from the System Model Generator

	 */

	public int run(List<String> command) {

		int result = 0;

		// Reset the console

		Display.getDefault().asyncExec(new Runnable() {

			public void run() {

				ConsoleOutput.reset();

			}

		});

		// Print the command line string to the console output

		StringBuilder commandLineString = new StringBuilder();

		for (String item : command) {

			commandLineString.append(item.concat(" "));

		}

		writeToConsoleOutput("Executing '" + commandLineString.toString() + "'");

		// First we check that Perl is available

		ProcessBuilder pbCheckPerl = new ProcessBuilder("perl", "-v");

		pbCheckPerl.redirectErrorStream(true);

		try {

			pbCheckPerl.start();

		} catch (IOException e) {

			writeToConsoleOutput("Error: Perl is not installed");

			return 9009; // Same exit code as Windows produces for a program not

							// found

		}

		ProcessBuilder pb = new ProcessBuilder(command);

		// Redirect STDERR to STDOUT

		pb.redirectErrorStream(true);

		try {

			// Start the process

			final Process p = pb.start();

			// Get and close the process STDIN

			OutputStream out = p.getOutputStream();

			out.close();

			// Create a reader to read from the process STDOUT

			BufferedReader inReader = new BufferedReader(new InputStreamReader(

					p.getInputStream()));

			// Print STDOUT to the command output view

			String line;

			while ((line = inReader.readLine()) != null) {

				writeToConsoleOutput(line);

			}

			// Close the process STDOUT pipe when finished

			inReader.close();

			try {

				// Ensure the process has finished and get the exit code

				result = p.waitFor();

			} catch (InterruptedException e) {

				Logger.log(e.getMessage(), e);

			} finally {

				// Destroy the process

				p.destroy();

			}

		} catch (IOException e) {

			Logger.log(e.getMessage(), e);

		}

		return result;

	}

	private void writeToConsoleOutput(final String string) {

		Display.getDefault().asyncExec(new Runnable() {

			public void run() {

				ConsoleOutput.addText(string);

			}

		});

	}

}