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/*
========================================================================
SchemaCrawler
http://www.schemacrawler.com
Copyright (c) 2000-2016, Sualeh Fatehi .
All rights reserved.
------------------------------------------------------------------------
 
SchemaCrawler is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 
SchemaCrawler and the accompanying materials are made available under
the terms of the Eclipse Public License v1.0, GNU General Public License
v3 or GNU Lesser General Public License v3.
 
You may elect to redistribute this code under any of these licenses.
 
The Eclipse Public License is available at:
http://www.eclipse.org/legal/epl-v10.html
 
The GNU General Public License v3 and the GNU Lesser General Public
License v3 are available at:
http://www.gnu.org/licenses/
 
========================================================================
*/
package schemacrawler.spring.boot.ext.command;

import static java.util.Objects.requireNonNull;
import static sf.util.Utility.containsWhitespace;
import static sf.util.Utility.isBlank;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.FutureTask;
import java.util.logging.Level;
import java.util.logging.Logger;

import sf.util.StringFormat;

public class ProcessExecutor implements Callable {

	final class StreamReader implements Callable {

		private final InputStream in;

		private StreamReader(final InputStream in) {
			if (in == null) {
				throw new RuntimeException("No input stream provided");
			}
			this.in = in;
		}

		@Override
		public String call() throws Exception {
			final Reader reader = new BufferedReader(new InputStreamReader(in));
			return reader.toString();
		}

	}

	private static final Logger LOGGER = Logger.getLogger(ProcessExecutor.class.getName());

	private List command;
	private String processOutput;
	private String processError;
	private int exitCode;

	@Override
	public Integer call() throws IOException {
		requireNonNull(command, "No command provided");
		if (command.isEmpty()) {
			throw new IOException("No command provided");
		}

		LOGGER.log(Level.CONFIG, new StringFormat("Executing:%n%s", command));

		final ExecutorService threadPool = Executors.newFixedThreadPool(2);
		try {

			final ProcessBuilder processBuilder = new ProcessBuilder(command);
			final Process process = processBuilder.start();

			final FutureTask inReaderTask = new FutureTask<>(new StreamReader(process.getInputStream()));
			threadPool.execute(inReaderTask);
			final FutureTask errReaderTask = new FutureTask<>(new StreamReader(process.getErrorStream()));
			threadPool.execute(errReaderTask);

			exitCode = process.waitFor();

			processOutput = inReaderTask.get();
			processError = errReaderTask.get();

			return exitCode;
		} catch (final SecurityException | ExecutionException | InterruptedException e) {
			throw new IOException(e.getMessage(), e);
		} catch (final Throwable t) {
			LOGGER.log(Level.SEVERE, t.getMessage(), t);
			throw new IOException(t.getMessage(), t);
		} finally {
			threadPool.shutdown();
		}
	}

	public List getCommand() {
		return command;
	}

	public int getExitCode() {
		return exitCode;
	}

	public String getProcessError() {
		return processError;
	}

	public String getProcessOutput() {
		return processOutput;
	}

	public void setCommandLine(final List args) {
		requireNonNull(args, "No command provided");
		if (args.isEmpty()) {
			throw new IllegalArgumentException("No command provided");
		}

		command = new ArrayList();
		for (final String arg : args) {
			if (isBlank(arg)) {
				continue;
			} else if (containsWhitespace(arg)) {
				command.add(String.format("\"%s\"", arg));
			} else {
				command.add(arg);
			}
		}
	}

}