/* ThreadedProcess.java
Copyright (C) 2011,2012 Red Hat, Inc.

This file is part of IcedTea.

IcedTea is free software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation, version 2.

IcedTea 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. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with
IcedTea; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA.

Linking this library statically or dynamically with other modules is making a
combined work based on this library. Thus, the terms and conditions of the GNU
General Public License cover the whole combination.

As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent modules, and
to copy and distribute the resulting executable under terms of your choice,
provided that you also meet, for each linked independent module, the terms and
conditions of the license of that module. An independent module is a module
which is not derived from or based on this library. If you modify this library,
you may extend this exception to your version of the library, but you are not
obligated to do so. If you do not wish to do so, delete this exception
statement from your version.
*/

package net.adoptopenjdk.icedteaweb.testing;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.util.List;

import net.adoptopenjdk.icedteaweb.ProcessUtils;

import static java.nio.charset.StandardCharsets.UTF_8;

/**
 * wrapper around Runtime.getRuntime().exec(...) which ensures that process is run inside its own, by us controlled, thread.
 * Process builder caused some unexpected and weird behavior :/
 */
public class ThreadedProcess extends Thread {

    private final List<String> args;
    private final File dir;
    private final String[] variables;

    private Process p = null;
    private Integer exitCode;
    private Boolean running;
    Throwable deadlyException = null;
    /*
     * before removing this "useless" variable
     * check DeadLockTestTest.testDeadLockTestTerminated2
     */
    private boolean destroyed = false;
    private ProcessAssassin assassin;
    private InputStream writer;

    public ThreadedProcess(final List<String> args, final File dir, final String[] vars) {
        this.args = args;
        this.dir = dir;
        this.variables = vars;
    }

    public boolean isDestroyed() {
        return destroyed;
    }

    public void setDestroyed(boolean destroyed) {
        this.destroyed = destroyed;
    }

    public Boolean isRunning() {
        return running;
    }

    public Integer getExitCode() {
        return exitCode;
    }

    public void setWriter(final InputStream writer) {
        this.writer = writer;
    }


    public String getCommandLine() {
        StringBuilder commandLine = new StringBuilder("unknown command");
        try {
            if (args != null && args.size() > 0) {
                commandLine = new StringBuilder();
                for (String string : args) {
                    commandLine.append(" ").append(string);
                }
            }
        } catch (final Exception ex) {
            ex.printStackTrace();
        }
        return commandLine.toString();
    }

    public Process getP() {
        return p;
    }

    @Override
    public void run() {
        try {
            running = true;
            final Runtime r = Runtime.getRuntime();
            if (dir == null) {
                if (variables == null) {
                    p = r.exec(args.toArray(new String[0]));
                } else {
                    p = r.exec(args.toArray(new String[0]), variables);
                }
            } else {
                p = r.exec(args.toArray(new String[0]), variables, dir);
            }
            try {
                if (writer != null) {
                    final Thread t = new Thread(() -> {
                        try (
                                final BufferedReader br = new BufferedReader(new InputStreamReader(writer, UTF_8));
                                final BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(p.getOutputStream(), UTF_8))) {
                            while (true) {
                                final String s = br.readLine();
                                if (s == null) {
                                    break;
                                }
                                bw.write(s + System.lineSeparator());
                                bw.flush();

                            }
                        } catch (final Exception ex) {
                            ServerAccess.logException(ex);
                        }
                    });
                    t.start();
                }
                ProcessUtils.waitForSafely(p);
                exitCode = p.exitValue();
                Thread.sleep(500); //this is giving to fast done processes's e/o readers time to read all. I would like to know better solution :-/
                while (assassin.isKilling() && !assassin.haveKilled()) {
                    Thread.sleep(100);
                }
            } finally {
                destroyed = true;
            }
        } catch (final Exception ex) {
            if (ex instanceof InterruptedException) {
                //add to the set of terminated threaded processes
                deadlyException = ex;
                ServerAccess.logException(deadlyException, false);
                //ServerAccess.terminated.add(this);
            } else {
                //happens when non-existing process is launched, is causing p null!
                //ServerAccess.terminated.add(this);
                deadlyException = ex;
                ServerAccess.logException(deadlyException, false);
                throw new RuntimeException(ex);
            }
        } finally {
            running = false;
        }
    }

    void setAssassin(ProcessAssassin pa) {
        this.assassin = pa;
    }
}
