/* ProcessWrapper.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 net.adoptopenjdk.icedteaweb.testing.browsertesting.ReactingProcess;
import org.junit.Assert;

import java.io.File;
import java.io.OutputStream;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
import java.util.Optional;


/**
 * This class wraps execution of ThreadedProcess.
 * Add listeners and allows another setters, eg of ReactingProcess
 */
public class ProcessWrapper {

    private final List<String> args;
    private File dir;
    private final List<ContentReaderListener> stdoutl = new ArrayList<>(1);
    private final List<ContentReaderListener> stderrl = new ArrayList<>(1);
    private String[] vars;
    private ReactingProcess reactingProcess;


    public ProcessWrapper(final String toBeExecuted, final List<String> otherargs, final URL u) {
        this(toBeExecuted, otherargs, u.toString());
    }

    private ProcessWrapper(final String toBeExecuted, final List<String> otherargs, final String s) {
        Assert.assertNotNull(s);
        Assert.assertNotNull(toBeExecuted);
        Assert.assertTrue(toBeExecuted.trim().length() > 1);
        final List<String> urledArgs = new ArrayList<>(Optional.ofNullable(otherargs).orElse(new ArrayList<>(1)));
        urledArgs.add(0, toBeExecuted);
        urledArgs.add(s);
        this.args = urledArgs;
        this.vars = null;
    }

    public ProcessWrapper(final String toBeExecuted, final List<String> otherargs, final URL u, final ContentReaderListener stdoutl, final ContentReaderListener stderrl, final String[] vars) {
        this(toBeExecuted, otherargs, u);
        this.addStdOutListener(stdoutl);
        this.addStdErrListener(stderrl);
        this.vars = vars;

    }

    public ProcessWrapper(final List<String> args, final File dir, final ContentReaderListener stdoutl, final ContentReaderListener stderrl) {
        this.args = args;
        this.dir = dir;
        this.addStdOutListener(stdoutl);
        this.addStdErrListener(stderrl);
        this.vars = null;
    }


    private void addStdOutListener(final ContentReaderListener l) {
        if (l == null) {
            return;
        }
        stdoutl.add(l);

    }

    private void addStdErrListener(final ContentReaderListener l) {
        if (l == null) {
            return;
        }
        stderrl.add(l);

    }

    public ProcessResult execute() throws Exception {
        if (reactingProcess != null) {
            reactingProcess.beforeProcess("");
        }
        final ThreadedProcess t = new ThreadedProcess(args, dir, vars);
        if (ServerAccess.PROCESS_LOG) {
            final String connectionMessage = createConnectionMessage(t);
            ServerAccess.log(connectionMessage, true, true);
        }
        final ProcessAssassin pa = new ProcessAssassin(t, ServerAccess.PROCESS_TIMEOUT);
        t.setAssassin(pa);
        pa.setReactingProcess(reactingProcess);
        setUpClosingListener(stdoutl, pa);
        setUpClosingListener(stderrl, pa);
        t.setWriter(null);
        pa.start();
        t.start();
        while (t.getP() == null && t.deadlyException == null) {
            Thread.sleep(100);
        }
        if (t.deadlyException != null) {
            pa.setCanRun(false);
            return new ProcessResult("", "", null, true, Integer.MIN_VALUE, t.deadlyException);
        }
        final ContentReader crs = new ContentReader(t.getP().getInputStream(), stdoutl);
        final ContentReader cre = new ContentReader(t.getP().getErrorStream(), stderrl);

        final OutputStream out = t.getP().getOutputStream();
        if (out != null) {
            out.close();
        }

        new Thread(crs).start();
        new Thread(cre).start();
        while (t.isRunning()) {
            Thread.sleep(100);
        }

        while (!t.isDestroyed()) {
            Thread.sleep(100);
        }
        pa.setCanRun(false);
        // ServerAccess.logOutputReprint(t.getP().exitValue()); when process is killed, this throws exception

        final ProcessResult pr = new ProcessResult(crs.getContent(), cre.getContent(), t.getP(), pa.wasTerminated(), t.getExitCode(), null);
        if (ServerAccess.PROCESS_LOG) {
            ServerAccess.log(pr.stdout, true, false);
            ServerAccess.log(pr.stderr, false, true);
        }
        return pr;
    }

    private static void setUpClosingListener(final List<ContentReaderListener> listeners, final ProcessAssassin pa) {
        for (final ContentReaderListener listener : listeners) {
            if (listener != null && (listener instanceof ClosingListener)) {
                ((ClosingListener) listener).setAssassin(pa);
            }
        }

    }

    private static String createConnectionMessage(final ThreadedProcess t) {
        return "Connecting " + t.getCommandLine();
    }

    void setReactingProcess(final ReactingProcess reactingProcess) {
        this.reactingProcess = reactingProcess;
    }
}
