/*
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2002 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "The Jakarta Project", "Ant", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
 *    from this software without prior written permission. For written
 *    permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache"
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 *    permission of the Apache Group.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */
package org.apache.tools.ant.taskdefs.optional.rjunit;

import java.io.BufferedOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.Properties;

import junit.runner.TestCollector;

import org.apache.avalon.excalibur.i18n.ResourceManager;
import org.apache.avalon.excalibur.i18n.Resources;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.ProjectComponent;
import org.apache.tools.ant.taskdefs.Execute;
import org.apache.tools.ant.taskdefs.LogStreamHandler;
import org.apache.tools.ant.types.Commandline;
import org.apache.tools.ant.types.CommandlineJava;
import org.apache.tools.ant.types.Path;
import org.apache.tools.ant.util.FileUtils;

/**
 * An element representing the client configuration.
 *
 * <pre>
 * <!ELEMENT server (jvmarg)* (classpath)* (test)* (batchtest)*>
 * <!ATTLIST server port numeric 6666>
 * <!ATTLIST server host CDATA 127.0.0.1>
 * </pre>

 * @author <a href="mailto:sbailliez@apache.org">Stephane Bailliez</a>
 */
public final class ClientElement extends ProjectComponent {
    /** resources */
    private final static Resources RES =
            ResourceManager.getPackageResources(ClientElement.class);

    /** port to contact the server. Default to 6666 */
    private int port = 6666;

    /** server hostname to connect to. Default to 127.0.0.1 */
    private String host = "127.0.0.1";

    /** test collector elements */
    private ArrayList testCollectors = new ArrayList();

    /** the command line to launch the TestRunner */
    private CommandlineJava cmd = new CommandlineJava();

    /** the parent task */
    private RJUnitTask parent;

    /** help debug the TestRunner */
    private boolean debug = false;

    /** create a new client */
    public ClientElement(RJUnitTask value) {
        parent = value;
        cmd.setClassname("org.apache.tools.ant.taskdefs.optional.rjunit.remote.TestRunner");
    }

    /** core entry point */
    public final void execute() throws BuildException {
        try {
            preExecute();
            doExecute();
        } finally {
            postExecute();
        }
    }

    protected void preExecute() throws BuildException {
        // must appended to classpath to avoid conflicts.
        JUnitHelper.addClasspathEntry(createClasspath(), "/junit/framework/TestCase.class");
        JUnitHelper.addClasspathEntry(createClasspath(), "/org/apache/tools/ant/Task.class");
        JUnitHelper.addClasspathEntry(createClasspath(), "/org/apache/tools/ant/taskdefs/optional/rjunit/remote/TestRunner.class");
    }

    protected void doExecute() throws BuildException {
        File tmp = configureTestRunner();
        Execute execute = new Execute(new LogStreamHandler(parent, Project.MSG_VERBOSE, Project.MSG_VERBOSE));
        execute.setCommandline(cmd.getCommandline());
        execute.setAntRun(project);

        log(RES.getString("task.process-cmdline.log", cmd.toString()), Project.MSG_VERBOSE);
        int retVal = 0;
        try {
            retVal = execute.execute();
            if (retVal != 0) {
                throw new BuildException("task.process-failed.error");
            }
        } catch (IOException e) {
            String msg = RES.getString("task.process-failed.error");
            throw new BuildException(msg, e);
        } finally {
            tmp.delete();
        }
    }

    protected void postExecute() {
        // nothing
    }

    /**
     * @return all collected tests specified with test elements.
     */
    protected Enumeration collectTests() {
        final int count = testCollectors.size();
        final Enumeration[] tests = new Enumeration[count];
        for (int i = 0; i < count; i++) {
            TestCollector te = (TestCollector) testCollectors.get(i);
            tests[i] = te.collectTests();
        }
        return new CompoundEnumeration(tests);
    }

    /**
     * Configure the runner with the appropriate configuration file.
     * @return the reference to the temporary configuration file
     * to be deleted once the TestRunner has ended.
     */
    protected File configureTestRunner() throws BuildException {
        Properties props = new Properties();
        props.setProperty("debug", String.valueOf(debug));
        props.setProperty("host", host);
        props.setProperty("port", String.valueOf(port));
        // get all test classes to run...
        StringBuffer buf = new StringBuffer(10240);
        Enumeration classnames = collectTests();
        while (classnames.hasMoreElements()) {
            String classname = (String) classnames.nextElement();
            buf.append(classname).append(" ");
        }
        props.setProperty("classnames", buf.toString());

        // dump the properties to a temporary file.
        FileUtils futils = FileUtils.newFileUtils();
        File f = futils.createTempFile("junit-antrunner", "tmp", new File("."));
        OutputStream os = null;
        try {
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            os = new BufferedOutputStream(new FileOutputStream(f));
            props.store(baos, "JUnit Ant Runner configuration file");
            log(baos.toString(), Project.MSG_VERBOSE);
            os.write(baos.toByteArray());
        } catch (IOException e) {
            throw new BuildException(e);
        } finally {
            if (os != null) {
                try {
                    os.close();
                } catch (IOException e) {
                }
            }
        }

        // configure the runner
        cmd.createArgument().setValue("-file");
        cmd.createArgument().setValue(f.getAbsolutePath());
        return f;
    }

// --- Ant bean setters

    /** set the port to connect to */
    public void setPort(int value) {
        port = value;
    }

    /** set the host to contact */
    public void setHost(String value) {
        host = value;
    }

    /** set debug mode for the runner. it will log a file to working dir */
    public void setDebug(boolean flag) {
        debug = flag;
    }

    /** Create a new JVM argument. */
    public Commandline.Argument createJvmarg() {
        return cmd.createVmArgument();
    }

    /** classpath to be set for running tests */
    public Path createClasspath() {
        return cmd.createClasspath(getProject());
    }

    /** add a single test element */
    public void addConfiguredTest(TestElement value) {
        testCollectors.add(value);
    }

    /** add a batch test element */
    public void addConfiguredBatchTest(BatchTestElement value) {
        // add the classpath of batchtest to cmd classpath
        Path path = value.getPath();
        cmd.getClasspath().append(path);
        testCollectors.add(value);
    }

}