/*

 * Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code 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

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package jdk.jfr.jcmd;

import java.io.File;

import java.nio.file.Path;

import java.nio.file.Paths;

import java.util.Iterator;

import jdk.jfr.Configuration;

import jdk.jfr.Recording;

import jdk.test.lib.jfr.FileHelper;

import jdk.test.lib.process.OutputAnalyzer;

/**

 * @test

 * @summary The test verifies JFR.dump command

 * @key jfr

 * @requires vm.hasJFR

 * @library /test/lib /test/jdk

 * @run main/othervm jdk.jfr.jcmd.TestJcmdDumpGeneratedFilename

 */

public class TestJcmdDumpGeneratedFilename {

    public static void main(String[] args) throws Exception {

        // Increase the id for a recording

        for (int i = 0; i < 300; i++) {

            new Recording();

        }

        try (Recording r = new Recording(Configuration.getConfiguration("default"))) {

            r.start();

            r.stop();

            testDumpFilename();

            testDumpFilename(r);

            testDumpDiectory();

            testDumpDiectory(r);

        }

    }

    private static void testDumpFilename() throws Exception {

        OutputAnalyzer output = JcmdHelper.jcmd("JFR.dump");

        verifyFile(readFilename(output), null);

    }

    private static void testDumpFilename(Recording r) throws Exception {

        OutputAnalyzer output = JcmdHelper.jcmd("JFR.dump", "name=" + r.getId());

        verifyFile(readFilename(output), r.getId());

    }

    private static void testDumpDiectory() throws Exception {

        Path directory = Paths.get(".").toAbsolutePath().normalize();

        OutputAnalyzer output = JcmdHelper.jcmd("JFR.dump", "filename=" + directory);

        String filename = readFilename(output);

        verifyFile(filename, null);

        verifyDirectory(filename, directory);

    }

    private static void testDumpDiectory(Recording r) throws Exception {

        Path directory = Paths.get(".").toAbsolutePath().normalize();

        OutputAnalyzer output = JcmdHelper.jcmd("JFR.dump", "name=" + r.getId(), "filename=" + directory);

        String filename = readFilename(output);

        verifyFile(filename, r.getId());

        verifyDirectory(filename, directory);

    }

    private static void verifyDirectory(String filename, Path directory) throws Exception {

        if (!filename.contains(directory.toAbsolutePath().normalize().toString())) {

            throw new Exception("Expected dump to be at " + directory);

        }

    }

    private static void verifyFile(String filename, Long id) throws Exception {

        String idText = id == null ? "" : "-id-" + Long.toString(id);

        String expectedName = "hotspot-pid-" + ProcessHandle.current().pid() + idText;

        if (!filename.contains(expectedName)) {

            throw new Exception("Expected filename to contain " + expectedName);

        }

        FileHelper.verifyRecording(new File(filename));

    }

    private static String readFilename(OutputAnalyzer output) throws Exception {

        Iterator<String> it = output.asLines().iterator();

        while (it.hasNext()) {

            String line = it.next();

            if (line.contains("written to")) {

                line = it.next(); // blank line

                return it.next();

            }

        }

        throw new Exception("Could not find filename of dumped recording.");

    }

}