/*

 * Copyright (c) 2011, 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 sun.tools.jcmd;

import java.io.BufferedReader;

import java.io.FileReader;

import java.io.IOException;

class Arguments {

    private boolean listProcesses = false;

    private boolean listCounters  = false;

    private boolean showUsage     = false;

    private String  command       = null;

    private String  processString = null;

    public boolean isListProcesses() { return listProcesses; }

    public boolean isListCounters() { return listCounters; }

    public boolean isShowUsage() { return showUsage; }

    public String getCommand() { return command; }

    public String getProcessString() { return processString; }

    public Arguments(String[] args) {

        if (args.length == 0 || args[0].equals("-l")) {

            listProcesses = true;

            /* list all processes */

            processString = "0";

            return;

        }

        if (args[0].equals("-?") ||

            args[0].equals("-h") ||

            args[0].equals("--help") ||

            // -help: legacy.

            args[0].equals("-help")) {

            showUsage = true;

            return;

        }

        processString = args[0];

        StringBuilder sb = new StringBuilder();

        for (int i = 1; i < args.length; i++) {

            if (args[i].equals("-f")) {

                if (args.length == i + 1) {

                    throw new IllegalArgumentException(

                        "No file specified for parameter -f");

                } else if (args.length == i + 2) {

                    try {

                        readCommandFile(args[i + 1]);

                    } catch(IOException e) {

                        throw new IllegalArgumentException(

                            "Could not read from file specified with -f option: "

                            + args[i + 1]);

                    }

                    return;

                } else {

                    throw new IllegalArgumentException(

                        "Options after -f are not allowed");

                }

            } else if (args[i].equals("PerfCounter.print")) {

                listCounters = true;

            } else {

                sb.append(args[i]).append(" ");

            }

        }

        if (listCounters != true && sb.length() == 0) {

            throw new IllegalArgumentException("No command specified");

        }

        command = sb.toString().trim();

    }

    private void readCommandFile(String path) throws IOException {

        try (BufferedReader bf = new BufferedReader(new FileReader(path));) {

                StringBuilder sb = new StringBuilder();

                String s;

                while ((s = bf.readLine()) != null) {

                    sb.append(s).append("\n");

                }

                command = sb.toString();

            }

    }

    public static void usage() {

        System.out.println("Usage: jcmd <pid | main class> <command ...|PerfCounter.print|-f file>");

        System.out.println("   or: jcmd -l                                                    ");

        System.out.println("   or: jcmd -h                                                    ");

        System.out.println("                                                                  ");

        System.out.println("  command must be a valid jcmd command for the selected jvm.      ");

        System.out.println("  Use the command \"help\" to see which commands are available.   ");

        System.out.println("  If the pid is 0, commands will be sent to all Java processes.   ");

        System.out.println("  The main class argument will be used to match (either partially ");

        System.out.println("  or fully) the class used to start Java.                         ");

        System.out.println("  If no options are given, lists Java processes (same as -l).     ");

        System.out.println("                                                                  ");

        System.out.println("  PerfCounter.print display the counters exposed by this process  ");

        System.out.println("  -f  read and execute commands from the file                     ");

        System.out.println("  -l  list JVM processes on the local machine                     ");

        System.out.println("  -? -h --help print this help message                            ");

    }

}