/*

 * Copyright (c) 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

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 */

package jdk.jfr.internal.tool;

import java.io.IOException;

import java.io.PrintWriter;

import java.nio.file.Path;

import java.util.Collections;

import java.util.Comparator;

import java.util.Deque;

import java.util.List;

import jdk.jfr.consumer.RecordingFile;

import jdk.jfr.internal.Type;

final class Metadata extends Command {

    private static class TypeComparator implements Comparator<Type> {

        @Override

        public int compare(Type t1, Type t2) {

            int g1 = groupValue(t1);

            int g2 = groupValue(t2);

            if (g1 == g2) {

                String n1 = t1.getName();

                String n2 = t2.getName();

                String package1 = n1.substring(0, n1.lastIndexOf('.') + 1);

                String package2 = n2.substring(0, n2.lastIndexOf('.') + 1);

                if (package1.equals(package2)) {

                    return n1.compareTo(n2);

                } else {

                    // Ensure that jdk.* are printed first

                    // This makes it easier to find user defined events at the end.

                    if (Type.SUPER_TYPE_EVENT.equals(t1.getSuperType()) && !package1.equals(package2)) {

                        if (package1.equals("jdk.jfr")) {

                            return -1;

                        }

                        if (package2.equals("jdk.jfr")) {

                            return 1;

                        }

                    }

                    return package1.compareTo(package2);

                }

            } else {

                return Integer.compare(groupValue(t1), groupValue(t2));

            }

        }

        int groupValue(Type t) {

            String superType = t.getSuperType();

            if (superType == null) {

                return 1;

            }

            if (Type.SUPER_TYPE_ANNOTATION.equals(superType)) {

                return 3;

            }

            if (Type.SUPER_TYPE_SETTING.equals(superType)) {

                return 4;

            }

            if (Type.SUPER_TYPE_EVENT.equals(superType)) {

                return 5;

            }

            return 2; // reserved for enums in the future

        }

    }

    @Override

    public String getName() {

        return "metadata";

    }

    @Override

    public List<String> getOptionSyntax() {

        return Collections.singletonList("<file>");

    }

    @Override

    public String getDescription() {

        return "Display event metadata, such as labels, descriptions and field layout";

    }

    @Override

    public void execute(Deque<String> options) throws UserSyntaxException, UserDataException {

        Path file = getJFRInputFile(options);

        boolean showIds = false;

        int optionCount = options.size();

        while (optionCount > 0) {

            if (acceptOption(options, "--ids")) {

                showIds = true;

            }

            if (optionCount == options.size()) {

                // No progress made

                throw new UserSyntaxException("unknown option " + options.peek());

            }

            optionCount = options.size();

        }

        try (PrintWriter pw = new PrintWriter(System.out)) {

            PrettyWriter prettyWriter = new PrettyWriter(pw);

            prettyWriter.setShowIds(showIds);

            try (RecordingFile rf = new RecordingFile(file)) {

                Collections.sort(types, new TypeComparator());

                for (Type type : types) {

                    prettyWriter.printType(type);

                }

                prettyWriter.flush(true);

            } catch (IOException ioe) {

                couldNotReadError(file, ioe);

            }

        }

    }

}