/*

 * Copyright (c) 2015, 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.

 *

 * 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.

 */

 /*

 * @test

 * @summary Test previsitor

 * @author Andrei Eremeev

 * @modules jdk.jlink/jdk.tools.jlink

 *          jdk.jlink/jdk.tools.jlink.internal

 *          jdk.jlink/jdk.tools.jlink.plugin

 * @run main/othervm PrevisitorTest

 */

import java.nio.ByteOrder;

import java.util.ArrayList;

import java.util.Collection;

import java.util.Collections;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import java.util.Optional;

import java.util.stream.Collectors;

import jdk.tools.jlink.internal.ImagePluginConfiguration;

import jdk.tools.jlink.internal.Jlink;

import jdk.tools.jlink.internal.PluginRepository;

import jdk.tools.jlink.internal.ImagePluginStack;

import jdk.tools.jlink.internal.ResourcePoolManager;

import jdk.tools.jlink.internal.ResourcePoolManager.ResourcePoolImpl;

import jdk.tools.jlink.internal.ResourcePrevisitor;

import jdk.tools.jlink.internal.StringTable;

import jdk.tools.jlink.plugin.Plugin;

import jdk.tools.jlink.plugin.ResourcePool;

import jdk.tools.jlink.plugin.ResourcePoolBuilder;

import jdk.tools.jlink.plugin.ResourcePoolEntry;

public class PrevisitorTest {

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

        new PrevisitorTest().test();

    }

    private static Plugin createPlugin(String name) {

        return Jlink.newPlugin(name, Collections.emptyMap(), null);

    }

    public void test() throws Exception {

        CustomPlugin plugin = new CustomPlugin();

        PluginRepository.registerPlugin(plugin);

        List<Plugin> plugins = new ArrayList<>();

        plugins.add(createPlugin(CustomPlugin.NAME));

        ImagePluginStack stack = ImagePluginConfiguration.parseConfiguration(new Jlink.PluginsConfiguration(plugins,

                null, null));

        ResourcePoolManager inResources = new ResourcePoolManager(ByteOrder.nativeOrder(), new CustomStringTable());

        inResources.add(ResourcePoolEntry.create("/aaa/bbb/res1.class", new byte[90]));

        inResources.add(ResourcePoolEntry.create("/aaa/bbb/res2.class", new byte[90]));

        inResources.add(ResourcePoolEntry.create("/aaa/bbb/res3.class", new byte[90]));

        inResources.add(ResourcePoolEntry.create("/aaa/ddd/res1.class", new byte[90]));

        inResources.add(ResourcePoolEntry.create("/aaa/res1.class", new byte[90]));

        ResourcePool outResources = stack.visitResources(inResources);

        Collection<String> input = inResources.entries()

                .map(Object::toString)

                .collect(Collectors.toList());

        Collection<String> output = outResources.entries()

                .map(Object::toString)

                .collect(Collectors.toList());

        if (!input.equals(output)) {

            throw new AssertionError("Input and output resources differ: input: "

                    + input + ", output: " + output);

        }

    }

    private static class CustomStringTable implements StringTable {

        private final List<String> strings = new ArrayList<>();

        @Override

        public int addString(String str) {

            strings.add(str);

            return strings.size() - 1;

        }

        @Override

        public String getString(int id) {

            return strings.get(id);

        }

        public int size() {

            return strings.size();

        }

    }

    private static class CustomPlugin implements Plugin, ResourcePrevisitor {

        private static String NAME = "plugin";

        private boolean isPrevisitCalled = false;

        @Override

        public ResourcePool transform(ResourcePool inResources, ResourcePoolBuilder outResources) {

            if (!isPrevisitCalled) {

                throw new AssertionError("Previsit was not called");

            }

            CustomStringTable table = (CustomStringTable)((ResourcePoolImpl)inResources).getStringTable();

            if (table.size() == 0) {

                throw new AssertionError("Table is empty");

            }

            Map<String, Integer> count = new HashMap<>();

            for (int i = 0; i < table.size(); ++i) {

                String s = table.getString(i);

                Optional<ResourcePoolEntry> e = inResources.findEntry(s);

                if (e.isPresent()) {

                    throw new AssertionError();

                }

                count.compute(s, (k, c) -> 1 + (c == null ? 0 : c));

            }

            count.forEach((k, v) -> {

                if (v != 1) {

                    throw new AssertionError("Expected one entry in the table, got: " + v + " for " + k);

                }

            });

            inResources.entries().forEach(r -> {

                outResources.add(r);

            });

            return outResources.build();

        }

        @Override

        public String getName() {

            return NAME;

        }

        @Override

        public void previsit(ResourcePool resources, StringTable strings) {

            isPrevisitCalled = true;

            resources.entries().forEach(r -> {

                String s = r.path();

                int lastIndexOf = s.lastIndexOf('/');

                if (lastIndexOf >= 0) {

                    strings.addString(s.substring(0, lastIndexOf));

                }

            });

        }

    }

}