/*

 * Copyright (c) 2015, 2016, 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.

 */

package compiler.compilercontrol.parser;

import compiler.compilercontrol.share.JSONFile;

import compiler.compilercontrol.share.method.MethodDescriptor;

import compiler.compilercontrol.share.scenario.DirectiveWriter;

import compiler.compilercontrol.share.scenario.Scenario;

import jdk.test.lib.process.OutputAnalyzer;

import jdk.test.lib.process.ProcessTools;

import jdk.test.lib.Utils;

import java.util.EnumSet;

import java.util.List;

import java.util.Random;

import java.util.stream.Collectors;

/**

 * Creates a huge directive file

 */

public final class HugeDirectiveUtil {

    private static final Random RANDOM = Utils.getRandomInstance();

    protected static final String EXPECTED_ERROR_STRING = "Parsing of compiler "

            + "directives failed";

    private HugeDirectiveUtil() { }

    /**

     * Creates huge file with specified amount of directives

     *

     * @param descriptors a list of descriptors to be randomly used

     *                    in match and inline blocks

     * @param fileName    a directives file name to be created

     * @param amount      an amount of match objects

     */

    public static void createHugeFile(List<MethodDescriptor> descriptors,

            String fileName, int amount) {

        try (DirectiveWriter file = new DirectiveWriter(fileName)) {

            file.write(JSONFile.Element.ARRAY);

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

                createMatchObject(descriptors, file, 1);

            }

            file.end();

        }

    }

    /**

     * Creates match object in the given file with specified size

     *

     * @param descriptors a list of method descriptors to be used

     * @param file        a directive file to write at

     * @param objectSize  a size of the match object

     */

    public static void createMatchObject(List<MethodDescriptor> descriptors,

            DirectiveWriter file, int objectSize) {

        // get random amount of methods for the match

        List<String> methods = getRandomDescriptors(descriptors);

        file.match(methods.toArray(new String[methods.size()]));

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

            // emit compiler block

            file.emitCompiler(Utils.getRandomElement(

                    Scenario.Compiler.values()));

            // add option inside the compiler block

            file.option(Utils.getRandomElement(DirectiveWriter.Option.values()),

                    RANDOM.nextBoolean());

            file.end(); // ends compiler block

            // add standalone option, enable can't be used standalone

            EnumSet<DirectiveWriter.Option> options = EnumSet.complementOf(

                    EnumSet.of(DirectiveWriter.Option.ENABLE));

            file.option(Utils.getRandomElement(options), RANDOM.nextBoolean());

        }

        // add inline block with random inlinees

        methods = getRandomDescriptors(descriptors).stream()

                .map(s -> (RANDOM.nextBoolean() ? "+" : "-") + s)

                .collect(Collectors.toList());

        file.inline(methods);

        // end match block

        file.end();

    }

    private static List<String> getRandomDescriptors(

            List<MethodDescriptor> descriptors) {

        int amount = 1 + RANDOM.nextInt(descriptors.size() - 1);

        int skipAmount = RANDOM.nextInt(descriptors.size() - amount);

        return descriptors.stream()

                .skip(skipAmount)

                .limit(amount)

                .map(MethodDescriptor::getString)

                .collect(Collectors.toList());

    }

    protected static OutputAnalyzer execute(String fileName) {

        OutputAnalyzer output;

        try {

            output = ProcessTools.executeTestJvm(

                    "-XX:+UnlockDiagnosticVMOptions",

                    "-XX:CompilerDirectivesLimit=1000",

                    "-XX:CompilerDirectivesFile=" + fileName,

                    "-version");

        } catch (Throwable thr) {

            throw new Error("Execution failed with: " + thr, thr);

        }

        return output;

    }

}