/*

 * Copyright (c) 2017, 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.

 *

 * 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 nsk.sysdict.share;

import jdk.test.lib.JDKToolLauncher;

import jdk.test.lib.Utils;

import jdk.test.lib.process.ProcessTools;

import java.io.IOException;

import java.nio.file.Files;

import java.nio.file.Path;

import java.nio.file.Paths;

import java.util.Arrays;

import java.util.stream.Stream;

public class GenClassesBuilder {

    public static void main(String[] args) {

        if (args == null || args.length == 0) {

            throw new Error("args can't be empty");

        }

        for (String arg : args) {

            switch (arg) {

                case "btree":

                    build("btree", "BTree",

                            () -> BTreeGen.main(new String[] {"default"}));

                    break;

                case "leans":

                    build("leans", "Leans",

                            () -> ChainGen.main(new String[] {"leans"}));

                    break;

                case "fats":

                    build("fats", "Fats",

                            () -> ChainGen.main(new String[] {"fats"}));

                    break;

                default:

                    throw new Error("unkown target " + arg);

            }

        }

    }

    private static void build(String name, String prefix, Runnable generator) {

        generator.run();

        Path genSrcDir = Paths.get(name, "genSrc", "nsk", "sysdict", "share");

        Path classesDir = Paths.get(name,"classes").toAbsolutePath();

        try {

            Files.createDirectories(genSrcDir);

        } catch (IOException e) {

            throw new Error("can't create dir " + genSrcDir, e);

        }

        moveJavaFiles(genSrcDir, prefix);

        JDKToolLauncher javac = JDKToolLauncher.create("javac")

                                               .addToolArg("-d")

                                               .addToolArg(classesDir.toString())

                                               .addToolArg("-cp")

                                               .addToolArg(Utils.TEST_CLASS_PATH);

        try (Stream<Path> stream = Files.walk(genSrcDir)) {

            stream.map(Path::toAbsolutePath)

                  .map(Path::toString)

                  .filter(s -> s.endsWith(".java"))

                  .forEach(javac::addToolArg);

        } catch (IOException e) {

            throw new Error("traverse dir " + genSrcDir, e);

        }

        executeTool(javac);

        buildJar(name + ".jar", classesDir);

    }

    private static void executeTool(JDKToolLauncher tool) {

        String[] command = tool.getCommand();

        try {

            ProcessTools.executeCommand(command)

                        .shouldHaveExitValue(0);

        } catch (Error | RuntimeException e) {

            throw e;

        } catch (Throwable e) {

            throw new Error("execution of " + Arrays.toString(command) + " failed", e);

        }

    }

    private static void buildJar(String name, Path dir) {

        JDKToolLauncher jar = JDKToolLauncher.create("jar")

                                             .addToolArg("cf")

                                             .addToolArg(name)

                                             .addToolArg("-C")

                                             .addToolArg(dir.toString())

                                             .addToolArg(".");

        executeTool(jar);

    }

    private static void moveJavaFiles(Path dir, String prefix) {

        try (Stream<Path> stream = Files.list(Paths.get("."))) {

            stream.filter(Files::isRegularFile)

                  .filter(p -> {

                      String s = p.getFileName().toString();

                      return s.startsWith(prefix) && s.endsWith(".java");})

                  .forEach(p -> move(p, dir));

        } catch (IOException e) {

            throw new Error("can't traverse current dir", e);

        }

    }

    private static void move(Path src, Path dstDir) {

        if (Files.notExists(src)) {

            throw new Error("file " + src + " doesn't exit");

        }

        try {

            Files.move(src, dstDir.resolve(src.getFileName()));

        } catch (IOException e) {

            throw new Error("can't move " + src + " to " + dstDir, e);

        }

    }

}