/*

 * Copyright (c) 2002, 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 java.io.*;

/**

 * This tools generates a chain of classes.

 * For more details, use:

 * <pre>

 *     java ChainGen -help

 * </pre>

 */

public class ChainGen {

    private static final int FATS_HEIGHT = 5;

    private static final int FATS_WEIGHT = 10000;

    private static final int LEANS_HEIGHT = 50;

    private static final int LEANS_WEIGHT = 1;

    private static void explain(Object x) {

        System.err.println("# " + x);

    }

    public static void main(String args[]) {

        if (args.length < 1 || args[0].toLowerCase().startsWith("-h")) {

            explain("Generates a chain classes extending each other.");

            explain("");

            explain("Use:");

            explain("    java ChainGen $NAME $HEIGHT $WEIGHT");

            explain("Or:");

            explain("    java ChainGen \"fats\"");

            explain("Or:");

            explain("    java ChainGen \"leans\"");

            explain("");

            explain("This creates:");

            explain("    ${NAME}Info.java class displaying HEIGHT and WEIGHT.");

            explain("    ${NAME}XXXXXX.java defining classes chain.");

            explain("");

            explain("Here:");

            explain("    HEIGHT and WEIGHT must be positive integers.");

            explain("    Defaults for \"fats\": HEIGHT is " + FATS_HEIGHT

                + ", WEIGHT is " + FATS_WEIGHT +".");

            explain("    Defaults for \"leans\": HEIGHT is " + LEANS_HEIGHT

                + ", WEIGHT is " + LEANS_WEIGHT +".");

            System.exit(1);

        };

        String name;

        int height, weight;

        if (args[0].toLowerCase().equals("fats")) {

            name   = "Fats";

            height = FATS_HEIGHT;

            weight = FATS_WEIGHT;

        } else if (args[0].toLowerCase().equals("leans")) {

            name   = "Leans";

            height = LEANS_HEIGHT;

            weight = LEANS_WEIGHT;

        } else {

            name   = args[0];

            height = Integer.parseInt(args[1]);

            weight = Integer.parseInt(args[2]);

        };

        try {

            doit(name, height, weight);

        } catch (IOException exception) {

            exception.printStackTrace(System.err);

            System.exit(1);

        }

    }

    private static void doit(String name, int height, int weight)

        throws FileNotFoundException

    {

        // Constants definition:

        PrintStream info = new PrintStream(

                new FileOutputStream(new File(name + "Info.java"))

            );

        info.println("// This file is generated by: ChainGen.java");

        info.println("package nsk.sysdict.share;");

        info.println("public class " + name + "Info {");

        info.println("    public static final int HEIGHT = " + height + ";");

        info.println("    private static final int WEIGHT = " + weight + ";");

        info.println("    public static final String rootName = \"" + name + "\";");

        info.println("    public static final String[] nodeNames = new String[] {");

        // Generate a series of fat classes:

        for (int index=0; index<height; index++) {

            String suffix = digits(index,6);

            String className = name + suffix;

            info.println("        \"" + suffix + "\""

                + (index+1<height? "," : ""));

            PrintStream chain = new PrintStream(

                new FileOutputStream(new File(className + ".java"))

            );

            chain.println("// This file is generated by: ChainGen.java");

            chain.println("package nsk.sysdict.share;");

            chain.println("class " + className

                + (index>0? " extends " + name + digits(index-1,6): "")

                + " {");

            for (int w=0; w<weight; w++) {

                String fieldName = "fill_" + className + "_" + digits(w,6);

                chain.println("    static long " + fieldName + ";");

            }

            chain.println("}");

            chain.close();

        };

        //

        info.println("    };");

        info.println("}");

        info.close();

    }

    /**

     * Convert <tt>x</tt> to <tt>n</tt>-digits string.

     */

    private static String digits(int x, int n) {

        String s = "" + x;

        while (s.length() < n)

            s = "0" + s;

        return s;

    }

}