/**

 * Back 2 Browser Bytecode Translator

 * Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>

 *

 * This program is free software: you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation, version 2 of the License.

 *

 * This program 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 for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program. Look for COPYING file in the top folder.

 * If not, see http://opensource.org/licenses/GPL-2.0.

 */

package org.apidesign.vm4brwsr;

import java.io.BufferedWriter;

import java.io.File;

import java.io.FileWriter;

import java.io.IOException;

import java.io.Writer;

/** Generator of JavaScript from bytecode of classes on classpath of the VM

 * with a Main method.

 *

 * @author Jaroslav Tulach <jtulach@netbeans.org>

 */

final class Main {

    private Main() {}

    public static void main(String... args) throws IOException {

        final String obfuscate = "--obfuscatelevel";

        if (args.length < 2) {

            System.err.println("Bck2Brwsr Translator from Java(tm) to JavaScript, (c) Jaroslav Tulach 2012");

            System.err.println("Usage: java -cp ... -jar ... [");

            System.err.print(obfuscate);

            System.err.print(" [");

            boolean first = true;

            for (ObfuscationLevel l : ObfuscationLevel.values()) {

                if (!first) {

                    System.err.print('|');

                }

                System.err.print(l.name());

                first = false;

            }

            System.err.println("] <file_to_generate_js_code_to> java/lang/Class org/your/App ...");

            System.exit(9);

        }

        ObfuscationLevel obfLevel = ObfuscationLevel.NONE;

        StringArray classes = new StringArray();

        String generateTo = null;

        for (int i = 0; i < args.length; i++) {

            if (obfuscate.equals(args[i])) { // NOI18N

                i++;

                try {

                    obfLevel = ObfuscationLevel.valueOf(args[i]);

                } catch (Exception e) {

                    System.err.print(obfuscate);

                    System.err.print(" parameter needs to be followed by one of ");

                    boolean first = true;

                    for (ObfuscationLevel l : ObfuscationLevel.values()) {

                        if (!first) {

                            System.err.print(", ");

                        }

                        System.err.print(l.name());

                        first = false;

                    }

                    System.err.println();

                    System.exit(1);

                }

                continue;

            }

            if (generateTo == null) {

                generateTo = args[i];

            } else {

                classes = classes.addAndNew(args[i]);

            }

        }

        File gt = new File(generateTo);

        if (Boolean.getBoolean("skip.if.exists") && gt.isFile()) {

            System.err.println("Skipping as " + gt + " exists.");

            System.exit(0);

        }

        try (Writer w = new BufferedWriter(new FileWriter(gt))) {

            Bck2Brwsr.newCompiler().

                obfuscation(obfLevel).

                addRootClasses(classes.toArray()).

                resources(Main.class.getClassLoader()).

                generate(w);

        }

    }

}