/*
 * Copyright (C) 2007 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.jf.baksmali;

/**
 * Main class for baksmali. It recognizes enough options to be able to dispatch
 * to the right "actual" main.
 */
public class main {

    public static final String VERSION = "0.91";


    private static String USAGE_MESSAGE =
        "usage:\n" +
        "  java -jar baksmali.jar --disassemble <.dex file> <output folder>\n" +
        "    disassembles the given dex file into a set of .smali files\n" +
        "    in the given folder\n" +
        "  java -jar baksmali.jar --dump <.dex file> <dump file>\n" +
        "    dumps the given dex file to a single annotated dump file\n" +
        "    that follows the order and structure of the dex file.\n" +
        "  java -jar baksmali.jar --version\n" +
        "    Print the version of this tool (" + VERSION +
        ").\n" +
        "  java -jar baksmali.jar --help\n" +
        "    Print this message.";

    /**
     * This class is uninstantiable.
     */
    private main() {
        // This space intentionally left blank.
    }

    /**
     * Run!
     */
    public static void main(String[] args) {
        boolean gotCmd = false;
        boolean showUsage = false;

        try {
            for (int i = 0; i < args.length; i++) {
                String arg = args[i];
                if (arg.equals("--") || !arg.startsWith("--")) {
                    gotCmd = false;
                    showUsage = true;
                    break;
                }

                gotCmd = true;
                if (arg.equals("--disassemble")) {
                    baksmali.main(without(args, i));
                    break;
                } else if (arg.equals("--dump")) {
                    dump.main(without(args, i));
                    break;
                } else if (arg.equals("--version")) {
                    version();
                    break;
                } else if (arg.equals("--help")) {
                    showUsage = true;
                    break;
                } else {
                    gotCmd = false;
                }
            }
        } catch (UsageException ex) {
            showUsage = true;
        } catch (RuntimeException ex) {
            System.err.println("\nUNEXPECTED TOP-LEVEL EXCEPTION:");
            ex.printStackTrace();
            System.exit(2);
        } catch (Throwable ex) {
            System.err.println("\nUNEXPECTED TOP-LEVEL ERROR:");
            ex.printStackTrace();
            System.exit(3);
        }

        if (!gotCmd) {
            System.err.println("error: no command specified");
            showUsage = true;
        }

        if (showUsage) {
            usage();
            System.exit(1);
        }
    }

    /**
     * Prints the version message.
     */
    private static void version() {
        System.err.println("baksmali version " + VERSION);
        System.exit(0);
    }

    /**
     * Prints the usage message.
     */
    private static void usage() {
        System.err.println(USAGE_MESSAGE);
    }

    /**
     * Returns a copy of the given args array, but without the indicated
     * element.
     *
     * @param orig non-null; original array
     * @param n which element to omit
     * @return non-null; new array
     */
    private static String[] without(String[] orig, int n) {
        int len = orig.length - 1;
        String[] newa = new String[len];
        System.arraycopy(orig, 0, newa, 0, n);
        System.arraycopy(orig, n + 1, newa, n, len - n);
        return newa;
    }
}