/**

 * 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.ByteArrayInputStream;

import java.io.DataInputStream;

import java.io.IOException;

/**

 *

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

 */

public class Numbers {

    private static Double autoboxDbl() {

        return 3.3;

    }

    public static String autoboxDblToString() {

        return autoboxDbl().toString().toString();

    }

    public static int rem(int a, int b) {

        return a % b;

    }

    static float deserFloat() throws IOException {

        byte[] arr = {(byte) 71, (byte) 84, (byte) 52, (byte) 83};

        ByteArrayInputStream is = new ByteArrayInputStream(arr);

        DataInputStream dis = new DataInputStream(is);

        float r = dis.readFloat();

        return r;

    }

    static double deserDouble() throws IOException {

        byte[] arr = {(byte)64, (byte)8, (byte)0, (byte)0, (byte)0, (byte)0, (byte)0, (byte)0};

        ByteArrayInputStream is = new ByteArrayInputStream(arr);

        DataInputStream dis = new DataInputStream(is);

        return dis.readDouble();

    }

    static long deserLong(byte[] arr) throws IOException {

        ByteArrayInputStream is = new ByteArrayInputStream(arr);

        DataInputStream dis = new DataInputStream(is);

        return dis.readLong();

    }

    static int deserInt() throws IOException {

        byte[] arr = {(byte) 71, (byte) 84, (byte) 52, (byte) 83};

        ByteArrayInputStream is = new ByteArrayInputStream(arr);

        DataInputStream dis = new DataInputStream(is);

        return dis.readInt();

    }

    static String intToString() {

        return new Integer(5).toString().toString();

    }

    static String floatToString() {

        return new Float(7.0).toString().toString();

    }

    public static long shlL(byte[] arrValue, int nBits) throws IOException {

        ByteArrayInputStream isValue = new ByteArrayInputStream(arrValue);

        DataInputStream disValue = new DataInputStream(isValue);

        return (disValue.readLong() << nBits);

    }

    public static long shrL(byte[] arrValue, int nBits) throws IOException {

        ByteArrayInputStream isValue = new ByteArrayInputStream(arrValue);

        DataInputStream disValue = new DataInputStream(isValue);

        return (disValue.readLong() >> nBits);

    }

    public static long ushrL(byte[] arrValue, int nBits) throws IOException {

        ByteArrayInputStream isValue = new ByteArrayInputStream(arrValue);

        DataInputStream disValue = new DataInputStream(isValue);

        return (disValue.readLong() >>> nBits);

    }

    public static long andL(byte[] arrX, byte[] arrY) throws IOException {

        ByteArrayInputStream isX = new ByteArrayInputStream(arrX);

        DataInputStream disX = new DataInputStream(isX);

        ByteArrayInputStream isY = new ByteArrayInputStream(arrY);

        DataInputStream disY = new DataInputStream(isY);

        return (disX.readLong() & disY.readLong());

    }

    public static long orL(byte[] arrX, byte[] arrY) throws IOException {

        ByteArrayInputStream isX = new ByteArrayInputStream(arrX);

        DataInputStream disX = new DataInputStream(isX);

        ByteArrayInputStream isY = new ByteArrayInputStream(arrY);

        DataInputStream disY = new DataInputStream(isY);

        return (disX.readLong() | disY.readLong());

    }

    public static long xorL(byte[] arrX, byte[] arrY) throws IOException {

        ByteArrayInputStream isX = new ByteArrayInputStream(arrX);

        DataInputStream disX = new DataInputStream(isX);

        ByteArrayInputStream isY = new ByteArrayInputStream(arrY);

        DataInputStream disY = new DataInputStream(isY);

        return (disX.readLong() ^ disY.readLong());

    }

    public static int compareL(byte[] arrX, byte[] arrY,

                               int zero) throws IOException {

        ByteArrayInputStream isX = new ByteArrayInputStream(arrX);

        DataInputStream disX = new DataInputStream(isX);

        ByteArrayInputStream isY = new ByteArrayInputStream(arrY);

        DataInputStream disY = new DataInputStream(isY);

        final long x = disX.readLong();

        final long y = disY.readLong();

        final int xyResult = compareL(x, y, zero);

        final int yxResult = compareL(y, x, zero);

        return ((xyResult + yxResult) == 0) ? xyResult : -2;

    }

    private static int compareL(long x, long y, int zero) {

        int result = -2;

        int trueCount = 0;

        x += zero;

        if (x == y) {

            result = 0;

            ++trueCount;

        }

        x += zero;

        if (x < y) {

            result = -1;

            ++trueCount;

        }

        x += zero;

        if (x > y) {

            result = 1;

            ++trueCount;

        }

        return (trueCount == 1) ? result : -2;

    }

}