/**

 * 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.bck2brwsr.tck;

import org.apidesign.bck2brwsr.core.JavaScriptBody;

import org.apidesign.bck2brwsr.vmtest.Compare;

import org.apidesign.bck2brwsr.vmtest.VMTest;

import org.testng.annotations.Factory;

/**

 *

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

 */

public class ByteArithmeticTest {

    private static byte add(byte x, byte y) {

        return (byte)(x + y);

    }

    private static byte sub(byte x, byte y) {

        return (byte)(x - y);

    }

    private static byte mul(byte x, byte y) {

        return (byte)(x * y);

    }

    private static byte div(byte x, byte y) {

        return (byte)(x / y);

    }

    private static byte mod(byte x, byte y) {

        return (byte)(x % y);

    }

    @Compare public byte conversion() {

        return (byte)123456;

    }

    @Compare public byte addOverflow() {

        return add(Byte.MAX_VALUE, (byte)1);

    }

    @Compare public byte subUnderflow() {

        return sub(Byte.MIN_VALUE, (byte)1);

    }

    @Compare public byte addMaxByteAndMaxByte() {

        return add(Byte.MAX_VALUE, Byte.MAX_VALUE);

    }

    @Compare public byte subMinByteAndMinByte() {

        return sub(Byte.MIN_VALUE, Byte.MIN_VALUE);

    }

    @Compare public byte multiplyMaxByte() {

        return mul(Byte.MAX_VALUE, (byte)2);

    }

    @Compare public byte multiplyMaxByteAndMaxByte() {

        return mul(Byte.MAX_VALUE, Byte.MAX_VALUE);

    }

    @Compare public byte multiplyMinByte() {

        return mul(Byte.MIN_VALUE, (byte)2);

    }

    @Compare public byte multiplyMinByteAndMinByte() {

        return mul(Byte.MIN_VALUE, Byte.MIN_VALUE);

    }

    @Compare public byte multiplyPrecision() {

        return mul((byte)17638, (byte)1103);

    }

    @Compare public byte division() {

        return div((byte)1, (byte)2);

    }

    @Compare public byte divisionReminder() {

        return mod((byte)1, (byte)2);

    }

    private static int readShort(byte[] byteCodes, int offset) {

        int signed = byteCodes[offset];

        byte b0 = (byte)signed;

        return (b0 << 8) | (byteCodes[offset + 1] & 0xff);

    }

    private static int readShortArg(byte[] byteCodes, int offsetInstruction) {

        return readShort(byteCodes, offsetInstruction + 1);

    }

    @Compare public int readIntArgs255and156() {

        final byte[] arr = new byte[] { (byte)0, (byte)255, (byte)156 };

        assert arr[1] == -1 : "First byte: " + arr[1];

        assert arr[2] == -100 : "Second byte: " + arr[2];

        final int ret = readShortArg(arr, 0);

        assert ret < 65000: "Value: " + ret;

        return ret;

    }

    @JavaScriptBody(args = { "arr" }, body = "arr[1] = 255; arr[2] = 156; return arr;")

    private static byte[] fill255and156(byte[] arr) {

        arr[1] = (byte)255;

        arr[2] = (byte)156;

        return arr;

    }

    @Compare public int readIntArgs255and156JSArray() {

        final byte[] arr = fill255and156(new byte[] { 0, 0, 0 });

        final int ret = readShortArg(arr, 0);

        assert ret < 65000: "Value: " + ret;

        return ret;

    }

    @Compare public int readIntArgsMinus1andMinus100() {

        final byte[] arr = new byte[] { (byte)0, (byte)-1, (byte)-100 };

        assert arr[1] == -1 : "First byte: " + arr[1];

        assert arr[2] == -100 : "Second byte: " + arr[2];

        return readShortArg(arr, 0);

    }

    @Factory

    public static Object[] create() {

        return VMTest.create(ByteArithmeticTest.class);

    }

}