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/*
 * Copyright (c) 2020, 2020, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * The Universal Permissive License (UPL), Version 1.0
 *
 * Subject to the condition set forth below, permission is hereby granted to any
 * person obtaining a copy of this software, associated documentation and/or
 * data (collectively the "Software"), free of charge and under any and all
 * copyright rights in the Software, and any and all patent rights owned or
 * freely licensable by each licensor hereunder covering either (i) the
 * unmodified Software as contributed to or provided by such licensor, or (ii)
 * the Larger Works (as defined below), to deal in both
 *
 * (a) the Software, and
 *
 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
 * one is included with the Software each a "Larger Work" to which the Software
 * is contributed by such licensors),
 *
 * without restriction, including without limitation the rights to copy, create
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 * Software and the Larger Work(s), and to sublicense the foregoing rights on
 * either these or other terms.
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 * This license is subject to the following condition:
 *
 * The above copyright notice and either this complete permission notice or at a
 * minimum a reference to the UPL must be included in all copies or substantial
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 *
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 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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package com.oracle.truffle.js.runtime.array;

import java.nio.ByteBuffer;
import java.nio.ByteOrder;

abstract class ByteBufferAccess {

    @SuppressWarnings("static-method")
    public final int getInt8(ByteBuffer buffer, int index) {
        return buffer.get(index);
    }

    public final int getUint8(ByteBuffer buffer, int index) {
        return getInt8(buffer, index) & 0xff;
    }

    public abstract int getInt16(ByteBuffer buffer, int index);

    public final int getUint16(ByteBuffer buffer, int index) {
        return getInt16(buffer, index) & 0xffff;
    }

    public abstract int getInt32(ByteBuffer buffer, int index);

    public final long getUint32(ByteBuffer buffer, int index) {
        return getInt32(buffer, index) & 0xffffffffL;
    }

    public abstract float getFloat(ByteBuffer buffer, int index);

    public abstract double getDouble(ByteBuffer buffer, int index);

    public abstract long getInt64(ByteBuffer buffer, int index);

    @SuppressWarnings("static-method")
    public final void putInt8(ByteBuffer buffer, int index, int value) {
        buffer.put(index, (byte) value);
    }

    public abstract void putInt16(ByteBuffer buffer, int index, int value);

    public abstract void putInt32(ByteBuffer buffer, int index, int value);

    public abstract void putFloat(ByteBuffer buffer, int index, float value);

    public abstract void putDouble(ByteBuffer buffer, int index, double value);

    public abstract void putInt64(ByteBuffer buffer, int index, long value);

    static final ByteBufferAccess littleEndian() {
        return ByteBufferSupport.littleEndian();
    }

    static final ByteBufferAccess bigEndian() {
        return ByteBufferSupport.bigEndian();
    }

    static final ByteBufferAccess nativeOrder() {
        return ByteBufferSupport.nativeOrder();
    }

    static final ByteBufferAccess forOrder(boolean littleEndian) {
        return littleEndian ? littleEndian() : bigEndian();
    }
}

abstract class AbstractByteBufferAccess extends ByteBufferAccess {

    @Override
    public final int getInt16(ByteBuffer buffer, int index) {
        return wrap(buffer).getShort(index);
    }

    @Override
    public final int getInt32(ByteBuffer buffer, int index) {
        return wrap(buffer).getInt(index);
    }

    @Override
    public final float getFloat(ByteBuffer buffer, int index) {
        return wrap(buffer).getFloat(index);
    }

    @Override
    public final double getDouble(ByteBuffer buffer, int index) {
        return wrap(buffer).getDouble(index);
    }

    @Override
    public long getInt64(ByteBuffer buffer, int index) {
        return wrap(buffer).getLong(index);
    }

    @Override
    public final void putInt16(ByteBuffer buffer, int index, int value) {
        wrap(buffer).putShort(index, (short) value);
    }

    @Override
    public final void putInt32(ByteBuffer buffer, int index, int value) {
        wrap(buffer).putInt(index, value);
    }

    @Override
    public final void putInt64(ByteBuffer buffer, int index, long value) {
        wrap(buffer).putLong(index, value);
    }

    @Override
    public final void putFloat(ByteBuffer buffer, int index, float value) {
        wrap(buffer).putFloat(index, value);
    }

    @Override
    public final void putDouble(ByteBuffer buffer, int index, double value) {
        wrap(buffer).putDouble(index, value);
    }

    protected ByteBuffer wrap(ByteBuffer buffer) {
        return buffer;
    }
}

final class NativeByteBufferAccess extends AbstractByteBufferAccess {
    static final ByteBufferAccess INSTANCE = new NativeByteBufferAccess();

    @Override
    protected ByteBuffer wrap(ByteBuffer buffer) {
        return buffer.duplicate().order(ByteOrder.nativeOrder());
    }
}

final class LittleEndianByteBufferAccess extends AbstractByteBufferAccess {
    static final ByteBufferAccess INSTANCE = new LittleEndianByteBufferAccess();

    @Override
    protected ByteBuffer wrap(ByteBuffer buffer) {
        return buffer.duplicate().order(ByteOrder.LITTLE_ENDIAN);
    }
}

final class BigEndianByteBufferAccess extends AbstractByteBufferAccess {
    static final ByteBufferAccess INSTANCE = new BigEndianByteBufferAccess();

    @Override
    protected ByteBuffer wrap(ByteBuffer buffer) {
        return buffer.duplicate().order(ByteOrder.BIG_ENDIAN);
    }
}