/*
 * Copyright (c) 2019-2020 GeyserMC. http://geysermc.org
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * @author GeyserMC
 * @link https://github.com/GeyserMC/Geyser
 */

package org.geysermc.connector.network.translators.world.chunk;

import com.nukkitx.network.util.Preconditions;

public class NibbleArray implements Cloneable {

    private final byte[] data;

    public NibbleArray(int length) {
        data = new byte[length / 2];
    }

    public NibbleArray(byte[] array) {
        data = array;
    }

    public byte get(int index) {
        Preconditions.checkElementIndex(index, data.length * 2);
        byte val = data[index / 2];
        if ((index & 1) == 0) {
            return (byte) (val & 0x0f);
        } else {
            return (byte) ((val & 0xf0) >>> 4);
        }
    }

    public void set(int index, byte value) {
        Preconditions.checkArgument(value >= 0 && value < 16, "Nibbles must have a value between 0 and 15.");
        Preconditions.checkElementIndex(index, data.length * 2);
        value &= 0xf;
        int half = index / 2;
        byte previous = data[half];
        if ((index & 1) == 0) {
            data[half] = (byte) (previous & 0xf0 | value);
        } else {
            data[half] = (byte) (previous & 0x0f | value << 4);
        }
    }

    public void fill(byte value) {
        Preconditions.checkArgument(value >= 0 && value < 16, "Nibbles must have a value between 0 and 15.");
        value &= 0xf;
        for (int i = 0; i < data.length; i++) {
            data[i] = (byte) ((value << 4) | value);
        }
    }

    public void copyFrom(byte[] bytes) {
        Preconditions.checkNotNull(bytes, "bytes");
        Preconditions.checkArgument(bytes.length == data.length, "length of provided byte array is %s but expected %s", bytes.length,
                data.length);
        System.arraycopy(bytes, 0, data, 0, data.length);
    }

    public void copyFrom(NibbleArray array) {
        Preconditions.checkNotNull(array, "array");
        copyFrom(array.data);
    }

    public byte[] getData() {
        return data;
    }

    public NibbleArray copy() {
        return new NibbleArray(getData().clone());
    }
}