/*
 * ChunkAPI
 *
 * Copyright (C) 2023-2025 FalsePattern, The MEGA Team, LegacyModdingMC contributors
 * All Rights Reserved
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, only version 3 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

package com.falsepattern.chunk.internal;

public class BlockPosUtil {
    private static final int NUM_X_BITS = 26;
    private static final int NUM_Z_BITS = 26;
    private static final int NUM_Y_BITS = 64 - NUM_X_BITS - NUM_Z_BITS;
    private static final long Y_MASK = (1L << NUM_Y_BITS) - 1L;
    private static final int Y_SHIFT = NUM_Z_BITS;
    private static final int X_SHIFT = Y_SHIFT + NUM_Y_BITS;
    private static final long Z_MASK = (1L << NUM_Z_BITS) - 1L;
    private static final long X_MASK = (1L << NUM_X_BITS) - 1L;

    public static long packToLong(int x, int y, int z) {
        return ((long) x & X_MASK) << X_SHIFT | ((long) y & Y_MASK) << Y_SHIFT | ((long) z & Z_MASK);
    }

    public static int getX(long packed) {
        return (int) (packed << 64 - X_SHIFT - NUM_X_BITS >> 64 - NUM_X_BITS);
    }

    public static int getY(long packed) {
        return (int) (packed << 64 - Y_SHIFT - NUM_Y_BITS >> 64 - NUM_Y_BITS);
    }

    public static int getZ(long packed) {
        return (int) (packed << 64 - NUM_Z_BITS >> 64 - NUM_Z_BITS);
    }
}