/*
 * Decompiled with CFR 0.152.
 * 
 * Could not load the following classes:
 *  org.apache.commons.lang3.Validate
 */
package net.minecraft.util.datafix;

import net.minecraft.util.Mth;
import org.apache.commons.lang3.Validate;

public class PackedBitStorage {
    private static final int BIT_TO_LONG_SHIFT = 6;
    private final long[] data;
    private final int bits;
    private final long mask;
    private final int size;

    public PackedBitStorage(int bits, int size) {
        this(bits, size, new long[Mth.roundToward(size * bits, 64) / 64]);
    }

    public PackedBitStorage(int bits, int size, long[] data) {
        Validate.inclusiveBetween((long)1L, (long)32L, (long)bits);
        this.size = size;
        this.bits = bits;
        this.data = data;
        this.mask = (1L << bits) - 1L;
        int requiredLength = Mth.roundToward(size * bits, 64) / 64;
        if (data.length != requiredLength) {
            throw new IllegalArgumentException("Invalid length given for storage, got: " + data.length + " but expected: " + requiredLength);
        }
    }

    public void set(int index, int value) {
        Validate.inclusiveBetween((long)0L, (long)(this.size - 1), (long)index);
        Validate.inclusiveBetween((long)0L, (long)this.mask, (long)value);
        int position = index * this.bits;
        int startData = position >> 6;
        int endData = (index + 1) * this.bits - 1 >> 6;
        int startBit = position ^ startData << 6;
        this.data[startData] = this.data[startData] & (this.mask << startBit ^ 0xFFFFFFFFFFFFFFFFL) | ((long)value & this.mask) << startBit;
        if (startData != endData) {
            int shiftBits = 64 - startBit;
            int wantedBits = this.bits - shiftBits;
            this.data[endData] = this.data[endData] >>> wantedBits << wantedBits | ((long)value & this.mask) >> shiftBits;
        }
    }

    public int get(int index) {
        Validate.inclusiveBetween((long)0L, (long)(this.size - 1), (long)index);
        int position = index * this.bits;
        int startData = position >> 6;
        int endData = (index + 1) * this.bits - 1 >> 6;
        int startBit = position ^ startData << 6;
        if (startData == endData) {
            return (int)(this.data[startData] >>> startBit & this.mask);
        }
        int shiftBits = 64 - startBit;
        return (int)((this.data[startData] >>> startBit | this.data[endData] << shiftBits) & this.mask);
    }

    public long[] getRaw() {
        return this.data;
    }

    public int getBits() {
        return this.bits;
    }
}