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 *
 *  Copyright (c) 2014-2019 Appsicle
 *  Copyright (c) 2019-2023 QuestDB
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
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package io.questdb.std;

import io.questdb.std.str.CharSinkBase;
import io.questdb.std.str.Sinkable;
import io.questdb.std.str.StringSink;
import org.jetbrains.annotations.NotNull;

public class Long256Impl implements Long256, Sinkable {

    public static final Long256Impl NULL_LONG256 = new Long256Impl();
    public static final Long256Impl ZERO_LONG256 = new Long256Impl();

    private long l0;
    private long l1;
    private long l2;
    private long l3;

    public static Long256Impl add(final Long256Impl sum, final Long256 x, final Long256 y) {
        if (x.equals(Long256Impl.NULL_LONG256) || y.equals(Long256Impl.NULL_LONG256)) {
            return Long256Impl.NULL_LONG256;
        }
        sum.copyFrom(x);
        Long256Util.add(sum, y);
        return sum;
    }

    public static boolean isNull(Long256 value) {
        return Long256Impl.NULL_LONG256.equals(value);
    }

    public static void putNull(long appendPointer) {
        Unsafe.getUnsafe().putLong(appendPointer, NULL_LONG256.getLong0());
        Unsafe.getUnsafe().putLong(appendPointer + Long.BYTES, NULL_LONG256.getLong1());
        Unsafe.getUnsafe().putLong(appendPointer + Long.BYTES * 2, NULL_LONG256.getLong2());
        Unsafe.getUnsafe().putLong(appendPointer + Long.BYTES * 3, NULL_LONG256.getLong3());
    }

    public void copyFrom(Long256 value) {
        this.l0 = value.getLong0();
        this.l1 = value.getLong1();
        this.l2 = value.getLong2();
        this.l3 = value.getLong3();
    }

    @SuppressWarnings("EqualsWhichDoesntCheckParameterClass")
    @Override
    public boolean equals(Object obj) {
        final Long256Impl that = (Long256Impl) obj;
        return l0 == that.l0 && l1 == that.l1 && l2 == that.l2 && l3 == that.l3;
    }

    public void fromRnd(Rnd rnd) {
        setAll(
                rnd.nextLong(),
                rnd.nextLong(),
                rnd.nextLong(),
                rnd.nextLong()
        );
    }

    @Override
    public long getLong0() {
        return l0;
    }

    @Override
    public long getLong1() {
        return l1;
    }

    @Override
    public long getLong2() {
        return l2;
    }

    @Override
    public long getLong3() {
        return l3;
    }

    @Override
    public void setAll(long l0, long l1, long l2, long l3) {
        this.l0 = l0;
        this.l1 = l1;
        this.l2 = l2;
        this.l3 = l3;
    }

    @Override
    public void toSink(@NotNull CharSinkBase sink) {
        Numbers.appendLong256(l0, l1, l2, l3, sink);
    }

    @Override
    public String toString() {
        StringSink sink = new StringSink();
        toSink(sink);
        return sink.toString();
    }

    static {
        NULL_LONG256.setAll(
                Numbers.LONG_NaN,
                Numbers.LONG_NaN,
                Numbers.LONG_NaN,
                Numbers.LONG_NaN
        );
        ZERO_LONG256.setAll(0, 0, 0, 0);
    }
}