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/*
 * Copyright (c) 2016-2022 chronicle.software
 *
 *     https://chronicle.software
 *
 * 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
 * limitations under the License.
 */
package net.openhft.chronicle.bytes.internal;

import net.openhft.chronicle.bytes.BytesStore;
import net.openhft.chronicle.bytes.VanillaBytes;
import net.openhft.chronicle.core.annotation.NonNegative;
import net.openhft.chronicle.core.io.ClosedIllegalStateException;
import org.jetbrains.annotations.NotNull;

import static net.openhft.chronicle.core.Jvm.uncheckedCast;

public class EmbeddedBytes extends VanillaBytes {
    private EmbeddedBytes(@NotNull BytesStore bytesStore, long writePosition, long writeLimit) throws IllegalStateException, IllegalArgumentException {
        super(bytesStore, writePosition, writeLimit);
    }

    public static  EmbeddedBytes wrap(BytesStore bytesStore) {
        return wrap(uncheckedCast(bytesStore));
    }

    public static  EmbeddedBytes wrap(HeapBytesStore bytesStore) {
        long wp = bytesStore.start();
        int length = bytesStore.readUnsignedByte(wp - 1);
        return new EmbeddedBytes<>(bytesStore, wp, wp + length);
    }

    @Override
    protected void uncheckedWritePosition(@NonNegative long writePosition) {
        super.uncheckedWritePosition(writePosition);
        bytesStore.writeUnsignedByte(lengthOffset(), (int) writePosition);
    }

    @Override
    public @NonNegative long writePosition() {
        try {
            return bytesStore.readUnsignedByte(lengthOffset());
        } catch (ClosedIllegalStateException ignored) {
            return 0;
        }
    }

    private long lengthOffset() {
        return bytesStore.start() - 1;
    }
}