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/*
 * (c) Copyright 2018 Palantir Technologies Inc. All rights reserved.
 *
 * 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 com.palantir.atlasdb.keyvalue.api;

import com.palantir.atlasdb.encoding.PtBytes;
import com.palantir.common.persist.Persistable;
import com.palantir.logsafe.exceptions.SafeIllegalArgumentException;
import java.util.Arrays;
import org.immutables.value.Value.Immutable;
import org.immutables.value.Value.Parameter;

@Immutable
public interface StoredWriteReference extends Persistable {
    Hydrator BYTES_HYDRATOR = ImmutableStoredWriteReference::of;

    default  T accept(Visitor visitor) {
        byte[] data = data();
        if (Arrays.equals(data, PtBytes.EMPTY_BYTE_ARRAY)) {
            return visitor.visitDummy();
        }
        switch (data[0]) {
            case 0:
                return visitor.visitTableNameAsStringBinary(data);
            case 1:
                return visitor.visitTableIdBinary(data);
            case '{':
                return visitor.visitJson(data);
            default:
                throw new SafeIllegalArgumentException(
                        "Data stored in targeted sweep queue was not recognised as a known data format");
        }
    }

    @Override
    default byte[] persistToBytes() {
        return data();
    }

    @Parameter
    byte[] data();

    interface Visitor {
        T visitJson(byte[] ref);

        T visitTableNameAsStringBinary(byte[] ref);

        T visitTableIdBinary(byte[] ref);

        T visitDummy();
    }
}