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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.flink.cep.nfa.sharedbuffer;

import org.apache.flink.api.common.typeutils.SimpleTypeSerializerSnapshot;
import org.apache.flink.api.common.typeutils.TypeSerializer;
import org.apache.flink.api.common.typeutils.TypeSerializerSnapshot;
import org.apache.flink.api.common.typeutils.base.TypeSerializerSingleton;
import org.apache.flink.core.memory.DataInputView;
import org.apache.flink.core.memory.DataOutputView;

import java.io.IOException;
import java.util.Comparator;
import java.util.Objects;

/** Composite key for events in {@link SharedBuffer}. */
public class EventId implements Comparable {
    private final int id;
    private final long timestamp;

    public EventId(int id, long timestamp) {
        this.id = id;
        this.timestamp = timestamp;
    }

    public int getId() {
        return id;
    }

    public long getTimestamp() {
        return timestamp;
    }

    public static final Comparator COMPARATOR =
            Comparator.comparingLong(EventId::getTimestamp).thenComparingInt(EventId::getId);

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }
        EventId eventId = (EventId) o;
        return id == eventId.id && timestamp == eventId.timestamp;
    }

    @Override
    public int hashCode() {
        return Objects.hash(id, timestamp);
    }

    @Override
    public String toString() {
        return "EventId{" + "id=" + id + ", timestamp=" + timestamp + '}';
    }

    @Override
    public int compareTo(EventId o) {
        return COMPARATOR.compare(this, o);
    }

    /** {@link TypeSerializer} for {@link EventId}. */
    public static class EventIdSerializer extends TypeSerializerSingleton {

        private static final long serialVersionUID = -5685733582601394497L;

        private EventIdSerializer() {}

        public static final EventIdSerializer INSTANCE = new EventIdSerializer();

        @Override
        public boolean isImmutableType() {
            return true;
        }

        @Override
        public EventId createInstance() {
            return null;
        }

        @Override
        public EventId copy(EventId from) {
            return new EventId(from.id, from.timestamp);
        }

        @Override
        public EventId copy(EventId from, EventId reuse) {
            return copy(from);
        }

        @Override
        public int getLength() {
            return Integer.BYTES + Long.BYTES;
        }

        @Override
        public void serialize(EventId record, DataOutputView target) throws IOException {
            target.writeInt(record.id);
            target.writeLong(record.timestamp);
        }

        @Override
        public EventId deserialize(DataInputView source) throws IOException {
            int id = source.readInt();
            long timestamp = source.readLong();

            return new EventId(id, timestamp);
        }

        @Override
        public EventId deserialize(EventId reuse, DataInputView source) throws IOException {
            return deserialize(source);
        }

        @Override
        public void copy(DataInputView source, DataOutputView target) throws IOException {
            target.writeInt(source.readInt());
            target.writeLong(source.readLong());
        }

        // -----------------------------------------------------------------------------------

        @Override
        public TypeSerializerSnapshot snapshotConfiguration() {
            return new EventIdSerializerSnapshot();
        }

        /** Serializer configuration snapshot for compatibility and format evolution. */
        @SuppressWarnings("WeakerAccess")
        public static final class EventIdSerializerSnapshot
                extends SimpleTypeSerializerSnapshot {

            public EventIdSerializerSnapshot() {
                super(() -> INSTANCE);
            }
        }
    }
}