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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.pulsar.broker.transaction.timeout;

import io.netty.util.Timeout;
import io.netty.util.Timer;
import io.netty.util.TimerTask;
import java.time.Clock;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.TimeUnit;
import lombok.extern.slf4j.Slf4j;
import org.apache.pulsar.broker.TransactionMetadataStoreService;
import org.apache.pulsar.client.api.transaction.TxnID;
import org.apache.pulsar.common.util.collections.TripleLongPriorityQueue;
import org.apache.pulsar.transaction.coordinator.TransactionTimeoutTracker;

/**
 * An timer-task implementation of {@link TransactionTimeoutTracker}.
 */
@Slf4j
public class TransactionTimeoutTrackerImpl implements TransactionTimeoutTracker, TimerTask {

    private final Timer timer;
    private final TripleLongPriorityQueue priorityQueue = new TripleLongPriorityQueue();
    private final long tickTimeMillis;
    private final Clock clock;
    private Timeout currentTimeout;
    private static final long INITIAL_TIMEOUT = 1L;

    private volatile long nowTaskTimeoutTime = INITIAL_TIMEOUT;
    private final long tcId;
    private final TransactionMetadataStoreService transactionMetadataStoreService;

    TransactionTimeoutTrackerImpl(long tcId, Timer timer, long tickTimeMillis,
                                  TransactionMetadataStoreService transactionMetadataStoreService) {
        this.tcId = tcId;
        this.transactionMetadataStoreService = transactionMetadataStoreService;
        this.timer = timer;
        this.tickTimeMillis  = tickTimeMillis;
        this.clock = Clock.systemUTC();
    }

    @Override
    public CompletableFuture addTransaction(long sequenceId, long timeout) {
        if (timeout < tickTimeMillis) {
            this.transactionMetadataStoreService.endTransactionForTimeout(new TxnID(tcId, sequenceId));
            return CompletableFuture.completedFuture(false);
        }
        synchronized (this){
            long nowTime = clock.millis();
            long transactionTimeoutTime = nowTime + timeout;
            priorityQueue.add(transactionTimeoutTime, tcId, sequenceId);
            if (this.currentTimeout == null) {
                currentTimeout = timer.newTimeout(this, timeout, TimeUnit.MILLISECONDS);
                nowTaskTimeoutTime = transactionTimeoutTime;
            } else if (nowTaskTimeoutTime > transactionTimeoutTime) {
                if (currentTimeout.cancel() || currentTimeout.isExpired()) {
                    currentTimeout = timer.newTimeout(this, timeout, TimeUnit.MILLISECONDS);
                    nowTaskTimeoutTime = transactionTimeoutTime;
                }
            } else if (currentTimeout.isExpired()) {
                currentTimeout = timer.newTimeout(this, timeout, TimeUnit.MILLISECONDS);
                nowTaskTimeoutTime = transactionTimeoutTime;
            }
        }
        return CompletableFuture.completedFuture(false);
    }

    @Override
    public void replayAddTransaction(long sequenceId, long timeout) {
        priorityQueue.add(timeout, tcId, sequenceId);
    }

    @Override
    public void start() {
        synchronized (this) {
            if (currentTimeout == null && !priorityQueue.isEmpty()) {
                this.currentTimeout = this.timer.newTimeout(this,
                        priorityQueue.peekN1() - this.clock.millis(), TimeUnit.MILLISECONDS);
                this.nowTaskTimeoutTime = priorityQueue.peekN1();
            }
        }
    }

    @Override
    public void close() {
        priorityQueue.close();
        if (this.currentTimeout != null) {
            this.currentTimeout.cancel();
        }
    }

    @Override
    public void run(Timeout timeout) {
        synchronized (this){
            while (!priorityQueue.isEmpty()){
                long timeoutTime = priorityQueue.peekN1();
                long nowTime = clock.millis();
                if (timeoutTime < nowTime){
                    transactionMetadataStoreService.endTransactionForTimeout(new TxnID(priorityQueue.peekN2(),
                            priorityQueue.peekN3()));
                    priorityQueue.pop();
                } else {
                    currentTimeout = timer
                            .newTimeout(this, timeoutTime - clock.millis(), TimeUnit.MILLISECONDS);
                    nowTaskTimeoutTime = timeoutTime;
                    break;
                }
            }
        }
    }
}