//
//  ReceivedPacketProcessor.cpp
//  libraries/networking/src
//
//  Created by Brad Hefta-Gaub on 8/12/13.
//  Copyright 2013 High Fidelity, Inc.
//
//  Distributed under the Apache License, Version 2.0.
//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
//

#include <NumericalConstants.h>

#include "NodeList.h"
#include "ReceivedPacketProcessor.h"
#include "SharedUtil.h"

ReceivedPacketProcessor::ReceivedPacketProcessor() {
    _lastWindowAt = usecTimestampNow();
}


void ReceivedPacketProcessor::terminating() {
    _hasPackets.wakeAll();
}

void ReceivedPacketProcessor::queueReceivedPacket(QSharedPointer<NLPacket> packet, SharedNodePointer sendingNode) {
    lock();
    _packets.push_back({ sendingNode, packet });
    _nodePacketCounts[sendingNode->getUUID()]++;
    _lastWindowIncomingPackets++;
    unlock();

    // Make sure to wake our actual processing thread because we now have packets for it to process.
    _hasPackets.wakeAll();
}

bool ReceivedPacketProcessor::process() {
    quint64 now = usecTimestampNow();
    quint64 sinceLastWindow = now - _lastWindowAt;

    if (sinceLastWindow > USECS_PER_SECOND) {
        lock();
        float secondsSinceLastWindow = sinceLastWindow / USECS_PER_SECOND;
        float incomingPacketsPerSecondInWindow = (float)_lastWindowIncomingPackets / secondsSinceLastWindow;
        _incomingPPS.updateAverage(incomingPacketsPerSecondInWindow);

        float processedPacketsPerSecondInWindow = (float)_lastWindowProcessedPackets / secondsSinceLastWindow;
        _processedPPS.updateAverage(processedPacketsPerSecondInWindow);

        _lastWindowAt = now;
        _lastWindowIncomingPackets = 0;
        _lastWindowProcessedPackets = 0;
        unlock();
    }

    if (_packets.size() == 0) {
        _waitingOnPacketsMutex.lock();
        _hasPackets.wait(&_waitingOnPacketsMutex, getMaxWait());
        _waitingOnPacketsMutex.unlock();
    }

    preProcess();
    if (!_packets.size()) {
        return isStillRunning();
    }

    lock();
    std::list<NodeSharedPacketPair> currentPackets;
    currentPackets.swap(_packets);
    unlock();

    for(auto& packetPair : currentPackets) {
        processPacket(packetPair.second, packetPair.first);
        _lastWindowProcessedPackets++;
        midProcess();
    }

    lock();
    for(auto& packetPair : currentPackets) {
        _nodePacketCounts[packetPair.first->getUUID()]--;
    }
    unlock();

    postProcess();
    return isStillRunning();  // keep running till they terminate us
}

void ReceivedPacketProcessor::nodeKilled(SharedNodePointer node) {
    lock();
    _nodePacketCounts.remove(node->getUUID());
    unlock();
}