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#include <QJsonArray>
#include <QJsonObject>
#include <QtDebug>
#include <QString>
#include <unistd.h>
#include <iostream>
#include <vector>
#include <algorithm>
#include <QtCore>
#include <responsemessage.h>
#include <callmessage.h>
#include <messagefactory.h>
#include <messageenginefactory.h>
#include "taskmanager.h"

TaskManager::TaskManager(QObject* parent) : QObject(parent), m_loop(nullptr) {
}

TaskManager::~TaskManager() {
}

void TaskManager::open(const QUrl &bindingAddress)
{
	qRegisterMetaType<std::shared_ptr<Message>>("std::shared_ptr<Message>");
	m_loop.reset();
	m_loop = MessageEngineFactory::getInstance().getMessageEngine(bindingAddress);
	QObject::connect(m_loop.get(), &MessageEngine::connected, this, &TaskManager::onConnected);
	QObject::connect(m_loop.get(), &MessageEngine::messageReceived, this, &TaskManager::onMessageReceived, Qt::QueuedConnection);
}

void TaskManager::onConnected()
{
	query(); // let's not wait 3 seconds and issue the first call directly
	timer = new QTimer();
	connect(timer, SIGNAL(timeout()), this, SLOT(query()));
	timer->start(3000);

	loadAvg();
	loadAvgTimer = new QTimer();
	connect(loadAvgTimer, SIGNAL(timeout()), this, SLOT(loadAvg()));
	loadAvgTimer->start(1000);
}
void TaskManager::kill(int tid) {
	callService("kill_process", QJsonValue(tid));
}

void TaskManager::getExtraInfo(int tid) {
	callService("get_extra_info", QJsonValue(tid));
}

void TaskManager::loadAvg() {
	callService("get_load_avg", QJsonValue());
}

void TaskManager::query() {
	callService("get_process_list",
		QJsonValue(QJsonObject({{"processes", QJsonValue()}})));
	callService("get_netstat", QJsonValue());
}

void TaskManager::callService(const QString& command, QJsonValue value) {
	std::unique_ptr<Message> message = MessageFactory::getInstance().createOutboundMessage(MessageId::Call);
	if (!message)
		return;
	CallMessage* msg = static_cast<CallMessage*>(message.get());
	msg->createRequest("taskmanager", command, value);
	qDebug() << "sending message " << msg->serialize();
	m_loop->sendMessage(std::move(message));
}

void TaskManager::onMessageReceived(std::shared_ptr<Message> message)
{
	if (!message)
		return;

	if (message->isReply())
		ProcessResponse(message);
}

void TaskManager::ProcessResponse(std::shared_ptr<Message> message)
{
	std::shared_ptr<ResponseMessage> rmsg = std::static_pointer_cast<ResponseMessage>(message);
	qDebug() << "got message ";
	QString verb = rmsg->requestVerb();
	if (rmsg->replyStatus() == "failed") {
		qWarning() << "Reply Failed received for verb:" << verb;
		return;
	}

	QJsonObject data = rmsg->replyData();
	QString msgType = data.value("msgType").toString();
	if (msgType.isNull())
		return; // no type supplied, ignoring

	if (QString::compare(msgType, "processList") == 0) {
		QJsonArray processes = data.value("processes").toArray();
		ProcessResponseTasklist(processes);
	}
	else if (QString::compare(msgType, "extraInfo") == 0) {
		QJsonObject info = data.value("info").toObject();
		ProcessResponseExtraInfo(info);
	}
	else if (QString::compare(msgType, "loadAvgInfo") == 0) {
		QJsonObject loadInfo = data.value("loadInfo").toObject();
		ProcessResponseLoadAvg(loadInfo);
	}
	else if (QString::compare(msgType, "netStatInfo") == 0) {
		QJsonObject netstat = data.value("netstat").toObject();
		ProcessResponseNetStat(netstat);
	}
	// more response types to follow
}

void TaskManager::ProcessResponseTasklist(QJsonArray& processes)
{
	std::vector<ProcInfo> procs;

	if (processes.size() == 0)
		return;

	for(auto it = processes.constBegin(); it != processes.constEnd(); ++it) {
		if (!it->toObject().isEmpty())
			procs.emplace_back(it->toObject());
	}

	if (procs.empty())
		return;

	for(auto &item : procs) {
		if(m_procinfos.empty()) {
			// if old vector is empty, no need to update or remove elements, just add them
			emit addProcess(item.cmd(), item.tid(), item.euid(), item.scpu(), item.ucpu(), item.resident_memory(), item.state());
		} else {
			std::vector<ProcInfo>::iterator it = std::find_if(m_procinfos.begin(), m_procinfos.end(),
									  [item](const ProcInfo& proc) {
									    return item.tid() == proc.tid(); });
			if (it != m_procinfos.end()) {  // the same ID exists in both vectors
				if (item.cmd() != it->cmd()) {  // but different names:
					// the process in m_procinfos has died and a new one has its ID
					qDebug() << "The process ID has been reused for another process";
				}
				emit updateProcess(item.cmd(), item.tid(), item.euid(), item.scpu(), item.ucpu(), item.resident_memory(), item.state());
				m_procinfos.erase(it);
			} else { // if the ID  was not found in old vector, that means it's a new process
				qDebug() << item.cmd() << " new process has been added";
				emit addProcess(item.cmd(), item.tid(), item.euid(), item.scpu(), item.ucpu(), item.resident_memory(), item.state());
			}
		}
	}
	// any remaining processes in old vector are all dead, remove them:
	for(auto &olditem : m_procinfos) {
		emit removeProcess(olditem.tid());
	}

	m_procinfos.swap(procs);
}

void TaskManager::ProcessResponseExtraInfo(QJsonObject &info)
{
	QString infoString;

	if (info.size() == 0) {
		// this is not a valid process list response
		QTextStream(&infoString) << "procces is not available";
	} else {
		infoString = "Task : " + info["cmd"].toString() + "\n"
			+ "Exec start : " + info["exec_start"].toString() + "\n"
			+ "Exec runtime : " + info["vruntime"].toString() + "\n"
			+ "Prio : " + info["prio"].toString();
	}

	emit showProcessInfo(infoString);
}

void TaskManager::ProcessResponseLoadAvg(QJsonObject &loadInfo)
{
	if (loadInfo.size() == 0) {
		return;
	}

	emit updateLoadAverage(loadInfo["value"].toDouble());
}

void TaskManager::ProcessResponseNetStat(QJsonObject &netstat)
{
	if (netstat.size() == 0) {
		return;
	}

	unsigned int newInOctets = netstat["InOctets"].toInt();
	unsigned int newOutOctets = netstat["OutOctets"].toInt();

	emit updateNetworkStats(newInOctets - inOctets, newOutOctets - outOctets);
	inOctets = newInOctets;
	outOctets = newOutOctets;
}