/*

  Copyright (c) 2015, 2016 Hubert Denkmair <hubert@denkmair.de>

  This file is part of cangaroo.

  cangaroo is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 2 of the License, or
  (at your option) any later version.

  cangaroo is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with cangaroo.  If not, see <http://www.gnu.org/licenses/>.

*/

#include "Backend.h"
#include "LogModel.h"

#include <QDateTime>
#include <QDebug>
#include <QFile>

#include <core/CanTrace.h>
#include <core/MeasurementSetup.h>
#include <core/MeasurementNetwork.h>
#include <core/MeasurementInterface.h>
#include <driver/CanDriver.h>
#include <driver/CanInterface.h>
#include <driver/CanListener.h>
#include <parser/dbc/DbcParser.h>

Backend *Backend::_instance = 0;

Backend::Backend()
  : QObject(0),
    _measurementRunning(false),
    _measurementStartTime(0),
    _setup(this)
{
    _logModel = new LogModel(*this);

    setDefaultSetup();
    _trace = new CanTrace(*this, this, 100);

    connect(&_setup, SIGNAL(onSetupChanged()), this, SIGNAL(onSetupChanged()));
}

Backend &Backend::instance()
{
    if (!_instance) {
        _instance = new Backend;
    }
    return *_instance;
}

Backend::~Backend()
{
    delete _trace;
}

void Backend::addCanDriver(CanDriver &driver)
{
    driver.init(_drivers.size());
    _drivers.append(&driver);
}

bool Backend::startMeasurement()
{
    log_info("Starting measurement");

    _measurementStartTime = QDateTime::currentMSecsSinceEpoch();
    _timerSinceStart.start();

    int i=0;
    foreach (MeasurementNetwork *network, _setup.getNetworks()) {
        i++;
        foreach (MeasurementInterface *mi, network->interfaces()) {

            CanInterface *intf = getInterfaceById(mi->canInterface());
            if (intf) {
                intf->applyConfig(*mi);

                log_info(QString("Listening on interface: %1").arg(intf->getName()));
                CanListener *listener = new CanListener(0, *this, *intf);
                listener->startThread();
                _listeners.append(listener);
            }
        }
    }

    _measurementRunning = true;
    emit beginMeasurement();
    return true;
}

bool Backend::stopMeasurement()
{
    if (_measurementRunning) {
        foreach (CanListener *listener, _listeners) {
            listener->requestStop();
        }

        foreach (CanListener *listener, _listeners) {
            log_info(QString("Closing interface: %1").arg(getInterfaceName(listener->getInterfaceId())));
            listener->waitFinish();
        }

        qDeleteAll(_listeners);
        _listeners.clear();

        log_info("Measurement stopped");

        _measurementRunning = false;

        emit endMeasurement();
    }
    return true;
}

bool Backend::isMeasurementRunning() const
{
    return _measurementRunning;
}

void Backend::loadDefaultSetup(MeasurementSetup &setup)
{
    setup.clear();
    int i = 1;

    foreach (CanDriver *driver, _drivers) {
        driver->update();
        foreach (CanInterfaceId intf, driver->getInterfaceIds()) {
            MeasurementNetwork *network = setup.createNetwork();
            network->setName(QString().sprintf("Network %d", i++));

            MeasurementInterface *mi = new MeasurementInterface();
            mi->setCanInterface(intf);
            mi->setBitrate(500000);
            network->addInterface(mi);
        }
    }
}

void Backend::setDefaultSetup()
{
    loadDefaultSetup(_setup);
}

MeasurementSetup &Backend::getSetup()
{
    return _setup;
}

void Backend::setSetup(MeasurementSetup &new_setup)
{
    _setup.cloneFrom(new_setup);
}

double Backend::currentTimeStamp() const
{
    return ((double)QDateTime::currentMSecsSinceEpoch()) / 1000;
}

CanTrace *Backend::getTrace()
{
    return _trace;
}

void Backend::clearTrace()
{
    _trace->clear();
}

CanDbMessage *Backend::findDbMessage(const CanMessage &msg) const
{
    return _setup.findDbMessage(msg);
}

CanInterfaceIdList Backend::getInterfaceList()
{
    CanInterfaceIdList result;
    foreach (CanDriver *driver, _drivers) {
        foreach (CanInterfaceId id, driver->getInterfaceIds()) {
            result.append(id);
        }
    }
    return result;
}

CanDriver *Backend::getDriverById(CanInterfaceId id)
{
    CanDriver *driver = _drivers.value((id>>8) & 0xFF);
    if (!driver) {
        log_critical(QString("Unable to get driver for interface id: %1. This should never happen.").arg(QString().number(id)));
    }
    return driver;
}

CanInterface *Backend::getInterfaceById(CanInterfaceId id)
{
    CanDriver *driver = getDriverById(id);
    return driver ? driver->getInterfaceById(id) : 0;
}

QString Backend::getInterfaceName(CanInterfaceId id)
{
    CanInterface *intf = getInterfaceById(id);
    if (intf) {
        return intf->getName();
    } else {
        log_critical(QString("Trying to get name from unknown interface id: %1. This should never happen.").arg(QString().number(id)));
        return "";
    }
}

QString Backend::getDriverName(CanInterfaceId id)
{
    CanDriver *driver = getDriverById(id);
    return driver ? driver->getName() : "";
}

CanDriver *Backend::getDriverByName(QString driverName)
{
    foreach (CanDriver *driver, _drivers) {
        if (driver->getName()==driverName) {
            return driver;
        }
    }
    return 0;
}

CanInterface *Backend::getInterfaceByDriverAndName(QString driverName, QString deviceName)
{
    CanDriver *driver = getDriverByName(driverName);
    if (driver) {
        return driver->getInterfaceByName(deviceName);
    } else {
        return 0;
    }

}

pCanDb Backend::loadDbc(QString filename)
{
    DbcParser parser;

    QFile *dbc = new QFile(filename);
    pCanDb candb(new CanDb());
    parser.parseFile(dbc, *candb);
    delete dbc;

    return candb;
}

void Backend::clearLog()
{
    _logModel->clear();
}

LogModel &Backend::getLogModel() const
{
    return *_logModel;
}

double Backend::getTimestampAtMeasurementStart() const
{
    return (double)_measurementStartTime / 1000.0;
}

uint64_t Backend::getUsecsAtMeasurementStart() const
{
    return _measurementStartTime * 1000;
}

uint64_t Backend::getNsecsSinceMeasurementStart() const
{
    return _timerSinceStart.nsecsElapsed();
}

uint64_t Backend::getUsecsSinceMeasurementStart() const
{
    return getNsecsSinceMeasurementStart() / 1000;
}

void Backend::logMessage(const QDateTime dt, const log_level_t level, const QString msg)
{
    // QFile logfile("tkr.log");
    // logfile.open(QIODevice::WriteOnly | QIODevice::Append);
    // logfile.write(QString("%1 %2 %3\n").arg(dt.toString("yyyy-MM-dd hh:mm:ss.zzz")).arg(level).arg(msg).toUtf8());
    // logfile.close();

    qDebug() << "logMessage" << dt << level << msg;
    emit onLogMessage(dt, level, msg);
}