/****************************************************************************
 *
 *   (c) 2009-2016 QGROUNDCONTROL PROJECT <http://www.qgroundcontrol.org>
 *
 * QGroundControl is licensed according to the terms in the file
 * COPYING.md in the root of the source code directory.
 *
 ****************************************************************************/

#include "FactPanelController.h"
#include "MultiVehicleManager.h"
#include "UAS.h"
#include "QGCApplication.h"
#include "ParameterManager.h"

#include <QQmlEngine>

/// @file
///     @author Don Gagne <don@thegagnes.com>

QGC_LOGGING_CATEGORY(FactPanelControllerLog, "FactPanelControllerLog")

FactPanelController::FactPanelController(bool standaloneUnitTesting)
    : _vehicle(NULL)
    , _uas(NULL)
    , _autopilot(NULL)
    , _factPanel(NULL)
{
    _vehicle = qgcApp()->toolbox()->multiVehicleManager()->activeVehicle();

    if (_vehicle) {
        _uas = _vehicle->uas();
        _autopilot = _vehicle->autopilotPlugin();
    } else {
        _vehicle = qgcApp()->toolbox()->multiVehicleManager()->offlineEditingVehicle();
    }

    if (!standaloneUnitTesting) {
        // Do a delayed check for the _factPanel finally being set correctly from Qml
        QTimer::singleShot(1000, this, &FactPanelController::_checkForMissingFactPanel);
    }
}

QQuickItem* FactPanelController::factPanel(void)
{
    return _factPanel;
}

void FactPanelController::setFactPanel(QQuickItem* panel)
{
    // Once we finally have the _factPanel member set, send any
    // missing fact notices that were waiting to go out

    _factPanel = panel;
    foreach (const QString &missingParam, _delayedMissingParams) {
        _notifyPanelMissingParameter(missingParam);
    }
    _delayedMissingParams.clear();
}

void FactPanelController::_notifyPanelMissingParameter(const QString& missingParam)
{
    if (_factPanel) {
        QVariant returnedValue;

        QMetaObject::invokeMethod(_factPanel,
                                  "showMissingParameterOverlay",
                                  Q_RETURN_ARG(QVariant, returnedValue),
                                  Q_ARG(QVariant, missingParam));
    }
}

void FactPanelController::_notifyPanelErrorMsg(const QString& errorMsg)
{
    if (_factPanel) {
        QVariant returnedValue;

        QMetaObject::invokeMethod(_factPanel,
                                  "showError",
                                  Q_RETURN_ARG(QVariant, returnedValue),
                                  Q_ARG(QVariant, errorMsg));
    }
}

void FactPanelController::_reportMissingParameter(int componentId, const QString& name)
{
    qgcApp()->reportMissingParameter(componentId, name);

    QString missingParam = QString("%1:%2").arg(componentId).arg(name);

    // If missing parameters a reported from the constructor of a derived class we
    // will not have access to _factPanel yet. Just record list of missing facts
    // in that case instead of notify. Once _factPanel is available they will be
    // send out for real.
    if (_factPanel) {
        _notifyPanelMissingParameter(missingParam);
    } else {
        _delayedMissingParams += missingParam;
    }
}

bool FactPanelController::_allParametersExists(int componentId, QStringList names)
{
    bool noMissingFacts = true;

    foreach (const QString &name, names) {
        if (_vehicle && !_vehicle->parameterManager()->parameterExists(componentId, name)) {
            _reportMissingParameter(componentId, name);
            noMissingFacts = false;
        }
    }

    return noMissingFacts;
}

void FactPanelController::_checkForMissingFactPanel(void)
{
    if (!_factPanel) {
        _showInternalError("Incorrect FactPanel Qml implementation. FactPanelController used without passing in factPanel.");
    }
}

Fact* FactPanelController::getParameterFact(int componentId, const QString& name, bool reportMissing)
{
    if (_vehicle && _vehicle->parameterManager()->parameterExists(componentId, name)) {
        Fact* fact = _vehicle->parameterManager()->getParameter(componentId, name);
        QQmlEngine::setObjectOwnership(fact, QQmlEngine::CppOwnership);
        return fact;
    } else {
        if(reportMissing)
            _reportMissingParameter(componentId, name);
        return NULL;
    }
}

bool FactPanelController::parameterExists(int componentId, const QString& name)
{
    return _vehicle ? _vehicle->parameterManager()->parameterExists(componentId, name) : false;
}

void FactPanelController::_showInternalError(const QString& errorMsg)
{
    _notifyPanelErrorMsg(QString("Internal Error: %1").arg(errorMsg));
    qCWarning(FactPanelControllerLog) << "Internal Error" << errorMsg;
    qgcApp()->showMessage(errorMsg);
}