/****************************************************************************
**
** Copyright (C) 2018 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtLocation module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:GPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 or (at your option) any later version
** approved by the KDE Free Qt Foundation. The licenses are as published by
** the Free Software Foundation and appearing in the file LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qdeclarativenavigator_p.h"
#include "qdeclarativenavigator_p_p.h"
#include <QtLocation/private/qdeclarativegeomap_p.h>
#include <QtLocation/private/qdeclarativegeoserviceprovider_p.h>
#include <QtLocation/private/qnavigationmanager_p.h>
#include <QtLocation/private/qnavigationmanagerengine_p.h>
#include <QtLocation/private/qgeomapparameter_p.h>
#include <QtLocation/private/qdeclarativegeoroute_p.h>
#include <QtLocation/private/qdeclarativegeoroutemodel_p.h>
#include <QtLocation/private/qdeclarativegeoroutesegment_p.h>
#include <QtLocation/qgeoserviceprovider.h>
#include <QtPositioningQuick/private/qdeclarativepositionsource_p.h>
#include <QtQml/qqmlinfo.h>

QT_BEGIN_NAMESPACE

/*!
    \qmltype Navigator
    \instantiates QDeclarativeNavigator
    \inqmlmodule Qt.labs.location
    \ingroup qml-QtLocation5-maps

    \brief The Navigator type offers functionalities to perform turn-by-turn navigation.

    The Navigator purpose is to use a plugin's turn-by-turn navigation implementation in a QML
    application in a seamless manner.
    This object may take control of the map position, orientation, tilting and zoom, as well as changing
    the map style, elements on the map such as direction information.
    In certain cases, it may also restrict user interaction with the Map and with the items on it.
*/

/*!
    \qmlproperty Plugin Qt.labs.location::Navigator::plugin

    This property holds the plugin which provides the navigation functionality.

    This is a write-once property. Once the Navigator has a plugin associated with
    it, any attempted modifications of the plugin property will be ignored.

    \sa Plugin
*/

/*!
    \qmlproperty Map Qt.labs.location::Navigator::map

    This property holds the Map that the navigator is in charge of controlling.

    This is a write-once property. Once the Navigator has a Map associated with
    it, any attempted modifications of the map property will be ignored.

    \sa Map
*/

/*!
    \qmlproperty Route Qt.labs.location::Navigator::route

    This property holds the Route that the navigator is supposed to use
    to perform the navigation.

    \note
    This property is not necessarily the same as \l currentRoute.
    currentRoute may differ, during routing, for various reasons.
    It is reasonable to assume, however, that currentRoute's destination
    will be the same as route's destination.
    Setting this property while a navigation session is ongoing will
    stop the navigation.

    \sa Route
*/

/*!
    \qmlproperty PositionSource Qt.labs.location::Navigator::positionSource

    This property holds the PositionSource that the navigator will receive position
    updates from to perform the navigation.

    This is a write-once property. Once the Navigator has a PositionSource associated with
    it, any attempted modifications of the positionSource property will be ignored.

    \sa PositionSource
*/

/*!
    \qmlproperty bool Qt.labs.location::Navigator::active

    This property tells whether the Navigator is navigating or not.
    Set this property to \c true to start the navigation.
    Set it to \c false to stop an active navigation session.
*/

/*!
    \qmlproperty bool Qt.labs.location::Navigator::navigatorReady

    This read-only property tells whether the navigator is ready
    to start the navigation or not.
    A Navigator becomes ready once the plugin is attached and a navigation engine has been
    instantiated, and the other required properties are set to valid values.
*/

/*!
    \qmlproperty bool Qt.labs.location::Navigator::trackPositionSource

    This property tells whether the Navigator should control the Map camera to
    keep track of position source updates. This property is enabled (\c true) by
    default, and setting it to \c false is useful in cases where e.g. the user
    starts gesturing over the map area.

    Navigator plugins can also control this property directly e.g. user map
    interaction could trigger the property change. Honoring the user-specified
    value of this property is plugin dependent.
*/

/*!
    \qmlproperty enumeration Qt.labs.location::Navigator::error

    This read-only property holds the latest error value of the geocoding request.

    \list
    \li Navigator.NoError - No error has occurred.
    \li GeocodeModel.NotSupportedError - Navigation is not supported by the service provider.
    \li GeocodeModel.ConnectionError - An error occurred while communicating with the service provider.
    \li GeocodeModel.LoaderError - The geoservice provider library could not be loaded. Setting QT_DEBUG_PLUGINS environment variable may help diagnosing the reason.
    \li GeocodeModel.UnknownParameterError - An unknown parameter was specified
    \li GeocodeModel.MissingRequiredParameterError -  required parameter was not specified.
    \li GeocodeModel.UnknownError - An error occurred which does not fit into any of the other categories.

    \endlist
*/

QDeclarativeNavigatorPrivate::QDeclarativeNavigatorPrivate(QParameterizableObject *q_)
    : q(q_), m_params(new QDeclarativeNavigatorParams), m_basicDirections(static_cast<QDeclarativeNavigator *>(q_))
{
}

QDeclarativeNavigator::QDeclarativeNavigator(QObject *parent)
    : QParameterizableObject(parent), d_ptr(new QDeclarativeNavigatorPrivate(this))
{
}

QDeclarativeNavigator::~QDeclarativeNavigator()
{
}

void QDeclarativeNavigator::classBegin()
{
}

void QDeclarativeNavigator::componentComplete()
{
    d_ptr->m_completed = true;
    // Children have been completed
    for (auto param : quickChildren<QGeoMapParameter>())
        d_ptr->m_params->m_parameters.push_back(param);
    if (d_ptr->m_plugin && d_ptr->m_plugin->isAttached())
        pluginReady();
}

QDeclarativeGeoServiceProvider *QDeclarativeNavigator::plugin() const
{
    return d_ptr->m_plugin;
}

void QDeclarativeNavigator::setMap(QDeclarativeGeoMap *map)
{
    if (d_ptr->m_params->m_map || !map) // set once prop
        return;

    d_ptr->m_params->m_map = map;
    connect(map, &QObject::destroyed, this,
            [this]() {
                this->mapChanged();
                this->updateReadyState();
            });
    emit mapChanged();
    updateReadyState();
}

QDeclarativeGeoMap *QDeclarativeNavigator::map() const
{
    return d_ptr->m_params->m_map;
}

void QDeclarativeNavigator::setRoute(QDeclarativeGeoRoute *route)
{
    if (d_ptr->m_params->m_route == route) // This isn't set-once
        return;

    const bool isReady = d_ptr->m_navigator && d_ptr->m_navigator->ready();
    const bool isActive = active();
    if (isReady && isActive)
        setActive(false); // Stop current session

    d_ptr->m_params->m_route = route;
    d_ptr->m_params->m_geoRoute = route ? route->route() : QGeoRoute();
    if (route) {
        connect(route, &QObject::destroyed,
                [this]() {
                    // Do not stop navigation if route disappears. d_ptr->m_geoRoute will still be valid.
                    // Engines can stop navigation if desired.
                    this->routeChanged();
                });
    }
    emit routeChanged();
    updateReadyState();
}

QDeclarativeGeoRoute *QDeclarativeNavigator::route() const
{
    return d_ptr->m_params->m_route;
}

void QDeclarativeNavigator::setPositionSource(QDeclarativePositionSource *positionSource)
{
    if (d_ptr->m_params->m_positionSource || !positionSource) // set once prop
        return;

    d_ptr->m_params->m_positionSource = positionSource;
    QObject::connect(positionSource, &QObject::destroyed,
            [this]() {
                this->positionSourceChanged();
                this->updateReadyState();
            }
    );
    emit positionSourceChanged();
    updateReadyState();
}

QDeclarativePositionSource *QDeclarativeNavigator::positionSource() const
{
    return d_ptr->m_params->m_positionSource;
}


bool QDeclarativeNavigator::navigatorReady() const
{
    if (d_ptr->m_navigator)
        return d_ptr->m_navigator->ready();
    return d_ptr->m_ready;
}

bool QDeclarativeNavigator::trackPositionSource() const
{
    return d_ptr->m_params->m_trackPositionSource;
}

void QDeclarativeNavigator::setTrackPositionSource(bool trackPositionSource)
{
    if (trackPositionSource == d_ptr->m_params->m_trackPositionSource)
        return;

    d_ptr->m_params->m_trackPositionSource = trackPositionSource;

    emit trackPositionSourceChanged(trackPositionSource);
}

QDeclarativeNavigationBasicDirections *QDeclarativeNavigator::directions() const
{
    return &d_ptr->m_basicDirections;
}

QDeclarativeNavigator::NavigationError QDeclarativeNavigator::error() const
{
    return d_ptr->m_error;
}

QString QDeclarativeNavigator::errorString() const
{
    return d_ptr->m_errorString;
}

bool QDeclarativeNavigator::active() const
{
    return d_ptr->m_active;
}

void QDeclarativeNavigator::setPlugin(QDeclarativeGeoServiceProvider *plugin)
{
    if (d_ptr->m_plugin)
        return; // set once property.

    d_ptr->m_plugin = plugin;
    emit pluginChanged();

    if (d_ptr->m_plugin->isAttached()) {
        pluginReady();
    } else {
        connect(d_ptr->m_plugin, &QDeclarativeGeoServiceProvider::attached,
                this, &QDeclarativeNavigator::pluginReady);
    }
}

void QDeclarativeNavigator::setActive(bool active)
{
    if (d_ptr->m_active == active)
        return;

    d_ptr->m_active = active;
    if (!d_ptr->m_plugin)
        return;

    if (active)
        start();
    else
        stop();
}

void QDeclarativeNavigator::start()
{
    if (!d_ptr->m_ready) {
        qmlWarning(this) << QStringLiteral("Navigation manager not ready.");
        return;
    }

    if (!d_ptr->m_navigator->active())
        d_ptr->m_active = d_ptr->m_navigator->start();
}

void QDeclarativeNavigator::stop()
{
    if (!ensureEngine()) { // If somebody re-set route to null or something, this may become !d_ptr->m_ready
        qmlWarning(this) << QStringLiteral("Navigation manager not ready.");
        return;
    }

    if (d_ptr->m_navigator->active())
        d_ptr->m_active = d_ptr->m_navigator->stop();

    // Cached data are cleared in response to signals emitted by m_navigator upon stop().
    // For example, m_navigator emits currentRouteChanged with an empty route,
    // and QDeclarativeNavigationBasicDirections reacts by clearing the declarative route.
}

void QDeclarativeNavigator::pluginReady()
{
    if (!d_ptr->m_completed)
        return;

    ensureEngine();
    updateReadyState();
    if (d_ptr->m_active)
        start();
}

bool QDeclarativeNavigator::ensureEngine()
{
    if (d_ptr->m_navigator)
        return true;
    if (!d_ptr->m_completed || !d_ptr->m_plugin->isAttached())
        return false;

    QGeoServiceProvider *serviceProvider = d_ptr->m_plugin->sharedGeoServiceProvider();
    // if m_plugin->isAttached(), serviceProvider cannot be null
    QNavigationManager *manager = serviceProvider->navigationManager();

    if (serviceProvider->navigationError() != QGeoServiceProvider::NoError) {
        QDeclarativeNavigator::NavigationError newError = UnknownError;
        switch (serviceProvider->navigationError()) {
        case QGeoServiceProvider::NotSupportedError:
            newError = NotSupportedError; break;
        case QGeoServiceProvider::UnknownParameterError:
            newError = UnknownParameterError; break;
        case QGeoServiceProvider::MissingRequiredParameterError:
            newError = MissingRequiredParameterError; break;
        case QGeoServiceProvider::ConnectionError:
            newError = ConnectionError; break;
        case QGeoServiceProvider::LoaderError:
            newError = LoaderError; break;
        default:
            break;
        }

        setError(newError, serviceProvider->navigationErrorString());
        return false;
    }

    if (!manager) {
        setError(NotSupportedError, tr("Plugin does not support navigation."));
        return false;
    }

    d_ptr->m_navigator.reset(manager->createNavigator(d_ptr->m_params));
    if (!d_ptr->m_navigator) {
        setError(UnknownError, tr("Failed to create a navigator object."));
        return false;
    }

    d_ptr->m_navigator->setLocale(manager->locale());
    d_ptr->m_navigator->setMeasurementSystem(manager->measurementSystem());

    connect(d_ptr->m_navigator.get(), &QAbstractNavigator::activeChanged, this, [this](bool active){
        d_ptr->m_active = active;
        emit activeChanged(active);
    });
    connect(this, &QDeclarativeNavigator::trackPositionSourceChanged, d_ptr->m_navigator.get(), &QAbstractNavigator::setTrackPosition);

    // read-only progress info updates
    connect(d_ptr->m_navigator.get(), &QAbstractNavigator::waypointReached,
            &d_ptr->m_basicDirections, &QDeclarativeNavigationBasicDirections::waypointReached);
    connect(d_ptr->m_navigator.get(), &QAbstractNavigator::destinationReached,
            &d_ptr->m_basicDirections, &QDeclarativeNavigationBasicDirections::destinationReached);
    connect(d_ptr->m_navigator.get(), &QAbstractNavigator::currentRouteChanged,
            &d_ptr->m_basicDirections, &QDeclarativeNavigationBasicDirections::onCurrentRouteChanged);
    connect(d_ptr->m_navigator.get(), &QAbstractNavigator::currentRouteLegChanged,
            &d_ptr->m_basicDirections, &QDeclarativeNavigationBasicDirections::onCurrentRouteLegChanged);
    connect(d_ptr->m_navigator.get(), &QAbstractNavigator::currentSegmentChanged,
            &d_ptr->m_basicDirections, &QDeclarativeNavigationBasicDirections::currentSegmentChanged);
    connect(d_ptr->m_navigator.get(), &QAbstractNavigator::nextManeuverIconChanged,
            &d_ptr->m_basicDirections, &QDeclarativeNavigationBasicDirections::nextManeuverIconChanged);
    connect(d_ptr->m_navigator.get(), &QAbstractNavigator::progressInformationChanged,
            &d_ptr->m_basicDirections, &QDeclarativeNavigationBasicDirections::progressInformationChanged);

    emit navigatorReadyChanged(true);
    return true;
}

void QDeclarativeNavigator::updateReadyState() {
    const bool oldReady = d_ptr->m_ready;
    if (!d_ptr->m_navigator)
        d_ptr->m_ready = false;
    else
        d_ptr->m_ready = d_ptr->m_navigator->ready();

    if (oldReady != d_ptr->m_ready)
        emit navigatorReadyChanged(d_ptr->m_ready);
}

void QDeclarativeNavigator::setError(QDeclarativeNavigator::NavigationError error, const QString &errorString)
{
    d_ptr->m_error = error;
    d_ptr->m_errorString = errorString;
    emit errorChanged();
}

QDeclarativeNavigationBasicDirections::QDeclarativeNavigationBasicDirections(QDeclarativeNavigator *parent)
:   QObject(parent), m_navigator(parent)
{
    if (m_navigator)
        m_navigatorPrivate = m_navigator->d_ptr.data();
}

/*!
    \qmlpropertygroup Qt.labs.location::Navigator::directions
    \qmlproperty Variant Qt.labs.location::Navigator::directions.nextManeuverIcon
    \qmlproperty real Qt.labs.location::Navigator::directions.distanceToNextManeuver
    \qmlproperty real Qt.labs.location::Navigator::directions.remainingTravelDistance
    \qmlproperty real Qt.labs.location::Navigator::directions.remainingTravelDistanceToNextWaypoint
    \qmlproperty real Qt.labs.location::Navigator::directions.traveledDistance
    \qmlproperty int Qt.labs.location::Navigator::directions.timeToNextManeuver
    \qmlproperty int Qt.labs.location::Navigator::directions.remainingTravelTime
    \qmlproperty int Qt.labs.location::Navigator::directions.remainingTravelTimeToNextWaypoint
    \qmlproperty int Qt.labs.location::Navigator::directions.traveledTime
    \qmlproperty Route Qt.labs.location::Navigator::directions.currentRoute
    \qmlproperty RouteLeg Qt.labs.location::Navigator::directions.currentRouteLeg
    \qmlproperty int Qt.labs.location::Navigator::directions.currentSegment

    \qmlsignal Qt.labs.location::Navigator::directions.waypointReached(Waypoint waypoint)
    \qmlsignal Qt.labs.location::Navigator::directions.destinationReached()

    These read-only properties are part of the directions property group.
    The directions property group holds the navigation progress information
    that can be used to access the route data and to extract directions.

    \note specific backends might not provide (some of) these information.

    \list
        \li The \l nextManeuverIcon property holds the next turn icon.
        \li The \l distanceToNextManeuver property holds the distance to the next maneuver, in meters.
        \li The \l remainingTravelDistance property holds the remaining travel distance, in meters.
        \li The \l remainingTravelDistanceToNextWaypoint property holds the remaining travel distance to the next waypoint, in meters.
        \li The \l traveledDistance property holds the traveled distance, in meters.
        \li The \l timeToNextManeuver property holds the time to the next maneuver, in milliseconds.
        \li The \l remainingTravelTime property holds the remaining travel time, in milliseconds.
        \li The \l remainingTravelTimeToNextWaypoint property holds the remaining travel time to the next waypoint, in milliseconds.
        \li The \l traveledTime property holds the traveled time, in milliseconds.
        \li The \l currentRoute property olds the current route the navigator is following. This can be the same as \l route, or can be different, if the navigator
        cannot follow the user-specified route. For example if the position coming from \l positionSource is considerably
        off route, the navigation engine might recalculate and start following a
        new route.
        \li The \l currentRouteSegment property holds the current route leg the navigator is following.
        This is always a part of \l currentRoute, and so the property \l RouteLeg::overallRoute
        of currentRouteLeg will hold the same route as \l currentRoute.
        \li The \l currentSegment property holds the index of the current RouteSegment in the \l currentRoute.
        \li The \l waypointReached signal is emitted when the waypoint \e waypoint has been reached.
        \li The \l destinationReached signal is emitted when the last waypoint of the route, the destination,
        has been reached.
    \endlist

    \sa Route, RouteLeg, RouteSegment, Waypoint
*/

QVariant QDeclarativeNavigationBasicDirections::nextManeuverIcon() const
{
    if (m_navigatorPrivate->m_navigator)
        return m_navigatorPrivate->m_navigator->nextManeuverIcon();
    return QVariant();
}

qreal QDeclarativeNavigationBasicDirections::distanceToNextManeuver() const
{
    if (m_navigatorPrivate->m_navigator)
        return m_navigatorPrivate->m_navigator->distanceToNextManeuver();
    return qQNaN();
}

qreal QDeclarativeNavigationBasicDirections::remainingTravelDistance() const
{
    if (m_navigatorPrivate->m_navigator)
        return m_navigatorPrivate->m_navigator->remainingTravelDistance();
    return qQNaN();
}

qreal QDeclarativeNavigationBasicDirections::remainingTravelDistanceToNextWaypoint() const
{
    if (m_navigatorPrivate->m_navigator)
        return m_navigatorPrivate->m_navigator->remainingTravelDistanceToNextWaypoint();
    return qQNaN();
}

qreal QDeclarativeNavigationBasicDirections::traveledDistance() const
{
    if (m_navigatorPrivate->m_navigator)
        return m_navigatorPrivate->m_navigator->traveledDistance();
    return 0;
}

int QDeclarativeNavigationBasicDirections::timeToNextManeuver() const
{
    if (m_navigatorPrivate->m_navigator)
        return m_navigatorPrivate->m_navigator->timeToNextManeuver();
    return -1;
}

int QDeclarativeNavigationBasicDirections::remainingTravelTime() const
{
    if (m_navigatorPrivate->m_navigator)
        return m_navigatorPrivate->m_navigator->remainingTravelTime();
    return -1;
}

int QDeclarativeNavigationBasicDirections::remainingTravelTimeToNextWaypoint() const
{
    if (m_navigatorPrivate->m_navigator)
        return m_navigatorPrivate->m_navigator->remainingTravelTimeToNextWaypoint();
    return -1;
}

int QDeclarativeNavigationBasicDirections::traveledTime() const
{
    if (m_navigatorPrivate->m_navigator)
        return m_navigatorPrivate->m_navigator->traveledTime();
    return 0;
}

QDeclarativeGeoRoute *QDeclarativeNavigationBasicDirections::currentRoute() const
{
    if (!m_navigatorPrivate->m_ready
            || !m_navigatorPrivate->m_navigator
            || !m_navigatorPrivate->m_navigator->active())
        return m_navigatorPrivate->m_params->m_route.data(); // the user-specified route, if any
    return m_currentRoute;
}

QDeclarativeGeoRouteLeg *QDeclarativeNavigationBasicDirections::currentRouteLeg() const
{
    if (!m_navigatorPrivate->m_ready
            || !m_navigatorPrivate->m_navigator
            || !m_navigatorPrivate->m_navigator->active())
        return nullptr;
    return m_currentRouteLeg;
}

int QDeclarativeNavigationBasicDirections::currentSegment() const
{
    if (!m_navigatorPrivate->m_ready
            || !m_navigatorPrivate->m_navigator
            || !m_navigatorPrivate->m_navigator->active())
        return 0;
    return m_navigatorPrivate->m_navigator->currentSegment();
}

void QDeclarativeNavigationBasicDirections::onCurrentRouteChanged()
{
    if (m_currentRoute)
        m_currentRoute->deleteLater();
    m_currentRoute = new QDeclarativeGeoRoute(m_navigatorPrivate->m_navigator->currentRoute(), this);
    emit currentRouteChanged();
}

void QDeclarativeNavigationBasicDirections::onCurrentRouteLegChanged()
{
    if (m_currentRouteLeg)
        m_currentRouteLeg->deleteLater();
    m_currentRouteLeg = new QDeclarativeGeoRouteLeg(m_navigatorPrivate->m_navigator->currentRouteLeg(), this);
    emit currentRouteLegChanged();
}

QT_END_NAMESPACE