/****************************************************************************
 *
 * (c) 2009-2020 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.
 *
 ****************************************************************************/

#pragma once

#include "ComplexMissionItem.h"
#include "MissionItem.h"
#include "Fact.h"
#include "QGCLoggingCategory.h"

Q_DECLARE_LOGGING_CATEGORY(VTOLLandingComplexItemLog)

class VTOLLandingPatternTest;
class PlanMasterController;

class VTOLLandingComplexItem : public ComplexMissionItem
{
    Q_OBJECT

public:
    VTOLLandingComplexItem(PlanMasterController* masterController, bool flyView, QObject* parent);

    Q_PROPERTY(Fact*            loiterAltitude          READ    loiterAltitude                                              CONSTANT)
    Q_PROPERTY(Fact*            loiterRadius            READ    loiterRadius                                                CONSTANT)
    Q_PROPERTY(Fact*            landingAltitude         READ    landingAltitude                                             CONSTANT)
    Q_PROPERTY(Fact*            landingHeading          READ    landingHeading                                              CONSTANT)
    Q_PROPERTY(Fact*            landingDistance         READ    landingDistance                                             CONSTANT)
    Q_PROPERTY(bool             loiterClockwise         MEMBER  _loiterClockwise                                            NOTIFY loiterClockwiseChanged)
    Q_PROPERTY(bool             altitudesAreRelative    MEMBER  _altitudesAreRelative                                       NOTIFY altitudesAreRelativeChanged)
    Q_PROPERTY(Fact*            stopTakingPhotos        READ    stopTakingPhotos                                            CONSTANT)
    Q_PROPERTY(Fact*            stopTakingVideo         READ    stopTakingVideo                                             CONSTANT)
    Q_PROPERTY(QGeoCoordinate   loiterCoordinate        READ    loiterCoordinate            WRITE setLoiterCoordinate       NOTIFY loiterCoordinateChanged)
    Q_PROPERTY(QGeoCoordinate   loiterTangentCoordinate READ    loiterTangentCoordinate                                     NOTIFY loiterTangentCoordinateChanged)
    Q_PROPERTY(QGeoCoordinate   landingCoordinate       READ    landingCoordinate           WRITE setLandingCoordinate      NOTIFY landingCoordinateChanged)
    Q_PROPERTY(bool             landingCoordSet         MEMBER _landingCoordSet                                             NOTIFY landingCoordSetChanged)

    Fact*           loiterAltitude          (void) { return &_loiterAltitudeFact; }
    Fact*           loiterRadius            (void) { return &_loiterRadiusFact; }
    Fact*           landingAltitude         (void) { return &_landingAltitudeFact; }
    Fact*           landingDistance         (void) { return &_landingDistanceFact; }
    Fact*           landingHeading          (void) { return &_landingHeadingFact; }
    Fact*           stopTakingPhotos        (void) { return &_stopTakingPhotosFact; }
    Fact*           stopTakingVideo         (void) { return &_stopTakingVideoFact; }
    QGeoCoordinate  landingCoordinate       (void) const { return _landingCoordinate; }
    QGeoCoordinate  loiterCoordinate        (void) const { return _loiterCoordinate; }
    QGeoCoordinate  loiterTangentCoordinate (void) const { return _loiterTangentCoordinate; }

    void setLandingCoordinate       (const QGeoCoordinate& coordinate);
    void setLoiterCoordinate        (const QGeoCoordinate& coordinate);

    /// Scans the loaded items for a landing pattern complex item
    static bool scanForItem(QmlObjectListModel* visualItems, bool flyView, PlanMasterController* masterController);

    static MissionItem* createDoLandStartItem   (int seqNum, QObject* parent);
    static MissionItem* createLoiterToAltItem   (int seqNum, bool altRel, double loiterRaidus, double lat, double lon, double alt, QObject* parent);
    static MissionItem* createLandItem          (int seqNum, bool altRel, double lat, double lon, double alt, QObject* parent);

    // Overrides from ComplexMissionItem
    QString patternName         (void) const final { return name; }
    double  complexDistance     (void) const final;
    int     lastSequenceNumber  (void) const final;
    bool    load                (const QJsonObject& complexObject, int sequenceNumber, QString& errorString) final;
    double  greatestDistanceTo  (const QGeoCoordinate &other) const final;
    QString mapVisualQML        (void) const final { return QStringLiteral("VTOLLandingPatternMapVisual.qml"); }

    // Overrides from VisualMissionItem
    bool                dirty                       (void) const final { return _dirty; }
    bool                isSimpleItem                (void) const final { return false; }
    bool                isStandaloneCoordinate      (void) const final { return false; }
    bool                specifiesCoordinate         (void) const final;
    bool                specifiesAltitudeOnly       (void) const final { return false; }
    QString             commandDescription          (void) const final { return "Landing Pattern"; }
    QString             commandName                 (void) const final { return "Landing Pattern"; }
    QString             abbreviation                (void) const final { return "L"; }
    QGeoCoordinate      coordinate                  (void) const final { return _loiterCoordinate; }
    QGeoCoordinate      exitCoordinate              (void) const final { return _landingCoordinate; }
    int                 sequenceNumber              (void) const final { return _sequenceNumber; }
    double              specifiedFlightSpeed        (void) final { return std::numeric_limits<double>::quiet_NaN(); }
    double              specifiedGimbalYaw          (void) final { return std::numeric_limits<double>::quiet_NaN(); }
    double              specifiedGimbalPitch        (void) final { return std::numeric_limits<double>::quiet_NaN(); }
    void                appendMissionItems          (QList<MissionItem*>& items, QObject* missionItemParent) final;
    void                applyNewAltitude            (double newAltitude) final;
    double              additionalTimeDelay         (void) const final { return 0; }
    ReadyForSaveState   readyForSaveState           (void) const final;
    bool                exitCoordinateSameAsEntry   (void) const final { return false; }
    void                setDirty                    (bool dirty) final;
    void                setCoordinate               (const QGeoCoordinate& coordinate) final { setLoiterCoordinate(coordinate); }
    void                setSequenceNumber           (int sequenceNumber) final;
    void                save                        (QJsonArray&  missionItems) final;
    double              amslEntryAlt                (void) const final;
    double              amslExitAlt                 (void) const final;
    double              minAMSLAltitude             (void) const final { return amslExitAlt(); }
    double              maxAMSLAltitude             (void) const final { return amslEntryAlt(); }

    static const QString name;

    static const char* jsonComplexItemTypeValue;

    static const char* settingsGroup;
    static const char* loiterToLandDistanceName;
    static const char* loiterAltitudeName;
    static const char* loiterRadiusName;
    static const char* landingHeadingName;
    static const char* landingAltitudeName;
    static const char* stopTakingPhotosName;
    static const char* stopTakingVideoName;

signals:
    void loiterCoordinateChanged        (QGeoCoordinate coordinate);
    void loiterTangentCoordinateChanged (QGeoCoordinate coordinate);
    void landingCoordinateChanged       (QGeoCoordinate coordinate);
    void landingCoordSetChanged         (bool landingCoordSet);
    void loiterClockwiseChanged         (bool loiterClockwise);
    void altitudesAreRelativeChanged    (bool altitudesAreRelative);
    void _updateFlightPathSegmentsSignal(void);

private slots:
    void    _recalcFromHeadingAndDistanceChange         (void);
    void    _recalcFromCoordinateChange                 (void);
    void    _recalcFromRadiusChange                     (void);
    void    _updateLoiterCoodinateAltitudeFromFact      (void);
    void    _updateLandingCoodinateAltitudeFromFact     (void);
    double  _mathematicAngleToHeading                   (double angle);
    double  _headingToMathematicAngle                   (double heading);
    void    _setDirty                                   (void);
    void    _signalLastSequenceNumberChanged            (void);
    void    _updateFlightPathSegmentsDontCallDirectly   (void);

private:
    QPointF _rotatePoint                    (const QPointF& point, const QPointF& origin, double angle);

    int             _sequenceNumber =               0;
    bool            _dirty  =                       false;
    QGeoCoordinate  _loiterCoordinate;
    QGeoCoordinate  _loiterTangentCoordinate;
    QGeoCoordinate  _landingCoordinate;
    bool            _landingCoordSet =              false;
    bool            _ignoreRecalcSignals =          false;
    bool            _loiterClockwise =              true;
    bool            _altitudesAreRelative =         true;

    QMap<QString, FactMetaData*> _metaDataMap;

    Fact            _landingDistanceFact;
    Fact            _loiterAltitudeFact;
    Fact            _loiterRadiusFact;
    Fact            _landingHeadingFact;
    Fact            _landingAltitudeFact;
    Fact            _stopTakingPhotosFact;
    Fact            _stopTakingVideoFact;


    static const char* _jsonLoiterCoordinateKey;
    static const char* _jsonLoiterRadiusKey;
    static const char* _jsonLoiterClockwiseKey;
    static const char* _jsonLandingCoordinateKey;
    static const char* _jsonAltitudesAreRelativeKey;
    static const char* _jsonStopTakingPhotosKey;
    static const char* _jsonStopTakingVideoKey;

    friend VTOLLandingPatternTest;
};
