#pragma once

#include "SatelliteData.h"

#include <QDateTime>
#include <QNetworkAccessManager>
#include <QObject>
#include <QVector>
#include <QTimer>

class RinexNavigation : public QObject {
    Q_OBJECT

public:
    explicit RinexNavigation(QObject *parent = nullptr);

    void refresh();
    [[nodiscard]] bool isLoading() const { return m_loading; }

    static QVector<SatellitePosition> parseGpsNavigation(
        const QByteArray &rinex, const QDateTime &whenUtc, QString *error = nullptr);

signals:
    void satellitesUpdated(const QVector<SatellitePosition> &satellites);
    void satelliteMotionUpdated(const QVector<SatellitePosition> &current,
                                const QVector<SatellitePosition> &next,
                                int durationMs);
    void statusChanged(const QString &status, bool error);
    void loadingChanged(bool loading);

private:
    struct Ephemeris {
        QString prn;
        QDateTime toc;
        double crs = 0.0;
        double deltaN = 0.0;
        double m0 = 0.0;
        double cuc = 0.0;
        double eccentricity = 0.0;
        double cus = 0.0;
        double sqrtA = 0.0;
        double toe = 0.0;
        double cic = 0.0;
        double omega0 = 0.0;
        double cis = 0.0;
        double i0 = 0.0;
        double crc = 0.0;
        double omega = 0.0;
        double omegaDot = 0.0;
        double idot = 0.0;
        int gpsWeek = 0;
        bool healthy = true;
    };

    void requestDay(const QDate &date, int fallbackIndex);
    void handleDownload(const QByteArray &compressed, const QDate &date, int fallbackIndex);
    bool loadCache();
    QString cachePath() const;
    void updateCurrentPositions();
    void publishCurrentMotion();
    void setLoading(bool loading);
    static QVector<Ephemeris> parseEphemerides(
        const QByteArray &rinex, QString *error = nullptr);
    static QVector<Ephemeris> selectEphemerides(
        const QVector<Ephemeris> &ephemerides, const QDateTime &whenUtc);
    static QVector<SatellitePosition> propagateEphemerides(
        const QVector<Ephemeris> &ephemerides, const QDateTime &whenUtc);
    static SatellitePosition propagate(const Ephemeris &eph, const QDateTime &whenUtc);

    QNetworkAccessManager m_network;
    QTimer m_positionTimer;
    QVector<Ephemeris> m_ephemerides;
    bool m_loading = false;
};