#pragma once

#include <cstdint>
#include <string>

namespace roro::gnss {

// Great-circle distance in metres (haversine, mean Earth radius).
double distanceMeters(double lat1, double lon1, double lat2, double lon2);

// When a Track takes its next point (Q63): the first one always, then at least every 5 s and only
// after moving at least 5 m, so standing still doesn't fill the card.
class TrackRule {
   public:
    static constexpr uint32_t kEveryMs = 5000;
    static constexpr double kMinMeters = 5.0;

    // True if this position should be recorded (and is then remembered as the last point).
    bool due(uint32_t nowMs, double lat, double lon);
    void reset() { any_ = false; }

   private:
    bool any_ = false;
    uint32_t lastMs_ = 0;
    double lat_ = 0, lon_ = 0;
};

// "/gnss/tracks/YYYYMMDD-HHMMSS.gpx", from the UTC start time (Storage Clean-up reads its date).
std::string trackPath(int64_t utcSeconds);

// GPX 1.1, written a line at a time: the header when a Track starts, a point per line, the footer
// when it stops. A file whose footer never came (power lost) is closed at the next boot.
namespace gpx {
std::string header(const std::string& name);
std::string point(double lat, double lon, bool hasElevation, float elevationM, int64_t utcSeconds);
std::string footer();
bool finished(const std::string& tail);  // the end of a file: does it close the GPX?
}  // namespace gpx

}  // namespace roro::gnss