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#pragma once

#ifdef __cplusplus
extern "C" {
#endif
#ifndef IN_OPENTRACK
    /* opaque pointers, forward definitions */
    struct opentrack_opaque_ctx;
    typedef opentrack_opaque_ctx* opentrack;
    struct opentrack_opaque_tracker;
    typedef opentrack_opaque_tracker* opentrack_tracker;
#endif

#ifdef IN_OPENTRACK
#   ifdef _WIN32
#       define OPENTRACK_EXPORT __declspec(dllexport)
#   else
#       define OPENTRACK_EXPORT
#   endif
#else
#   ifdef _WIN32
#       define OPENTRACK_EXPORT __declspec(dllimport)
#   else
#       define OPENTRACK_EXPORT
#   endif
#endif

    /* for `opentrack_tracker_tick', individual headpose elts */
#ifndef IN_OPENTRACK
    enum opentrack_dof {
        TX = 0,
        TY,
        TZ,
        Yaw,
        Pitch,
        Roll,
        DOF_count
    };
#endif

    opentrack opentrack_make_ctx(const char* dir);
    void opentrack_finalize_ctx(opentrack self);

    /* no need to free the return value; invalid to modify it */
    const char** opentrack_enum_trackers(opentrack self);

    /*
     * don't `opentrack_tracker_tick an unstarted tracker, it's invalid to do so
     * it's also invalid to start a finalized tracker
     */
    opentrack_tracker opentrack_make_tracker(opentrack ctx, const char* name);
    void opentrack_tracker_start(opentrack self, opentrack_tracker tracker);
    int opentrack_tracker_tick(opentrack_tracker tracker, double* headpose);
    void opentrack_finalize_tracker(opentrack_tracker tracker);
#ifdef __cplusplus
}
#endif