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/*! \internal \file
 *  \brief
 *  Data types used internally in the nbnxm_sycl module.
 *
 *  \ingroup module_nbnxm
 */

#ifndef NBNXM_SYCL_TYPES_H
#define NBNXM_SYCL_TYPES_H

#include "gromacs/gpu_utils/devicebuffer.h"
#include "gromacs/gpu_utils/devicebuffer_sycl.h"
#include "gromacs/gpu_utils/gmxsycl.h"
#include "gromacs/gpu_utils/gpueventsynchronizer.h"
#include "gromacs/gpu_utils/gputraits.h"
#include "gromacs/nbnxm/gpu_types_common.h"
#include "gromacs/nbnxm/nbnxm.h"
#include "gromacs/nbnxm/pairlist.h"
#include "gromacs/timing/gpu_timing.h"
#include "gromacs/utility/enumerationhelpers.h"

class GpuEventSynchronizer;

/*! \internal
 * \brief Main data structure for SYCL nonbonded force calculations.
 */
struct NbnxmGpu
{
    /*! \brief GPU device context.
     *
     * \todo Make it constant reference, once NbnxmGpu is a proper class.
     */
    const DeviceContext* deviceContext_;
    /*! \brief true if doing both local/non-local NB work on GPU */
    bool bUseTwoStreams = false;
    /*! \brief true indicates that the nonlocal_done event was marked */
    bool bNonLocalStreamDoneMarked = false;
    /*! \brief atom data */
    NBAtomDataGpu* atdat = nullptr;

    // Data for GPU-side coordinate conversion between integrator and NBNXM
    /*! \brief array of atom indices */
    DeviceBuffer<int> atomIndices;
    /*! \brief size of atom indices */
    int atomIndicesSize = 0;
    /*! \brief size of atom indices allocated in device buffer */
    int atomIndicesSize_alloc = 0;
    /*! \brief x buf ops num of atoms */
    DeviceBuffer<int> cxy_na;
    /*! \brief number of elements in cxy_na */
    int ncxy_na = 0;
    /*! \brief number of elements allocated allocated in device buffer */
    int ncxy_na_alloc = 0;
    /*! \brief x buf ops cell index mapping */
    DeviceBuffer<int> cxy_ind;
    /*! \brief number of elements in cxy_ind */
    int ncxy_ind = 0;
    /*! \brief number of elements allocated allocated in device buffer */
    int ncxy_ind_alloc = 0;

    NBParamGpu* nbparam = nullptr;
    /*! \brief pair-list data structures (local and non-local) */
    gmx::EnumerationArray<Nbnxm::InteractionLocality, Nbnxm::gpu_plist*> plist = { { nullptr } };
    /*! \brief staging area where fshift/energies get downloaded. Will be removed in SYCL. */
    NBStagingData nbst;
    /*! \brief local and non-local GPU streams */
    gmx::EnumerationArray<Nbnxm::InteractionLocality, const DeviceStream*> deviceStreams;

    /*! \brief True if event-based timing is enabled. Always false for SYCL. */
    bool bDoTime = false;
    /*! \brief Dummy timers. */
    Nbnxm::GpuTimers* timers = nullptr;
    /*! \brief Dummy timing data. */
    gmx_wallclock_gpu_nbnxn_t* timings = nullptr;

    //! true when a pair-list transfer has been done at this step
    gmx::EnumerationArray<Nbnxm::InteractionLocality, bool> didPairlistH2D = { { false } };
    //! true when we we did pruning on this step
    gmx::EnumerationArray<Nbnxm::InteractionLocality, bool> didPrune = { { false } };
    //! true when we did rolling pruning (at the previous step)
    gmx::EnumerationArray<Nbnxm::InteractionLocality, bool> didRollingPrune = { { false } };

    /*! \brief Event triggered when the non-local non-bonded
     * kernel is done (and the local transfer can proceed) */
    GpuEventSynchronizer nonlocal_done;
    /*! \brief Event triggered when the tasks issued in the local
     * stream that need to precede the non-local force or buffer
     * operation calculations are done (e.g. f buffer 0-ing, local
     * x/q H2D, buffer op initialization in local stream that is
     * required also by nonlocal stream ) */
    GpuEventSynchronizer misc_ops_and_local_H2D_done;

    /*! \brief True if there is work for the current domain in the
     * respective locality.
     *
     * This includes local/nonlocal GPU work, either bonded or
     * nonbonded, scheduled to be executed in the current
     * domain. As long as bonded work is not split up into
     * local/nonlocal, if there is bonded GPU work, both flags
     * will be true. */
    gmx::EnumerationArray<Nbnxm::InteractionLocality, bool> haveWork = { { false } };
};

#endif /* NBNXM_SYCL_TYPES_H */
