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#pragma once

/*! \file
    \brief Utilities for selecting default tile schedulers
*/

#include "hytlass/detail/dependent_false.hpp"
#include "hytlass/gemm/kernel/gfx928_tile_scheduler.hpp"
#include "hytlass/gemm/kernel/gfx928_tile_scheduler_stream_k.hpp"
#include "hytlass/gemm/kernel/gfx928_tile_scheduler_group.hpp"
////////////////////////////////////////////////////////////////////////////////

namespace hytlass::gemm {

////////////////////////////////////////////////////////////////////////////////

//
// Tags for specifying tile schedulers
//

struct PersistentScheduler { };

struct StreamKScheduler { };

struct GroupScheduler { }; // Only used for Grouped GEMMs
struct RegularScheduler{ };

////////////////////////////////////////////////////////////////////////////////

} // namespace hytlass::gemm

////////////////////////////////////////////////////////////////////////////////

namespace hytlass::gemm::kernel::detail {

//
// Selectors mapping tile scheduler tag and arch tag to a tile scheduler class
//

template <
  class TileSchedulerTag,
  class ArchTag,
  class TileShape,
  class ClusterShape, 
  class ProblemShapeType = void
>
struct TileSchedulerSelector {
  static_assert(hytlass::detail::dependent_false<ArchTag>,
      "Could not select a tile scheduler for given parameters.");
};

template <
  class TileShape,
  class ArchTag
>
struct TileSchedulerSelector<
  RegularScheduler,
  ArchTag,
  TileShape,
  hute::Shape<hute::_1, hute::_1, hute::_1>
  > {
  using Scheduler = RegularTileScheduler;
};

template <
  class TileShape,
  class ArchTag
>
struct TileSchedulerSelector <
  void,
  ArchTag,
  TileShape,
  hute::Shape<hute::_1, hute::_1, hute::_1>
  > {
  using Scheduler = typename TileSchedulerSelector<
    RegularScheduler,
    ArchTag,
    TileShape,
    hute::Shape<hute::_1, hute::_1, hute::_1>
  >::Scheduler;
};

template <
  class ArchTag,
  class TileShape,
  class ClusterShape
>
struct TileSchedulerSelector<
  PersistentScheduler,
  ArchTag,
  TileShape,
  ClusterShape
  > {
  using Scheduler = PersistentTileScheduler;
};

template <
  class TileShape,
  class ArchTag,
  class ClusterShape, 
  class GroupProblemShape
>
struct TileSchedulerSelector<
  GroupScheduler,
  ArchTag,
  TileShape,
  ClusterShape, 
  GroupProblemShape
  > {
  using Scheduler = PersistentTileSchedulerGfx928Group<GroupProblemShape>;
};

template <
  class TileShape,
  class ArchTag,
  class ClusterShape
>
struct TileSchedulerSelector<
  StreamKScheduler,
  ArchTag,         
  TileShape,
  ClusterShape
  > {
  using Scheduler = PersistentTileSchedulerStreamK<TileShape, ClusterShape>;
};

////////////////////////////////////////////////////////////////////////////////

} // namespace hytlass::gemm::kernel::detail

////////////////////////////////////////////////////////////////////////////////
