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/*! \file
    \brief This file contains definitions and utility functions for describing problem shapes 
           for 3.x Ptr-Array GEMMs and Grouped GEMMs.
*/

#pragma once

#include "hytlass/hytlass.h"
#include "hytlass/tensor_coord.h"

#include "hute/container/array.hpp"

#include <initializer_list>

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

namespace hytlass::gemm {

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

template <class ProblemShape_>
struct GroupProblemShape {
  using UnderlyingProblemShape = ProblemShape_;
  int32_t num_groups = 1;
  UnderlyingProblemShape* problem_shapes = nullptr;
  UnderlyingProblemShape const* host_problem_shapes = nullptr;

  HYTLASS_HOST_DEVICE
  int32_t groups() const { return num_groups; }

  HYTLASS_HOST_DEVICE
  UnderlyingProblemShape const
  get_problem_shape(int32_t group_idx) const {
    return problem_shapes[group_idx];
  }

  HYTLASS_HOST_DEVICE
  UnderlyingProblemShape const
  get_host_problem_shape(int32_t group_idx) const {
    return host_problem_shapes[group_idx];
  }

  HYTLASS_HOST_DEVICE
  bool
  is_host_problem_shape_available() {
    return host_problem_shapes != nullptr;
  }
};

template <class ProblemShape_>
class ArrayProblemShape {
public:
  using UnderlyingProblemShape = ProblemShape_;

  ArrayProblemShape() = default;
  ArrayProblemShape(UnderlyingProblemShape ps) : problem_shape_(ps) {}

  // Num of groups for Ptr-Array GEMM always remain one, just the number of batches (l) can vary
  // This is just to maintain uniformity with GroupProblemShape
  constexpr int32_t groups() const { return 1; }

  UnderlyingProblemShape* problem_shapes() const {
    return &problem_shape_;
  }
  UnderlyingProblemShape const* host_problem_shapes() const {
    return &problem_shape_;
  }

  // This is just to maintain uniformity with GroupProblemShape
  HYTLASS_HOST_DEVICE
  UnderlyingProblemShape const
  get_problem_shape(int32_t /* unused */ = 0) const {
    return problem_shape_;
  }

  HYTLASS_HOST_DEVICE
  UnderlyingProblemShape const
  get_host_problem_shape(int32_t /* unused */ = 0) const {
    return problem_shape_;
  }

  HYTLASS_HOST_DEVICE
  bool
  is_host_problem_shape_available() {
    return true;
  }
private:
  UnderlyingProblemShape problem_shape_{};
};

} // namespace hytlass::gemm 
