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/* \file
   \brief
*/

#include "cutlass/profiler/device_context.h"

namespace cutlass {
namespace profiler {

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

/// Allocates memory of a given type, capacity (elements), and name
DeviceAllocation *DeviceContext::allocate_block(
  Options const &options,
  std::string const &name,
  library::NumericTypeID type,
  size_t capacity,
  size_t device_index) {

  int device = options.device.device_id(device_index);
  device_memory_.emplace_back(type, capacity, device);
  DeviceAllocation *allocation = &device_memory_.back();

  allocations_[name] = allocation;
  return allocation;
}

/// Allocates memory of a given type, capacity (elements), and name
DeviceAllocation *DeviceContext::allocate_tensor(
  Options const &options,
  std::string const &name,
  library::NumericTypeID type,
  library::LayoutTypeID layout_id,
  std::vector<int> const &extent,
  std::vector<int64_t> const &stride,
  int batch_count,
  size_t device_index) {

  int device = options.device.device_id(device_index);
  device_memory_.emplace_back(type, layout_id, extent, stride, batch_count,
                              device);
  DeviceAllocation *allocation = &device_memory_.back();

  allocations_[name] = allocation;
  return allocation;
}

static void initialize_allocation_with_data_distribution(
  Options const &options,
  int seed_shift,
  DeviceAllocation *allocation,
  Distribution &data_distribution) {
  if (options.initialization.provider == library::Provider::kReferenceDevice) {
    if (data_distribution.kind == Distribution::Sequential) {
      allocation->initialize_sequential_device(
        data_distribution);
    }
    else {
      allocation->initialize_random_device(
        options.initialization.seed + seed_shift,
        data_distribution);
    }
  }
  else if (options.initialization.provider == library::Provider::kReferenceHost) {
    if (data_distribution.kind == Distribution::Sequential) {
      allocation->initialize_sequential_host(
        data_distribution);
    }
    else {
      allocation->initialize_random_host(
        options.initialization.seed + seed_shift,
        data_distribution);
    }
  }
}

/// Allocates memory of a given type, capacity (elements), and name
DeviceAllocation *DeviceContext::allocate_and_initialize_tensor(
  Options const &options,
  std::string const &name,
  library::NumericTypeID type,
  library::LayoutTypeID layout_id,
  std::vector<int> const &extent,
  std::vector<int64_t> const &stride,
  int batch_count,
  int seed_shift,
  size_t device_index) {

  DeviceAllocation *allocation =
      allocate_tensor(options, name, type, layout_id, extent, stride,
                      batch_count, device_index);

  if (options.initialization.enabled) {
    Distribution data_distribution = options.initialization.data_distribution;

    // check if data distribution is allowed to change
    if(!options.initialization.fix_data_distribution) {
      // change data distribution based on bit width
      switch(type) {
        case library::NumericTypeID::kFE4M3:
          data_distribution.set_uniform(-1, 1, 0);
          break;
        case library::NumericTypeID::kFE5M2:
          data_distribution.set_uniform(-1, 1, 0);
          break;
        
        case library::NumericTypeID::kFE2M3:
          data_distribution.set_uniform(-2, 2, 0);
          break;
        case library::NumericTypeID::kFE3M2:
          data_distribution.set_uniform(-2, 2, 0);
          break;
        case library::NumericTypeID::kFE2M1:
          data_distribution.set_uniform(-2, 2, 0);
          break;
        case library::NumericTypeID::kFUE8M0:
          data_distribution.set_uniform(1, 4, 0);
          break;
        
        case library::NumericTypeID::kFUE4M3:
          data_distribution.set_uniform(1, 4, 0);
          break;
        
        case library::NumericTypeID::kF16:
          data_distribution.set_uniform(-3, 3, 0);
          break;
        case library::NumericTypeID::kB1:
          data_distribution.set_uniform(0, 1, 0);
          break;
        case library::NumericTypeID::kS2:
          data_distribution.set_uniform(-1, 1, 0);
          break;
        case library::NumericTypeID::kS4:
          data_distribution.set_uniform(-2, 2, 0);
          break;
        case library::NumericTypeID::kU2:
          data_distribution.set_uniform(0, 2, 0);
          break;
        case library::NumericTypeID::kU4:
          data_distribution.set_uniform(0, 2, 0);
          break;
        case library::NumericTypeID::kS8:
          data_distribution.set_uniform(-3, 3, 0);
          break;
        case library::NumericTypeID::kU8:
          data_distribution.set_uniform(0, 4, 0);
          break;
        default: break;
      }
    }

    // Override pnz for the A/B/C tensors if overridden for Gaussian distributions
    if (data_distribution.kind == Distribution::Gaussian) {
      double mean = data_distribution.gaussian.mean;
      double stddev = data_distribution.gaussian.stddev;
      int scale = data_distribution.int_scale;

      if (name == "A" && data_distribution.gaussian.pnzA != 1.0) {
        data_distribution.set_gaussian(mean, stddev, scale, data_distribution.gaussian.pnzA);
      }
      else if (name == "B" && data_distribution.gaussian.pnzB != 1.0) {
        data_distribution.set_gaussian(mean, stddev, scale, data_distribution.gaussian.pnzB);
      }
      else if (name == "C" && data_distribution.gaussian.pnzC != 1.0) {
        data_distribution.set_gaussian(mean, stddev, scale, data_distribution.gaussian.pnzC);
      }
    }

    initialize_allocation_with_data_distribution(
      options, seed_shift, allocation, data_distribution
    );
  }

  return allocation;
}

/// Allocates memory for sparse meta data
DeviceAllocation *DeviceContext::allocate_and_initialize_sparsemeta_tensor(
  Options const &options,
  std::string const &name,
  library::NumericTypeID type,
  library::LayoutTypeID layout_id,
  library::NumericTypeID type_a,
  std::vector<int> const &extent,
  std::vector<int64_t> const &stride,
  int batch_count,
  int seed_shift,
  size_t device_index) {

  DeviceAllocation *allocation =
      allocate_tensor(options, name, type, layout_id, extent, stride,
                      batch_count, device_index);

  if (options.initialization.enabled) {
    // TF32 has 4bit meta data.  The rest has 2bit.
    int MetaSizeInBits = (cutlass::library::sizeof_bits(type_a) == 32) ? 4 : 2;

    if (options.initialization.provider == library::Provider::kReferenceDevice) {
      allocation->initialize_random_sparsemeta_device(
        options.initialization.seed + seed_shift,
        MetaSizeInBits);
    }
    else if (options.initialization.provider == library::Provider::kReferenceHost) {
      allocation->initialize_random_sparsemeta_host(
        options.initialization.seed + seed_shift,
        MetaSizeInBits);
    }
  }

  return allocation;
}
/// Clears named allocations (but does not necessarily free memory)
void DeviceContext::clear() {
  allocations_.clear();
}

/// Frees all device memory allocations
void DeviceContext::free() {
  allocations_.clear();
  device_memory_.clear();
}

/// Gets the allocation by name
DeviceAllocation &DeviceContext::at(std::string const &name) {
  return *allocations_.at(name);
}

size_t DeviceContext::size() const {
  return allocations_.size();
}

DeviceContext::AllocationMap::iterator DeviceContext::begin() {
  return allocations_.begin();
}

DeviceContext::AllocationMap::iterator DeviceContext::end() {
  return allocations_.end();
}

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

} // namespace profiler
} // namespace cutlass