#include <ATen/ThreadLocalState.h>
#include <torch/csrc/distributed/c10d/ProcessGroup.hpp>

#include <c10/util/Logging.h>
#include <fmt/format.h>

namespace c10d {

std::string opTypeToString(OpType opType) {
  switch (opType) {
    case OpType::BROADCAST:
      return "BROADCAST";
    case OpType::ALLREDUCE:
      return "ALLREDUCE";
    case OpType::ALLREDUCE_COALESCED:
      return "ALLREDUCE_COALESCED";
    case OpType::REDUCE:
      return "REDUCE";
    case OpType::ALLGATHER:
      return "ALLGATHER";
    case OpType::_ALLGATHER_BASE:
      return "_ALLGATHER_BASE";
    case OpType::ALLGATHER_COALESCED:
      return "ALLGATHER_COALESCED";
    case OpType::GATHER:
      return "GATHER";
    case OpType::SCATTER:
      return "SCATTER";
    case OpType::REDUCE_SCATTER:
      return "REDUCE_SCATTER";
    case OpType::ALLTOALL_BASE:
      return "ALLTOALL_BASE";
    case OpType::ALLTOALL:
      return "ALLTOALL";
    case OpType::SEND:
      return "SEND";
    case OpType::RECV:
      return "RECV";
    case OpType::RECVANYSOURCE:
      return "RECVANYSOURCE";
    case OpType::BARRIER:
      return "BARRIER";
    case OpType::UNKNOWN:
      return "UNKNOWN";
    case OpType::_REDUCE_SCATTER_BASE:
      return "_REDUCE_SCATTER_BASE";
    default:
      TORCH_INTERNAL_ASSERT(false, "Unknown op type!");
  }
  return "UNKNOWN";
}

bool isP2POp(OpType opType, bool batchP2P /*= false*/) {
  if (batchP2P)
    return false;
  return opType == OpType::SEND || opType == OpType::RECV ||
      opType == OpType::RECVANYSOURCE;
}

ProcessGroup::ProcessGroup(int rank, int size)
    : rank_(rank), size_(size), dist_debug_level_(debug_level()) {
  C10_LOG_API_USAGE_ONCE("c10d.process_group");
}

ProcessGroup::~ProcessGroup() {}

void ProcessGroup::init() {
  C10_LOG_API_USAGE_ONCE(
      fmt::format("c10d.process_group_{}", getBackendName()));
}
} // namespace c10d