#include <torch/csrc/jit/codegen/cuda/interface.h>
#include <ATen/core/dispatch/OperatorOptions.h>
#include <torch/csrc/jit/runtime/custom_operator.h>

namespace torch {
namespace jit {
namespace fuser {
namespace cuda {

CudaFuserInterface* getFuserInterface() {
  static CudaFuserInterface fuser_interface_;
  return &fuser_interface_;
}

void compileFusionGroup(Node* fusion_node) {
  TORCH_CHECK(
      getFuserInterface()->fn_compile_n_ != nullptr,
      "Running the CUDA fuser requires a CUDA build.");
  getFuserInterface()->fn_compile_n_(fusion_node);
}

void runFusionGroup(const Node* fusion_node, Stack& stack) {
  TORCH_CHECK(
      getFuserInterface()->fn_run_n_s_ != nullptr,
      "Running the CUDA fuser requires a CUDA build.");
  getFuserInterface()->fn_run_n_s_(fusion_node, stack);
}

void fuseGraph(std::shared_ptr<Graph>& graph) {
  TORCH_CHECK(
      getFuserInterface()->fn_fuse_graph != nullptr,
      "Running the CUDA fuser requires a CUDA build.");
  getFuserInterface()->fn_fuse_graph(graph);
}

} // namespace cuda
} // namespace fuser

RegisterOperators reg({
    Operator(
        prim::CudaFusionGroup,
        [](const Node* node) -> Operation {
          return [node](Stack& stack) {
            fuser::cuda::runFusionGroup(node, stack);
            return 0;
          };
        },
        c10::AliasAnalysisKind::INTERNAL_SPECIAL_CASE),
});

} // namespace jit
} // namespace torch