// SPDX-License-Identifier: Apache-2.0
// SPDX-FileCopyrightText: 2019-2022 Second State INC

#pragma once

#include "plugin/plugin.h"
#include "types.h"

#ifdef WASMEDGE_PLUGIN_WASI_NN_BACKEND_TORCH
#include <torch/script.h>
#include <vector>
#endif

namespace WasmEdge::Host::WASINN {
struct WasiNNEnvironment;
}

namespace WasmEdge::Host::WASINN::PyTorch {

#ifdef WASMEDGE_PLUGIN_WASI_NN_BACKEND_TORCH
struct Graph {
  torch::jit::Module TorchModel;
  torch::DeviceType TorchDevice = at::kCPU;
};

struct Context {
public:
  Context(size_t GId, Graph &) noexcept : GraphId(GId) {}
  size_t GraphId;
  std::vector<torch::jit::IValue> TorchInputs;
  std::vector<at::Tensor> TorchOutputs;
};
#else
struct Graph {};
struct Context {
  Context(size_t, Graph &) noexcept {}
};
#endif

struct Environ {};

Expect<WASINN::ErrNo> load(WASINN::WasiNNEnvironment &Env,
                           Span<const Span<uint8_t>> Builders,
                           WASINN::Device Device, uint32_t &GraphId) noexcept;
Expect<WASINN::ErrNo> initExecCtx(WASINN::WasiNNEnvironment &Env,
                                  uint32_t GraphId,
                                  uint32_t &ContextId) noexcept;
Expect<WASINN::ErrNo> setInput(WASINN::WasiNNEnvironment &Env,
                               uint32_t ContextId, uint32_t Index,
                               const TensorData &Tensor) noexcept;
Expect<WASINN::ErrNo> getOutput(WASINN::WasiNNEnvironment &Env,
                                uint32_t ContextId, uint32_t Index,
                                Span<uint8_t> OutBuffer,
                                uint32_t &BytesWritten) noexcept;
Expect<WASINN::ErrNo> compute(WASINN::WasiNNEnvironment &Env,
                              uint32_t ContextId) noexcept;
} // namespace WasmEdge::Host::WASINN::PyTorch
