/*
 * Copyright (c) 2021, NVIDIA CORPORATION.  All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#pragma once

#include "src/fastertransformer/models/multi_gpu_gpt/ParallelGpt.h"
#include "src/fastertransformer/triton_backend/multi_gpu_gpt/ParallelGptTritonModel.h"
#include "src/fastertransformer/triton_backend/transformer_triton_backend.hpp"
#include <memory>

namespace ft = fastertransformer;

template<typename T>
struct ParallelGptTritonModelInstance: AbstractTransformerModelInstance {

    ParallelGptTritonModelInstance(std::unique_ptr<ft::ParallelGpt<T>>                     gpt,
                                   std::shared_ptr<ft::ParallelGptWeight<T>>               gpt_weight,
                                   std::unique_ptr<ft::Allocator<ft::AllocatorType::CUDA>> allocator,
                                   std::unique_ptr<ft::cublasAlgoMap>                      cublas_algo_map,
                                   std::unique_ptr<std::mutex>                             cublas_wrapper_mutex,
                                   std::unique_ptr<ft::cublasMMWrapper>                    cublas_wrapper,
                                   std::unique_ptr<cudaDeviceProp>                         cuda_device_prop_ptr);
    ~ParallelGptTritonModelInstance();

    std::shared_ptr<std::vector<triton::Tensor>>
    forward(std::shared_ptr<std::vector<triton::Tensor>> input_tensors) override;

    std::shared_ptr<std::unordered_map<std::string, triton::Tensor>>
    forward(std::shared_ptr<std::unordered_map<std::string, triton::Tensor>> input_tensors) override;

    static std::shared_ptr<std::unordered_map<std::string, triton::Tensor>>
    convert_outputs(const std::unordered_map<std::string, ft::Tensor>& output_tensors);

private:
    const std::unique_ptr<ft::ParallelGpt<T>>                     gpt_;
    const std::shared_ptr<ft::ParallelGptWeight<T>>               gpt_weight_;
    const std::unique_ptr<ft::Allocator<ft::AllocatorType::CUDA>> allocator_;
    const std::unique_ptr<ft::cublasAlgoMap>                      cublas_algo_map_;
    const std::unique_ptr<std::mutex>                             cublas_wrapper_mutex_;
    const std::unique_ptr<ft::cublasMMWrapper>                    cublas_wrapper_;
    const std::unique_ptr<cudaDeviceProp>                         cuda_device_prop_ptr_;

    std::unordered_map<std::string, ft::Tensor>
    convert_inputs(std::shared_ptr<std::unordered_map<std::string, triton::Tensor>> input_tensors);

    void allocateBuffer(const size_t request_batch_size,
                        const size_t beam_width,
                        const size_t total_output_len,
                        const size_t request_output_len);
    void freeBuffer();

    int*   d_input_ids_                = nullptr;
    int*   d_input_lengths_            = nullptr;
    int*   d_request_prompt_lengths_   = nullptr;
    int*   d_input_bad_words_          = nullptr;
    int*   d_input_stop_words_         = nullptr;
    T*     d_request_prompt_embedding_ = nullptr;
    float* d_top_p_decay_              = nullptr;
    float* d_top_p_min_                = nullptr;
    int*   d_top_p_reset_ids_          = nullptr;

    int*   d_output_ids_             = nullptr;
    int*   d_sequence_lengths_       = nullptr;
    int*   d_response_input_lengths_ = nullptr;
    float* d_output_log_probs_       = nullptr;
    float* d_cum_log_probs_          = nullptr;
    float* d_output_ctx_emb_         = nullptr;
    bool*  d_is_finished_            = nullptr;

    uint32_t*          h_total_output_lengths_ = nullptr;
    std::exception_ptr h_exception_            = nullptr;
};
