/*
 * Copyright (c) 2022-2023, 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.
 */

#include "src/fastertransformer/utils/gemm_test/swin_gemm_func.h"

namespace fastertransformer {

template<typename T>
void generate_swin_gemm_config(
    int batch_size, int seq_len, int head_num, int size_per_head, void* buffer_in, bool isAppend)
{
    void* cublas_workspace;
    void* buffer;
    int   workSpaceSize;
#ifdef ENABLE_BF16
    if (std::is_same<T, half>::value || std::is_same<T, __nv_bfloat16>::value) {
#else
    if (std::is_same<T, half>::value) {
#endif  // ENABLE_BF16
        // cublas_workspace_ should be the start pointer of cudaMalloc()
        // to ensure 16B alignemnet
        cublas_workspace = buffer_in;
        buffer           = (void*)((char*)cublas_workspace + CUBLAS_WORKSPACE_SIZE);
        workSpaceSize    = CUBLAS_WORKSPACE_SIZE;
    }
    else {
        cublas_workspace = nullptr;
        buffer           = buffer_in;
        workSpaceSize    = 0;
    }

    struct cudaDeviceProp prop;
    check_cuda_error(cudaGetDeviceProperties(&prop, 0));
    printf("Device %s\n", prop.name);

    // check config
    FILE* fd;
    int   line_count = 0;
    if (!isAppend) {
        fd = fopen(GEMM_CONFIG, "w+");
        fprintf(
            fd,
            "batch_size seq_len head_num size_per_head dataType ### batchCount n m k algoId customOption tile splitK_val swizzle reductionScheme workspaceSize stages exec_time\n");
    }
    else {
        fd = fopen(GEMM_CONFIG, "a+");
        std::vector<std::string> config;
        char                     line[1024];
        while (fgets(line, 1024, fd) != NULL) {
            config.push_back(std::string(line));
        }
        line_count = config.size();
        if (config.size() >= (MAX_CONFIG_NUM * GEMM_NUM + 1))  // 6 cublas/cublasLt, first row is not included
        {
            int startIdx = config.size() - ((MAX_CONFIG_NUM - 1) * GEMM_NUM);
            fclose(fd);
            fd = fopen(GEMM_CONFIG, "w+");
            fprintf(fd, "%s", config[0].c_str());
            for (uint i = startIdx; i < config.size(); i++) {
                fprintf(fd, "%s", config[i].c_str());
            }
            line_count = config.size() - (GEMM_NUM + 3);
        }
    }

    const int gemm_num            = 7;
    const int NUM_OF_BASIC_LAYERS = 4;
    int       M[gemm_num];
    int       N[gemm_num];
    int       K[gemm_num];
    int       batchCount[gemm_num] = {1, 1, 1, 1, 1, 1, 1};
    char      mess[gemm_num][256];
    float     exec_times[gemm_num];

    printf("***Encoder Gemm Testing Begin***\n");
    printf("***Cublas Gemm Testing Begin***\n");
    for (int basic_layer = 0; basic_layer < NUM_OF_BASIC_LAYERS; basic_layer++) {
        // gemm1
        M[0] = batch_size * seq_len;
        K[0] = head_num * size_per_head;
        N[0] = 3 * K[0];
        strcpy(mess[0], "from_tensor * weightQ/K/V");

        // gemm2
        M[1] = M[0];
        K[1] = K[0];
        N[1] = K[0];
        strcpy(mess[1], "attr * output_kernel");

        // gemm3
        M[2] = M[0];
        K[2] = K[0];
        N[2] = 4 * K[0];
        strcpy(mess[2], "attr_output * inter_kernel");

        // gemm3
        M[3] = M[0];
        K[3] = 4 * K[0];
        N[3] = K[0];
        strcpy(mess[3], "inter_matmul * output_kernel");

        M[4] = M[0] / 4;
        K[4] = 4 * K[0];
        N[4] = 2 * K[0];
        strcpy(mess[4], "patchMerge gemm");

        M[5]          = seq_len;
        N[5]          = seq_len;
        K[5]          = size_per_head;
        batchCount[5] = batch_size * head_num;
        strcpy(mess[5], "attention batched Gemm1");

        M[6]          = seq_len;
        N[6]          = size_per_head;
        K[6]          = seq_len;
        batchCount[6] = batch_size * head_num;
        strcpy(mess[6], "attention batched Gemm2");

        cublasHandle_t cublas_handle;
        check_cuda_error(cublasCreate(&cublas_handle));
        cublasLtHandle_t ltHandle;
        check_cuda_error(cublasLtCreate(&ltHandle));

        cudaDataType_t AType;
        cudaDataType_t BType;
        cudaDataType_t CType;
        cudaDataType_t computeType;
        int            startAlgo, endAlgo;
        const int      ites = 100;
        struct timeval start, end;

        CublasDataType data_type;
        if (std::is_same<T, float>::value) {
            data_type   = FLOAT_DATATYPE;
            AType       = CUDA_R_32F;
            BType       = CUDA_R_32F;
            CType       = CUDA_R_32F;
            computeType = CUDA_R_32F;
            startAlgo   = (int)CUBLAS_GEMM_DEFAULT;
            // endAlgo     = (int)CUBLAS_GEMM_ALGO23;
            endAlgo     = (int)CUBLAS_GEMM_DEFAULT;
        }
        else if (std::is_same<T, half>::value) {
            data_type   = HALF_DATATYPE;
            AType       = CUDA_R_16F;
            BType       = CUDA_R_16F;
            CType       = CUDA_R_16F;
            computeType = CUDA_R_16F;
            // startAlgo   = (int)CUBLAS_GEMM_DEFAULT_TENSOR_OP;
            // endAlgo     = (int)CUBLAS_GEMM_ALGO15_TENSOR_OP;
            startAlgo   = (int)CUBLAS_GEMM_DEFAULT;
            endAlgo     = (int)CUBLAS_GEMM_DEFAULT;
        }
#ifdef ENABLE_BF16
        else if (std::is_same<T, __nv_bfloat16>::value) {
            data_type   = BFLOAT16_DATATYPE;
            AType       = CUDA_R_16BF;
            BType       = CUDA_R_16BF;
            CType       = CUDA_R_16BF;
            computeType = CUDA_R_32F;
            // startAlgo   = (int)CUBLAS_GEMM_DEFAULT_TENSOR_OP;
            // endAlgo     = (int)CUBLAS_GEMM_ALGO15_TENSOR_OP;
            startAlgo   = (int)CUBLAS_GEMM_DEFAULT;
            endAlgo     = (int)CUBLAS_GEMM_DEFAULT;
        }
#endif
        // using scaleT = typename ScaleTypeConverter<T, false>::Type;
        using scaleT = typename ScaleTypeConverter<T, true>::Type;

        scaleT alpha = (scaleT)1.0f;
        scaleT beta  = (scaleT)0.0f;

        for (int i = 0; i < gemm_num; ++i) {
            // if(i != 0 && i != 5) continue;

            int m = M[i], n = N[i], k = K[i];
            printf("\n-----------------------------\n");
            printf("GEMM test %d: [M: %d, K: %d, N: %d] %s\n", i, m, k, n, mess[i]);
            T* d_A = (T*)buffer;
            T* d_B = d_A + m * k * batchCount[i];
            T* d_C = d_B + k * n * batchCount[i];

            // array of pointer for batchedGemm
            T* harray[12];
            harray[0]  = (T*)buffer;
            harray[1]  = (T*)((char*)buffer + sizeof(T) * m * k);
            harray[2]  = (T*)((char*)buffer + 2 * sizeof(T) * m * k);
            harray[4]  = (T*)((char*)buffer + 3 * sizeof(T) * m * k);
            harray[5]  = (T*)((char*)buffer + 3 * sizeof(T) * m * k + sizeof(T) * k * n);
            harray[6]  = (T*)((char*)buffer + 3 * sizeof(T) * m * k + 2 * sizeof(T) * k * n);
            harray[8]  = (T*)((char*)buffer + 3 * sizeof(T) * m * k + 3 * sizeof(T) * k * n);
            harray[9]  = (T*)((char*)buffer + 3 * sizeof(T) * m * k + 3 * sizeof(T) * k * n + sizeof(T) * m * n);
            harray[10] = (T*)((char*)buffer + 3 * sizeof(T) * m * k + 3 * sizeof(T) * k * n + 2 * sizeof(T) * m * n);

            T** darray = 0;
            check_cuda_error(cudaMalloc((void**)&darray, sizeof(T*) * 12));
            cudaMemcpy((void*)darray, (void*)harray, sizeof(T*) * 12, cudaMemcpyHostToDevice);
            T** dAarray = darray;
            T** dBarray = darray + 4;
            T** dCarray = darray + 8;

            float exec_time = 99999.0f;
            int   fast_algo = 0;
            for (int algo = startAlgo; algo <= endAlgo; algo++) {
                cublasStatus_t status;
                cudaDeviceSynchronize();
                gettimeofday(&start, NULL);
                for (int ite = 0; ite < ites; ++ite) {
                    if (i < 5) {
                        status = cublasGemmEx(cublas_handle,
                                              CUBLAS_OP_N,
                                              CUBLAS_OP_N,
                                              n,
                                              m,
                                              k,
                                              &alpha,
                                              d_B,
                                              BType,
                                              n,
                                              d_A,
                                              AType,
                                              k,
                                              &beta,
                                              d_C,
                                              CType,
                                              n,
                                              computeType,
                                              static_cast<cublasGemmAlgo_t>(algo));
                    }
                    else if (i == 5) {
                        status = cublasGemmStridedBatchedEx(cublas_handle,
                                                            CUBLAS_OP_T,
                                                            CUBLAS_OP_N,
                                                            seq_len,
                                                            seq_len,
                                                            size_per_head,
                                                            &alpha,
                                                            d_B,
                                                            BType,
                                                            size_per_head,
                                                            seq_len * size_per_head,
                                                            d_A,
                                                            AType,
                                                            size_per_head,
                                                            seq_len * size_per_head,
                                                            &beta,
                                                            d_C,
                                                            CType,
                                                            seq_len,
                                                            seq_len * seq_len,
                                                            batch_size * head_num,
                                                            computeType,
                                                            static_cast<cublasGemmAlgo_t>(algo));
                    }
                    else if (i == 6) {
                        status = cublasGemmStridedBatchedEx(cublas_handle,
                                                            CUBLAS_OP_N,
                                                            CUBLAS_OP_N,
                                                            size_per_head,
                                                            seq_len,
                                                            seq_len,
                                                            &alpha,
                                                            d_B,
                                                            BType,
                                                            size_per_head,
                                                            seq_len * size_per_head,
                                                            d_A,
                                                            AType,
                                                            seq_len,
                                                            seq_len * seq_len,
                                                            &beta,
                                                            d_C,
                                                            CType,
                                                            size_per_head,
                                                            seq_len * size_per_head,
                                                            batch_size * head_num,
                                                            computeType,
                                                            static_cast<cublasGemmAlgo_t>(algo));
                    }
                    if (status != CUBLAS_STATUS_SUCCESS) {
                        break;
                    }
                }
                cudaDeviceSynchronize();
                gettimeofday(&end, NULL);
                if (status == CUBLAS_STATUS_SUCCESS) {
                    printf("algo_%d costs %.3fms \n", algo, diffTime(start, end) / ites);
                    if (diffTime(start, end) / ites < exec_time) {
                        exec_time = diffTime(start, end) / ites;
                        fast_algo = algo;
                    }
                }
            }
            printf("fast_algo %d costs %.3f ms\n", fast_algo, exec_time);

            // for fp16 and bf16, we compare cublasLt
            if (i < 5 && data_type != FLOAT_DATATYPE) {
                printf("***cublasLt Gemm Testing Begin***\n");
                // Let try a fixed number of combinations
                int                ALGO_COMBINATIONS = 5000;
                customMatmulPerf_t perfResults[ALGO_COMBINATIONS];

                // LtHgemmCustomFind<T, scaleT>(ltHandle,
                //                              batch_size,
                //                              seq_len,
                //                              head_num,
                //                              size_per_head,
                //                              n,
                //                              m,
                //                              k,
                //                              &alpha,
                //                              d_B,
                //                              d_A,
                //                              &beta,
                //                              d_C,
                //                              cublas_workspace,
                //                              workSpaceSize,
                //                              fd,
                //                              perfResults,
                //                              ALGO_COMBINATIONS);
                // if (perfResults[0].time < exec_time) {
                //     printPerfStructure(
                //         batch_size, seq_len, head_num, size_per_head, n, m, k, perfResults[0], fd, data_type, 0);
                //     exec_time = perfResults[0].time;
                // }
                // else {
                //     fprintf(fd,
                //             "%d %d %d %d %d ### %d %d %d %d %d -1 -1 -1 -1 -1 -1 -1 "
                {
                    fprintf(fd,
                            "%d %d %d %d %d ### %d %d %d %d %d -1 -1 -1 -1 -1 -1 -1 "
#if (CUBLAS_VER_MAJOR == 11 && CUBLAS_VER_MINOR == 11 && CUBLAS_VER_PATCH >= 3)
                            "-1 -1 "
#elif (CUBLAS_VER_MAJOR == 11 && CUBLAS_VER_MINOR == 11 && CUBLAS_VER_PATCH < 3)
                            "-1 -1 -1 "
#endif
                            "%f\n",
                            batch_size,
                            seq_len,
                            head_num,
                            size_per_head,
                            data_type,
                            batchCount[i],
                            n,
                            m,
                            k,
                            fast_algo,
                            exec_time);
                }
                printf("***cublasLt Gemm Testing End***\n");
            }
            else {
                fprintf(fd,
                        "%d %d %d %d %d ### %d %d %d %d %d -1 -1 -1 -1 -1 -1 -1 "
#if (CUBLAS_VER_MAJOR == 11 && CUBLAS_VER_MINOR == 11 && CUBLAS_VER_PATCH >= 3)
                        "-1 -1 "
#elif (CUBLAS_VER_MAJOR == 11 && CUBLAS_VER_MINOR == 11 && CUBLAS_VER_PATCH < 3)
                        "-1 -1 -1 "
#endif
                        "%f\n",
                        batch_size,
                        seq_len,
                        head_num,
                        size_per_head,
                        data_type,
                        batchCount[i],
                        n,
                        m,
                        k,
                        fast_algo,
                        exec_time);
            }
            exec_times[i] = exec_time;
            cudaFree(darray);
        }

        if (basic_layer != NUM_OF_BASIC_LAYERS - 1) {
            batch_size = batch_size / 4;
            head_num   = head_num * 2;
        }
    }
    printf("***cublas Gemm Testing End***\n\n");
    fclose(fd);
    printf("***Encoder Gemm Testing End***\n");
    return;
}

template void generate_swin_gemm_config<float>(
    int batch_size, int seq_len, int head_num, int size_per_head, void* buffer, bool isAppend);
template void generate_swin_gemm_config<half>(
    int batch_size, int seq_len, int head_num, int size_per_head, void* buffer, bool isAppend);
#ifdef ENABLE_BF16
template void generate_swin_gemm_config<__nv_bfloat16>(
    int batch_size, int seq_len, int head_num, int size_per_head, void* buffer, bool isAppend);
#endif

}  // namespace fastertransformer
