/* ************************************************************************
 * Copyright (C) 2016-2022 Advanced Micro Devices, Inc. All rights reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell cop-
 * ies of the Software, and to permit persons to whom the Software is furnished
 * to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IM-
 * PLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNE-
 * CTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 * ************************************************************************ */

#pragma once

#include "cblas_interface.hpp"
#include "flops.hpp"
#include "norm.hpp"
#include "rocblas.hpp"
#include "rocblas_datatype2string.hpp"
#include "rocblas_init.hpp"
#include "rocblas_math.hpp"
#include "rocblas_random.hpp"
#include "rocblas_test.hpp"
#include "rocblas_vector.hpp"
#include "unit.hpp"
#include "utility.hpp"

template <typename T>
void testing_trsv_batched_bad_arg(const Arguments& arg)
{
    auto rocblas_trsv_batched_fn
        = arg.fortran ? rocblas_trsv_batched<T, true> : rocblas_trsv_batched<T, false>;

    const rocblas_int       M           = 100;
    const rocblas_int       lda         = 100;
    const rocblas_int       incx        = 1;
    const rocblas_int       batch_count = 1;
    const rocblas_operation transA      = rocblas_operation_none;
    const rocblas_fill      uplo        = rocblas_fill_lower;
    const rocblas_diagonal  diag        = rocblas_diagonal_non_unit;

    rocblas_local_handle handle{arg};

    // Naming: `h` is in CPU (host) memory(eg hA), `d` is in GPU (device) memory (eg dA).
    // Allocate host memory
    host_batch_matrix<T> hA(M, M, lda, batch_count);
    host_batch_vector<T> hx(M, incx, batch_count);

    // Check host memory allocation
    CHECK_HIP_ERROR(hA.memcheck());
    CHECK_HIP_ERROR(hx.memcheck());

    // Allocate device memory
    device_batch_matrix<T> dA(M, M, lda, batch_count);
    device_batch_vector<T> dx(M, incx, batch_count);

    // Check device memory allocation
    CHECK_DEVICE_ALLOCATION(dA.memcheck());
    CHECK_DEVICE_ALLOCATION(dx.memcheck());

    // Checks.
    EXPECT_ROCBLAS_STATUS(rocblas_trsv_batched_fn(handle,
                                                  rocblas_fill_full,
                                                  transA,
                                                  diag,
                                                  M,
                                                  dA.ptr_on_device(),
                                                  lda,
                                                  dx.ptr_on_device(),
                                                  incx,
                                                  batch_count),
                          rocblas_status_invalid_value);
    // arg_checks code shared so transA, diag tested only in non-batched

    EXPECT_ROCBLAS_STATUS(
        rocblas_trsv_batched_fn(
            handle, uplo, transA, diag, M, nullptr, lda, dx.ptr_on_device(), incx, batch_count),
        rocblas_status_invalid_pointer);

    EXPECT_ROCBLAS_STATUS(
        rocblas_trsv_batched_fn(
            handle, uplo, transA, diag, M, dA.ptr_on_device(), lda, nullptr, incx, batch_count),
        rocblas_status_invalid_pointer);

    EXPECT_ROCBLAS_STATUS(rocblas_trsv_batched_fn(nullptr,
                                                  uplo,
                                                  transA,
                                                  diag,
                                                  M,
                                                  dA.ptr_on_device(),
                                                  lda,
                                                  dx.ptr_on_device(),
                                                  incx,
                                                  batch_count),
                          rocblas_status_invalid_handle);
}

#define ERROR_EPS_MULTIPLIER 40
#define RESIDUAL_EPS_MULTIPLIER 40

template <typename T>
void testing_trsv_batched(const Arguments& arg)
{
    auto rocblas_trsv_batched_fn
        = arg.fortran ? rocblas_trsv_batched<T, true> : rocblas_trsv_batched<T, false>;

    rocblas_int M           = arg.M;
    rocblas_int lda         = arg.lda;
    rocblas_int incx        = arg.incx;
    char        char_uplo   = arg.uplo;
    char        char_transA = arg.transA;
    char        char_diag   = arg.diag;
    rocblas_int batch_count = arg.batch_count;

    rocblas_fill      uplo   = char2rocblas_fill(char_uplo);
    rocblas_operation transA = char2rocblas_operation(char_transA);
    rocblas_diagonal  diag   = char2rocblas_diagonal(char_diag);

    rocblas_status       status;
    rocblas_local_handle handle{arg};

    // check here to prevent undefined memory allocation error
    bool invalid_size = M < 0 || lda < M || lda < 1 || !incx || batch_count < 0;
    if(invalid_size || !M || !batch_count)
    {
        CHECK_ROCBLAS_ERROR(rocblas_set_pointer_mode(handle, rocblas_pointer_mode_host));
        EXPECT_ROCBLAS_STATUS(
            rocblas_trsv_batched_fn(
                handle, uplo, transA, diag, M, nullptr, lda, nullptr, incx, batch_count),
            invalid_size ? rocblas_status_invalid_size : rocblas_status_success);
        return;
    }

    size_t abs_incx = size_t(incx >= 0 ? incx : -incx);

    // Naming: `h` is in CPU (host) memory(eg hA), `d` is in GPU (device) memory (eg dA).
    // Allocate host memory
    host_batch_matrix<T> hA(M, M, lda, batch_count);
    host_batch_matrix<T> hAAT(M, M, lda, batch_count);
    host_batch_vector<T> hb(M, incx, batch_count);
    host_batch_vector<T> hx(M, incx, batch_count);
    host_batch_vector<T> hx_or_b_1(M, incx, batch_count);
    host_batch_vector<T> hx_or_b_2(M, incx, batch_count);
    host_batch_vector<T> cpu_x_or_b(M, incx, batch_count);

    // Check host memory allocation
    CHECK_HIP_ERROR(hA.memcheck());
    CHECK_HIP_ERROR(hAAT.memcheck());
    CHECK_HIP_ERROR(hb.memcheck());
    CHECK_HIP_ERROR(hx.memcheck());
    CHECK_HIP_ERROR(hx_or_b_1.memcheck());
    CHECK_HIP_ERROR(hx_or_b_2.memcheck());
    CHECK_HIP_ERROR(cpu_x_or_b.memcheck());

    // Allocate device memory
    device_batch_matrix<T> dA(M, M, lda, batch_count);
    device_batch_vector<T> dx_or_b(M, incx, batch_count);

    // Check device memory allocation
    CHECK_DEVICE_ALLOCATION(dA.memcheck());
    CHECK_DEVICE_ALLOCATION(dx_or_b.memcheck());

    // Initialize data on host memory
    rocblas_init_matrix(
        hA, arg, rocblas_client_never_set_nan, rocblas_client_triangular_matrix, true);
    rocblas_init_vector(hx, arg, rocblas_client_never_set_nan, false, true);

    for(int b = 0; b < batch_count; b++)
    {
        //  calculate hAAT = hA * hA ^ T or hAAT = hA * hA ^ H if complex
        cblas_gemm<T>(rocblas_operation_none,
                      rocblas_operation_conjugate_transpose,
                      M,
                      M,
                      M,
                      T(1.0),
                      hA[b],
                      lda,
                      hA[b],
                      lda,
                      T(0.0),
                      hAAT[b],
                      lda);

        //  copy hAAT into hA, make hA strictly diagonal dominant, and therefore SPD
        copy_hAAT_to_hA<T>((T*)hAAT[b], (T*)hA[b], M, size_t(lda));

        //  calculate Cholesky factorization of SPD (or Hermitian if complex) matrix hA
        cblas_potrf<T>(char_uplo, M, hA[b], lda);

        //  make hA unit diagonal if diag == rocblas_diagonal_unit
        if(diag == rocblas_diagonal_unit)
        {
            make_unit_diagonal(uplo, (T*)hA[b], lda, M);
        }
    }
    hb.copy_from(hx);

    for(int b = 0; b < batch_count; b++)
    {
        // Calculate hb = hA*hx;
        cblas_trmv<T>(uplo, transA, diag, M, hA[b], lda, hb[b], incx);
    }

    cpu_x_or_b.copy_from(hb);
    hx_or_b_1.copy_from(hb);
    hx_or_b_2.copy_from(hb);

    // copy data from CPU to device
    CHECK_HIP_ERROR(dx_or_b.transfer_from(hx_or_b_1));
    CHECK_HIP_ERROR(dA.transfer_from(hA));

    double error_host       = 0.0;
    double error_device     = 0.0;
    double max_error_host   = 0.0;
    double max_error_device = 0.0;
    double gpu_time_used, cpu_time_used;
    double error_eps_multiplier    = ERROR_EPS_MULTIPLIER;
    double residual_eps_multiplier = RESIDUAL_EPS_MULTIPLIER;
    double eps                     = std::numeric_limits<real_t<T>>::epsilon();
    if(!ROCBLAS_REALLOC_ON_DEMAND)
    {
        // Compute size
        CHECK_ROCBLAS_ERROR(rocblas_start_device_memory_size_query(handle));

        CHECK_ALLOC_QUERY(rocblas_trsv_batched_fn(handle,
                                                  uplo,
                                                  transA,
                                                  diag,
                                                  M,
                                                  dA.ptr_on_device(),
                                                  lda,
                                                  dx_or_b.ptr_on_device(),
                                                  incx,
                                                  batch_count));

        size_t size;
        CHECK_ROCBLAS_ERROR(rocblas_stop_device_memory_size_query(handle, &size));

        // Allocate memory
        CHECK_ROCBLAS_ERROR(rocblas_set_device_memory_size(handle, size));
    }

    if(arg.unit_check || arg.norm_check)
    {
        // calculate dxorb <- A^(-1) b   rocblas_device_pointer_host
        CHECK_ROCBLAS_ERROR(rocblas_set_pointer_mode(handle, rocblas_pointer_mode_host));

        handle.pre_test(arg);
        CHECK_ROCBLAS_ERROR(rocblas_trsv_batched_fn(handle,
                                                    uplo,
                                                    transA,
                                                    diag,
                                                    M,
                                                    dA.ptr_on_device(),
                                                    lda,
                                                    dx_or_b.ptr_on_device(),
                                                    incx,
                                                    batch_count));
        handle.post_test(arg);

        CHECK_HIP_ERROR(hx_or_b_1.transfer_from(dx_or_b));

        // calculate dxorb <- A^(-1) b   rocblas_device_pointer_device
        CHECK_ROCBLAS_ERROR(rocblas_set_pointer_mode(handle, rocblas_pointer_mode_device));

        CHECK_HIP_ERROR(dx_or_b.transfer_from(hx_or_b_2));

        handle.pre_test(arg);
        CHECK_ROCBLAS_ERROR(rocblas_trsv_batched_fn(handle,
                                                    uplo,
                                                    transA,
                                                    diag,
                                                    M,
                                                    dA.ptr_on_device(),
                                                    lda,
                                                    dx_or_b.ptr_on_device(),
                                                    incx,
                                                    batch_count));
        handle.post_test(arg);

        CHECK_HIP_ERROR(hx_or_b_2.transfer_from(dx_or_b));

        //computed result is in hx_or_b, so forward error is E = hx - hx_or_b
        // calculate norm 1 of vector E
        for(int b = 0; b < batch_count; b++)
        {
            error_host       = rocblas_abs(vector_norm_1<T>(M, abs_incx, hx[b], hx_or_b_1[b]));
            error_device     = rocblas_abs(vector_norm_1<T>(M, abs_incx, hx[b], hx_or_b_2[b]));
            max_error_host   = std::max(max_error_host, error_host);
            max_error_device = std::max(max_error_device, error_device);

            //unit test
            trsm_err_res_check<T>(error_host, M, error_eps_multiplier, eps);
            trsm_err_res_check<T>(error_device, M, error_eps_multiplier, eps);
        }

        // hx_or_b contains A * (calculated X), so res = A * (calculated x) - b = hx_or_b - hb
        for(int b = 0; b < batch_count; b++)
        {
            cblas_trmv<T>(uplo, transA, diag, M, hA[b], lda, hx_or_b_1[b], incx);
            cblas_trmv<T>(uplo, transA, diag, M, hA[b], lda, hx_or_b_2[b], incx);
        }

        //calculate norm 1 of res
        for(int b = 0; b < batch_count; b++)
        {
            error_host   = rocblas_abs(vector_norm_1<T>(M, abs_incx, hx_or_b_1[b], hb[b]));
            error_device = rocblas_abs(vector_norm_1<T>(M, abs_incx, hx_or_b_1[b], hb[b]));
            //unit test
            trsm_err_res_check<T>(error_host, M, residual_eps_multiplier, eps);
            trsm_err_res_check<T>(error_device, M, residual_eps_multiplier, eps);
        }
    }

    if(arg.timing)
    {
        // GPU rocBLAS
        CHECK_HIP_ERROR(dx_or_b.transfer_from(hx_or_b_1));

        CHECK_ROCBLAS_ERROR(rocblas_set_pointer_mode(handle, rocblas_pointer_mode_host));

        int number_cold_calls = arg.cold_iters;
        int number_hot_calls  = arg.iters;

        for(int i = 0; i < number_cold_calls; i++)
            rocblas_trsv_batched_fn(handle,
                                    uplo,
                                    transA,
                                    diag,
                                    M,
                                    dA.ptr_on_device(),
                                    lda,
                                    dx_or_b.ptr_on_device(),
                                    incx,
                                    batch_count);

        hipStream_t stream;
        CHECK_ROCBLAS_ERROR(rocblas_get_stream(handle, &stream));
        gpu_time_used = get_time_us_sync(stream); // in microseconds

        for(int i = 0; i < number_hot_calls; i++)
            rocblas_trsv_batched_fn(handle,
                                    uplo,
                                    transA,
                                    diag,
                                    M,
                                    dA.ptr_on_device(),
                                    lda,
                                    dx_or_b.ptr_on_device(),
                                    incx,
                                    batch_count);

        gpu_time_used = get_time_us_sync(stream) - gpu_time_used;

        // CPU cblas
        cpu_time_used = get_time_us_no_sync();

        if(arg.norm_check)
            for(int b = 0; b < batch_count; b++)
                cblas_trsv<T>(uplo, transA, diag, M, hA[b], lda, cpu_x_or_b[b], incx);

        cpu_time_used = get_time_us_no_sync() - cpu_time_used;

        ArgumentModel<e_uplo, e_transA, e_diag, e_M, e_lda, e_incx, e_batch_count>{}.log_args<T>(
            rocblas_cout,
            arg,
            gpu_time_used,
            trsv_gflop_count<T>(M),
            ArgumentLogging::NA_value,
            cpu_time_used,
            max_error_host,
            max_error_device);
    }
}
