/* ************************************************************************
 * Copyright (C) 2016-2024 Advanced Micro Devices, Inc. All rights reserved.
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 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
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 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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#include <fstream>
#include <iostream>
#include <stdlib.h>
#include <vector>

#include "testing_common.hpp"

using hipblasGelsModel = ArgumentModel<e_a_type, e_transA, e_M, e_N, e_lda, e_ldb>;

inline void testname_gels(const Arguments& arg, std::string& name)
{
    hipblasGelsModel{}.test_name(arg, name);
}

template <typename T>
void testing_gels_bad_arg(const Arguments& arg)
{
    auto hipblasGelsFn
        = arg.api == hipblas_client_api::FORTRAN ? hipblasGels<T, true> : hipblasGels<T, false>;

    hipblasLocalHandle       handle(arg);
    const int                M     = 100;
    const int                N     = 101;
    const int                nrhs  = 10;
    const int                lda   = 102;
    const int                ldb   = 103;
    const hipblasOperation_t opN   = HIPBLAS_OP_N;
    const hipblasOperation_t opBad = is_complex<T> ? HIPBLAS_OP_T : HIPBLAS_OP_C;

    // Allocate device memory
    device_matrix<T> dA(M, N, lda);
    device_matrix<T> dB(M, nrhs, ldb);

    device_vector<int> dInfo(1);
    int                info = 0;
    int                expectedInfo;

    EXPECT_HIPBLAS_STATUS(hipblasGelsFn(handle, opN, M, N, nrhs, dA, lda, dB, ldb, nullptr, dInfo),
                          HIPBLAS_STATUS_INVALID_VALUE);

    EXPECT_HIPBLAS_STATUS(hipblasGelsFn(handle, opBad, M, N, nrhs, dA, lda, dB, ldb, &info, dInfo),
                          HIPBLAS_STATUS_INVALID_VALUE);
    expectedInfo = -1;
    unit_check_general(1, 1, 1, &expectedInfo, &info);

    EXPECT_HIPBLAS_STATUS(hipblasGelsFn(handle, opN, -1, N, nrhs, dA, lda, dB, ldb, &info, dInfo),
                          HIPBLAS_STATUS_INVALID_VALUE);
    expectedInfo = -2;
    unit_check_general(1, 1, 1, &expectedInfo, &info);

    EXPECT_HIPBLAS_STATUS(hipblasGelsFn(handle, opN, M, -1, nrhs, dA, lda, dB, ldb, &info, dInfo),
                          HIPBLAS_STATUS_INVALID_VALUE);
    expectedInfo = -3;
    unit_check_general(1, 1, 1, &expectedInfo, &info);

    EXPECT_HIPBLAS_STATUS(hipblasGelsFn(handle, opN, M, N, -1, dA, lda, dB, ldb, &info, dInfo),
                          HIPBLAS_STATUS_INVALID_VALUE);
    expectedInfo = -4;
    unit_check_general(1, 1, 1, &expectedInfo, &info);

    EXPECT_HIPBLAS_STATUS(
        hipblasGelsFn(handle, opN, M, N, nrhs, nullptr, lda, dB, ldb, &info, dInfo),
        HIPBLAS_STATUS_INVALID_VALUE);
    expectedInfo = -5;
    unit_check_general(1, 1, 1, &expectedInfo, &info);

    EXPECT_HIPBLAS_STATUS(hipblasGelsFn(handle, opN, M, N, nrhs, dA, M - 1, dB, ldb, &info, dInfo),
                          HIPBLAS_STATUS_INVALID_VALUE);
    expectedInfo = -6;
    unit_check_general(1, 1, 1, &expectedInfo, &info);

    EXPECT_HIPBLAS_STATUS(
        hipblasGelsFn(handle, opN, M, N, nrhs, dA, lda, nullptr, ldb, &info, dInfo),
        HIPBLAS_STATUS_INVALID_VALUE);
    expectedInfo = -7;
    unit_check_general(1, 1, 1, &expectedInfo, &info);

    // Explicit values to check for ldb < M and ldb < N
    EXPECT_HIPBLAS_STATUS(
        hipblasGelsFn(handle, opN, 100, 200, nrhs, dA, lda, dB, 199, &info, dInfo),
        HIPBLAS_STATUS_INVALID_VALUE);
    expectedInfo = -8;
    unit_check_general(1, 1, 1, &expectedInfo, &info);

    EXPECT_HIPBLAS_STATUS(
        hipblasGelsFn(handle, opN, 200, 100, nrhs, dA, 201, dB, 199, &info, dInfo),
        HIPBLAS_STATUS_INVALID_VALUE);
    expectedInfo = -8;
    unit_check_general(1, 1, 1, &expectedInfo, &info);

    EXPECT_HIPBLAS_STATUS(hipblasGelsFn(handle, opN, M, N, nrhs, dA, lda, dB, ldb, &info, nullptr),
                          HIPBLAS_STATUS_INVALID_VALUE);
    expectedInfo = -10;
    unit_check_general(1, 1, 1, &expectedInfo, &info);

    // If M == 0 || N == 0, A can be nullptr
    EXPECT_HIPBLAS_STATUS(
        hipblasGelsFn(handle, opN, 0, N, nrhs, nullptr, lda, dB, ldb, &info, dInfo),
        HIPBLAS_STATUS_SUCCESS);
    expectedInfo = 0;
    unit_check_general(1, 1, 1, &expectedInfo, &info);

    EXPECT_HIPBLAS_STATUS(
        hipblasGelsFn(handle, opN, M, 0, nrhs, nullptr, lda, dB, ldb, &info, dInfo),
        HIPBLAS_STATUS_SUCCESS);
    expectedInfo = 0;
    unit_check_general(1, 1, 1, &expectedInfo, &info);

    // If nrhs == 0, B can be nullptr
    EXPECT_HIPBLAS_STATUS(hipblasGelsFn(handle, opN, M, N, 0, dA, lda, nullptr, ldb, &info, dInfo),
                          HIPBLAS_STATUS_SUCCESS);
    expectedInfo = 0;
    unit_check_general(1, 1, 1, &expectedInfo, &info);

    // If M == 0 && N == 0, B can be nullptr
    EXPECT_HIPBLAS_STATUS(
        hipblasGelsFn(handle, opN, 0, 0, nrhs, nullptr, lda, nullptr, ldb, &info, dInfo),
        HIPBLAS_STATUS_SUCCESS);
    expectedInfo = 0;
    unit_check_general(1, 1, 1, &expectedInfo, &info);
}

template <typename T>
void testing_gels(const Arguments& arg)
{
    using U            = real_t<T>;
    bool FORTRAN       = arg.api == hipblas_client_api::FORTRAN;
    auto hipblasGelsFn = FORTRAN ? hipblasGels<T, true> : hipblasGels<T, false>;

    char transc = arg.transA;
    int  N      = arg.N;
    int  M      = arg.M;
    int  nrhs   = arg.K;
    int  lda    = arg.lda;
    int  ldb    = arg.ldb;

    if(is_complex<T> && transc == 'T')
        transc = 'C';
    else if(!is_complex<T> && transc == 'C')
        transc = 'T';

    hipblasOperation_t trans = char2hipblas_operation(transc);

    // Check to prevent memory allocation error
    if(M < 0 || N < 0 || nrhs < 0 || lda < M || ldb < M || ldb < N)
    {
        return;
    }

    // Naming: `h` is in CPU (host) memory(eg hA), `d` is in GPU (device) memory (eg dA).
    // Allocate host memory
    host_matrix<T> hA(M, N, lda);
    host_matrix<T> hB(M, nrhs, ldb);
    host_matrix<T> hB_res(M, nrhs, ldb);
    int            info, info_res;
    int            info_input(-1);

    // Allocate device memory
    device_matrix<T>   dA(M, N, lda);
    device_matrix<T>   dB(M, nrhs, ldb);
    device_vector<int> dInfo(1);

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

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

    double             gpu_time_used, hipblas_error;
    hipblasLocalHandle handle(arg);

    // Initial hA, hB, hX on CPU
    hipblas_init_matrix(hA, arg, hipblas_client_never_set_nan, hipblas_general_matrix, true);
    hipblas_init_matrix(hB, arg, hipblas_client_never_set_nan, hipblas_general_matrix, false, true);
    hB_res = hB;

    T* A = (T*)hA;

    // scale A to avoid singularities
    for(int i = 0; i < N; i++)
    {
        for(int j = 0; j < N; j++)
        {
            if(i == j)
                A[i + j * lda] += 400;
            else
                A[i + j * lda] -= 4;
        }
    }

    // Copy data from CPU to device
    CHECK_HIP_ERROR(dA.transfer_from(hA));
    CHECK_HIP_ERROR(dB.transfer_from(hB));

    if(arg.unit_check || arg.norm_check)
    {
        /* =====================================================================
            HIPBLAS
        =================================================================== */
        CHECK_HIPBLAS_ERROR(
            hipblasGelsFn(handle, trans, M, N, nrhs, dA, lda, dB, ldb, &info_input, dInfo));

        // copy output from device to CPU
        CHECK_HIP_ERROR(hB_res.transfer_from(dB));
        CHECK_HIP_ERROR(hipMemcpy(&info_res, dInfo, sizeof(int), hipMemcpyDeviceToHost));

        /* =====================================================================
           CPU LAPACK
        =================================================================== */
        int            sizeW = std::max(1, std::min(M, N) + std::max(std::min(M, N), nrhs));
        host_vector<T> hW(sizeW);

        info = ref_gels(transc, M, N, nrhs, hA.data(), lda, hB.data(), ldb, hW.data(), sizeW);

        hipblas_error
            = norm_check_general<T>('F', std::max(M, N), nrhs, ldb, hB.data(), hB_res.data());

        if(info != info_res)
            hipblas_error += 1.0;
        if(info_input != 0)
            hipblas_error += 1.0;

        if(arg.unit_check)
        {
            double eps       = std::numeric_limits<U>::epsilon();
            double tolerance = N * eps * 100;
            int    zero      = 0;

            unit_check_error(hipblas_error, tolerance);
            unit_check_general(1, 1, 1, &zero, &info_input);
        }
    }

    if(arg.timing)
    {
        hipStream_t stream;
        CHECK_HIPBLAS_ERROR(hipblasGetStream(handle, &stream));

        int runs = arg.cold_iters + arg.iters;
        for(int iter = 0; iter < runs; iter++)
        {
            if(iter == arg.cold_iters)
                gpu_time_used = get_time_us_sync(stream);

            CHECK_HIPBLAS_ERROR(
                hipblasGelsFn(handle, trans, M, N, nrhs, dA, lda, dB, ldb, &info_input, dInfo));
        }
        gpu_time_used = get_time_us_sync(stream) - gpu_time_used;

        hipblasGelsModel{}.log_args<T>(std::cout,
                                       arg,
                                       gpu_time_used,
                                       ArgumentLogging::NA_value,
                                       ArgumentLogging::NA_value,
                                       hipblas_error);
    }
}