/* ************************************************************************
 * Copyright (c) 2019-2021 Advanced Micro Devices, Inc.
 * ************************************************************************ */

#include "roclapack_geqlf.hpp"

template <typename T, typename U>
rocblas_status rocsolver_geqlf_impl(rocblas_handle handle,
                                    const rocblas_int m,
                                    const rocblas_int n,
                                    U A,
                                    const rocblas_int lda,
                                    T* ipiv)
{
    ROCSOLVER_ENTER_TOP("geqlf", "-m", m, "-n", n, "--lda", lda);

    if(!handle)
        return rocblas_status_invalid_handle;

    // argument checking
    rocblas_status st = rocsolver_geql2_geqlf_argCheck(handle, m, n, lda, A, ipiv);
    if(st != rocblas_status_continue)
        return st;

    // working with unshifted arrays
    rocblas_int shiftA = 0;

    // normal (non-batched non-strided) execution
    rocblas_stride strideA = 0;
    rocblas_stride stridep = 0;
    rocblas_int batch_count = 1;

    // memory workspace sizes:
    // size for constants in rocblas calls
    size_t size_scalars;
    // size of arrays of pointers (for batched cases) and re-usable workspace
    size_t size_work_workArr, size_workArr;
    // extra requirements for calling GEQL2 and to store temporary triangular factor
    size_t size_Abyx_norms_trfact;
    // extra requirements for calling GEQL2 and LARFB
    size_t size_diag_tmptr;
    rocsolver_geqlf_getMemorySize<false, T>(m, n, batch_count, &size_scalars, &size_work_workArr,
                                            &size_Abyx_norms_trfact, &size_diag_tmptr, &size_workArr);

    if(rocblas_is_device_memory_size_query(handle))
        return rocblas_set_optimal_device_memory_size(handle, size_scalars, size_work_workArr,
                                                      size_Abyx_norms_trfact, size_diag_tmptr,
                                                      size_workArr);

    // memory workspace allocation
    void *scalars, *work_workArr, *Abyx_norms_trfact, *diag_tmptr, *workArr;
    rocblas_device_malloc mem(handle, size_scalars, size_work_workArr, size_Abyx_norms_trfact,
                              size_diag_tmptr, size_workArr);

    if(!mem)
        return rocblas_status_memory_error;

    scalars = mem[0];
    work_workArr = mem[1];
    Abyx_norms_trfact = mem[2];
    diag_tmptr = mem[3];
    workArr = mem[4];
    if(size_scalars > 0)
        init_scalars(handle, (T*)scalars);

    // execution
    return rocsolver_geqlf_template<false, false, T>(
        handle, m, n, A, shiftA, lda, strideA, ipiv, stridep, batch_count, (T*)scalars,
        work_workArr, (T*)Abyx_norms_trfact, (T*)diag_tmptr, (T**)workArr);
}

/*
 * ===========================================================================
 *    C wrapper
 * ===========================================================================
 */

extern "C" {

rocblas_status rocsolver_sgeqlf(rocblas_handle handle,
                                const rocblas_int m,
                                const rocblas_int n,
                                float* A,
                                const rocblas_int lda,
                                float* ipiv)
{
    return rocsolver_geqlf_impl<float>(handle, m, n, A, lda, ipiv);
}

rocblas_status rocsolver_dgeqlf(rocblas_handle handle,
                                const rocblas_int m,
                                const rocblas_int n,
                                double* A,
                                const rocblas_int lda,
                                double* ipiv)
{
    return rocsolver_geqlf_impl<double>(handle, m, n, A, lda, ipiv);
}

rocblas_status rocsolver_cgeqlf(rocblas_handle handle,
                                const rocblas_int m,
                                const rocblas_int n,
                                rocblas_float_complex* A,
                                const rocblas_int lda,
                                rocblas_float_complex* ipiv)
{
    return rocsolver_geqlf_impl<rocblas_float_complex>(handle, m, n, A, lda, ipiv);
}

rocblas_status rocsolver_zgeqlf(rocblas_handle handle,
                                const rocblas_int m,
                                const rocblas_int n,
                                rocblas_double_complex* A,
                                const rocblas_int lda,
                                rocblas_double_complex* ipiv)
{
    return rocsolver_geqlf_impl<rocblas_double_complex>(handle, m, n, A, lda, ipiv);
}

} // extern C