/* ************************************************************************
 * Copyright (c) 2020 Advanced Micro Devices, Inc.
 *
 * 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
 * copies 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
 * IMPLIED, 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 CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * ************************************************************************ */

#include "definitions.h"
#include "handle.h"
#include "rocsparse.h"
#include "utility.h"

#include "rocsparse_gthr.hpp"

template <typename I, typename T>
rocsparse_status rocsparse_gather_template(rocsparse_handle      handle,
                                           rocsparse_dnvec_descr y,
                                           rocsparse_spvec_descr x)
{
    return rocsparse_gthr_template<I, T>(handle,
                                         (I)x->nnz,
                                         (const T*)y->values,
                                         (T*)x->val_data,
                                         (const I*)x->idx_data,
                                         x->idx_base);
}

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

extern "C" rocsparse_status rocsparse_gather(rocsparse_handle            handle,
                                             const rocsparse_dnvec_descr y,
                                             rocsparse_spvec_descr       x)
{
    // Check for invalid handle
    RETURN_IF_INVALID_HANDLE(handle);

    // Logging
    log_trace(handle, "rocsparse_gather", (const void*&)y, (const void*&)x);

    // Check for invalid descriptors
    RETURN_IF_NULLPTR(x);
    RETURN_IF_NULLPTR(y);

    // Check if descriptors are initialized
    if(x->init == false || y->init == false)
    {
        return rocsparse_status_not_initialized;
    }

    // Check for matching types while we do not support mixed precision computation
    if(x->data_type != y->data_type)
    {
        return rocsparse_status_not_implemented;
    }

    // single real ; i32
    if(x->idx_type == rocsparse_indextype_i32 && x->data_type == rocsparse_datatype_f32_r)
    {
        return rocsparse_gather_template<int32_t, float>(handle, y, x);
    }
    // double real ; i32
    if(x->idx_type == rocsparse_indextype_i32 && x->data_type == rocsparse_datatype_f64_r)
    {
        return rocsparse_gather_template<int32_t, double>(handle, y, x);
    }
    // single complex ; i32
    if(x->idx_type == rocsparse_indextype_i32 && x->data_type == rocsparse_datatype_f32_c)
    {
        return rocsparse_gather_template<int32_t, rocsparse_float_complex>(handle, y, x);
    }
    // double complex ; i32
    if(x->idx_type == rocsparse_indextype_i32 && x->data_type == rocsparse_datatype_f64_c)
    {
        return rocsparse_gather_template<int32_t, rocsparse_double_complex>(handle, y, x);
    }
    // single real ; i64
    if(x->idx_type == rocsparse_indextype_i64 && x->data_type == rocsparse_datatype_f32_r)
    {
        return rocsparse_gather_template<int64_t, float>(handle, y, x);
    }
    // double real ; i64
    if(x->idx_type == rocsparse_indextype_i64 && x->data_type == rocsparse_datatype_f64_r)
    {
        return rocsparse_gather_template<int64_t, double>(handle, y, x);
    }
    // single complex ; i64
    if(x->idx_type == rocsparse_indextype_i64 && x->data_type == rocsparse_datatype_f32_c)
    {
        return rocsparse_gather_template<int64_t, rocsparse_float_complex>(handle, y, x);
    }
    // double complex ; i64
    if(x->idx_type == rocsparse_indextype_i64 && x->data_type == rocsparse_datatype_f64_c)
    {
        return rocsparse_gather_template<int64_t, rocsparse_double_complex>(handle, y, x);
    }

    return rocsparse_status_not_implemented;
}
