//------------------------------------------------------------------------------
// GB_mex_subref_symbolic: S=A(I,J)
//------------------------------------------------------------------------------

// SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2020, All Rights Reserved.
// http://suitesparse.com   See GraphBLAS/Doc/License.txt for license.

//------------------------------------------------------------------------------

#include "GB_mex.h"

#define USAGE "C = GB_mex_subref_symbolic (A, I, J)"

#define FREE_ALL                        \
{                                       \
    GB_MATRIX_FREE (&A) ;               \
    GB_MATRIX_FREE (&C) ;               \
    GB_mx_put_global (true, 0) ;        \
}

void mexFunction
(
    int nargout,
    mxArray *pargout [ ],
    int nargin,
    const mxArray *pargin [ ]
)
{

    bool malloc_debug = GB_mx_get_global (true) ;
    GrB_Matrix A = NULL ;
    GrB_Matrix C = NULL ;
    GrB_Index *I = NULL, ni = 0, I_range [3] ;
    GrB_Index *J = NULL, nj = 0, J_range [3] ;
    bool ignore ;

    // check inputs
    GB_WHERE (USAGE) ;
    if (nargout > 1 || nargin != 3)
    {
        mexErrMsgTxt ("Usage: " USAGE) ;
    }

    #define GET_DEEP_COPY ;
    #define FREE_DEEP_COPY ;

    // get A (shallow copy)
    A = GB_mx_mxArray_to_Matrix (pargin [0], "A", false, true) ;
    if (A == NULL)
    {
        FREE_ALL ;
        mexErrMsgTxt ("A failed") ;
    }

    // get I
    if (!GB_mx_mxArray_to_indices (&I, pargin [1], &ni, I_range, &ignore))
    {
        FREE_ALL ;
        mexErrMsgTxt ("I failed") ;
    }

    // get J
    if (!GB_mx_mxArray_to_indices (&J, pargin [2], &nj, J_range, &ignore))
    {
        FREE_ALL ;
        mexErrMsgTxt ("J failed") ;
    }

    // C = A(I,J) or A(J,I)', no need to check dimensions of C
    METHOD (GB_subref (&C, true , A, I, ni, J, nj, true, true, Context)) ;

    // return C to MATLAB as a struct
    pargout [0] = GB_mx_Matrix_to_mxArray (&C, "C subref symbolic", true) ;

    FREE_ALL ;
}

