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*****************************************************************************
* Contents: Native high-level C interface to LAPACK function zgedmd
* Author: Intel Corporation
*****************************************************************************/

#include "lapacke_utils.h"

lapack_int LAPACKE_zgedmd( int matrix_layout, char jobs, char jobz, char jobr,
			   char jobf, lapack_int whtsvd, lapack_int m,
			   lapack_int n, lapack_complex_double* x,
			   lapack_int ldx, lapack_complex_double* y,
			   lapack_int ldy, lapack_int nrnk, double *tol, lapack_int k,
                           lapack_complex_double* eigs, lapack_complex_double* z,
                           lapack_int ldz, double* res,
                           lapack_complex_double* b, lapack_int ldb,
                           lapack_complex_double* zw, lapack_int lzw,
                           lapack_complex_double* w, lapack_int ldw,
                           lapack_complex_double* s, lapack_int lds)
{
    lapack_int info = 0;
    lapack_int lwork = -1;
    lapack_int liwork = -1;
    lapack_int lzwork = -1;
    lapack_complex_double* zwork = NULL;
    double* work = NULL;
    lapack_int* iwork = NULL;
    double work_query;
    lapack_int iwork_query;
    lapack_complex_double zwork_query;
    if( matrix_layout != LAPACK_COL_MAJOR && matrix_layout != LAPACK_ROW_MAJOR ) {
        LAPACKE_xerbla( "LAPACKE_zgedmd", -1 );
        return -1;
    }
#ifndef LAPACK_DISABLE_NAN_CHECK
    if( LAPACKE_get_nancheck() ) {
        /* Optionally check input matrices for NaNs */
        if( LAPACKE_zge_nancheck( matrix_layout, m, n, x, ldx ) ) {
            return -8;
        }
        if( LAPACKE_zge_nancheck( matrix_layout, m, n, y, ldy ) ) {
            return -10;
        }
        if( LAPACKE_zge_nancheck( matrix_layout, m, n, z, ldz ) ) {
            return -15;
        }
        if( LAPACKE_zge_nancheck( matrix_layout, m, n, b, ldb ) ) {
            return -18;
        }
        if( LAPACKE_zge_nancheck( matrix_layout, m, n, s, lds ) ) {
            return -20;
        }
        if( LAPACKE_zge_nancheck( matrix_layout, m, n, w, ldw ) ) {
            return -22;
        }
    }
#endif
    /* Query optimal working array(s) size */
    info = LAPACKE_zgedmd_work( matrix_layout, jobs, jobz, jobr, jobf, whtsvd,
				m, n, x, ldx, y, ldy, nrnk, tol, k, eigs, z, ldz,
				res, b, ldb, w, ldw, s, lds, &zwork_query, lzwork,
				&work_query, lwork, &iwork_query, liwork );

    if( info != 0 ) {
        goto exit_level_0;
    }
    lwork  = LAPACK_Z2INT( work_query );
    liwork = iwork_query;
    lzwork = LAPACK_Z2INT( zwork_query );
    /* Allocate memory for work arrays */
    zwork  = (lapack_complex_double*)LAPACKE_malloc( sizeof(lapack_complex_double) * lzwork );
    if( zwork == NULL ) {
        info = LAPACK_WORK_MEMORY_ERROR;
        goto exit_level_0;
    }
    work  = (double*)LAPACKE_malloc( sizeof(double) * lwork );
    if( work == NULL ) {
        info = LAPACK_WORK_MEMORY_ERROR;
        goto exit_level_1;
    }
    iwork = (lapack_int*)LAPACKE_malloc( sizeof(lapack_int) * liwork );
    if( iwork == NULL ) {
        info = LAPACK_WORK_MEMORY_ERROR;
        goto exit_level_2;
    }
    /* Call middle-level interface */
    info = LAPACKE_zgedmd_work( matrix_layout, jobs, jobz, jobr, jobf, whtsvd,
				m, n, x, ldx, y, ldy, nrnk, tol, k, eigs, z, ldz,
				res, b, ldb, w, ldw, s, lds, zwork, lzwork,
				work, lwork, iwork, liwork );
    /* Release memory and exit */
    LAPACKE_free( iwork );
exit_level_2:
    LAPACKE_free( work );
exit_level_1:
    LAPACKE_free( zwork );
exit_level_0:
    if( info == LAPACK_WORK_MEMORY_ERROR ) {
        LAPACKE_xerbla( "LAPACKE_zgedmd", info );
    }
    return info;
}
