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*****************************************************************************
* Contents: Native middle-level C interface to LAPACK function cgedmd
* Author: Intel Corporation
*****************************************************************************/

#include "lapacke_utils.h"

lapack_int LAPACKE_cgedmd_work( int matrix_layout, char jobs, char jobz,
                                char jobr, char jobf, lapack_int whtsvd, lapack_int m,
                                lapack_int n, lapack_complex_float* x, lapack_int ldx,
                                lapack_complex_float* y, lapack_int ldy, lapack_int nrnk,
                                float* tol, lapack_int k, lapack_complex_float* eigs,
                                lapack_complex_float* z, lapack_int ldz,
                                float* res, lapack_complex_float* b,
                                lapack_int ldb, lapack_complex_float* w,
                                lapack_int ldw, lapack_complex_float* s, lapack_int lds,
                                lapack_complex_float* zwork, lapack_int lzwork,
                                float* work, lapack_int lwork,
                                lapack_int* iwork, lapack_int liwork )
{
    lapack_int info = 0;
    if( matrix_layout == LAPACK_COL_MAJOR ) {
        /* Call LAPACK function and adjust info */
        LAPACK_cgedmd( &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,
		       &info );
        if( info < 0 ) {
            info = info - 1;
        }
    } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
        lapack_int ldx_t = MAX(1,m);
        lapack_int ldy_t = MAX(1,m);
        lapack_int ldz_t = MAX(1,m);
        lapack_int ldb_t = MAX(1,m);
        lapack_int ldw_t = MAX(1,m);
        lapack_int lds_t = MAX(1,m);
        lapack_complex_float* x_t = NULL;
        lapack_complex_float* y_t = NULL;
        lapack_complex_float* z_t = NULL;
        lapack_complex_float* b_t = NULL;
        lapack_complex_float* w_t = NULL;
        lapack_complex_float* s_t = NULL;
        /* Check leading dimension(s) */
        if( ldx < n ) {
            info = -9;
            LAPACKE_xerbla( "LAPACKE_cgedmd_work", info );
            return info;
        }
        if( ldy < n ) {
            info = -11;
            LAPACKE_xerbla( "LAPACKE_cgedmd_work", info );
            return info;
        }
        if( ldz < n ) {
            info = -16;
            LAPACKE_xerbla( "LAPACKE_cgedmd_work", info );
            return info;
        }
        if( ldb < n ) {
            info = -19;
            LAPACKE_xerbla( "LAPACKE_cgedmd_work", info );
            return info;
        }
        if( ldw < n ) {
            info = -21;
            LAPACKE_xerbla( "LAPACKE_cgedmd_work", info );
            return info;
        }
        if( lds < n ) {
            info = -23;
            LAPACKE_xerbla( "LAPACKE_cgedmd_work", info );
            return info;
        }
        /* Query optimal working array(s) size if requested */
        if( lwork == -1 ) {
            LAPACK_cgedmd( &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, &info );
            return (info < 0) ? (info - 1) : info;
        }
        /* Allocate memory for temporary array(s) */
        x_t = (lapack_complex_float*)LAPACKE_malloc( sizeof(lapack_complex_float) * ldx_t * MAX(1,n) );
        if( x_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_0;
        }
        y_t = (lapack_complex_float*)LAPACKE_malloc( sizeof(lapack_complex_float) * ldy_t * MAX(1,n) );
        if( y_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_1;
        }
        z_t = (lapack_complex_float*)LAPACKE_malloc( sizeof(lapack_complex_float) * ldz_t * MAX(1,n) );
        if( z_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_2;
        }
        b_t = (lapack_complex_float*)LAPACKE_malloc( sizeof(lapack_complex_float) * ldb_t * MAX(1,n) );
        if( b_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_3;
        }
        w_t = (lapack_complex_float*)LAPACKE_malloc( sizeof(lapack_complex_float) * ldw_t * MAX(1,n) );
        if( w_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_4;
        }
        s_t = (lapack_complex_float*)LAPACKE_malloc( sizeof(lapack_complex_float) * lds_t * MAX(1,n) );
        if( s_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_5;
        }
        /* Transpose input matrices */
        LAPACKE_cge_trans( matrix_layout, m, n, x, ldx, x_t, ldx_t );
        LAPACKE_cge_trans( matrix_layout, m, n, y, ldy, y_t, ldy_t );
        LAPACKE_cge_trans( matrix_layout, m, n, z, ldz, z_t, ldz_t );
        LAPACKE_cge_trans( matrix_layout, m, n, b, ldb, b_t, ldb_t );
        LAPACKE_cge_trans( matrix_layout, m, n, w, ldw, w_t, ldw_t );
        LAPACKE_cge_trans( matrix_layout, m, n, s, lds, s_t, lds_t );
        /* Call LAPACK function and adjust info */
        LAPACK_cgedmd( &jobs, &jobz, &jobr, &jobf, &whtsvd, &m, &n, x_t,
		       &ldx_t, y_t, &ldy_t, &nrnk, tol, &k, eigs, z_t, &ldz_t,
		       res, b_t, &ldb_t, w_t, &ldw_t, s_t, &lds_t, zwork,
		       &lzwork, work, &lwork, iwork, &liwork, &info );
        if( info < 0 ) {
            info = info - 1;
        }
        /* Transpose output matrices */
        LAPACKE_cge_trans( LAPACK_COL_MAJOR, m, n, x_t, ldx_t, x, ldx );
        LAPACKE_cge_trans( LAPACK_COL_MAJOR, m, n, y_t, ldy_t, y, ldy );
        LAPACKE_cge_trans( LAPACK_COL_MAJOR, m, n, z_t, ldz_t, z, ldz );
        LAPACKE_cge_trans( LAPACK_COL_MAJOR, m, n, b_t, ldb_t, b, ldb );
        LAPACKE_cge_trans( LAPACK_COL_MAJOR, m, n, w_t, ldw_t, w, ldw );
        LAPACKE_cge_trans( LAPACK_COL_MAJOR, m, n, s_t, lds_t, s, lds );
        /* Release memory and exit */
        LAPACKE_free( s_t );
exit_level_5:
        LAPACKE_free( w_t );
exit_level_4:
        LAPACKE_free( b_t );
exit_level_3:
        LAPACKE_free( z_t );
exit_level_2:
        LAPACKE_free( y_t );
exit_level_1:
        LAPACKE_free( x_t );
exit_level_0:
        if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
            LAPACKE_xerbla( "LAPACKE_cgedmd_work", info );
        }
    } else {
        info = -1;
        LAPACKE_xerbla( "LAPACKE_cgedmd_work", info );
    }
    return info;
}
