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

#include "lapacke_utils.h"

lapack_int LAPACKE_zggsvp_work( int matrix_layout, char jobu, char jobv,
                                char jobq, lapack_int m, lapack_int p,
                                lapack_int n, lapack_complex_double* a,
                                lapack_int lda, lapack_complex_double* b,
                                lapack_int ldb, double tola, double tolb,
                                lapack_int* k, lapack_int* l,
                                lapack_complex_double* u, lapack_int ldu,
                                lapack_complex_double* v, lapack_int ldv,
                                lapack_complex_double* q, lapack_int ldq,
                                lapack_int* iwork, double* rwork,
                                lapack_complex_double* tau,
                                lapack_complex_double* work )
{
    lapack_int info = 0;
    if( matrix_layout == LAPACK_COL_MAJOR ) {
        /* Call LAPACK function and adjust info */
        LAPACK_zggsvp( &jobu, &jobv, &jobq, &m, &p, &n, a, &lda, b, &ldb, &tola,
                       &tolb, k, l, u, &ldu, v, &ldv, q, &ldq, iwork, rwork,
                       tau, work, &info );
        if( info < 0 ) {
            info = info - 1;
        }
    } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
        lapack_int lda_t = MAX(1,m);
        lapack_int ldb_t = MAX(1,p);
        lapack_int ldq_t = MAX(1,n);
        lapack_int ldu_t = MAX(1,m);
        lapack_int ldv_t = MAX(1,p);
        lapack_complex_double* a_t = NULL;
        lapack_complex_double* b_t = NULL;
        lapack_complex_double* u_t = NULL;
        lapack_complex_double* v_t = NULL;
        lapack_complex_double* q_t = NULL;
        /* Check leading dimension(s) */
        if( lda < n ) {
            info = -9;
            LAPACKE_xerbla( "LAPACKE_zggsvp_work", info );
            return info;
        }
        if( ldb < n ) {
            info = -11;
            LAPACKE_xerbla( "LAPACKE_zggsvp_work", info );
            return info;
        }
        if( ldq < n ) {
            info = -21;
            LAPACKE_xerbla( "LAPACKE_zggsvp_work", info );
            return info;
        }
        if( ldu < m ) {
            info = -17;
            LAPACKE_xerbla( "LAPACKE_zggsvp_work", info );
            return info;
        }
        if( ldv < m ) {
            info = -19;
            LAPACKE_xerbla( "LAPACKE_zggsvp_work", info );
            return info;
        }
        /* Allocate memory for temporary array(s) */
        a_t = (lapack_complex_double*)
            LAPACKE_malloc( sizeof(lapack_complex_double) * lda_t * MAX(1,n) );
        if( a_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_0;
        }
        b_t = (lapack_complex_double*)
            LAPACKE_malloc( sizeof(lapack_complex_double) * ldb_t * MAX(1,n) );
        if( b_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_1;
        }
        if( LAPACKE_lsame( jobu, 'u' ) ) {
            u_t = (lapack_complex_double*)
                LAPACKE_malloc( sizeof(lapack_complex_double) *
                                ldu_t * MAX(1,m) );
            if( u_t == NULL ) {
                info = LAPACK_TRANSPOSE_MEMORY_ERROR;
                goto exit_level_2;
            }
        }
        if( LAPACKE_lsame( jobv, 'v' ) ) {
            v_t = (lapack_complex_double*)
                LAPACKE_malloc( sizeof(lapack_complex_double) *
                                ldv_t * MAX(1,m) );
            if( v_t == NULL ) {
                info = LAPACK_TRANSPOSE_MEMORY_ERROR;
                goto exit_level_3;
            }
        }
        if( LAPACKE_lsame( jobq, 'q' ) ) {
            q_t = (lapack_complex_double*)
                LAPACKE_malloc( sizeof(lapack_complex_double) *
                                ldq_t * MAX(1,n) );
            if( q_t == NULL ) {
                info = LAPACK_TRANSPOSE_MEMORY_ERROR;
                goto exit_level_4;
            }
        }
        /* Transpose input matrices */
        LAPACKE_zge_trans( matrix_layout, m, n, a, lda, a_t, lda_t );
        LAPACKE_zge_trans( matrix_layout, p, n, b, ldb, b_t, ldb_t );
        /* Call LAPACK function and adjust info */
        LAPACK_zggsvp( &jobu, &jobv, &jobq, &m, &p, &n, a_t, &lda_t, b_t,
                       &ldb_t, &tola, &tolb, k, l, u_t, &ldu_t, v_t, &ldv_t,
                       q_t, &ldq_t, iwork, rwork, tau, work, &info );
        if( info < 0 ) {
            info = info - 1;
        }
        /* Transpose output matrices */
        LAPACKE_zge_trans( LAPACK_COL_MAJOR, m, n, a_t, lda_t, a, lda );
        LAPACKE_zge_trans( LAPACK_COL_MAJOR, p, n, b_t, ldb_t, b, ldb );
        if( LAPACKE_lsame( jobu, 'u' ) ) {
            LAPACKE_zge_trans( LAPACK_COL_MAJOR, m, m, u_t, ldu_t, u, ldu );
        }
        if( LAPACKE_lsame( jobv, 'v' ) ) {
            LAPACKE_zge_trans( LAPACK_COL_MAJOR, p, m, v_t, ldv_t, v, ldv );
        }
        if( LAPACKE_lsame( jobq, 'q' ) ) {
            LAPACKE_zge_trans( LAPACK_COL_MAJOR, n, n, q_t, ldq_t, q, ldq );
        }
        /* Release memory and exit */
        if( LAPACKE_lsame( jobq, 'q' ) ) {
            LAPACKE_free( q_t );
        }
exit_level_4:
        if( LAPACKE_lsame( jobv, 'v' ) ) {
            LAPACKE_free( v_t );
        }
exit_level_3:
        if( LAPACKE_lsame( jobu, 'u' ) ) {
            LAPACKE_free( u_t );
        }
exit_level_2:
        LAPACKE_free( b_t );
exit_level_1:
        LAPACKE_free( a_t );
exit_level_0:
        if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
            LAPACKE_xerbla( "LAPACKE_zggsvp_work", info );
        }
    } else {
        info = -1;
        LAPACKE_xerbla( "LAPACKE_zggsvp_work", info );
    }
    return info;
}
