/*===========================================================================
*
*                            PUBLIC DOMAIN NOTICE
*               National Center for Biotechnology Information
*
*  This software/database is a "United States Government Work" under the
*  terms of the United States Copyright Act.  It was written as part of
*  the author's official duties as a United States Government employee and
*  thus cannot be copyrighted.  This software/database is freely available
*  to the public for use. The National Library of Medicine and the U.S.
*  Government have not placed any restriction on its use or reproduction.
*
*  Although all reasonable efforts have been taken to ensure the accuracy
*  and reliability of the software and data, the NLM and the U.S.
*  Government do not and cannot warrant the performance or results that
*  may be obtained by using this software or data. The NLM and the U.S.
*  Government disclaim all warranties, express or implied, including
*  warranties of performance, merchantability or fitness for any particular
*  purpose.
*
*  Please cite the author in any work or product based on this material.
*
* ===========================================================================
*
*/

#include "read_fkt.h"
#include "sam-unaligned.h"
#include <kapp/main.h>
#include <sysalloc.h>
#include <ctype.h>

#define COL_READ "(INSDC:dna:text)READ"
#define COL_REF_NAME "(ascii)REF_NAME"
#define COL_REF_SEQ_ID "(ascii)REF_SEQ_ID"
#define COL_REF_POS "(INSDC:coord:zero)REF_POS"

typedef struct prim_table_ctx
{
    const VCursor * cursor;

    uint32_t ref_name_idx;
    uint32_t ref_seq_id_idx;
    uint32_t ref_pos_idx;
} prim_table_ctx;


static rc_t prepare_prim_table_ctx( const samdump_opts * const opts,
                                    const input_table * const itab,
                                    prim_table_ctx * const ptx )
{
    rc_t rc;

    if ( opts->cursor_cache_size == 0 )
        rc = VTableCreateCursorRead( itab->tab, &ptx->cursor );
    else
        rc = VTableCreateCachedCursorRead( itab->tab, &ptx->cursor, opts->cursor_cache_size );
    if ( rc != 0 )
    {
        (void)PLOGERR( klogInt, ( klogInt, rc, "VTableCreateCursorRead( PRIMARY_ALIGNMENT ) for $(tn) failed", "tn=%s", itab->path ) );
    }
    else
    {
        rc = add_column( ptx->cursor, COL_REF_NAME, &ptx->ref_name_idx );
        if ( rc == 0 )
            rc = add_column( ptx->cursor, COL_REF_SEQ_ID, &ptx->ref_seq_id_idx );
        if ( rc == 0 )
            rc = add_column( ptx->cursor, COL_REF_POS, &ptx->ref_pos_idx );
        if ( rc == 0 )
        {
            rc = VCursorOpen( ptx->cursor );
            if ( rc != 0 )
            {
                (void)PLOGERR( klogInt, ( klogInt, rc, "VCursorOpen( PRIMARY_ALIGNMENT ) for $(tn) failed", "tn=%s", itab->path ) );
            }
        }
    }
    return rc;
}


#define COL_ALIGN_COUNT "(U8)ALIGNMENT_COUNT"
#define COL_SPOT_ID "(INSDC:SRA:spotid_t)SPOT_ID"
#define COL_PRIM_AL_ID "(I64)PRIMARY_ALIGNMENT_ID"
#define COL_READ_TYPE "(INSDC:SRA:xread_type)READ_TYPE"
#define COL_READ_FILTER "(INSDC:SRA:read_filter)READ_FILTER"
#define COL_READ_LEN "(INSDC:coord:len)READ_LEN"
#define COL_READ_START "(INSDC:coord:zero)READ_START"
/* #define COL_QUALITY "(INSDC:quality:text:phred_33)QUALITY" */
#define COL_QUALITY "(INSDC:quality:phred)QUALITY"
#define COL_SPOT_GROUP "(ascii)SPOT_GROUP"
#define COL_NAME "(ascii)NAME"
#define COL_LNK_GROUP "(ascii)LINKAGE_GROUP"

typedef struct seq_table_ctx
{
    const VCursor * cursor;

    uint32_t align_count_idx;
    uint32_t prim_al_id_idx;
    uint32_t read_type_idx;
    uint32_t read_filter_idx;
    uint32_t read_len_idx;
    uint32_t read_start_idx;
    uint32_t read_idx;
    uint32_t quality_idx;
    uint32_t spot_group_idx;
    uint32_t name_idx;
    uint32_t lnk_group_idx;
} seq_table_ctx;


static rc_t prepare_seq_table_ctx( const samdump_opts * const opts,
                                   const input_table * const itab,
                                   seq_table_ctx * const stx )
{
    struct KNamelist * available_columns;
    rc_t rc = VTableListReadableColumns ( itab->tab, &available_columns );
    if ( rc != 0 )
    {
        (void)PLOGERR( klogInt, ( klogInt, rc, 
            "VTableListReadableColumns( SEQUENCE ) for $(tn) failed", "tn=%s", itab->path ) );
    }
    else
    {
        if ( opts->cursor_cache_size == 0 )
            rc = VTableCreateCursorRead( itab->tab, &stx->cursor );
        else
            rc = VTableCreateCachedCursorRead( itab->tab, &stx->cursor, opts->cursor_cache_size );
        if ( rc != 0 )
        {
            (void)PLOGERR( klogInt, ( klogInt, rc, "VTableCreateCursorRead( SEQUENCE ) for $(tn) failed", "tn=%s", itab->path ) );
        }
        else
        {
            add_opt_column( stx->cursor, available_columns, COL_ALIGN_COUNT, &stx->align_count_idx ); /* read_fkt.c */
            add_opt_column( stx->cursor, available_columns, COL_PRIM_AL_ID, &stx->prim_al_id_idx );
            add_opt_column( stx->cursor, available_columns, COL_NAME, &stx->name_idx );
            add_opt_column( stx->cursor, available_columns, COL_LNK_GROUP, &stx->lnk_group_idx );
            
            if ( rc == 0 )
                rc = add_column( stx->cursor, COL_READ_TYPE, &stx->read_type_idx ); /* read_fkt.c */
            if ( rc == 0 )
                rc = add_column( stx->cursor, COL_READ_FILTER, &stx->read_filter_idx );
            if ( rc == 0 )
                rc = add_column( stx->cursor, COL_READ_LEN, &stx->read_len_idx );
            if ( rc == 0 )
                rc = add_column( stx->cursor, COL_READ_START, &stx->read_start_idx );
            if ( rc == 0 )
                rc = add_column( stx->cursor, COL_READ, &stx->read_idx );
            if ( rc == 0 )
                rc = add_column( stx->cursor, COL_QUALITY, &stx->quality_idx );
            if ( rc == 0 )
                rc = add_column( stx->cursor, COL_SPOT_GROUP, &stx->spot_group_idx );
        }
        KNamelistRelease( available_columns );
    }
    return rc;
}


typedef struct seq_row
{
    uint32_t nreads;

    bool fully_unaligned;
    bool partly_unaligned;
    bool filtered_out;
} seq_row;


static rc_t complain_size_diff( int64_t row_id, const char * txt )
{
    rc_t rc = RC( rcExe, rcNoTarg, rcConstructing, rcSize, rcInvalid );
    (void)PLOGERR( klogInt, ( klogInt, rc, "in row $(rn) of SEQUENCE.$(tx)", "rn=%ld,tx=%s", row_id, txt ) );
    return rc;
}


static rc_t read_seq_row( const samdump_opts * const opts,
                          const seq_table_ctx * const stx,
                          const int64_t row_id,
                          seq_row * const row )
{
    rc_t rc = 0;

    if ( stx->align_count_idx == INVALID_COLUMN )
    {
        const INSDC_read_type *ptr;

        row->fully_unaligned = true;
        row->partly_unaligned = false;
        row->filtered_out = false;
        rc = read_INSDC_read_type_ptr( row_id, stx->cursor, stx->read_type_idx, &ptr, &row->nreads, "READ_TYPE" );
    }
    else
    {
        const uint8_t * u8ptr;
        uint32_t len;

        /* ALIGNMENT_COUNT ... only to detect if reads are unaligned, could be done with PRIMARY_ALINGMENT too,
           but this one is only 8 bit instead of 64 bit, that means faster */
        rc = read_uint8_ptr( row_id, stx->cursor, stx->align_count_idx, &u8ptr, &len, "ALIGN_COUNT" );
        if ( rc == 0 )
        {
            uint32_t i, n;

            row->nreads = len;
            for ( i = 0, n = 0; i < len; ++i )
                if ( u8ptr[ i ] != 0 )
                    n++;
            row->fully_unaligned = ( n == 0 );
            row->partly_unaligned = ( n < len && n > 0 );

            if ( row->partly_unaligned )
                row->filtered_out = !opts->print_half_unaligned_reads;
            else if ( row->fully_unaligned )
                row->filtered_out = !opts->print_fully_unaligned_reads;
            else
                row->filtered_out = true;
        }
    }
    return rc;
}


/**********************************************************************************

    0x001   template having multiple fragments in sequencing
            (row->nreads > 1 )

    0x002   each fragment properly aligned according to the aligner
            ( never the case in an unaligned read )

    0x004   fragment unmapped
            ( always true in an unaligned read )

    0x008   next fragment in the template unmapped
            ( is the mate aligned? next: read_idx+1, if read_idx==row->nreads-1 then read_idx-1 )

    0x010   SEQ being reverse complemented
            ( column 'READ_TYPE' has bit READ_TYPE_REVERSE set )

    0x020   SEQ of the next fragment in the template being reversed
            ( is the mate reversed? )

    0x040   the first fragment in the template
            ( read_idx == 0 )

    0x080   the last fragment in the template
            ( read_idx == ( row->nreads - 1 ) )

    0x100   secondary alignment
            ( never the case in an unaligned read )

    0x200   not passing quality controls
            ( column 'READ_FILTER' has bit READ_FILTER_REJECT set )

    0x400   PCR or optical duplicate
            ( column 'READ_FILTER' has bit READ_FILTER_CRITERIA set )

**********************************************************************************/
static uint32_t calculate_unaligned_sam_flags_db( uint32_t nreads,
                                                  uint32_t read_idx,
                                                  uint32_t mate_idx,
                                                  int64_t mate_id,
                                                  const INSDC_read_type * read_type,
                                                  bool reverse_flag,
                                                  const INSDC_read_filter * read_filter )
{
    uint32_t res = 0x04;

    if ( nreads > 1 )
    {
        res |= 0x01;
        /* the following test only make sense if there is a mate */

        if ( mate_id == 0 )
            res |= 0x08;
        if ( ( read_type[ mate_idx ] & READ_TYPE_REVERSE ) == READ_TYPE_REVERSE )
            res |= 0x020;
        if ( read_idx == 0 )
            res |= 0x040;
        if ( read_idx == ( nreads - 1 ) )
            res |= 0x080;
    }

    if ( reverse_flag )
        res |= 0x010;
    if ( ( read_filter[ read_idx ] & READ_FILTER_REJECT ) == READ_FILTER_REJECT )
        res |= 0x200;
    if ( ( read_filter[ read_idx ] & READ_FILTER_CRITERIA ) == READ_FILTER_CRITERIA )
        res |= 0x400;
    return res;
}


const char * ref_name_star = "*";

static rc_t get_mate_info( const prim_table_ctx * const ptx,
                           const matecache * const mc,
                           const input_database * const ids,
                           const int64_t row_id,
                           const int64_t mate_id,
                           const uint32_t nreads,
                           const char ** mate_ref_name,
                           uint32_t * const mate_ref_name_len,
                           INSDC_coord_zero * const mate_ref_pos )
{
    rc_t rc = 0;

    *mate_ref_name = ref_name_star;
    *mate_ref_name_len = 1;
    *mate_ref_pos = 0;
    if ( nreads < 2 )
        return rc;

    if ( mate_id != 0 )
    {
        uint32_t ref_idx;
        int64_t seq_spot_id;
        rc = matecache_lookup_unaligned( mc, ids->db_idx, mate_id, mate_ref_pos, &ref_idx, &seq_spot_id );
        if ( rc == 0 )
        {
            const ReferenceObj* refobj;
            *mate_ref_pos += 1;
            /* now we have to lookup the reference-name based on it's index into the ids->reflist */
            rc = ReferenceList_Get( ids->reflist, &refobj, ref_idx );
            if ( rc != 0 )
            {
                (void)PLOGERR( klogInt, ( klogInt, rc, "in row $(rn) of SEQUENCE.$(rx)", "rn=%ld,rx=%ld", mate_id, row_id ) );
            }
            else
            {
                rc = ReferenceObj_Name( refobj, mate_ref_name );
                if ( rc != 0 )
                {
                    (void)PLOGERR( klogInt, ( klogInt, rc, "in row $(rn) of SEQUENCE.$(rx)", "rn=%ld,rx=%ld", mate_id, row_id ) );
                }
                else
                {
                    *mate_ref_name_len = string_size( *mate_ref_name );
                }
            }
        }
        else if ( GetRCState( rc ) == rcNotFound )
        {
            /* we have a mate and it is aligned! ---> look it up in the PRIMARY_ALIGNMENT - table*/
            const char * ptr;
            uint32_t len;

            rc = read_char_ptr( mate_id, ptx->cursor, ptx->ref_name_idx, &ptr, &len, "REF_NAME" );
            if ( rc == 0 && len > 0 )
            {
                *mate_ref_name = ptr;
                *mate_ref_name_len = len;
            }

            if ( rc == 0 )
            {
                INSDC_coord_zero pos;
                rc = read_INSDC_coord_zero( mate_id, ptx->cursor, ptx->ref_pos_idx, &pos, 0, "REF_POS" );
                if ( rc == 0 )
                {
                    *mate_ref_pos = ( pos + 1 );
                }
            }
        }
    }
    return rc;
}


static rc_t print_sliced_read( const INSDC_dna_text * read,
                               uint32_t read_idx,
                               bool reverse,
                               const INSDC_coord_zero * read_start,
                               const INSDC_coord_len * read_len )
{
    rc_t rc = 0;
    const INSDC_dna_text * ptr = read + read_start[ read_idx ];
    if ( !reverse )
    {
        rc = KOutMsg( "%.*s", read_len[ read_idx ], ptr );
    }
    else
    {
        const char cmp_tbl [] =
        {
            'T', 'V', 'G', 'H', 'E', 'F', 'C', 'D',
            'I', 'J', 'M', 'L', 'K', 'N', 'O', 'P',
            'Q', 'Y', 'S', 'A', 'U', 'B', 'W', 'X',
            'R', 'Z'
        };

        int32_t i = ( read_len[ read_idx ] - 1 );
        while( i >= 0 && rc == 0 )
        {
            int c = ptr [ i ];
            if ( isalpha ( c ) )
            {
                if ( islower ( c )  )
                     c = tolower ( cmp_tbl [ toupper ( c ) - 'A' ] );
                else
                     c = cmp_tbl [ c - 'A' ];
            }

            rc = KOutMsg( "%c", ( char ) c );
            i--;
        }
    }
    return rc;
}


static rc_t print_sliced_quality( const samdump_opts * const opts,
                                  const char * quality,
                                  uint32_t read_idx,
                                  bool reverse,
                                  const INSDC_coord_zero * read_start,
                                  const INSDC_coord_len * read_len )
{
    const char * ptr = quality + read_start[ read_idx ];
    return dump_quality( opts, ptr, read_len[ read_idx ], reverse ); /* sam-dump-opts.c */
}


static rc_t dump_the_other_read( const seq_table_ctx * const stx,
                                 const prim_table_ctx * const ptx,
                                 const int64_t row_id,
                                 const uint32_t mate_idx )
{
    uint32_t row_len;
    const int64_t *prim_al_id_ptr;

    /* read from the SEQUENCE-table the value of the colum "PRIMARY_ALIGNMENT_ID"[ mate_idx ] */
    rc_t rc = read_int64_ptr( row_id, stx->cursor, stx->prim_al_id_idx, &prim_al_id_ptr, &row_len, "PRIM_AL_ID" );
    if ( rc == 0 )
    {
        if ( row_len == 0 )
        {
            (void)PLOGERR( klogInt, ( klogInt, rc, "rowlen zero in row $(rn) of SEQUENCE.PRIMARY_ALIGNMENT_ID", "rn=%ld", row_id ) );
        }
        else if ( mate_idx >= row_len )
        {
            (void)PLOGERR( klogInt, ( klogInt, rc, "mate_idx invalid in row $(rn) of SEQUENCE.PRIMARY_ALIGNMENT_ID", "rn=%ld", row_id ) );
        }
        else
        {
            /* read from the PRIMARY_ALIGNMENT_TABLE the value of the columns "REF_NAME" and "REF_POS" */
            int64_t a_row_id = prim_al_id_ptr[ mate_idx ];
            if ( a_row_id == 0 )
            {
                rc = KOutMsg( "*\t0\t" );
            }
            else
            {
                const char * ref_name;
                uint32_t ref_name_len;
                rc = read_char_ptr( a_row_id, ptx->cursor, ptx->ref_name_idx, &ref_name, &ref_name_len, "REF_NAME" );
                if ( rc == 0 )
                {
                    if ( ref_name_len == 0 )
                    {
                        (void)PLOGERR( klogInt, ( klogInt, rc, "rowlen zero in row $(rn) of PRIM.REF_NAME", "rn=%ld", a_row_id ) );
                    }
                    else
                    {
                        const INSDC_coord_zero *ref_pos;
                        rc = read_INSDC_coord_zero_ptr( a_row_id, ptx->cursor, ptx->ref_pos_idx, &ref_pos, &row_len, "REF_POS" );
                        if ( rc == 0 )
                        {
                            rc = KOutMsg( "%.*s\t%i\t", ref_name_len, ref_name, ref_pos[ 0 ] + 1 );
                        }
                    }
                }
            }
        }
    }
    return rc;
}


static uint32_t calc_mate_idx( const uint32_t n_reads, const uint32_t read_idx )
{
    if ( read_idx == ( n_reads - 1 ) )
        return ( read_idx - 1 );
    else
        return ( read_idx + 1 );
}


static rc_t read_quality( const seq_table_ctx * const stx,
                          const int64_t row_id,
                          const char **quality,
                          const uint32_t read_len )
{
    uint32_t quality_len;
    rc_t rc = read_char_ptr( row_id, stx->cursor, stx->quality_idx, quality, &quality_len, "QUALITY" );
    if ( rc == 0 && read_len != quality_len )
        rc = complain_size_diff( row_id, "QUALITY" );
    return rc;
}


static rc_t read_read_type( const seq_table_ctx * const stx,
                            const int64_t row_id,
                            const INSDC_read_type **read_type,
                            const uint32_t read_len )
{
    uint32_t read_type_len;
    rc_t rc = read_INSDC_read_type_ptr( row_id, stx->cursor, stx->read_type_idx, read_type, &read_type_len, "READ_TYPE" );
    if ( rc == 0 && read_type_len != read_len )
        rc = complain_size_diff( row_id, "READ_TYPE" );
    return rc;
}


static rc_t read_read_filter( const seq_table_ctx * const stx,
                              const int64_t row_id,
                              const INSDC_read_filter **read_filter,
                              const uint32_t read_len )
{
    uint32_t read_filter_len;
    rc_t rc = read_INSDC_read_filter_ptr( row_id, stx->cursor, stx->read_filter_idx, read_filter, &read_filter_len, "READ_FILTER" );
    if ( rc == 0 && read_filter_len != read_len )
        rc = complain_size_diff( row_id, "READ_FILTER" );
    return rc;
}


static rc_t read_read_start( const seq_table_ctx * const stx,
                             const int64_t row_id,
                             const INSDC_coord_zero **read_start,
                             const uint32_t nreads )
{
    uint32_t read_start_len;
    rc_t rc = read_INSDC_coord_zero_ptr( row_id, stx->cursor, stx->read_start_idx, read_start, &read_start_len, "READ_START" );
    if ( rc == 0 && nreads != read_start_len )
        rc = complain_size_diff( row_id, "READ_START" );
    return rc;
}


static rc_t read_read_len( const seq_table_ctx * const stx,
                           const int64_t row_id,
                           const INSDC_coord_len **read_len,
                           const uint32_t nreads )
{
    uint32_t read_len_len;
    rc_t rc = read_INSDC_coord_len_ptr( row_id, stx->cursor, stx->read_len_idx, read_len, &read_len_len, "READ_LEN" );
    if ( rc == 0 && nreads != read_len_len )
        rc = complain_size_diff( row_id, "READ_LEN" );
    return rc;
}


static bool calc_reverse_flag( const samdump_opts * const opts,
                               const uint32_t read_idx,
                               const INSDC_read_type * read_type )
{
    bool res = ( ( read_type[ read_idx ] & READ_TYPE_REVERSE ) == READ_TYPE_REVERSE );
    if ( res )
        res = opts -> reverse_unaligned_reads;
    return res;
}


static rc_t opt_field_spot_group( const seq_table_ctx * const stx, int64_t row_id )
{
    const char * spot_group = NULL;
    uint32_t spot_group_len;    
    rc_t rc = read_char_ptr( row_id, stx->cursor, stx->spot_group_idx, &spot_group, &spot_group_len, "SPOT_GROUP" );
    if ( rc == 0 && spot_group_len > 0 )
        rc = KOutMsg( "\tRG:Z:%.*s", spot_group_len, spot_group );
    return rc;
}

static rc_t opt_field_lnk_group( const seq_table_ctx * const stx, int64_t row_id )
{
    const char * lnk_grp;
    uint32_t lnk_grp_len;
    rc_t rc = read_char_ptr( row_id, stx->cursor, stx->lnk_group_idx, &lnk_grp, &lnk_grp_len, "LINKAGE_GROUP" );
    if ( rc == 0 && lnk_grp_len > 0 )
        rc = KOutMsg( "\tBX:Z:%.*s", lnk_grp_len, lnk_grp );
    return rc;
}

static rc_t dump_seq_row_sam_filtered( const samdump_opts * const opts,
                                       const seq_table_ctx * const stx,
                                       const prim_table_ctx * const ptx,
                                       const matecache * const mc,
                                       const input_database * const ids,
                                       const int64_t row_id,
                                       const uint32_t nreads )
{
    uint32_t read_idx, rd_len, prim_align_ids_len;
    const int64_t * prim_align_ids;
    const char * quality = NULL;
    const INSDC_dna_text * read = NULL;
    const INSDC_read_type * read_type = NULL;
    const INSDC_read_filter * read_filter = NULL;
    const INSDC_coord_zero * read_start = NULL;
    const INSDC_coord_len * read_len;

    rc_t rc = read_int64_ptr( row_id, stx->cursor, stx->prim_al_id_idx, &prim_align_ids, &prim_align_ids_len, "PRIM_AL_ID" );
    if ( rc == 0 && nreads != prim_align_ids_len )
        rc = complain_size_diff( row_id, "PRIMARY_ALIGNMENT_ID" );
    if ( rc == 0 )
        rc = read_read_len( stx, row_id, &read_len, nreads );

    for ( read_idx = 0; ( read_idx < nreads ) && ( rc == 0 ); ++read_idx )
    {
        int64_t align_id = prim_align_ids[ read_idx ];
        if ( align_id == 0 &&              /* read is NOT aligned! */
             read_len[ read_idx ] > 0 )    /* and has a length! */
        {
            uint32_t mate_idx = calc_mate_idx( nreads, read_idx );

            /*  here we have to find out if the read is actually requested: 
                -----------------------------------------------------------
                read from the SEQ-table the ID of the mate in PRIM-table
                look if we have the requested ID in the mate-cache, if not here it ends...
            */
            align_id = prim_align_ids[ mate_idx ];
            if ( align_id != 0 )
            {
                uint32_t ref_idx;
                INSDC_coord_zero mate_ref_pos;
                int64_t seq_spot_id;
                /* this is the filter: we look up in the mate-cache! */
                rc = matecache_lookup_unaligned( mc, ids->db_idx, align_id, &mate_ref_pos, &ref_idx, &seq_spot_id );
                if ( rc == 0 )
                {
                    const ReferenceObj* refobj;
                    /* now we have to lookup the reference-name based on it's index into the ids->reflist */
                    rc = ReferenceList_Get( ids->reflist, &refobj, ref_idx );
                    if ( rc != 0 )
                    {
                        (void)PLOGERR( klogInt, ( klogInt, rc, "in row $(rn) of SEQUENCE.$(rx)", "rn=%ld,rx=%ld", mate_idx, row_id ) );
                    }
                    else
                    {
                        const char * mate_ref_name;
                        rc = ReferenceObj_Name( refobj, &mate_ref_name );
                        if ( rc != 0 )
                        {
                            (void)PLOGERR( klogInt, ( klogInt, rc, "in row $(rn) of SEQUENCE.$(rx)", "rn=%ld,rx=%ld", mate_idx, row_id ) );
                        }
                        else
                        {
                            bool reverse = false;

                            /* SAM-FIELD: QNAME     SRA-column: SPOT_ID ( int64 ) */
                            if ( rc == 0 )
                            {
                                bool print_just_seq_spot_id = true;
                                
                                if ( opts->print_spot_group_in_name )
                                {
                                    const char * spot_group;
                                    uint32_t spot_group_len;
                                    rc = read_char_ptr( row_id, stx->cursor, stx->spot_group_idx, &spot_group, &spot_group_len, "SPOT_GROUP" );
                                    if ( rc == 0 && spot_group_len > 0 )
                                    {
                                        rc = KOutMsg( "%ld.%.*s\t", seq_spot_id, spot_group_len, spot_group );
                                        print_just_seq_spot_id = false;
                                    }
                                }
                                if ( print_just_seq_spot_id )
                                {
                                    rc = KOutMsg( "%ld\t", seq_spot_id );
                                }
                            }
                            
                            if ( rc == 0 && read_type == NULL )
                                rc = read_read_type( stx, row_id, &read_type, nreads );

                            if ( rc == 0 )
                                reverse = calc_reverse_flag( opts, read_idx, read_type );

                            if ( rc == 0 && read_filter == NULL )
                                rc = read_read_filter( stx, row_id, &read_filter, nreads );

                            /* SAM-FIELD: FLAG      SRA-column: calculated from READ_TYPE, READ_FILTER etc. */
                            if ( rc == 0 )
                            {
                                uint32_t sam_flags = calculate_unaligned_sam_flags_db( nreads, read_idx, mate_idx, 
                                                                                    align_id, read_type, reverse, read_filter );
                                rc = KOutMsg( "%u\t", sam_flags );
                            }

                            /* SAM-FIELD: RNAME     SRA-column: none, fix '*' */
                            /* SAM-FIELD: POS       SRA-column: none, fix '0' */
                            /* SAM-FIELD: MAPQ      SRA-column: none, fix '0' */
                            /* SAM-FIELD: CIGAR     SRA-column: none, fix '*' */
                            if ( rc == 0 )
                                rc = KOutMsg( "*\t0\t0\t*\t" );

                            /* SAM-FIELD: RNEXT     SRA-column: found in cache */
                            /* SAM-FIELD: POS       SRA-column: found in cache */
                            if ( rc == 0 )
                                rc = KOutMsg( "%s\t%li\t", mate_ref_name, mate_ref_pos + 1 );

                            /* SAM-FIELD: TLEN      SRA-column: none, fix '0' */
                            if ( rc == 0 )
                                rc = KOutMsg( "0\t" );

                            if ( rc == 0 && read == NULL )
                                rc = read_INSDC_dna_text_ptr( row_id, stx->cursor, stx->read_idx, &read, &rd_len, "READ" );
                            if ( rc == 0 && quality == NULL )
                                rc = read_quality( stx, row_id, &quality, rd_len );
                            if ( rc == 0 && read_start == NULL )
                                rc = read_read_start( stx, row_id, &read_start, nreads );

                            /* SAM-FIELD: SEQ       SRA-column: READ, sliced by READ_START/READ_LEN */
                            if ( rc == 0 )
                                rc = print_sliced_read( read, read_idx, reverse, read_start, read_len );
                            if ( rc == 0 )
                                rc = KOutMsg( "\t" );

                            /* SAM-FIELD: QUAL      SRA-column: QUALITY, sliced by READ_START/READ_LEN */
                            if ( rc == 0 )
                                rc = print_sliced_quality( opts, quality, read_idx, reverse, read_start, read_len );

                            /* OPT SAM-FIELD:       SRA-column: ALIGN_ID */
                            if ( rc == 0 && opts->print_alignment_id_in_column_xi )
                                rc = KOutMsg( "\tXI:i:%u", row_id );

                            /* OPT SAM-FIELD:      SRA-column: SPOT_GROUP */
                            if ( rc == 0 && stx->spot_group_idx != COL_NOT_AVAILABLE )
                                rc = opt_field_spot_group( stx, row_id );

                            /* OPT SAM-FIELD:       SRA-column: LINKAGE_GROUP */
                            if ( rc == 0 && stx->lnk_group_idx != COL_NOT_AVAILABLE )
                                rc = opt_field_lnk_group( stx, row_id );
                            
                            if ( rc == 0 )
                                rc = KOutMsg( "\n" );
                        }
                    }
                }
                else
                {
                    rc = 0;     /* it is OK if an alignment is not found in the cache, do not terminate! */
                }
            }
        }
    }
    return rc;
}


static rc_t dump_seq_prim_row_sam( const samdump_opts * const opts,
                                   const seq_table_ctx * const stx,
                                   const prim_table_ctx * const ptx,
                                   const matecache * const mc,
                                   const input_database * const ids,
                                   const int64_t row_id,
                                   const uint32_t nreads )
{
    uint32_t read_idx, rd_len, prim_align_ids_len;
    const int64_t * prim_align_ids;
    const char * quality = NULL;
    const INSDC_dna_text * read = NULL;
    const INSDC_read_type * read_type = NULL;
    const INSDC_read_filter * read_filter = NULL;
    const INSDC_coord_zero * read_start = NULL;
    const INSDC_coord_len * read_len;

    rc_t rc = read_int64_ptr( row_id, stx->cursor, stx->prim_al_id_idx, &prim_align_ids, &prim_align_ids_len, "PRIM_AL_ID" );
    if ( rc == 0 && nreads != prim_align_ids_len )
        rc = complain_size_diff( row_id, "PRIMARY_ALIGNMENT_ID" );
    if ( rc == 0 )
        rc = read_read_len( stx, row_id, &read_len, nreads );

    for ( read_idx = 0; ( read_idx < nreads ) && ( rc == 0 ); ++read_idx )
    {
        if ( prim_align_ids[ read_idx ] == 0 &&     /* read is NOT aligned! */
             read_len[ read_idx ] > 0 )             /* and has a length! */
        {
            bool reverse = false, mate_available = false;
            uint32_t mate_idx = 0;
            int64_t mate_id = 0;

            if ( nreads > 1 )
            {
                if ( read_idx == ( nreads - 1 ) )
                    mate_idx = read_idx - 1;
                else
                    mate_idx = read_idx + 1;
                mate_available = true;
            }

            if ( mate_available && mate_idx < prim_align_ids_len ) 
                mate_id = prim_align_ids[ mate_idx ];

            if ( rc == 0 && read_type == NULL )
                rc = read_read_type( stx, row_id, &read_type, nreads );
            if ( rc == 0 )
                reverse = calc_reverse_flag( opts, read_idx, read_type );

            if ( rc == 0 && read_filter == NULL )
                rc = read_read_filter( stx, row_id, &read_filter, nreads );

            /* SAM-FIELD: QNAME     SRA-column: SPOT_ID ( int64 ) */
            if ( rc == 0 )
            {
                bool print_just_seq_spot_id = true;
                
                if ( opts->print_spot_group_in_name )
                {
                    const char * spot_group;
                    uint32_t spot_group_len;
                    rc = read_char_ptr( row_id, stx->cursor, stx->spot_group_idx, &spot_group, &spot_group_len, "SPOT_GROUP" );
                    if ( rc == 0 && spot_group_len > 0 )
                    {
                        rc = KOutMsg( "%ld.%.*s\t", row_id, spot_group_len, spot_group );
                        print_just_seq_spot_id = false;
                    }
                }
                if ( print_just_seq_spot_id )
                {
                    rc = KOutMsg( "%ld\t", row_id );
                }
            }
            
            /* SAM-FIELD: FLAG      SRA-column: calculated from READ_TYPE, READ_FILTER etc. */
            if ( rc == 0 )
            {
                uint32_t sam_flags;
                if ( stx->prim_al_id_idx != INVALID_COLUMN )
                {
                    uint32_t temp_nreads = nreads;
                    if ( mate_id == 0 && read_len[ mate_idx ] == 0 ) temp_nreads--;
                    sam_flags = calculate_unaligned_sam_flags_db( temp_nreads, read_idx, mate_idx, 
                                            mate_id, read_type, reverse, read_filter );
                }
                else
                {
                    if ( reverse )
                        sam_flags = ( 0x04 | 0x10 );
                    else
                        sam_flags = 0x04;
                }
                rc = KOutMsg( "%u\t", sam_flags );
            }

            /* SAM-FIELD: RNAME     SRA-column: none, fix '*' */
            /* SAM-FIELD: POS       SRA-column: none, fix '0' */
            /* SAM-FIELD: MAPQ      SRA-column: none, fix '0' */
            /* SAM-FIELD: CIGAR     SRA-column: none, fix '*' */
            if ( rc == 0 )
                rc = KOutMsg( "*\t0\t0\t*\t" );

            /* SAM-FIELD: RNEXT     SRA-column: look up in cache, or none */
            /* SAM-FIELD: POS       SRA-column: look up in cache, or none */
            if ( rc == 0 )
            {
                if ( ptx == NULL )
                {
                    rc = KOutMsg( "0\t0\t" );   /* no way to get that without PRIM_ALIGN-table */
                }
                else
                {
                    if ( opts->use_mate_cache && mc != NULL && ids != NULL )
                    {
                        const char * mate_ref_name;
                        uint32_t mate_ref_name_len;
                        INSDC_coord_zero mate_ref_pos;

                        rc = get_mate_info( ptx, mc, ids, row_id, mate_id, nreads, &mate_ref_name, &mate_ref_name_len, &mate_ref_pos );
                        if ( rc == 0 )
                            rc = KOutMsg( "%.*s\t%li\t", mate_ref_name_len, mate_ref_name, mate_ref_pos );
                    }
                    else
                    {
                        /* print the mate info */
                        rc = dump_the_other_read( stx, ptx, row_id, mate_idx );
                    }
                }
            }


            /* SAM-FIELD: TLEN      SRA-column: none, fix '0' */
            if ( rc == 0 )
                rc = KOutMsg( "0\t" );

            if ( rc == 0 && read == NULL )
                rc = read_INSDC_dna_text_ptr( row_id, stx->cursor, stx->read_idx, &read, &rd_len, "READ" );
            if ( rc == 0 && read_start == NULL )
                rc = read_read_start( stx, row_id, &read_start, nreads );

            /* SAM-FIELD: SEQ       SRA-column: READ, sliced by READ_START/READ_LEN */
            if ( rc == 0 )
                rc = print_sliced_read( read, read_idx, reverse, read_start, read_len );
            if ( rc == 0 )
                rc = KOutMsg( "\t" );

            if ( rc == 0 && quality == NULL )
                rc = read_quality( stx, row_id, &quality, rd_len );

            /* SAM-FIELD: QUAL      SRA-column: QUALITY, sliced by READ_START/READ_LEN */
            if ( rc == 0 )
                rc = print_sliced_quality( opts, quality, read_idx, reverse, read_start, read_len );

            /* OPT SAM-FIIELD:      SRA-column: ALIGN_ID */
            if ( rc == 0 && opts->print_alignment_id_in_column_xi )
                rc = KOutMsg( "\tXI:i:%u", row_id );

            /* OPT SAM-FIIELD:      SRA-column: SPOT_GROUP */
            if ( rc == 0 && stx->spot_group_idx != COL_NOT_AVAILABLE )
                rc = opt_field_spot_group( stx, row_id );

            /* OPT SAM-FIELD:       SRA-column: LINKAGE_GROUP */
            if ( rc == 0 && stx->lnk_group_idx != COL_NOT_AVAILABLE )
                rc = opt_field_lnk_group( stx, row_id );

            if ( rc == 0 )
                rc = KOutMsg( "\n" );
        }
    }
    return rc;
}


/* called if we are dumping from a legacy table instead from a database */
static rc_t dump_seq_row_sam( const samdump_opts * const opts,
                              const seq_table_ctx * const stx,
                              const int64_t row_id,
                              const uint32_t nreads )
{
    uint32_t read_idx, rd_len, name_len;
    const char * quality = NULL;
    const char * name = NULL;
    const INSDC_dna_text * read = NULL;
    const INSDC_read_type * read_type;
    const INSDC_read_filter * read_filter = NULL;
    const INSDC_coord_zero * read_start = NULL;
    const INSDC_coord_len * read_len;

    rc_t rc = read_read_len( stx, row_id, &read_len, nreads );
    if ( rc == 0 )
    {
        if ( stx->name_idx != COL_NOT_AVAILABLE )
            rc = read_char_ptr( row_id, stx->cursor, stx->name_idx, &name, &name_len, "NAME" );
        else
            name_len = 0;
    }
    if ( rc == 0 )
        rc = read_read_type( stx, row_id, &read_type, nreads );

    for ( read_idx = 0; ( read_idx < nreads ) && ( rc == 0 ); ++read_idx )
    {
        if ( ( read_len[ read_idx ] > 0 ) &&             /* has a length! */
             ( ( read_type[ read_idx ] & READ_TYPE_BIOLOGICAL ) == READ_TYPE_BIOLOGICAL ) )
        {
            bool reverse = false;
            uint32_t mate_idx = 0;

            if ( nreads > 1 )
            {
                if ( read_idx == ( nreads - 1 ) )
                    mate_idx = read_idx - 1;
                else
                    mate_idx = read_idx + 1;
            }

            if ( rc == 0 ) /* types in interfaces/insdc/insdc.h */
                reverse = calc_reverse_flag( opts, read_idx, read_type );

            if ( rc == 0 && read_filter == NULL )
                rc = read_read_filter( stx, row_id, &read_filter, nreads );

            /* SAM-FIELD: QNAME     SRA-column: SPOT_ID ( int64 ) */
            if ( rc == 0 )
            {
                bool print_just_seq_spot_id = true;
                
                if ( opts->print_spot_group_in_name )
                {
                    const char * spot_group;
                    uint32_t spot_group_len;
                    rc = read_char_ptr( row_id, stx->cursor, stx->spot_group_idx, &spot_group, &spot_group_len, "SPOT_GROUP" );
                    if ( rc == 0 && spot_group_len > 0 )
                    {
                        if ( name != NULL && name_len > 0 )
                            rc = KOutMsg( "%.*s.%.*s\t", name_len, name, spot_group_len, spot_group );
                        else
                            rc = KOutMsg( "%ld.%.*s\t", row_id, spot_group_len, spot_group );
                        print_just_seq_spot_id = false;
                    }
                }

                if ( print_just_seq_spot_id )
                {
                    if ( name != NULL && name_len > 0 )
                        rc = KOutMsg( "%.*s\t", name_len, name );
                    else
                        rc = KOutMsg( "%lu\t", row_id );
                }
            }

            /* SAM-FIELD: FLAG      SRA-column: calculated from READ_TYPE, READ_FILTER etc. */
            if ( rc == 0 )
            {
                uint32_t sam_flags = calculate_unaligned_sam_flags_db( nreads, read_idx, mate_idx, 
                                            0, read_type, reverse, read_filter );
                rc = KOutMsg( "%u\t", sam_flags );
            }

            /* SAM-FIELD: RNAME     SRA-column: none, fix '*' */
            /* SAM-FIELD: POS       SRA-column: none, fix '0' */
            /* SAM-FIELD: MAPQ      SRA-column: none, fix '0' */
            /* SAM-FIELD: CIGAR     SRA-column: none, fix '*' */
            /* SAM-FIELD: RNEXT     SRA-column: none, fix '*' */
            /* SAM-FIELD: POS       SRA-column: none, fix '0' */
            /* SAM-FIELD: TLEN      SRA-column: none, fix '0' */

            if ( rc == 0 )
                rc = KOutMsg( "*\t0\t0\t*\t*\t0\t0\t" );

            if ( rc == 0 && read == NULL )
                rc = read_INSDC_dna_text_ptr( row_id, stx->cursor, stx->read_idx, &read, &rd_len, "READ" );
            if ( rc == 0 && read_start == NULL )
                rc = read_read_start( stx, row_id, &read_start, nreads );

            /* SAM-FIELD: SEQ       SRA-column: READ, sliced by READ_START/READ_LEN */
            if ( rc == 0 )
                rc = print_sliced_read( read, read_idx, reverse, read_start, read_len );
            if ( rc == 0 )
                rc = KOutMsg( "\t" );

            if ( rc == 0 && quality == NULL )
                rc = read_quality( stx, row_id, &quality, rd_len );

            /* SAM-FIELD: QUAL      SRA-column: QUALITY, sliced by READ_START/READ_LEN */
            if ( rc == 0 )
                rc = print_sliced_quality( opts, quality, read_idx, reverse, read_start, read_len );

            /* OPT SAM-FIIELD:      SRA-column: ALIGN_ID */
            if ( rc == 0 && opts->print_alignment_id_in_column_xi )
                rc = KOutMsg( "\tXI:i:%u", row_id );

            /* OPT SAM-FIIELD:      SRA-column: SPOT_GROUP */
            if ( rc == 0 && stx->spot_group_idx != COL_NOT_AVAILABLE )
                rc = opt_field_spot_group( stx, row_id );

            /* OPT SAM-FIELD:       SRA-column: LINKAGE_GROUP */
            if ( rc == 0 && stx->lnk_group_idx != COL_NOT_AVAILABLE )
                rc = opt_field_lnk_group( stx, row_id );

            if ( rc == 0 )
                rc = KOutMsg( "\n" );
        }
    }
    return rc;
}


static rc_t dump_seq_row_fastx_filtered( const samdump_opts * const opts,
                                         const seq_table_ctx * const stx,
                                         const prim_table_ctx * const ptx,
                                         const matecache * const mc,
                                         const input_database * const ids,
                                         const int64_t row_id,
                                         const uint32_t nreads )
{
    uint32_t read_idx, rd_len, prim_align_ids_len, spot_group_len = 0;
    const int64_t * prim_align_ids;
    const char * quality = NULL;
    const INSDC_dna_text * read = NULL;
    const char * spot_group = NULL;
    const INSDC_read_type * read_type = NULL;
    const INSDC_coord_zero * read_start = NULL;
    const INSDC_coord_len * read_len;

    rc_t rc = read_int64_ptr( row_id, stx->cursor, stx->prim_al_id_idx, &prim_align_ids, &prim_align_ids_len, "PRIM_AL_ID" );
    if ( rc == 0 && nreads != prim_align_ids_len )
        rc = complain_size_diff( row_id, "PRIMARY_ALIGNMENT_ID" );
    if ( rc == 0 )
        rc = read_read_len( stx, row_id, &read_len, nreads );

    for ( read_idx = 0; ( read_idx < nreads ) && ( rc == 0 ); ++read_idx )
    {
        if ( prim_align_ids[ read_idx ] == 0 &&    /* read is NOT aligned! */
             read_len[ read_idx ] > 0 )            /* and has a length! */
        {
            uint32_t mate_idx = calc_mate_idx( nreads, read_idx );
            int64_t align_id = prim_align_ids[ mate_idx ];
            if ( align_id != 0 )
            {
                uint32_t ref_idx;
                INSDC_coord_zero mate_ref_pos;
                int64_t seq_spot_id;
                rc = matecache_lookup_unaligned( mc, ids->db_idx, align_id, &mate_ref_pos, &ref_idx, &seq_spot_id );
                if ( rc == 0 )
                {
                    /* bool reverse; */

                    /* the NAME */
                    if ( opts->output_format == of_fastq )
                        rc = KOutMsg( "@" );
                    else
                        rc = KOutMsg( ">" );

                    if ( rc == 0 )
                    {
                        if ( opts->print_spot_group_in_name && spot_group == NULL )
                            rc = read_char_ptr( row_id, stx->cursor, stx->spot_group_idx, &spot_group, &spot_group_len, "SPOT_GROUP" );
                        if ( rc == 0 )
                            rc = dump_name( opts, seq_spot_id, spot_group, spot_group_len ); /* sam-dump-opts.c */
                        if ( rc == 0 )
                            rc = KOutMsg( "/%u unaligned\n", read_idx + 1 );
                    }

                    if ( rc == 0 && read == NULL )
                        rc = read_INSDC_dna_text_ptr( row_id, stx->cursor, stx->read_idx, &read, &rd_len, "READ" );
                    if ( rc == 0 && quality == NULL )
                        rc = read_quality( stx, row_id, &quality, rd_len );
                    if ( rc == 0 && read_type == NULL )
                        rc = read_read_type( stx, row_id, &read_type, nreads );
                    /*
                    if ( rc == 0 )
                        reverse = ( ( read_type[ read_idx ] & READ_TYPE_REVERSE ) == READ_TYPE_REVERSE );
                    */
                    if ( rc == 0 && read_start == NULL )
                        rc = read_read_start( stx, row_id, &read_start, nreads );

                    /* the READ */
                    if ( rc == 0 )
                        rc = print_sliced_read( read, read_idx, /* reverse */ false, read_start, read_len );
                    if ( rc == 0 )
                        rc = KOutMsg( "\n" );

                    /* in case of fastq : the QUALITY-line */
                    if ( rc == 0 && opts->output_format == of_fastq )
                    {
                        rc = KOutMsg( "+\n" );
                        if ( rc == 0 )
                            rc = print_sliced_quality( opts, quality, read_idx, /* reverse */ false, read_start, read_len );
                        if ( rc == 0 )
                            rc = KOutMsg( "\n" );
                    }
                }
                else
                {
                    rc = 0;
                }
            }
        }
    }
    return rc;
}


static rc_t dump_seq_row_fastx( const samdump_opts * const opts,
                                const seq_table_ctx * const stx,
                                const int64_t row_id,
                                const uint32_t nreads )
{
    uint32_t read_idx, rd_len, prim_align_ids_len, spot_group_len = 0;
    const int64_t * prim_align_ids;
    const char * quality = NULL;
    const INSDC_dna_text * read = NULL ;
    const char * spot_group = NULL;
    const INSDC_read_type * read_type = NULL;
    const INSDC_coord_zero * read_start = NULL;
    const INSDC_coord_len * read_len;

    rc_t rc = read_int64_ptr( row_id, stx->cursor, stx->prim_al_id_idx, &prim_align_ids, &prim_align_ids_len, "PRIM_AL_IDS" );
    if ( rc == 0 && nreads != prim_align_ids_len )
        rc = complain_size_diff( row_id, "PRIMARY_ALIGNMENT_ID" );
    if ( rc == 0 )
        rc = read_read_len( stx, row_id, &read_len, nreads );

    for ( read_idx = 0; ( read_idx < nreads ) && ( rc == 0 ); ++read_idx )
    {
        if ( prim_align_ids[ read_idx ] == 0 &&    /* read is NOT aligned! */
             read_len[ read_idx ] > 0 )            /* and has a length! */
        {
            /* bool reverse; */

            /* the NAME */
            if ( opts->output_format == of_fastq )
                rc = KOutMsg( "@" );
            else
                rc = KOutMsg( ">" );
            if ( rc == 0 )
            {
                if ( opts->print_spot_group_in_name && spot_group == NULL )
                    rc = read_char_ptr( row_id, stx->cursor, stx->spot_group_idx, &spot_group, &spot_group_len, "SPOT_GROUP" );
                if ( rc == 0 )
                    rc = dump_name( opts, row_id, spot_group, spot_group_len ); /* sam-dump-opts.c */
                if ( rc == 0 )
                    rc = KOutMsg( "/%u unaligned\n", read_idx + 1 );
            }

            if ( rc == 0 && read == NULL )
                rc = read_INSDC_dna_text_ptr( row_id, stx->cursor, stx->read_idx, &read, &rd_len, "READ" );
            if ( rc == 0 && quality == NULL )
                rc = read_quality( stx, row_id, &quality, rd_len );
            if ( rc == 0 && read_type == NULL )
                rc = read_read_type( stx, row_id, &read_type, nreads );
            /*
            if ( rc == 0 )
                reverse = ( ( read_type[ read_idx ] & READ_TYPE_REVERSE ) == READ_TYPE_REVERSE );
            */
            if ( rc == 0 && read_start == NULL )
                rc = read_read_start( stx, row_id, &read_start, nreads );

            /* the READ */
            if ( rc == 0 )
                rc = print_sliced_read( read, read_idx, /*reverse*/ false, read_start, read_len );
            if ( rc == 0 )
                rc = KOutMsg( "\n" );

            /* in case of fastq : the QUALITY-line */
            if ( rc == 0 && opts->output_format == of_fastq )
            {
                rc = KOutMsg( "+\n" );
                if ( rc == 0 )
                    rc = print_sliced_quality( opts, quality, read_idx, /*reverse*/ false, read_start, read_len );
                if ( rc == 0 )
                    rc = KOutMsg( "\n" );
            }
        }
    }
    return rc;
}


static rc_t dump_seq_tab_row_fastx( const samdump_opts * const opts,
                                    const seq_table_ctx * const stx,
                                    const int64_t row_id,
                                    const uint32_t nreads )
{
    uint32_t read_idx, rd_len, name_len, spot_group_len = 0;
    const char * quality = NULL;
    const char * name;
    const INSDC_dna_text * read = NULL ;
    const char * spot_group = NULL;
    const INSDC_read_type * read_type;
    const INSDC_coord_zero * read_start = NULL;
    const INSDC_coord_len * read_len;

    rc_t rc = read_read_len( stx, row_id, &read_len, nreads );
    if ( rc == 0 )
        rc = read_char_ptr( row_id, stx->cursor, stx->name_idx, &name, &name_len, "NAME" );
    if ( rc == 0 )
        rc = read_read_type( stx, row_id, &read_type, nreads );

    for ( read_idx = 0; ( read_idx < nreads ) && ( rc == 0 ); ++read_idx )
    {
        if ( ( read_len[ read_idx ] > 0 ) &&            /* has a length! */
             ( ( read_type[ read_idx ] & READ_TYPE_BIOLOGICAL ) == READ_TYPE_BIOLOGICAL ) )
        {
            /* bool reverse; */

            /* the NAME */
            if ( opts->output_format == of_fastq )
                rc = KOutMsg( "@" );
            else
                rc = KOutMsg( ">" );
            if ( rc == 0 )
            {
                if ( opts->print_spot_group_in_name && spot_group == NULL )
                    rc = read_char_ptr( row_id, stx->cursor, stx->spot_group_idx, &spot_group, &spot_group_len, "SPOT_GROUP" );

                if ( rc == 0 )
                    rc = dump_name_legacy( opts, name, name_len, spot_group, spot_group_len ); /* sam-dump-opts.c */

                if ( rc == 0 )
                    rc = KOutMsg( "/%u unaligned\n", read_idx + 1 );
            }

            if ( rc == 0 && read == NULL )
                rc = read_INSDC_dna_text_ptr( row_id, stx->cursor, stx->read_idx, &read, &rd_len, "READ" );
            if ( rc == 0 && quality == NULL )
                rc = read_quality( stx, row_id, &quality, rd_len );
            /*
            if ( rc == 0 )
                reverse = ( ( read_type[ read_idx ] & READ_TYPE_REVERSE ) == READ_TYPE_REVERSE );
            */
            if ( rc == 0 && read_start == NULL )
                rc = read_read_start( stx, row_id, &read_start, nreads );

            /* the READ */
            if ( rc == 0 )
                rc = print_sliced_read( read, read_idx, /* reverse */ false, read_start, read_len );
            if ( rc == 0 )
                rc = KOutMsg( "\n" );

            /* in case of fastq : the QUALITY-line */
            if ( rc == 0 && opts->output_format == of_fastq )
            {
                if ( quality == NULL )
                    rc = read_quality( stx, row_id, &quality, rd_len );
                if ( rc == 0 )
                    rc = KOutMsg( "+\n" );
                if ( rc == 0 )
                    rc = print_sliced_quality( opts, quality, read_idx, /* reverse */ false, read_start, read_len );
                if ( rc == 0 )
                    rc = KOutMsg( "\n" );
            }
        }
    }
    return rc;
}


typedef struct unaligned_callback_ctx
{
    const samdump_opts * opts;
    const input_database * ids;
    const matecache * mc;
    seq_table_ctx * stx;
    prim_table_ctx * ptx;
} unaligned_callback_ctx;


static rc_t CC on_unaligned_seq_id( int64_t seq_id, int64_t al_id, void * user_data )
{
    rc_t rc = Quitting();
    if ( rc == 0 )
    {
        seq_row row;
        unaligned_callback_ctx * u_ctx = user_data;
        rc = read_seq_row( u_ctx->opts, u_ctx->stx, seq_id, &row );
        if ( rc == 0 && !row.filtered_out )
        {
            switch( u_ctx->opts->output_format )
            {
                case of_sam   : rc = dump_seq_row_sam_filtered( u_ctx->opts, u_ctx->stx, u_ctx->ptx, u_ctx->mc, u_ctx->ids, seq_id, row.nreads ); break;
                case of_fasta : /* fall through intended ! */
                case of_fastq : rc = dump_seq_row_fastx_filtered( u_ctx->opts, u_ctx->stx, u_ctx->ptx, u_ctx->mc, u_ctx->ids, seq_id, row.nreads ); break;
            }
        }
    }
    return rc;
}


static rc_t print_unaligned_database_filtered_2( const samdump_opts * const opts,
                                                 const input_table * const seq,
                                                 const input_table * const prim,
                                                 const matecache * const mc,
                                                 const input_database * const ids )
{
    seq_table_ctx stx;
    rc_t rc = prepare_seq_table_ctx( opts, seq, &stx );
    if ( rc == 0 )
    {
        rc = VCursorOpen( stx.cursor );
        if ( rc != 0 )
        {
            (void)PLOGERR( klogInt, ( klogInt, rc, "VCursorOpen( SEQUENCE ) for $(tn) failed", "tn=%s", seq->path ) );
        }
        else
        {
            prim_table_ctx ptx;
            rc = prepare_prim_table_ctx( opts, prim, &ptx );
            if ( rc == 0 )
            {
                unaligned_callback_ctx u_ctx;
                u_ctx.opts = opts;
                u_ctx.ids = ids;
                u_ctx.mc = mc;
                u_ctx.stx = &stx;
                u_ctx.ptx = &ptx;
                rc = foreach_unaligned_entry( mc, ids->db_idx, on_unaligned_seq_id, &u_ctx );
                VCursorRelease( ptx.cursor );
            }
        }
    }
    return rc;
}


/* we are printing from a sra-database, we print half aligned reads only if we find them in the mate-cache */
static rc_t print_unaligned_database_filtered( const samdump_opts * const opts,
                                               const input_table * const seq,
                                               const input_table * const prim,
                                               const matecache * const mc,
                                               const input_database * const ids )
{
    return print_unaligned_database_filtered_2( opts, seq, prim, mc, ids );
#if 0
    seq_table_ctx stx;
    rc_t rc = prepare_seq_table_ctx( opts, seq, &stx );
    if ( rc == 0 )
    {
        rc = VCursorOpen( stx.cursor );
        if ( rc != 0 )
        {
            (void)PLOGERR( klogInt, ( klogInt, rc, "VCursorOpen( SEQUENCE ) for $(tn) failed", "tn=%s", seq->path ) );
        }
        else
        {
            int64_t first_row;
            uint64_t row_count;
            rc = VCursorIdRange( stx.cursor, stx.prim_al_id_idx, &first_row, &row_count );
            if ( rc != 0 )
            {
                (void)PLOGERR( klogInt, ( klogInt, rc, "VCursorIdRange( SEQUENCE ) for $(tn) failed", "tn=%s", seq->path ) );
            }
            else
            {
                prim_table_ctx ptx;
                rc = prepare_prim_table_ctx( opts, prim, &ptx );
                if ( rc == 0 )
                {
                    int64_t row_id;
                    seq_row row;

                    for ( row_id = first_row; ( ( row_id - first_row ) < row_count ) && rc == 0; ++row_id )
                    {
                        rc = Quitting();
                        if ( rc == 0 )
                        {
                            rc = read_seq_row( opts, &stx, row_id, &row );
                            if ( rc == 0 && !row.filtered_out )
                            {
                                switch( opts->output_format )
                                {
                                    case of_sam   : rc = dump_seq_row_sam_filtered( opts, &stx, &ptx, mc, ids, row_id, row.nreads ); break;
                                    case of_fasta : /* fall through intended ! */
                                    case of_fastq : rc = dump_seq_row_fastx_filtered( opts, &stx, &ptx, mc, ids, row_id, row.nreads ); break;
                                }
                            }
                        }
                    }
                    VCursorRelease( ptx.cursor );
                }
            }
        }
        VCursorRelease( stx.cursor );
    }
    return rc;
#endif
}


/* we are printing from a sra-database, we print all unaligned read we can find */
static rc_t print_unaligned_database_full( const samdump_opts * const opts,
                                           const input_table * const seq,
                                           const input_table * const prim,
                                           const matecache * const mc,
                                           const input_database * const ids )
{
    seq_table_ctx stx;
    rc_t rc = prepare_seq_table_ctx( opts, seq, &stx );
    if ( rc == 0 )
    {
        rc = VCursorOpen( stx.cursor );
        if ( rc != 0 )
        {
            (void)PLOGERR( klogInt, ( klogInt, rc, "VCursorOpen( SEQUENCE ) for $(tn) failed", "tn=%s", seq->path ) );
        }
        else
        {
            prim_table_ctx ptx;
            if ( opts->output_format == of_sam )
                rc = prepare_prim_table_ctx( opts, prim, &ptx );
            if ( rc == 0 )
            {
                int64_t first_row, row_id;
                uint64_t row_count;
                rc = VCursorIdRange( stx.cursor, stx.read_type_idx, &first_row, &row_count );
                if ( rc != 0 )
                {
                    (void)PLOGERR( klogInt, ( klogInt, rc, "VCursorIdRange( SEQUENCE ) for $(tn) failed", "tn=%s", seq->path ) );
                }
                else
                {
                    seq_row row;
                    for ( row_id = first_row; ( ( row_id - first_row ) < row_count ) && rc == 0; ++row_id )
                    {
                        rc = Quitting();
                        if ( rc == 0 )
                        {
                            rc = read_seq_row( opts, &stx, row_id, &row );
                            if ( rc == 0 && !row.filtered_out )
                            {
                                switch( opts->output_format )
                                {
                                    case of_sam   : rc = dump_seq_prim_row_sam( opts, &stx, &ptx, mc, ids, row_id, row.nreads ); break;
                                    case of_fasta : /* fall through intended ! */
                                    case of_fastq : rc = dump_seq_row_fastx( opts, &stx, row_id, row.nreads ); break;
                                }
                            }
                        }
                    }
                }
                if ( opts->output_format == of_sam )
                    VCursorRelease( ptx.cursor );
            }
        }
        VCursorRelease( stx.cursor );
    }
    return rc;
}


/* we are printing from a (legacy) table not from a database! */
static rc_t print_unaligned_table( const samdump_opts * const opts,
                                   const input_table * const seq )
{
    seq_table_ctx stx;
    rc_t rc = prepare_seq_table_ctx( opts, seq, &stx );
    if ( rc == 0 )
    {
        rc = VCursorOpen( stx.cursor );
        if ( rc != 0 )
        {
            (void)PLOGERR( klogInt, ( klogInt, rc, "VCursorOpen( SEQUENCE ) for $(tn) failed", "tn=%s", seq->path ) );
        }
        else
        {
            int64_t first_row, row_id;
            uint64_t row_count;
            rc = VCursorIdRange( stx.cursor, stx.read_type_idx, &first_row, &row_count );
            if ( rc != 0 )
            {
                (void)PLOGERR( klogInt, ( klogInt, rc, "VCursorIdRange( SEQUENCE ) for $(tn) failed", "tn=%s", seq->path ) );
            }
            else
            {
                seq_row row;
                for ( row_id = first_row; ( ( row_id - first_row ) < row_count ) && rc == 0; ++row_id )
                {
                    rc = Quitting();
                    if ( rc == 0 )
                    {
                        rc = read_seq_row( opts, &stx, row_id, &row );
                        if ( rc == 0 && !row.filtered_out )
                        {
                            switch( opts->output_format )
                            {
                                case of_sam   : rc = dump_seq_row_sam( opts, &stx, row_id, row.nreads ); break;
                                case of_fasta : /* fall through intended ! */
                                case of_fastq : rc = dump_seq_tab_row_fastx( opts, &stx, row_id, row.nreads ); break;
                            }
                        }
                    }
                }
            }
        }
        VCursorRelease( stx.cursor );
    }
    return rc;
}


/* entry point from sam-dump3.c */
rc_t print_unaligned_spots( const samdump_opts * const opts,
                            const input_files * const ifs,
                            const matecache * const mc )
{
    rc_t rc = 0;

#if _DEBUGGING
    if ( opts->perf_log != NULL )
        perf_log_start_section( opts->perf_log, "unaligned spots" );
#endif

    if ( ( ifs->database_count > 0 ) && ( opts->dump_unaligned_reads || opts->dump_unaligned_only ) )
    {
        uint32_t db_idx;
        for ( db_idx = 0; db_idx < ifs->database_count && rc == 0; ++db_idx )
        {
            const input_database * ids = VectorGet( &ifs->dbs, db_idx );
            if ( ids != NULL )
            {
                input_table seq;

                seq.path = ids->path;
                rc = VDatabaseOpenTableRead( ids->db, &seq.tab, "SEQUENCE" );
                if ( rc != 0 )
                {
                    (void)PLOGERR( klogInt, ( klogInt, rc, "cannot open table SEQUENCE for $(tn)", "tn=%s", ids->path ) );
                }
                else
                {
                    input_table prim;
                    prim.path = ids->path;
                    rc = VDatabaseOpenTableRead( ids->db, &prim.tab, "PRIMARY_ALIGNMENT" );
                    if ( rc != 0 )
                    {
                        (void)PLOGERR( klogInt, ( klogInt, rc, "cannot open table PRIMARY_ALIGNMENT $(tn)", "tn=%s", ids->path ) );
                    }
                    else
                    {
                        if ( opts->region_count > 0 )
                        {
                            rc = print_unaligned_database_filtered( opts, &seq, &prim, mc, ids );
                        }
                        else
                        {
                            rc = print_unaligned_database_full( opts, &seq, &prim, mc, ids );
                        }
                        VTableRelease( prim.tab );
                    }
                    VTableRelease( seq.tab );
                }
            }
        }
    }

    if ( rc == 0 && ifs->table_count > 0 )
    {
        uint32_t tab_idx;
        for ( tab_idx = 0; tab_idx < ifs->table_count && rc == 0; ++tab_idx )
        {
            input_table * itab = VectorGet( &ifs->tabs, tab_idx );
            if ( itab != NULL )
                rc = print_unaligned_table( opts, itab );
        }
    }

#if _DEBUGGING
    if ( opts->perf_log != NULL )
        perf_log_end_section( opts->perf_log );
#endif

    return rc;
}
