/*===========================================================================
*
*                            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 <vdb/extern.h>

#include <sra/sradb.h>
#include <vdb/xform.h>
#include <klib/data-buffer.h>
#include <klib/text.h>
#include <klib/rc.h>
#include <sysalloc.h>

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <assert.h>

#include "name-tokenizer.h"

static
rc_t CC tokenize_spot_name_ABI ( void *self, const VXformInfo *info, int64_t row_id,
                              VRowResult *rslt, uint32_t argc, const VRowData argv [] )
{
    rc_t rc;
    const char *name, *end;
    spot_name_token_t *spot_name_tok;
    const int EXPECTED_NUMBER_OF_TOKENS = 3;
    int tok = EXPECTED_NUMBER_OF_TOKENS;
    const uint16_t types[3] = {nt_T, nt_X, nt_Y};
    
    assert(rslt->elem_bits == sizeof(spot_name_tok[0]) * 8);
    rslt->data->elem_bits = sizeof(spot_name_tok[0]) * 8;
    if( (rc = KDataBufferResize(rslt->data, EXPECTED_NUMBER_OF_TOKENS)) != 0 ) {
        return rc;
    }
    
    spot_name_tok = rslt->data->base;
    
    /* reverse line parse by format:
     Dig is -> [-+0-9]
       /^(.*+)(Dig+)!Dig+(Dig+)!Dig+(Dig+)$/ = (run_name, panel, x, y) = ($1, $2, $3, $4)
    */
#define is_signum(a) (isdigit(a) || a == '-' || a == '+')

    name = &((const char *)argv[0].u.data.base)[argv[0].u.data.first_elem];
    end = name + argv[0].u.data.elem_count;
    while(rc == 0 && end > name && tok > 0) {
        const char* c, *last_end;
        do {
            last_end = end--;
        } while( tok != EXPECTED_NUMBER_OF_TOKENS && end != name && !is_signum(*end) );
        while( end != name && is_signum(*end) ) {
            end--;
        }
        c = end;
        if( !is_signum(*c) ) {
            c++;
        }
        if( c >= last_end ) {
            /* empty token */
            break;
        } else if( *c == '-' ) {
            /* keep explicit - '-000' */
            if( last_end - c >= 2 && *(c + 1) == '0' ) {
                c++;
                while( *c == '0' && (c + 1) < last_end ) { c++; }
                if( *c != '0' ) {
                    /* cannot tokenize -0004 */
                    break;
                }
            }
        } else {
            if( *c == '+' ) {
                /* keep explicit + */
                c++;
            }
            /* keep leading zeroes */
            while(*c == '0' && (c + 1) < last_end ) { c++; }
        }
        tok--;
        spot_name_tok[tok].s.token_type = types[tok];
        spot_name_tok[tok].s.position = c - name;
        spot_name_tok[tok].s.length = last_end - c;
        if( spot_name_tok[tok].s.length == 0 ) {
            rc = RC(rcSRA, rcFormatter, rcReading, rcName, rcInvalid);
        }
        while(rc == 0 && c < last_end) {
            if( *c < '0' || *c > '9' ) {
                rc = RC(rcSRA, rcFormatter, rcReading, rcId, rcOutofrange);
            }
            c++;
        }
    }
    if( rc == 0 && tok != 0 ) {
        rc = RC(rcSRA, rcFormatter, rcReading, rcName, rcInvalid);
    }
    if( rc != 0 ) {
        spot_name_tok[0].s.token_type = nt_unrecognized;
        spot_name_tok[0].s.position = 0;
        spot_name_tok[0].s.length = argv[0].u.data.elem_count;
        rslt->elem_count = 1;
    } else {
        rslt->elem_count = EXPECTED_NUMBER_OF_TOKENS;
    }
    return 0;
}

/* tokenize_spot_name
 *  scans name on input
 *  tokenizes into parts

 extern function NCBI:SRA:spot_name_token
    NCBI:SRA:ABI:tokenize_spot_name #1 ( ascii name );
 */
VTRANSFACT_IMPL ( NCBI_SRA_ABI_tokenize_spot_name, 1, 0, 0 ) ( const void *self,
                  const VXfactInfo *info, VFuncDesc *rslt, const VFactoryParams *cp, const VFunctionParams *dp )
{
    rslt->variant = vftRow;
    rslt->u.rf = tokenize_spot_name_ABI;
    
    return 0;
}
