/*
 * bibcore.c
 *
 * Copyright (c) Chris Putnam 2005-2018
 *
 * Source code released under the GPL version 2
 *
 */
#include <stdio.h>
#include <stdlib.h>
#include "bibutils.h"

/* internal includes */
#include "reftypes.h"
#include "charsets.h"
#include "str_conv.h"
#include "is_ws.h"

/* illegal modes to pass in, but use internally for consistency */
#define BIBL_INTERNALIN   (BIBL_LASTIN+1)
#define BIBL_INTERNALOUT  (BIBL_LASTOUT+1)

#define debug_set( p ) ( p->verbose > 1 )
#define verbose_set( p ) ( p->verbose )

static void
report_params( FILE *fp, const char *f, param *p )
{
	fprintf( fp, "-------------------params start for %s\n", f );
	fprintf( fp, "\tprogname='%s'\n\n", p->progname );

	fprintf( fp, "\treadformat=%d", p->readformat );
	switch ( p->readformat ) {
		case BIBL_INTERNALIN:   fprintf( fp, " (BIBL_INTERNALIN)\n" );   break;
		case BIBL_MODSIN:       fprintf( fp, " (BIBL_MODSIN)\n" );       break;
		case BIBL_BIBTEXIN:     fprintf( fp, " (BIBL_BIBTEXIN)\n" );     break;
		case BIBL_RISIN:        fprintf( fp, " (BIBL_RISIN)\n" );        break;
		case BIBL_ENDNOTEIN:    fprintf( fp, " (BIBL_ENDNOTEIN)\n" );    break;
		case BIBL_COPACIN:      fprintf( fp, " (BIBL_COPACIN)\n" );      break;
		case BIBL_ISIIN:        fprintf( fp, " (BIBL_ISIIN)\n" );        break;
		case BIBL_MEDLINEIN:    fprintf( fp, " (BIBL_MEDLINEIN)\n" );    break;
		case BIBL_ENDNOTEXMLIN: fprintf( fp, " (BIBL_ENDNOTEXMLIN)\n" ); break;
		case BIBL_BIBLATEXIN:   fprintf( fp, " (BIBL_BIBLATEXIN)\n" );   break;
		case BIBL_EBIIN:        fprintf( fp, " (BIBL_EBIIN)\n" );        break;
		case BIBL_WORDIN:       fprintf( fp, " (BIBL_WORDIN)\n" );       break;
		case BIBL_NBIBIN:       fprintf( fp, " (BIBL_NBIBIN)\n" );       break;
		default:                fprintf( fp, " (Illegal value %d)\n", p->readformat ); break;
	}
	fprintf( fp, "\tcharsetin=%d\n", p->charsetin );
	fprintf( fp, "\tcharsetin_src=%d", p->charsetin_src );
	switch ( p->charsetin_src ) {
		case 0:  fprintf( fp, " (BIBL_SRC_DEFAULT)\n" ); break;
		case 1:  fprintf( fp, " (BIBL_SRC_FILE)\n" );    break;
		case 2:  fprintf( fp, " (BIBL_SRC_USER)\n" );    break;
		default: fprintf( fp, " (Illegal value %d)\n", p->charsetin_src );   break;
	}
	fprintf( fp, "\tutf8in=%d\n", p->utf8in );
	fprintf( fp, "\tlatexin=%d\n", p->latexin );
	fprintf( fp, "\txmlin=%d\n\n", p->xmlin );

	fprintf( fp, "\twriteformat=%d", p->writeformat );
	switch ( p->writeformat ) {
		case BIBL_INTERNALOUT:  fprintf( fp, " (BIBL_INTERNALOUT)\n" );  break;
		case BIBL_MODSOUT:      fprintf( fp, " (BIBL_MODSOUT)\n" );      break;
		case BIBL_BIBTEXOUT:    fprintf( fp, " (BIBL_BIBTEXOUT)\n" );    break;
		case BIBL_RISOUT:       fprintf( fp, " (BIBL_RISOUT)\n" );       break;
		case BIBL_ENDNOTEOUT:   fprintf( fp, " (BIBL_ENDNOTEOUT)\n" );   break;
		case BIBL_ISIOUT:       fprintf( fp, " (BIBL_ISIOUT)\n" );       break;
		case BIBL_WORD2007OUT:  fprintf( fp, " (BIBL_WORD2007OUT)\n" );  break;
		case BIBL_ADSABSOUT:    fprintf( fp, " (BIBL_ADSABSOUT)\n" );    break;
		default:                fprintf( fp, " (Illegal value %d)\n", p->writeformat ); break;
	}
	fprintf( fp, "\tcharsetout=%d\n", p->charsetout );
	fprintf( fp, "\tcharsetout_src=%d", p->charsetout_src );
	switch ( p->charsetout_src ) {
		case 0:  fprintf( fp, " (BIBL_SRC_DEFAULT)\n" ); break;
		case 1:  fprintf( fp, " (BIBL_SRC_FILE)\n" );    break;
		case 2:  fprintf( fp, " (BIBL_SRC_USER)\n" );    break;
		default: fprintf( fp, " (Illegal value %d)\n", p->charsetout_src ); break;
	}
	fprintf( fp, "\tutf8out=%d\n", p->utf8out );
	fprintf( fp, "\tutf8bom=%d\n", p->utf8bom );
	fprintf( fp, "\tlatexout=%d\n", p->latexout );
	fprintf( fp, "\txmlout=%d\n", p->xmlout );
	fprintf( fp, "-------------------params end for %s\n", f );

	fflush( fp );
}

/* bibl_duplicateparams()
 *
 * Returns status of BIBL_OK or BIBL_ERR_MEMERR
 */
static int
bibl_duplicateparams( param *np, param *op )
{
	int status;
	slist_init( &(np->asis) );
	slist_init( &(np->corps) );
	status = slist_copy( &(np->asis), &(op->asis ) );
	if ( status!=SLIST_OK ) return BIBL_ERR_MEMERR;
	status = slist_copy( &(np->corps), &(op->corps ) );
	if ( status!=SLIST_OK ) return BIBL_ERR_MEMERR;
	
	if ( !op->progname ) np->progname = NULL;
	else {
		np->progname = strdup( op->progname );
		if ( !np->progname ) return BIBL_ERR_MEMERR;
	}

	np->readformat = op->readformat;
	np->writeformat = op->writeformat;

	np->charsetin = op->charsetin;
	np->charsetin_src = op->charsetin_src;
	np->utf8in = op->utf8in;
	np->latexin = op->latexin;
	np->xmlin = op->xmlin;

	np->charsetout = op->charsetout;
	np->charsetout_src = op->charsetout_src;
	np->utf8out = op->utf8out;
	np->utf8bom = op->utf8bom;
	np->latexout = op->latexout;
	np->xmlout = op->xmlout;
	np->nosplittitle = op->nosplittitle;

	np->verbose = op->verbose;
	np->format_opts = op->format_opts;
	np->addcount = op->addcount;
	np->output_raw = op->output_raw;
	np->singlerefperfile = op->singlerefperfile;

	np->readf = op->readf;
	np->processf = op->processf;
	np->cleanf = op->cleanf;
	np->typef = op->typef;
	np->convertf = op->convertf;
	np->headerf = op->headerf;
	np->footerf = op->footerf;
	np->writef = op->writef;
	np->all = op->all;
	np->nall = op->nall;

	return BIBL_OK;
}

/* bibl_setreadparams()
 *
 * Returns status of BIBL_OK or BIBL_ERR_MEMERR
 */
static int
bibl_setreadparams( param *np, param *op )
{
	int status;
	status = bibl_duplicateparams( np, op );
	if ( status == BIBL_OK ) {
		np->utf8out        = 1;
		np->charsetout     = BIBL_CHARSET_UNICODE;
		np->charsetout_src = BIBL_SRC_DEFAULT;
		np->xmlout         = BIBL_XMLOUT_FALSE;
		np->latexout       = 0;
		np->writeformat    = BIBL_INTERNALOUT;
	}
	return status;
}

/* bibl_setwriteparams()
 *
 * Returns status of BIBL_OK or BIBL_ERR_MEMERR
 */
static int
bibl_setwriteparams( param *np, param *op )
{
	int status;
	status = bibl_duplicateparams( np, op );
	if ( status == BIBL_OK ) {
		np->xmlin         = 0;
		np->latexin       = 0;
		np->utf8in        = 1;
		np->charsetin     = BIBL_CHARSET_UNICODE;
		np->charsetin_src = BIBL_SRC_DEFAULT;
		np->readformat    = BIBL_INTERNALIN;
	}
	return status;
}

void
bibl_freeparams( param *p )
{
	if ( p ) {
		slist_free( &(p->asis) );
		slist_free( &(p->corps) );
		if ( p->progname ) free( p->progname );
	}
}

int
bibl_readasis( param *p, char *f )
{
	int status;

	if ( !p ) return BIBL_ERR_BADINPUT;
	if ( !f ) return BIBL_ERR_BADINPUT;

	status = slist_fill( &(p->asis), f, 1 );

	if ( status == SLIST_ERR_CANTOPEN ) return BIBL_ERR_CANTOPEN;
	else if ( status == SLIST_ERR_MEMERR ) return BIBL_ERR_MEMERR;
	return BIBL_OK;
}

int
bibl_readcorps( param *p, char *f )
{
	int status;

	if ( !p ) return BIBL_ERR_BADINPUT;
	if ( !f ) return BIBL_ERR_BADINPUT;

	status = slist_fill( &(p->corps), f, 1 );

	if ( status == SLIST_ERR_CANTOPEN ) return BIBL_ERR_CANTOPEN;
	else if ( status == 0 ) return BIBL_ERR_MEMERR;
	return BIBL_OK;
}

/* bibl_addtoasis()
 *
 * Returns BIBL_OK or BIBL_ERR_MEMERR
 */
int
bibl_addtoasis( param *p, char *d )
{
	str *s;

	if ( !p ) return BIBL_ERR_BADINPUT;
	if ( !d ) return BIBL_ERR_BADINPUT;

	s = slist_addc( &(p->asis), d );

	return ( s==NULL )? BIBL_ERR_MEMERR : BIBL_OK;
}

/* bibl_addtocorps()
 *
 * Returns BIBL_OK or BIBL_ERR_MEMERR
 */
int
bibl_addtocorps( param *p, char *d )
{
	str *s;

	if ( !p ) return BIBL_ERR_BADINPUT;
	if ( !d ) return BIBL_ERR_BADINPUT;

	s = slist_addc( &(p->corps), d );

	return ( s==NULL )? BIBL_ERR_MEMERR : BIBL_OK;
}

void
bibl_reporterr( int err )
{
	fprintf( stderr, "Bibutils: " );
	switch( err ) {
		case BIBL_OK:
			fprintf( stderr, "No error." ); break;
		case BIBL_ERR_BADINPUT:
			fprintf( stderr, "Bad input." ); break;
		case BIBL_ERR_MEMERR:
			fprintf( stderr, "Memory error." ); break;
		case BIBL_ERR_CANTOPEN:
			fprintf( stderr, "Can't open." ); break;
		default:
			fprintf( stderr, "Cannot identify error code %d.", err ); break;
	}
	fprintf( stderr, "\n" );
}

static int
bibl_illegalinmode( int mode )
{
	if ( mode < BIBL_FIRSTIN || mode > BIBL_LASTIN ) return 1;
	else return 0;
}

static int
bibl_illegaloutmode( int mode )
{
	if ( mode < BIBL_FIRSTOUT || mode > BIBL_LASTOUT ) return 1;
	else return 0;
}

static void
bibl_verbose2( fields *f, char *filename, long nrefs )
{
	int i, n;
	n = fields_num( f );
	fprintf( stderr, "======== %s %ld : converted\n", filename, nrefs );
	for ( i=0; i<n; ++i ) {
		fprintf( stderr, "'%s'='%s' level=%d\n",
			(char*) fields_tag( f, i, FIELDS_CHRP_NOUSE ),
			(char*) fields_value( f, i, FIELDS_CHRP_NOUSE ),
			fields_level( f, i ) );
	}
	fprintf( stderr, "\n" );
	fflush( stderr );
}

#if 0
static void
bibl_verbose1( fields *f, fields *orig, char *filename, long nrefs )
{
	int i, n;
	n = fields_num( orig );
	fprintf( stderr, "======== %s %ld : processed\n", filename, nrefs );
	for ( i=0; i<n; ++i ) {
		fprintf( stderr, "'%s'='%s' level=%d\n",
			(char*) fields_tag( orig, i, FIELDS_CHRP_NOUSE ),
			(char*) fields_value( orig, i, FIELDS_CHRP_NOUSE ),
			fields_level( orig, i ) );
	}
	if ( f ) bibl_verbose2( f, filename, nrefs );
}
#endif

static void
bibl_verbose0( bibl *bin )
{
	int i;
	for ( i=0; i<bin->nrefs; ++i )
		bibl_verbose2( bin->ref[i], "", i+1 );
}

/* extract_tag_value
 *
 * Extract the tag and the value for ALWAYS/DEFAULT
 * entries like: "GENRE:BIBUTILS|Masters thesis"
 *
 * tag = "GENRE:BIBUTILS"
 * value = "Masters thesis"
 */
static int
extract_tag_value( str *tag, str *value, char *p )
{
	str_empty( tag );
	while ( p && *p && *p!='|' ) {
		str_addchar( tag, *p );
		p++;
	}
	if ( str_memerr( tag ) ) return BIBL_ERR_MEMERR;

	if ( p && *p=='|' ) p++;

	str_empty( value );
	while ( p && *p ) {
		str_addchar( value, *p );
		p++;
	}
	if ( str_memerr( tag ) ) return BIBL_ERR_MEMERR;

	return BIBL_OK;
}

/* process_defaultadd()
 *
 * Add tag/value pairs that have "DEFAULT" processing
 * unless a tag/value pair with the same tag has already
 * been adding during reference processing.
 */
static int
process_defaultadd( fields *f, int reftype, param *r )
{
	int i, n, process, level, status, ret = BIBL_OK;
	str tag, value;
	char *p;

	strs_init( &tag, &value, NULL );

	for ( i=0; i<r->all[reftype].ntags; ++i ) {

		process = ((r->all[reftype]).tags[i]).processingtype;
		if ( process!=DEFAULT ) continue;

		level   = ((r->all[reftype]).tags[i]).level;
		p       = ((r->all[reftype]).tags[i]).newstr;

		status = extract_tag_value( &tag, &value, p );
		if ( status!=BIBL_OK ) {
			ret = status;
			goto out;
		}

		n = fields_find( f, tag.data, level );
		if ( n==FIELDS_NOTFOUND ) {
			status = fields_add( f, tag.data, value.data, level );
			if ( status!=FIELDS_OK ) {
				ret = BIBL_ERR_MEMERR;
				goto out;
			}
		}

	}
out:
	strs_free( &tag, &value, NULL );

	return ret;
}

/* process_alwaysadd()
 *
 * Add tag/value pair to reference from the ALWAYS 
 * processing type without exception (the difference from
 * DEFAULT processing).
 */
static int
process_alwaysadd( fields *f, int reftype, param *r )
{
	int i, process, level, status, ret = BIBL_OK;
	str tag, value;
	char *p;

	strs_init( &tag, &value, NULL );

	for ( i=0; i<r->all[reftype].ntags; ++i ) {

		process = ((r->all[reftype]).tags[i]).processingtype;
		if ( process!=ALWAYS ) continue;

		level   = ((r->all[reftype]).tags[i]).level;
		p       = ((r->all[reftype]).tags[i]).newstr;

		status = extract_tag_value( &tag, &value, p );
		if ( status!=BIBL_OK ) {
			ret = status;
			goto out;
		}

		status = fields_add( f, tag.data, value.data, level );
		if ( status!=FIELDS_OK ) {
			ret = BIBL_ERR_MEMERR;
			goto out;
		}
	}

out:
	strs_free( &tag, &value, NULL );

	return ret;
}

static int
read_ref( FILE *fp, bibl *bin, char *filename, param *p )
{
	int nrefs = 0, bufpos = 0, ok, ret=BIBL_OK, fcharset;/* = CHARSET_UNKNOWN;*/
	str reference, line;
	char buf[256]="";
	fields *ref;
	str_init( &reference );
	str_init( &line );
	while ( p->readf( fp, buf, sizeof(buf), &bufpos, &line, &reference, &fcharset ) ) {
		if ( reference.len==0 ) continue;
		ref = fields_new();
		if ( !ref ) {
			ret = BIBL_ERR_MEMERR;
			bibl_free( bin );
			goto out;
		}
		if ( p->processf( ref, reference.data, filename, nrefs+1, p )){
			ok = bibl_addref( bin, ref );
			if ( !ok ) {
				ret = BIBL_ERR_MEMERR;
				bibl_free( bin );
				fields_delete( ref );
				goto out;
			}
		} else {
			fields_delete( ref );
		}
		str_empty( &reference );
		if ( fcharset!=CHARSET_UNKNOWN ) {
			/* charset from file takes priority over default, but
			 * not user-specified */
			if ( p->charsetin_src!=BIBL_SRC_USER ) {
				p->charsetin_src = BIBL_SRC_FILE;
				p->charsetin = fcharset;
				if ( fcharset!=CHARSET_UNICODE ) p->utf8in = 0;
			}
		}
	}
	if ( p->charsetin==CHARSET_UNICODE ) p->utf8in = 1;
out:
	str_free( &line );
	str_free( &reference );
	return ret;
}

/* Don't manipulate latex for URL's and the like */
static int
bibl_notexify( char *tag )
{
	char *protected[] = { "DOI", "URL", "REFNUM", "FILEATTACH" };
	int i, nprotected = sizeof( protected ) / sizeof( protected[0] );
	for ( i=0; i<nprotected; ++i )
		if ( !strcasecmp( tag, protected[i] ) ) return 1;
	return 0;
}

/* bibl_fixcharsetdata()
 *
 * returns BIBL_OK or BIBL_ERR_MEMERR
 */
static int
bibl_fixcharsetdata( fields *ref, param *p )
{
	str *data;
	char *tag;
	long i, n;
	int ok;

	n = fields_num( ref );

	for ( i=0; i<n; ++i ) {

		tag  = fields_tag( ref, i, FIELDS_CHRP_NOUSE );
		data = fields_value( ref, i, FIELDS_STRP_NOUSE );

		if ( bibl_notexify( tag ) ) {
			ok = str_convert( data,
				p->charsetin,  0, p->utf8in,  p->xmlin,
				p->charsetout, 0, p->utf8out, p->xmlout );
		} else {
			ok = str_convert( data,
				p->charsetin,  p->latexin,  p->utf8in,  p->xmlin,
				p->charsetout, p->latexout, p->utf8out, p->xmlout );
		}

		if ( !ok ) return BIBL_ERR_MEMERR;
	}

	return BIBL_OK;
}

/* bibl_fixcharsets()
 *
 * returns BIBL_OK or BIBL_ERR_MEMERR
 */
static int
bibl_fixcharsets( bibl *b, param *p )
{
	int status = BIBL_OK;
	long i;
	for ( i=0; i<b->nrefs && status==BIBL_OK; ++i )
		status = bibl_fixcharsetdata( b->ref[i], p );
	return status;
}

static int
build_refnum( fields *f, long nrefs, int *n )
{
	char *year, *author, *p, num[512];
	int status, ret = BIBL_OK;
	str refnum;

	*n = -1;

	str_init( &refnum );

	year = fields_findv( f, LEVEL_MAIN, FIELDS_CHRP_NOUSE, "DATE:YEAR" );
	if ( !year )
		year = fields_findv_firstof( f, LEVEL_ANY, FIELDS_CHRP_NOUSE,
			"DATE:YEAR", "PARTDATE:YEAR", NULL );

	author = fields_findv( f, LEVEL_MAIN, FIELDS_CHRP_NOUSE, "AUTHOR" );
	if ( !author )
		author = fields_findv_firstof( f, LEVEL_ANY, FIELDS_CHRP_NOUSE,
			"AUTHOR", "AUTHOR:CORP", "AUTHOR:ASIS", NULL );

	if ( year && author ) {
		p = author;
		while ( *p && *p!='|' )
			str_addchar( &refnum, *p++ );
		p = year;
		while ( *p && *p!=' ' && *p!='\t' )
			str_addchar( &refnum, *p++ );
	} else {
		sprintf( num, "%ld", nrefs );
		str_mergestrs( &refnum, "ref", num, NULL );
	}
	if ( str_memerr( &refnum ) ) {
		ret = BIBL_ERR_MEMERR;
		goto out;
	}

	status = fields_add( f, "REFNUM", refnum.data, LEVEL_MAIN );
	if ( status!=FIELDS_OK ) ret = BIBL_ERR_MEMERR;
	else *n = fields_find( f, "REFNUM", LEVEL_MAIN );

out:
	str_free( &refnum );

	return ret;
}

static int
bibl_checkrefid( bibl *b, param *p )
{
	char buf[512];
	int n, status;
	fields *ref;
	long i;

	for ( i=0; i<b->nrefs; ++i ) {
		ref = b->ref[i];
		n = fields_find( ref, "REFNUM", LEVEL_MAIN );
		if ( n==FIELDS_NOTFOUND ) {
			status = build_refnum( ref, i+1, &n );
			if ( status!=BIBL_OK ) return status;
		}
		if ( p->addcount ) {
			sprintf( buf, "_%ld", i+1 );
			str_strcatc( &(ref->data[n]), buf );
			if ( str_memerr( &(ref->data[n]) ) )
				return BIBL_ERR_MEMERR;
		}
	}

	return BIBL_OK;
}

static int
generate_citekey( fields *f, int nref )
{
	int n1, n2, status, ret;
	char *p, buf[100];
	str citekey;

	str_init( &citekey );

	n1 = fields_find( f, "AUTHOR", LEVEL_MAIN );
	if ( n1==FIELDS_NOTFOUND ) n1 = fields_find( f, "AUTHOR", LEVEL_ANY );
	n2 = fields_find( f, "DATE:YEAR", LEVEL_MAIN );
	if ( n2==FIELDS_NOTFOUND ) n2 = fields_find( f, "DATE:YEAR", LEVEL_ANY );
	if ( n2==FIELDS_NOTFOUND ) n2 = fields_find( f, "PARTDATE:YEAR", LEVEL_MAIN );
	if ( n2==FIELDS_NOTFOUND ) n2 = fields_find( f, "PARTDATE:YEAR", LEVEL_ANY );
	if ( n1!=FIELDS_NOTFOUND && n2!=FIELDS_NOTFOUND ) {
		p = f->data[n1].data;
		while ( p && *p && *p!='|' ) {
			if ( !is_ws( *p ) ) str_addchar( &citekey, *p ); 
			p++;
		}
		p = f->data[n2].data;
		while ( p && *p ) {
			if ( !is_ws( *p ) ) str_addchar( &citekey, *p );
			p++;
		}
		if ( str_memerr( &citekey ) ) {
			ret = -1;
			goto out;
		}
		status = fields_add( f, "REFNUM", citekey.data, 0 );
		if ( status!=FIELDS_OK ) {
			ret = -1;
			goto out;
		}
	} else {
		sprintf( buf, "ref%d\n", nref );
		str_strcpyc( &citekey, buf );
	}
	ret = fields_find( f, "REFNUM", LEVEL_ANY );
out:
	str_free( &citekey );
	return ret;
}

static int
resolve_citekeys( bibl *b, slist *citekeys, int *dup )
{
	const char abc[]="abcdefghijklmnopqrstuvwxyz";
	int nsame, ntmp, n, i, j, status = BIBL_OK;
	str tmp;

	str_init( &tmp );

	for ( i=0; i<citekeys->n; ++i ) {
		if ( dup[i]==-1 ) continue;
		nsame = 0;
		for ( j=i; j<citekeys->n; ++j ) {
			if ( dup[j]!=i ) continue;
			str_strcpy( &tmp, slist_str( citekeys, j ) );
			if ( str_memerr( &tmp ) ) {
				status = BIBL_ERR_MEMERR;
				goto out;
			}
			ntmp = nsame;
			while ( ntmp >= 26 ) {
				str_addchar( &tmp, 'a' );
					ntmp -= 26;
			}
			if ( ntmp<26 && ntmp>=0 )
			str_addchar( &tmp, abc[ntmp] );
			if ( str_memerr( &tmp ) ) {
				status = BIBL_ERR_MEMERR;
				goto out;
			}
			nsame++;
			dup[j] = -1;
			n = fields_find( b->ref[j], "REFNUM", LEVEL_ANY );
			if ( n!=FIELDS_NOTFOUND ) {
				str_strcpy(&((b->ref[j])->data[n]),&tmp);
				if ( str_memerr( &((b->ref[j])->data[n]) ) ) {
					status = BIBL_ERR_MEMERR;
					goto out;
				}
			}
		}
	}
out:
	str_free( &tmp );
	return status;
}

static int
get_citekeys( bibl *b, slist *citekeys )
{
	fields *f;
	int i, n;
	str *s;
	for ( i=0; i<b->nrefs; ++i ) {
		f = b->ref[i];
		n = fields_find( f, "REFNUM", LEVEL_ANY );
		if ( n==FIELDS_NOTFOUND ) n = generate_citekey( f, i );
		if ( n!=FIELDS_NOTFOUND && f->data[n].data ) {
			s = slist_add( citekeys, &(f->data[n]) );
			if ( !s ) return BIBL_ERR_MEMERR;
		} else {
			s = slist_addc( citekeys, "" );
			if ( !s ) return BIBL_ERR_MEMERR;
		}
	}
	return BIBL_OK;
}

static int 
dup_citekeys( bibl *b, slist *citekeys )
{
	int i, j, status = BIBL_OK, *dup, ndup=0;

	dup = ( int * ) malloc( sizeof( int ) * citekeys->n );
	if ( !dup ) return BIBL_ERR_MEMERR;

	for ( i=0; i<citekeys->n; ++i ) dup[i] = -1;
	for ( i=0; i<citekeys->n-1; ++i ) {
		if ( dup[i]!=-1 ) continue;
		for ( j=i+1; j<citekeys->n; ++j ) {
			if ( !strcmp( slist_cstr( citekeys, i ),
			              slist_cstr( citekeys, j ) ) ) {
					dup[i] = i;
					dup[j] = i;
					ndup++;
			}
		}
	}
	if ( ndup ) status = resolve_citekeys( b, citekeys, dup );
	free( dup );
	return status;
}

static int
uniqueify_citekeys( bibl *b )
{
	slist citekeys;
	int status;
	slist_init( &citekeys );
	status = get_citekeys( b, &citekeys );
	if ( status!=BIBL_OK ) goto out;
	status = dup_citekeys( b, &citekeys );
out:
	slist_free( &citekeys );
	return status;
}

static int
clean_ref( bibl *bin, param *p )
{
	if ( p->cleanf ) return p->cleanf( bin, p );
	else return BIBL_OK;
}

static int 
convert_ref( bibl *bin, char *fname, bibl *bout, param *p )
{
	fields *rin, *rout;
	int reftype = 0, ok, status;
	long i;

	for ( i=0; i<bin->nrefs; ++i ) {
		rin = bin->ref[i];
		rout = fields_new();
		if ( !rout ) return BIBL_ERR_MEMERR;
		if ( p->typef ) 
			reftype = p->typef( rin, fname, i+1, p );
		status = p->convertf( rin, rout, reftype, p );
		if ( status!=BIBL_OK ) return status;
		if ( p->all ) {
			status = process_alwaysadd( rout, reftype, p );
			if ( status!=BIBL_OK ) return status;
			status = process_defaultadd( rout, reftype, p );
			if ( status!=BIBL_OK ) return status;
		}
		ok = bibl_addref( bout, rout );
		if ( !ok ) return BIBL_ERR_MEMERR;
	}
	if ( debug_set( p ) ) {
		fflush( stdout );
		fprintf( stderr, "-------------------start for convert_ref\n");
		bibl_verbose0( bout );
		fprintf( stderr, "-------------------end for convert_ref\n" );
		fflush( stderr );
	}
	status = uniqueify_citekeys( bout );
	return status;
}

int
bibl_read( bibl *b, FILE *fp, char *filename, param *p )
{
	int ok, status;
	param lp;
	bibl bin;

	if ( !b )  return BIBL_ERR_BADINPUT;
	if ( !fp ) return BIBL_ERR_BADINPUT;
	if ( !p )  return BIBL_ERR_BADINPUT;

	if ( bibl_illegalinmode( p->readformat ) ) {
		if ( debug_set( p ) ) {
			fflush( stdout );
			report_params( stderr, "bibl_read", p );
		}
		return BIBL_ERR_BADINPUT;
	}

	status = bibl_setreadparams( &lp, p );
	if ( status!=BIBL_OK ) {
		if ( debug_set( p ) ) {
			fflush( stdout );
			report_params( stderr, "bibl_read", p );
		}
		return status;
	}

	bibl_init( &bin );

	status = read_ref( fp, &bin, filename, &lp );
	if ( status!=BIBL_OK ) {
		if ( debug_set( p ) ) {
			fflush( stdout );
			report_params( stderr, "bibl_read", &lp );
		}
		bibl_freeparams( &lp );
		return status;
	}

	if ( debug_set( p ) ) {
		fflush( stdout );
		report_params( stderr, "bibl_read", &lp );
		fprintf( stderr, "-------------------raw_input start for bibl_read\n");
		bibl_verbose0( &bin );
		fprintf( stderr, "-------------------raw_input end for bibl_read\n" );
		fflush( stderr );
	}

	if ( !lp.output_raw || ( lp.output_raw & BIBL_RAW_WITHCHARCONVERT ) ) {
		status = bibl_fixcharsets( &bin, &lp );
		if ( status!=BIBL_OK ) return status;
		if ( debug_set( p ) ) {
			fprintf( stderr, "-------------------post_fixcharsets start for bibl_read\n");
			bibl_verbose0( &bin );
			fprintf( stderr, "-------------------post_fixcharsets end for bibl_read\n" );
			fflush( stderr );
		}
	}
	if ( !lp.output_raw ) {
		status = clean_ref( &bin, &lp );
		if ( status!=BIBL_OK ) return status;
		if ( debug_set( p ) ) {
			fprintf( stderr, "-------------------post_clean_ref start for bibl_read\n");
			bibl_verbose0( &bin );
			fprintf( stderr, "-------------------post_clean_ref end for bibl_read\n" );
			fflush( stderr );
		}
		ok = convert_ref( &bin, filename, b, &lp );
		if ( ok!=BIBL_OK ) return ok;
		if ( debug_set( p ) ) {
			fprintf( stderr, "-------------------post_convert_ref start for bibl_read\n");
			bibl_verbose0( &bin );
			fprintf( stderr, "-------------------post_convert_ref end for bibl_read\n" );
			fflush( stderr );
		}
	} else {
		if ( debug_set( p ) ) {
			fprintf( stderr, "-------------------here1 start for bibl_read\n");
			bibl_verbose0( &bin );
			fprintf( stderr, "-------------------here1 end for bibl_read\n" );
			fflush( stderr );
		}
		ok = bibl_copy( b, &bin );
		if ( !ok ) {
			bibl_freeparams( &lp );
			return BIBL_ERR_MEMERR;
		}
	}
	if ( !lp.output_raw || ( lp.output_raw & BIBL_RAW_WITHMAKEREFID ) )
		bibl_checkrefid( b, &lp );

	bibl_free( &bin );

	bibl_freeparams( &lp );

	return BIBL_OK;
}

static FILE *
singlerefname( fields *reffields, long nref, int mode )
{
	char outfile[2048];
	char suffix[5] = "xml";
	FILE *fp;
	long count;
	int  found;
	if      ( mode==BIBL_ADSABSOUT )     strcpy( suffix, "ads" );
	else if ( mode==BIBL_BIBTEXOUT )     strcpy( suffix, "bib" );
	else if ( mode==BIBL_ENDNOTEOUT )    strcpy( suffix, "end" );
	else if ( mode==BIBL_ISIOUT )        strcpy( suffix, "isi" );
	else if ( mode==BIBL_MODSOUT )       strcpy( suffix, "xml" );
	else if ( mode==BIBL_RISOUT )        strcpy( suffix, "ris" );
	else if ( mode==BIBL_WORD2007OUT )   strcpy( suffix, "xml" );
	found = fields_find( reffields, "REFNUM", LEVEL_MAIN );
	/* find new filename based on reference */
	if ( found!=-1 ) {
		sprintf( outfile,"%s.%s",reffields->data[found].data, suffix );
	} else  sprintf( outfile,"%ld.%s",nref, suffix );
	count = 0;
	fp = fopen( outfile, "r" );
	while ( fp ) {
		fclose(fp);
		count++;
		if ( count==60000 ) return NULL;
		if ( found!=-1 )
			sprintf( outfile, "%s_%ld.%s", 
				reffields->data[found].data, count, suffix  );
		else sprintf( outfile,"%ld_%ld.%s",nref, count, suffix );
		fp = fopen( outfile, "r" );
	}
	return fopen( outfile, "w" );
}

static int
bibl_writeeachfp( FILE *fp, bibl *b, param *p )
{
	int status;
	long i;
	for ( i=0; i<b->nrefs; ++i ) {
		fp = singlerefname( b->ref[i], i, p->writeformat );
		if ( !fp ) return BIBL_ERR_CANTOPEN;
		if ( p->headerf ) p->headerf( fp, p );
		status = p->writef( b->ref[i], fp, p, i );
		if ( p->footerf ) p->footerf( fp );
		fclose( fp );
		if ( status!=BIBL_OK ) return status;
	}
	return BIBL_OK;
}

static int
bibl_writefp( FILE *fp, bibl *b, param *p )
{
	int status = BIBL_OK;
	long i;
	if ( p->headerf ) p->headerf( fp, p );
	for ( i=0; i<b->nrefs; ++i ) {
		status = p->writef( b->ref[i], fp, p, i );
		if ( status!=BIBL_OK ) break;
	}
	if ( p->footerf ) p->footerf( fp );
	return status;
}

int
bibl_write( bibl *b, FILE *fp, param *p )
{
	int status;
	param lp;

	if ( !b ) return BIBL_ERR_BADINPUT;
	if ( !p ) return BIBL_ERR_BADINPUT;
	if ( bibl_illegaloutmode( p->writeformat ) ) return BIBL_ERR_BADINPUT;
	if ( !fp && !p->singlerefperfile ) return BIBL_ERR_BADINPUT;

	status = bibl_setwriteparams( &lp, p );
	if ( status!=BIBL_OK ) return status;

	status = bibl_fixcharsets( b, &lp );
	if ( status!=BIBL_OK ) return status;

	if ( debug_set( p ) ) {
		report_params( stderr, "bibl_write", &lp );
		fflush( stdout );
		fprintf( stderr, "-------------------start for bibl_write\n");
		bibl_verbose0( b );
		fprintf( stderr, "-------------------end for bibl_write\n" );
		fflush( stderr );
	}

	if ( p->singlerefperfile ) status = bibl_writeeachfp( fp, b, &lp );
	else status = bibl_writefp( fp, b, &lp );

	bibl_freeparams( &lp );

	return status;
}