/* copyg.c version 2.1; B D McKay, Jun 2015 */

#define USAGE "copyg [-gszfp#:#qhx] [infile [outfile]]"

#define HELPTEXT \
"  Copy a file of graphs with possible format conversion.\n\
\n\
     -g  Use graph6 format for output\n\
     -s  Use sparse6 format for output\n\
     -z  Use digraph6 format for output\n\
     -i  Use incremental sparse6 format for output\n\
     In the absence of -g, -s, -z or -i, the format\n\
     depends on the header or, if none, the first input line.\n\
     As an exception, digraphs are always written in digraph6.\n\
\n\
     -p# -p#:#  \n\
     Specify range of input lines (first is 1)\n\
     This can fail if the input has incremental lines.\n\
     -f  With -p, assume input lines of fixed length\n\
      (ignored if header or first line has sparse6 format).\n\
     -I# Have at most this number of incremental steps\n\
      in a row.  Implies -i. \n\
\n\
     -h  Write a header.\n\
     -x  Don't write a header.\n\
     In the absence of -h and -x, a header is written if\n\
     there is one in the input.\n\
\n\
     -q  Suppress auxiliary output.\n"

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

#include "gtools.h"

int
main(int argc, char *argv[])
{
    graph *g,*gprev,*gbase;
    int m,n,codetype;
    char *infilename,*outfilename;
    FILE *infile,*outfile;
    int outcode;
    nauty_counter nin;
    int argnum,j,nprev,mprev;
    char *arg,sw;
    boolean sswitch,fswitch,pswitch,qswitch,gswitch;
    boolean hswitch,xswitch,iswitch,Iswitch,zswitch;
    boolean badargs,digraph;
    long pval1,pval2,maxin,refresh,inclines;

    HELP; PUTVERSION;

    iswitch = Iswitch = sswitch = fswitch = pswitch = FALSE;
    gswitch = qswitch = xswitch = hswitch = zswitch = FALSE;
    infilename = outfilename = NULL;

    argnum = 0;
    badargs = FALSE;
    for (j = 1; !badargs && j < argc; ++j)
    {
        arg = argv[j];
        if (arg[0] == '-' && arg[1] != '\0')
        {
            ++arg;
            while (*arg != '\0')
            {
                sw = *arg++;
                     SWBOOLEAN('s',sswitch)
                else SWBOOLEAN('g',gswitch)
                else SWBOOLEAN('z',zswitch)
                else SWBOOLEAN('q',qswitch)
                else SWBOOLEAN('f',fswitch)
                else SWBOOLEAN('h',hswitch)
                else SWBOOLEAN('i',iswitch)
                else SWBOOLEAN('x',xswitch)
                else SWLONG('I',Iswitch,refresh,"copyg -I")
                else SWRANGE('p',":-",pswitch,pval1,pval2,"copyg -p")
                else badargs = TRUE;
            }
        }
        else
        {
            ++argnum;
            if      (argnum == 1) infilename = arg;
            else if (argnum == 2) outfilename = arg;
            else                  badargs = TRUE;
        }
    }

    if (Iswitch) iswitch = TRUE;
    if ((sswitch!=0) + (gswitch!=0) + (iswitch!=0) + (zswitch!=0) > 1) 
        gt_abort(">E copyg: -s, -g, -z and -i/-I are incompatible\n");
    if (hswitch && xswitch) 
        gt_abort(">E copyg: -h and -x are incompatible\n");

    if (badargs || argnum > 2)
    {
        fprintf(stderr,">E Usage: %s\n",USAGE);
        GETHELP;
        exit(1);
    }

    if (!qswitch)
    {
        fprintf(stderr,">A copyg");
        if (sswitch || gswitch || iswitch || Iswitch || fswitch
                        || zswitch || pswitch || xswitch || hswitch)
            fprintf(stderr," -");
        if (sswitch) fprintf(stderr,"s");
        if (gswitch) fprintf(stderr,"g");
        if (zswitch) fprintf(stderr,"z");
        if (hswitch) fprintf(stderr,"h");
        if (Iswitch) fprintf(stderr,"I%ld",refresh); 
        else if (iswitch) fprintf(stderr,"i");
        if (xswitch) fprintf(stderr,"x");
        if (fswitch) fprintf(stderr,"f");
        if (pswitch) writerange(stderr,'p',pval1,pval2);
        if (argnum > 0) fprintf(stderr," %s",infilename);
        if (argnum > 1) fprintf(stderr," %s",outfilename);
        fprintf(stderr,"\n");
        fflush(stderr);
    }

    if (infilename && infilename[0] == '-') infilename = NULL;
    infile = opengraphfile(infilename,&codetype,fswitch,
                                        pswitch ? pval1 : 1);
    if (!infile) exit(1);
    if (!infilename) infilename = "stdin";

    if (!outfilename || outfilename[0] == '-')
    {
        outfilename = "stdout";
        outfile = stdout;
    }
    else if ((outfile = fopen(outfilename,"w")) == NULL)
    {
        fprintf(stderr,"Can't open output file %s\n",outfilename);
        gt_abort(NULL);
    }

    if (gswitch)                  outcode = GRAPH6;
    else if (sswitch || iswitch)  outcode = SPARSE6;
    else if (zswitch)             outcode = DIGRAPH6;
    else if ((codetype&GRAPH6))   outcode = GRAPH6;
    else if ((codetype&SPARSE6))  outcode = SPARSE6;
    else if ((codetype&DIGRAPH6)) outcode = DIGRAPH6;
    else
    {
        outcode = GRAPH6;
        fprintf(stderr,
             ">W copyg doesn't handle this graph format, writing graph6.\n");
    }

    if (hswitch || (!xswitch && (codetype&HAS_HEADER)))
    {
        if (outcode == SPARSE6)       writeline(outfile,SPARSE6_HEADER);
        else if (outcode == DIGRAPH6) writeline(outfile,DIGRAPH6_HEADER);
        else                          writeline(outfile,GRAPH6_HEADER);
    }

    nin = 0;
    if (!pswitch || pval2 == NOLIMIT) maxin = NOLIMIT;
    else if (pval1 < 1) maxin = pval2;
    else                maxin = pval2 - pval1 + 1;

    gprev = NULL;
    nprev = mprev = 1;
    inclines = 0;
    while (nin < maxin || maxin == NOLIMIT)
    {
        if ((g = readgg_inc(infile,NULL,0,&m,&n,gprev,mprev,nprev,&digraph))
                                                      == NULL) break;
        ++nin;

        if (iswitch)  
        {
	    if (digraph) gt_abort(
                ">Z incremental sparse6 is incompatible with digraphs\n");
            gbase = gprev;
            if (nprev != n || mprev != m) gbase = NULL;
            if (Iswitch > 0 && inclines == refresh) gbase = NULL;
            if (gbase == NULL) inclines = 0; else ++inclines;
            writeis6(outfile,g,gbase,m,n);
        }
        else if (outcode == readg_code)   writelast(outfile);
	else if (digraph)             writed6(outfile,g,m,n);
        else if (outcode == SPARSE6)  writes6(outfile,g,m,n);
        else if (outcode == DIGRAPH6) writed6(outfile,g,m,n);
        else                          writeg6(outfile,g,m,n);

        if (gprev) FREES(gprev);
        gprev = g;
        nprev = n;
        mprev = m;
    }

    if (!qswitch) 
        fprintf(stderr,">Z  " COUNTER_FMT " graphs copied from %s to %s\n",
                       nin,infilename,outfilename);

    exit(0);
}