/**
 * @file
 * @brief main of lefty
 */

/*************************************************************************
 * Copyright (c) 2011 AT&T Intellectual Property 
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors: Details at https://graphviz.org
 *************************************************************************/

/* Lefteris Koutsofios - AT&T Labs Research */

#include "config.h"

#define LEFTYVERSION "10 Mar 2005"

#include "builddate.h"
#include <cgraph/exit.h>
#include "common.h"
#include "g.h"
#include "code.h"
#include "leftyio.h"
#include "mem.h"
#include "tbl.h"
#include "parse.h"
#include "exec.h"
#include "str.h"
#include "display.h"
#include "internal.h"
#include "txtview.h"
#include "gfxview.h"

#ifdef FEATURE_GMAP
#include "gmap.h"
#include "gmap2l.h"
#endif

#include <stdbool.h>
#ifndef FEATURE_MS
#include <sys/time.h>
#  ifdef STATS
#  include <sys/resource.h>
#  endif
#endif

#if defined(HAVE_FILE_CNT) && HAVE_FILE_CNT
#define canread(f) ((f)->_cnt>0)
#else
#  if defined(HAVE_FILE_NEXT) && HAVE_FILE_NEXT
#  define canread(f) ((f)->_next<(f)->_endb)
#  else
#    if defined(HAVE_FILE_IO_READ_END) && HAVE_FILE_IO_READ_END
#    define canread(f) ((f)->_IO_read_end>(f)->_IO_read_ptr)
#    else
#      if defined(HAVE_FILE_R) && HAVE_FILE_R
#      define canread(f) ((f)->_r>0)
#      else
#      define canread(f) (1)
#      endif
#    endif
#  endif
#endif

#ifdef FEATURE_GMAP
static bool gmapon;
#endif

static Grect_t txtcoords = {
    { 1,  1 }, { 449, 599 },
};

#ifdef STATS
static time_t stime;
#endif

static int endflag = FALSE;

static char *exprstr;
static FILE *fp;

static int processinput (int);
static void processargs (int, char **);
static void processstr (char *);
static void printusage (void);

#if defined(FEATURE_X11) || defined(FEATURE_NONE)

int main (int argc, char **argv) {
    Tobj co;
    Psrc_t src;

#ifdef MTRACE
    extern int Mt_certify;
    Mt_certify = 1;
#endif
#ifdef STATS
    stime = time (NULL);
#endif

    idlerunmode = 0;
    exprstr = NULL;
    fp = NULL;
    init (argv[0]);

    processstr (leftyoptions);
    argv++, argc--;
    processargs (argc, argv);

    Minit (GFXprune);
    Ginit ();
    FD_SET (Gxfd, &inputfds);

    Eerrlevel = 1;
    Estackdepth = 2;
    Eshowbody = 1;

    if (setjmp (exitljbuf))
        goto eop;

    Cinit ();
    IOinit ();
    Tinit ();
    Pinit ();
    Einit ();
    Sinit ();
    Dinit ();
    Iinit ();
    TXTinit (txtcoords);
    GFXinit ();
#ifdef FEATURE_GMAP
    gmapon = true, G2Linit ();
#endif

    if (exprstr) {
        src.flag = CHARSRC, src.s = exprstr, src.fp = NULL;
        src.tok = -1, src.lnum = 1;
        while ((co = Punit (&src)))
            Eunit (co);
    }
    if (fp) {
        src.flag = FILESRC, src.s = NULL, src.fp = fp;
        src.tok = -1, src.lnum = 1;
        while ((co = Punit (&src)))
            Eunit (co);
    }
    if (endflag)
        goto eop;

    TXTupdate ();

    Gneedredraw = FALSE;
    for (;;) {
        if (Gneedredraw)
            GFXredraw (), Gneedredraw = FALSE;
        if (Gbuttonsdown > 0) {
            GFXmove (), Gprocessevents (FALSE, G_ONEEVENT);
            processinput (FALSE);
        } else {
            if (Mcouldgc) {
                if (!processinput (FALSE))
                    Mdogc (M_GCINCR);
            }
            if (idlerunmode) {
                if (!processinput (FALSE))
                    GFXidle ();
#ifdef FEATURE_GMAP
            } else if (GMAPneedupdate) {
                processinput (FALSE);
#endif
            } else
                processinput (TRUE);
        }
#ifdef FEATURE_GMAP
        if (gmapon)
            GMAPupdate ();
#endif
        if (Erun)
            TXTupdate (), Erun = false;
    }
eop:
#ifdef PARANOID
#ifdef FEATURE_GMAP
    if (gmapon)
        G2Lterm ();
#endif
    GFXterm ();
    TXTterm ();
    Iterm ();
    Dterm ();
    Sterm ();
    Eterm ();
    Pterm ();
    Tterm ();
    IOterm ();
    Cterm ();
    Gterm ();
    Mterm ();
    FD_CLR (Gxfd, &inputfds);
    term ();
#endif
    printusage ();
    graphviz_exit(0);
}

#else

HINSTANCE hinstance, hprevinstance;

int APIENTRY WinMain (
    HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow
) {
    Tobj co;
    Psrc_t src;
    int argc;
    LPWSTR *argv;

    hinstance = hInstance;
    hprevinstance = hPrevInstance;
    idlerunmode = 0;
    exprstr = NULL;
    fp = NULL;
    init (NULL);
    Ginit ();
#ifndef FEATURE_MS
    FD_SET (Gxfd, &inputfds);
#endif

    Eerrlevel = 1;
    Estackdepth = 2;
    Eshowbody = 1;

    processstr (leftyoptions);
    argv = CommandLineToArgvW(lpCmdLine, &argc);
    if (argv == NULL)
      graphviz_exit(EXIT_FAILURE);
    processargs(argc, argv);
    LocalFree(argv);

    if (setjmp (exitljbuf))
        goto eop;

    Cinit ();
    IOinit ();
    Minit (GFXprune);
    Tinit ();
    Pinit ();
    Einit ();
    Sinit ();
    Dinit ();
    Iinit ();
    TXTinit (txtcoords);
    GFXinit ();

    if (exprstr) {
        src.flag = CHARSRC, src.s = exprstr, src.fp = NULL;
        src.tok = -1, src.lnum = 1;
        while ((co = Punit (&src)))
            Eunit (co);
    }
    if (fp) {
        src.flag = FILESRC, src.s = NULL, src.fp = fp;
        src.tok = -1, src.lnum = 1;
        while ((co = Punit (&src)))
            Eunit (co);
    }
    if (endflag)
        goto eop;

    TXTupdate ();

    Gneedredraw = FALSE;
    for (;;) {
        if (Gneedredraw)
            GFXredraw (), Gneedredraw = FALSE;
        if (Gbuttonsdown > 0)
            GFXmove (), Gprocessevents (FALSE, G_ONEEVENT);
        else {
            if (Mcouldgc) {
                if (!processinput (FALSE))
                    Mdogc (M_GCINCR);
            } else if (idlerunmode) {
                if (!processinput (FALSE))
                    GFXidle ();
            } else
                processinput (TRUE);
        }
        if (Erun)
            TXTupdate (), Erun = false;
    }

eop:
#ifdef PARANOID
    GFXterm ();
    TXTterm ();
    Iterm ();
    Dterm ();
    Sterm ();
    Eterm ();
    Pterm ();
    Tterm ();
    Mterm ();
    IOterm ();
    Cterm ();
    Gterm ();
    term ();
#endif
    printusage ();
    graphviz_exit(0);
}

#endif

#ifndef FEATURE_MS
static struct timeval longwait = { 1000, 0 };
static struct timeval zerowait = { 0, 0 };
#endif

static int processinput (int waitflag) {
    fd_set fdset;
#ifndef FEATURE_MS
    struct timeval tz, *tzp;
#else
    HANDLE evs[MAXIMUM_WAIT_OBJECTS];
    int evn;
#endif
    int n, rtn;
    int ioi;

    rtn = 0;
    while (Gprocessevents (FALSE, G_MANYEVENTS))
        rtn = 1;
#ifndef FEATURE_MS
    for (ioi = 0, n = 0; ioi < ion; ioi++)
        if (
            iop[ioi].inuse && iop[ioi].ismonitored &&
            FD_ISSET (fileno (iop[ioi].ifp), &inputfds) &&
            canread (iop[ioi].ifp)
        )
            GFXmonitorfile (ioi), n++;
    if (n || rtn)
        return 1;
    if (Gneedredraw)
        return 0;
    tz = (waitflag && !rtn) ? longwait : zerowait;
    tzp = &tz;
    fdset = inputfds;
    if ((n = select (FD_SETSIZE, &fdset, NULL, NULL, tzp)) <= 0)
        return rtn;
    rtn = 1;
    if (FD_ISSET (Gxfd, &fdset))
        Gprocessevents (TRUE, G_MANYEVENTS), n--;
    if (!n)
        return rtn;
    Gsync ();
    for (ioi = 0; n > 0 && ioi < ion; ioi++)
        if (
            iop[ioi].inuse && iop[ioi].ismonitored &&
            FD_ISSET (fileno (iop[ioi].ifp), &fdset)
        )
            GFXmonitorfile (ioi), n--;
#else
    for (ioi = 0, n = 0, evn = 0; ioi < ion; ioi++) {
        if (!iop[ioi].inuse || !IOismonitored (ioi))
            continue;
        if (
            (iop[ioi].type == IO_FILE && canread (iop[ioi].ifp)) ||
            (iop[ioi].type == IO_PIPE && iop[ioi].buf[0])
        )
            GFXmonitorfile (ioi), n++;
        if (iop[ioi].type != IO_PIPE)
            continue;
        evs[evn++] = iop[ioi].ifp;
    }
    if (n)
        return 1;
    if (Gneedredraw)
        return 0;
    n = MsgWaitForMultipleObjects (
        evn, evs, FALSE, (waitflag && !rtn) ? 1 : 0, QS_ALLINPUT
    );
    if (n == WAIT_TIMEOUT || n < WAIT_OBJECT_0 || n > WAIT_OBJECT_0 + evn)
        return rtn;
    if (n == WAIT_OBJECT_0 + evn)
        Gprocessevents (TRUE, G_MANYEVENTS);
    Gsync ();
    for (ioi = 0; ioi < ion; ioi++)
        if (
            iop[ioi].inuse && IOismonitored (ioi) &&
            (iop[ioi].type == IO_FILE || (iop[ioi].type == IO_PIPE &&
            evs[n - WAIT_OBJECT_0] == iop[ioi].ifp))
        )
            GFXmonitorfile (ioi);
#endif
    return rtn;
}

static char* usestr =
"    -x    - exit after processing the input file.\n\
    -e E  - parse and execute expression E.\n\
    -el N - set error reporting level. (0)\n\
    -sd N - how much of the stack to show if error is printed. (2)\n\
    -sb N - how much of each function in the stack show if error is printed. (2)\n\
    -df S - set default font.\n\
    -ps F - specify a default file name for postscript files.\n\
    -     - read input from stdin.\n\
    -?    - show help.\n\
    -V    - print version.\n";

static void usage(int eval)
{
    fprintf (stderr, "Usage: lefty [options] [file]\n");
    fputs (usestr, stderr);
    graphviz_exit(eval);
}

static void processstr (char *buf) {
    char *words[100];
    char *s, *s1;
    int i;

    if (!(s = buf) || *s == 0)
        return;
    s = strdup (s);
    for (i = 0, s1 = s; *s1; ) {
        for (; *s1 == ' '; s1++)
            ;
        if (!*s1)
            break;
        words[i++] = s1;
        for (; *s1 && *s1 != ' '; s1++)
            ;
        if (*s1)
            *s1 = '\000', s1++;
    }
    words[i] = NULL;
    processargs (i, words);
    free (s);
}

static void processargs (int argc, char *argv[]) {
    while (argc) {
        if (strcmp (argv[0], "-x") == 0)
            endflag = TRUE;
        else if (strcmp (argv[0], "-e") == 0)
            exprstr = argv[1], argv++, argc--;
        else if (strcmp (argv[0], "-el") == 0)
            Eerrlevel = atoi (argv[1]), argv++, argc--;
        else if (strcmp (argv[0], "-sd") == 0)
            Estackdepth = atoi (argv[1]), argv++, argc--;
        else if (strcmp (argv[0], "-sb") == 0)
            Eshowbody = atoi (argv[1]), argv++, argc--;
        else if (strcmp (argv[0], "-sc") == 0)
            argv++, argc--;
        else if (strcmp (argv[0], "-df") == 0)
            Gdefaultfont = argv[1], argv++, argc--;
        else if (strcmp (argv[0], "-w") == 0)
            warnflag = TRUE;
        else if (strcmp (argv[0], "-ps") == 0)
            Gpscanvasname = argv[1], argv++, argc--;
        else if (strcmp (argv[0], "-V") == 0) {
            fprintf (stderr, "lefty version %s\n", LEFTYVERSION);
            fprintf (stderr, "graphviz version %s (%s)\n", PACKAGE_VERSION, BUILDDATE);
	}
        else if (strcmp (argv[0], "-?") == 0)
            usage(0);
        else if (strcmp (argv[0], "-") == 0) {
            if (fp != NULL && fp != stdin)
                fclose(fp);
            fp = stdin;
        } else if (argv[0][0] == '-') {
            fprintf (stderr, "option %s unrecognized\n", argv[0]);
            usage(1);
        }
        else {
            if (fp != NULL && fp != stdin)
                fclose(fp);
            if ((fp = fopen (argv[0], "r")) == NULL) {
                fprintf (stderr, "cannot open input file: %s\n", argv[0]);
                graphviz_exit(2);
            }
        }
        argv++, argc--;
    }
    if (Eerrlevel > 1)
        Gerrflag = TRUE;
}

static void printusage (void) {
#ifdef STATS
    struct rusage ru;

    getrusage (RUSAGE_SELF, &ru);
    Mreport ();
#ifdef FEATURE_RUSAGE
    printf (
        "user   time %13.3lf\n",
        ru.ru_utime.tv_sec + ru.ru_utime.tv_nsec / 1000000000.0
    );
    printf (
        "system time %13.3lf\n",
        ru.ru_stime.tv_sec + ru.ru_stime.tv_nsec / 1000000000.0
    );
#else
    printf (
        "user   time %13.3lf\n",
        ru.ru_utime.tv_sec + ru.ru_utime.tv_usec / 1000000.0
    );
    printf (
        "system time %13.3lf\n",
        ru.ru_stime.tv_sec + ru.ru_stime.tv_usec / 1000000.0
    );
#endif
    printf ("resident size  %10d\n", ru.ru_maxrss * getpagesize ());
    printf ("input            %8d\n", ru.ru_inblock);
    printf ("output           %8d\n", ru.ru_oublock);
    printf ("socket msgs sent %8d\n", ru.ru_msgsnd);
    printf ("socket msgs rcvd %8d\n", ru.ru_msgrcv);
    printf ("real time        %8d\n", time (NULL) - stime);
    fflush (stdout);
#endif
}

/**
 * @dir .
 * @brief a programmable graphics editor
 *
 * @dir ../lneato
 * @brief lefty + neato
 *
 * @dir ../dotty
 * @brief dot + lefty
 *
 * @dir ../../cmd
 * @brief Graph programs
 */
