#include <string.h>
#ifdef __TURBOC__
#include <alloc.h>
#else
#include <malloc.h>
#endif

  /* see Fractint.c for a description of the "include"  hierarchy */
#include "port.h"
#include "prototyp.h"
#include "lsys.h"

#ifdef max
#undef max
#endif

struct lsys_cmd {
    void (*f)(struct lsys_turtlestatef *);
    int ptype;
    union {
        long n;
        LDBL nf;
    } parm;
    char ch;
};

#define sins_f ((LDBL *)(boxy))
#define coss_f (((LDBL *)(boxy)+50))

static struct lsys_cmd far * _fastcall findsize(struct lsys_cmd far *,struct lsys_turtlestatef *, struct lsys_cmd far **,int);

/* Define blanks for portability */
#ifdef XFRACT
void lsysf_prepfpu(struct lsys_turtlestatef *x) { }
void lsysf_donefpu(struct lsys_turtlestatef *x) { }
#endif


#ifdef XFRACT
static void lsysf_doplus(struct lsys_turtlestatef *cmd)
{
    if (cmd->reverse) {
        if (++cmd->angle == cmd->maxangle)
            cmd->angle = 0;
    }
    else {
        if (cmd->angle)
            cmd->angle--;
        else
            cmd->angle = cmd->dmaxangle;
    }
}
#else
extern void lsysf_doplus(struct lsys_turtlestatef *cmd);
#endif

#ifdef XFRACT
/* This is the same as lsys_doplus, except maxangle is a power of 2. */
static void lsysf_doplus_pow2(struct lsys_turtlestatef *cmd)
{
    if (cmd->reverse) {
        cmd->angle++;
        cmd->angle &= cmd->dmaxangle;
    }
    else {
        cmd->angle--;
        cmd->angle &= cmd->dmaxangle;
    }
}
#else
extern void lsysf_doplus_pow2(struct lsys_turtlestatef *cmd);
#endif

#ifdef XFRACT
static void lsysf_dominus(struct lsys_turtlestatef *cmd)
{
    if (cmd->reverse) {
        if (cmd->angle)
            cmd->angle--;
        else
            cmd->angle = cmd->dmaxangle;
    }
    else {
        if (++cmd->angle == cmd->maxangle)
            cmd->angle = 0;
    }
}
#else
extern void lsysf_dominus(struct lsys_turtlestatef *cmd);
#endif

#ifdef XFRACT
static void lsysf_dominus_pow2(struct lsys_turtlestatef *cmd)
{
    if (cmd->reverse) {
        cmd->angle--;
        cmd->angle &= cmd->dmaxangle;
    }
    else {
        cmd->angle++;
        cmd->angle &= cmd->dmaxangle;
    }
}
#else
extern void lsysf_dominus_pow2(struct lsys_turtlestatef *cmd);
#endif

#ifdef XFRACT
static void lsysf_doslash(struct lsys_turtlestatef *cmd)
{
    if (cmd->reverse)
        cmd->realangle -= cmd->parm.nf;
    else
        cmd->realangle += cmd->parm.nf;
}
#else
extern void lsysf_doslash(struct lsys_turtlestatef *cmd);
#endif

#ifdef XFRACT
static void lsysf_dobslash(struct lsys_turtlestatef *cmd)
{
    if (cmd->reverse)
        cmd->realangle += cmd->parm.nf;
    else
        cmd->realangle -= cmd->parm.nf;
}
#else
extern void lsysf_dobslash(struct lsys_turtlestatef *cmd);
#endif

#ifdef XFRACT
static void lsysf_doat(struct lsys_turtlestatef *cmd)
{
    cmd->size *= cmd->parm.nf;
}
#else
extern void lsysf_doat(struct lsys_turtlestatef *cmd, long n);
#endif

static void
lsysf_dopipe(struct lsys_turtlestatef *cmd)
{
    cmd->angle = (char)(cmd->angle + cmd->maxangle / 2);
    cmd->angle %= cmd->maxangle;
}

#ifdef XFRACT
static void lsysf_dopipe_pow2(struct lsys_turtlestatef *cmd)
{
    cmd->angle += cmd->maxangle >> 1;
    cmd->angle &= cmd->dmaxangle;
}
#else
extern void lsysf_dopipe_pow2(struct lsys_turtlestatef *cmd);
#endif

#ifdef XFRACT
static void lsysf_dobang(struct lsys_turtlestatef *cmd)
{
    cmd->reverse = ! cmd->reverse;
}
#else
extern void lsysf_dobang(struct lsys_turtlestatef *cmd);
#endif

#ifdef XFRACT
static void lsysf_dosizedm(struct lsys_turtlestatef *cmd)
{
    double angle = (double) cmd->realangle;
    double s, c;

    s = sin(angle);
    c = cos(angle);

    cmd->xpos += cmd->size * cmd->aspect * c;
    cmd->ypos += cmd->size * s;

    if (cmd->xpos>cmd->xmax) cmd->xmax=cmd->xpos;
    if (cmd->ypos>cmd->ymax) cmd->ymax=cmd->ypos;
    if (cmd->xpos<cmd->xmin) cmd->xmin=cmd->xpos;
    if (cmd->ypos<cmd->ymin) cmd->ymin=cmd->ypos;
}
#else
extern void lsysf_dosizedm(struct lsys_turtlestatef *cmd, long n);
#endif

#ifdef XFRACT
static void lsysf_dosizegf(struct lsys_turtlestatef *cmd)
{
    cmd->xpos += cmd->size * coss_f[(int)cmd->angle];
    cmd->ypos += cmd->size * sins_f[(int)cmd->angle];

    if (cmd->xpos>cmd->xmax) cmd->xmax=cmd->xpos;
    if (cmd->ypos>cmd->ymax) cmd->ymax=cmd->ypos;
    if (cmd->xpos<cmd->xmin) cmd->xmin=cmd->xpos;
    if (cmd->ypos<cmd->ymin) cmd->ymin=cmd->ypos;
}
#else
extern void lsysf_dosizegf(struct lsys_turtlestatef *cmd);
#endif

#ifdef XFRACT
static void lsysf_dodrawd(struct lsys_turtlestatef *cmd)
{
    double angle = (double) cmd->realangle;
    double s, c;
    int lastx, lasty;
    s = sin(angle);
    c = cos(angle);

    lastx=(int) cmd->xpos;
    lasty=(int) cmd->ypos;

    cmd->xpos += cmd->size * cmd->aspect * c;
    cmd->ypos += cmd->size * s;

    draw_line(lastx, lasty, (int) cmd->xpos, (int) cmd->ypos, cmd->curcolor);
}
#else
extern void lsysf_dodrawd(struct lsys_turtlestatef *cmd);
#endif

#ifdef XFRACT
static void lsysf_dodrawm(struct lsys_turtlestatef *cmd)
{
    double angle = (double) cmd->realangle;
    double s, c;

    s = sin(angle);
    c = cos(angle);

    cmd->xpos += cmd->size * cmd->aspect * c;
    cmd->ypos += cmd->size * s;
}
#else
extern void lsysf_dodrawm(struct lsys_turtlestatef *cmd);
#endif

#ifdef XFRACT
static void lsysf_dodrawg(struct lsys_turtlestatef *cmd)
{
    cmd->xpos += cmd->size * coss_f[(int)cmd->angle];
    cmd->ypos += cmd->size * sins_f[(int)cmd->angle];
}
#else
extern void lsysf_dodrawg(struct lsys_turtlestatef *cmd);
#endif

#ifdef XFRACT
static void lsysf_dodrawf(struct lsys_turtlestatef *cmd)
{
    int lastx = (int) cmd->xpos;
    int lasty = (int) cmd->ypos;
    cmd->xpos += cmd->size * coss_f[(int)cmd->angle];
    cmd->ypos += cmd->size * sins_f[(int)cmd->angle];
    draw_line(lastx,lasty,(int) cmd->xpos, (int) cmd->ypos, cmd->curcolor);
}
#else
extern void lsysf_dodrawf(struct lsys_turtlestatef *cmd);
#endif

static void lsysf_dodrawc(struct lsys_turtlestatef *cmd)
{
    cmd->curcolor = (char)(((int) cmd->parm.n) % colors);
}

static void lsysf_dodrawgt(struct lsys_turtlestatef *cmd)
{
    cmd->curcolor = (char)(cmd->curcolor - cmd->parm.n);
    if ((cmd->curcolor %= colors) == 0)
        cmd->curcolor = (char)(colors-1);
}

static void lsysf_dodrawlt(struct lsys_turtlestatef *cmd)
{
    cmd->curcolor = (char)(cmd->curcolor + cmd->parm.n);
    if ((cmd->curcolor %= colors) == 0)
        cmd->curcolor = 1;
}

static struct lsys_cmd far * _fastcall
findsize(struct lsys_cmd far *command, struct lsys_turtlestatef *ts, struct lsys_cmd far **rules, int depth)
{
   struct lsys_cmd far **rulind;
   int tran;

   if (overflow)     /* integer math routines overflowed */
      return NULL;

   if (stackavail() < 400) { /* leave some margin for calling subrtns */
      ts->stackoflow = 1;
      return NULL;
   }


   while (command->ch && command->ch !=']') {
      if (! (ts->counter++)) {
         static FCODE msg[]={"L-System thinking (higher orders take longer)"};
         /* let user know we're not dead */
         if (thinking(1,msg)) {
            ts->counter--;
            return NULL;
         }
      }
      tran=0;
      if (depth) {
         for(rulind=rules;*rulind;rulind++)
            if ((*rulind)->ch==command->ch) {
               tran=1;
               if (findsize((*rulind)+1,ts,rules,depth-1) == NULL)
                  return(NULL);
            }
      }
      if (!depth || !tran) {
        if (command->f) {
            switch (command->ptype) {
                case 4:
                    ts->parm.n = command->parm.n;
                    break;
                case 10:
                    ts->parm.nf = command->parm.nf;
                    break;
                default:
                    break;
            }
            (*command->f)(ts);
        }
        else if (command->ch == '[') {
          char saveang,saverev;
          LDBL savesize,savex,savey,saverang;

          lsys_donefpu(ts);
          saveang=ts->angle;
          saverev=ts->reverse;
          savesize=ts->size;
          saverang=ts->realangle;
          savex=ts->xpos;
          savey=ts->ypos;
          lsys_prepfpu(ts);
          if ((command=findsize(command+1,ts,rules,depth)) == NULL)
             return(NULL);
          lsys_donefpu(ts);
          ts->angle=saveang;
          ts->reverse=saverev;
          ts->size=savesize;
          ts->realangle=saverang;
          ts->xpos=savex;
          ts->ypos=savey;
          lsys_prepfpu(ts);
        }
      }
      command++;
   }
   return command;
}

int _fastcall
lsysf_findscale(struct lsys_cmd far *command, struct lsys_turtlestatef *ts, struct lsys_cmd far **rules, int depth)
{
   float horiz,vert;
   LDBL xmin, xmax, ymin, ymax;
   LDBL locsize;
   LDBL locaspect;
   struct lsys_cmd far *fsret;

   locaspect=screenaspect*xdots/ydots;
   ts->aspect = locaspect;
   ts->xpos =
   ts->ypos =
   ts->xmin =
   ts->xmax =
   ts->ymax =
   ts->ymin = 0;
   ts->angle =
   ts->reverse =
   ts->counter = 0;
   ts->realangle = 0;
   ts->size = 1;
   lsys_prepfpu(ts);
   fsret = findsize(command,ts,rules,depth);
   lsys_donefpu(ts);
   thinking(0, NULL); /* erase thinking message if any */
   xmin = ts->xmin;
   xmax = ts->xmax;
   ymin = ts->ymin;
   ymax = ts->ymax;
/*   locsize = ts->size; */
   if (fsret == NULL)
      return 0;
   if (xmax == xmin)
      horiz = (float)1E37;
   else
      horiz = (float)((xdots-10)/(xmax-xmin));
   if (ymax == ymin)
      vert = (float)1E37;
   else
      vert = (float)((ydots-6) /(ymax-ymin));
   locsize = (vert<horiz) ? vert : horiz;

   if (horiz == 1E37)
      ts->xpos = xdots/2;
   else
/*    ts->xpos = -xmin*(locsize)+5+((xdots-10)-(locsize)*(xmax-xmin))/2; */
      ts->xpos = (xdots-locsize*(xmax+xmin))/2;
   if (vert == 1E37)
      ts->ypos = ydots/2;
   else
/*    ts->ypos = -ymin*(locsize)+3+((ydots-6)-(locsize)*(ymax-ymin))/2; */
      ts->ypos = (ydots-locsize*(ymax+ymin))/2;
   ts->size = locsize;

   return 1;
}

struct lsys_cmd far * _fastcall
drawLSysF(struct lsys_cmd far *command,struct lsys_turtlestatef *ts, struct lsys_cmd far **rules,int depth)
{
   struct lsys_cmd far **rulind;
   int tran;

   if (overflow)     /* integer math routines overflowed */
      return NULL;


   if (stackavail() < 400) { /* leave some margin for calling subrtns */
      ts->stackoflow = 1;
      return NULL;
   }


   while (command->ch && command->ch !=']') {
      if (!(ts->counter++)) {
         if (keypressed()) {
            ts->counter--;
            return NULL;
         }
      }
      tran=0;
      if (depth) {
         for(rulind=rules;*rulind;rulind++)
            if ((*rulind)->ch == command->ch) {
               tran=1;
               if (drawLSysF((*rulind)+1,ts,rules,depth-1) == NULL)
                  return NULL;
            }
      }
      if (!depth||!tran) {
        if (command->f) {
            switch (command->ptype) {
                case 4:
                    ts->parm.n = command->parm.n;
                    break;
                case 10:
                    ts->parm.nf = command->parm.nf;
                    break;
                default:
                    break;
            }
            (*command->f)(ts);
        }
        else if (command->ch == '[') {
          char saveang,saverev,savecolor;
          LDBL savesize,savex,savey,saverang;

          lsys_donefpu(ts);
          saveang=ts->angle;
          saverev=ts->reverse;
          savesize=ts->size;
          saverang=ts->realangle;
          savex=ts->xpos;
          savey=ts->ypos;
          savecolor=ts->curcolor;
          lsys_prepfpu(ts);
          if ((command=drawLSysF(command+1,ts,rules,depth)) == NULL)
             return(NULL);
          lsys_donefpu(ts);
          ts->angle=saveang;
          ts->reverse=saverev;
          ts->size=savesize;
          ts->realangle=saverang;
          ts->xpos=savex;
          ts->ypos=savey;
          ts->curcolor=savecolor;
          lsys_prepfpu(ts);
        }
      }
      command++;
   }
   return command;
}

struct lsys_cmd far *
LSysFSizeTransform(char far *s, struct lsys_turtlestatef *ts)
{
  struct lsys_cmd far *ret;
  struct lsys_cmd far *doub;
  int max = 10;
  int n = 0;
  void (*f)();
  long num;
  int ptype;
  double PI180 = PI / 180.0;

  void (*plus)() = (ispow2(ts->maxangle)) ? lsysf_doplus_pow2 : lsysf_doplus;
  void (*minus)() = (ispow2(ts->maxangle)) ? lsysf_dominus_pow2 : lsysf_dominus;
  void (*pipe)() = (ispow2(ts->maxangle)) ? lsysf_dopipe_pow2 : lsysf_dopipe;

  void (*slash)() =  lsysf_doslash;
  void (*bslash)() = lsysf_dobslash;
  void (*at)() =     lsysf_doat;
  void (*dogf)() =   lsysf_dosizegf;

  ret = (struct lsys_cmd far *) farmemalloc((long) max * sizeof(struct lsys_cmd));
  if (ret == NULL) {
       ts->stackoflow = 1;
       return NULL;
       }
  while (*s) {
    f = NULL;
    num = 0;
    ptype = 4;
    ret[n].ch = *s;
    switch (*s) {
      case '+': f = plus;            break;
      case '-': f = minus;           break;
      case '/': f = slash;           ptype = 10;  ret[n].parm.nf = getnumber(&s) * PI180;  break;
      case '\\': f = bslash;         ptype = 10;  ret[n].parm.nf = getnumber(&s) * PI180;  break;
      case '@': f = at;              ptype = 10;  ret[n].parm.nf = getnumber(&s);  break;
      case '|': f = pipe;            break;
      case '!': f = lsysf_dobang;     break;
      case 'd':
      case 'm': f = lsysf_dosizedm;   break;
      case 'g':
      case 'f': f = dogf;       break;
      case '[': num = 1;        break;
      case ']': num = 2;        break;
      default:
        num = 3;
        break;
    }
#ifdef XFRACT
    ret[n].f = (void (*)())f;
#else
    ret[n].f = (void (*)(struct lsys_turtlestatef *))f;
#endif
    if (ptype == 4)
        ret[n].parm.n = num;
    ret[n].ptype = ptype;
    if (++n == max) {
      doub = (struct lsys_cmd far *) farmemalloc((long) max*2*sizeof(struct lsys_cmd));
      if (doub == NULL) {
         farmemfree(ret);
         ts->stackoflow = 1;
         return NULL;
         }
      far_memcpy(doub, ret, max*sizeof(struct lsys_cmd));
      farmemfree(ret);
      ret = doub;
      max <<= 1;
    }
    s++;
  }
  ret[n].ch = 0;
  ret[n].f = NULL;
  ret[n].parm.n = 0;
  n++;

  doub = (struct lsys_cmd far *) farmemalloc((long) n*sizeof(struct lsys_cmd));
  if (doub == NULL) {
       farmemfree(ret);
       ts->stackoflow = 1;
       return NULL;
       }
  far_memcpy(doub, ret, n*sizeof(struct lsys_cmd));
  farmemfree(ret);
  return doub;
}

struct lsys_cmd far *
LSysFDrawTransform(char far *s, struct lsys_turtlestatef *ts)
{
  struct lsys_cmd far *ret;
  struct lsys_cmd far *doub;
  int max = 10;
  int n = 0;
  void (*f)();
  LDBL num;
  int ptype;
  LDBL PI180 = PI / 180.0;

  void (*plus)() = (ispow2(ts->maxangle)) ? lsysf_doplus_pow2 : lsysf_doplus;
  void (*minus)() = (ispow2(ts->maxangle)) ? lsysf_dominus_pow2 : lsysf_dominus;
  void (*pipe)() = (ispow2(ts->maxangle)) ? lsysf_dopipe_pow2 : lsysf_dopipe;

  void (*slash)() =  lsysf_doslash;
  void (*bslash)() = lsysf_dobslash;
  void (*at)() =     lsysf_doat;
  void (*drawg)() =  lsysf_dodrawg;

  ret = (struct lsys_cmd far *) farmemalloc((long) max * sizeof(struct lsys_cmd));
  if (ret == NULL) {
       ts->stackoflow = 1;
       return NULL;
       }
  while (*s) {
    f = NULL;
    num = 0;
    ptype = 4;
    ret[n].ch = *s;
    switch (*s) {
      case '+': f = plus;            break;
      case '-': f = minus;           break;
      case '/': f = slash;           ptype = 10;  ret[n].parm.nf = getnumber(&s) * PI180;  break;
      case '\\': f = bslash;         ptype = 10;  ret[n].parm.nf = getnumber(&s) * PI180;  break;
      case '@': f = at;              ptype = 10;  ret[n].parm.nf = getnumber(&s);  break;
      case '|': f = pipe;            break;
      case '!': f = lsysf_dobang;    break;
      case 'd': f = lsysf_dodrawd;   break;
      case 'm': f = lsysf_dodrawm;   break;
      case 'g': f = drawg;           break;
      case 'f': f = lsysf_dodrawf;   break;
      case 'c': f = lsysf_dodrawc;   num = getnumber(&s);    break;
      case '<': f = lsysf_dodrawlt;  num = getnumber(&s);    break;
      case '>': f = lsysf_dodrawgt;  num = getnumber(&s);    break;
      case '[': num = 1;        break;
      case ']': num = 2;        break;
      default:
        num = 3;
        break;
    }
#ifdef XFRACT
    ret[n].f = (void (*)())f;
#else
    ret[n].f = (void (*)(struct lsys_turtlestatef *))f;
#endif
    if (ptype == 4)
        ret[n].parm.n = (long)num;
    ret[n].ptype = ptype;
    if (++n == max) {
      doub = (struct lsys_cmd far *) farmemalloc((long) max*2*sizeof(struct lsys_cmd));
      if (doub == NULL) {
           farmemfree(ret);
           ts->stackoflow = 1;
           return NULL;
           }
      far_memcpy(doub, ret, max*sizeof(struct lsys_cmd));
      farmemfree(ret);
      ret = doub;
      max <<= 1;
    }
    s++;
  }
  ret[n].ch = 0;
  ret[n].f = NULL;
  ret[n].parm.n = 0;
  n++;

  doub = (struct lsys_cmd far *) farmemalloc((long) n*sizeof(struct lsys_cmd));
  if (doub == NULL) {
       farmemfree(ret);
       ts->stackoflow = 1;
       return NULL;
       }
  far_memcpy(doub, ret, n*sizeof(struct lsys_cmd));
  farmemfree(ret);
  return doub;
}

void _fastcall lsysf_dosincos(void)
{
   LDBL locaspect;
   LDBL TWOPI = 2.0 * PI;
   LDBL twopimax;
   LDBL twopimaxi;
   int i;

   locaspect=screenaspect*xdots/ydots;
   twopimax = TWOPI / maxangle;
   for(i=0;i<maxangle;i++) {
      twopimaxi = i * twopimax;
      sins_f[i]= sinl(twopimaxi);
      coss_f[i]= locaspect * cosl(twopimaxi);
   }

}
