#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <math.h>

#ifdef _AIX
# include <termio.h>
#else
# include <termios.h>
#endif

#include "grxlib.h"

/*----------------------------------------------------------------------*/

void Done (void)		{ putchar (':'); }
void StartLine (long id)	{ printf ("\033GL%ld", id); }
void StartPoint (long id)	{ printf ("\033GP%ld", id); }
void StartFill (long id)	{ printf ("\033GF%ld", id); }
void Extend (int x, int y)	{ printf (";%d;%d", x, y); }
void FillArea (int x1, int y1, int x2, int y2)
{
   printf (";%d;%d;%d;%d", x1, y1, x2, y2);
}

void PlaceText (long id, int x, int y, int mode, char *text)
{
   printf ("\033GT%ld;%d;%d;%d;%d:%s", id, x, y, mode, strlen(text), text);
   fflush (stdout);
}

void ClearWindow (long id)	{ printf ("\033GC%ld:", id); }
void ForeColor (int col)	{ printf ("\033[3%dm", (col<0||col>7)?0:col); }
void DefaultRendition (void)	{ printf ("\033[m"); }

#define LINESZ	100
static char line [LINESZ];
static FILE *infd = NULL;

long
CreateWin (int x, int y, int w, int h)
{
   long id = 0;

   fflush (stdout);
   printf ("\033GW%d;%d;%d;%d:", x, y, w, h);
   fflush (stdout);
   while (1)
     {
	if ((fgets (line, LINESZ, infd) != NULL) &&
	    (sscanf (line,"\033W%ld", &id) == 1))
	  break;
     }
   return id;
}

void
QueryWin (long id, int *nfwidth, int *nfheight)
{
   int id1, x, y, width, height, fwidth, fheight;
   printf ("\033GG%ld:",id);
   fflush (stdout);
   while (1)
     {
	if ((fgets (line, sizeof(line), infd) != NULL) &&
	    (sscanf (line,"\033G%ld %ld %ld %ld %ld %ld %ld %ld %ld",
		     &id1, &x, &y, &width, &height,
		     &fwidth, &fheight, nfwidth, nfheight) != 0))
	  break;
     }
}

int
WaitForCarriageReturn (long *win, int *x, int *y)
{
   int i, len;

   fgets (line, LINESZ, infd);
   line [LINESZ-1] = 0;
   len = strlen (line);
   for (i = 0; i < len; i++)
     {
	if (line [i] == '\033')
	  {
	     int ret = 1;
	     i++;
	     switch (line[i]) {
	      case 'R': ret++;
		/* drop */
	      case 'P':
		sscanf (&line[i+1],"%ld;%d;%d", win, x, y);
		return ret;
		break;
	     }
	  }
     }
   return 0;
}

static int fno2;
static struct termios ttmode;

int
InitializeGraphics (int scroll_text_up)
{
   int fno, i;
   char *screen_tty;
   struct winsize winsize;

   fno = fileno (stdout);
   if (!isatty (fno))
     {
	fprintf (stderr, "stdout must be a tty\n");
	return 0;
     }
   screen_tty = ttyname (fno);
   ioctl (fno, TCGETS, (char *)&ttmode);
   ttmode.c_lflag &= ~ECHO;
   ioctl (fno, TCSETS, (char *)&ttmode);

   infd = fopen (screen_tty, "rw");

   fno2 = fileno (infd);
   ioctl (fno2, TCGETS, (char *)&ttmode);
   ttmode.c_lflag &= ~ECHO;
   ioctl (fno2, TCSETS, (char *)&ttmode);

   /* query rxvt to find if graphics are available */
   fflush (stdout);
   printf ("\033GQ");
   fflush (stdout);
   while (1)
     {
	if ((fgets (line, LINESZ, infd) != NULL) &&
	    (sscanf (line,"\033G%d", &i) == 1))
	  {
	     if (!i)
	       {
		  fprintf (stderr, "rxvt graphics not available\n");
		  CloseGraphics ();
		  return 0;
	       }
	     break;
	  }
     }
   if (scroll_text_up)
     {
	ioctl (fno, TIOCGWINSZ, &winsize);
	fflush (stdout);
	for (i = 0; i < winsize.ws_row; i++)
	  putchar ('\n');
	fflush (stdout);
     }
   return i;
}

void
CloseGraphics (void)
{
   DefaultRendition ();
   fflush (stdout);
   ttmode.c_lflag |= ECHO;
   ioctl (fno2, TCSETS, (char *)&ttmode);
   fclose (infd);
}
/*----------------------- end-of-file (C source) -----------------------*/