#include "xlib.h"
#include "scheme48.h"

unsigned long AList_To_GCValues(s48_value alist, XGCValues* GCV) {
  unsigned long mask = 0;
  s48_value l, p;
  char* cname;
  s48_value name, value;
  
  for (l = alist; !S48_NULL_P(l); l = S48_CDR(l)) {
    p = S48_CAR(l);
    name = S48_CAR(p);
    value = S48_CDR(p);
    cname = s48_extract_string(S48_SYMBOL_TO_STRING(name));
    
    if (strcmp(cname, "function") == 0) { 
      GCV->function = Symbol_To_Bit(value, Func_Syms);
      mask |= GCFunction;
    } else if (strcmp(cname, "plane-mask") == 0) {
      GCV->plane_mask = EXTRACT_PIXEL(value);
      mask |= GCPlaneMask;
    } else if (strcmp(cname, "foreground") == 0) {
      GCV->foreground = EXTRACT_PIXEL(value);
      mask |= GCForeground;
    } else if (strcmp(cname, "background") == 0) {
      GCV->background = EXTRACT_PIXEL(value);
      mask |= GCBackground;
    } else if (strcmp(cname, "line-width") == 0) {
      GCV->line_width = s48_extract_integer(value);
      mask |= GCLineWidth;
    } else if (strcmp(cname, "line-style") == 0) {
      GCV->line_style = Symbol_To_Bit(value,Line_Style_Syms);
      mask |= GCLineStyle;
    } else if (strcmp(cname, "cap-style") == 0) {
      GCV->cap_style = Symbol_To_Bit(value, Cap_Style_Syms);
      mask |= GCCapStyle;
    } else if (strcmp(cname, "join-style") == 0) {
      GCV->join_style = Symbol_To_Bit(value, Join_Style_Syms);
      mask |= GCJoinStyle;
    } else if (strcmp(cname, "fill-style") == 0) {
      GCV->fill_style = Symbol_To_Bit(value, Fill_Style_Syms);
      mask |= GCFillStyle;
    } else if (strcmp(cname, "fill-rule") == 0) {
      GCV->fill_rule = Symbol_To_Bit(value, Fill_Rule_Syms);
      mask |= GCFillRule;
    } else if (strcmp(cname, "arc-mode") == 0) {
      GCV->arc_mode = Symbol_To_Bit(value, Arc_Mode_Syms);
      mask |= GCArcMode;
    } else if (strcmp(cname, "tile") == 0) {
      GCV->tile = EXTRACT_PIXMAP(value);
      mask |= GCTile;
    } else if (strcmp(cname, "stipple") == 0) {
      GCV->stipple = EXTRACT_PIXMAP(value);
      mask |= GCStipple;
    } else if (strcmp(cname, "ts-x") == 0) {
      GCV->ts_x_origin = s48_extract_integer(value);
      mask |= GCTileStipXOrigin;
    } else if (strcmp(cname, "ts-y") == 0) {
      GCV->ts_y_origin = s48_extract_integer(value);
      mask |= GCTileStipYOrigin;
    } else if (strcmp(cname, "font") == 0) {
      GCV->font = EXTRACT_FONT(value);
      mask |= GCFont;
    } else if (strcmp(cname, "subwindow-mode") == 0) {
      GCV->subwindow_mode = Symbol_To_Bit(value, Subwin_Mode_Syms);
      mask |= GCSubwindowMode;
    } else if (strcmp(cname, "exposures") == 0) {
      GCV->graphics_exposures = !S48_FALSE_P(value);
      mask |= GCGraphicsExposures;
    } else if (strcmp(cname, "clip-x") == 0) {
      GCV->clip_x_origin = s48_extract_integer(value);
      mask |= GCClipXOrigin;
    } else if (strcmp(cname, "clip-y") == 0) {
      GCV->clip_y_origin = s48_extract_integer(value);
      mask |= GCClipYOrigin;
    } else if (strcmp(cname, "clip-mask") == 0) {
      GCV->clip_mask = EXTRACT_PIXMAP(value);
      mask |= GCClipMask;
    } else if (strcmp(cname, "dash-offset") == 0) {
      GCV->dash_offset = s48_extract_integer(value);
      mask |= GCDashOffset;
    } else if (strcmp(cname, "dashes") == 0) {
      GCV->dashes = (char)s48_extract_integer(value);
      mask |= GCDashList;
    }
    // else error ??
  } // for

  return mask;
}  

s48_value Create_Gc(s48_value Xdisplay, s48_value Xdrawable, s48_value args) {
  XGCValues GCV;
  unsigned long mask = AList_To_GCValues(args, &GCV);

  GC Xgcontext = XCreateGC(EXTRACT_DISPLAY(Xdisplay), 
			   EXTRACT_DRAWABLE(Xdrawable), 
			   mask, &GCV);

  return ENTER_GCONTEXT(Xgcontext);
}

s48_value Copy_Gc(s48_value Xdisplay, s48_value Xsource, s48_value Xdest) {
  XCopyGC(EXTRACT_DISPLAY(Xdisplay), EXTRACT_GCONTEXT(Xsource), 
	  ~0L, EXTRACT_GCONTEXT(Xdest));
  return S48_UNSPECIFIC;
}

s48_value Free_Gc(s48_value Xgcontext, s48_value Xdisplay) {
  XFreeGC(EXTRACT_DISPLAY(Xdisplay), EXTRACT_GCONTEXT(Xgcontext));
  return S48_UNSPECIFIC;
}

#define ValidGCValuesBits \
    (GCFunction | GCPlaneMask | GCForeground | GCBackground | GCLineWidth |\
    GCLineStyle | GCCapStyle | GCJoinStyle | GCFillStyle | GCFillRule |\
    GCTile | GCStipple | GCTileStipXOrigin | GCTileStipYOrigin | GCFont |\
    GCSubwindowMode | GCGraphicsExposures | GCClipXOrigin | GCClipYOrigin |\
    GCDashOffset | GCArcMode)

s48_value Get_Gc_Values (s48_value Xgcontext, s48_value Xdisplay) {
  unsigned long mask = ValidGCValuesBits;

  XGCValues GCV;
  s48_value res;
  S48_DECLARE_GC_PROTECT(1);
  
  if (!XGetGCValues (EXTRACT_DISPLAY(Xdisplay), EXTRACT_GCONTEXT(Xgcontext), 
		     mask, &GCV))
    res = S48_FALSE;
  else {
    res = s48_make_vector(23, S48_FALSE);
    S48_GC_PROTECT_1(res);

    S48_VECTOR_SET(res, 0, Bit_To_Symbol(GCV.function, Func_Syms));
    S48_VECTOR_SET(res, 1, ENTER_PIXEL(GCV.plane_mask));
    S48_VECTOR_SET(res, 2, ENTER_PIXEL(GCV.foreground));
    S48_VECTOR_SET(res, 3, ENTER_PIXEL(GCV.background));
    S48_VECTOR_SET(res, 4, s48_enter_integer(GCV.line_width));
    S48_VECTOR_SET(res, 5, Bit_To_Symbol(GCV.line_style, Line_Style_Syms));
    S48_VECTOR_SET(res, 6, Bit_To_Symbol(GCV.cap_style, Cap_Style_Syms));
    S48_VECTOR_SET(res, 7, Bit_To_Symbol(GCV.join_style, Join_Style_Syms));
    S48_VECTOR_SET(res, 8, Bit_To_Symbol(GCV.fill_style, Fill_Style_Syms));
    S48_VECTOR_SET(res, 9, Bit_To_Symbol(GCV.fill_rule, Fill_Rule_Syms));
    S48_VECTOR_SET(res, 10, Bit_To_Symbol(GCV.arc_mode, Arc_Mode_Syms));
    S48_VECTOR_SET(res, 11, ENTER_PIXMAP(GCV.tile));
    S48_VECTOR_SET(res, 12, ENTER_PIXMAP(GCV.stipple));
    S48_VECTOR_SET(res, 13, s48_enter_integer(GCV.ts_x_origin));
    S48_VECTOR_SET(res, 14, s48_enter_integer(GCV.ts_y_origin));
    S48_VECTOR_SET(res, 15, ENTER_FONT(GCV.font));
    S48_VECTOR_SET(res, 16, Bit_To_Symbol(GCV.subwindow_mode, 
					  Subwin_Mode_Syms));
    S48_VECTOR_SET(res, 17, GCV.graphics_exposures ? S48_TRUE : S48_FALSE);
    S48_VECTOR_SET(res, 18, s48_enter_integer(GCV.clip_x_origin));
    S48_VECTOR_SET(res, 19, s48_enter_integer(GCV.clip_y_origin));
    S48_VECTOR_SET(res, 20, ENTER_PIXMAP(GCV.clip_mask));
    S48_VECTOR_SET(res, 21, s48_enter_integer(GCV.dash_offset));
    S48_VECTOR_SET(res, 22, s48_enter_integer(GCV.dashes));
  }
  S48_GC_UNPROTECT();
  return res;
}

s48_value Change_Gc (s48_value Xgcontext, s48_value Xdisplay, s48_value args) {
  XGCValues GCV;
  unsigned long mask = AList_To_GCValues(args, &GCV);
  
  XChangeGC(EXTRACT_DISPLAY(Xdisplay), EXTRACT_GCONTEXT(Xgcontext), 
	    mask, &GCV);

  return S48_UNSPECIFIC;
}

s48_value Set_Gcontext_Dashlist(s48_value Xgcontext, s48_value Xdisplay, 
				s48_value dashoffset, s48_value dashlist) {
  int n = S48_VECTOR_LENGTH(dashlist);
  char v[n];
  int i;
  for (i=0; i<n; i++) {
    v[i] = (char)s48_extract_integer(S48_VECTOR_REF(dashlist, i));
  }

  XSetDashes( EXTRACT_DISPLAY(Xdisplay), EXTRACT_GCONTEXT(Xgcontext), 
	      s48_extract_integer(dashoffset), v, n);

  return S48_UNSPECIFIC;
}

s48_value Set_Gcontext_Clip_Rectangles (s48_value Xgcontext, 
					s48_value Xdisplay, s48_value x, 
					s48_value y, s48_value v, 
					s48_value ord) {
  int n = S48_VECTOR_LENGTH(v);

  XRectangle p[n];

  int i;
  s48_value rect;
  for (i = 0; i < n; i++) {
    rect = S48_VECTOR_REF(v, i);

    p[i].x = (int)s48_extract_integer (S48_CAR (rect)); 
    rect = S48_CDR (rect);
    p[i].y = (int)s48_extract_integer (S48_CAR (rect)); 
    rect = S48_CDR (rect);
    p[i].width = (int)s48_extract_integer (S48_CAR (rect)); 
    rect = S48_CDR (rect);
    p[i].height = (int)s48_extract_integer (S48_CAR (rect));

  }
   
  XSetClipRectangles (EXTRACT_DISPLAY(Xdisplay), EXTRACT_GCONTEXT(Xgcontext), 
		      (int)s48_extract_integer (x),
		      (int)s48_extract_integer (y), p, n, 
		      Symbol_To_Bit(ord, Ordering_Syms));

  return S48_UNSPECIFIC;
}

s48_value Query_Best_Size (s48_value Xdisplay, s48_value width, 
			   s48_value height, s48_value shape) {

  unsigned int rw, rh;
  Display* dpy = EXTRACT_DISPLAY(Xdisplay);

  if (!XQueryBestSize (dpy, 
		       Symbol_To_Bit (shape, Shape_Syms), 
		       DefaultRootWindow (dpy), //??
		       (int)s48_extract_integer (width), 
		       (int)s48_extract_integer (height), 
		       &rw, &rh))
    return S48_FALSE;
  else
    return s48_cons (s48_enter_integer (rw), s48_enter_integer (rh));
}


void s48_init_gcontext(void) {
  S48_EXPORT_FUNCTION(Create_Gc);
  S48_EXPORT_FUNCTION(Free_Gc);
  S48_EXPORT_FUNCTION(Copy_Gc);
  S48_EXPORT_FUNCTION(Get_Gc_Values);
  S48_EXPORT_FUNCTION(Change_Gc);
  S48_EXPORT_FUNCTION(Set_Gcontext_Dashlist);
  S48_EXPORT_FUNCTION(Set_Gcontext_Clip_Rectangles);
  S48_EXPORT_FUNCTION(Query_Best_Size);
}