/*
 *
 *
Copyright 1989, 1998  The Open Group

Permission to use, copy, modify, distribute, and sell this software and its
documentation for any purpose is hereby granted without fee, provided that
the above copyright notice appear in all copies and that both that
copyright notice and this permission notice appear in supporting
documentation.

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Except as contained in this notice, the name of The Open Group shall not be
used in advertising or otherwise to promote the sale, use or other dealings
in this Software without prior written authorization from The Open Group.
 * *
 * Author:  Jim Fulton, MIT X Consortium
 */

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include <X11/Xfuncproto.h>
#include <X11/Intrinsic.h>
#include <X11/StringDefs.h>
#include <X11/Xos.h>
#include <X11/Xatom.h>
#include <X11/Shell.h>
#include <X11/Xaw/Cardinals.h>
#include <X11/Xaw/Paned.h>
#include <X11/Xaw/Box.h>
#include <X11/Xaw/Form.h>
#include <X11/Xaw/Command.h>
#include <stdio.h>
#include <stdlib.h>
#ifdef USE_GETTEXT
# include <X11/Xlocale.h>
# include <libintl.h>
#else
# define gettext(a) (a)
#endif
#include "grid.h"
#ifdef XRENDER
#include <X11/Xft/Xft.h>
#include <X11/extensions/Xrender.h>
#endif

static char *ProgramName;

static XrmOptionDescRec xfd_options[] = {
{"-fn",		"*grid.font",	XrmoptionSepArg,	(caddr_t) NULL },
#ifdef XRENDER
{"-fa",		"*grid.face", XrmoptionSepArg,		(caddr_t) NULL },
#endif
{"-start",	"*startChar",	XrmoptionSepArg, 	(caddr_t) NULL },
{"-box",	"*grid.boxChars", XrmoptionNoArg,	(caddr_t) "on" },
{"-bc",		"*grid.boxColor", XrmoptionSepArg, 	(caddr_t) NULL },
{"-center",	"*grid.centerChars", XrmoptionNoArg,	(caddr_t) "on" },
{"-rows",	"*grid.cellRows", XrmoptionSepArg,	(caddr_t) NULL },
{"-columns",	"*grid.cellColumns", XrmoptionSepArg,	(caddr_t) NULL },
};

static void usage(int exitval) _X_NORETURN _X_COLD;
static void SelectChar(Widget w, XtPointer closure, XtPointer data);
static void do_quit(Widget w, XEvent *event, String *params,
		    Cardinal *num_params) _X_NORETURN;
static void change_page(int page);
static void set_button_state(void);
static void do_prev(Widget w, XEvent *event, String *params,
		    Cardinal *num_params);
static void do_next(Widget w, XEvent *event, String *params,
		    Cardinal *num_params);
static void do_prev16(Widget w, XEvent *event, String *params,
		      Cardinal *num_params);
static void do_next16(Widget w, XEvent *event, String *params,
		      Cardinal *num_params);
static char *get_font_name(Display *dpy, XFontStruct *fs);
static void CatchFontConversionWarning(String name, String type, String class,
				       String defaultp, String *params,
				       Cardinal *np);

static XtActionsRec xfd_actions[] = {
  { "Quit", do_quit },
  { "Prev16", do_prev16 },
  { "Prev", do_prev },
  { "Next", do_next },
  { "Next16", do_next16 },
};

static Atom wm_delete_window;

static Widget quitButton, prev16Button, prevButton, nextButton, next16Button;


#define DEF_SELECT_FORMAT "character 0x%04x%02x (%u,%u) (%#o,%#o)"
#define DEF_METRICS_FORMAT "width %d; left %d, right %d; ascent %d, descent %d (font %d, %d)"
#define DEF_RANGE_FORMAT "range:  0x%04x%02x (%u,%u) thru 0x%04x%02x (%u,%u)"
#define DEF_START_FORMAT "upper left:  0x%06x (%d,%d)"
#define DEF_NOCHAR_FORMAT "no such character 0x%04x%02x (%u,%u) (%#o,%#o)"

static struct _xfd_resources {
  char *select_format;
  char *metrics_format;
  char *range_format;
  char *start_format;
  char *nochar_format;
} xfd_resources;

#define Offset(field) XtOffsetOf(struct _xfd_resources, field)

static XtResource Resources[] = {
  { "selectFormat", "SelectFormat", XtRString, sizeof(char *),
      Offset(select_format), XtRString, DEF_SELECT_FORMAT },
  { "metricsFormat", "MetricsFormat", XtRString, sizeof(char *),
      Offset(metrics_format), XtRString, DEF_METRICS_FORMAT },
  { "rangeFormat", "RangeFormat", XtRString, sizeof(char *),
      Offset(range_format), XtRString, DEF_RANGE_FORMAT },
  { "startFormat", "StartFormat", XtRString, sizeof(char *),
      Offset(start_format), XtRString, DEF_START_FORMAT },
  { "nocharFormat", "NocharFormat", XtRString, sizeof(char *),
      Offset(nochar_format), XtRString, DEF_NOCHAR_FORMAT },
};

#undef Offset

static void
usage(int exitval)
{
    fprintf (stderr, gettext("usage:  %s [-options ...] "), ProgramName);
    fprintf (stderr, "-fn ");
    fprintf (stderr, gettext("font\n\n"));
#ifdef XRENDER
    fprintf (stderr, gettext("        %s [-options ...] "), ProgramName);
    fprintf (stderr, "-fa ");
    fprintf (stderr, gettext("font\n\n"));
#endif
    fprintf (stderr, gettext("where options include:\n"));
    fprintf (stderr, "    -display ");
    fprintf (stderr, gettext("display       X server to contact\n"));
    fprintf (stderr, "    -geometry ");
    fprintf (stderr, gettext("geometry     size and location of window\n"));
    fprintf (stderr, "    -bc ");
    fprintf (stderr, gettext("color              color for ImageText boxes\n"));
    fprintf (stderr, "    -start ");
    fprintf (stderr, gettext("number          first character to show\n"));
    fprintf (stderr, "    -box                   ");
    fprintf (stderr, gettext("show a box around each character\n"));
    fprintf (stderr, "    -center                ");
    fprintf (stderr, gettext("center each character inside its grid\n"));
    fprintf (stderr, "    -rows ");
    fprintf (stderr, gettext("number           number of rows in grid\n"));
    fprintf (stderr, "    -columns ");
    fprintf (stderr, gettext("number        number of columns in grid\n"));
    exit (exitval);
}


static Widget selectLabel, metricsLabel, rangeLabel, startLabel, fontGrid;

static Boolean fontConversionFailed = False;
static XtErrorMsgHandler oldWarningHandler;

int
main(int argc, char *argv[])
{
    XtAppContext xtcontext;
    Widget toplevel, pane, toplabel, box, form;
    char buf[256];
    Arg av[10];
    Cardinal i;
    static XtCallbackRec cb[2] = { { SelectChar, NULL }, { NULL, NULL } };
    XFontStruct *fs;
#ifdef XRENDER
    XftFont *xft;
#endif
    char *fontname;
    long minn, maxn;

    XtSetLanguageProc(NULL, NULL, NULL);

    ProgramName = argv[0];

    /* Handle args that don't require opening a display */
    for (int n = 1; n < argc; n++) {
	const char *argn = argv[n];
	/* accept single or double dash for -help & -version */
	if (argn[0] == '-' && argn[1] == '-') {
	    argn++;
	}
	if (strcmp (argn, "-help") == 0) {
	    usage (0);
	}
	if (strcmp (argn, "-version") == 0) {
	    puts (PACKAGE_STRING);
	    exit (0);
	}
    }

    toplevel = XtAppInitialize (&xtcontext, "Xfd",
				xfd_options, XtNumber(xfd_options),
				&argc, argv, NULL, NULL, 0);

    if (argc != 1) {
	fputs("Unknown argument(s):", stderr);
	for (int n = 1; n < argc; n++) {
	    fprintf(stderr, " %s", argv[n]);
	}
	fputs("\n\n", stderr);
	usage (1);
    }
    
#ifdef USE_GETTEXT
    {
	const char *domaindir;

	textdomain("xfd");

        /* mainly for debugging */
	if ((domaindir = getenv ("TEXTDOMAINDIR")) == NULL) {
	    domaindir = LOCALEDIR;
	}
	bindtextdomain ("xfd", domaindir);
    }
#endif

    Resources[0].default_addr = gettext(DEF_SELECT_FORMAT);
    Resources[1].default_addr = gettext(DEF_METRICS_FORMAT);
    Resources[2].default_addr = gettext(DEF_RANGE_FORMAT);
    Resources[3].default_addr = gettext(DEF_START_FORMAT);
    Resources[4].default_addr = gettext(DEF_NOCHAR_FORMAT);

    XtAppAddActions (xtcontext, xfd_actions, XtNumber (xfd_actions));
    XtOverrideTranslations
        (toplevel, XtParseTranslationTable ("<Message>WM_PROTOCOLS: Quit()"));

    XtGetApplicationResources (toplevel, (XtPointer) &xfd_resources, Resources,
			       XtNumber (Resources), NULL, ZERO);


    /* pane wrapping everything */
    pane = XtCreateManagedWidget ("pane", panedWidgetClass, toplevel,
				  NULL, ZERO);

    /* font name */
    toplabel = XtCreateManagedWidget ("fontname", labelWidgetClass, pane,
				      NULL, ZERO);

    /* button box */
    box = XtCreateManagedWidget ("box", boxWidgetClass, pane, NULL, ZERO);
    quitButton = XtCreateManagedWidget ("quit", commandWidgetClass, box,
					NULL, ZERO);
    prev16Button = XtCreateManagedWidget ("prev16", commandWidgetClass, box,
					NULL, ZERO);
    prevButton = XtCreateManagedWidget ("prev", commandWidgetClass, box,
					NULL, ZERO);
    nextButton = XtCreateManagedWidget ("next", commandWidgetClass, box,
					NULL, ZERO);
    next16Button = XtCreateManagedWidget ("next16", commandWidgetClass, box,
					NULL, ZERO);


    /* and labels in which to put information */
    selectLabel = XtCreateManagedWidget ("select", labelWidgetClass,
					 pane, NULL, ZERO);

    metricsLabel = XtCreateManagedWidget ("metrics", labelWidgetClass,
					  pane, NULL, ZERO);

    rangeLabel = XtCreateManagedWidget ("range", labelWidgetClass, pane,
					NULL, ZERO);

    startLabel = XtCreateManagedWidget ("start", labelWidgetClass, pane,
					NULL, ZERO);

    /* form in which to draw */
    form = XtCreateManagedWidget ("form", formWidgetClass, pane, NULL, ZERO);

    i = 0;
    XtSetArg (av[i], XtNtop, XtChainTop); i++;
    XtSetArg (av[i], XtNbottom, XtChainBottom); i++;
    XtSetArg (av[i], XtNleft, XtChainLeft); i++;
    XtSetArg (av[i], XtNright, XtChainRight); i++;
    XtSetArg (av[i], XtNcallback, cb); i++;

    oldWarningHandler = XtAppSetWarningMsgHandler(xtcontext,
						  CatchFontConversionWarning);

    fontGrid = XtCreateManagedWidget ("grid", fontgridWidgetClass, form,
				      av, i);

    XtAppSetWarningMsgHandler(xtcontext, oldWarningHandler);

    /* set the label at the top to tell us which font this is */
#ifdef XRENDER
    i = 0;
    XtSetArg (av[i], XtNface, &xft); i++;
    XtGetValues (fontGrid, av, i);
    if (xft)
    {
	FcChar8	*family;
	FcChar8	*style;
	FcPattern   *p;
	double	size;
	family = (FcChar8 *) "";
	FcPatternGetString (xft->pattern, FC_FAMILY, 0, &family);
	style = (FcChar8 *) "";
	FcPatternGetString (xft->pattern, FC_STYLE, 0, &style);
	size = 0;
	FcPatternGetDouble (xft->pattern, FC_SIZE, 0, &size);
	p = FcPatternBuild (NULL,
			    FC_FAMILY, FcTypeString, family,
			    FC_STYLE, FcTypeString, style,
			    FC_SIZE, FcTypeDouble, size,
			    NULL);
	fontname = (char *) FcNameUnparse (p);
	FcPatternDestroy (p);
    }
    else
#endif
    {
	i = 0;
	XtSetArg (av[i], XtNfont, &fs); i++;
	XtGetValues (fontGrid, av, i);
	if (!fs || fontConversionFailed) {
	    fprintf (stderr, gettext("%s:  no font to display\n"), ProgramName);
	    exit (1);
	}
	fontname = get_font_name (XtDisplay(toplevel), fs);
	if (!fontname) fontname = gettext("unknown font!");
    }
    i = 0;
    XtSetArg (av[i], XtNlabel, fontname); i++;
    XtSetValues (toplabel, av, i);

    minn = GridFirstChar (fontGrid);
    maxn = GridLastChar (fontGrid);
    snprintf (buf, sizeof(buf), xfd_resources.range_format,
	      minn >> 8, minn & 0xff,
	      minn >> 8, minn & 0xff,
	      maxn >> 8, maxn & 0xff,
	      maxn >> 8, maxn & 0xff);

    i = 0;
    XtSetArg (av[i], XtNlabel, buf); i++;
    XtSetValues (rangeLabel, av, i);

    XtRealizeWidget (toplevel);

    wm_delete_window = XInternAtom(XtDisplay(toplevel), "WM_DELETE_WINDOW",
                                   False);
    (void) XSetWMProtocols (XtDisplay(toplevel), XtWindow(toplevel),
                            &wm_delete_window, 1);

    change_page (0);
    XtAppMainLoop (xtcontext);
    exit(0);
}

/*ARGSUSED*/
static void
SelectChar(Widget w, XtPointer closure _X_UNUSED, XtPointer data)
{
    FontGridCharRec *p = (FontGridCharRec *) data;
    XFontStruct *fs = p->thefont;
    long n = p->thechar;
    int direction, fontascent, fontdescent;
    XCharStruct metrics;
    char buf[256];
    Arg arg;
    Boolean has_char = 1;

    XtSetArg (arg, XtNlabel, buf);

    buf[0] = '\0';
#ifdef XRENDER
    if (p->theface)
    {
	XftFont	*xft = p->theface;
	FcChar32    c = (FcChar32) n;
	has_char = (Boolean) FcCharSetHasChar (xft->charset, n);
	if (has_char)
	{
	    XGlyphInfo	extents;
	    XftTextExtents32 (XtDisplay (w), xft, &c, 1, &extents);
	    snprintf (buf, sizeof(buf), xfd_resources.metrics_format,
		      extents.xOff, - extents.x,
		      extents.xOff - extents.width + extents.x,
		      extents.y, extents.height - extents.y,
		      xft->ascent, xft->descent);
	}
    }
    else
#endif
    {
	if ((!fs->min_byte1 && !fs->max_byte1) ?
	    (n < fs->min_char_or_byte2 || n > fs->max_char_or_byte2) :
	    (n >> 8 < fs->min_byte1 || n >> 8 > fs->max_byte1 ||
	     (n & 0xff)  < fs->min_char_or_byte2 ||
	     (n & 0xff) > fs->max_char_or_byte2))
	{
	    has_char = 0;
	}
	else
	{
	    XChar2b char2b;
	    char2b.byte1 = p->thechar >> 8;
	    char2b.byte2 = p->thechar & 0xff;
	    XTextExtents16 (fs, &char2b, 1, &direction, &fontascent, &fontdescent,
			    &metrics);
	    snprintf (buf, sizeof(buf), xfd_resources.metrics_format,
		      metrics.width, metrics.lbearing, metrics.rbearing,
		      metrics.ascent, metrics.descent, fontascent, fontdescent);
	}
    }
    XtSetValues (metricsLabel, &arg, ONE);

    if (has_char)
    {
	snprintf (buf, sizeof(buf), xfd_resources.select_format,
		  n >> 8, n & 0xff,
		  n >> 8, n & 0xff,
		  n >> 8, n & 0xff);
    }
    else
    {
	snprintf (buf, sizeof(buf), xfd_resources.nochar_format,
		  n >> 8, n & 0xff,
		  n >> 8, n & 0xff,
		  n >> 8, n & 0xff);
    }
    XtSetValues (selectLabel, &arg, ONE);

    return;
}


/*ARGSUSED*/
static void
do_quit (Widget w _X_UNUSED, XEvent *event _X_UNUSED,
	 String *params _X_UNUSED, Cardinal *num_params _X_UNUSED)
{
    exit (0);
}

static void
change_page(int page)
{
    long oldstart, newstart;
    int ncols, nrows;
    Arg arg;

    arg.name = XtNstartChar;
    GetFontGridCellDimensions (fontGrid, &oldstart, &ncols, &nrows);

    if (page) {
	long start = (oldstart +
			   ((long) ncols) * ((long) nrows) * ((long) page));

	arg.value = (XtArgVal) start;
	XtSetValues (fontGrid, &arg, ONE);
    }

    /* find out what it got set to */
    arg.value = (XtArgVal) &newstart;
    XtGetValues (fontGrid, &arg, ONE);

    /* if not paging, then initialize it, else only do it actually changed */
    if (!page || newstart != oldstart) {
	unsigned int row = (unsigned int) ((newstart >> 8));
	unsigned int col = (unsigned int) (newstart & 0xff);
	char buf[256];

	XtSetArg (arg, XtNlabel, buf);
	snprintf (buf, sizeof(buf), xfd_resources.start_format,
		  newstart, row, col);
	XtSetValues (startLabel, &arg, ONE);
    }

    set_button_state ();

    return;
}


static void
set_button_state(void)
{
    Bool prevvalid, nextvalid, prev16valid, next16valid;
    Arg arg;

    GetPrevNextStates (fontGrid, &prevvalid, &nextvalid, &prev16valid, &next16valid);
    arg.name = XtNsensitive;
    arg.value = (XtArgVal) (prevvalid ? TRUE : FALSE);
    XtSetValues (prevButton, &arg, ONE);
    arg.value = (XtArgVal) (nextvalid ? TRUE : FALSE);
    XtSetValues (nextButton, &arg, ONE);
    arg.name = XtNsensitive;
    arg.value = (XtArgVal) (prev16valid ? TRUE : FALSE);
    XtSetValues (prev16Button, &arg, ONE);
    arg.value = (XtArgVal) (next16valid ? TRUE : FALSE);
    XtSetValues (next16Button, &arg, ONE);
}


/* ARGSUSED */
static void
do_prev16(Widget w _X_UNUSED, XEvent *event _X_UNUSED,
	  String *params _X_UNUSED, Cardinal *num_params _X_UNUSED)
{
    change_page (-16);
}


static void
do_prev(Widget w _X_UNUSED, XEvent *event _X_UNUSED,
	String *params _X_UNUSED, Cardinal *num_params _X_UNUSED)
{
    change_page (-1);
}


/* ARGSUSED */
static void
do_next(Widget w _X_UNUSED, XEvent *event _X_UNUSED,
	String *params _X_UNUSED, Cardinal *num_params _X_UNUSED)
{
    change_page (1);
}

/* ARGSUSED */
static void
do_next16(Widget w _X_UNUSED, XEvent *event _X_UNUSED,
	  String *params _X_UNUSED, Cardinal *num_params _X_UNUSED)
{
    change_page (16);
}


static char *
get_font_name(Display *dpy, XFontStruct *fs)
{
    register XFontProp *fp;
    register int i;
    Atom fontatom = XInternAtom (dpy, "FONT", False);

    for (i = 0, fp = fs->properties; i < fs->n_properties; i++, fp++) {
	if (fp->name == fontatom) {
	    return (XGetAtomName (dpy, fp->card32));
	}
    }
    return NULL;
}


static void
CatchFontConversionWarning(String name, String type, String class,
			   String defaultp, String *params, Cardinal *np)
{
    if (np && *np > 1 &&
	strcmp(name, "conversionError") == 0 &&
	strcmp(type, "string") == 0 &&
	strcmp(class, "XtToolkitError") == 0 &&
	strcmp(params[1], "FontStruct") == 0) fontConversionFailed = True;

    (*oldWarningHandler)(name, type, class, defaultp, params, np);
}