/*
 * font.c
 *
 * map dvi fonts to X fonts
 */

#include <X11/Xos.h>
#include <X11/IntrinsicP.h>
#include <X11/StringDefs.h>
#include <stdio.h>
#include <ctype.h>
#include "DviP.h"
#include "XFontName.h"

extern char	*malloc ();

static char *
savestr (s)
	char	*s;
{
	char	*n;

	if (!s)
		return 0;
	n = malloc (strlen (s) + 1);
	if (n)
		strcpy (n, s);
	return n;
}

static DviFontList *
LookupFontByPosition (dw, position)
	DviWidget	dw;
	int		position;
{
	DviFontList	*f;

	for (f = dw->dvi.fonts; f; f=f->next)
		if (f->dvi_number == position)
			break;
	return f;
}

static DviFontSizeList *
LookupFontSizeBySize (f, size)
	DviFontList	*f;
	int		size;
{
	DviFontSizeList	*fs, *best = 0;
	int		bestsize = 0;

	for (fs = f->sizes; fs; fs=fs->next) {
		if (fs->size <= size && fs->size >= bestsize) {
			best = fs;
			bestsize = fs->size;
		}
	}
	return best;
}

static char *
SkipFontNameElement (n)
	char	*n;
{
	while (*n != '-')
		if (!*++n)
			return 0;
	return n+1;
}

# define SizePosition		8
# define EncodingPosition	13

static
ConvertFontNameToSize (n)
	char	*n;
{
	int	i, size;

	for (i = 0; i < SizePosition; i++) {
		n = SkipFontNameElement (n);
		if (!n)
			return -1;
	}
	size = atoi (n);
	return size/10;
}

static char *
ConvertFontNameToEncoding (n)
	char	*n;
{
        int i;
	for (i = 0; i < EncodingPosition; i++) {
		n = SkipFontNameElement (n);
		if (!n)
			return 0;
	}
	return n;
}

DviFontSizeList *
InstallFontSizes (dw, x_name)
	DviWidget	dw;
	char		*x_name;
{
	char	fontNameString[2048];
	char	**fonts;
	int	i, count;
	int	size;
	DviFontSizeList	*sizes, *new;
	XFontName	fontName;
	unsigned int	fontNameAttributes;

	if (!XParseFontName (x_name, &fontName, &fontNameAttributes))
		return;
	fontNameAttributes &= ~(FontNamePixelSize|FontNamePointSize);
	fontNameAttributes |= FontNameResolutionX;
	fontNameAttributes |= FontNameResolutionY;
	fontName.ResolutionX = dw->dvi.device_resolution;
	fontName.ResolutionY = dw->dvi.device_resolution;
	XFormatFontName (&fontName, fontNameAttributes, fontNameString);
	fonts = XListFonts (XtDisplay (dw), fontNameString, 10000000, &count);
	sizes = 0;
	for (i = 0; i < count; i++) {
		if ((size = ConvertFontNameToSize (fonts[i])) != -1) {
			new = (DviFontSizeList *) malloc (sizeof *new);
			new->next = sizes;
			new->size = size;
			new->x_name = savestr (fonts[i]);
			new->doesnt_exist = 0;
			new->font = 0;
			sizes = new;
		}
	}
	XFreeFontNames (fonts);
	return sizes;
}

static
DisposeFontSizes (fs)
	DviFontSizeList	*fs;
{
	DviFontSizeList	*next;

	for (; fs; fs=next) {
		next = fs->next;
		if (fs->x_name)
			free (fs->x_name);
		if (fs->font)
			XFree ((char *)fs->font);
		free ((char *) fs);
	}
}

static DviFontList *
InstallFont (dw, position, dvi_name, x_name)
	DviWidget	dw;
	int		position;
	char		*dvi_name;
	char		*x_name;
{
	DviFontList	*f;
	DviFontSizeList	*sizes;
	char		*encoding;

	if (f = LookupFontByPosition (dw, position)) {
		/*
		 * ignore gratuitous font loading
		 */
		if (!strcmp (f->dvi_name, dvi_name) &&
		    !strcmp (f->x_name, x_name))
			return;

		sizes = InstallFontSizes (dw, x_name);
		if (!sizes)
		    return f;

		DisposeFontSizes (f->sizes);
		if (f->dvi_name)
			free (f->dvi_name);
		if (f->x_name)
			free (f->x_name);
	} else {
		sizes = InstallFontSizes (dw, x_name);
		if (!sizes)
		    return 0;
		f = (DviFontList *) malloc (sizeof (*f));
		f->next = dw->dvi.fonts;
		dw->dvi.fonts = f;
	}
	f->dvi_name = savestr (dvi_name);
	f->x_name = savestr (x_name);
	f->dvi_number = position;
	f->sizes = sizes;
	if (f->x_name) {
		encoding = ConvertFontNameToEncoding (f->x_name);
		f->char_map = DviFindMap (encoding);
	} else
		f->char_map = 0;
	/* 
	 * force requery of fonts
	 */
	dw->dvi.font = 0;
	dw->dvi.font_number = -1;
	dw->dvi.cache.font = 0;
	dw->dvi.cache.font_number = -1;
	return f;
}

static char *
MapDviNameToXName (dw, dvi_name)
	DviWidget	dw;
	char		*dvi_name;
{
	DviFontMap	*fm;
	
	for (fm = dw->dvi.font_map; fm; fm=fm->next)
		if (!strcmp (fm->dvi_name, dvi_name))
			return fm->x_name;
	return 0;
}

static char *
MapXNameToDviName (dw, x_name)
	DviWidget	dw;
	char		*x_name;
{
	DviFontMap	*fm;
	
	for (fm = dw->dvi.font_map; fm; fm=fm->next)
		if (!strcmp (fm->x_name, x_name))
			return fm->dvi_name;
	return 0;
}

ParseFontMap (dw)
	DviWidget	dw;
{
	char		dvi_name[1024];
	char		x_name[2048];
	char		*m, *s;
	char		*encoding;
	DviFontMap	*fm, *new;

	if (dw->dvi.font_map)
		DestroyFontMap (dw->dvi.font_map);
	fm = 0;
	m = dw->dvi.font_map_string;
	while (*m) {
		s = m;
		while (*m && !isspace (*m))
			++m;
		strncpy (dvi_name, s, m-s);
		dvi_name[m-s] = '\0';
		while (isspace (*m))
			++m;
		s = m;
		while (*m && *m != '\n')
			++m;
		strncpy (x_name, s, m-s);
		x_name[m-s] = '\0';
		new = (DviFontMap *) malloc (sizeof *new);
		new->x_name = savestr (x_name);
		new->dvi_name = savestr (dvi_name);
		new->next = fm;
		fm = new;
		++m;
	}
	dw->dvi.font_map = fm;
}

DestroyFontMap (font_map)
	DviFontMap	*font_map;
{
	DviFontMap	*next;

	for (; font_map; font_map = next) {
		next = font_map->next;
		if (font_map->x_name)
			free (font_map->x_name);
		if (font_map->dvi_name)
			free (font_map->dvi_name);
		free ((char *) font_map);
	}
}

SetFontPosition (dw, position, dvi_name, extra)
	DviWidget	dw;
	int		position;
	char		*dvi_name;
	char		*extra;	/* unused */
{
	char	*x_name;

	x_name = MapDviNameToXName (dw, dvi_name);
	(void) InstallFont (dw, position, dvi_name, x_name);
}

XFontStruct *
QueryFont (dw, position, size)
	DviWidget	dw;
	int		position;
	int		size;
{
	DviFontList	*f;
	DviFontSizeList	*fs;

	f = LookupFontByPosition (dw, position);
	if (!f)
		return dw->dvi.default_font;
	fs = LookupFontSizeBySize (f, size);
	if (!fs->font) {
		if (fs->x_name)
			fs->font = XLoadQueryFont (XtDisplay (dw), fs->x_name);
		if (!fs->font)
			fs->font = dw->dvi.default_font;
	}
	return fs->font;
}

DviCharNameMap *
QueryFontMap (dw, position)
	DviWidget	dw;
	int		position;
{
	DviFontList	*f;
	char		*encoding;

	f = LookupFontByPosition (dw, position);
	if (f)
	    return f->char_map;
	else
	    return 0;
}

LoadFont (dw, position, size)
	DviWidget	dw;
	int		position;
	int		size;
{
	XFontStruct	*font;

	font = QueryFont (dw, position, size);
	dw->dvi.font_number = position;
	dw->dvi.font_size = size;
	dw->dvi.font = font;
	XSetFont (XtDisplay (dw), dw->dvi.normal_GC, font->fid);
	return;
}