/*
 * Copyright 2005 James Bursa <bursa@users.sourceforge.net>
 *           2008 Vincent Sanders <vince@simtec.co.uk>
 *			 2011 Ole Loots <ole@monochrom.net>
 * This file is part of NetSurf, http://www.netsurf-browser.org/
 *
 * NetSurf is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * NetSurf is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifdef WITH_FREETYPE_FONT_DRIVER
#include <ft2build.h>
#include FT_CACHE_H

#include "atari/plot/plotter.h"
#include "atari/plot/font_freetype.h"


#define DEJAVU_PATH "/usr/share/fonts/truetype/ttf-dejavu/"

static FT_Library library;
static FTC_Manager ft_cmanager;
static FTC_CMapCache ft_cmap_cache ;
static FTC_ImageCache ft_image_cache;

int ft_load_type;

/* cache manager faceID data to create freetype faceid on demand */
typedef struct ftc_faceid_s {
        char *fontfile; /* path to font */
        int index; /* index of font */
        int cidx; /* character map index for unicode */
} ftc_faceid_t;

static struct bitmap * fontbmp;

static ftc_faceid_t *font_faces[FONT_FACE_COUNT];

static int dtor( FONT_PLOTTER self );
static int str_width( FONT_PLOTTER self,const plot_font_style_t *fstyle,
						const char * str, size_t length, int * width  );
static int str_split( FONT_PLOTTER self, const plot_font_style_t *fstyle,
						const char *string, size_t length,int x,
						size_t *char_offset, int *actual_x );
static int pixel_pos( FONT_PLOTTER self, const plot_font_style_t *fstyle,
							const char *string, size_t length,int x,
							size_t *char_offset, int *actual_x );
static int text( FONT_PLOTTER self,  int x, int y, const char *text,
					size_t length, const plot_font_style_t *fstyle );

static void draw_glyph8(FONT_PLOTTER self, GRECT * loc, uint8_t * pixdata,
						int pitch, uint32_t colour);
static void draw_glyph1(FONT_PLOTTER self, GRECT * loc, uint8_t * pixdata,
						int pitch, uint32_t colour);

static MFDB tmp;
static int tmp_mfdb_size;
static bool init = false;



/* map cache manager handle to face id */
static FT_Error ft_face_requester(FTC_FaceID face_id, FT_Library  library, FT_Pointer request_data, FT_Face *face )
{
	FT_Error error;
	ftc_faceid_t *ft_face = (ftc_faceid_t *)face_id;
	int cidx;

	error = FT_New_Face(library, ft_face->fontfile, ft_face->index, face);
	if (error) {
		LOG(("Could not find font (code %d)\n", error));
	} else {
		error = FT_Select_Charmap(*face, FT_ENCODING_UNICODE);
		if (error) {
			LOG(("Could not select charmap (code %d)\n", error));
		} else {
			for (cidx = 0; cidx < (*face)->num_charmaps; cidx++) {
				if ((*face)->charmap == (*face)->charmaps[cidx]) {
					ft_face->cidx = cidx;
					break;
				}
			}
		}
	}
	LOG(("Loaded face from %s\n", ft_face->fontfile));
	return error;
}

/* create new framebuffer face and cause it to be loaded to check its ok */
static ftc_faceid_t *
ft_new_face(const char *option, const char *resname, const char *fontfile)
{
	ftc_faceid_t *newf;
	FT_Error error;
	FT_Face aface;
	char buf[PATH_MAX];

	newf = calloc(1, sizeof(ftc_faceid_t));
	if (option != NULL) {
		newf->fontfile = strdup(option);
	} else {
		atari_find_resource(buf, resname, fontfile);
		newf->fontfile = strdup(buf);
	}
	error = FTC_Manager_LookupFace(ft_cmanager, (FTC_FaceID)newf, &aface);
	if (error) {
		LOG(("Could not find font face %s (code %d)\n", fontfile, error));
		free(newf);
		newf = font_faces[FONT_FACE_DEFAULT]; /* use default */
	}
	return newf;
}

static void ft_fill_scalar(const plot_font_style_t *fstyle, FTC_Scaler srec)
{
	int selected_face = FONT_FACE_DEFAULT;

	switch (fstyle->family) {
/*
	case PLOT_FONT_FAMILY_CURSIVE:
		break;
	case PLOT_FONT_FAMILY_FANTASY:
		break;
*/
	case PLOT_FONT_FAMILY_SERIF:
		if (fstyle->weight >= 700)
			selected_face = FONT_FACE_SERIF_BOLD;
		else
			selected_face = FONT_FACE_SERIF;

		break;

	case PLOT_FONT_FAMILY_MONOSPACE:
			selected_face = FONT_FACE_MONOSPACE;
		break;

	case PLOT_FONT_FAMILY_SANS_SERIF:
	default:
		if ((fstyle->flags & FONTF_ITALIC) || (fstyle->flags & FONTF_OBLIQUE)) {
			if (fstyle->weight >= 700)
				selected_face = FONT_FACE_SANS_SERIF_ITALIC_BOLD;
			else
				selected_face = FONT_FACE_SANS_SERIF_ITALIC;
		} else {
			if (fstyle->weight >= 700)
				selected_face = FONT_FACE_SANS_SERIF_BOLD;
			else
				selected_face = FONT_FACE_SANS_SERIF;
		}
	}

	srec->face_id = (FTC_FaceID)font_faces[selected_face];
	srec->width = srec->height = (fstyle->size * 64) / FONT_SIZE_SCALE;
	srec->pixel = 0;
	srec->x_res = srec->y_res = 72;
}

static FT_Glyph ft_getglyph(const plot_font_style_t *fstyle, uint32_t ucs4)
{
	FT_UInt glyph_index;
	FTC_ScalerRec srec;
	FT_Glyph glyph;
	FT_Error error;
	ftc_faceid_t *ft_face;

	ft_fill_scalar(fstyle, &srec);
	ft_face = (ftc_faceid_t *)srec.face_id;
	glyph_index = FTC_CMapCache_Lookup(ft_cmap_cache, srec.face_id, ft_face->cidx, ucs4);
	error = FTC_ImageCache_LookupScaler(ft_image_cache,
                                            &srec,
                                            FT_LOAD_RENDER |
                                            FT_LOAD_FORCE_AUTOHINT |
                                            ft_load_type,
                                            glyph_index,
                                            &glyph,
                                            NULL);
	return glyph;
}



/* initialise font handling */
static bool ft_font_init(void)
{
	FT_Error error;
	FT_ULong max_cache_size;
	FT_UInt max_faces = 6;

	/* freetype library initialise */
	error = FT_Init_FreeType( &library );
	if (error) {
                LOG(("Freetype could not initialised (code %d)\n", error));
                return false;
	}

	max_cache_size = 2 * 1024 *1024; /* 2MB should be enough */

	/* cache manager initialise */
	error = FTC_Manager_New(library,
                                max_faces,
                                0,
                                max_cache_size,
                                ft_face_requester,
                                NULL,
                                &ft_cmanager);
	if (error) {
		LOG(("Freetype could not initialise cache manager (code %d)\n", error));
		FT_Done_FreeType(library);
		return false;
	}

	error = FTC_CMapCache_New(ft_cmanager, &ft_cmap_cache);
	error = FTC_ImageCache_New(ft_cmanager, &ft_image_cache);

	font_faces[FONT_FACE_SANS_SERIF] = NULL;
	font_faces[FONT_FACE_SANS_SERIF] = ft_new_face(
											option_atari_face_sans_serif,
                            				"fonts/ss.ttf",
                            				DEJAVU_PATH"DejaVuSans.ttf"
										);
	if (font_faces[FONT_FACE_SANS_SERIF] == NULL) {
                LOG(("Could not find default font (code %d)\n", error));
                FTC_Manager_Done(ft_cmanager );
                FT_Done_FreeType(library);
                return false;
	}

	font_faces[FONT_FACE_SANS_SERIF_BOLD] =
		ft_new_face(option_atari_face_sans_serif_bold,
                            "fonts/ssb.ttf",
                            DEJAVU_PATH"DejaVuSans-Bold.ttf");

	font_faces[FONT_FACE_SANS_SERIF_ITALIC] =
		ft_new_face(option_atari_face_sans_serif_italic,
                            "fonts/ssi.ttf",
                            DEJAVU_PATH"DejaVuSans-Oblique.ttf");

	font_faces[FONT_FACE_SANS_SERIF_ITALIC_BOLD] =
		ft_new_face(option_atari_face_sans_serif_italic_bold,
                            "fonts/ssib.ttf",
                            DEJAVU_PATH"DejaVuSans-BoldOblique.ttf");

	font_faces[FONT_FACE_MONOSPACE] =
		ft_new_face(option_atari_face_monospace,
                            "fonts/mono.ttf",
                            DEJAVU_PATH"DejaVuSansMono.ttf");

	font_faces[FONT_FACE_MONOSPACE_BOLD] =
		ft_new_face(option_atari_face_monospace_bold,
                            "fonts/monob.ttf",
                            DEJAVU_PATH"DejaVuSansMono-Bold.ttf");

	font_faces[FONT_FACE_SERIF] =
		ft_new_face(option_atari_face_serif,
                            "fonts/s.ttf",
                            DEJAVU_PATH"DejaVuSerif.ttf");

	font_faces[FONT_FACE_SERIF_BOLD] =
		ft_new_face(option_atari_face_serif_bold,
                            "fonts/sb.ttf",
                            DEJAVU_PATH"DejaVuSerif-Bold.ttf");

	font_faces[FONT_FACE_CURSIVE] =
		ft_new_face(option_atari_face_cursive,
                            "fonts/cursive.ttf",
                            DEJAVU_PATH"DejaVuSansMono-Oblique.ttf");

	font_faces[FONT_FACE_FANTASY] =
		ft_new_face(option_atari_face_fantasy,
                            "fonts/fantasy.ttf",
                            DEJAVU_PATH"DejaVuSerifCondensed-Bold.ttf");

	return true;
}


static bool ft_font_finalise(void)
{
	FTC_Manager_Done(ft_cmanager );
	FT_Done_FreeType(library);
	return true;
}

static int str_width( FONT_PLOTTER self,const plot_font_style_t *fstyle,
                         const char *string, size_t length,
                         int *width)
{
	uint32_t ucs4;
	size_t nxtchr = 0;
	FT_Glyph glyph;

	*width = 0;
	while (nxtchr < length) {
		ucs4 = utf8_to_ucs4(string + nxtchr, length - nxtchr);
		nxtchr = utf8_next(string, length, nxtchr);

		glyph = ft_getglyph(fstyle, ucs4);
		if (glyph == NULL)
			continue;
		*width += glyph->advance.x >> 16;
	}
	return(1);
}


static int str_split( FONT_PLOTTER self, const plot_font_style_t *fstyle,
		const char *string, size_t length,
		int x, size_t *char_offset, int *actual_x)
{
	uint32_t ucs4;
	size_t nxtchr = 0;
	int last_space_x = 0;
	int last_space_idx = 0;
	FT_Glyph glyph;

	*actual_x = 0;
	while (nxtchr < length) {
		ucs4 = utf8_to_ucs4(string + nxtchr, length - nxtchr);
      glyph = ft_getglyph(fstyle, ucs4);
      if (glyph == NULL)
			continue;
		if (ucs4 == 0x20) {
			last_space_x = *actual_x;
			last_space_idx = nxtchr;
		}
		*actual_x += glyph->advance.x >> 16;
		if (*actual_x > x) {
			/* string has exceeded available width return previous space*/
			*actual_x = last_space_x;
			*char_offset = last_space_idx;
			return true;
		}
		nxtchr = utf8_next(string, length, nxtchr);
	}
	*char_offset = nxtchr;
	return (1);
}


static int pixel_pos( FONT_PLOTTER self, const plot_font_style_t *fstyle,
		const char *string, size_t length,
		int x, size_t *char_offset, int *actual_x)
{
	uint32_t ucs4;
	size_t nxtchr = 0;
	FT_Glyph glyph;

	*actual_x = 0;
	while (nxtchr < length) {
		ucs4 = utf8_to_ucs4(string + nxtchr, length - nxtchr);
		glyph = ft_getglyph(fstyle, ucs4);
		if (glyph == NULL)
			continue;
			*actual_x += glyph->advance.x >> 16;
			if (*actual_x > x)
				break;
			nxtchr = utf8_next(string, length, nxtchr);
	}
   *char_offset = nxtchr;
	return ( 1 );
}


static void draw_glyph8(FONT_PLOTTER self, GRECT * loc, uint8_t * pixdata, int pitch, uint32_t colour)
{
	GRECT clip;
	uint32_t * linebuf;
	uint32_t fontpix;
	size_t bmpstride;
	int xloop,yloop,xoff,yoff;
	int x,y,w,h;

	x = loc->g_x;
	y = loc->g_y;
	w = loc->g_w;
	h = loc->g_h;

	clip.g_x = self->plotter->clipping.x0;
	clip.g_y = self->plotter->clipping.y0;
	clip.g_w = (self->plotter->clipping.x1 - self->plotter->clipping.x0)+1;
	clip.g_h = (self->plotter->clipping.y1 - self->plotter->clipping.y0)+1;

	if( !rc_intersect( &clip, loc ) ){
		return;
	}

	assert( loc->g_w > 0 );
	assert( loc->g_h > 0 );
	xoff = loc->g_x - x;
	yoff = loc->g_y - y;

	if (h > loc->g_h)
		h = loc->g_h;

	if (w > loc->g_w)
		w = loc->g_w;
	fontbmp = bitmap_realloc( w, h,
				fontbmp->bpp, w * fontbmp->bpp,
				BITMAP_GROW, fontbmp );
	assert( fontbmp );
	assert( fontbmp->pixdata );
	bmpstride = bitmap_get_rowstride(fontbmp);
	for( yloop = 0; yloop < h; yloop++) {
		linebuf = (uint32_t *)(fontbmp->pixdata + (bmpstride * yloop));
		for(xloop = 0; xloop < w; xloop++){
			fontpix = (uint32_t)(pixdata[(( yoff + yloop ) * pitch) + xloop + xoff]);
			linebuf[xloop] = (uint32_t)(colour | fontpix);
		}
	}
	self->plotter->bitmap( self->plotter, fontbmp, loc->g_x, loc->g_y, 0, 0);
}

static void draw_glyph1(FONT_PLOTTER self, GRECT * loc, uint8_t * pixdata, int pitch, uint32_t colour)
{
	GRECT clip;
	int xloop,yloop,xoff,yoff;
	int x,y,w,h;
	uint8_t bitm;
    const uint8_t *fntd;

	x = loc->g_x;
	y = loc->g_y;
	w = loc->g_w;
	h = loc->g_h;

	clip.g_x = self->plotter->clipping.x0;
	clip.g_y = self->plotter->clipping.y0;
	clip.g_w = (self->plotter->clipping.x1 - self->plotter->clipping.x0)+1;
	clip.g_h = (self->plotter->clipping.y1 - self->plotter->clipping.y0)+1;

	if( !rc_intersect( &clip, loc ) ){
		return;
	}

	assert( loc->g_w > 0 );
	assert( loc->g_h > 0 );
	xoff = loc->g_x - x;
	yoff = loc->g_y - y;

	if (h > loc->g_h)
		h = loc->g_h;

	if (w > loc->g_w)
		w = loc->g_w;

	int stride = MFDB_STRIDE( w );
	if( tmp.fd_addr == NULL || tmp_mfdb_size < MFDB_SIZE( 1, stride, h) ){
		tmp_mfdb_size = init_mfdb( 1, w, h,  MFDB_FLAG_STAND | MFDB_FLAG_ZEROMEM, &tmp );
	} else {
		void * buf = tmp.fd_addr;
		int size = init_mfdb( 1, w, h,  MFDB_FLAG_STAND | MFDB_FLAG_NOALLOC, &tmp );
		tmp.fd_addr = buf;
		memset( tmp.fd_addr, 0, size );
	}
	short * buf;
	for( yloop = 0; yloop < h; yloop++) {
		fntd = pixdata + (pitch * (yloop+yoff))+(xoff>>3);
		buf = tmp.fd_addr;
		buf += (tmp.fd_wdwidth*yloop);
		for ( xloop = 0, bitm = (1<<(7-(xoff%8))); xloop < w; xloop++, bitm=(bitm>>1) ) {
				if( (*fntd & bitm) != 0 ){
					short whichbit = (1<<(15-(xloop%16)));
					buf[xloop>>4] = ((buf[xloop>>4])|(whichbit));
				}
				if( bitm == 1 ) {
					fntd++;
					bitm = 128;
				}
		}
	}
#ifdef WITH_8BPP_SUPPORT
	if( app.nplanes > 8 ){
#endif
		unsigned short out[4];
		rgb_to_vdi1000( (unsigned char*)&colour, (unsigned short*)&out );
		vs_color( self->plotter->vdi_handle, OFFSET_CUSTOM_COLOR, (unsigned short*)&out[0] );
		self->plotter->plot_mfdb( self->plotter, loc, &tmp, OFFSET_CUSTOM_COLOR, PLOT_FLAG_TRANS );
#ifdef WITH_8BPP_SUPPORT
	} else {
		unsigned char c = RGB_TO_VDI(colour);
		self->plotter->plot_mfdb( self->plotter, loc, &tmp, c, PLOT_FLAG_TRANS );
	}
#endif

}




static int text( FONT_PLOTTER self,  int x, int y, const char *text, size_t length,
				 const plot_font_style_t *fstyle )
{
	uint32_t ucs4;
	size_t nxtchr = 0;
	FT_Glyph glyph;
	FT_BitmapGlyph bglyph;
	GRECT loc;
	uint32_t c = fstyle->foreground ;
	/* in -> BGR */
	/* out -> ARGB */
	if( !(self->flags & FONTPLOT_FLAG_MONOGLYPH) )
		c = ABGR_TO_RGB(c);

	while (nxtchr < length) {
		ucs4 = utf8_to_ucs4(text + nxtchr, length - nxtchr);
		nxtchr = utf8_next(text, length, nxtchr);

		glyph = ft_getglyph(fstyle, ucs4);
		if (glyph == NULL){
			continue;
		}

		if (glyph->format == FT_GLYPH_FORMAT_BITMAP) {
				bglyph = (FT_BitmapGlyph)glyph;
				loc.g_x = x + bglyph->left;
				loc.g_y = y - bglyph->top;
				loc.g_w = bglyph->bitmap.width;
				loc.g_h = bglyph->bitmap.rows;

				if( loc.g_w > 0) {
					self->draw_glyph( self,
						&loc,
						bglyph->bitmap.buffer,
						bglyph->bitmap.pitch,
						c
					);
				}
		}
		x += glyph->advance.x >> 16;

	}
	return( 0 );
}


int ctor_font_plotter_freetype( FONT_PLOTTER self )
{
	self->dtor = dtor;
	self->str_width = str_width;
	self->str_split = str_split;
	self->pixel_pos = pixel_pos;
	self->text = text;

	/* set the default render mode */
	if( (self->flags & FONTPLOT_FLAG_MONOGLYPH) != 0 ){
		ft_load_type = FT_LOAD_MONOCHROME;
		self->draw_glyph = draw_glyph1;
	}
	else{
		ft_load_type = 0;
		self->draw_glyph = draw_glyph8;
	}

	LOG(("%s: %s\n", (char*)__FILE__, __FUNCTION__));
	if( !init ) {
		ft_font_init();
		fontbmp = bitmap_create(48, 48, 0);
		fontbmp->opaque = false;
		init = true;
	}

	return( 1 );
}

static int dtor( FONT_PLOTTER self )
{
	ft_font_finalise();
	if( fontbmp == NULL )
		bitmap_destroy( fontbmp );

	if( tmp.fd_addr != NULL ){
		free( tmp.fd_addr );
	}
	return( 1 );
}

#endif
