/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8; c-indent-level: 8 -*- */
/*
 *  Copyright (C) 2005, Red Hat, Inc. 
 *
 *  This program 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; either version 2, or (at your option)
 *  any later version.
 *
 *  This program 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, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 */

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

#include "ev-document-factory.h"

/* The various document type backends: */
#include "ev-poppler.h"
#include "pixbuf-document.h"
#include "tiff-document.h"
#include "ps-document.h"
#ifdef ENABLE_DVI
#include "dvi-document.h"
#endif
#ifdef ENABLE_DJVU
#include "djvu-document.h"
#endif

#include <string.h>

typedef struct _EvDocumentType EvDocumentType;
struct _EvDocumentType
{
	const char *mime_type;
	EvBackend backend;
	GType (*document_type_factory_callback)();
};

const EvDocumentType document_types[] = {
	/* PDF: */
	{"application/pdf",            EV_BACKEND_PDF,  pdf_document_get_type},

	/* Postscript: */
	{"application/postscript",     EV_BACKEND_PS,   ps_document_get_type},
	{"application/x-gzpostscript", EV_BACKEND_PS,   ps_document_get_type},
	{"image/x-eps",                EV_BACKEND_PS,   ps_document_get_type},

#ifdef ENABLE_TIFF
	/* Tiff: */
	{"image/tiff",                 EV_BACKEND_TIFF, tiff_document_get_type},
#endif

#ifdef ENABLE_DJVU
	/* djvu: */
	{"image/vnd.djvu",             EV_BACKEND_DJVU, djvu_document_get_type},
#endif		

#ifdef ENABLE_DVI
	/* dvi: */
	{"application/x-dvi",          EV_BACKEND_DVI,  dvi_document_get_type},
#endif
};

#ifdef ENABLE_PIXBUF
/* Would be nice to have this in gdk-pixbuf */
static gboolean
mime_type_supported_by_gdk_pixbuf (const gchar *mime_type)
{
	GSList *formats, *list;
	gboolean retval = FALSE;

	formats = gdk_pixbuf_get_formats ();

	list = formats;
	while (list) {
		GdkPixbufFormat *format = list->data;
		int i;
		gchar **mime_types;

		if (gdk_pixbuf_format_is_disabled (format))
			continue;

		mime_types = gdk_pixbuf_format_get_mime_types (format);

		for (i = 0; mime_types[i] != NULL; i++) {
			if (strcmp (mime_types[i], mime_type) == 0) {
				retval = TRUE;
				break;
			}
		}

		if (retval)
			break;

		list = list->next;
	}

	g_slist_free (formats);

	return retval;
}
#endif

static GType
ev_document_type_get_from_mime (const char *mime_type)
{
	int i;
	
	g_return_val_if_fail (mime_type, G_TYPE_INVALID);

	for (i = 0; i < G_N_ELEMENTS (document_types); i++) {
		if (strcmp (mime_type, document_types[i].mime_type) == 0) {
			g_assert (document_types[i].document_type_factory_callback != NULL);
			return document_types[i].document_type_factory_callback();
		}
	}
#ifdef ENABLE_PIXBUF
	if (mime_type_supported_by_gdk_pixbuf (mime_type)) {
		return pixbuf_document_get_type ();
	}
#endif

	return G_TYPE_INVALID;
}

EvDocument *
ev_document_factory_get_document (const char *mime_type)
{
	GType type = G_TYPE_INVALID;
	
	type = ev_document_type_get_from_mime (mime_type);

	if (type != G_TYPE_INVALID) {
		return g_object_new (type, NULL);
	}
		
	return NULL;
}

EvBackend
ev_document_factory_get_backend (EvDocument *document)
{
	int i;

	for (i = 0; i < G_N_ELEMENTS (document_types); i++) {
		GType type = document_types[i].document_type_factory_callback ();
		if (type == G_TYPE_FROM_INSTANCE (document)) {
			return  document_types[i].backend;
		}
	}

	g_assert_not_reached ();
	
	return 0;
}

GList *
ev_document_factory_get_mime_types (EvBackend backend)
{
	GList *types = NULL;
	int i;
	
	for (i = 0; i < G_N_ELEMENTS (document_types); i++) {
		if (document_types[i].backend == backend) {
			types = g_list_append (types, g_strdup (document_types[i].mime_type));
		}
	}

	return types;
}

GList *
ev_document_factory_get_all_mime_types (void)
{
	GList *types = NULL;
	int i;
	
	for (i = 0; i < G_N_ELEMENTS (document_types); i++) {
		types = g_list_append (types, g_strdup (document_types[i].mime_type));
	}

	return types;
}