/*
 * LibMorph -- 3d modeler object loader/saver library.
 *
 * Copyright (C) 1999 Kuba Winnicki
 *
 * by Kuba Winnicki <blackwine@optimus.wroc.pl>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Cambridge, MA 02139, USA.
 *
 */

/*
 * This set of IO routines is just a shameless mirror of GdkPixBuf IO code/api
 */

#include <config.h>
#include <stdio.h>
#include <dlfcn.h>
#include <morph.h>

static int
morph_check_lwob( unsigned char* buf, int size )
{
	if( size < 12 )
		return FALSE;

	if(
		buf[  0 ] == 'F' &&
		buf[  1 ] == 'O' &&
		buf[  2 ] == 'R' &&
		buf[  3 ] == 'M' &&
		buf[  8 ] == 'L' &&
		buf[  9 ] == 'W' &&
		buf[ 10 ] == 'O' &&
		buf[ 11 ] == 'B'
	)
		return TRUE;

	return FALSE;
}

static int
morph_check_3ds( unsigned char* buf, int size )
{
	if( size < 6 )
		return FALSE;

	if( *( short* )buf == 0x4d4d )
		return TRUE;

	return FALSE;
}

static struct {
	unsigned char*	module_name;
	void*		module;
	int		( * check_format )( unsigned char* buf, int size ); // boolean
	MorphModel*	( * load )( FILE* f, ... );  // ... opt enums
	int		( * save )( MorphModel* m, ... );
} morph_file_formats[] = {
	{ "lwob", NULL, morph_check_lwob, NULL, NULL },
	{ "a3ds", NULL, morph_check_3ds, NULL, NULL },
/*	{ "awv", NULL, morph_check_, NULL, NULL },
	{ "maya", NULL, morph_check_maya, NULL, NULL },
	{ "simg", NULL, morph_check_, NULL, NULL },
	{ "vrml", NULL, morph_check_vrml, NULL, NULL },
*/	{ NULL, NULL, NULL, NULL, NULL }
};

/* FIXME --	1. generally
 * 		2. where is dlclose?
 */

static void
morph_model_handler_load( int idx )
{
	unsigned char	module_name[ 100 ];	//FIXME
	//unsigned char*		path;
	void*		module,
	    *		load_sym,
	    *		save_sym;

	//path = g_module_build_path( LIBMORPH_LIBDIR, module_name );

	sprintf(
		module_name,
		"%s/libmorph-%s.so",
		MORPH_LIBDIR,
		morph_file_formats[ idx ].module_name
	);

	module = dlopen( module_name, RTLD_LAZY );

	if( !module ) {
		fprintf( stderr, "Unable to load module: %s\n", module );
		fflush( stderr );
		return;
	}

	morph_file_formats[ idx ].module = module;

	morph_file_formats[ idx ].load = dlsym( module, "load_model" );
	morph_file_formats[ idx ].save = dlsym( module, "save_model" );
}

MorphModel*
morph_model_load( const char* filename )
{
	MorphModel*	m;
	FILE*		f;
	int		n, i;
	unsigned char	buf[ 128 ];

	f = fopen( filename, "r" );
	if( !f )
		return NULL;

	n = fread( &buf, 1, sizeof( buf ), f );

	if( !n ) {
		fclose( f );
		return NULL;
	}

	for( i = 0; morph_file_formats[ i ].module_name; i++ ) {
		if( ( *morph_file_formats[ i ].check_format )( buf, 12 ) ) {
			if( !morph_file_formats[ i ].load )
				morph_model_handler_load( i );

			if( !morph_file_formats[ i ].load ) {
				fclose( f );
				return NULL;
			}

			fseek( f, 0, SEEK_SET );
			m = ( *morph_file_formats[ i ].load )( f );

			m->surfaces[ 0 ].color[ 0 ]	= 0xff;
			m->surfaces[ 0 ].color[ 1 ]	= 0xff;
			m->surfaces[ 0 ].color[ 2 ]	= 0xff;
			m->surfaces[ 0 ].color[ 3 ]	= 0xff;
			m->surfaces[ 0 ].diffuse	= 1.0;
			m->surfaces[ 0 ].specular	= 1.0;
			m->surfaces[ 0 ].specular_exp	= 128;

			fclose( f );
			//g_assert( obj->ref_count != 0 ); // what's that?
			return m;
		}
	}

	fclose( f );

	fprintf( stderr, "Can't find handler for %s\n", filename );
	return NULL;
}