/*
 * scheme.c
 *
 * Copyright © 2019-2020 Thomas White <taw@bitwiz.me.uk>
 *
 * This file is part of NanoLight.
 *
 * NanoLight 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 3 of the License, 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, see <http://www.gnu.org/licenses/>.
 *
 */


#include <libguile.h>

#include "lightctx.h"


static SCM fixture_type;


static SCM set_intensity(SCM fixture_scm, SCM intensity_scm)
{
	const int intensity = scm_to_int(intensity_scm);

	scm_assert_foreign_object_type(fixture_type, fixture_scm);
	struct fixture *fixture = scm_foreign_object_ref(fixture_scm, 0);

	fixture->v.intensity = (float)intensity/100.0;

	return SCM_UNSPECIFIED;
}


static SCM fixture_name(SCM fixture_scm)
{
	scm_assert_foreign_object_type(fixture_type, fixture_scm);
	struct fixture *fixture = scm_foreign_object_ref(fixture_scm, 0);
	return scm_from_utf8_symbol(fixture->label);
}


static void finalize_fixture(SCM fixture)
{
	printf("finalise fixture!\n");
}


void *register_scheme_funcs(void *data)
{
	struct lightctx *nl = data;
	SCM name, slots;
	int i;
	scm_t_struct_finalize finalizer;
	SCM fixture_list;

	name = scm_from_utf8_symbol("fixture");
	slots = scm_list_1(scm_from_utf8_symbol("data"));
	finalizer = finalize_fixture;
	fixture_type = scm_make_foreign_object_type(name, slots, finalizer);

	fixture_list = SCM_EOL;
	for ( i=0; i<nl->n_fixtures; i++ ) {
		SCM obj = scm_make_foreign_object_1(fixture_type, &nl->fixtures[i]);
		SCM obj_list = scm_list_1(obj);
		fixture_list = scm_append(scm_list_2(fixture_list, obj_list));
	}
	scm_define(scm_from_utf8_symbol("fixtures"), fixture_list);

	scm_c_define_gsubr("fixture-name", 1, 0, 0, &fixture_name);
	scm_c_define_gsubr("set-intensity", 2, 0, 0, &set_intensity);

	return NULL;
}


void *run_repl(void *pargsv)
{
	scm_with_guile(&register_scheme_funcs, pargsv);
	scm_shell(0, NULL);
	return NULL;
}