/*
 * 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"
#include "fixture_library.h"


static SCM fixture_type;
static SCM fixture_class_type;

SCM fixture_list = SCM_EOL;

struct lightctx *nl = NULL;


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 SCM fixture_class_name(SCM fixture_class_scm)
{
	scm_assert_foreign_object_type(fixture_class_type, fixture_class_scm);
	struct fixture_class *fixture_class = scm_foreign_object_ref(fixture_class_scm, 0);
	return scm_from_utf8_string(fixture_class->name);
}


static SCM patch_fixture(SCM fixture_name_scm, SCM fixture_class_scm,
                         SCM universe_scm, SCM addr_scm)
{
	const int universe = scm_to_int(universe_scm);
	const int addr = scm_to_int(addr_scm);
	struct fixture_class *fixture_class;
	char *fixture_name;
	SCM fixture_string;
	struct fixture *fixture;

	scm_assert_foreign_object_type(fixture_class_type, fixture_class_scm);
	fixture_class = scm_foreign_object_ref(fixture_class_scm, 0);

	if ( !scm_is_symbol(fixture_name_scm) ) return SCM_BOOL_F;
	fixture_string = scm_symbol_to_string(fixture_name_scm);
	fixture_name = scm_to_locale_string(fixture_string);

	fixture = create_fixture(nl, fixture_class, fixture_name, universe, addr, REVERSE_PAN);
	free(fixture_name);

	SCM obj = scm_make_foreign_object_1(fixture_type, fixture);
	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);

	return obj;
}


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


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


void *register_scheme_funcs(void *data)
{
	SCM name, slots;
	SCM obj;
	SCM fixture_class_list;

	nl = data;

	/* Define fixture type */
	name = scm_from_utf8_symbol("fixture");
	slots = scm_list_1(scm_from_utf8_symbol("data"));
	fixture_type = scm_make_foreign_object_type(name, slots, finalize_fixture);

	/* Define fixture class type */
	name = scm_from_utf8_symbol("fixture-class");
	slots = scm_list_1(scm_from_utf8_symbol("data"));
	fixture_class_type = scm_make_foreign_object_type(name, slots, finalize_fixture_class);

	/* Expose the list of fixture classes */
	fixture_class_list = SCM_EOL;

	obj = scm_make_foreign_object_1(fixture_class_type, &dl7s_class);
	fixture_class_list = scm_append(scm_list_2(fixture_class_list, scm_list_1(obj)));

	obj = scm_make_foreign_object_1(fixture_class_type, &generic_dimmer_class);
	fixture_class_list = scm_append(scm_list_2(fixture_class_list, scm_list_1(obj)));

	scm_define(scm_from_utf8_symbol("fixture-class-library"), fixture_class_list);

	/* Expose the list of fixtures (starts empty) */
	scm_define(scm_from_utf8_symbol("fixtures"), fixture_list);

	scm_c_define_gsubr("fixture-name", 1, 0, 0, &fixture_name);
	scm_c_define_gsubr("fixture-class-name", 1, 0, 0, &fixture_class_name);
	scm_c_define_gsubr("set-intensity", 2, 0, 0, &set_intensity);
	scm_c_define_gsubr("patch-fixture", 4, 0, 0, &patch_fixture);

	return NULL;
}


static void run_init()
{
	GBytes *bytes;
	GError *error = NULL;
	gsize size;
	gconstpointer initscm;

	bytes = g_resources_lookup_data("/uk/me/bitwiz/NanoLight/src/init.scm",
	                                 G_RESOURCE_LOOKUP_FLAGS_NONE,
	                                 &error);
	initscm = g_bytes_get_data(bytes, &size);
	scm_c_eval_string(initscm);
	g_bytes_unref(bytes);
}


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