/* Copyright (C) 2026 Reiner Herrmann
 * SPDX-License-Identifier: GPL-3.0-or-later
 */

#include <pebble.h>
#include "config.h"
#include "metronome.h"

struct Configuration {
	uint8_t version;
	uint16_t bpm;
	uint8_t beats;
	uint8_t volume;
	uint8_t beat_indicators;
} __attribute__((__packed__));

#define SETTINGS_KEY 1
#define CONFIG_VERSION 1

static struct Configuration configuration;

static void config_persist() {
	persist_write_data(SETTINGS_KEY, &configuration, sizeof(configuration));
}

static void config_load_defaults() {
	configuration.version = CONFIG_VERSION;
	configuration.bpm = 90;
	configuration.beats = 4;
	configuration.volume = 100;
	configuration.beat_indicators = 0xff;
}

static void config_load() {
	config_load_defaults();

	/* buffer remains unchanged if no data is persisted */
	persist_read_data(SETTINGS_KEY, &configuration, sizeof(configuration));

	if (configuration.version != CONFIG_VERSION) {
		/* unknown persisted configuration format */
		config_load_defaults();
	}
}

static void config_inbox_received_handler(DictionaryIterator *iter, void *context) {
	struct Configuration new_configuration;
	memcpy(&new_configuration, &configuration, sizeof(configuration));

	Tuple *bpm_tuple = dict_find(iter, MESSAGE_KEY_bpm);
	if (bpm_tuple) {
		int32_t bpm = bpm_tuple->value->int32;
		configuration.bpm = (uint16_t) bpm;
	}

	Tuple *beats_tuple = dict_find(iter, MESSAGE_KEY_beats);
	if (beats_tuple) {
		int32_t beats = beats_tuple->value->int32;
		configuration.beats = (uint8_t) beats;
	}

	Tuple *volume_tuple = dict_find(iter, MESSAGE_KEY_volume);
	if (volume_tuple) {
		int32_t volume = volume_tuple->value->int32;
		configuration.volume = (uint8_t) volume;
	}

	const int num_beat_indicators = 3;
	for (int i=0; i<num_beat_indicators; i++) {
		Tuple *beat_indicator = dict_find(iter, MESSAGE_KEY_beat_indicators + i);
		if (beat_indicator) {
			bool val = beat_indicator->value->uint8;
			/* clear bit */
			configuration.beat_indicators &= ~(1 << i);
			/* set value into bit */
			configuration.beat_indicators |= (val << i);
		}
	}

	if (memcmp(&new_configuration, &configuration, sizeof(configuration)) != 0) {
		/* only persist if something changed */
		config_persist();

		update_display();
	}
}

void config_init() {
	config_load();

	app_message_register_inbox_received(config_inbox_received_handler);
	app_message_open(128, 128);
}

void config_deinit() {
	app_message_deregister_callbacks();
}

uint16_t config_get_bpm() {
	return configuration.bpm;
}

void config_set_bpm(uint16_t bpm) {
	configuration.bpm = bpm;
	config_persist();
}

uint8_t config_get_beats() {
	return configuration.beats;
}

void config_set_beats(uint8_t beats) {
	configuration.beats = beats;
	config_persist();
}

uint8_t config_get_volume() {
	return configuration.volume;
}

bool config_is_indicator_enabled(enum BeatIndicator indicator) {
	return configuration.beat_indicators & (1 << indicator);
}