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/* Copyright (C) 2026 Reiner Herrmann
* SPDX-License-Identifier: GPL-3.0-or-later
*/
#include <pebble.h>
#include "config.h"
static Window *metronome_window;
static Layer *draw_layer;
static TextLayer *bpm_text;
static AppTimer *beat_timer;
#define BPM_TO_MS(bpm) (60000/(bpm))
#define IS_FIRST_BEAT() (current_beat % config_get_beats() == 0)
#define COLOR_BG GColorWhite
#define COLOR_BG_INV GColorBlack
#define COLOR_FG GColorBlack
static int current_beat = -1;
static bool playing = true;
static void restore_background_color() {
window_set_background_color(metronome_window, COLOR_BG);
}
static void metronome_flash() {
static const int flash_duration = 50;
if (!config_is_indicator_enabled(FLASHING)) {
return;
}
window_set_background_color(metronome_window, COLOR_BG_INV);
app_timer_register(flash_duration, restore_background_color, NULL);
}
static void metronome_vibrate() {
if (!config_is_indicator_enabled(VIBRATION)) {
return;
}
if (IS_FIRST_BEAT()) {
// TODO: slightly longer pulse
vibes_short_pulse();
} else {
vibes_short_pulse();
}
}
static void metronome_beep() {
#if defined(PBL_SPEAKER)
if (!config_is_indicator_enabled(BEEP) || speaker_is_muted()) {
return;
}
int tone = IS_FIRST_BEAT() ? 880 : 440;
speaker_play_tone(tone, 150, config_get_volume(), SpeakerWaveformSine);
#endif
}
static void beat_timer_callback() {
beat_timer = app_timer_register(BPM_TO_MS(config_get_bpm()), beat_timer_callback, NULL);
current_beat++;
metronome_flash();
metronome_vibrate();
metronome_beep();
layer_mark_dirty(draw_layer);
}
static void update_bpm_text() {
static char bpm_buf[6];
snprintf(bpm_buf, sizeof(bpm_buf), "%d", config_get_bpm());
text_layer_set_text(bpm_text, bpm_buf);
}
static void beat_indicators_update_proc(Layer *layer, GContext *ctx) {
int beats = config_get_beats();
GRect bounds = layer_get_unobstructed_bounds(layer);
const int rect_radius = 10;
const int width = bounds.size.w / beats;
const int height = bounds.size.h;
for (int i=0; i<beats; i++) {
GColor color1, color2;
if (current_beat % (2 * beats) >= beats) {
color1 = GColorGreen;
color2 = GColorOrange;
} else {
color1 = GColorOrange;
color2 = GColorGreen;
}
GRect rect = GRect(5 + (i * width), 10, width - 10, height - 10);
if (current_beat % beats < i) {
graphics_context_set_fill_color(ctx, color1);
} else {
graphics_context_set_fill_color(ctx, color2);
}
graphics_fill_rect(ctx, rect, rect_radius, GCornersAll);
graphics_context_set_stroke_color(ctx, COLOR_FG);
graphics_draw_round_rect(ctx, rect, rect_radius);
}
}
bool is_paused() {
return !playing;
}
void start_metronome() {
beat_timer = app_timer_register(0, beat_timer_callback, NULL);
playing = true;
}
void stop_metronome() {
app_timer_cancel(beat_timer);
playing = false;
}
static void metronome_window_load(Window *window) {
Layer *window_layer = window_get_root_layer(window);
GRect bounds = layer_get_unobstructed_bounds(window_layer);
const int font_height = 38;
/* layer for drawing beat bars */
draw_layer = layer_create(GRect(0, 0, bounds.size.w - ACTION_BAR_WIDTH, bounds.size.h - font_height - 2*20));
layer_set_update_proc(draw_layer, beat_indicators_update_proc);
layer_add_child(window_layer, draw_layer);
/* BPM text */
bpm_text = text_layer_create(GRect(bounds.origin.x, bounds.size.h - font_height - 20, bounds.size.w - ACTION_BAR_WIDTH, font_height));
text_layer_set_background_color(bpm_text, GColorClear);
text_layer_set_text_color(bpm_text, COLOR_FG);
text_layer_set_text_alignment(bpm_text, GTextAlignmentCenter);
text_layer_set_font(bpm_text, fonts_get_system_font(FONT_KEY_LECO_38_BOLD_NUMBERS));
update_bpm_text();
layer_add_child(window_layer, text_layer_get_layer(bpm_text));
start_metronome();
}
static void metronome_window_unload(Window *window) {
text_layer_destroy(bpm_text);
}
Window *create_metronome_window() {
metronome_window = window_create();
window_set_window_handlers(metronome_window, (WindowHandlers) {
.load = metronome_window_load,
.unload = metronome_window_unload,
});
window_set_background_color(metronome_window, COLOR_BG);
return metronome_window;
}
void update_display() {
update_bpm_text();
}
void increase_bpm() {
uint16_t bpm = config_get_bpm();
bpm++;
if (bpm > 600) {
bpm = 600;
}
config_set_bpm(bpm);
APP_LOG(APP_LOG_LEVEL_DEBUG, "increasing bpm to: %d", bpm);
update_bpm_text();
}
void decrease_bpm() {
uint16_t bpm = config_get_bpm();
bpm--;
if (bpm <= 0) {
bpm = 0;
}
config_set_bpm(bpm);
APP_LOG(APP_LOG_LEVEL_DEBUG, "decreasing bpm to: %d", bpm);
update_bpm_text();
}
void increase_beats() {
uint8_t beats = config_get_beats();
beats++;
if (beats > 16) {
beats = 16;
}
config_set_beats(beats);
APP_LOG(APP_LOG_LEVEL_DEBUG, "increasing beats to: %d", beats);
}
void decrease_beats() {
uint8_t beats = config_get_beats();
beats--;
if (beats < 1) {
beats = 1;
}
config_set_beats(beats);
APP_LOG(APP_LOG_LEVEL_DEBUG, "decreasing beats to: %d", beats);
}
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