#define BUZZER_PIN 7
#define TM1637_DIO 4
#define TM1637_CLK 5
#define BUTTON_PIN 2
#define POT_PIN A7
#define BT_RX 8
#define BT_TX 9

LiquidCrystal_I2C lcd(0x27, 16, 2);
RTC_DS3231 rtc;
TM1637Display display(TM1637_CLK, TM1637_DIO);
SoftwareSerial btSerial(BT_RX, BT_TX);
RDA5807M radio;

volatile bool alarmTriggered = false;
int alarmHour = 8, alarmMinute = 0;
bool alarmActive = false;
unsigned long lastBeepTime = 0;
bool buzzerState = false;

void IRAM_ATTR handleButton() {

alarmActive = false;  \\
digitalWrite(BUZZER_PIN, LOW);  \\
lcd.setCursor(0, 1);  \\
lcd.print("Alarma oprita!   ");  \\

}

void setup() {

pinMode(BUZZER_PIN, OUTPUT);
pinMode(BUTTON_PIN, INPUT_PULLUP);

attachInterrupt(digitalPinToInterrupt(BUTTON_PIN), handleButton, FALLING);

Serial.begin(9600);
btSerial.begin(9600);

Wire.begin();
lcd.init(); lcd.backlight();
rtc.begin();
display.setBrightness(0x0f);
radio.init();
radio.setFrequency(10390);

lcd.setCursor(0, 0);
lcd.print("Ceas multi-lab!");

}

void loop() {

DateTime now = rtc.now();
int hh = now.hour();
int mm = now.minute();
int ss = now.second();

int timeVal = hh * 100 + mm;
display.showNumberDecEx(timeVal, 0b01000000, true);

if (Serial.available()) {
  String cmd = Serial.readStringUntil('\n');
  handleCommand(cmd);
}
if (btSerial.available()) {
  String cmd = btSerial.readStringUntil('\n');
  handleCommand(cmd);
}

if (alarmActive) {
  unsigned long t = millis();
  if (t - lastBeepTime > 300) {
    buzzerState = !buzzerState;
    analogWrite(BUZZER_PIN, buzzerState ? 180 : 0);
    lastBeepTime = t;
  }
  lcd.setCursor(0, 1);
  lcd.print("ALARMA!       ");
} else {
  digitalWrite(BUZZER_PIN, LOW);
}

lcd.setCursor(0, 0);
lcd.printf("%02d:%02d:%02d T:%.1f ", hh, mm, ss, temp);

if (!alarmActive && hh == alarmHour && mm == alarmMinute && ss == 0) {
  alarmActive = true;
}

delay(50);

}

void handleCommand(String cmd) {

cmd.trim();  \\
if (cmd.startsWith("ALARM ")) {  \\
  int sep = cmd.indexOf(':');  \\
  if (sep > 0) {  \\
    alarmHour = cmd.substring(6, sep).toInt();  \\
    alarmMinute = cmd.substring(sep+1).toInt();  \\
    Serial.println("Setat alarma la " + String(alarmHour) + ":" + String(alarmMinute));  \\
    btSerial.println("Setat alarma la " + String(alarmHour) + ":" + String(alarmMinute));  \\
  }  \\
} else if (cmd.startsWith("RADIO ")) {  \\
  float freq = cmd.substring(6).toFloat() / 100;  \\
  radio.setFrequency(freq);  \\
  Serial.println("Radio: " + String(freq, 2));  \\
  btSerial.println("Radio: " + String(freq, 2));  \\
}  \\

}