#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <Servo.h>

// I2C LCD Adresse (häufig 0x27 oder 0x3F, überprüfe die Adresse deines Moduls)
LiquidCrystal_I2C lcd(0x27, 16, 2);

// Servo Motor Pin
const int servoPin = 3;
Servo myservo;

// Button Pins
const int blueButton = 7;
const int yellowButton = 8;
const int greenButton = 2;
const int redButton = 4;

// Zeitvariablen
int hours = 0;
int minutes = 0;
int seconds = 0;

// Statusvariablen
bool isCountingDown = false;
bool isServoMoving = false;

// Setup-Funktion
void setup() {
  lcd.init();
  lcd.backlight();
  updateDisplay();

  pinMode(blueButton, INPUT_PULLUP);
  pinMode(yellowButton, INPUT_PULLUP);
  pinMode(greenButton, INPUT_PULLUP);
  pinMode(redButton, INPUT_PULLUP);

  myservo.attach(servoPin);
  myservo.write(0); // Anfangsposition des Servos
}

// Hauptschleife
void loop() {
  if (!isCountingDown && !isServoMoving) {
    handleButtonPress();
  } else if (isCountingDown && !isServoMoving) {
    if (digitalRead(redButton) == LOW) {
      isCountingDown = false;
      isServoMoving = true;
      myservo.write(90);
      delay(500); // Warten, bis der Servo sich bewegt hat
      showEndMessageAndResetTime();
    }
  }
}

// Button-Eingaben verarbeiten
void handleButtonPress() {
  if (digitalRead(blueButton) == LOW) {
    adjustTime(-30);
    updateDisplay();
    delay(200);
  }
  if (digitalRead(yellowButton) == LOW) {
    adjustTime(30);
    updateDisplay();
    delay(200);
  }
  if (digitalRead(greenButton) == LOW) {
    isCountingDown = true;
    countdown();
  }
}

// Zeit anpassen (in Minuten)
void adjustTime(int minutesToAdd) {
  minutes += minutesToAdd;
  while (minutes >= 60) {
    minutes -= 60;
    hours++;
  }
  while (minutes < 0) {
    minutes += 60;
    hours = max(0, hours - 1);
  }
}

// Display aktualisieren
void updateDisplay() {
  lcd.clear();
  lcd.print("Time: ");
  lcd.print(formatTime(hours) + ":" + formatTime(minutes) + ":" + formatTime(seconds));
}

// Zeitformatierung (hh:mm:ss)
String formatTime(int timeUnit) {
  return (timeUnit < 10) ? "0" + String(timeUnit) : String(timeUnit);
}

// Countdown-Funktion
void countdown() {
  while ((hours > 0 || minutes > 0 || seconds > 0) && isCountingDown) {
    delay(1000);
    decreaseSeconds();
    updateDisplay();
    if (digitalRead(redButton) == LOW) {
      isCountingDown = false;
      isServoMoving = true;
      myservo.write(90);
      delay(500); // Warten, bis der Servo sich bewegt hat
      showEndMessageAndResetTime();
      return;
    }
  }
  if (hours == 0 && minutes == 0 && seconds == 0) {
    isServoMoving = true;
    myservo.write(90); // Servo bewegen, wenn die Zeit abgelaufen ist
    delay(500); // Warten, bis der Servo sich bewegt hat
    showEndMessageAndResetTime();
  }
}

// Sekunden verringern
void decreaseSeconds() {
  if (seconds > 0) {
    seconds--;
  } else {
    if (minutes > 0) {
      minutes--;
      seconds = 59;
    } else if (hours > 0) {
      hours--;
      minutes = 59;
      seconds = 59;
    }
  }
}

// Endmeldung anzeigen und Zeit zurücksetzen
void showEndMessageAndResetTime() {
  lcd.clear();
  lcd.print("Time is up!");
  lcd.setCursor(0, 1);
  lcd.print("Press red btn");

  while (digitalRead(redButton) != LOW) {
    delay(100);
  }

  // Zeit zurücksetzen
  hours = 0;
  minutes = 0;
  seconds = 0;

  myservo.write(0); // Servo in die Ausgangsposition bewegen
  delay(500); // Warten, bis der Servo sich bewegt hat
  isServoMoving = false;
  isCountingDown = false;
  updateDisplay();
}