#include <LiquidCrystal_I2C.h>

#define RELAY_1_PIN 2
#define RELAY_2_PIN 3
#define BUTTON_PIN 4

#define SESSION_1_LENGTH 480000 // 8 minutes in milliseconds
#define SESSION_2_LENGTH 300000 // 5 minutes in milliseconds

LiquidCrystal_I2C lcd(0x27, 16, 2); // Initialize the LCD

void setup() {
  pinMode(RELAY_1_PIN, OUTPUT); // Set relay pins as output
  pinMode(RELAY_2_PIN, OUTPUT);
  pinMode(BUTTON_PIN, INPUT_PULLUP); // Set button pin as input with internal pull-up resistor
  lcd.init(); // Initialize the LCD
  lcd.backlight(); // Turn on the LCD backlight
  lcd.setCursor(3, 0);
  lcd.print("Pulse boton");
  lcd.setCursor(2, 1);
  lcd.print("Para iniciar");
}

void loop() {
  if (digitalRead(BUTTON_PIN) == LOW) { // If the button is pressed
    lcd.clear(); // Clear the LCD
    lcd.print("SESION 8 MINUTOS");
    unsigned long sessionStartTime = millis(); // Get the current time
    digitalWrite(RELAY_1_PIN, HIGH); // Turn on relay 1
    while (millis() - sessionStartTime < SESSION_1_LENGTH) { // While the session is running
      lcd.setCursor(0, 1);
     lcd.setCursor(7, 1);
      int remainingSeconds = (SESSION_1_LENGTH - (millis() - sessionStartTime)) / 1000; // Calcula los segundos restantes
      int minutes = remainingSeconds / 60; // Calcula los minutos restantes
      int seconds = remainingSeconds % 60; // Calcula los segundos restantes
      lcd.print(minutes);
      lcd.print(":");
      if (seconds < 10) {
        lcd.print("0"); // Añade un cero para los segundos menores de 10
    }
    lcd.print(seconds);
      lcd.print("    ");
    }
    digitalWrite(RELAY_1_PIN, LOW); // Turn off relay 1
    delay(2000); // Wait for 2 seconds
    lcd.clear(); // Clear the LCD
lcd.print("Ventilacion");
    sessionStartTime = millis(); // Get the current time
    digitalWrite(RELAY_2_PIN, HIGH); // Turn on relay 2
    while (millis() - sessionStartTime < SESSION_2_LENGTH) { // While the session is running
      lcd.setCursor(0, 1);
      int timeRemaining = (SESSION_2_LENGTH - (millis() - sessionStartTime)) / 1000;
      int minutes = timeRemaining / 60;
      int seconds = timeRemaining % 60;
      lcd.print(minutes);
      lcd.print(":");
      if (seconds < 10) {
        lcd.print("0");
      }
      lcd.print(seconds);
      lcd.print("    ");
      delay(500); // Wait for half a second
    }
    digitalWrite(RELAY_2_PIN, LOW); // Turn off relay 2
    lcd.clear(); // Clear the LCD
    lcd.print("Pulse boton para");
    lcd.setCursor(0, 1);
    lcd.print("iniciar session");
  }
}