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

// Pin Definitions
const int Thermostat_pin = A0; // Pin for the NTC temperature sensor output

// RTC Object
RTC_DS1307 rtc;

// LCD Object
LiquidCrystal_I2C lcd(0x27, 20, 4); // Change address if needed

// Menu items
String MenuItems[] = {
    "Main Menu",
    "Submenu 1",
    "Submenu 2",
    "Submenu 3",
    "Submenu 4",
    "Submenu 5",
    "Submenu 6"
};

// Current menu state
int currentMenuItem = 0;

void setup() {
    Serial.begin(9600); // Initialize serial communication for output

    // Initialize RTC
    if (!rtc.begin()) {
        Serial.println("RTC not found!"); // Inform if RTC is not found
        while (1); // Halt if RTC is not found
    }

    // Initialize LCD
    lcd.begin(20, 4);
    lcd.backlight(); // Turn on the backlight
    lcd.clear();

    // Animation: Scrolling Text
    String welcomeMessage = "                             Welcome!................"; // Add spaces for smoother scrolling
    int messageLength = welcomeMessage.length();
    int displayWidth = 20; // Width of the display
    int scrollLength = messageLength + displayWidth; // Total length to scroll

    // Scroll the message across the LCD
    for (int pos = 0; pos < scrollLength; pos++) {
        lcd.setCursor(0, 1); // Set cursor position on the second row
        // Print the substring of the welcomeMessage
        lcd.print(welcomeMessage.substring(pos, pos + displayWidth)); 
        delay(50); // Adjust delay for speed of scrolling
    }
    
    delay(1000); // Pause before proceeding
}


void loop() {
    // Read and display the temperature
    int Thermostat = analogRead(Thermostat_pin); // Read the NTC sensor value
    float temperature = calculateTemperature(Thermostat); // Calculate temperature
  
    // Get current time from RTC
    DateTime currentTime = rtc.now();
  
    // Output the temperature and time
    Serial.print("Temperature: ");
    Serial.print(temperature);
    Serial.println(" °C");
  
    // Print date (DD/MM/YYYY)
    Serial.print(currentTime.day());
    Serial.print("/");
    Serial.print(currentTime.month());
    Serial.print("/");
    Serial.print(currentTime.year());
    Serial.print(" - ");
  
    // Print time (HH:MM:SS)
    Serial.print(currentTime.hour());
    Serial.print(":");
    Serial.print(currentTime.minute());
    Serial.print(":");
    Serial.println(currentTime.second());
    
    // Update LCD with current menu item
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print(MenuItems[currentMenuItem]);
    lcd.setCursor(0, 1);
    lcd.print("Temp: ");
    lcd.print(temperature);
    lcd.print(" C");
    lcd.setCursor(0, 2);
    lcd.print("Date: ");
    lcd.print(currentTime.day());
    lcd.print("/");
    lcd.print(currentTime.month());
    lcd.print("/");
    lcd.print(currentTime.year());
    lcd.setCursor(0, 3);
    lcd.print("Time: ");
    lcd.print(currentTime.hour());
    lcd.print(":");
    lcd.print(currentTime.minute());
    lcd.print(":");
    lcd.print(currentTime.second());
    
    delay(1000); // Delay for 1 second before the next read
}

// Thermostat to temperature
float calculateTemperature(int sensorValue) {
    float resistance = (1023.0 / sensorValue) - 1.0; // Calculate resistance
    resistance = 10000.0 / resistance; // Convert to temperature
    return (1.0 / (log(resistance / 10000.0) / 3950 + (1.0 / 298.15))) - 273.15; // Return Celsius
}