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

LiquidCrystal_I2C lcd(0x27, 20, 4);

RTC_DS3231 rtc;

#define DHTPIN 2
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

#define LIGHT_SENSOR A0
#define HEADLIGHT_RED 9
#define HEADLIGHT_GREEN 10
#define HEADLIGHT_BLUE 11

#define TEMP_UP 3
#define TEMP_DOWN 4

float currentTemperature = 0;
float desiredTemperature = 22.0;
int lightLevel = 0;
bool headlightsOn = false;

void setup() {

  lcd.init();
  lcd.backlight();

  if (!rtc.begin()) {
    lcd.print("RTC not found!");
    while (1);
  }

  dht.begin();

  pinMode(HEADLIGHT_RED, OUTPUT);
  pinMode(HEADLIGHT_GREEN, OUTPUT);
  pinMode(HEADLIGHT_BLUE, OUTPUT);

  pinMode(TEMP_UP, INPUT_PULLUP);
  pinMode(TEMP_DOWN, INPUT_PULLUP);

  lcd.clear();
  lcd.print("Car Computer Ready");
  delay(2000);
}

void loop() {
  DateTime now = rtc.now();
  String currentTime = String(now.hour()) + ":" + String(now.minute()) + ":" + String(now.second());

  currentTemperature = dht.readTemperature();

  lightLevel = analogRead(LIGHT_SENSOR);

  headlightsOn = (lightLevel > 200);

  if (digitalRead(TEMP_UP) == LOW) {
    desiredTemperature += 0.5;
    delay(200);
  }
  if (digitalRead(TEMP_DOWN) == LOW) {
    desiredTemperature -= 0.5;
    delay(200);
  }

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Time: ");
  lcd.print(currentTime);

  lcd.setCursor(0, 1);
  lcd.print("Temp: ");
  lcd.print(currentTemperature);
  lcd.print("C");

  lcd.setCursor(0, 2);
  lcd.print("Desired: ");
  lcd.print(desiredTemperature);
  lcd.print("C");

  lcd.setCursor(0, 3);
  lcd.print("Lights: ");
  lcd.print(headlightsOn ? "ON" : "OFF");

  if (headlightsOn) {
    digitalWrite(HEADLIGHT_RED, HIGH);
    digitalWrite(HEADLIGHT_GREEN, HIGH);
    digitalWrite(HEADLIGHT_BLUE, LOW);
  } else {
    digitalWrite(HEADLIGHT_RED, LOW);
    digitalWrite(HEADLIGHT_GREEN, LOW);
    digitalWrite(HEADLIGHT_BLUE, LOW);
  }

  delay(500);
}