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

// Set the LCD address to 0x27 for a 20 chars and 4 line display
LiquidCrystal_I2C lcd(0x27, 20, 4);  // Change the address if necessary


const int ldrSensorPin = A1;
const int trigPin = 13;
const int echoPin = 12;
const int pirSensorPin = 8;

const int blueLedPin = 10;
const int greenLedPin = 11;
const int violetLedPin = 3;

void setup() {
 
  pinMode(ldrSensorPin, INPUT);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(pirSensorPin, INPUT);

  
  pinMode(blueLedPin, OUTPUT);
  pinMode(greenLedPin, OUTPUT);
  pinMode(violetLedPin, OUTPUT);

  lcd.init();                      // Initialize the LCD
  lcd.backlight();                 // Turn on the backlight
  lcd.setCursor(0, 1);
  lcd.print("     SMART HOME");      // Display a startup message
  lcd.setCursor(0, 2);
  lcd.print("       SYSTEM");
  delay(2000);                     // Wait 2 seconds
  lcd.clear();                     // Clear the LCD screen
}

void loop() {
  
  int ldrValue = analogRead(ldrSensorPin);
  int pirValue = digitalRead(pirSensorPin);

  if (pirValue == HIGH && getDistance() < 90 && ldrValue < 200) {
    digitalWrite(violetLedPin, HIGH);
    lcd.clear();
    lcd.setCursor(0, 1);
    lcd.print(" ALERTE MV");
    delay(2000);
    digitalWrite(violetLedPin, LOW);

    digitalWrite(greenLedPin, HIGH);
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print(". ECLAIRAGE ENTREE ");
    lcd.setCursor(0, 1);
    lcd.print("        ON");
    delay(2000);
    digitalWrite(greenLedPin, LOW);

    digitalWrite(blueLedPin, HIGH);
    lcd.clear();
    lcd.setCursor(0, 1);
    lcd.print("     ECLAIRAGE AUTO");
    lcd.setCursor(0, 2);
    lcd.print("           ON");
    delay(2000);
    digitalWrite(blueLedPin, LOW);

  } else if (pirValue == HIGH) {
    digitalWrite(violetLedPin, HIGH);
    lcd.clear();
    lcd.setCursor(0, 1);
    lcd.print("    ALERTE MV");
    delay(2000);
    digitalWrite(violetLedPin, LOW);

  } else if (getDistance() < 90) {
    digitalWrite(greenLedPin, HIGH);
    lcd.clear();
    lcd.setCursor(0, 1);
    lcd.print("  ECLAIRAGE ENTREE ");
    lcd.setCursor(0, 2);
    lcd.print("         ON");
    delay(2000);
    digitalWrite(greenLedPin, LOW);

  } else if (ldrValue < 200) {
    digitalWrite(blueLedPin, HIGH);
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print(" ECLAIRAGE AUTO");
    lcd.setCursor(0, 1);
    lcd.print("       ON");
    delay(2000);
    digitalWrite(blueLedPin, LOW);

  } else {
    turnOffAllLeds();
    lcd.clear();
    lcd.setCursor(0, 1);
    lcd.print("      NO ALERT");
  }

  delay(1000); // Adjust the delay as needed
}

int getDistance() {
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  return pulseIn(echoPin, HIGH) * 0.034 / 2; // Convert pulse duration to distance
}

void turnOffAllLeds() {
  
  digitalWrite(blueLedPin, LOW);
  digitalWrite(greenLedPin, LOW);
  digitalWrite(violetLedPin, LOW);
}