#include <Servo.h>
#include <DHT.h>

// === Pin Configuration ===
const int trigPin = 5;         // Ultrasonic sensor - trig
const int echoPin = 6;         // Ultrasonic sensor - echo
const int servoPin = 9;        // Servo motor
const int ldrPin = A0;         // LDR sensor
const int ledBuzzerPin = 2;    // LED & Buzzer on the same pin

#define DHTPIN 7               // DHT11 data pin
#define DHTTYPE DHT11
DHT dht(DHTPIN, DHTTYPE);

// === Threshold Configuration ===
const int lightThreshold = 900;        // Light threshold
const float tempThreshold = 30.0;      // Temperature threshold (°C)
const int openDistance = 9;            // Distance threshold for door open (cm)

// === State Variables ===
long duration;
int distance;
unsigned long lastDetectedTime = 0;
const int closeDelay = 2000;           // 2-second delay before closing door

// === Servo Initialization ===
Servo doorServo;

void setup() {
    Serial.begin(9600);

    pinMode(trigPin, OUTPUT);
    pinMode(echoPin, INPUT);
    pinMode(ldrPin, INPUT);
    pinMode(ledBuzzerPin, OUTPUT);

    dht.begin();

    doorServo.attach(servoPin);
    doorServo.write(0);                // Ensure door is closed at startup
    digitalWrite(ledBuzzerPin, LOW);
}

void playFunnyMelody() {
    int melody[] = {
        262, 294, 330, 262,
        392, 330, 440, 392,
        523, 494, 587, 494,
        330, 392, 440, 392,
        262, 330, 294, 262
    };

    int noteDurations[] = {
        150, 150, 300, 150,
        150, 300, 200, 200,
        400, 300, 250, 250,
        200, 250, 200, 300,
        250, 200, 150, 400
    };

    for (int i = 0; i < 9; i++) {
        tone(ledBuzzerPin, melody[i]);
        delay(noteDurations[i]);
        noTone(ledBuzzerPin);
        digitalWrite(ledBuzzerPin, HIGH);
        delay(50);                     // LED blink between notes
        digitalWrite(ledBuzzerPin, LOW);
    }
}

void loop() {
    // === Read LDR Value ===
    int lightValue = analogRead(ldrPin);
    Serial.print("Cahaya: ");
    Serial.println(lightValue);

    // === Read Temperature ===
    float temperature = dht.readTemperature();
    Serial.print("Suhu: ");
    Serial.print(temperature);
    Serial.println(" °C");

    // === Read Distance from Ultrasonic ===
    digitalWrite(trigPin, LOW);
    delayMicroseconds(2);
    digitalWrite(trigPin, HIGH);
    delayMicroseconds(10);
    digitalWrite(trigPin, LOW);

    duration = pulseIn(echoPin, HIGH);
    distance = duration * 0.034 / 2;

    Serial.print("Jarak: ");
    Serial.print(distance);
    Serial.println(" cm");

    // === Door Open Logic ===
    if (temperature > tempThreshold || lightValue < lightThreshold || (distance > 0 && distance < openDistance)) {
        doorServo.write(90);
        digitalWrite(ledBuzzerPin, HIGH);
        playFunnyMelody();             // Play melody when door opens
        Serial.println("Pintu Terbuka");
        lastDetectedTime = millis();
    }

    // === Door Close Logic ===
    else if (millis() - lastDetectedTime >= closeDelay) {
        doorServo.write(0);
        digitalWrite(ledBuzzerPin, LOW);
        Serial.println("Pintu Tertutup");
    }

    delay(500);
}