#define BLYNK_TEMPLATE_ID "TMPL6MtRMXr09"
#define BLYNK_TEMPLATE_NAME "lampu otomatis"

#include <WiFi.h>
#include <BlynkSimpleEsp32.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <NTPClient.h>
#include <WiFiUdp.h>

#define LDR_PIN 34
#define BUZZER_PIN 13
#define RELAY_PIN 23

LiquidCrystal_I2C lcd(0x27, 16, 2);

char auth[] = "7ermN_WTuQ-5NdR0-H9kvbtwAZnI4qLA";
char ssid[] = "Wokwi-GUEST";
char pass[] = "";

WiFiUDP ntpUDP;
NTPClient timeClient(ntpUDP, "pool.ntp.org", 25200, 60000);

// Alarm settings
bool alarmActive = false;
int alarmHour = 0;

// Alarm runtime
bool alarmRunning = false;
unsigned long alarmStart = 0;
const unsigned long alarmDuration = 600; // 10 menit

bool lampStatus = false;

void setup() {
  Serial.begin(115200);

  pinMode(LDR_PIN, INPUT);
  pinMode(BUZZER_PIN, OUTPUT);
  pinMode(RELAY_PIN, OUTPUT);

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

  WiFi.begin(ssid, pass);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting...");
  }

  Blynk.begin(auth, ssid, pass);
  timeClient.begin();
}

void loop() {
  Blynk.run();
  timeClient.update();

  // Lampu otomatis
  int ldrValue = analogRead(LDR_PIN);
  if (!lampStatus) {
    digitalWrite(RELAY_PIN, (ldrValue < 500) ? HIGH : LOW);
  }

  int currentHour = timeClient.getHours();

  // =============================
  // LOGIKA ALARM JAM SAJA
  // =============================
  if (alarmActive && !alarmRunning) {
    if (currentHour == alarmHour) {
      alarmRunning = true;
      alarmStart = timeClient.getEpochTime();
      Serial.println("ALARM STARTED!");
    }
  }

  // =============================
  // ALARM BERBUNYI 10 MENIT
  // =============================
  if (alarmRunning) {
    unsigned long now = timeClient.getEpochTime();

    if (now - alarmStart < alarmDuration) {
      digitalWrite(BUZZER_PIN, HIGH);
    } else {
      digitalWrite(BUZZER_PIN, LOW);
      alarmRunning = false;
      alarmActive = false;
      Blynk.virtualWrite(V2, 0); // update aplikasi
      Serial.println("ALARM STOP");
    }
  } else {
    digitalWrite(BUZZER_PIN, LOW);
  }

  // LCD
  lcd.setCursor(0,1);
  lcd.print("Time: ");
  lcd.print(timeClient.getFormattedTime());
}

BLYNK_WRITE(V1) {
  alarmHour = param.asInt();
  Serial.print("Alarm Set Hour = ");
  Serial.println(alarmHour);
}

BLYNK_WRITE(V2) {
  alarmActive = param.asInt();

  if (!alarmActive) {
    alarmRunning = false;
    digitalWrite(BUZZER_PIN, LOW);
  }
}

BLYNK_WRITE(V3) {
  lampStatus = param.asInt();
  digitalWrite(RELAY_PIN, lampStatus ? HIGH : LOW);
}