// Include libraries
#include <WiFi.h>
#include <BlynkSimpleEsp32.h>
#include <RTClib.h>
#include <LiquidCrystal_I2C.h>
#include <Wire.h>

// Blynk credentials (GANTI DENGAN MILIKMU)
char auth[] = "YOUR_BLYNK_AUTH_TOKEN";  // Dapatkan dari Blynk app
char ssid[] = "Wokwi-GUEST";            // WiFi SSID untuk Wokwi (atau WiFi rumahmu)
char pass[] = "";                       // WiFi password (kosong untuk Wokwi)

// Pin definitions
#define LED_PIN 13
#define LDR_PIN 34              // Analog pin untuk LDR sensor (ganti dari POT_PIN)
#define BUZZER_PIN 15
#define LCD_ADDR 0x27           // Alamat I2C LCD (default 0x27 atau 0x3F)

// Threshold untuk LDR (sesuaikan: >2000 = gelap = trigger toggle)
#define LDR_THRESHOLD 2000      // Nilai analog tinggi = gelap (test dengan Serial Monitor)

// Objects
RTC_DS3231 rtc;
LiquidCrystal_I2C lcd(LCD_ADDR, 16, 2);

// Variables
bool lampuState = false;  // Status lampu (false = mati)
bool lastTriggerState = false;  // Flag untuk deteksi perubahan (debounce, untuk LDR)
unsigned long lastToggle = 0;    // Untuk debounce (minimal 1 detik)
int alarmHour = 0;    // Jam alarm (dari Blynk V1)
int alarmMinute = 0;  // Menit alarm (dari Blynk V2)
bool alarmActive = false;  // Flag untuk alarm berbunyi
unsigned long lastUpdate = 0;  // Untuk update LCD (setiap 1 detik)

void setup() {
  // Initialize pins
  pinMode(LED_PIN, OUTPUT);
  pinMode(LDR_PIN, INPUT);   // Analog untuk LDR (aktif default)
  pinMode(BUZZER_PIN, OUTPUT);
  digitalWrite(LED_PIN, LOW);
  digitalWrite(BUZZER_PIN, LOW);

  // Initialize Serial for debug (lihat nilai LDR di sini)
  Serial.begin(115200);

  // Initialize I2C
  Wire.begin(21, 22);  // SDA=21, SCL=22 untuk ESP32

  // Initialize LCD
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Starting...");

  // Initialize RTC
  if (!rtc.begin()) {
    Serial.println("Couldn't find RTC");
    lcd.clear();
    lcd.print("RTC Error!");
    while (1);
  }
  if (rtc.lostPower()) {
    Serial.println("RTC lost power, setting time!");
    rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));  // Set waktu compile sebagai default
  }

  // Connect to Blynk
  Blynk.begin(auth, ssid, pass);

  // Initial LCD
  updateLCD();
}

void loop() {
  Blynk.run();  // Handle Blynk

  // Update LCD setiap 1 detik
  if (millis() - lastUpdate > 1000) {
    updateLCD();
    checkAlarm();  // Cek alarm
    lastUpdate = millis();
  }

  // === LOGIC UNTUK LDR SENSOR (AKTIF DEFAULT) ===
  int ldrValue = analogRead(LDR_PIN);
  Serial.print("LDR Value: "); Serial.println(ldrValue);  // Debug (pantau di Serial Monitor)
  bool isTrigger = (ldrValue > LDR_THRESHOLD);  // Tinggi = gelap = trigger (simulasi kondisi gelap)
  
  if (isTrigger && !lastTriggerState && (millis() - lastToggle > 1000)) {  // Edge + debounce
    lampuState = !lampuState;  // Toggle
    digitalWrite(LED_PIN, lampuState);
    Serial.println(lampuState ? "Lampu NYALA (LDR gelap)" : "Lampu MATI (LDR terang)");
    Blynk.virtualWrite(V0, lampuState);  // Sync ke Blynk
    lastToggle = millis();
  }
  lastTriggerState = isTrigger;

  // Alarm buzzer (jika active, beep setiap detik)
  if (alarmActive) {
    digitalWrite(BUZZER_PIN, HIGH);
    delay(200);
    digitalWrite(BUZZER_PIN, LOW);
    delay(800);
    
    // Jika lampu nyala saat alarm, matikan otomatis
    if (lampuState) {
      lampuState = false;
      digitalWrite(LED_PIN, LOW);
      Serial.println("Lampu MATI (alarm)");
      Blynk.virtualWrite(V0, false);
    }
  }
}

// Blynk functions (sama seperti sebelumnya)
BLYNK_WRITE(V0) {  // Virtual Pin V0: Switch untuk kontrol lampu
  lampuState = param.asInt();
  digitalWrite(LED_PIN, lampuState);
  Serial.println(lampuState ? "Lampu NYALA (Blynk)" : "Lampu MATI (Blynk)");
}

BLYNK_WRITE(V1) {  // Virtual Pin V1: Slider jam alarm (0-23)
  alarmHour = param.asInt();
  Serial.print("Alarm Jam: "); Serial.println(alarmHour);
  rtc.setAlarm(ALM1_MATCH_HOURS, 0, alarmHour, 0);  // Menit=0, detik=0
}

BLYNK_WRITE(V2) {  // Virtual Pin V2: Slider menit alarm (0-59)
  alarmMinute = param.asInt();
  Serial.print("Alarm Menit: "); Serial.println(alarmMinute);
  rtc.setAlarm(ALM1_MATCH_MINUTES, 0, alarmMinute, alarmHour);  // Detik=0
}

// Function to update LCD (sama)
void updateLCD() {
  DateTime now = rtc.now();
  
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Time: ");
  if (now.hour() < 10) lcd.print("0");
  lcd.print(now.hour());
  lcd.print(":");
  if (now.minute() < 10) lcd.print("0");
  lcd.print(now.minute());
  lcd.print(":");
  if (now.second() < 10) lcd.print("0");
  lcd.print(now.second());
  
  lcd.setCursor(0, 1);
  lcd.print("Alarm: ");
  if (alarmHour < 10) lcd.print("0");
  lcd.print(alarmHour);
  lcd.print(":");
  if (alarmMinute < 10) lcd.print("0");
  lcd.print(alarmMinute);
  lcd.print(" Lampu:");
  lcd.print(lampuState ? "ON" : "OFF");
}

// Function to check alarm (sama)
void checkAlarm() {
  DateTime now = rtc.now();
  if (now.hour() == alarmHour && now.minute() == alarmMinute && now.second() == 0) {
    alarmActive = true;
    Serial.println("ALARM BERBUNYI!");
  } else {
    alarmActive = false;
  }
}