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

// Inisialisasi LCD dan RTC
LiquidCrystal_I2C lcd(0x27, 16, 2);
RTC_DS1307 rtc;

// Inisialisasi pin untuk flowmeter dan push button
const int flowmeterPin = 2;  // Pin flowmeter
const int buttonPin = 3;     // Pin push button

// Variabel untuk pengukuran flowmeter
volatile int pulseCount = 0;
float flowRate = 0;
float totalLiters = 0;
unsigned long oldTime = 0;

// Variabel untuk penyimpanan history
float history1 = 0;
float history2 = 0;
float history3 = 0;

// Variabel untuk tracking waktu
DateTime now;
int currentHistory = 1;

// Fungsi interrupt untuk menghitung pulsa flowmeter
void pulseCounter() {
  pulseCount++;
}

void setup() {
  // Setup LCD
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Flowmeter");

  // Setup RTC
  if (!rtc.begin()) {
    lcd.setCursor(0, 1);
    lcd.print("RTC Gagal");
    while (1);
  }

  if (!rtc.isrunning()) {
    rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
  }

  // Setup flowmeter
  pinMode(flowmeterPin, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(flowmeterPin), pulseCounter, FALLING);

  // Setup push button
  pinMode(buttonPin, INPUT_PULLUP);

  // Reset variabel waktu
  oldTime = millis();
}

void loop() {
  // Membaca waktu saat ini
  now = rtc.now();

  // Menghitung flowrate
  if (millis() - oldTime > 1000) {
    detachInterrupt(digitalPinToInterrupt(flowmeterPin));

    float pulseRate = pulseCount;
    pulseCount = 0;
    flowRate = pulseRate / 7.5;
    totalLiters += (flowRate / 60);
    
    // Reset jika sudah 24 jam
    if (now.hour() == 0 && now.minute() == 0 && now.second() == 0) {
      totalLiters = 0;
      history1 = 0;
      history2 = 0;
      history3 = 0;
    }

    // Simpan hasil ke history berdasarkan waktu
    if (now.hour() >= 6 && now.hour() < 14) {
      history1 = totalLiters;
    } else if (now.hour() >= 14 && now.hour() < 22) {
      history2 = totalLiters;
    } else {
      history3 = totalLiters;
    }

    // Tampilkan flowrate dan total liters
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Flow: ");
    lcd.print(flowRate);
    lcd.print(" L/min");

    lcd.setCursor(0, 1);
    lcd.print("Total: ");
    lcd.print(totalLiters);
    lcd.print(" L");

    oldTime = millis();
    attachInterrupt(digitalPinToInterrupt(flowmeterPin), pulseCounter, FALLING);
  }

  // Cek push button untuk menampilkan history
  if (digitalRead(buttonPin) == LOW) {
    delay(200); // Debouncing delay
    currentHistory++;
    if (currentHistory > 3) {
      currentHistory = 1;
    }

    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("History ");
    lcd.print(currentHistory);
    lcd.setCursor(0, 1);

    if (currentHistory == 1) {
      lcd.print(history1);
    } else if (currentHistory == 2) {
      lcd.print(history2);
    } else {
      lcd.print(history3);
    }

    lcd.print(" L");
    delay(4000); // Delay to avoid bouncing effect
  }
}