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

LiquidCrystal_I2C lcd(0x27, 20, 4);

// Tombol
const int pbOnOff = 2;
const int pbMode = 3;
const int pbUp = 4;
const int pbDown = 5;

// Relay pin
const int relayPins[4] = {6, 7, 8, 9};

// Waktu saat ini
int jam = 0;
int menit = 0;
int detik = 0;

// Waktu aktif relay (jam dan menit)
int relayHours[4] = {0, 0, 0, 0};
int relayMinutes[4] = {0, 0, 0, 0};

// Waktu aktif relay sebelumnya (untuk 1 menit nyala)
unsigned long lastActivated[4] = {0, 0, 0, 0};
bool relayOn[4] = {false, false, false, false};

// Mode pengaturan
int mode = 0; // 0 = normal, 1-8 = atur jam/menit relay 1-4

// Status global ON/OFF sistem
bool systemOn = true; // Status awal ON

// Waktu millis untuk detik
unsigned long previousMillis = 0;

void setup() {
  Serial.begin(9600);
  lcd.init();
  lcd.backlight();

  pinMode(pbOnOff, INPUT_PULLUP);
  pinMode(pbMode, INPUT_PULLUP);
  pinMode(pbUp, INPUT_PULLUP);
  pinMode(pbDown, INPUT_PULLUP);

  for (int i = 0; i < 4; i++) {
    pinMode(relayPins[i], OUTPUT);
    digitalWrite(relayPins[i], LOW);
  }

  lcd.setCursor(0, 0);
  lcd.print("Jam = 00:00:00");
}

void loop() {
  unsigned long currentMillis = millis();

  // Update waktu tiap 1 detik
  if (currentMillis - previousMillis >= 1000) {
    previousMillis = currentMillis;
    detik++;
    if (detik >= 60) {
      detik = 0;
      menit++;
      if (menit >= 60) {
        menit = 0;
        jam++;
        if (jam >= 24) jam = 0;
      }
    }
  }

  // Tombol ON/OFF (PB1)
  if (digitalRead(pbOnOff) == LOW) {
    delay(200);
    systemOn = !systemOn; // Toggle status ON/OFF
    if (!systemOn) {
      for (int i = 0; i < 4; i++) {
        digitalWrite(relayPins[i], LOW); // Matikan semua relay
        relayOn[i] = false; // Reset status
      }
    }
  }

  // Tombol mode (ubah hingga mode 11)
  if (digitalRead(pbMode) == LOW) {
    delay(200);
    mode++;
    if (mode > 11) mode = 0;
  }

  // Tombol UP
  if (digitalRead(pbUp) == LOW) {
    delay(200);
    int idx = (mode - 1) / 2;
    if (mode >= 1 && mode <= 8) {
      if (mode % 2 == 1) {
        relayHours[idx]++;
        if (relayHours[idx] >= 24) relayHours[idx] = 0;
      } else {
        relayMinutes[idx]++;
        if (relayMinutes[idx] >= 60) relayMinutes[idx] = 0;
      }
    } else if (mode == 9) {
      jam++;
      if (jam >= 24) jam = 0;
    } else if (mode == 10) {
      menit++;
      if (menit >= 60) menit = 0;
    } else if (mode == 11) {
      detik++;
      if (detik >= 60) detik = 0;
    }
  }

  // Tombol DOWN
  if (digitalRead(pbDown) == LOW) {
    delay(200);
    int idx = (mode - 1) / 2;
    if (mode >= 1 && mode <= 8) {
      if (mode % 2 == 1) {
        relayHours[idx]--;
        if (relayHours[idx] < 0) relayHours[idx] = 23;
      } else {
        relayMinutes[idx]--;
        if (relayMinutes[idx] < 0) relayMinutes[idx] = 59;
      }
    }
  }

  // Cek waktu aktif relay jika sistem aktif
  if (systemOn) {
    for (int i = 0; i < 4; i++) {
      if (jam == relayHours[i] && menit == relayMinutes[i] && detik == 0) {
        digitalWrite(relayPins[i], HIGH);
        relayOn[i] = true;
        lastActivated[i] = currentMillis;
      }

      // Matikan relay setelah 1 menit
      if (relayOn[i] && currentMillis - lastActivated[i] >= 60000) {
        digitalWrite(relayPins[i], LOW);
        relayOn[i] = false;
      }
    }
  }

  // Tampilkan waktu
  lcd.setCursor(0, 0);
  lcd.print("Jam = ");
  if (jam < 10) lcd.print("0");
  lcd.print(jam); lcd.print(":");
  if (menit < 10) lcd.print("0");
  lcd.print(menit); lcd.print(":");
  if (detik < 10) lcd.print("0");
  lcd.print(detik);

  // Tampilkan waktu relay 1-4
  lcd.setCursor(0, 1);
  lcd.print("R1=");
  if (relayHours[0] < 10) lcd.print("0");
  lcd.print(relayHours[0]); lcd.print(":");
  if (relayMinutes[0] < 10) lcd.print("0");
  lcd.print(relayMinutes[0]);

  lcd.setCursor(10, 1);
  lcd.print("R2=");
  if (relayHours[1] < 10) lcd.print("0");
  lcd.print(relayHours[1]); lcd.print(":");
  if (relayMinutes[1] < 10) lcd.print("0");
  lcd.print(relayMinutes[1]);

  lcd.setCursor(0, 2);
  lcd.print("R3=");
  if (relayHours[2] < 10) lcd.print("0");
  lcd.print(relayHours[2]); lcd.print(":");
  if (relayMinutes[2] < 10) lcd.print("0");
  lcd.print(relayMinutes[2]);

  lcd.setCursor(9, 2);
  lcd.print(" R4=");
  if (relayHours[3] < 10) lcd.print("0");
  lcd.print(relayHours[3]); lcd.print(":");
  if (relayMinutes[3] < 10) lcd.print("0");
  lcd.print(relayMinutes[3]);

  // Tampilkan mode dan status sistem
  lcd.setCursor(0, 3);
  if (mode == 0) {
    lcd.print("    MAIN    ");
  } else {
    int idx = (mode - 1) / 2;
    if (mode % 2 == 1 && mode <= 8) {
      lcd.print("Jam Relay  "); lcd.print(idx + 1); lcd.print(" ");
    } else if (mode % 2 == 0 && mode <= 8) {
      lcd.print("Menit Relay"); lcd.print(idx + 1); lcd.print(" ");
    } else if (mode == 9) {
      lcd.print("SET JAM     ");
    } else if (mode == 10) {
      lcd.print("SET MENIT   ");
    } else if (mode == 11) {
      lcd.print("SET DETIK   ");
    }
  }

  lcd.setCursor(14, 3);
  if (systemOn) {
    lcd.print("ON ");
  } else {
    lcd.print("OFF");
  }
}