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

LiquidCrystal_I2C lcd(0x27, 16, 2);

#define BTN_FREQ 4
#define BTN_SF 16
#define BTN_CR 17
#define BTN_SAVE 18

int freqIndex = 0;
const unsigned long freq[] = {
  433112500, 433362500, 433612500, 
  433862500, 434112500, 434362500, 434612500
};
int spreadingFactor = 6;
int codingRateIndex = 0;
const String codingRate[] = {"4", "4/5", "4/6", "4/7", "4/8"};

bool settingsSaved = false;

void displayInitialSettings() {
  lcd.setCursor(0, 0);
  lcd.print("Freq:");
  lcd.setCursor(6, 0);
  lcd.print(freqIndex + 1);
  lcd.setCursor(8, 0);
  lcd.print(freq[freqIndex] / 1000000.0, 4);
  lcd.print(" MHz");
  lcd.setCursor(0, 1);
  lcd.print("SF: ");
  lcd.setCursor(4, 1);
  lcd.print(spreadingFactor);
  lcd.setCursor(7, 1);
  lcd.print(" CR: ");
  lcd.setCursor(12, 1);
  lcd.print(codingRate[codingRateIndex]);
}

void updateFrequency() {
  lcd.setCursor(6, 0);
  lcd.print(freqIndex + 1);
  lcd.setCursor(8, 0);
  lcd.print(freq[freqIndex] / 1000000.0, 4);
  lcd.print(" MHz");
}

void updateSpreadingFactor() {
  lcd.setCursor(4, 1);
  lcd.print(spreadingFactor);
  lcd.print(" ");
}

void updateCodingRate() {
  lcd.setCursor(12, 1);
  lcd.print(codingRate[codingRateIndex]);
}

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

  pinMode(BTN_FREQ, INPUT_PULLUP);
  pinMode(BTN_SF, INPUT_PULLUP);
  pinMode(BTN_CR, INPUT_PULLUP);
  pinMode(BTN_SAVE, INPUT_PULLUP);

  displayInitialSettings();

  while (!settingsSaved) {
    if (digitalRead(BTN_FREQ) == LOW) {
      freqIndex = (freqIndex + 1) % 7;
      updateFrequency();
      delay(200);
    }

    if (digitalRead(BTN_SF) == LOW) {
      spreadingFactor++;
      if (spreadingFactor > 12) spreadingFactor = 6;
      updateSpreadingFactor();
      delay(200);
    }

    if (digitalRead(BTN_CR) == LOW) {
      codingRateIndex = (codingRateIndex + 1) % 5;
      updateCodingRate();
      delay(200);
    }

    if (digitalRead(BTN_SAVE) == LOW) {
      lcd.clear();
      delay(100);
      settingsSaved = true;
      lcd.setCursor(0, 0);
      lcd.print("Setting Berhasil");
      delay(1000);
      lcd.clear();

      // Tampilkan pengaturan di Serial Monitor
      Serial.println("Pengaturan Disimpan:");
      Serial.print("Frekuensi: ");
      Serial.print(freq[freqIndex]);
      Serial.println(" Hz");
      Serial.print("Spreading Factor: ");
      Serial.println(spreadingFactor);
      Serial.print("Coding Rate: ");
      Serial.println(codingRate[codingRateIndex]);
    }
  }
}

void loop() {
  lcd.setCursor(0, 0);
  lcd.print("Channel: ");
  lcd.setCursor(9, 0);
  lcd.print(freqIndex + 1);
  lcd.setCursor(0, 1);
  lcd.print("Freq: ");
  lcd.setCursor(6, 1);
  lcd.print(freq[freqIndex] / 1000000.0, 4);
  lcd.print(" MHz");
  delay(2000);
}