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

int layer = 11;

const int buttonPin = A1;
int buttonState = 0;
int lastButtonState = 0;
int buttonPressCount = 0;
unsigned long lastDebounceTime = 0;
unsigned long debounceDelay = 5;

const int ledPin = 12; 
unsigned long previousMillis = 0; 
const long interval = 100;

unsigned long startTime;
const unsigned long longPressDuration = 500;

bool tombol = true;
bool sound = true;

const unsigned long longPressTime = 2000; // waktu tekan lama dalam milidetik (2 detik)
unsigned long keyPressTime = 0; // variabel untuk menyimpan waktu tombol ditekan
bool longPressDetected = false; // flag untuk mendeteksi tekan lama
char lastKey = NO_KEY; // variabel untuk menyimpan tombol terakhir yang ditekan

LiquidCrystal_I2C lcd(0x27, 16, 2); 

const byte ROWS = 4;
const byte COLS = 4;
char keys[ROWS][COLS] = {
  {'1', '2', '3', 'A'},
    {'4', '5', '6', 'B'},
      {'7', '8', '9', 'C'},
        {'*', '0', '#', 'D'}
        };
        byte rowPins[ROWS] = {9, 8, 7, 6}; 
        byte colPins[COLS] = {5, 4, 3, 2}; 
        Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

        int setcount = 0;
        char inputBuffer[6] = ""; // Buffer untuk input (5 digit + null terminator)

        void setup() {
          lcd.init();
            lcd.backlight();
              lcd.setCursor(0, 0);
                lcd.print("Set Amount=0");
                  lcd.setCursor(0, 1);
                    lcd.print("Amount=");
                      lcd.setCursor(8, 1);
                        lcd.print(buttonPressCount);
                          pinMode(buttonPin, INPUT_PULLUP);
                            pinMode(ledPin, OUTPUT);
                              Serial.begin(9600);
                                pinMode(11,OUTPUT);
                                  digitalWrite(11,HIGH);
                                  }

                                  void loop() {
                                    unsigned long currentMillis = millis();
                                      int reading = digitalRead(buttonPin);
                                        if (reading != lastButtonState) {
                                          lastDebounceTime = millis();
                                            }
                                              char key = keypad.getKey();
                                                if (tombol == true){
                                                    if (key) {
                                                          switch (key)
                                                                {
                                                                        case '0':
                                                                                case '1':
                                                                                        case '2':
                                                                                                case '3':
                                                                                                        case '4':
                                                                                                                case '5':
                                                                                                                        case '6':
                                                                                                                                case '7':
                                                                                                                                        case '8':
                                                                                                                                                case '9':
                                                                                                                                                          if (layer != 16) {
                                                                                                                                                                      lcd.setCursor(layer, 0);
                                                                                                                                                                                  lcd.print(key);
                                                                                                                                                                                              inputBuffer[layer - 11] = key; // Menyimpan input ke buffer
                                                                                                                                                                                                          layer = layer + 1;
                                                                                                                                                                                                                    }
                                                                                                                                                                                                                              break;
                                                                                                                                                                                                                                      case 'C':
                                                                                                                                                                                                                                                if (layer != 11) {
                                                                                                                                                                                                                                                            lcd.setCursor(layer - 1, 0);
                                                                                                                                                                                                                                                                        lcd.print(" ");
                                                                                                                                                                                                                                                                                    layer = layer - 1;
                                                                                                                                                                                                                                                                                                inputBuffer[layer - 11] = '\0'; // Menghapus input dari buffer
                                                                                                                                                                                                                                                                                                          }
                                                                                                                                                                                                                                                                                                                    break;
                                                                                                                                                                                                                                                                                                                          }
                                                                                                                                                                                                                                                                                                                              }
                                                                                                                                                                                                                                                                                                                                }
                                                                                                                                                                                                                                                                                                                                    if (key != NO_KEY) {
                                                                                                                                                                                                                                                                                                                                        if (key == 'D') {
                                                                                                                                                                                                                                                                                                                                              if (key != lastKey) {
                                                                                                                                                                                                                                                                                                                                                      keyPressTime = millis(); 
                                                                                                                                                                                                                                                                                                                                                              longPressDetected = false;
                                                                                                                                                                                                                                                                                                                                                                    }      
                                                                                                                                                                                                                                                                                                                                                                    unsigned long pressDuration = millis() - keyPressTime;
                                                                                                                                                                                                                                                                                                                                                                    if (pressDuration >= longPressTime &&
                                                                                                                                                                                                                                                                                                                                                                    !longPressDetected) {
                                                                                                                                                                                                                                                                                                                                                                            longPressDetected = true;
                                                                                                                                                                                                                                                                                                                                                                                    tombol = true;
                                                                                                                                                                                                                                                                                                                                                                                            digitalWrite(11,HIGH);
                                                                                                                                                                                                                                                                                                                                                                                                  }
                                                                                                                                                                                                                                                                                                                                                                                                      }
                                                                                                                                                                                                                                                                                                                                                                                                        } else if (lastKey == 'D') {
                                                                                                                                                                                                                                                                                                                                                                                                            if (!longPressDetected) {
                                                                                                                                                                                                                                                                                                                                                                                                                      if (tombol == true){
                                                                                                                                                                                                                                                                                                                                                                                                                                    digitalWrite(11,LOW);
                                                                                                                                                                                                                                                                                                                                                                                                                                                  sound =true;
                                                                                                                                                                                                                                                                                                                                                                                                                                                                digitalWrite(ledPin, LOW);
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              inputBuffer[5] = '\0';
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            setcount = atoi(inputBuffer);
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          tombol = false;
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    }
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        }
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          }

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            if ((millis() - lastDebounceTime) > debounceDelay) {
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                if (reading != buttonState) {
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      buttonState = reading;
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            if (buttonState == LOW) {
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    buttonPressCount++;
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            lcd.setCursor(8, 1);
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    lcd.print(buttonPressCount);
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            digitalWrite(ledPin, HIGH);
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  }
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      }
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        }
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          lastButtonState = reading;
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            if ((buttonPressCount >= setcount) && (setcount != 0) && (sound == true)){
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          if (key == 'B'){
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        sound = false;
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      digitalWrite(ledPin, LOW);
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                }
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      if (currentMillis - previousMillis >= interval) {
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            previousMillis = currentMillis; 
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  if (digitalRead(ledPin) == LOW) {
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        digitalWrite(ledPin, HIGH);
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              } else {
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        digitalWrite(ledPin, LOW);
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              }
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                }
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                }
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   if (buttonPressCount < setcount){
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         digitalWrite(ledPin,LOW);
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           }
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             lastKey = key;

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             if (key == 'A'){
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 tombol = true;
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     digitalWrite(11,HIGH);
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     }
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     }