#include <LiquidCrystal.h>
#include <Servo.h>

// LCD, pin
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
const int buttons[] = {6, 7, 8, 9, A1}; 
const int potPin = A0; 
int money = 0; 

// Harga, nama item
const int prices[] = {0, 15000, 12000, 10000, 17000, 20000};
const char *itemNames[] = {"None", "Obat Flu & Batuk", "Obat Sakit Pala", "Obat Sakit Perut", "Obat Nyeri Otot", "Obat Kesemutan"};

// Servo motor dan buzzer
Servo dispenserServo;
const int servoPin = 10, buzzerPin = 13;
const int openPos = 90, closePos = 0;
int selectedItem = 0;

void setup() {
  lcd.begin(16, 2);
  Serial.begin(9600);
  
  // Serial Monitr
  Serial.println("DAFTAR HARGA ITEM");
  Serial.println("-----------------------------------");
  for (int i = 1; i <= 5; i++) {
    Serial.print(itemNames[i]);
    Serial.print(" (");
    switch (i) {
      case 1: Serial.print("Merah"); break;
      case 2: Serial.print("Ijo"); break;
      case 3: Serial.print("Kuning"); break;
      case 4: Serial.print("Biru"); break;
      case 5: Serial.print("Abu"); break;
    }
    Serial.print("), ");
    Serial.print(prices[i] / 1000);
    Serial.println(" Ribu");
  }
  Serial.println("-----------------------------------");
  
  for (int i = 0; i < 5; i++) pinMode(buttons[i], INPUT_PULLUP);
  dispenserServo.attach(servoPin);
  dispenserServo.write(closePos);
  pinMode(buzzerPin, OUTPUT);
  displayLoadingScreen();
  lcd.clear();
  lcd.print("Vending Machine");
  lcd.setCursor(0, 1);
  lcd.print("Masukkan Uang");
}

void loop() {
  money = map(analogRead(potPin), 0, 1023, 0, 50000);
  lcd.setCursor(0, 1);
  lcd.print("Saldo: " + String(money) + " IDR ");

  for (int i = 0; i < 5; i++) {
    if (digitalRead(buttons[i]) == LOW) {
      selectedItem = i + 1;
      processTransaction(prices[selectedItem]);
      break;
    }
  }
}

// Fungsi untuk menampilkan loading screen
void displayLoadingScreen() {
  lcd.clear();
  lcd.print("    Medicine    ");
  lcd.setCursor(0, 1);
  lcd.print("Vending Machine");
  delay(1000);
  lcd.clear();
  lcd.print("Loading...");
  for (int i = 0; i < 16; i++) {
    lcd.setCursor(i, 1);
    lcd.print((char)255);
    delay(200);
  }
  delay(500);
}

// Fungsi untuk proses transaksi
void processTransaction(int price) {
  lcd.clear();
  lcd.print(itemNames[selectedItem]);
  if (money >= price) {
    int change = money - price;
    money -= price;
    lcd.setCursor(0, 1);
    lcd.print("Memuat Item...");
    dispenserServo.write(openPos);
    playBuzzerMelody();
    delay(2000);
    dispenserServo.write(closePos);
    delay(3000);
    if (change > 0) {
      lcd.clear();
      lcd.print("Kembalian: " + String(change) + " IDR");
      delay(3000);
    }
  } else {
    lcd.setCursor(0, 1);
    lcd.print("SALDO TAK CUKUP");
    delay(2000);
    lcd.clear();
    lcd.print("Harga: " + String(price) + " IDR");
    lcd.setCursor(0, 1);
    lcd.print("Saldo Kurang");
    delay(3000);
  }
  resetDisplay();
}

// Fungsi buzzr
void playBuzzerMelody() {
  int melody[] = {262, 294, 330, 349, 392, 440, 494, 523},
      noteDurations[] = {200, 200, 200, 200, 200, 200, 200, 200};
  for (int i = 0; i < 8; i++) {
    tone(buzzerPin, melody[i], noteDurations[i]);
    delay(noteDurations[i] * 1.3);
  }
  noTone(buzzerPin);
}

void resetDisplay() {
  lcd.clear();
  lcd.print("Vending Machine");
  lcd.setCursor(0, 1);
  lcd.print("Saldo: " + String(money) + " IDR ");
}