#include <Servo.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);
Servo servos[4]; //servo identities

#define button1 2 //----------------
#define button2 3 //|    BUTTON    |
#define button3 4 //|  PIN NUMBERS |
#define button4 5 //----------------
#define coinSlot 6 // coin slot counter wire to pin 6
#define LED 7 // LED Anode to pin 7 for processing indicator
#define vending 8 // vendin button to pin 8

int itemvalue1 = 10; // Replace 10 with the actual value for item #1
int itemvalue2 = 20; // Replace 20 with the actual value for item #2
int itemvalue3 = 30; // Replace 30 with the actual value for item #3
int itemvalue4 = 40; // Replace 40 with the actual value for item #4

const int numItems = 4;
int itemValues[numItems] = {itemvalue1, itemvalue2, itemvalue3, itemvalue4};
int buttonPins[numItems] = {button1, button2, button3, button4};
int buttonStatus;
int coinBalance;
int pulse;
int coinSlotStatus;
int buttonPressed;
int pulseValue = pulse;
int selectedMenuItem; // Track the selected item

int vendingStatus;
boolean userBalance = false;

void setup() {
  // put your setup code here, to run once:
  lcd.init();
  lcd.backlight();
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("     MARVIN");
  delay(1000);
  lcd.setCursor(0, 1);
  lcd.print("  Ma. VICTORIA");
  delay(50);
  digitalWrite(LED, HIGH);
  delay(500);
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("  PLEASE PRESS");
  lcd.setCursor(0, 1);
  lcd.print("  ITEM  BUTTON");
  pinMode(button1, INPUT_PULLUP);
  pinMode(button2, INPUT_PULLUP);
  pinMode(button3, INPUT_PULLUP);
  pinMode(button4, INPUT_PULLUP);
  pinMode(coinSlot, INPUT_PULLUP);
  pinMode(LED, OUTPUT);
  pinMode(vending, INPUT_PULLUP);
  servos[0].attach(30); // Attach servo1 to pin 30
  servos[1].attach(31); // Attach servo2 to pin 31
  servos[2].attach(32); // Attach servo3 to pin 32
  servos[3].attach(33); // Attach servo4 to pin 33
}

void loop() {
  // Loop through the items
  //Wait until one of the item buttons is pressed.
  for (int i = 0; i < numItems; i++) {
    int buttonStatus = digitalRead(buttonPins[i]);
    if (buttonStatus == 0) {
      buttonPressed = 1;
      selectedMenuItem = i; // Track the selected item
      digitalWrite(LED, LOW);
      delay(200);
      digitalWrite(LED, HIGH);
      delay(200);
      digitalWrite(LED, LOW);
      delay(200);
      digitalWrite(LED, HIGH);
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("    ITEM #" + String(i + 1, DEC));
      lcd.setCursor(0, 1);
      lcd.print("  IS  SELECTED");
      delay(1000);
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("  INSERT COINS");
      lcd.setCursor(0, 1);
      lcd.print("    PHP ");
      lcd.setCursor(8, 1);
      lcd.print(itemValues[i]);
    }
  }
  //After one of the buttons is pressed, execute the LCD display.

  //INSERT COIN
  if (buttonPressed == 1) { // If no button is pressed, coinslot is disabled.
    coinSlotStatus = digitalRead(coinSlot); // wait to insert coins.
    delay(30);
    if (coinSlotStatus == LOW) {
      digitalWrite(LED, LOW);
      userBalance = true;
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print(" COINS INSERTED");
      pulse += 1;
      char lcdBuffer[16];
      sprintf(lcdBuffer, "Bal. PHP %d.00", pulse);
      lcd.setCursor(0, 1);
      lcd.print(lcdBuffer);
      delay(30);
    }
  } // INSERT COINS ends here.

  // VENDING the item selected

  vendingStatus = digitalRead(vending);
  if (vendingStatus == 0 && buttonPressed == 1 && pulse >= itemValues[selectedMenuItem]) {
    coinBalance = pulse - itemValues[selectedMenuItem];
    buttonPressed = 0;
    userBalance = false;
    servos[selectedMenuItem].write(180); // Rotate the selected servo
    delay(2000);
    servos[selectedMenuItem].write(0); // Stop rotating the selected servo
    vendingDisplay();
    pulse = coinBalance;
  }
}

void vendingDisplay() {
  lcd.clear();
  delay(500);
  char lcdBuffer[16];
  sprintf(lcdBuffer, "  Bal. PHP%d.00", coinBalance);
  lcd.setCursor(0, 0);
  lcd.print("  ITEM  VENDED");
  lcd.setCursor(0, 1);
  lcd.print(lcdBuffer);
  delay(2000);
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("   THANK  YOU");
  delay(2000);
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("  PLEASE PRESS");
  lcd.setCursor(0, 1);
  lcd.print("  ITEM  BUTTON");
}