#include <LiquidCrystal_I2C.h>
#include <EEPROM.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);

#define changeBTN 10
#define acceptBTN 11
#define settingBTN 12
#define relayRes 13

int changeBTNState;
int acceptBTNState;
int setDone;

int itemValues[16]; // Update the array to handle 16 items
int selectedItem = 0; // Initial item value

boolean settingsDone = false;

void setup() {
  lcd.init();
  lcd.backlight();
  lcd.clear();

  pinMode(changeBTN, INPUT_PULLUP);
  pinMode(acceptBTN, INPUT_PULLUP);
  pinMode(settingBTN, INPUT_PULLUP);
  pinMode(relayRes, OUTPUT);

  // Load item values from EEPROM
  for (int i = 0; i < 16; i++) { // Update the loop to handle 16 items
    itemValues[i] = EEPROM.read(i); // Read from EEPROM
  }
}

void loop() {
  settingsMenu();
}

void settingsMenu() {
  // Wait to press settingBTN
  if (digitalRead(settingBTN) == LOW) {
    setDone = 1;
    lcd.setCursor(0, 0);
    lcd.print(" SETTINGS  MENU");
    lcd.setCursor(0, 1);
    lcd.print("CHANGE THE PRICE");
    delay(1000);
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("CHANGE THE PRICE");
    lcd.setCursor(0, 1);
    displayItemValue(selectedItem + 1, itemValues[selectedItem]);
    settingsDone = true;
    delay(1000);
  }

  // After settingBTN is pressed, wait to press changeBTN
  if (settingsDone == true) {
    changeBTNState = digitalRead(changeBTN);
    if (changeBTNState == LOW && setDone == 1) {
      if (itemValues[selectedItem] < 99) {
        itemValues[selectedItem] += 1;
      } else {
        itemValues[selectedItem] = 0; // Reset to 0 if it reaches 99
      }
      displayItemValue(selectedItem + 1, itemValues[selectedItem]);
      delay(150);
    }
  }

  // Press acceptBTN to finish setting an item and move to the next one
  if (digitalRead(acceptBTN) == LOW && settingsDone) {
    selectedItem++;
    if (selectedItem >= 16) { // Check for all 16 items
      // All items are done, exit the settings
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("  ALL SETTINGS");
      lcd.setCursor(0, 1);
      lcd.print("    ARE DONE");
      settingsDone = false;

      // Save item values to EEPROM
      for (int i = 0; i < 16; i++) { // Update the loop to handle 16 items
        EEPROM.write(i, itemValues[i]); // Write to EEPROM
      }
      delay(1000);
      digitalWrite(relayRes, HIGH);
    } else {
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("CHANGE THE PRICE");
      lcd.setCursor(0, 1);
      displayItemValue(selectedItem + 1, itemValues[selectedItem]);
      delay(1000);
    }
  }
}

void displayItemValue(int itemNumber, int itemValue) {
  lcd.setCursor(0, 1);
  char lcdBuffer[16];
  sprintf(lcdBuffer, "ITEM %d: P%d.00", itemNumber, itemValue);
  lcd.print(lcdBuffer);
}