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

#define pinCLK 2  // Pino CLK do encoder
#define pinDT 3   // Pino DT do encoder
#define pinSW 4   // Pino do botão do encoder

LiquidCrystal_I2C lcd(0x27, 16, 2);

const int numMenus = 3;
const char* menus[numMenus] = {"Saude", "Lojas", "Escola"};
const char* saudeMessages[] = {"1", "2", "3"};
const char* lojasMessages[] = {"M1", "M2", "M3"};
const char* escolaMessages[] = {"Me1", "Me2", "Me3"};

volatile int lastCLKState = HIGH;
int currentMenu = 0;
int currentMessage = 0;
bool lastButtonState = HIGH;
unsigned long lastDebounceTime = 0;
const unsigned long debounceDelay = 50;

void setup() {
  Serial.begin(9600);

  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Tecnologia");
  lcd.setCursor(0, 1);
  lcd.print("Assistiva");
  delay(2000);
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Menu: ");
  lcd.setCursor(6, 1);
  lcd.print(menus[currentMenu]);

  pinMode(pinCLK, INPUT);
  pinMode(pinDT, INPUT);
  pinMode(pinSW, INPUT_PULLUP);
}

void loop() {
  int CLKState = digitalRead(pinCLK);

  if (CLKState != lastCLKState) {
    if (digitalRead(pinDT) != CLKState) {
      currentMenu = (currentMenu + 1) % numMenus;
    } else {
      currentMenu = (currentMenu - 1 + numMenus) % numMenus;
    }
    updateMenuDisplay();
    delay(50);  // Pequeno atraso para evitar leituras falsas
  }

  lastCLKState = CLKState;

  int buttonState = digitalRead(pinSW);
  
  if (buttonState != lastButtonState) {
    lastDebounceTime = millis();
  }

  if ((millis() - lastDebounceTime) > debounceDelay) {
    if (buttonState == LOW) {
      currentMessage = (currentMessage + 1) % 3;
      displayMessage();
    }
  }

  lastButtonState = buttonState;
}

void updateMenuDisplay() {
  lcd.setCursor(0, 1);
  lcd.print("                ");  // Limpa a linha do menu anterior
  lcd.setCursor(0, 0);
  lcd.print("Menu: ");
  lcd.setCursor(6, 1);
  lcd.print(menus[currentMenu]);
}

void displayMessage() {
  lcd.setCursor(0, 1);
  lcd.print("                ");  // Limpa a linha da mensagem anterior

  const char* currentMessagePtr = nullptr;

  switch (currentMenu) {
    case 0:
      currentMessagePtr = saudeMessages[currentMessage];
      break;
    case 1:
      currentMessagePtr = lojasMessages[currentMessage];
      break;
    case 2:
      currentMessagePtr = escolaMessages[currentMessage];
      break;
  }

  lcd.setCursor(0, 1);
  lcd.print(currentMessagePtr);

  delay(2000); // Mostrar mensagem por 2 segundos
  lcd.clear();
  updateMenuDisplay();
}