#include <LiquidCrystal.h>

#define SLC 0
#define LFT 1
#define RGH 2
#define LED 13

LiquidCrystal lcd(12, 11, 10, 9, 8, 7);

void initLCD();
byte menu();
void acenderLed();
void apagarLed();
void piscarLed();

void setup() {  
  initLCD();
  pinMode(SLC, INPUT_PULLUP);
  pinMode(LFT, INPUT_PULLUP);
  pinMode(RGH, INPUT_PULLUP);
  pinMode(LED, OUTPUT);
}

void loop() {
  switch(menu()){
    case 0:
      ligarLed();
      break;
    case 1:
      apagarLed();
      break;
    case 2:
      piscarLed();
      break;
    case 3:
      setup();
      break;
  }
}

void initLCD(){
  lcd.begin(16, 2);
  lcd.setCursor(16,0);
  lcd.print("Menu Arduino");
  for (int i=0; i < 16; i++) {
    lcd.scrollDisplayLeft();
    delay(80);
  }
  delay(1000);
  for (int i = 0; i < 16; i++) {
    lcd.scrollDisplayRight();
    delay(80);
  }
  delay(1000);
}

byte menu() {
  int opt = 0;
  const int maxOpt = 4;
  lcd.clear();
  bool key = false;

  while (digitalRead(SLC)){ // Mantém o menu enquanto SLC não for pressionado
    lcd.setCursor(2,0);
    lcd.print("< Escolha >");
    if (key && !digitalRead(RGH)) {
      lcd.clear();
      opt++;
    }
    if (key && !digitalRead(LFT)) {
      lcd.clear();
      opt--;
    }

   switch (opt) {
      case 0:
        lcd.setCursor(0,1);
        lcd.print("Ligar led");
        break;
      case 1:
        lcd.setCursor(3,1);
        lcd.print("Apagar led");
        break;
      case 2:
        lcd.setCursor(3,1);
        lcd.print("Piscar led");
        break;
      case 3:
        lcd.setCursor(4,1);
        lcd.print("Reset");
        break;
      case maxOpt:
        opt = 0;
        break;
      case -1:
        opt = maxOpt - 1;
        break;
    }
    // Trava dos botoes
    key = true;
    if (!digitalRead(LFT) || !digitalRead(RGH)) key = false;
    delay(90);
  }
  
  lcd.clear();
  while(!digitalRead(SLC));
  lcd.setCursor(0,1);
  lcd.print("Executando...");
  delay(1000);

  return opt;
 }

void ligarLed(){
  digitalWrite(LED, HIGH);
}

void apagarLed() {
  digitalWrite(LED, LOW);
}

void piscarLed() {
  for(int i=0;i<5;i++){
    ligarLed();
    delay(500);
    apagarLed();
    delay(500);
  }
}