#define DEBUG
 
#include <Keypad.h>
#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
 
// Definir constantes
#define ANCHO_PANTALLA 128 // ancho pantalla OLED
#define ALTO_PANTALLA 64 // alto pantalla OLED

/* Keypad setup */
const byte KEYPAD_ROWS = 4;
const byte KEYPAD_COLS = 4;
byte rowPins[KEYPAD_ROWS] = {13, 12, 11, 10};
byte colPins[KEYPAD_COLS] = {9, 8, 7, 6};
char keys[KEYPAD_ROWS][KEYPAD_COLS] = {
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'}
};
 
// Objeto de la clase Adafruit_SSD1306
Adafruit_SSD1306 display(ANCHO_PANTALLA, ALTO_PANTALLA, &Wire, -1);
 
Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, KEYPAD_ROWS, KEYPAD_COLS);

int tonePin = 5;
char key;
double number = 0;
double seconds = 0;
char letter;
bool showFirst = false;
bool pressedA = false;
uint64_t value = 0;
bool menu = true;

void setup() {
#ifdef DEBUG
  Serial.begin(9600);
  delay(100);
  Serial.println("Iniciando pantalla OLED");
#endif
 
  // Iniciar pantalla OLED en la dirección 0x3C
  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
#ifdef DEBUG
    Serial.println("No se encuentra la pantalla OLED");
#endif
    while (true);
  }
  
}

void loop() {

  while(menu)
  {
    display.clearDisplay();
  int16_t x, y;
  uint16_t textWidth, textHeight;
  const char strHello[] = "Oprima A";
  display.setTextSize(1);
  display.setTextColor(WHITE, BLACK);
  display.getTextBounds(strHello, 0, 0, &x, &y, &textWidth, &textHeight);
  display.setCursor(display.width() / 2 - textWidth / 2, display.height() / 2 - textHeight / 2);
  display.print(strHello);
  display.display();
    key = keypad.getKey();
    Serial.println(key);
    if(key == 'A') {
      pressedA=true;
      menu=false;
    }
  }
  keypadInput();
}

void keypadInput(){
  //Capturamos los datos del teclado
  key = keypad.getKey();
  Serial.println(key);
  switch(key)
  {
    case '0' ... '9':
      showFirst=true;
      number = number * 10 + (key - '0');
      showDisplay();  
      break;
    case 'A':
      showFirst=true;
      letter="A";
      showDisplay();
      break;
    case 'B':
      showFirst=true;
      letter="B";
      showDisplay();
      break;
    case 'C':
      showFirst=true;
      letter="C";
      seconds = number * 1000;
      beep(932,seconds);
      //INICIAR ZUMBADOR
      showDisplay();
      break;
    case 'D':
      showFirst=false;
      letter="D";
      number=0;
      seconds=0;
      showDisplay();
      break;
  }
}

void beep(int note, int duration){
  tone(tonePin, note, duration);
}

void showDisplay(){
  display.clearDisplay();
  int16_t x, y;
  uint16_t textWidth, textHeight;
  display.setTextSize(1);
  display.setTextColor(WHITE, BLACK);
  display.setCursor(0,0);
  display.println("ingrese los segundos");
  display.setCursor(0,30);
  //display.println(Operator);
  if (showFirst) {
    Serial.print(number);
    display.println(number);
  } 
  else
  {
    display.clearDisplay();
    display.println("");
  }
  display.display();
}