#include <TM1637.h>              // Grove 4-Digit Display
#include <Wire.h>
#include <LiquidCrystal_I2C.h>   // Pantalla I2C

const int CLK = 19;
const int DIO = 18;
TM1637 tm(CLK, DIO);             // TM1637 display

#define I2C_ADDR 0x27
LiquidCrystal_I2C lcd(I2C_ADDR, 20, 4);  // LCD I2C 20x4

// Estructura para botón
struct Button {
  const uint8_t PIN;
  bool pressed;
  uint32_t lastDebounceTime;
};

Button button_up = {17, false, 0};
Button button_down = {16, false, 0};

volatile int counter = 0;
const uint32_t debounceDelay = 50; // ms para antirrebote

// ISR para botón UP
void IRAM_ATTR isr_button_up() {
  uint32_t currentTime = millis();
  if ((currentTime - button_up.lastDebounceTime) > debounceDelay) {
    button_up.lastDebounceTime = currentTime;
    button_up.pressed = true;
    counter++;
  }
}

// ISR para botón DOWN
void IRAM_ATTR isr_button_down() {
  uint32_t currentTime = millis();
  if ((currentTime - button_down.lastDebounceTime) > debounceDelay) {
    button_down.lastDebounceTime = currentTime;
    button_down.pressed = true;
    counter--;
  }
}

void setup() {
  Serial.begin(115200);
  Serial.println("Iniciando...");

  // Configurar botones
  pinMode(button_up.PIN, INPUT_PULLUP);
  pinMode(button_down.PIN, INPUT_PULLUP);
  attachInterrupt(button_up.PIN, isr_button_up, FALLING);
  attachInterrupt(button_down.PIN, isr_button_down, FALLING);

  // Inicializar TM1637
  tm.init();
  tm.set(BRIGHT_TYPICAL);

  // Inicializar LCD
  lcd.init();
  lcd.backlight();
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Motor:");

  delay(200);
}

void loop() {
  static int lastValue = -999;

  // Si hubo cambio
  if (button_up.pressed || button_down.pressed) {
    button_up.pressed = false;
    button_down.pressed = false;

    Serial.printf("Contador: %d\n", counter);

    // Mostrar en LCD
    lcd.setCursor(0, 1);
    lcd.print("Contador:      ");
    lcd.setCursor(10, 1);
    lcd.print(counter);

    // Mostrar en display 7 seg (máx. 4 dígitos)
    int val = constrain(counter, -999, 9999);  // prevenir overflow
    tm.displayNum(val, true);  // true: padding con ceros si necesario

    lastValue = counter;
  }

  // Después de 1 minuto: desactiva interrupciones (solo para prueba)
  static uint32_t lastMillis = 0;
  if (millis() - lastMillis > 60000) {
    lastMillis = millis();
    detachInterrupt(button_up.PIN);
    detachInterrupt(button_down.PIN);
    Serial.println("Interrupciones deshabilitadas.");
  }
}