#include <Adafruit_GFX.h>
#include <Adafruit_ILI9341.h>

#define TFT_CS   5
#define TFT_DC   2
#define TFT_MOSI 23
#define TFT_CLK  18

#define CLK 34
#define DT 35
#define SW 32

Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC);

int lastStateCLK;
bool lightState = false;
int value = 0;

void setup() {
  Serial.begin(115200);

  pinMode(CLK, INPUT);
  pinMode(DT, INPUT);
  pinMode(SW, INPUT);

  tft.begin();
  tft.fillScreen(ILI9341_BLACK);

  tft.setTextColor(ILI9341_WHITE);
  tft.setTextSize(2);

  lastStateCLK = digitalRead(CLK);

  tft.setCursor(40, 100);
  tft.print("START");
}

void loop() {
  int currentStateCLK = digitalRead(CLK);

  if (currentStateCLK != lastStateCLK) {
    if (digitalRead(DT) != currentStateCLK) {
      value++;
    } else {
      value--;
    }

    tft.fillScreen(ILI9341_BLACK);
    tft.setCursor(40, 80);
    tft.print("Value:");
    tft.setCursor(60, 120);
    tft.print(value);
  }

  lastStateCLK = currentStateCLK;

  if (digitalRead(SW) == LOW) {
    lightState = !lightState;

    tft.fillScreen(ILI9341_BLACK);
    tft.setCursor(20, 100);

    if (lightState) {
      tft.print("LIGHT ON");
    } else {
      tft.print("LIGHT OFF");
    }

    delay(300);
  }
}