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

// TFT display pins
#define TFT_CS    10
#define TFT_RST   9
#define TFT_DC    8

// Joystick pins
#define JOY_HORZ A0
#define JOY_VERT A1
#define JOY_SEL  7  // Optional button pin

// Initialize the display
Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC, TFT_RST);

// Ball position and properties
int ballX = 120;
int ballY = 160;
const int ballRadius = 5;

void setup() {
  tft.begin();
  tft.fillScreen(ILI9341_BLACK);
  tft.fillCircle(ballX, ballY, ballRadius, ILI9341_RED);
}

void loop() {
  int xVal = analogRead(JOY_HORZ);
  int yVal = analogRead(JOY_VERT);

  // Deadzone to avoid drift
  int threshold = 100;
  int dx = 0, dy = 0;

  // Inverted horizontal direction
  if (xVal < 512 - threshold) dx = 1;   // right
  if (xVal > 512 + threshold) dx = -1;  // left

  if (yVal < 512 - threshold) dy = 1;   // down
  if (yVal > 512 + threshold) dy = -1;  // up

  // Erase previous ball
  tft.fillCircle(ballX, ballY, ballRadius, ILI9341_BLACK);

  // Update position
  ballX += dx * 2;
  ballY += dy * 2;

  // Keep ball within screen bounds
  ballX = constrain(ballX, ballRadius, tft.width() - ballRadius);
  ballY = constrain(ballY, ballRadius, tft.height() - ballRadius);

  // Draw new ball
  tft.fillCircle(ballX, ballY, ballRadius, ILI9341_RED);

  delay(20);
}