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

// Pin definitions (adjust for your board/shield)
#define TFT_CS   10
#define TFT_DC    9
#define TFT_RST   8

#define TFT_MOSI   11
#define TFT_SCK    13
#define TFT_MISO   12 

Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC, TFT_RST);

// Button coordinates
#define BTN1_X 30
#define BTN1_Y 200
#define BTN2_X 130
#define BTN2_Y 200
#define BTN_W  80
#define BTN_H  40

// State variables
bool running = false;

void drawHeader() {
  tft.fillRect(0, 0, tft.width(), 30, ILI9341_NAVY);
  tft.setTextColor(ILI9341_WHITE);
  tft.setTextSize(2);
  tft.setCursor(10, 8);
  tft.print("ILI9341 Arduino UI Demo");
}

void drawStatus(const char* msg) {
  tft.fillRect(0, 40, tft.width(), 20, ILI9341_BLACK);
  tft.setTextColor(ILI9341_YELLOW);
  tft.setTextSize(2);
  tft.setCursor(10, 42);
  tft.print(msg);
}

void drawButtons() {
  // Start button
  tft.fillRect(BTN1_X, BTN1_Y, BTN_W, BTN_H, ILI9341_GREEN);
  tft.setTextColor(ILI9341_BLACK);
  tft.setTextSize(2);
  tft.setCursor(BTN1_X + 10, BTN1_Y + 12);
  tft.print("Start");

  // Stop button
  tft.fillRect(BTN2_X, BTN2_Y, BTN_W, BTN_H, ILI9341_RED);
  tft.setTextColor(ILI9341_WHITE);
  tft.setCursor(BTN2_X + 10, BTN2_Y + 12);
  tft.print("Stop");
}

void drawDemoGraphics() {
  tft.fillCircle(80, 120, 40, ILI9341_CYAN);
  tft.fillRect(160, 80, 100, 80, ILI9341_MAGENTA);
  tft.drawTriangle(60, 160, 100, 200, 20, 200, ILI9341_YELLOW);
}

void setup() {
  tft.begin();
  tft.setRotation(1); // Landscape
  tft.fillScreen(ILI9341_BLACK);

  drawHeader();
  drawStatus("Ready");
  drawDemoGraphics();
  drawButtons();
}

void loop() {
  if (running) {
    // Example animation: bouncing line
    static int x = 0;
    static int dx = 3;

    tft.drawLine(x, 150, x, 170, ILI9341_WHITE);
    delay(30);
    tft.drawLine(x, 150, x, 170, ILI9341_BLACK); // erase

    x += dx;
    if (x < 0 || x > tft.width()) dx = -dx;
  }
}

// In a real project, you’d add touch input handling here
// to detect taps on Start/Stop buttons and set `running = true/false`.