#include <Adafruit_GFX.h>         // Core graphics library
#include <Adafruit_ILI9341.h>     // ILI9341 driver for TFT
#include <TouchScreen.h>          // Touchscreen library

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

// Touchscreen pins (analog pins for XP, YP, and digital pins for XM, YM)
#define YP A3  // Must be an analog pin, use "A" prefix
#define XM A2  // Must be an analog pin, use "A" prefix
#define YM 9   // Can be a digital pin
#define XP 8   // Can be a digital pin

// Calibration for touch screen
#define TS_MINX 150
#define TS_MAXX 920
#define TS_MINY 120
#define TS_MAXY 900

// Threshold for pressure sensing
#define MINPRESSURE 10
#define MAXPRESSURE 1000

// Initialize TFT and touch screen objects
Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC, TFT_RST);
TouchScreen ts = TouchScreen(XP, YP, XM, YM, 300);

void setup() {
  Serial.begin(9600);

  // Initialize the TFT display
  tft.begin();
  tft.setRotation(1);  // Set rotation for landscape mode, change as needed
  tft.fillScreen(ILI9341_BLACK); // Clear the screen to black

  // Display initial message
  tft.setTextSize(2);
  tft.setTextColor(ILI9341_WHITE);
  tft.setCursor(40, 100);
  tft.print("Touch the screen");

  // Draw a test rectangle to detect touch
  tft.drawRect(50, 150, 120, 60, ILI9341_RED);
}

void loop() {
  // Read the touch point
  TSPoint p = ts.getPoint();

  // If pressure is within a valid range
  if (p.z > MINPRESSURE && p.z < MAXPRESSURE)
   {
    // Map the touch coordinates to the display coordinates
    int x = map(p.x, TS_MINX, TS_MAXX, 0, tft.width());
    int y = map(p.y, TS_MINY, TS_MAXY, 0, tft.height());

    // Check if the touch is within the rectangle drawn on the screen
    if (x > 50 && x < 170 && y > 150 && y < 210) {
      // Change the rectangle color on touch
      tft.fillRect(50, 150, 120, 60, ILI9341_GREEN);
      tft.setCursor(60, 165);
      tft.setTextColor(ILI9341_BLACK);
      tft.print("Touched!");
      delay(500);  // Wait before resetting the rectangle

      // Reset the rectangle after a delay
      tft.fillRect(50, 150, 120, 60, ILI9341_RED);
    }

    // Debug output: Print the touch coordinates
    Serial.print("X = "); Serial.print(x);
    Serial.print("\tY = "); Serial.print(y);
    Serial.print("\tPressure = "); Serial.println(p.z);
  }

  // Reset the pin modes for touch after reading
  pinMode(XM, OUTPUT);
  pinMode(YP, OUTPUT);
}