#include <MD_Parola.h>
#include <MD_MAX72xx.h>
#include <SPI.h>

#define HARDWARE_TYPE MD_MAX72XX::PAROLA_HW // Use PAROLA_HW for 8x8 matrix
#define MAX_DEVICES 4
#define CLK_PIN 13
#define DATA_PIN 11
#define CS_PIN 10
#define PIR_PIN 2 // PIR sensor pin

MD_Parola P = MD_Parola(HARDWARE_TYPE, CS_PIN, MAX_DEVICES);

bool lastMotionState = false;  // Flag to track the last motion state

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

  // Initialize LED Matrix
  P.begin();
  P.setIntensity(5); // Adjust brightness level (0-15)
  P.displayClear();   // Clear the display at startup

  // Initialize PIR sensor
  pinMode(PIR_PIN, INPUT);

  // Initially display "No Motion Detected"
  P.displayText("No Motion", PA_CENTER, 50, 0, PA_SCROLL_LEFT, PA_SCROLL_LEFT); // Smooth scroll once
  delay(2000);  // Wait for a brief period before detecting motion
}

void loop() {
  // Read PIR sensor state
  int motionDetected = digitalRead(PIR_PIN);

  if (motionDetected == HIGH && !lastMotionState) {
    // Motion has been detected, update display to "Motion Detected"
    Serial.println("Motion Detected!");
    P.displayClear();  // Clear previous message
    P.displayText("Motion Detected", PA_CENTER, 50, 0, PA_SCROLL_LEFT, PA_SCROLL_LEFT); // Smooth fast scroll
    lastMotionState = true;  // Update the state to motion detected
  } 
  else if (motionDetected == LOW && lastMotionState) {
    // No motion, update display to "No Motion"
    Serial.println("No Motion");
    P.displayClear();  // Clear previous message
    P.displayText("No Motion", PA_CENTER, 50, 0, PA_SCROLL_LEFT, PA_SCROLL_LEFT); // Smooth fast scroll
    lastMotionState = false;  // Update the state to no motion detected
  }

  // Allow enough time for the display to update
  if (P.displayAnimate()) {
    // No reset needed here, let the text scroll naturally
  }

  delay(100); // Short delay for smooth performance
}