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

#define HARDWARE_TYPE MD_MAX72XX::PAROLA_HW
#define MAX_DEVICES 11

#define CLK_PIN   13
#define DATA_PIN  11
#define CS_PIN    10


#define inputPin 2 // which input pin is connected to button *
const int debounceDelay = 10; // milliseconds to wait until button input stable *


#define LED 8  // The pin the button-LED is connected to


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

void setup() {

P.begin(); 
  // put your setup code here, to run once
  Serial.begin(9600); // initializes serial monitor for troubleshooting and learning
  pinMode(inputPin, INPUT); // make button pin mode input *
  digitalWrite(inputPin, HIGH); //turn on internal pull-up on pin and set resting state to HIGH *
  attachInterrupt(digitalPinToInterrupt(inputPin), buttonPushed, LOW); // assign interrupt to button, procedure to be run and set state to LOW when pushed *
  pinMode(LED, OUTPUT); // Declare the button-LED as an output


}

void loop() {
  if (P.displayAnimate()){
    P.displayText("I love Swinburne", PA_CENTER, P.getSpeed(), P.getPause(), PA_NO_EFFECT);
  }
  delay(50);// pause to read serial monitor output
}

void buttonPushed() { 	// detect and debounce button push using assigned interrupt *
  if (debounce(inputPin)) { // calls debounce procedure *
  
    P.displayText("James Prendergast", PA_CENTER, P.getSpeed(), P.getPause(), PA_SCROLL_RIGHT);
    digitalWrite(LED, LOW); // Turn the button-LED back off
  }
}


// debounce returns true if the switch in the given pin is closed and stable
boolean debounce(int pin)
{
  boolean state;
  boolean previousState;
  previousState = digitalRead(pin); // store switch state
  for (int counter = 0; counter < debounceDelay; counter++)
  {
    delay(1); // wait for 1 millisecond
    state = digitalRead(pin); // read the pin
    if ( state != previousState)
    {
      counter = 0; // reset the counter if the state changes
      previousState = state; // and save the current state
    }
  }
  // here when the switch state has been stable longer than the debounce period
  return state;
}