#include <SPI.h>
#include <Adafruit_GFX.h>
#include <Max72xxPanel.h>
//Vcc - Vcc
//Gnd - Gnd
//Din - Mosi (Pin 11)
//Cs  - SS (Pin 10)
//Clk - Sck (Pin 13)
int buttonPin = 2;
// variable to check if the button is pressed or not
int buttonState;
// helper variable to check if the button is pressed or not
int reading;
//// flag to determine on/off for the button
boolean onOffFlag = true;
//// last state of the button for debounce alg
int lastButtonState =  LOW;
//// the last time the output pin was toggled
unsigned long lastDebounceTime = 0;
//// the debounce time; increase if the output flickers
unsigned long debounceDelay = 50;
//// helper variable to check if the sensor detects movement or not
int movementState = LOW;
const int pinCS = 10;
const int numberOfHorizontalDisplays = 8;
const int numberOfVerticalDisplays = 1;
Max72xxPanel matrix = Max72xxPanel(pinCS, numberOfHorizontalDisplays, numberOfVerticalDisplays);
const int wait = 50; // Velocidad a la que realiza el scroll
const int spacer = 1;
const int width = 5 + spacer; // Ancho de la fuente a 5 pixeles
void setup(){
   Serial.begin(9600);
   matrix. setIntensity ( 1 ) ;  // Adjust the brightness between 0 and 15
   matrix. setPosition ( 0 ,  0 ,  0 ) ;  // The first display is at <0, 0>
   matrix. setPosition ( 1 ,  1 ,  0 ) ;  // The second display is at <1, 0>
   matrix. setPosition ( 2 ,  2 ,  0 ) ;  // The third display is in <2, 0>
   matrix. setPosition ( 3 ,  3 ,  0 ) ;  // The fourth display is at <3, 0>
   matrix. setPosition ( 4 ,  4 ,  0 ) ;  // The fifth display is at <4, 0>
   matrix. setPosition ( 5 ,  5 ,  0 ) ;  // The sixth display is at <5, 0>
   matrix. setPosition ( 6 ,  6 ,  0 ) ;  // The seventh display is at <6, 0>
   matrix. setPosition ( 7 ,  7 ,  0 ) ;  // The eighth display is in <7, 0>
   matrix. setPosition ( 8 ,  8 ,  0 ) ;  // The ninth display is at <8, 0>
   matrix. setRotation ( 0 ,  1 ) ;     // Display position
   matrix. setRotation ( 1 ,  1 ) ;     // Display position
   matrix. setRotation ( 2 ,  1 ) ;     // Display position
   matrix. setRotation ( 3 ,  1 ) ;     // Display position
   matrix. setRotation ( 4 ,  1 ) ;     // Display position
   matrix. setRotation ( 5 ,  1 ) ;     // Display position
   matrix. setRotation ( 6 ,  1 ) ;     // Display position
   matrix. setRotation ( 7 ,  1 ) ;     // Display position
   matrix. setRotation ( 8 ,  1 ) ;     // Display position
   pinMode(buttonPin, INPUT_PULLUP);
}

void loop() {
  
   String string = " Acesta este proiectul meu la PM";
   long int time = millis();
   while(Serial.available() && onOffFlag) {
      string += char(Serial.read());
   }
   for(int i = 0; i < width * string.length() + matrix.width() - 1 - spacer && onOffFlag; i++) {
       
       buttonState = digitalRead(buttonPin);
   // for (int i = 0; i < BUTTONS_NO; i++) {
      /* compare the buttonState to its previous state */
      if (buttonState != lastButtonState) {
        /* if the state has changed, increment the counter */
        if (buttonState == HIGH) {
            /* if the current state is HIGH then the button went from off to on */
            delay(3000);
            onOffFlag = true;

        } else {
            /* if the current state is LOW then the button went from on to off */
            delay(3000);
            onOffFlag = false;
        }
        
        // Delay a little bit to avoid bouncing
        delay(50);
      }
      // save the current state as the last state, for next time through the loop
      lastButtonState = buttonState;
      matrix.fillScreen(LOW);
      int letter = i / width;
      int x = (matrix.width() - 1) - i % width;
      int y = (matrix.height() - 8) / 2; // Centrar el texto
      while(x + width - spacer >= 0 && letter >= 0) {
         if(letter < string.length()){
             matrix.drawChar(x, y, string[letter], HIGH, LOW, 1);
         }
         letter--;
         x -= width;
      }
      matrix.write(); // Muestra loscaracteres
      delay(wait);
   }
}