/* Written by: Zuzanna
   Last update: 1st March 2024.

   This file contains code for Rewise GFG Steelworks Retrofit - Support Office Sector.
   Lookout for line with star symbol or // - these are comments that are here to guide you through the code.

  --------------------------
  These are wiring instructions (sensor -> arduino)
  --------------------------
   Display - Arduino Nano
     GND  -> GND
     5V  -> 5V
     DIN -> Pin 11
     CS -> Pin 10
     CLK -> Pin 13

  --------------------------
   Button - Arduino Nano
     + -> Pin 8
     - -> GND
*/

//------------------ LIBRARIES ------------------
#include "LedControl.h"

#define DIN_PIN 11
#define CS_PIN 10
#define CLK_PIN 13
#define BUTTON_PIN 8

//------------------ CREATING INSTANCES ------------------
LedControl lc = LedControl(DIN_PIN, CLK_PIN, CS_PIN, 1);

//------------------ VARIABLES ------------------
int buttonState = 0;
int lastButtonState = 0;
int currentLED = 0;

//------------------------ VOID SETUP()------------------------
void setup() {
  lc.shutdown(0, false);  // Wake up MAX7219
  lc.setIntensity(0, 3);   // Set brightness (0 to 15)

  // Display all LEDs
  for (int i = 0; i < 8; i++) {
    for (int j = 0; j < 8; j++) {
      lc.setLed(0, i, j, true);
      delay(70); // Adjust delay if needed
    }
  }
  
  pinMode(BUTTON_PIN, INPUT_PULLUP);
}

//------------------------ VOID LOOP()------------------------
void loop() {
  buttonState = digitalRead(BUTTON_PIN);

  if (buttonState == LOW && lastButtonState == HIGH) {
    // Button pressed
    lc.setLed(0, currentLED % 8, currentLED / 8, false);
    currentLED++;

    if (currentLED == 64) {    
      lc.clearDisplay(0);  // Turn OFF all LEDs, restart
      currentLED = 0;
    }
  }

  lastButtonState = buttonState;
}