#include <LedControl.h>

#define DIN 12
#define CLK 11
#define CS  10
#define COUNT 1 //number of matrices attached

LedControl lc = LedControl(DIN, CLK, CS, COUNT); // create an object to control
//  lc.setLed(4, 3, 2, 1); // (object) lc (panel=4, x=3, y=2, state=1)

// variables
unsigned long previousTime = 0, interval = 500;
bool state = 0;
long a, b;

// interrupt variables
volatile bool button; // type volatile for interrupt handler
int buttonPin = 2; // interrupt pin INT0
int count = 0; // indicates the button was pressed
int cases = 7; // number of functions available

void setup() {
  Serial.begin(115200);
  randomSeed(analogRead(A0)); // increase randomness
  pinMode(buttonPin, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(buttonPin), buttonISR, FALLING); // INT#, ISR, TRIGGER

  Serial.print("Press the button to start animations.\nAnimation: ");
  Serial.print(count);
}

void loop() { // add a function, comment-out unused functions
  if (button) { // check button flag after returning from ISR
    delay(150); // debounce the button
    button = 0; // reset ISR flag for the next interrupt/button press
    count++; // increment selected pattern/case
    if (count > cases) { // if counter reached last case...
      count = 1; // ... reset counter to first case
    }
    Serial.print(count);
  }

  switch (count) {
    case 0: blink(); break;
    case 1: blinkDelay(); break;
    case 2: rain(); break;
    case 3: down(); break;
    case 4: flash(); break;
    case 5: life(); break;
    case 6: scan(); break;
    case 7: wax(); break;
  }
}

int buttonISR() {
  noInterrupts(); // disable interrupts while in the ISR
  button = 1; // set the flag that the button was pressed
  interrupts(); // enable interrupts when leaving the ISR
}

void blink() {
  unsigned long currentTime = millis();
  if (currentTime - previousTime >= interval) {
    previousTime = currentTime; // update timer
    state = !state;
  }
  lc.setLed(0, 0, 0, state); // panel 0, x = 0, y = 0, ON/OFF
}

void blinkDelay() {
  state = !state;
  lc.setLed(0, 0, 0, state);
  delay(500);
}

void rain() {
  if (!state) {
    a = random(8), b = random(8);
    state = 1;
  }

  long c = random(-1, 2), d = random(-1, 2); // long random (min, max-1);
  a += c;
  b += d;
  if (a > 7)    a = 0;
  if (a < 0)    a = 7;
  if (b > 7)    b = 0;
  if (b < 0)    b = 7;

  lc.setLed(0, a, b, 1);
  delay(100);
}

void down() {
  if (b == 7) {
    b = -1;
    if (a == 7) {
      a = -1;
    }
    a++;
  }
  b++;
  lc.setLed(0, a, b, 1);
  delay(100);
  lc.setLed(0, a, b, 0);
}

void flash() {
  int wait = 200;
  for (int i = 0; i < 8; i++)
    for (int j = 0; j < 8; j++)
      lc.setLed(0, i, j, 1);
  delay(wait);
  for (int i = 0; i < 8; i++)
    for (int j = 0; j < 8; j++)
      lc.setLed(0, i, j, 0);
  delay(wait);
}

void life() {
  int x = random(8);
  int y = random(8);
  int z = random(2);

  if (z)
    lc.setLed(0, x, y, 0);
  else
    lc.setLed(0, x, y, 1);
  delay(10);
}

void scan() {
  int wait = 150;
  for (int i = 7; i > 0; i--) {
    for (int j = 0; j < 8; j++) {
      lc.setLed(0, i, j, 1);
      lc.setLed(0, j, i, 1);
    }
    delay(wait);
    for (int j = 0; j < 8; j++) {
      lc.setLed(0, i, j, 0);
      lc.setLed(0, j, i, 0);
    }
  }
  for (int i = 0; i < 7; i++) {
    for (int j = 0; j < 8; j++) {
      lc.setLed(0, i, j, 1);
      lc.setLed(0, j, i, 1);
    }
    delay(wait);
    for (int j = 0; j < 8; j++) {
      lc.setLed(0, i, j, 0);
      lc.setLed(0, j, i, 0);
    }
  }
}

void wax() {
  lc.setLed(0, a, b, !state);
  a++;
  if (a > 7) {
    a = 0;
    b++;
    if (b > 7) {
      b = 0;
      state = !state;
    }
  }
  delay(50);
}