// Neopixel
// setPixelColor
// show();
// clear
// begin

#include <MD_MAX72xx.h>

#define MAX_DEVICES 1
#define CS_PIN 10

#define vpin  A0
#define hpin  A1
#define sel   2

int ver;
int hor;
int L3;

int largo = 3;

int headx = 0;
int heady = 2;


int manzanaY;
int manzanaX;


int posX[64] = {0,0,0};
int posY[64] = {2,1,0};

int donde = 1;

MD_MAX72XX md = MD_MAX72XX(MD_MAX72XX::PAROLA_HW, 11, 13, 10, MAX_DEVICES);

 void manzaN(){
    manzanaX = random(0,8);
    manzanaY = random(0,8);
    md.setPoint(manzanaY,manzanaX,true);
    delay(200);
  }

void over(){
  md.setRow(0, 0xFF);
  md.setRow(1, 0xFF);
  md.setRow(2, 0xFF);
  md.setRow(3, 0xFF);
  md.setRow(4, 0xFF);
  md.setRow(5, 0xFF);
  md.setRow(6, 0xFF);
  md.setRow(7, 0xFF);
}

void setup() {
  md.begin();
  randomSeed(analogRead(A5));
  pinMode(vpin, INPUT);
  pinMode(hpin, INPUT);
  pinMode(sel, INPUT_PULLUP);
  Serial.begin(9600);
  
}

void loop() {
  ver = analogRead(vpin);
  hor = analogRead(hpin);
  L3 = digitalRead(sel);
  int i = largo - 1;

  if(ver<300){
    donde = 1; 
  }
  else if(ver>700){
    donde = 2;  
  }
  else if(hor<300){
    donde = 3;
  }
  else if(hor>700){
    donde = 4;
  }

if(donde == 1){heady++;}
if(donde == 2){heady--;}
if(donde == 3){headx--;}
if(donde == 4){headx++;}

if(headx<0)
  headx = 7;
  if(headx>7)
  headx = 0;
  if(heady<0)
  heady = 7;
  if(heady>7)
  heady = 0;

  
  
    md.setPoint(posY[i],posX[i],false);
    while(i > 0){
      posY[i] = posY[i-1];
      posX[i] = posX[i-1];
      md.setPoint(posY[i],posX[i],true);
      i--;
      if(headx == posX[i] && heady == posY[i]){
  over();}
    }
    posY[0] = heady;
    posX[0] = headx;
  
  md.setPoint(heady,headx,true);
  
  md.setPoint(manzanaY,manzanaX,true);

  
  
  if(manzanaX == headx && manzanaY == heady){
    manzaN();
    largo++;
    }
  
delay(500);
}