#include <LiquidCrystal.h>
#include <ezButton.h>

ezButton buttonL(A3);
ezButton buttonR(A2);
ezButton buttonU(A1);
ezButton buttonD(A0);

int ver = A0;
int hor = A1;
int V;
int H;
int i = 0;
int d = 1;


LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
int x = 0; //0-19
int xm = x;
int xmm = xm;
int y = 0; //0-3
int ym = y;
int ymm = ym;
int dir = 0; //0=Left, 1= Right, 2=Up, 3=Down
int dir1;

  //SnakePixels
    byte snakeBody[8] = {
      0b00000,
      0b11111,
      0b11111,
      0b11111,
      0b11111,
      0b11111,
      0b11111,
      0b00000
    };

    byte snakeRight[8] = {
      0b00000,
      0b11111,
      0b11001,
      0b11111,
      0b11111,
      0b11001,
      0b11111,
      0b00000
    };

    byte snakeLeft[8] = {
      0b00000,
      0b11111,
      0b10011,
      0b11111,
      0b11111,
      0b10011,
      0b11111,
      0b00000
    };

    byte snakeUp[8] = {
      0b00000,
      0b11111,
      0b10101,
      0b10101,
      0b11111,
      0b11111,
      0b11111,
      0b00000
    };

    byte snakeDown[8] = {
      0b00000,
      0b11111,
      0b11111,
      0b11111,
      0b10101,
      0b10101,
      0b11111,
      0b00000
    };

void snake(int x, int row, int column){
    lcd.setCursor(row,column);
    lcd.write((byte)x);
 }

void posCheck(){
  i = 200;
  while(i != 0){
    i--;
    delay(1);
    conCheck();
  }
  if(dir==0){ 
    x++;
    }else if(dir==1){
    x--;
      }else if(dir==2){
      y++;
        }else if(dir==3){
        y--;
        }
  if(dir==0 & x==20){
    x = 0;
  }
  if(dir==1 & x==-1){
    x = 19;
  }
  if(dir==2 & y==4){
    y = 0;
  }
  if(dir==3 & y==-1){
    y = 3;
  }
 }

void conCheck(){ //0=Left, 1= Right, 2=Up, 3=Down
   V=analogRead(ver);
  H=analogRead(hor);

  if (V==512 && H==512){ //middle
  }
  else if (V==512 && H==1023){ //left
    x--;
    dir = 1;
    d = 2;
    delay(30);
  }
  else if (V==512 && H==0){ //right
    x++;
    dir = 0;
    d = 1;
    delay(30);
  }
  else if (V==1023 && H==512){ //up
    y--;
    dir = 3;
    d = 3;
    delay(30);
  }
  else if (V==0 && H==512){ //down
    y++;
    dir = 2;
    d = 4;
    delay(30);
  }
 }

void setup() {
 lcd.begin(20, 4);
 Serial.begin(9600);
  lcd.createChar(0, snakeBody);
  lcd.createChar(1, snakeRight);
  lcd.createChar(2, snakeLeft);
  lcd.createChar(3, snakeUp);
  lcd.createChar(4, snakeDown);
  pinMode(ver, INPUT);
  pinMode(hor, INPUT);
}

void loop() {
  posCheck();
  lcd.clear();
  snake(d, x, y);


}