#include <MD_MAX72xx.h>
#include <ezButton.h>
const byte data_pin=11;
const byte chip_select_pin=10;
const byte clock_pin=13;
const byte max_devices=4;
const byte vpin=A0;
const byte hpin=A1;
int head_x=0;
int head_y=0;
int flag=0;
int gameState=0;
ezButton button(8);
int snake_x[64];
int snake_y[64];
int snake_length=2;
long int current_time, prev_time=0;
int threshold=800;
int food_x=random(0,8);
int food_y=random(0,8);
String direction="",prev_direction="";
int max_x=31, max_y=7;
MD_MAX72XX matrix=MD_MAX72XX(MD_MAX72XX::PAROLA_HW,chip_select_pin,max_devices);

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  matrix.begin();
  matrix.clear();
  button.setDebounceTime(25);
  //matrix.setPoint(head_x, head_y, true);
  show_message("WELCOME");


}

void loop() {
  if(gameState==0){

  
  // put your main code here, to run repeatedly:
  //Serial.print(analogRead(hpin));
  //Serial.print("\t");
  //Serial.println(analogRead(vpin));
  //button.loop();
  current_time=millis();
   checkDirection();
  

  if(current_time-prev_time>=threshold){
    prev_time=current_time;
    matrix.clear();
    move_sprite();
    update_snake();
    draw_sprites();
  }
  food_eat_check();
  snake_collision_check();
  }
  if(gameState==1){
    show_message("You Won");

  }
  if(gameState==2){
    show_message("Game Over");
  }  
  if(gameState){
  while(true){
    button.loop();
    if(button.isPressed()){
      head_y=0, head_x=0, snake_length=0, threshold=800;
      direction="",prev_direction="";
      for(int i=0; i<64; i++){
        snake_x[i]=0;
        snake_y[i]=0;
      }
      gameState=0;
    }
  }}
  
 
 //matrix.setPoint(head_y, head_x, true);
 //delay(200);
}
void checkDirection(){
  if(analogRead(hpin)>512 && prev_direction!="right")
  direction="left";
  else if(analogRead(hpin)<512 && prev_direction!="left")
  direction="right";
  else if(analogRead(hpin)>512 && prev_direction!="down")
  direction="up";
  else if(analogRead(vpin)<512 && prev_direction!="up")
  direction="down";
  prev_direction=direction;
}
void move_sprite(){
  if(direction=="left")
  head_x++;
  else if(direction=="right")
  head_x--;
  else if(direction=="up")
  head_y--;
  else if(direction=="down")
  head_y++;
  window_check();
  if(button.isPressed()){
    Serial.println("The Button is Pressed");
    flag=1;
  }
}
void window_check(){
  if(head_x>max_x)
  head_x=0;
  else if(head_x<0)
  head_x=max_x;
  else if(head_y>max_y)
  head_y=0;
  else if(head_y<0)
  head_y=max_y;
}
void draw_sprites(){
  matrix.setPoint(food_y, food_x, true);
  for(int i=0; i<=snake_length; i++){
    matrix.setPoint(snake_y[i],snake_x[i], true);
  }
}
void update_snake(){
  for(int i=snake_length; i>=0; i--){
    if(i!=0){
      snake_x[i]=snake_x[i-1];
      snake_y[i]=snake_y[i-1];
    }
    else{
      snake_x[i]=head_x;
      snake_y[i]=head_y;
    }
  }
}
void food_eat_check(){
  if(head_x==food_x && head_y==food_y){
    food_x=random(0,8);
    food_y=random(0,8);
    snake_length++;
    if(snake_length>=15){
      gameState=1;
    }
    threshold=threshold-50;
    if(threshold<100){
      threshold=80;
    }
  }
}
void all_animate(){
  int i =0;
  while(i<3){
    for(int x=0; x<8; x++){
      for(int y=0; y<8; y++){
        matrix.setPoint(y,x,true);
      }
    }
    delay(500);
    matrix.clear();
    delay(500);
    i++;
  }
}
void show_message(char messageToShow[]){
  all_animate();
  int i=0;
  while(messageToShow[i]!="\0"){
    matrix.setChar(6,messageToShow[i]);
    delay(500);
    matrix.clear();
    delay(500);
    i++;
    }
  
}
void snake_collision_check(){
  for(int i=1; i<=snake_length; i++){
    if(snake_x[0]==snake_x[i]&& snake_y[0]==snake_y[i]){
      gameState=2;
    }
  }
}