#define checkWin() Serial.println("MAAK DEZE FUNCTIE")
#define MAX_TIME 100
#define OFF_LIMIT 50

struct button{
 int pin;
 bool status = false;
 int counter = 0;
};
button buttons[4];
char veld[4][4] = {
  0
};

bool beurt = 0;

void onButtonChange(int idx,bool onoff){
  if(onoff&&!veld[idx][0]){
    veld[idx][0]=beurt?2:1;
    beurt=!beurt;

   }

//Serial.println("BUTTON: "+ String(idx) + " turned "+ (onoff?"on":"off"));
}
void updateButtons(){
  for(int i = 0;i<4;i++){
    bool status = !digitalRead(buttons[i].pin);
    //Serial.print(String(status));
    buttons[i].counter += status?1:-1;
    if(buttons[i].counter<0){buttons[i].counter=0;}
    if(buttons[i].counter>MAX_TIME){buttons[i].counter=MAX_TIME;}
    if(buttons[i].counter<OFF_LIMIT){
      if(buttons[i].status){
        buttons[i].status=false;
        onButtonChange(i,false);
      }
    }
    if(buttons[i].counter==MAX_TIME){
      if(!buttons[i].status){
       buttons[i].status=true;
       onButtonChange(i,true);
     }
   }
 }
  //Serial.println();
}

void setup() {
  veld[0][0]=1;
  veld[3][0]=2;
  veld[3][3]=1;
  Serial.begin(9600);
  int pins[] ={9,8,7,6};
  for(int i = 0; i<4;i++){
   buttons[i].pin=pins[i];
   pinMode(pins[i], INPUT_PULLUP);
  }
  bord();
}


long counter = 0;

void loop() {
  counter++;
  updateButtons();
  if(counter%500==0){
    Serial.print("\n\n\n\n\n");
    bord();


  if(!gravity()){
    //checkWin();
  }
  }
}



void bord() {
    for (int i = 0; i < 4; i++) {
      for (int j = 0; j < 4; j++) {
        switch (veld[j][i]) {
          case 0:
            Serial.print('-');
            break;
          case 1:
            Serial.print('X');
            break;
          case 2:
            Serial.print('O');
            break;
        }

      }
      Serial.println();
    }
  }


void checkwin(){
  //if (veld[0][3] = 1
}

bool gravity(){
  bool moved = false;
  for(int x = 0;x<4;x++){
    for(int y = 2;y>=0 /* De onderste rij kan nooit naarbenden, dus hoeven we dat ook niet te checken*/;y--){
      if(veld[x][y]&&!veld[x][y+1]){
        char current = veld[x][y];
        veld[x][y]=0;
        veld[x][y+1]=current;
        moved=true;
      }
    }
  }
  return moved;
}