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              <link href="https://fonts.googleapis.com/css?family=Roboto" rel="stylesheet">


<div id="background" class="b1">
  
  <div class="loginForm">
    <h2> X or O?</h2>
    <div class="labelHolder">
      <label class="switch">
      <input id="input"  type="checkbox">
      <div class="slider round"> </div>
    </label>
      <div id = "label1" class="toggleLabel label1 ">x</div>
      <div id = "label2" class="toggleLabel label2 ">o</div>
    <div class="clear"></div>
    </div>
    
    
    
  </div>  
  
  





<div class="board">  
  <div class="square top left" id="1"></div>
  <div class="square top" id="2"></div>
  <div class="square top right" id="3"></div>
  <div class="square left" id="4"></div>
  <div class="square" id="5"></div>
  <div class="square right" id="6"></div>
  <div class="square bottom left" id="7"></div>
  <div class="square bottom" id="8"></div>
  <div class="square bottom right" id="9"></div>
</div>  
  
  
</div>  
            
          
!
            
              

body {
  font-family: 'Roboto', sans-serif;
/*  background-color: #00bbd3;*/
  color: rgba(0,0,0,0.87);
  padding: 0;
  margin: 0;
}
h2 {
  font-family: 'Roboto', sans-serif;
}
.board {
  margin: 0 auto;
  width: -webkit-fit-content;
  width: -moz-fit-content;
  width: 286px;
  height: 286px;
  background-color: rgb(250,250,250);
  padding: 40px;
  border-radius: 5px;
  box-shadow: 5px 5px 5px rgba(0,0,0,0.2);
}
.square {
  width: 90px;
  height: 90px;
  border: 4px solid #00bbd3;
  float: left;
  cursor: pointer;
  color: #5c6bc0;
}
.square:nth-child(3n+1){
  clear:both;
}
.top {
  border-top: none;
}
.bottom {
  border-bottom: none;
}
.left {
  border-left: none;
}
.right {
  border-right: none;
}

.player1,
.player2,
.computer{
  font-size: 55px;
  text-align: center;
  vertical-align: text-top;
  cursor: default;
}


            
          
!
            
              //chane symbol by having switches that toggle currentPlayer.symbol and game.mode 

Set.prototype.isSuperset = function(subset) {
    for (var elem of subset) {
        if (!this.has(elem)) {
            return false;
        }
    }
    return true;
}

let waysToWin = [[1,2,3],[4,5,6],[7,8,9],[1,4,7],[2,5,8],[3,6,9],[1,5,9],[3,5,7]];


function Game() {
  function toggleXO(){
      var input = document.getElementById("input");
      if (input.checked){
        player1.symbol = "o";
        player2.symbol = "x";
        }
      else{
        player1.symbol = "x";
        player2.symbol = "o";
      }
  }
  this.initialize = function () {
      mode = "single";
      player1 = new User("player1","x");
      //make computer subclass of player
      if (mode=="single"){
          player2 = new User("computer","o")}
      if (mode=="double"){
          player2 = new User("player2","o");
        };
      toggleXO();
      state = {player1:[], player2:[], remaining:[1,2,3,4,5,6,7,8,9]}
      turnCount = 1;
      currentPlayer = player1;
//      state = {};
      addEventListenersToBoard();
  }
   document.getElementById("input").addEventListener("click", toggleXO);
    
  allSquares = document.getElementsByClassName('square');
  addEventListenersToBoard = function (){for (var i=0; i<allSquares.length; i++) {
    allSquares[i].addEventListener('click', playTurn, false);
    }}
  
  this.switchPlayer = function () {
    if (currentPlayer == player1) {
      currentPlayer = player2;
    }
    else {
      currentPlayer = player1;
    }
  }
  let dplay = function(id){
    thisSquare = document.getElementById(id);
    currentPlayer.addSquare(id);
    index=state.remaining.indexOf(parseInt(id));
    state.remaining.splice(index,1);
    thisSquare.removeEventListener("click", playTurn, false);
    turnCount++;
    thisSquare.className += ' '+ currentPlayer.name;
    thisSquare.innerText = currentPlayer.symbol;
    if (turnCount > 5 ){
      let w = currentPlayer.checkWins();
      if (w==true) {
        alert(currentPlayer.symbol+" wins!!!")
        game.initialize();
        game.clearXAndO();
      }
      else if (turnCount == 10) {
        game.initialize();
        game.clearXAndO();
      } 
      else {  
        game.switchPlayer();
        if (mode == "single"&& currentPlayer.name != "player1"){
          game.computerPlay();
      } 
      }
    }
    else {
      game.switchPlayer();
      if (mode == "single"&& currentPlayer.name != "player1"){
        game.computerPlay();
      }  
    }
  }
  
  this.computerPlay = function () {
    max = state.remaining.length;
    randomIndex=Math.floor(Math.random()*(max));
    randomSquare = state.remaining[randomIndex];
    randomSquareId = randomSquare;
    dplay(randomSquareId);
  }
  this.clearXAndO = function () {for (var i=0; i<allSquares.length; i++){
    allSquares[i].classList.remove(player1.name);
    allSquares[i].classList.remove(player2.name);
    allSquares[i].innerText = "";
  }}
  let playTurn = function () {
    id = this.id;
    dplay(id);
  }
  this.initialize();                              
}

function User(name,symbol){
  this.symbol = symbol;
  this.name = name;
//  this.color = color;
  this.squares = [];
  this.addSquare = function(squareId){
    this.squares.push(parseInt(squareId));
  }
  this.checkWins = function(){
    let setA = new Set (this.squares);
    let winFound = waysToWin.filter(function(win){
      let setB = new Set(win);
      return setA.isSuperset(setB);
    })
    if (winFound.length>0){
      return true;
    }
  } 
}

let game = new Game;


            
          
!
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