Build a Tic-Tac-Toe Multiplayer Game in Browser Using HTML5 CSS3 and Javascript Full Project For Beginners

index.html

<html lang="en">
  <head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Tic Tac Toe</title>

    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.5.0/css/font-awesome.min.css"/>
    <link href="https://fonts.googleapis.com/css?family=Amatic+SC|Indie+Flower|Pacifico|Wendy+One" rel="stylesheet">

  </head>
  <body>
    <main class="container">

      <div clss="row">

        <div class="center-block text-center" id="game-body">
          <h1 id="game-title">Tic Tac Toe</h1>

          <div class="center-block text-center" id="start-over-div">
              <button class="btn btn-danger" id="start-over">StartOver</button>
          </div>

          <div id="game-zone">
            <div class="col-xs-4">
              <button class="btn btn-primary normal-button" value="0" id="button1"> </button>
            </div>
            <div class="col-xs-4">
              <button class="btn btn-primary normal-button" value="1">  </button>
            </div>
            <div class="col-xs-4">
              <button class="btn btn-primary normal-button" value="2">  </button>
            </div>

            <div class="col-xs-4">
              <button class="btn btn-primary normal-button" value="3">  </button>
            </div>
            <div class="col-xs-4">
              <button class="btn btn-primary normal-button" value="4">  </button>
            </div>
            <div class="col-xs-4">
              <button class="btn btn-primary normal-button" value="5">  </button>
            </div>

            <div class="col-xs-4">
              <button class="btn btn-primary normal-button" value="6">  </button>
            </div>
            <div class="col-xs-4">
              <button class="btn btn-primary normal-button" value="7">  </button>
            </div>
            <div class="col-xs-4">
              <button class="btn btn-primary normal-button" value="8">  </button>
            </div>

            <div class="center-block text-center" id="game-mode-choose">
                <p id="game-mode-choose-title">Choose Game Mode : </p>
                <button class="btn btn-info" id="one-player">One Player</button>
                <button class="btn btn-info" id="two-players">Two Players</button>
            </div>

            <div class="center-block text-center" id="game-difficulties-choose">
              <p id="game-difficulties-title">Choose Difficulty : </p>
                <button class="btn btn-info difficulty-button" id="easy">Easy</button>
                <button class="btn btn-info difficulty-button" id="medium">Medium</button>
                <button class="btn btn-info difficulty-button" id="hard">Hard</button>
            </div>

            <div class="center-block text-center" id="player-choose">
              <p id="game-player-choose-title">You prefer : </p>
                <button class="btn btn-info player-button" id="cross">X</button>
                <button class="btn btn-info player-button" id="nought">O</button>
            </div>

            <div class="center-block text-center" id="game-over">
              <p id="game-over-title">GAME OVER!</p>
              <p id="game-over-X-win">X Win!</p>
              <p id="game-over-O-win">O Win!</p>
              <p id="game-over-draw">It's a draw!</p>
              <p id="game-over-you-win">You Win!</p>
              <p id="game-over-you-lose">You Lose!</p>
              <div class="center-block">
                <button class="btn btn-info" id="restart">Restart</button>
              </div>
            </div>
          </div>

        </div><!-- end of "game-body" div -->

      </div> <!-- End of "row" div -->

    </main> <!-- End of "container" -->

    <footer class="container">
      <div class="row">
        <div class="col-xs-12 text-center" id="mysocial">
          <a href="https://github.com/AsimoLoveGym" target="_blank"><i class="fa fa-github fa-2x"></i></a>
          <a href="https://www.linkedin.com/in/zhuangzhuang-xia-45304b6b" target="_blank"><i class="fa fa-linkedin-square fa-2x"></i></a>
          <a href="mailto:xiazhuangz@gmail.com" target="_blank"><i class="fa fa-envelope-square fa-2x"></i></a>
        </div>
      </div>
      <div class="text-center">
        <p>For <a href="https://www.freecodecamp.com/challenges/build-a-tic-tac-toe-game" target="_blank">Free Code Camp project</a></p>
        <p> Copyright © <a href="https://www.freecodecamp.com/asimolovegym" target="_blank">Joey Xia</a>. All right reserved. </p>
      </div>
    </footer>

  </body>
</html>

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<head>

</head>

<body>

<button class="btn btn-danger" id="start-over">StartOver</button>

</div>

</div>

</div>

</div>

</div>

</div>

</div>

</div>

</div>

</div>

<p id="game-mode-choose-title">Choose Game Mode : </p>

<button class="btn btn-info" id="one-player">One Player</button>

<button class="btn btn-info" id="two-players">Two Players</button>

</div>

<p id="game-difficulties-title">Choose Difficulty : </p>

<button class="btn btn-info difficulty-button" id="medium">Medium</button>

</div>

<p id="game-player-choose-title">You prefer : </p>

</div>

<button class="btn btn-info" id="restart">Restart</button>

</div>

</div>

</div>

</main>

</div>

<p>For <a href="https://www.freecodecamp.com/challenges/build-a-tic-tac-toe-game" target="_blank">Free Code Camp project</a></p>

</div>

</footer>

</body>

</html>

style.css

html {
  height: 100%;
}

body {
  height: 100%;
}

main {
  margin-top: 5%;
  margin-bottom: 1em;
}

#game-body {

  position: relative;

  width: 100mm;
  height: 120mm;
  background-color: #e1e8f0;
  border: solid 2px #e1e8f0;
  /*padding: 5mm;*/
  border-radius: 5mm;
  margin-bottom: 2em;
  box-shadow: 4px 0 5px gray, 0 4px 5px gray;
}

#game-title {

  margin-top: 1em;
  margin-bottom: 1em;
  /*font-family: 'Baloo Bhai', cursive;*/
  font-family: 'Wendy One', sans-serif;
}

.black-button {
  background-color: #3b3a36;
  border-color: #3b3a36;
  color: white;
}

.normal-button {
  height: 25mm;
  width: 25mm;
  margin-bottom: 5mm;
  font-size: 60px;
}

#game-zone {
  position: relative;
}

#game-over {
  display: none;
  position: absolute;
  /*margin: 0 auto;*/
  top: -9mm;
  left: -0.5mm;
  background: rgba(0, 0, 0, 0.7);
  width: 100mm;
  height: 100mm;

  border-radius: 5mm;

  padding-top: 40mm;
}

#game-mode-choose {
  /*display: none;*/
  position: absolute;
  /*margin: 0 auto;*/
  top: -9mm;
  left: -0.5mm;
  background: rgba(0, 0, 0, 0.7);
  width: 100mm;
  height: 100mm;

  border-radius: 5mm;

  padding-top: 40mm;
}

#game-difficulties-choose {
  display: none;
  position: absolute;
  /*margin: 0 auto;*/
  top: -9mm;
  left: -0.5mm;
  background: rgba(0, 0, 0, 0.7);
  width: 100mm;
  height: 100mm;

  border-radius: 5mm;

  padding-top: 40mm;
}

#player-choose {
  display: none;
  position: absolute;
  /*margin: 0 auto;*/
  top: -9mm;
  left: -0.5mm;
  background: rgba(0, 0, 0, 0.7);
  width: 100mm;
  height: 100mm;

  border-radius: 5mm;

  padding-top: 40mm;
}

#game-over-X-win {
  display: none;
}

#game-over-O-win {
  display: none;
}

#game-over-draw {
  display: none;
}

#game-over-you-win {
  display: none;
}

#game-over-you-lose {
  display: none;
}



#start-over-div {
  /*display: none;*/
  position: absolute;
  /*margin: 0 auto;*/
  top: 0;
  right: 0;
}

#start-over {
  border-radius: 5mm;
  border: solid 2px #e1e8f0;
}



#game-over-title, #game-over-X-win, #game-over-O-win, #game-over-draw, #game-over-you-win, #game-over-you-lose  {
  color: white;
  margin-bottom: 2em;
  font-size: 1.5em;
  /*font-family: 'Pacifico', cursive;*/
  font-family: 'Amatic SC', cursive;
}

#game-mode-choose-title, #game-difficulties-title, #game-player-choose-title {
  color: white;
  font-size: 1.5em;
  /*font-family: 'Indie Flower', cursive;*/
  font-family: 'Pacifico', cursive;
  /*font-family: 'Amatic SC', cursive;*/
}

#cross, #nought {
  font-size: 1.5em;
}

/*#game-mode-choose, #game-difficulties-choose, #player-choose {
  color: white;
  font-size: 1.5em;
  /*font-family: 'Indie Flower', cursive;*/
  font-family: 'Pacifico', cursive;
  /*font-family: 'Amatic SC', cursive;*/
}*/

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html {

height: 100%;

}

body {

height: 100%;

}

main {

margin-top: 5%;

margin-bottom: 1em;

}

#game-body {

position: relative;

width: 100mm;

height: 120mm;

background-color: #e1e8f0;

border: solid 2px #e1e8f0;

/*padding: 5mm;*/

border-radius: 5mm;

margin-bottom: 2em;

box-shadow: 4px 0 5px gray, 0 4px 5px gray;

}

#game-title {

margin-top: 1em;

margin-bottom: 1em;

/*font-family: 'Baloo Bhai', cursive;*/

font-family: 'Wendy One', sans-serif;

}

.black-button {

background-color: #3b3a36;

border-color: #3b3a36;

color: white;

}

.normal-button {

height: 25mm;

width: 25mm;

margin-bottom: 5mm;

font-size: 60px;

}

#game-zone {

position: relative;

}

#game-over {

display: none;

position: absolute;

/*margin: 0 auto;*/

top: -9mm;

left: -0.5mm;

background: rgba(0, 0, 0, 0.7);

width: 100mm;

height: 100mm;

border-radius: 5mm;

padding-top: 40mm;

}

#game-mode-choose {

/*display: none;*/

position: absolute;

/*margin: 0 auto;*/

top: -9mm;

left: -0.5mm;

background: rgba(0, 0, 0, 0.7);

width: 100mm;

height: 100mm;

border-radius: 5mm;

padding-top: 40mm;

}

#game-difficulties-choose {

display: none;

position: absolute;

/*margin: 0 auto;*/

top: -9mm;

left: -0.5mm;

background: rgba(0, 0, 0, 0.7);

width: 100mm;

height: 100mm;

border-radius: 5mm;

padding-top: 40mm;

}

#player-choose {

display: none;

position: absolute;

/*margin: 0 auto;*/

top: -9mm;

left: -0.5mm;

background: rgba(0, 0, 0, 0.7);

width: 100mm;

height: 100mm;

border-radius: 5mm;

padding-top: 40mm;

}

#game-over-X-win {

display: none;

}

#game-over-O-win {

display: none;

}

#game-over-draw {

display: none;

}

#game-over-you-win {

display: none;

}

#game-over-you-lose {

display: none;

}

#start-over-div {

/*display: none;*/

position: absolute;

/*margin: 0 auto;*/

top: 0;

right: 0;

}

#start-over {

border-radius: 5mm;

border: solid 2px #e1e8f0;

}

#game-over-title, #game-over-X-win, #game-over-O-win, #game-over-draw, #game-over-you-win, #game-over-you-lose {

color: white;

margin-bottom: 2em;

font-size: 1.5em;

/*font-family: 'Pacifico', cursive;*/

font-family: 'Amatic SC', cursive;

}

#game-mode-choose-title, #game-difficulties-title, #game-player-choose-title {

color: white;

font-size: 1.5em;

/*font-family: 'Indie Flower', cursive;*/

font-family: 'Pacifico', cursive;

/*font-family: 'Amatic SC', cursive;*/

}

#cross, #nought {

font-size: 1.5em;

}

/*#game-mode-choose, #game-difficulties-choose, #player-choose {

color: white;

font-size: 1.5em;

/*font-family: 'Indie Flower', cursive;*/

font-family: 'Pacifico', cursive;

/*font-family: 'Amatic SC', cursive;*/

}*/

script.js

var activeTurn = "cross";
var buttonClick1 = new Audio("http://soundbible.com/mp3/Blop-Mark_DiAngelo-79054334.mp3");
var youWin = new Audio("http://soundbible.com/mp3/SMALL_CROWD_APPLAUSE-Yannick_Lemieux-1268806408.mp3");
var youLose = new Audio("http://soundbible.com/mp3/Kick-SoundBible.com-1331196005.mp3");
var valiableSpace = [1,1,1,1,1,1,1,1,1];
var crosses = [0,0,0,0,0,0,0,0,0];
var noughts = [0,0,0,0,0,0,0,0,0];

var gameMode = "";
var gameDifficulty = "";
var player = "";

// paired with noMoreValidSpace()
var gameResultIsDraw = false;
// paired with noMoreValidSpace()
// noMoreValidSpace() will reset game only when draw happened.
var gameNotOver = true;

var testingPlayer = "";

// when playingFlag is true, the player can click and place the piece
// Unless, no response will give to click
var playingFlag = false;
var timeOut = 0;

// Here is all the RegExp patterns for winning string
// 8 cases in total
var pattern1 = /^1{3}/;
var pattern2 = /^\d{3}1{3}\d{3}$/;
var pattern3 = /^\d{6}1{3}$/;
var pattern4 = /^1\d{2}1\d{2}1\d{2}$/;
var pattern5 = /^\d1\d{2}1\d{2}1\d$/;
var pattern6 = /^\d{2}1\d{2}1\d{2}1$/;
var pattern7 = /^1\d{3}1\d{3}1$/;
var pattern8 = /^\d{2}1\d1\d1\d{2}$/;

// Testing cases for gameOver()
// for real testing, gameOver() should be placed after declaration.
// var evalString;
//  evalString = "111010100";
// evalString = "000111000";
// evalString = "000000111";
// evalString = "100100100";
// evalString = "010010010";
// evalString = "001001001";
// evalString = "100010001";
// evalString = "001010100";

// gameOver(evalString);


$(document).ready(function(){
  $("#one-player").click(function(){
    gameMode = "one-player";
    // Hide game mode choose screen and show player choose
    $("#game-mode-choose").toggle();
    // $("#game-difficulties-choose").toggle();
    $("#player-choose").toggle();
  });

  $("#two-players").click(function(){
    gameMode = "two-players";
    // Hide mode choose page and start game
    $("#game-mode-choose").toggle();
  });

  // $(".difficulty-button").click(function(event){
  //   // console.log(event.currentTarget.innerHTML);
  //   gameDifficulty = event.currentTarget.innerHTML;
  //   console.log(gameDifficulty);
  //   $("#game-difficulties-choose").toggle();
  //   $("#player-choose").toggle();
  // });

  $(".player-button").click(function(event){
    if(event.currentTarget.innerHTML === "X") {
      player = "cross";
      playingFlag = true;
    } else {
      player = "nought";
      // Computer take the first step
      firstMoveFunc();
    }
    $("#player-choose").toggle();
  });

  $(".normal-button").click(function(event){
    var clickedButton = -1;
    var testString = "";
    clickedButton = event.currentTarget.value;
    // valid clicked Button should not been occupied!
    // Otherwise, ignore the clicking
    // ********** Clickable button control ************
    if (valiableSpace[clickedButton] === 1) {
      // ********** VS Computer game mode ************
      if (gameMode === "one-player" && playingFlag) {
        // player take action first
        if (player === "cross") {
          buttonClick1.play();
          event.currentTarget.innerHTML = "X";
          valiableSpace[clickedButton] = 0;
          crosses[clickedButton] = 1;
          testString = crosses.join("");
          testingPlayer = "player";
          gameOver(testString);
          if (gameNotOver) {
            noMoreValidSpace(valiableSpace);
          }
          playingFlag = false;

          // Computer takes action
          if(gameNotOver) {
            var move = minimax(valiableSpace, noughts, crosses);
            // use setTimeout for a little time break before computer take action
            timeOut = setTimeout(function(){
              buttonClick1.play();
              $("button[value='"+ move +"']").html("O");
              valiableSpace[move] = 0;
              noughts[move] = 1;
              testString = noughts.join("");
              testingPlayer = "computer";
              gameOver(testString);
              if (gameNotOver) {
                noMoreValidSpace(valiableSpace);
              }
              playingFlag = true;
            },1000);
          }
        }

        // computer take action first
        if (player === "nought") {
          // take a random move for the first x
          // The 1st step should be placed after the player choice made, not until the button clicked
          // firstMoveFunc() will take care of the first move.
          // sicne the frist move doesn't need click to invoke, it placed in other place.

          event.currentTarget.innerHTML = "O";
          buttonClick1.play();
          valiableSpace[clickedButton] = 0;
          noughts[clickedButton] = 1;
          testString = noughts.join("");
          testingPlayer = "player";
          gameOver(testString);
          if (gameNotOver) {
            noMoreValidSpace(valiableSpace);
          }
          playingFlag = false;

          // Computer takes action
          if (gameNotOver) {
            var move = minimax(valiableSpace, crosses, noughts);
            timeOut = setTimeout(function(){
              buttonClick1.play();
              $("button[value='"+ move +"']").html("X");
              valiableSpace[move] = 0;
              crosses[move] = 1;
              testString = crosses.join("");
              console.log(testString);
              testingPlayer = "computer";
              gameOver(testString);
              if (gameNotOver) {
                noMoreValidSpace(valiableSpace);
              }
              playingFlag = true;
            },1000);
          }
        }
      }
      // ********** End of VS Computer game mode ************


      // ********** Two players game mode ************
      if (gameMode === "two-players") {
        if (activeTurn === "cross") {
          buttonClick1.play();
          event.currentTarget.innerHTML = "X";
          valiableSpace[clickedButton] = 0;
          crosses[clickedButton] = 1;
          testString = crosses.join("");
          // console.log("crosses string:",testString);
          console.log("In cross: ");
          gameOver(testString);
          if (gameNotOver) {
            noMoreValidSpace(valiableSpace);
          }
        } else {
          buttonClick1.play();
          event.currentTarget.innerHTML = "O";
          valiableSpace[clickedButton] = 0;
          noughts[clickedButton] = 1;
          testString = noughts.join("");
          gameOver(testString);
          if (gameNotOver) {
            noMoreValidSpace(valiableSpace);
          }
        }
        // Switch active Turn after each step
        if (activeTurn === "cross") {
          activeTurn = "nought";
        } else {
          activeTurn = "cross";
        }
      }
      // ********** End of Two players game mode ************
    }
    // ********** End of clickable button control ************
  });

  $("#start-over").click(function(event){
    // in case of any code in setTimeout() time flow.
    // it may change the initial game view
    clearTimeout(timeOut);
    // reset all the necessary properties before reset() call
    // in reset(), the firstMoveFunc() will be called.
    gameMode = "";
    gameDifficulty = "";
    player = "";

    reset();
    // reset all the display.
    $("#game-mode-choose").show();
    $("#game-over").hide();
    // $("#game-difficulties-choose").hide();
    $("#player-choose").hide();
  });

  $("#restart").click(function(event){
    reset();
  });

});

var winPattern = function(evalString) {
  if (pattern1.test(evalString) || pattern2.test(evalString) ||pattern3.test(evalString) ||pattern4.test(evalString) ||pattern5.test(evalString) ||pattern6.test(evalString) ||pattern7.test(evalString) ||pattern8.test(evalString) ) {
    return true;
  } else {
    return false;
  }
}

var gameOver = function(evalString) {
  if (winPattern(evalString)) {
    // gameNotOver flag switched, any further click would not result in any response
    gameNotOver = false;
    // for debugging
    // console.log(activeTurn);
    timeOut = setTimeout(function(){
      // for debugging
      // console.log(activeTurn);
      $("#game-over").show();
      // Since setTimeout is a good one for better game experience
      // activeTurn switch would be immediately happened after gameOver()
      // The activeTurn would always be "nought" when winning happened in "Cross"
      // Vice versa

      // if X wins
      if (activeTurn === "nought" && gameMode === "two-players") {
        $("#game-over-X-win").show();
        youWin.play();
      }
      // if O wins
      if (activeTurn === "cross" && gameMode === "two-players") {
        $("#game-over-O-win").show();
        youWin.play();
      }
      if (testingPlayer === "player" && gameMode === "one-player") {
        $("#game-over-you-win").show();
        youWin.play();
      }
      if (testingPlayer === "computer" && gameMode === "one-player") {
        $("#game-over-you-lose").show();
        youLose.play();
      }
    }, 500);
  }
};// *************** End of gameOver() *******************8

var noMoreValidSpace = function(validSpaceArr) {
  if (validSpaceArr.indexOf(1) === -1) {
    gameNotOver = false;
    gameResultIsDraw = true;
    timeOut = setTimeout(function(){
      $("#game-over").show();
      $("#game-over-draw").show();
    }, 500);
  }
}

var reset = function () {
  activeTurn = "cross";
  valiableSpace= [1,1,1,1,1,1,1,1,1];
  crosses= [0,0,0,0,0,0,0,0,0];
  noughts= [0,0,0,0,0,0,0,0,0];
  if (player === "nought") {
    firstMoveFunc();
  }
  // reset all the button content to be null
  $(".normal-button").each(function(index,item){
    item.innerHTML = "";
  });
  // $("#game-over").toggle();
  $("#game-over").hide();
  $("#game-over-X-win").hide();
  $("#game-over-O-win").hide();
  $("#game-over-draw").hide();
  $("#game-over-you-win").hide();
  $("#game-over-you-lose").hide();

  gameResultIsDraw = false;
  gameNotOver = true;
  testingPlayer = "";
  playingFlag = false;
}

// if computer take the first move, it will be a random move
var firstMoveFunc = function(){
  var firstMove = Math.floor(Math.random()*9);
  setTimeout(function () {
    buttonClick1.play();
    $("button[value='"+ firstMove +"']").html("X");
    valiableSpace[firstMove] = 0;
    crosses[firstMove] = 1;
    playingFlag = true;
  }, 1000);
}

// ***************** minimax(), not real minimax algorithm *******************8
var minimax = function(validSpace, playerArray, oppArray) {
  var validIndex = [];
  // extract the index of valid space for next move
  for(var i = 0; i < validSpace.length; i ++) {
    if(validSpace[i] === 1){
      validIndex.push(i);
    }
  }

  // Case d: 1 in a line with 2 valid space
  var evalValidString = validSpace.join("");
  // console.log(evalValidString);
  var pointInSpace0 = 0;
  var pointInSpace1 = 0;
  var pointInSpace2 = 0;
  var pointInSpace3 = 0;
  var pointInSpace4 = 0;
  var pointInSpace5 = 0;
  var pointInSpace6 = 0;
  var pointInSpace7 = 0;
  var pointInSpace8 = 0;

  if (winPattern(evalValidString)) {
    // how to get the winPattern's matching index?
    // validSpace[validIndex]

    if (pattern1.test(evalValidString) ) {
      // console.log("IN Pattern 1");
      // index 0 1 and 2 is the index of pattern1
        pointInSpace0 ++;
        pointInSpace1 ++;
        pointInSpace2 ++;
    }
    if (pattern2.test(evalValidString) ) {
      // console.log("IN Pattern 2");
        pointInSpace3 ++;
        pointInSpace4 ++;
        pointInSpace5 ++;
    }
    if (pattern3.test(evalValidString) ) {
      // console.log("IN Pattern 3");
        pointInSpace6 ++;
        pointInSpace7 ++;
        pointInSpace8 ++;
    }
    if (pattern4.test(evalValidString) ) {
      // console.log("IN Pattern 4");
        pointInSpace0 ++;
        pointInSpace3 ++;
        pointInSpace6 ++;
    }
    if (pattern5.test(evalValidString) ) {
      // console.log("IN Pattern 5");
        pointInSpace1 ++;
        pointInSpace4 ++;
        pointInSpace7 ++;
    }
    if (pattern6.test(evalValidString) ) {
      // console.log("IN Pattern 6");
        pointInSpace2 ++;
        pointInSpace5 ++;
        pointInSpace8 ++;
    }
    if (pattern7.test(evalValidString) ) {
      // console.log("IN Pattern 7");
        pointInSpace0 ++;
        pointInSpace4 ++;
        pointInSpace8 ++;
    }
    if (pattern8.test(evalValidString) ) {
      // console.log("IN Pattern 8");
        pointInSpace2 ++;
        pointInSpace4 ++;
        pointInSpace6 ++;
    }
  }
//*************************** End of case d ***************************

  var scores = [];
  // console.log(validIndex);
  var move = 0;
  var maxScore = 0;
  for(var i = 0; i < validIndex.length; i ++) {
    // possible move + playerArray = playerArray_test.
    var score = 0;
    var playerArray_test = playerArray.slice();
    playerArray_test[validIndex[i]] = 1;
    var oppArray_test = oppArray.slice();
    oppArray_test[validIndex[i]] = 1;
    // console.log(i,playerArray_test);
    // console.log(oppArray_test);
    // console.log(playerArray);

    // Case a: immediately winning
    if (winPattern(playerArray_test.join(""))) {
      // console.log("IN Case a");
      score += 1000;
    }
    // Case b: block oppnent immediately winning
    if (winPattern(oppArray_test.join(""))) {
      // console.log("IN Case b");
      score += 100;
    }

    // In game logic, case c and d need to be analysis when case b and case a didn't happened
    // Case a and case b are far more important.
    if(score < 1000) {
      // Case c: 2 in a line with a valid space
      for(var j = 0; j < validIndex.length; j ++) {
        if(validIndex[j] !== validIndex[i]) {
          var playerArray_test2 = playerArray_test.slice();
          playerArray_test2[validIndex[j]] = 1;
          // console.log(playerArray_test2.join(""));
          if(winPattern(playerArray_test2.join(""))) {
            // console.log(playerArray_test2.join(""));
            // console.log("IN Case c");
            score += 10;
            // break;
          }
        }
      }

      // Case d: 1 in a line with 2 valid space

      switch (validIndex[i]) {
        case 0:
          score += pointInSpace0;
          break;
        case 1:
          score += pointInSpace1;
          break;
        case 2:
          score += pointInSpace2;
          break;
        case 3:
          score += pointInSpace3;
          break;
        case 4:
          score += pointInSpace4;
          break;
        case 5:
          score += pointInSpace5;
          break;
        case 6:
          score += pointInSpace6;
          break;
        case 7:
          score += pointInSpace7;
          break;
        case 8:
          score += pointInSpace8;
          break;
      }
    }

    if (score > maxScore) {
      maxScore = score;
      move = validIndex[i];
    }
    if (maxScore === 0) {
      move = validIndex[i];
    }
    // console.log(score);
    scores.push(score);
  } // end of for loop
  // console.log(maxScore, move);
  return move;
}; // end of minimax function


// Test Case 1: works, more on the case d analysis
// minimax([1,0,1,0,1,0,1,0,1],[0,1,0,1,0,0,0,0,0],[0,0,0,0,0,1,0,1,0]);
// Test Case 2: works, more on the blocking and winning score. Case c not that precesis, but works
// Case a and case b works fine.
// minimax([1,0,0,0,1,1,0,1,1],[0,1,1,0,0,0,0,0,0],[0,0,0,1,0,0,1,0,0]);

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var activeTurn = "cross";

var buttonClick1 = new Audio("http://soundbible.com/mp3/Blop-Mark_DiAngelo-79054334.mp3");

var youWin = new Audio("http://soundbible.com/mp3/SMALL_CROWD_APPLAUSE-Yannick_Lemieux-1268806408.mp3");

var youLose = new Audio("http://soundbible.com/mp3/Kick-SoundBible.com-1331196005.mp3");

var valiableSpace = [1,1,1,1,1,1,1,1,1];

var crosses = [0,0,0,0,0,0,0,0,0];

var noughts = [0,0,0,0,0,0,0,0,0];

var gameMode = "";

var gameDifficulty = "";

var player = "";

// paired with noMoreValidSpace()

var gameResultIsDraw = false;

// paired with noMoreValidSpace()

// noMoreValidSpace() will reset game only when draw happened.

var gameNotOver = true;

var testingPlayer = "";

// when playingFlag is true, the player can click and place the piece

// Unless, no response will give to click

var playingFlag = false;

var timeOut = 0;

// Here is all the RegExp patterns for winning string

// 8 cases in total

var pattern1 = /^1{3}/;

var pattern2 = /^\d{3}1{3}\d{3}$/;

var pattern3 = /^\d{6}1{3}$/;

var pattern4 = /^1\d{2}1\d{2}1\d{2}$/;

var pattern5 = /^\d1\d{2}1\d{2}1\d$/;

var pattern6 = /^\d{2}1\d{2}1\d{2}1$/;

var pattern7 = /^1\d{3}1\d{3}1$/;

var pattern8 = /^\d{2}1\d1\d1\d{2}$/;

// Testing cases for gameOver()

// for real testing, gameOver() should be placed after declaration.

// var evalString;

// evalString = "111010100";

// evalString = "000111000";

// evalString = "000000111";

// evalString = "100100100";

// evalString = "010010010";

// evalString = "001001001";

// evalString = "100010001";

// evalString = "001010100";

// gameOver(evalString);

$(document).ready(function(){

$("#one-player").click(function(){

gameMode = "one-player";

// Hide game mode choose screen and show player choose

$("#game-mode-choose").toggle();

// $("#game-difficulties-choose").toggle();

$("#player-choose").toggle();

});

$("#two-players").click(function(){

gameMode = "two-players";

// Hide mode choose page and start game

$("#game-mode-choose").toggle();

});

// $(".difficulty-button").click(function(event){

// // console.log(event.currentTarget.innerHTML);

// gameDifficulty = event.currentTarget.innerHTML;

// console.log(gameDifficulty);

// $("#game-difficulties-choose").toggle();

// $("#player-choose").toggle();

// });

$(".player-button").click(function(event){

if(event.currentTarget.innerHTML === "X") {

player = "cross";

playingFlag = true;

} else {

player = "nought";

// Computer take the first step

firstMoveFunc();

}

$("#player-choose").toggle();

});

$(".normal-button").click(function(event){

var clickedButton = -1;

var testString = "";

clickedButton = event.currentTarget.value;

// valid clicked Button should not been occupied!

// Otherwise, ignore the clicking

// ********** Clickable button control ************

if (valiableSpace[clickedButton] === 1) {

// ********** VS Computer game mode ************

if (gameMode === "one-player" && playingFlag) {

// player take action first

if (player === "cross") {

buttonClick1.play();

event.currentTarget.innerHTML = "X";

valiableSpace[clickedButton] = 0;

crosses[clickedButton] = 1;

testString = crosses.join("");

testingPlayer = "player";

gameOver(testString);

if (gameNotOver) {

noMoreValidSpace(valiableSpace);

}

playingFlag = false;

// Computer takes action

if(gameNotOver) {

var move = minimax(valiableSpace, noughts, crosses);

// use setTimeout for a little time break before computer take action

timeOut = setTimeout(function(){

buttonClick1.play();

$("button[value='"+ move +"']").html("O");

valiableSpace[move] = 0;

noughts[move] = 1;

testString = noughts.join("");

testingPlayer = "computer";

gameOver(testString);

if (gameNotOver) {

noMoreValidSpace(valiableSpace);

}

playingFlag = true;

},1000);

}

// computer take action first

if (player === "nought") {

// take a random move for the first x

// The 1st step should be placed after the player choice made, not until the button clicked

// firstMoveFunc() will take care of the first move.

// sicne the frist move doesn't need click to invoke, it placed in other place.

event.currentTarget.innerHTML = "O";

buttonClick1.play();

valiableSpace[clickedButton] = 0;

noughts[clickedButton] = 1;

testString = noughts.join("");

testingPlayer = "player";

gameOver(testString);

if (gameNotOver) {

noMoreValidSpace(valiableSpace);

}

playingFlag = false;

// Computer takes action

if (gameNotOver) {

var move = minimax(valiableSpace, crosses, noughts);

timeOut = setTimeout(function(){

buttonClick1.play();

$("button[value='"+ move +"']").html("X");

valiableSpace[move] = 0;

crosses[move] = 1;

testString = crosses.join("");

console.log(testString);

testingPlayer = "computer";

gameOver(testString);

if (gameNotOver) {

noMoreValidSpace(valiableSpace);

}

playingFlag = true;

},1000);

}

// ********** End of VS Computer game mode ************

// ********** Two players game mode ************

if (gameMode === "two-players") {

if (activeTurn === "cross") {

buttonClick1.play();

event.currentTarget.innerHTML = "X";

valiableSpace[clickedButton] = 0;

crosses[clickedButton] = 1;

testString = crosses.join("");

// console.log("crosses string:",testString);

console.log("In cross: ");

gameOver(testString);

if (gameNotOver) {

noMoreValidSpace(valiableSpace);

}

} else {

buttonClick1.play();

event.currentTarget.innerHTML = "O";

valiableSpace[clickedButton] = 0;

noughts[clickedButton] = 1;

testString = noughts.join("");

gameOver(testString);

if (gameNotOver) {

noMoreValidSpace(valiableSpace);

}

// Switch active Turn after each step

if (activeTurn === "cross") {

activeTurn = "nought";

} else {

activeTurn = "cross";

}

// ********** End of Two players game mode ************

}

// ********** End of clickable button control ************

});

$("#start-over").click(function(event){

// in case of any code in setTimeout() time flow.

// it may change the initial game view

clearTimeout(timeOut);

// reset all the necessary properties before reset() call

// in reset(), the firstMoveFunc() will be called.

gameMode = "";

gameDifficulty = "";

player = "";

reset();

// reset all the display.

$("#game-mode-choose").show();

$("#game-over").hide();

// $("#game-difficulties-choose").hide();

$("#player-choose").hide();

});

$("#restart").click(function(event){

reset();

});

var winPattern = function(evalString) {

if (pattern1.test(evalString) || pattern2.test(evalString) ||pattern3.test(evalString) ||pattern4.test(evalString) ||pattern5.test(evalString) ||pattern6.test(evalString) ||pattern7.test(evalString) ||pattern8.test(evalString) ) {

return true;

} else {

return false;

}

var gameOver = function(evalString) {

if (winPattern(evalString)) {

// gameNotOver flag switched, any further click would not result in any response

gameNotOver = false;

// for debugging

// console.log(activeTurn);

timeOut = setTimeout(function(){

// for debugging

// console.log(activeTurn);

$("#game-over").show();

// Since setTimeout is a good one for better game experience

// activeTurn switch would be immediately happened after gameOver()

// The activeTurn would always be "nought" when winning happened in "Cross"

// Vice versa

// if X wins

if (activeTurn === "nought" && gameMode === "two-players") {

$("#game-over-X-win").show();

youWin.play();

}

// if O wins

if (activeTurn === "cross" && gameMode === "two-players") {

$("#game-over-O-win").show();

youWin.play();

}

if (testingPlayer === "player" && gameMode === "one-player") {

$("#game-over-you-win").show();

youWin.play();

}

if (testingPlayer === "computer" && gameMode === "one-player") {

$("#game-over-you-lose").show();

youLose.play();

}

}, 500);

}

};// *************** End of gameOver() *******************8

var noMoreValidSpace = function(validSpaceArr) {

if (validSpaceArr.indexOf(1) === -1) {

gameNotOver = false;

gameResultIsDraw = true;

timeOut = setTimeout(function(){

$("#game-over").show();

$("#game-over-draw").show();

}, 500);

}

var reset = function () {

activeTurn = "cross";

valiableSpace= [1,1,1,1,1,1,1,1,1];

crosses= [0,0,0,0,0,0,0,0,0];

noughts= [0,0,0,0,0,0,0,0,0];

if (player === "nought") {

firstMoveFunc();

}

// reset all the button content to be null

$(".normal-button").each(function(index,item){

item.innerHTML = "";

});

// $("#game-over").toggle();

$("#game-over").hide();

$("#game-over-X-win").hide();

$("#game-over-O-win").hide();

$("#game-over-draw").hide();

$("#game-over-you-win").hide();

$("#game-over-you-lose").hide();

gameResultIsDraw = false;

gameNotOver = true;

testingPlayer = "";

playingFlag = false;

}

// if computer take the first move, it will be a random move

var firstMoveFunc = function(){

var firstMove = Math.floor(Math.random()*9);

setTimeout(function () {

buttonClick1.play();

$("button[value='"+ firstMove +"']").html("X");

valiableSpace[firstMove] = 0;

crosses[firstMove] = 1;

playingFlag = true;

}, 1000);

}

// ***************** minimax(), not real minimax algorithm *******************8

var minimax = function(validSpace, playerArray, oppArray) {

var validIndex = [];

// extract the index of valid space for next move

for(var i = 0; i < validSpace.length; i ++) {

if(validSpace[i] === 1){

validIndex.push(i);

}

// Case d: 1 in a line with 2 valid space

var evalValidString = validSpace.join("");

// console.log(evalValidString);

var pointInSpace0 = 0;

var pointInSpace1 = 0;

var pointInSpace2 = 0;

var pointInSpace3 = 0;

var pointInSpace4 = 0;

var pointInSpace5 = 0;

var pointInSpace6 = 0;

var pointInSpace7 = 0;

var pointInSpace8 = 0;

if (winPattern(evalValidString)) {

// how to get the winPattern's matching index?

// validSpace[validIndex]

if (pattern1.test(evalValidString) ) {

// console.log("IN Pattern 1");

// index 0 1 and 2 is the index of pattern1

pointInSpace0 ++;

pointInSpace1 ++;

pointInSpace2 ++;

}

if (pattern2.test(evalValidString) ) {

// console.log("IN Pattern 2");

pointInSpace3 ++;

pointInSpace4 ++;

pointInSpace5 ++;

}

if (pattern3.test(evalValidString) ) {

// console.log("IN Pattern 3");

pointInSpace6 ++;

pointInSpace7 ++;

pointInSpace8 ++;

}

if (pattern4.test(evalValidString) ) {

// console.log("IN Pattern 4");

pointInSpace0 ++;

pointInSpace3 ++;

pointInSpace6 ++;

}

if (pattern5.test(evalValidString) ) {

// console.log("IN Pattern 5");

pointInSpace1 ++;

pointInSpace4 ++;

pointInSpace7 ++;

}

if (pattern6.test(evalValidString) ) {

// console.log("IN Pattern 6");

pointInSpace2 ++;

pointInSpace5 ++;

pointInSpace8 ++;

}

if (pattern7.test(evalValidString) ) {

// console.log("IN Pattern 7");

pointInSpace0 ++;

pointInSpace4 ++;

pointInSpace8 ++;

}

if (pattern8.test(evalValidString) ) {

// console.log("IN Pattern 8");

pointInSpace2 ++;

pointInSpace4 ++;

pointInSpace6 ++;

}

//*************************** End of case d ***************************

var scores = [];

// console.log(validIndex);

var move = 0;

var maxScore = 0;

for(var i = 0; i < validIndex.length; i ++) {

// possible move + playerArray = playerArray_test.

var score = 0;

var playerArray_test = playerArray.slice();

playerArray_test[validIndex[i]] = 1;

var oppArray_test = oppArray.slice();

oppArray_test[validIndex[i]] = 1;

// console.log(i,playerArray_test);

// console.log(oppArray_test);

// console.log(playerArray);

// Case a: immediately winning

if (winPattern(playerArray_test.join(""))) {

// console.log("IN Case a");

score += 1000;

}

// Case b: block oppnent immediately winning

if (winPattern(oppArray_test.join(""))) {

// console.log("IN Case b");

score += 100;

}

// In game logic, case c and d need to be analysis when case b and case a didn't happened

// Case a and case b are far more important.

if(score < 1000) {

// Case c: 2 in a line with a valid space

for(var j = 0; j < validIndex.length; j ++) {

if(validIndex[j] !== validIndex[i]) {

var playerArray_test2 = playerArray_test.slice();

playerArray_test2[validIndex[j]] = 1;

// console.log(playerArray_test2.join(""));

if(winPattern(playerArray_test2.join(""))) {

// console.log(playerArray_test2.join(""));

// console.log("IN Case c");

score += 10;

// break;

}

// Case d: 1 in a line with 2 valid space

switch (validIndex[i]) {

case 0:

score += pointInSpace0;

break;

case 1:

score += pointInSpace1;

break;

case 2:

score += pointInSpace2;

break;

case 3:

score += pointInSpace3;

break;

case 4:

score += pointInSpace4;

break;

case 5:

score += pointInSpace5;

break;

case 6:

score += pointInSpace6;

break;

case 7:

score += pointInSpace7;

break;

case 8:

score += pointInSpace8;

break;

}

if (score > maxScore) {

maxScore = score;

move = validIndex[i];

}

if (maxScore === 0) {

move = validIndex[i];

}

// console.log(score);

scores.push(score);

} // end of for loop

// console.log(maxScore, move);

return move;

}; // end of minimax function

// Test Case 1: works, more on the case d analysis

// minimax([1,0,1,0,1,0,1,0,1],[0,1,0,1,0,0,0,0,0],[0,0,0,0,0,1,0,1,0]);

// Test Case 2: works, more on the blocking and winning score. Case c not that precesis, but works

// Case a and case b works fine.

// minimax([1,0,0,0,1,1,0,1,1],[0,1,1,0,0,0,0,0,0],[0,0,0,1,0,0,1,0,0]);

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