var cards = [];
var startTime;
var timer;
<<<<<<< HEAD
//var infobox =docment.getElementById("start")
=======
//var infobox =docment.getElementById("start");
>>>>>>> a018a7ef19aa87692bfc545fb67d4e7a570e3300
var backTimer;
var flgFirst = true;
var cardFirst;
var countUnit = 0;

window.onload = function(){
    var arr = [];
    
    for (var i = 0; i < 10; i++){
       
        arr.push(i);
        arr.push(i);
    }
    
   
    shuffle(arr);
    
    var panel = document.getElementById('panel');
    
  
    for (i = 0; i < 20; i++){
        var div = document.createElement('div');
        div.className = 'card back';
        div.index = i;
        div.number = arr[i];
        div.innerHTML = '';
        div.onclick = turn;
        panel.appendChild(div);
        cards.push(div);
    }
    startTime = new Date();
    startTimer();
    
}
function shuffle(arr) {
    var n = arr.length;
    var temp, i;

    while (n) {
        i = Math.floor(Math.random() * n--);
        temp = arr[n];
        arr[n] = arr[i];
        arr[i] = temp;
    }
    return arr;
}
function turn(e){
    
    var div = e.target;
    
    if (backTimer) return;

    if (div.innerHTML == ''){
        div.className = 'card';
        div.innerHTML = div.number; 
    }else{
        return;
    }
    
    if (flgFirst){
        cardFirst = div;
        flgFirst = false;
        
    }else{
        
        if (cardFirst.number == div.number){
            countUnit++;
            backTimer = setTimeout(function(){
                div.className = 'card finish';
                cardFirst.className = 'card finish';
                backTimer = NaN;
                
                if (countUnit == 10){
                    clearInterval(timer);  
                }
            }, 500)
        }else{  
            backTimer = setTimeout(function(){
                div.className = 'card back';
                div.innerHTML = '';
                cardFirst.className = 'card back';
                cardFirst.innerHTML = '';
                cardFirst = null;
                backTimer = NaN;
            }, 500);
        }
        
        flgFirst = true;
    }  
}

function startTimer(){
    //infobox.removeEventListener("click",startTimer, fales);
    timer = setInterval(showSecond, 1000);
}

function showSecond(){

    var nowTime = new Date();
    var elapsedTime = Math.floor((nowTime - startTime) / 1000);
    var str = '経過秒数: ' + elapsedTime + '秒経過';

    var re = document.getElementById('result');
    re.innerHTML = str;
}