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              <main>
    <header style="text-align: center;">
        <h1>Memory Games</h1>
    </header>

    <nav style="display: flex; flex-direction: row">
        <h2>Select a difficulty:</h2>
        <ul>
            <li>
                <button id="start-easy">Easy</button>
            </li>
            <li>
                <button id="start-medium">Medium</button>
            </li>
            <li>
                <button id="start-hard">Hard</button>
            </li>
        </ul>
    </nav>

    <section id="stage">

    </section>
</main>

<template id="card-template">
    <article class="card">
        <h2 data-value></h2>
    </article>
</template>

            
          
!
            
              #stage {
            display: flex;
        }

        .card {
            margin: 1rem;
            width: 10rem;
            height: 10rem;
        }

.card.selected {
            border: blue 2px solid;
            color: blue;
        }
            
          
!
            
              document.addEventListener('DOMContentLoaded', matchingGame);
        function matchingGame(){

            var startEasy = document.getElementById('start-easy');
            var startMedium = document.getElementById('start-medium');
            var startHard = document.getElementById('start-hard');

            var stage = document.getElementById('stage');

            var cardTemplate = document.getElementById('card-template');

            var totalCards;
            var renderedCards;

            var selectedCard;

            init();
            function init(){
                startEasy.addEventListener('click', initEasy);
                // startMedium.addEventListener('click', initMedium);
                // startHard.addEventListener('click', initHard);
                initEasy();
            }

            function initEasy(){
                totalCards = 4;// TODO random!
                renderedCards = 0;

                renderCards();
                bindCards();
                resetSelections();
            }

            function renderCards(){
                var documentFragments = document.createDocumentFragment();
                var cards = [];
                while(renderedCards < totalCards){
                    var number = getRandomInt(1, 100);
                    // Make two cards
                    var card = renderCard(number);
                    cards.push(card);
                    card = renderCard(number);
                    cards.push(card);
                    renderedCards += 2;
                }

                cards = shuffle(cards);
                cards.forEach(function(card){
                    documentFragments.appendChild(card);
                });

                stage.innerHTML = '';
                stage.appendChild(documentFragments);

                // TODO bind to the cards and listen for click. Leave the first card 'selected', when the second card is selected, test if htey match and remove them from the sets.
            }

            /**
             * @param {int} number
             * @return Node
             */
            function renderCard(number){
                var clone = document.importNode(cardTemplate.content, true);
                var element = clone.querySelector('[data-value]');
                element.dataset.value = number;
                element.innerHTML = number;
                return clone;
            }

            function bindCards(){
                Array.from(stage.querySelectorAll('.card')).forEach(function(card){
                    card.addEventListener('click', handleCardClick);
                })
            }

            /**
             * Resets if the game is beaten or not
             */
            function resetSelections(){
                selectedCard = undefined;
                Array.from(stage.querySelectorAll('.card.selected')).forEach(function(card){
                    card.classList.remove('selected');
                });
            }

            /**
             * @param {Event} event
             */
            function handleCardClick(event){
               if(!selectedCard){
                   console.log('First selection: ', event.currentTarget);
                   selectedCard = event.currentTarget;
                   selectedCard.classList.add('selected');
                   return;
               }


               console.log('second selection', selectedCard, event.currentTarget);

               // TODO was this first or second selection?
                // TODO how do you 'show' the user?
            }

            /**
             * Reorders an array
             * @param array
             * @returns {*}
             */
            function shuffle(array) {
                var currentIndex = array.length, temporaryValue, randomIndex;

                // While there remain elements to shuffle...
                while (0 !== currentIndex) {

                    // Pick a remaining element...
                    randomIndex = Math.floor(Math.random() * currentIndex);
                    currentIndex -= 1;

                    // And swap it with the current element.
                    temporaryValue = array[currentIndex];
                    array[currentIndex] = array[randomIndex];
                    array[randomIndex] = temporaryValue;
                }

                return array;
            }

            /**
             * Returns a random integer between min (inclusive) and max (inclusive)
             * Using Math.round() will give you a non-uniform distribution!
             */
            function getRandomInt(min, max) {
                return Math.floor(Math.random() * (max - min + 1)) + min;
            }

        }
            
          
!
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