const cards_value = ['as',2,3,4,5,6,7,8,9,10,'walet','dama','krol'];
    const cards_color = ['trefl','karo', 'serce','pik'];


    var card = 0;
    var i =0;

    function cardObjectConstructor(cards_color,cards_value){

        this.color = cards_color;
        this.value = cards_value;
    }

    function shuffleArray(deck) {

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

            var j = Math.floor(Math.random() * deck.length);
            var temp = deck[i];
            deck[i] = deck[j];
            deck[j] = temp;
        }


    return deck;

    }

    function createCardObject(cards_color,cards_value){
        var n = 0;
        var cards_objects_array = [];

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

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

                cards_objects_array[n] = new cardObjectConstructor(cards_color[i], cards_value[j]);
            n++;
            }

        }

        var shuffled_deck = shuffleArray(cards_objects_array);
        return shuffled_deck;
    }

    var deck = createCardObject(cards_color, cards_value);

    function getCard(deck,target){

        var value = createCard(deck[i],target);
        i++;
        return value
    }

    function createCard(deck,target)
    {
        var card = document.createElement('img');
        card.src = "cards/"+deck.color+"/"+deck.value+".jpg";
        card.classList.add('cards');

        deck_value = countValueCards(deck);
        target.appendChild(card);
        return deck_value;
    }

    function countValueCards(deck){

        if (typeof deck.value != 'number') {

            switch(deck.value){

                case 'walet':
                    deck.value = 10
                break;

                case 'dama':
                    deck.value = 10
                break;

                case 'krol':
                    deck.value = 10
                break;

                case 'as':
                    deck.value = 11
                break;
            }
        }
        return deck.value;
    }


    function chooseCard(deck,table,result){
        var card_value = getCard(deck,table);
        result.textContent = card_value + parseInt(result.textContent);
        return result.textContent;
    }