import QtQuick 2.15

Item {
    property alias cards: cardArea.cards
    property alias length: cardArea.length
    property var selectedCards: []

    signal cardSelected(int cardId, bool selected)

    id: area

    CardArea {
        anchors.fill: parent
        id: cardArea
        onLengthChanged: area.updateCardPosition(true);
    }

    function add(inputs)
    {
        cardArea.add(inputs);
        if (inputs instanceof Array) {
            for (let i = 0; i < inputs.length; i++)
                filterInputCard(inputs[i]);
        } else {
            filterInputCard(inputs);
        }
    }

    function filterInputCard(card)
    {
        card.autoBack = true;
        card.draggable = true;
        card.selectable = false;
        card.clicked.connect(adjustCards);
    }

    function remove(outputs)
    {
        let result = cardArea.remove(outputs);
        let card;
        for (let i = 0; i < result.length; i++) {
            card = result[i];
            card.draggable = false;
            card.selectable = false;
            card.selectedChanged.disconnect(adjustCards);
        }
        return result;
    }

    function enableCards(cardIds)
    {
        let card, i;
        for (i = 0; i < cards.length; i++) {
            card = cards[i];
            card.selectable = cardIds.contains(card.cid);
            if (!card.selectable) {
                card.selected = false;
                unselectCard(card);
            }
        }
    }

    function updateCardPosition(animated)
    {
        cardArea.updateCardPosition(false);

        let i, card;
        for (i = 0; i < cards.length; i++) {
            card = cards[i];
            if (card.selected)
                card.homeY -= 20;
        }

        if (animated) {
            for (i = 0; i < cards.length; i++)
                roomScene.cardItemGoBack(cards[i], true)
        }
    }

    function adjustCards()
    {
        area.updateCardPosition(true);

        for (let i = 0; i < cards.length; i++) {
            let card = cards[i];
            if (card.selected) {
                if (!selectedCards.contains(card))
                    selectCard(card);
            } else {
                if (selectedCards.contains(card))
                    unselectCard(card);
            }
        }
    }

    function selectCard(card)
    {
        selectedCards.push(card);
        cardSelected(card.cid, true);
    }

    function unselectCard(card)
    {
        for (let i = 0; i < selectedCards.length; i++) {
            if (selectedCards[i] === card) {
                selectedCards.splice(i, 1);
                cardSelected(card.cid, false);
                break;
            }
        }
    }

    function unselectAll(exceptId) {
        let card = undefined;
        for (let i = 0; i < selectedCards.length; i++) {
            if (selectedCards[i].cid !== exceptId) {
                selectedCards[i].selected = false;
            } else {
                card = selectedCards[i];
                card.selected = true;
            }
        }
        if (card === undefined) {
            selectedCards = [];
        } else {
            selectedCards = [card];
        }
        updateCardPosition(true);
    }
}