var isCtrlKeyPressed = false;
var isShiftKeyPressed = false;
var lastSelectedRow = -1;
var numRequests = 0;

var onKeyPress = (e) => {
    if (_currentWindowId == null || _currentTable == null)
        return;

    if (e.ctrlKey)
        isCtrlKeyPressed = true;
    if (e.shiftKey)
        isShiftKeyPressed = true;

    if (isCtrlKeyPressed && e.key == 'a') {
        _currentTable.rows().select();
        isShiftKeyPressed = false;

        e.preventDefault();
        e.stopPropagation();
    }

    if (e.key == 'ArrowUp') {
        if (!isShiftKeyPressed)
            _currentTable.rows().deselect();

        var selectedItems = _currentTable.rows(".selected").indexes();
        if (selectedItems.length == 1)
            lastSelectedRow = selectedItems[0] - 1;

        var row = _currentTable.row(lastSelectedRow, { order: 'current' });
        var el = row.node();

        if ($(el).hasClass("selected") && lastSelectedRow > 0) {
            row.deselect();
        }
        else
            row.select();

        el.scrollIntoView({ block: "center" });

        if(lastSelectedRow > 0)
            lastSelectedRow--;
    }
    if (e.key == 'ArrowDown') {
        if (!isShiftKeyPressed)
            _currentTable.rows().deselect();

        var selectedItems = _currentTable.rows(".selected").indexes();
        if (selectedItems.length == 1)
            lastSelectedRow = selectedItems[0];

        var row = _currentTable.row(lastSelectedRow + 1);
        var el = row.node();
        if ($(el).hasClass("selected") && lastSelectedRow < _currentTable.rows().indexes().length - 2) {
            row.deselect();
        }
        else
            row.select();

        el.scrollIntoView({ block: "center" });

        if (lastSelectedRow < _currentTable.rows().indexes().length - 2)
            lastSelectedRow++;
    }
    numRequests++;

    var redrawTable = function () {
        if (numRequests > 1)
            return;

        _currentTable.draw(false);
        numRequests = 0;
    };

    window.setTimeout(redrawTable, 50);
}

var onKeyUp = (e) => {
    if (e.ctrlKey)
        isCtrlKeyPressed = false;
    if (e.shiftKey)
        isShiftKeyPressed = false;
}

$(function () {
    $(document).on("keydown", onKeyPress);
    $(document).on("keyup", onKeyUp);
});