(function () {
    var pressedKeys = {};

    function setKey(event, status) {
        var code = event.keyCode;
        var key;

        switch (code) {
            case 32:
                key = "SPACE";
                break;
            case 37:
                key = "LEFT";
                break;
            case 38:
                key = "UP";
                break;
            case 39:
                key = "RIGHT";
                break;
            case 40:
                key = "DOWN";
                break;
            case 88:
                key = "JUMP";
                break;
            case 90:
                key = "RUN";
                break;
            default:
                key = String.fromCharCode(code);
        }

        pressedKeys[key] = status;
    }

    document.addEventListener("keydown", function (e) {
        setKey(e, true);
    });

    document.addEventListener("keyup", function (e) {
        setKey(e, false);
    });

    window.addEventListener("blur", function () {
        pressedKeys = {};
    });

    window.input = {
        isDown: function (key) {
            return pressedKeys[key.toUpperCase()];
        },
        reset: function () {
            pressedKeys["RUN"] = false;
            pressedKeys["LEFT"] = false;
            pressedKeys["RIGHT"] = false;
            pressedKeys["DOWN"] = false;
            pressedKeys["JUMP"] = false;
        },
    };
})();