; (function (root, factory) {
    // Browser globals
    root.MyEvent = factory();
}(typeof self !== 'undefined' ? self : this, function () {

    let registeredEvents = [];
    let supportedEvents = ['click', 'submit', 'change'];

    function isValidSelector(selector) {
        let matches = null;

        matches = selector.match(/^#([a-zA-Z0-9\-\_]+)$/);
        if (matches) {
            return {
                type: 'ID',
                value: matches[1]
            };
        }

        matches = selector.match(/^\.([a-zA-Z0-9\-\_]+)$/);
        if (matches) {
            return {
                type: 'CLASS',
                value: matches[1]
            };
        }

        matches = selector.match(/^([a-z][a-z0-9]{0,20})$/);
        if (matches) {
            return {
                type: 'TAG',
                value: matches[1]
            };
        }
        return false;
    }

    function addEventListener(event, selector, callback) {
        if (!supportedEvents.includes(event)) {
            throw new Error('Event \'' + event + '\' is not suppored.');
        }

        let sel = isValidSelector(selector);
        if (!sel) {
            throw new Error('Invalid registered event selector \'' + selector + '\'.');
        }

        registeredEvents.push({
            event: event,
            selector: sel,
            callback: callback
        });
    }

    supportedEvents.forEach(function (event) {
        document.addEventListener(event, function (e) {
            let element = e.target;

            let listeners = registeredEvents.filter(function (item) {
                return item.event === event;
            });

            listeners.forEach(function (listener) {
                let type = listener.selector.type;
                let value = listener.selector.value;

                let myCurrentTarget = null;
                if (type === 'ID') {
                    myCurrentTarget = element.closest('#' + value);
                } else if (type === 'CLASS') {
                    myCurrentTarget = element.closest('.' + value);
                } else if (type === 'TAG') {
                    myCurrentTarget = element.closest(value);
                }

                if (myCurrentTarget) {
                    e.myCurrentTarget = myCurrentTarget;
                    listener.callback(e);
                }
            });

            // console.log(executableListeners.length + ' listener' +
            //     (executableListeners.length == 1 ? '' : 's') + ' executed');
        });
    });


    return {
        addEventListener: addEventListener
    };
}));