var message, tracker;

tracker = new Clickago();

message = function (text) {
    alert(text);
};

tracker.register({
    method: message,
    thisArg: window,
    arguments: ["You're fired!"]
}, {
    method: message,
    thisArg: window,
    arguments: ["My bad. You can keep your job."]
});

message("You're fired!"); // Alerts "You're fired!"

tracker.undo(); // Alerts "My bad. You can keep your job."

tracker.redo(); // Alerts "You're fired!"

tracker.disable();

tracker.undo(); // returns undefined;

trakcer.canUndo; // false
tracker.canRedo; // false

tracker.enable();

tracker.undo(); // Alerts "My bad. You can keep your job."

(function () {
    "use strict";

    var tracker, comments;

    // Initialise Clickago class.
    tracker = new Clickago();

    comments = [];

    // Inserting comments to the collection.
    function insertComment (comment) {
        comments[comments.length] = comment;
    };

    // Removing comments from the collection.
    function removeComment (index) {
        comments.splice(index, 1);
    };

    // Wraper function around `insertComment` which registers the events.
    function addComment (comment) {
        tracker.register({
            method: insertComment,
            thisArg: null,
            arguments: [comment]
        }, {
            method: removeComment,
            thisArg: null,
            arguments: [comments.length]
        });

        insertComment(comment);
    }

    // Wraper function around `insertComment` which registers the events.
    function deleteComment (index) {
        tracker.register({
            method: removeComment,
            thisArg: null,
            arguments: [index]
        }, {
            method: insertComment,
            thisArg: null,
            arguments: [comments[index]]
        });

        removeComment(index);
    };

    addComment("Comment 1");
    console.log(comments); // Logs ["Comment 1"]

    addComment("Comment 2");
    console.log(comments); // Logs ["Comment 1", "Comment 2"]

    addComment("Comment 3");
    console.log(comments); // Logs ["Comment 1", "Comment 2", "Comment 3"]

    deleteComment(2);
    console.log(comments); // Logs ["Comment 1", "Comment 2"]

    tracker.undo();
    console.log(comments); // Logs ["Comment 1", "Comment 2", "Comment 3"]

    tracker.redo();
    console.log(comments); // Logs ["Comment 1", "Comment 2"]

    tracker.undo();
    console.log(comments); // Logs ["Comment 1", "Comment 2", "Comment 3"]

    tracker.undo();
    console.log(comments); // Logs ["Comment 1", "Comment 2"]

    tracker.undo();
    console.log(comments); // Logs ["Comment 1"]

    tracker.undo();
    console.log(comments); // Logs []
})();