var State = require('./State');
var actions = Object.create(null);

/**
 *
 */
module.exports = {
    level: 0,

    subscribe(event, callback) {
        if (actions[event] === undefined) {
            actions[event] = [];
        }

        actions[event].push(callback);
    },

    publish(event) {
        if (actions[event] === undefined) {
            return;
        }

        var args = Array.prototype.slice.call(arguments, 1);

        actions[event].forEach(function(callback) {
            callback.apply(null, args);
        });
    }
};

module.exports.subscribe('level/complete', function() {
    module.exports.level++;
});