// eventProxy.js

'use strict';

const eventProxy = {

    onObj: {},

    oneObj: {},

    on: function(key, fn) {

        if(this.onObj[key] === undefined) {

            this.onObj[key] = [];

        }

        this.onObj[key].push(fn);

    },

    one: function(key, fn) {

        if(this.oneObj[key] === undefined) {

            this.oneObj[key] = [];

        }

        this.oneObj[key].push(fn);

    },

    off: function(key) {

        this.onObj[key] = [];

        this.oneObj[key] = [];

    },

    trigger: function() {

        let key, args;

        if(arguments.length == 0) {

            return false;

        }

        key = arguments[0];

        args = [].concat(Array.prototype.slice.call(arguments, 1));

        if(this.onObj[key] !== undefined

          && this.onObj[key].length > 0) {

            for(let i in this.onObj[key]) {

                this.onObj[key][i].apply(null, args);

            }

        }

        if(this.oneObj[key] !== undefined

          && this.oneObj[key].length > 0) {

            for(let i in this.oneObj[key]) {

                this.oneObj[key][i].apply(null, args);

                this.oneObj[key][i] = undefined;

            }

            this.oneObj[key] = [];

        }

    }

};

export default eventProxy;