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/**

* A very basic event module that helps to generate and catch events.

*

* @module Chartist.Event

*/

/* global Chartist */

(function (globalRoot, Chartist) {

'use strict';

Chartist.EventEmitter = function () {

var handlers = [];

/**

* Add an event handler for a specific event

*

* @memberof Chartist.Event

* @param {String} event The event name

* @param {Function} handler A event handler function

*/

function addEventHandler(event, handler) {

handlers[event] = handlers[event] || [];

handlers[event].push(handler);

}

/**

* Remove an event handler of a specific event name or remove all event handlers for a specific event.

*

* @memberof Chartist.Event

* @param {String} event The event name where a specific or all handlers should be removed

* @param {Function} [handler] An optional event handler function. If specified only this specific handler will be removed and otherwise all handlers are removed.

*/

function removeEventHandler(event, handler) {

// Only do something if there are event handlers with this name existing

if(handlers[event]) {

// If handler is set we will look for a specific handler and only remove this

if(handler) {

handlers[event].splice(handlers[event].indexOf(handler), 1);

if(handlers[event].length === 0) {

delete handlers[event];

}

} else {

// If no handler is specified we remove all handlers for this event

delete handlers[event];

}

}

}

/**

* Use this function to emit an event. All handlers that are listening for this event will be triggered with the data parameter.

*

* @memberof Chartist.Event

* @param {String} event The event name that should be triggered

* @param {*} data Arbitrary data that will be passed to the event handler callback functions

*/

function emit(event, data) {

// Only do something if there are event handlers with this name existing

if(handlers[event]) {

handlers[event].forEach(function(handler) {

handler(data);

});

}

// Emit event to star event handlers

if(handlers['*']) {

handlers['*'].forEach(function(starHandler) {

starHandler(event, data);

});

}

}

return {

addEventHandler: addEventHandler,

removeEventHandler: removeEventHandler,

emit: emit

};

};

}(this || global, Chartist));