var IgeEventsLite = function () {}

IgeEventsLite.prototype.on = function (evtName, fn) {
if (evtName && fn) {
this.eventList[evtName] = this.eventList[evtName] || [];
this.eventList[evtName].push(fn);
}
}

IgeEventsLite.prototype.emit = function (evtName) {
if (evtName) {
this.eventList = this.eventList || [];
var args = [];
for (var i = 1; i < arguments.length; i++) {
args.push(arguments[i]);
}
if (evtName) {
var fnList = this.eventList[evtName];
for (var i in fnList) {
if (typeof fnList[i] == 'function') {
fnList[i].apply(this, args);
}
}
}
}
}

var jquery_lang_js = function () {
this.events = new IgeEventsLite();

this.on = this.events.on;
this.emit = this.events.emit;

return this;
}

jquery_lang_js.prototype.lang = {};
jquery_lang_js.prototype.defaultLang = 'en';
jquery_lang_js.prototype.currentLang = 'en';

jquery_lang_js.prototype.run = function () {
var langElems = $('[lang]');
var elemsLength = langElems.length;

while (elemsLength--) {
var elem = langElems[elemsLength];
var langElem = $(elem);

if (langElem.attr('lang') == this.defaultLang) {
if (langElem.is("input")) {
// An input element
switch (langElem.attr('type')) {
case 'button':
case 'submit':
langElem.data('deftext', langElem.val());
break;
}
} else {
// Not an input element
langElem.data('deftext', langElem.html());
}
}
}

this.change(this.currentLang);
}

jquery_lang_js.prototype.loadPack = function (packPath) {
$('<script type="text/javascript" charset="utf-8" src="' + packPath + '" />').appendTo("head");
}

jquery_lang_js.prototype.change = function (lang) {
//console.log('Changing language to ' + lang);
if (this.currentLang != lang) { this.update(lang); }
this.currentLang = lang;

// Get the page HTML
var langElems = $('[lang]');

if (lang != this.defaultLang) {
var elemsLength = langElems.length;
while (elemsLength--) {
var elem = langElems[elemsLength];
var langElem = $(elem);
if (langElem.data('deftext')) {
if (langElem.is("input")) {
// An input element
switch (langElem.attr('type')) {
case 'button':
case 'submit':
// A button or submit, change the value attribute
var currentText = langElem.val();
var defaultLangText = langElem.data('deftext');

var newText = this.lang[lang][defaultLangText] || currentText;
var newHtml = currentText.replace(currentText, newText);
langElem.val(newHtml);

if (currentText != newHtml) {
langElem.attr('lang', lang);
}
break;
}
} else {
// Not an input element
var currentText = langElem.html();
var defaultLangText = langElem.data('deftext');

var newText = this.lang[lang][defaultLangText] || currentText;
var newHtml = currentText.replace(currentText, newText);
langElem.html(newHtml);

if (currentText != newHtml) {
langElem.attr('lang', lang);
}
}
} else {
//console.log('No language data for element... have you executed .run() first?');
}
}
} else {
// Restore the deftext data
langElems.each(function () {
var langElem = $(this);
if (langElem.data('deftext')) {
if (langElem.is("input")) {
// An input element
switch (langElem.attr('type')) {
case 'button':
case 'submit':
langElem.val(langElem.data('deftext'));
break;
}
} else {
langElem.html(langElem.data('deftext'));
}
}
});
}
}

jquery_lang_js.prototype.update = function (lang) {
this.emit('update', lang);
}