/**
 * @author Roy Arisse roy@ewingsict.nl
 * @param {object} oOptions Should look like: {sIdContainer: 'id', sResultsUrl: '/results.json'}
 * @param {object} oLang Optional, should look like: {sNoResults: 'text', sInvalidJson: 'text', sUnknownError: 'text'}
 * All parameters or parameter siblings are optional, if not set, JS will try to use defaults
 * jslint browser: true, sloppy: true, maxerr: 50, indent: 4
 */
function LoadTwitters(oOptions, oLang) {
	if (oOptions === undefined) {
		oOptions = {};
	}

	if (oLang === undefined) {
		oLang = {};
	}

	this.options = {
		container_id: oOptions.hasOwnProperty('sIdContainer') ? oOptions.sIdContainer : null,
		results_url: oOptions.hasOwnProperty('sResultsUrl') ? oOptions.sResultsUrl : '/twittersearch.json'
	};

	this.lang = {
		no_results: oLang.hasOwnProperty('sNoResults') ? oLang.sNoResults : 'Geen tweets weer te geven',
		invalid_json: oLang.hasOwnProperty('sInvalidJson') ? oLang.sInvalidJson : 'De server retourneerde een ongeldig antwoord',
		unknown_error: oLang.hasOwnProperty('sUnknownError') ? oLang.sUnknownError : 'Er heeft zich een onbekende fout voorgedaan.'
	};

	if (!this.options.container_id.length) {
		return false;
	}

	return this.construct();
}

LoadTwitters.prototype = {
	construct: function () {
		var oSelf = this;
		this.container = document.getElementById(this.options.container_id);
		if (this.container === null) {
			return false;
		}

		// Add results list to the body
		this.feedList = document.createElement('ul');
		this.container.appendChild(this.feedList);
		this.toggleLoading(this.container, true);

		return new Ajax.Request(this.options.results_url, {
			method: 'get',
			evalJSON: 'force',
			timeout: 30000,
			onSuccess: function (transport) {
				var items = transport.responseJSON,
					tweet = 0;

				if (!items.length) {
					return this.onError('no_results');
				}

				for (tweet = 0; tweet < items.length; tweet += 1) {
					oSelf.addTweet(items[tweet]);
				}

				return true;
			},
			onComplete: function () {
				oSelf.toggleLoading(oSelf.container, false);
			},
			onFailure: function () {
				oSelf.toggleLoading(oSelf.container, false);
				oSelf.onError('invalid_json');
			}
		});
	},

	addTweet: function (oTweet) {
		var oLi = document.createElement('li'),
			oImageA = document.createElement('a'),
			oImage = document.createElement('img'),
			oH4 = document.createElement('h4'),
			oP = document.createElement('p');

		this.feedList.appendChild(oLi);

		// Add image
		oImageA.setAttribute('href', oTweet.user_url);

		oImage.setAttribute('src', oTweet.profile_image);
		oImageA.appendChild(oImage);
		oLi.appendChild(oImageA);

		// Add title
		oH4.innerHTML = '<a href="' + oTweet.user_url + '">' + oTweet.from_user + '</a>';
		oH4.setAttribute('class', 'title');
		oLi.appendChild(oH4);

		// Add tweetcontent
		oP.innerHTML = oTweet.content + '<br /><a href="' + oTweet.url + '" class="strong">' + oTweet.date + '</a>';

		oLi.appendChild(oP);
	},

	toggleLoading: function (oContainer, bIsLoading) {
		oContainer.className = bIsLoading ? 'loading' : '';
		return true;
	},

	onError: function (sErrorIdentifier) {
		var oErrorElement = document.createElement('p'),
			oErrorText = null;

		if (!this.lang.hasOwnProperty(sErrorIdentifier)) {
			sErrorIdentifier = 'unknown_error';
		}

		oErrorElement.className = 'error';
		oErrorText = document.createTextNode(this.lang[sErrorIdentifier]);
		oErrorElement.appendChild(oErrorText);

		this.container.innerHTML = null;
		this.container.appendChild(oErrorElement);
		return true;
	}
};