/**
 *	URL encode / decode
 *	http://www.webtoolkit.info/
 **/
var URL = {
	// public method for url encoding
	encode : function (string) {
		return escape(this._utf8_encode(string));
	},
	// public method for url decoding
	decode : function (string) {
		return this._utf8_decode(unescape(string));
	},
	// private method for UTF-8 encoding
	_utf8_encode : function (string) {
		string = string.replace(/\r\n/g,"\n");
		var utftext = "";
		for (var n = 0; n < string.length; n++) {
			var c = string.charCodeAt(n);
			if (c < 128) {
				utftext += String.fromCharCode(c);
			} else if((c > 127) && (c < 2048)) {
				utftext += String.fromCharCode((c >> 6) | 192);
				utftext += String.fromCharCode((c & 63) | 128);
			} else {
				utftext += String.fromCharCode((c >> 12) | 224);
				utftext += String.fromCharCode(((c >> 6) & 63) | 128);
				utftext += String.fromCharCode((c & 63) | 128);
			}
		}
		return utftext;
	},
	// private method for UTF-8 decoding
	_utf8_decode : function (utftext) {
		var string = "";
		var i = 0;
		var c = c1 = c2 = 0;
		while ( i < utftext.length ) {
			c = utftext.charCodeAt(i);
			if (c < 128) {
				string += String.fromCharCode(c);
				i++;
			} else if((c > 191) && (c < 224)) {
				c2 = utftext.charCodeAt(i+1);
				string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
				i += 2;
			} else {
				c2 = utftext.charCodeAt(i+1);
				c3 = utftext.charCodeAt(i+2);
				string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
				i += 3;
			}
		}
		return string;
	}
}

jQuery(document).ready (function() {
	// TODO :: Externalize the valid domains
	//var domains = ['orange.lu', 'realdolmen.com'];
	var domains = ['orange.lu', 'google.com'];
	switchIframes();
	
	/**
	 * After loading the webpage, loop over all iframe elements and check if one of the url's parameters matches the iframe's id.
	 * The iframe's src attribute should be replaced with this parameter's value, after validating that this value is an url on one of the allowed domains.
	 */
	function switchIframes() {
		var iframes = document.getElementsByTagName('iframe');
		
		for (var i = 0; i < iframes.length; i++) {
			var iframe = iframes[i];
			var paramName = iframe.id; // The parameter name should match the iframe's id. 
			var paramValue = getParameterValue(paramName);
			if (paramValue != "") {
				if (isValidDomain(domains, paramValue)) {
					paramValue = URL.decode(paramValue);
					iframe.src = paramValue;
				} else {
					// TODO :: Probably best remove this. Just for testing purposes. (well a throw is acceptable, in case it doesn't break further JS...)
					throw ('Parameter "' + paramName + '" does not hold a valid value. Current value: "' + paramValue + '"');
				}
			}
		}	
	}
	
	/**
	 * Check whether or not the specified url is in one of the valid domains. This method does not support ports at the end of the url.
	 */
	function isValidDomain(arr, url) {
		for(var i = 0; i < arr.length; i++) {
			var dom = arr[i];
			if(url.match("." + dom) == "." + dom){
		      return true;
		    }
		}
		return false;
	}
	
	/**
	 * Get the value for the specified parameter name.
	 *
	 * Taken from: http://www.netlobo.com/url_query_string_javascript.html
	 */
	function getParameterValue(name) {
		name = name.replace(/[\[]/,"\\\[").replace(/[\]]/,"\\\]");
		var regexS = "[\\?&]"+name+"=([^&#]*)";
		var regex = new RegExp( regexS );
		var results = regex.exec(window.location.href);
		if(results == null) {
			return "";
		} else {
			return results[1];
		}
	}
})