function get(id) {	return document.getElementById(id); }
function trim(str) { return str.replace(/^\s+|\s+$/g, ''); }
function noCache(uri){return uri.concat(/\?/.test(uri)?"&":"?","noCache=",(new Date).getTime(),".",Math.random()*1234567)};
function initxhr() {
	xhr = false;
	if(window.XMLHttpRequest) {
			xhr = new XMLHttpRequest();
	}
	
	if(!xhr)  {
		xhr = new ActiveXObject("MSXML2.XMLHTTP");
	}
	
	if(!xhr) {
		xhr = new ActiveXObject("Microsoft.XMLHTTP");
	}
	
	return xhr;
}

function submit_data(url, data) {
	var url_arguments = "";
	for(var key in data) {
		url_arguments += key + ":"
		url_arguments += safe_encoded(data[key]) + '/';
	}

	window.location = url + '/' + url_arguments;
}

function safe_encoded(text) {

	text += '';
	var hex = '0123456789abcdef';
	var ord_A = 'A'.charCodeAt(0);
	var ord_Z = 'Z'.charCodeAt(0);
	var ord_a = 'a'.charCodeAt(0);
	var ord_z = 'z'.charCodeAt(0);
	var ord_0 = '0'.charCodeAt(0);
	var ord_9 = '9'.charCodeAt(0);	
	
	var output = "";
	
	for(i = 0; i < text.length; i++) {
		var ord = text.charCodeAt(i);
		if( ( (ord > ord_A) && (ord <= ord_Z) )   ||
			( (ord >= ord_a) && (ord <= ord_z) ) ||
			( (ord >= ord_0) && (ord <= ord_9) ) ) {
				output += text.charAt(i);
		} else {
				output += 'A';
				var lower = ord % 16;
				var upper = (ord-lower) / 16;
				output += hex[upper] + hex[lower];
		}
	}			
	return output;
}		

function do_nothing() {
	return false;
}

function CometsHandler(error_report_callback, notify_connection_alive) {
	var cometsHandler = {comets: {}};
	var request;
	var comet_status = false;
	
	function timeout_wrapper() {
		error_report_callback();
		setTimeout(cometsHandler.start, 50);
	}

	function errorHandler() {
		// just wait five seconds and try again
		setTimeout(cometsHandler.start, 5000);
	}
		
	function cometComplete(json, initial_call) {
		if(!initial_call && notify_connection_alive) {
			notify_connection_alive();
		}
		
		for(var comet_name in json) {
			var comet = cometsHandler.comets[comet_name];
			comet.callback(json[comet_name], comet);
		}
		
		var urls = [];
		for(var comet_name in cometsHandler.comets) {
			var comet = cometsHandler.comets[comet_name]
			urls.push(comet.url + comet.channel_id + '/' + comet.last_id)
		}
		var url = '/comet' + urls.join('::')
		
		if(comet_status) {
			request = ajax(url, cometComplete, timeout_wrapper, 3 * 60, errorHandler);
		}
	}
	
	cometsHandler.start = function() {
		if(request) {
			request.cancel();
		}
		comet_status = true;
		cometComplete({}, true);
	}
	
	cometsHandler.stop = function() {
		comet_status = false;
		if(request) {
			request.cancel();
		}
	}
	
	cometsHandler.add = function(name, comet) {
		cometsHandler.comets[name] = comet;
	}

	cometsHandler.remove = function(name) {
		delete cometsHandler.comets[name];
	}
	
	cometsHandler.has = function(name) {
		return cometsHandler.comets[name] ? true : false;
	}
	
	return cometsHandler;
}

function linkify(comment) {
	var words = comment.split(/\s/);
	var new_words = [];	
	var url;

	for(var cnt = 0; cnt < words.length; cnt++) {
		word = words[cnt];
		var extracted_word = extract_from_parens(word);

		if(url = word_to_url(extracted_word)) {
			new_words.push('<a href="' + url + '" target="_blank">' + word + '</a>');
		} else {
			new_words.push(word);
        }
	}
	var text = new_words.join(" ");
	
	var regexp = /#(\S+)/g;
	return text.replace(regexp,'<span class="twitterTag">#$1</span>');
}

function extract_from_parens(word) {
	if(word.match(/^\((.*)\)$/)) {
		return RegExp.$1;
	} else if(word.match(/^\{(.*)\}$/)) {
		return RegExp.$1;
	} else if(word.match(/^\[(.*)\]$/)) {
		return RegExp.$1;
	} else {
		return word;
    }
}

function word_to_url(word) {
	// starts with a transfer protocal
	if(word.match(/^(ftp|http|https):\/\/(.*)/i)) {
		return word;
	// starts with a domain name
	} else if(word.match(/^([a-z0-9\-]+)(\.[a-z0-9\-]+)+(.)*/i)) {
		return 'http://' + word;
	}
}

function createCookie(name,value,days) {
	if (days) {
		var date = new Date();
		date.setTime(date.getTime()+(days*24*60*60*1000));
		var expires = "; expires="+date.toGMTString();
	}
	else var expires = "";
	document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name) {
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i < ca.length;i++) {
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
	}
	return null;
}

function eraseCookie(name) {
	createCookie(name,"",-1);
}