// this doesn't properly deal with eg, .gov.uk .co.ck etc
function parseDomain(host){
  var chunks = host.split(".")
  if (chunks.length == 1) return chunks[0]
  else return chunks[chunks.length - 2]
}

function escapeHtml(txt) {
    if (!txt) { return ""; }
    // txt = annoyingCaps(txt)
    return $("<span>").text(txt).html()
}


URLRegex = /((\b(http\:\/\/|https\:\/\/|ftp\:\/\/)|(www\.))+(\w+:{0,1}\w*@)?(\S+)(:[0-9]+)?(\/|\/([\w#!:.?+=&%@!\-\/]))?)/gi;
PicRegex = /\.(jpg|jpeg|png|gif|bmp|svg|fid)$/i;
RecipRegex = /(^|\s)@\w+/g;
TopicRegex = /(^|\s)#\w+/g;


function getImagesAsArray(text) {
  var imgs = []
  var urls = text.match(URLRegex)
  if (urls === null) return imgs
  for (var i = 0; i<urls.length; i++){
    var url = urls[i]
    var urlWithoutParams = url.replace(/\?.*$/i, "");
    if (PicRegex.test(urlWithoutParams))
      imgs.push(url)
  }
  return imgs
}

function topicReplace(text) {
    text = $.trim(text).toLowerCase();
    var topicLabel = text.substring(1);
    return ' <a target="_blank" href="'+ RootDomain + 't/' + topicLabel + '">' + text + '</a> ';
}

function recipientReplace(atText, recips) {
    recips = recips || [];

    var space = '';    
    if (atText[0] == ' ') {
        atText = atText.slice(1);
        space = ' ';
    }
    
    var nick = atText.slice(1).toLowerCase();
    var matchedRecip;
    for (var i = 0; i < recips.length; i++) {
        if (recips[i].toLowerCase() == nick) {
            matchedRecip = recips[i];
            break;
        }
    }
    
    if (matchedRecip) {
        return space + '<a target="_blank" href="' + RootDomain + matchedRecip + '">@' + matchedRecip + '</a>';
    } else {
        return space + atText;
    }
}

function linkify(text, recips) {
    LastMsgContainsImage = false;
    var recipWrapper = function(text) { return recipientReplace(text, recips); };
    return text
        .replace(URLRegex, linkReplace)
        .replace(RecipRegex, recipWrapper)
        .replace(TopicRegex, topicReplace);
}

// use this in escapeHtml to turn everyone's text lIkE tHiS
function annoyingCaps(text){
  var chunks = text.split(" ")
  for(var i=0; i<chunks.length; i++){
    var chunk = chunks[i]
    if (!chunk.length || chunk.substr(0,4) == 'http') continue;
    var letters=chunk.split("")
    for(var j = 0; j<letters.length; j++){
      if (j % 2) letters[j] = letters[j].toUpperCase()
      else letters[j] = letters[j].toLowerCase()
    }
    chunks[i] = letters.join("")
  } 
  return chunks.join(" ")
}


function imgClickHandler() {
	// Ugly hack. Don't open new links in chat, only in logs.
	// Ugly hack mkII: ensure middle-click opens images in new tab
	// c.f. http://code.google.com/p/chromium/issues/detail?id=255
	if ($.browser.webkit && event.button != 0) {
		event.stopPropagation();
	} else {
		return $('#chatrap').length == 0;
	}
}

// durty hack to use a global to check this... but otherwise i'd have to rewrite the String.replace function? :/
var LastMsgContainsImage = false
function linkReplace(url) {
    var lowerurl = url.toLowerCase();
    if (lowerurl.indexOf('http://') == 0 || lowerurl.indexOf('https://') == 0 || lowerurl.indexOf('ftp://') == 0)
        linkUrl = url;
    else
        linkUrl = 'http://' + url;

    var uri = parseUri(url)
    var type = getUriType(uri)
    
    if (type == 'image') {
      LastMsgContainsImage = true;
      return "<a target='_blank' href='" + linkUrl + "' class='img-wrapper' onclick='return imgClickHandler()'><img src='" + linkUrl + "' class='unbound'></a>";
    } else if (type == 'youtube') {
      Youtube.startAnimation();
      return "<a target='_blank' class='youtube' href='" + linkUrl + "'>" +
             "<img class='youtube-thumb' width='130' height='97' src='"+Youtube.nextThumbUrl(uri.queryKey.v)+"'>" + 
             "<img class='youtube-controls' src='/static/img/youtube.controls.png'></a>"
    } else if (type == 'midi') {
      return '<embed src="'+linkUrl+'" autostart="false" loop="false" volume="80" width="150" height="20" style="vertical-align:bottom"> <a href="'+linkUrl+'">'+uri.file+'</a>'
    } else if (type == 'wav') {
      return '<audio src="'+linkUrl+'" controls volume="80" width="150" height="20" style="vertical-align:bottom"></audio> <a href="'+linkUrl+'">'+uri.file+'</a>'
    } else
        return "<a target='_blank' href='" + linkUrl + "'>" + url + "</a>";
    
}


function getUriType(uri){
  if (PicRegex.test(uri.file.toLowerCase()))
    return "image";
  
  var domain = parseDomain(uri.host)
  
  if (domain == "gstatic" && uri.path == "/images" && 'q' in uri.queryKey)
    return "image"; 
  
 // actual image url = uri.queryKey['q'].split(":").slice(2).join(":") but often the original image is broken...


  if (domain == "youtube" && ('v' in uri.queryKey || uri.anchor.indexOf('v') != -1))
    return "youtube";
  
  if (uri.path.substr(-4) == ".mid" || uri.path.substr(-5) == ".midi")
    return "midi"

  if (uri.path.substr(-4) == ".wav")
    return "wav"

  
  return "link";
}

function linkifyWithoutImage(text) {
    LastMsgContainsImage = false
    return text.replace(URLRegex, linkReplaceWithoutImage);
}

function linkReplaceWithoutImage(url){
    var urlWithoutParams = url.replace(/\?.*$/i, "");
    linkUrl = url.indexOf('http://') == 0 ? url : 'http://' + url;

    return "<a target='_blank' href='" + linkUrl + "'>" + url + "</a>"
}