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

// http://stackoverflow.com/questions/37684/replace-url-with-html-links-javascript
function linkify(text) {
    var exp = /(\b(https?|ftp|file):\/\/[-A-Z0-9+&@#\/%?=~_|!:,.;]*[-A-Z0-9+&@#\/%=~_|])/gi;
    return text.replace(exp,"<a href='$1'>$1</a>");
}
 
// http://snippets.dzone.com/posts/show/6995
var URLRegex = /^((http\:\/\/|https\:\/\/|ftp\:\/\/)|(www\.))+(\w+:{0,1}\w*@)?(\S+)(:[0-9]+)?(\/|\/([\w#!:.?+=&%@!\-\/]))?$/i
var PicRegex = /\.(jpg|jpeg|png|gif|bmp)$/i;

function isImage(content) {
    var match = URLRegex.exec(content);
    sansParams = match && match[0].replace(/\?.*$/i, "");
    return sansParams && PicRegex.test(sansParams);
}

function buildMsgContent(content) {
    if (isImage(content)) {
        return '<a href="' + content + '" target="_blank">'
            + '<img src="'+ content + '" /></a>';
    } else {
        return linkify(escapeHtml(content));
    }
}

function buildMessageDiv(msg) {
    var nick = escapeHtml(msg.nick);
    return '<div class="msgDiv"><b><a href="/u/' + nick + ' ">' + nick + '</a>: </b>'
        + buildMsgContent(msg.content) + '</div>';
}

function buildGrowlDataAndPopDatShit(msg) {
	var nick = escapeHtml(msg.nick);
	nick = '<a href="/u/' + nick + ' " style="color:pink">' + nick + '</a>:'
	var msg = buildMsgContent(msg.content)
	growl(nick, msg)
}

function buildUserDiv(user) {
    if (user.avatar) {
        return '<div class="username"><a href="/u/' + escapeHtml(user.nick) + '">' +
	'<img src="' + user.avatar + '" width="50" height="50">' + 
	escapeHtml(user.nick) + '</a></div>';
    } else {
        return '<div class="username"><a href="/u/' + escapeHtml(user.nick) + '">' +
	escapeHtml(user.nick) + '</a></div>';
    }
}

function handleMsgError(resp) {
    var respText = resp.responseText ? resp.responseText.trim() : false;
    if (respText  == 'MUST_LOGIN') {
        alert("Can't send message! Please login.");
    } else if (respText) {
        alert("Can't send message! (" + respText + ")");
    } else {
        alert("Can't send message!");
    }
}

function submitMessage() {
    var content = $.trim($('#msgInput').val());
    if (content ==  '') { return; }
    PostedMessages.push(content);
    $('#msgInput').val('');

    updateUI([{ 'nick': Nick, 'content': content}], null);

    var onSuccess = function(json) {};    
    var onError = function(resp, textStatus, errorThrown) {        
        $('#msgInput, #msgSubmit').removeAttr('disabled');
        handleMsgError(resp);
    };
    
    $.ajax({
	type: 'GET',
	timeout: 5000,
	url: '/msg',
	data: { 'room': Room, 'content': content },
	cache: false,
	dataType: 'json',
	success: onSuccess,
	error: onError
    });  
}

function ifEnter(fn) {
    return function(e) {
        if (e.keyCode == 13) { fn(); }
    };
}

function isScrolledToBottom(div) {
    return Math.abs(div.scrollTop - (div.scrollHeight - div.offsetHeight)) <= 3;
}

function scrollToBottom(div) {
    div.scrollTop = div.scrollHeight;
}

// Give images time to start loading before scrolling.
// Needed until server knows size of images.
function delayedScrollToBottom(delay) {
    setTimeout(scrollToBottom, delay, $('#messageList')[0]);
}

function updateUI(msgs, users) {
	if (window['growlize'] && msgs !== null) {
		$.map(msgs, buildGrowlDataAndPopDatShit)
	}
    else if (msgs !== null) {
        var msgStr = $.map(msgs, buildMessageDiv).join('');
        var wasScrolledToBottom = isScrolledToBottom($('#messageList')[0]);
        $('#messageList').append(msgStr);
        
        if (wasScrolledToBottom) {
            delayedScrollToBottom(500);
        }
    }
    if (users !== null) {
        $("#userList").html($.map(users, buildUserDiv).join(''));
    }
}

// A duplicate message is a message that was likely to have
// originated from this browser.
function isDuplicateMessage(m) {
    if (m.nick != Nick || $.inArray(m.content, PostedMessages) == -1) {
        return false;
    }
    var now = new Date().getTime();
    return m.created_on - now < 5000;
}

function refresh() {
    var onSuccess = function(json) {
        try {
            Timestamp = json.timestamp;
            var messages = $.grep(
                json.messages,
                function(m) { return !isDuplicateMessage(m) });
            updateUI(messages, json.users);
            if (typeof UnseenMsgCounter !== 'undefined') {
                UnseenMsgCounter += messages.length;
            }
        } catch(e) {
            if (IsAdmin) {
                alert("Exception in refresh");
                console.log(e);
            }
        }
        setTimeout(refresh, 1000);
    };
    var onError = function(resp, textStatus, errorThrown) {
        if (IsAdmin) {
            console.log(resp, textStatus, errorThrown);
        }
        setTimeout(refresh, 1000);
    };

    $.ajax({
        type: 'GET',
        timeout: 5000,
        url: '/refresh',
        data: { 'room': Room, 'since': Timestamp },
        cache: false,
        dataType: 'json',
        success: onSuccess,
        error: onError
    });
}

function initChat() {
    $('.msgDiv .content').each(function() {
        var t = $(this);
        t.html(buildMsgContent(t.text()));
    });

    $('#msgInput').keyup(ifEnter(submitMessage));
    $('#msgSubmit').click(submitMessage);

    delayedScrollToBottom(500);
    setTimeout(refresh, 1000);
}

function initProfile() {
    $('.logged-dump .content').each(function() {
        var t = $(this);
        t.html(buildMsgContent(t.text()));
    });

    var onSubmit = function(original_element, edit, old) {
        edit = $.trim(edit);
        if (edit == old) { return old };
        // TODO: Prevent entering script tags
        if (original_element == 'avatar' && edit.indexOf("<") != -1) {
            return old;
        }
        $.ajax({
            type: "GET",
            timeout: 5000,
            url: "/update-profile",
            data: { 'attr': original_element, 'val': edit }
        });
        if (original_element == 'avatar') {            
            var s = '<img id="avatarPic" src="' + edit + '" width="150" />';
            $('#avatarPic').replaceWith(s);
        }
        return escapeHtml(edit);
    };

    var opt = { 'default_text': 'Enter here!',
                'callback': onSubmit,
                'field_type': 'text',
                'callbackShowErrors': false };    
    $('#avatar.editable').editInPlace(opt);


    opt['field_type'] = 'textarea';
    $('#contact.editable, #bio.editable').editInPlace(opt);

};

function initLog() {
    $('.logged-dump .content').each(function() {
        var t = $(this);
        t.html(buildMsgContent(t.text()));
    });

}

function growl(user, msg) {
	$.gritter.add({
		// (string | mandatory) the heading of the notification
		title: user,
		// (string | mandatory) the text inside the notification
		text: msg 
	});
}