xmppchat.UI = (function (xmppUI, $, console) {
    var ob = xmppUI;
    ob.chats = [];
    ob.chat_focus  = [];
    ob.chatbox_width = 205;

    ob.sanitizePath = function (call) { 
        return xmppchat.base_url + call; 
    };

    ob.updateOnPresence = function (jid, status, presence) {
        // TODO: When a presence indicator shows that a resource has
        // gone offline, we need to look in the ChatPartners storage to see
        // if there are more storages before we mark the user as offline in the UI.
        var user_id = Strophe.getNodeFromJid(jid),
            barejid = Strophe.getBareJidFromJid(jid),
            existing_user_element = $('#online-users-' + user_id),
            online_count;
        if (barejid === Strophe.getBareJidFromJid(jarnxmpp.connection.jid)) {
            return;
        }
        if (existing_user_element.length) {
            if (status === 'offline' && jarnxmpp.Presence.online.hasOwnProperty(user_id)) {
                existing_user_element.attr('class', status);
                return;
            }
            existing_user_element.attr('class', status);
        } else {
            $.get(portal_url + '/xmpp-userDetails?jid=' + barejid, function (user_details) {
                // FIXME: this ajax call returns a bunch of unnecessary stuff...
                if ($('#online-users-' + user_id).length > 0) {
                    return;
                }
                user_details = $(user_details);
                $('#online-users').append(user_details);
                $('#online-users li[data-userid]').sortElements(function (a, b) {
                    return $('a.user-details-toggle', a).text().trim() > $('a.user-details-toggle', b).text().trim() ? 1 : -1;
                });
            });
            // Pre-fetch user info if we have a session storage.
            if (jarnxmpp.Storage.storage !== null) {
                jarnxmpp.Presence.getUserInfo(user_id, function (data) {});
            }
        }
        online_count = jarnxmpp.Presence.onlineCount();
        if (online_count > 0) {
            $('#no-users-online').hide();
        } else {
            $('#no-users-online').show();
        }
        $('#online-count').text(online_count);
    };

    ob.positionNewChat =  function ($chat) {
        var open_chats = 0,
            offset;
        for (var i=0; i<this.chats.length; i++) {
            if ($("#"+helpers.hash(this.chats[i])).is(':visible')) {
                open_chats++;
            }
        }
        if (open_chats === 0) {
            $chat.animate({'right':'15px'});
        } 
        else {
            offset = (open_chats)*(this.chatbox_width+7)+15;
            $chat.animate({'right': (offset+'px')});
        }
    };

    ob.handleChatEvents =  function (chat_id) {
        var chat_area = $("#"+chat_id+" .chat-textarea"),
            chat_type = chat_id.split('_')[0],
            that = this;

        that.chat_focus[chat_id] = false;
        chat_area.blur(function () {
            that.chat_focus[chat_id] = false;
            chat_area.removeClass('chat-textarea-'+chat_type+'-selected');
        }).focus(function (){
            that.chat_focus[chat_id] = true;
            chat_area.addClass('chat-textarea-'+chat_type+'-selected');
        });
        var chatbox = $("#"+chat_id);
        chatbox.click(function () {
            if (chatbox.find('.chat-content').is(':visible')) {
                chatbox.find('.chat-textarea').focus();
            }
        });
    };

    ob.createChatbox = function (jid, callback) {
        var path = this.sanitizePath('/@@render_chat_box'),
            chat_id = helpers.hash(jid),
            that = this;

        $.ajax({
            url: path,
            cache: false,
            async: false,
            data: {
                chat_id: 'chatbox_'+jid,
                box_id: chat_id,
                jid: jid,
                tzoffset: -(new Date().getTimezoneOffset())
            },
            error: function (XMLHttpRequest, textStatus, errorThrown) {
                console.log(textStatus);
                console.log(errorThrown);
                return;
            },
            success: function(data) {
                var chat_id = $(data).attr('id');
                var $chat = $('body').append(data).find('#'+chat_id);
                $chat.find('.chat-message .time').each(function () {
                    var jthis = $(this);
                    var time = jthis.text().split(':');
                    var hour = time[0];
                    var minutes = time[1];
                    var date = new Date();
                    date.setHours(hour - date.getTimezoneOffset() / 60);
                    date.setMinutes(minutes);
                    jthis.replaceWith(date.toLocaleTimeString().substring(0,5));
                });
                callback($chat);
            }
        });
    };

    ob.prepNewChat = function (chat, jid) {
        // Some operations that need to be applied on a chatbox
        // after it has been created.
        var chat_content,
            value;
        if (jid === 'online-users-container') {
            // Make sure the xmpp status is correctly set on the control box
            value = xmppchat.Storage.get(xmppchat.username+'-xmpp-status') || 'online';
            $(chat).find('#select-xmpp-status').val(value);
        } else {
            chat_content = $(chat).find('.chat-content');
            $(chat).find(".chat-textarea").focus();
            if (chat_content.length > 0) {
                chat_content.scrollTop(chat_content[0].scrollHeight);
            }
        }

        if (!(jid in helpers.oc(this.chats))) {
            this.chats.push(jid);
        }
        this.addChatToCookie(jid);
    };

    ob.getChatbox =  function (jid, callback) {
        // Get a chatbox. Either it exists, then just ensure 
        // that it's visible and return it. Otherwise, create it.
        //
        // This method can be deferred.
        // http://www.erichynds.com/jquery/using-deferreds-in-jquery/
        var chat_content, 
            chat_id = helpers.hash(jid),
            $chat = $("#"+chat_id),
            that = this,
            dfd = $.Deferred();

        if (callback === undefined) {
            callback = function () {};
        }
        if ($chat.length > 0) {
            if ($chat.is(':visible')) {
                callback($chat);
                dfd.resolve();
            } else {
                // The chatbox exists, merely hidden
                $chat.show('fast', function () {
                    that.prepNewChat(this, jid);
                    that.reorderChats();
                    callback(this);
                    dfd.resolve();
                });
            }
        } else {
             this.createChatbox(jid, function ($chat) {
                // that.retrieveCollections();
                that.positionNewChat($chat);
                $chat.show('fast', function () {
                    that.prepNewChat(this, jid);
                    that.handleChatEvents(chat_id);
                    callback(this);
                    dfd.resolve();
                });
            });
        }
        return dfd.promise();
    };

    ob.reorderChats =  function () {
        var index = 0,
            chat_id,
            offset,
            $chat;

        if ('online-users-container' in helpers.oc(this.chats)) {
            index = 1;
            $chat = $("#"+helpers.hash(helpers.oc(this.chats)['online-users-container']));
            if ($chat.is(':visible')) {
                $chat.animate({'right': '15px'});
            }
        }

        for (var i=0; i < this.chats.length; i++) {
            chat_id = this.chats[i];
            if (chat_id === 'online-users-container') {
                continue;
            }
            $chat = $("#"+helpers.hash(this.chats[i]));
            if ($chat.is(':visible')) {
                if (index === 0) {
                    $chat.animate({'right': '15px'});
                } 
                else {
                    offset = (index)*(this.chatbox_width+7)+15;
                    $chat.animate({'right': offset +'px'});
                }
                index++;
            }
        }
    };

    ob.addChatToCookie = function (jid) {
        var cookie = jQuery.cookie('chats-open-'+xmppchat.username),
            new_cookie,
            open_chats = [];

        if (cookie) {
            open_chats = cookie.split('|');
        }
        if (!(jid in helpers.oc(open_chats))) {
            // Update the cookie if this new chat is not yet in it.
            open_chats.push(jid);
            new_cookie = open_chats.join('|');
            jQuery.cookie('chats-open-'+xmppchat.username, new_cookie, {path: '/'});
            console.log('updated cookie = ' + new_cookie + '\n');
        }
    };

    ob.removeChatFromCookie = function (jid) {
        var cookie = jQuery.cookie('chats-open-'+xmppchat.username),
            open_chats = [],
            new_chats = [];

        if (cookie) {
            open_chats = cookie.split('|');
        }
        for (var i=0; i < open_chats.length; i++) {
            if (open_chats[i] != jid) {
                new_chats.push(open_chats[i]);
            }
        }
        if (new_chats.length) {
            jQuery.cookie('chats-open-'+xmppchat.username, new_chats.join('|'), {path: '/'});
        }
        else {
            jQuery.cookie('chats-open-'+xmppchat.username, null, {path: '/'});
        }
    };

    ob.addMessageToChatbox =  function (event) {
        /* XXX: event.mtype should be 'xhtml' for XHTML-IM messages, 
            but I only seem to get 'text'. 

            XXX: Some messages might be delayed, we must get the time from the event.
        */
        var user_id = Strophe.getNodeFromJid(event.from),
            jid = Strophe.getBareJidFromJid(event.from),
            text = event.body.replace(/<br \/>/g, ""),
            that = this;

        xmppchat.Presence.getUserInfo(user_id, function (data) {
            that.getChatbox(jid, function (chat) {
                var chat_content = $(chat).find(".chat-content"),
                    now = new Date(),
                    time = now.toLocaleTimeString().substring(0,5),
                    div = $('<div class="chat-message"></div>');

                if (event.delayed) {
                    div.addClass('delayed');
                }
                if (user_id == that.username) {
                    message_html = div.append( 
                                        '<span class="chat-message-me">'+time+' me:&nbsp;&nbsp;</span>' + 
                                        '<span class="chat-message-content">'+text+'</span>'
                                        );
                } else {
                    message_html = div.append( 
                                        '<span class="chat-message-them">'+time+' '+data.fullname+':&nbsp;&nbsp;</span>' + 
                                        '<span class="chat-message-content">'+text+'</span>'
                                        );
                }
                chat_content.append(message_html);
                chat_content.scrollTop(chat_content[0].scrollHeight);
                xmppchat.UI.msg_counter += 1;
                xmppchat.UI.updateMsgCounter();
            });
        });
    };

    ob.closeChat = function (jid) {
        var chat_id = helpers.hash(jid),
            that = this;
        jQuery('#'+chat_id).hide('fast', function () {
            var idx = that.chats.indexOf(jid);
            if (idx !== undefined) {
                that.chats.splice(idx, 1);
            }
            that.removeChatFromCookie(jid);
            that.reorderChats();
        });
    };

    ob.restoreOpenChats = function () {
        /* Check the open-chats cookie and re-open all the chatboxes it mentions.
         * We need to wait for current chatbox creation to finish before we create the
         * next, so we use a task buffer to make sure the next task is only
         * executed after the previous is done.
        */
        var cookie = jQuery.cookie('chats-open-'+xmppchat.username),
            open_chats = [];

        jQuery.cookie('chats-open-'+xmppchat.username, null, {path: '/'});
        if (cookie) {
            open_chats = cookie.split('|');
            // FIXME: Change this so that the online contacts box is always created first.
            for (var i=0; i<open_chats.length; i++) {
                xmppchat.Taskbuffer.tasks.push({'that': this, 'method':this.getChatbox, 'parameters':[open_chats[i]]});
            }
            xmppchat.Taskbuffer.handleTasks();
        }
    };

    ob.keyPressed = function (ev, textarea) {
        if(ev.keyCode == 13 && !ev.shiftKey) {
            var $textarea = jQuery(textarea),
                message = $textarea.val(),
                jid = $textarea.attr('data-recipient'),
                form = $textarea.parent(),
                now, 
                minutes, 
                time, 
                chat_content;

            message = message.replace(/^\s+|\s+jQuery/g,"");
            $textarea.val('').focus();
            if (message !== '') {
                xmppchat.Messages.sendMessage(jid, message, function () {

                    message = message.replace(/</g,"&lt;").replace(/>/g,"&gt;").replace(/\"/g,"&quot;");
                    list = message.match(/\b(http:\/\/www\.\S+\.\w+|www\.\S+\.\w+|http:\/\/(?=[^w]){3}\S+[\.:]\S+)[^ ]+\b/g);
                    if (list) {
                        for (i = 0; i < list.length; i++) {
                            message = message.replace( list[i], "<a target='_blank' href='" + escape( list[i] ) + "'>"+ list[i] + "</a>" );
                        }
                    }
                    now = new Date();
                    minutes = now.getMinutes().toString();
                    if (minutes.length==1) {minutes = '0'+minutes;}
                    time = now.toLocaleTimeString().substring(0,5);
                    chat_content = jQuery('#'+helpers.hash(jid)+' .chat-content');
                    chat_content.append(
                        '<div class="chat-message">' + 
                            '<span class="chat-message-me">'+time+' me:&nbsp;&nbsp;</span>' + 
                            '<span class="chat-message-content">'+message+'</span>' + 
                        '</div>');
                    chat_content.scrollTop(chat_content[0].scrollHeight);
                });
            }
        }
    };
    return ob;
})(xmppchat.UI || {}, jQuery, console || {log: function(){}} );


// Event handlers
// --------------
$(document).ready(function () {
    var chatdata = jQuery('span#babble-client-chatdata'),
        $toggle = $('a#toggle-online-users');

    xmppchat.username = chatdata.attr('username');
    xmppchat.base_url = chatdata.attr('base_url');

    $toggle.unbind('click');
    $toggle.bind('click', function (e) {
        e.preventDefault();
        if ($("div#online-users-container").is(':visible')) {
            xmppchat.UI.closeChat('online-users-container');
        } else {
            xmppchat.UI.getChatbox('online-users-container');
        }
    });

    $(document).unbind('jarnxmpp.message');
    $(document).bind('jarnxmpp.message',  function (event) {
        xmppchat.UI.addMessageToChatbox(event);
    });

    $(document).bind('xmppchat.send_presence', function (event, jid, type) {
        xmppchat.connection.send($pres({'type':type}));
    });

    $(document).unbind('jarnxmpp.presence');
    $(document).bind('jarnxmpp.presence', function (event, jid, status, presence) {
        xmppchat.UI.updateOnPresence(jid, status, presence);
    });


    $(document).unbind('jarnxmpp.connected');
    $(document).bind('jarnxmpp.connected', function () {
        // Logging
        xmppchat.connection.rawInput = xmppchat.rawInput;
        xmppchat.connection.rawOutput = xmppchat.rawOutput;
        // Messages
        xmppchat.connection.addHandler(xmppchat.Messages.messageReceived, null, 'message', 'chat');
        //Roster
        xmppchat.connection.addHandler(xmppchat.Roster.rosterResult, Strophe.NS.ROSTER, 'iq', 'result');
        xmppchat.connection.addHandler(xmppchat.Roster.rosterSuggestedItem, 'http://jabber.org/protocol/rosterx', 'message', null);
        // Presence
        xmppchat.connection.addHandler(xmppchat.Presence.presenceReceived, null, 'presence', null);

        xmppchat.UI.restoreOpenChats();
        xmppchat.Presence.sendPresence();
    });

    $('a.user-details-toggle').live('click', function (e) {
        var $field = $('[name="message"]:input', $(this).parent()[0]),
            jid = $field.attr('data-recipient');
        e.preventDefault();
        xmppchat.UI.getChatbox(jid);
    });

    $('textarea.chat-textarea').live('keypress', function (ev) {
        xmppchat.UI.keyPressed(ev, this);
    });

    $('a.close-chatbox-button').live('click', function (ev) {
        var jid = $(ev.target).parent().parent().attr('data-recipient');
        xmppchat.UI.closeChat(jid);
    }); 

    $('ul.tabs').tabs('div.panes > div');
    $('select#select-xmpp-status').bind('change', function (ev) {
        var jid = xmppchat.connection.jid,
            value = ev.target.value;

        xmppchat.Presence.sendPresence(value);
        xmppchat.Storage.set(xmppchat.username+'-xmpp-status', value);
    });
});