//TODO add underscore as requirement

    "dojo/cookie",

    "coweb/main",

    "rcolor",

    "underscore"

], function(dojo, cookie, coweb, RColor, underscore) {

    var _ = underscore;

    	var that = this;

    	sess.prepare().then(function(data) {

    		console.log("Prepare ok : ", data);

    	});

    	this.collab.subscribeSync("_roster", this, "onRemoteRosterChange");

        this.collab.subscribeReady(this, 'onLocalJoin');

        this.collab.subscribeSiteJoin(this, 'onRemoteJoin');

        this.collab.subscribeSiteLeave(this, 'onRemoteLeave');

    };

    proto.onLocalJoin = function(params) {

    	console.log("Local join", params);

    };

    proto.onRemoteJoin = function(params) {

    	console.log("Remote join", params);

    	// do nothing

    };

    proto.onRemoteLeave = function(params) {

    	console.log("Remote leave", params);

    	// remove remote site from current_user_list

    	if(typeof this.renkan === "undefined" || this.renkan == null || typeof this.renkan.current_user_list === "undefined" || this.renkan.current_user_list == null) {

    		return;

    	}

			_project_id : obj.get("project").get("_id"),

			_user_id : (this.project.current_user!=null)?this.project.current_user.id:null

    	    _project_id : obj.get("project").id,

    	    _user_id : (this.project.current_user!=null)?this.project.current_user.id:null

	    	    _project_id : obj.get("project").id,

	    	    _user_id : (this.project.current_user!=null)?this.project.current_user.id:null

    /**

     * Called when an abject is changed

     * 

     */

    proto.objectChange = function(event, model, collection, options) {

		console.log("project change all ", event, model, collection, options);

		// check that current user is in user list of the project

		if(this.project == null || this.project.current_user == null) {

			return;

		}

		var current_user = this.project.current_user;

		if(this.project.get("users").get(current_user.id) == null) {

			var props = current_user.toJSON();

			this.project.addUser(props);

		}

	};

    proto.setObjects = function(renkan) {

    	console.log(cookie("BAYEUX_BROWSER"));

    	var project = renkan.project;

    	this.setProject(project);

    	this.setRenkan(renkan);

    	this.initCollab("renkan_" + project.id);

    	this.setUser(renkan);

    };

    proto.setRenkan = function(renkan) {

    	console.log("Set Renkan");

    	var that = this;

    	renkan.current_user_list.bind("add", function(obj, c, options) {

    		that.addObjectBind("_roster", obj, c, options);

    	});

    	renkan.current_user_list.bind("remove", function(obj, c, options) {

    		that.removeObjectBind("_roster", obj, c, options);

    	});

    	renkan.current_user_list.bind("change", function(obj, options) {

    		that.updateObjectBind("_roster", obj, options);

    	});

    	renkan.current_user_list.bind("change", function(obj, options) {

    		console.log("update roster",obj, options);

    		// get user in project

    		project = obj.get("project");

    		if(project == null) {

    			console.log("null project return");

    			return;

    		}

    		user = project.get("users").get(obj.id);

    		if(user == null) {

    			console.log("user " + obj.id + " not in project. return");

    			return;

    		}

    		for(att in obj.changed) {

    			new_val = obj.changed[att];

    			if(user.get("att") != new_val) {

    				user.set(att, new_val);

    			}

    		}

    	});

    	this.renkan = renkan;

    };

    proto.setUser = function(renkan) {

    	console.log("set user : " + cookie("BAYEUX_BROWSER"));

    	if(typeof renkan === "undefined" || typeof renkan.project === "undefined" || renkan.project == null) {

    		return;

    	}

    	var user_id = cookie("BAYEUX_BROWSER");

    	var project = renkan.project;

    	var puser = project.get("users").get(user_id);

    	var puser_def = null;

    	if(puser == null) {

    		color = new RColor();

    		puser_def = {

    		    id: user_id,

                title: "anonymous",

                project: project,

                color: color.get(true, 0.3, 0.99)

            };

    	}

    	else {

    		puser_def = puser.toJSON();

    		puser_def.project = project;

    	}

    	puser = renkan.current_user_list.push(puser_def);

    	project.current_user = puser;

    	renkan.current_user = puser.id;

    	var that = this;

    	project.once("all", function(event, model, collection, options){

    		that.objectChange(event, model, collection, options);

    	});

    	project.get("nodes").once("all", function(event, model, collection, options){

    		that.objectChange(event, model, collection, options);

    	});

    	project.get("edges").once("all", function(event, model, collection, options){

    		that.objectChange(event, model, collection, options);

    	});

    };

    	var projectFields = ["title", "description", "uri"];