/*
 * BGPlay.js #9660
 * A web-based service for the visualization of the Internet routing
 *
 * Copyright (c) 2012 Roma Tre University and RIPE NCC
 *
 * See the file LICENSE.txt for copying permission.
 */
 
/**
 * @class Source
 * @module model
 */
var Source=Backbone.Model.extend({
    defaults:{
        type:"source"
    },
 
    /**
     * The initialization method of this object.
     * @method initialize
     * @param {Map} A map of parameters
     */
    initialize:function(){
        this.attributes.events={};
        this.attributes.cur_events={};
        this.environment=this.attributes.environment;
        this.bgplay=this.environment.bgplay;
        this.bgplay.on("change:cur_instant",function(){
            this.updateState();
        },this);
    },
 
    /**
     * The validation method of this object.
     * This method is used to check the initialization parameters.
     * @method validate
     * @param {Map} A map of parameters
     * @return {Array} An array of {String} errors
     */
    validate:function(attrs){
        var err=new Array();
        if(attrs.id==null)
            err.push("An id is required!");
 
        if (err.length>0)
            return err;
    },
 
    /**
     * This method updates the state of this source, it is triggered at each change of the current instant defined by Bgplay.
     * The objective of this method is to find the current event in which the source is involved.
     * If the current event changes then this method triggers a "curEventChange" event (pub/sub) containing the current event.
     * If the current event is null then this method triggers a "curEventNull" event (pub/sub) containing the previous event.
     * @method updateState
     */
    updateState:function(){
        var oldEvent;
        var instant=this.bgplay.get("cur_instant");
 
        for (var cur_target in this.get("events")){
 
            var tree=this.get("events")[cur_target]; //TreeMap for the current target
            var cur_event_for_this_targets=tree.nearest(instant,false,true);
 
            oldEvent=this.get("cur_events")[cur_target];
            if (cur_event_for_this_targets!=null){
                if (oldEvent!=cur_event_for_this_targets || tree.compare(cur_event_for_this_targets.get("instant"), instant)==0){
                    this.trigger('curEventChange',cur_event_for_this_targets);
                }
            }else{
                this.trigger('curEventNull',oldEvent);
            }
            this.get("cur_events")[cur_target]=cur_event_for_this_targets;
        }
 
    },
 
    /**
     * Returns a string representing this object.
     * @method toString
     * @return {String} A string representing this object
     */
    toString:function(){
        var out="";
        switch (this.bgplay.get("type")){
            default:
                out=this.get("id")||"";
                break;
        }
        return out;
    },
 
    /**
     * Adds an event involving this source.
     * @method addEvent
     * @param {Object} An instance of Event
     */
    addEvent:function(event){
        var target=event.get("target");
        if (!this.get("events")[target.get("id")]){
            this.get("events")[target.get("id")]= new net.webrobotics.TreeMap(
                function(obj1,obj2){
                    if (obj1.getTimestamp()<obj2.getTimestamp() || (obj1.getTimestamp()==obj2.getTimestamp() && obj1.getId()<obj2.getId()))
                        return -1;
                    if (obj1.getTimestamp()>obj2.getTimestamp() || (obj1.getTimestamp()==obj2.getTimestamp() && obj1.getId()>obj2.getId()))
                        return 1;
                    if (obj1.getTimestamp()==obj2.getTimestamp() && obj1.getId()==obj2.getId())
                        return 0;
                },
                {allowDuplicateKeys:false,suppressDuplicateKeyAlerts:true}
            );
        }
        this.get("events")[target.get("id")].put(event.get("instant"),event);
    }
});
 
var Sources=Backbone.Collection.extend({
    model:Source
});