/* (1) Initialisation
---------------------------------------------------------*/
/* (1) Init @channel object */
gs.set('channel', {});

/* (2) Set default active channel */
gs.get.channel.current = null;

/* (3) Initialize list */
gs.get.channel.list = [
	{ id: -1, link: 'me', label: 'My data', sub: '0 online', icon: 'group', local: []         },
	{ id: -2, link: null, label: 'add',     sub: null,       icon: 'add',   local: [], add: 1 }
];

/* (4) Initialize vue-router channel navigation */
gs.get.channel.nav  = function(){};

/* (5) Initialize adding fetched channel */
gs.get.channel.dump = function(){};

/* (6) Initialize accessor for channel data */
gs.get.channel.get  = function(){};



/* (2) Channel navigation
---------------------------------------------------------*/
gs.get.channel.nav = function(channel_id=null){

	/* (1) Get channel data */
	var channel = this.get(channel_id);

	/* (3) Abort if same channel */
	if( gs.get.router.history.current.params.link === channel.link )
		return false;

	/* (3) Navigate vue-router */
	gs.get.router.push(`/channel/${channel.link}`);

	/* (4) Update active element */
	this.current = channel.id;

	/* (5) Log channel */
	console.log(`[channel.current] ${channel.link} (${channel.label})`);

	return true;
};


/* (3) Dump/Update channel data
*
* @channels<array>					Channels data
*
* @return udpated<boolean>			Whether channels have been updated
*
---------------------------------------------------------*/
gs.get.channel.dump = function(channels){

	/* (1) Check @channels type */
	if( !(channels instanceof Array) )
		return false;

	/* (2) Store LAST item */
	let last_item = this.list.pop();

	/* (3) Clear list (except FIRST) */
	this.list.splice(1);

	/* (4) Apply new channels */
	for(let c of channels)
		this.list.push(c);

	/* (5) Restore LAST */
	this.list.push(last_item);

	return true;

};


/* (4) Get channel data
*
* @channel_id<int>					Channel ID
*									NULL: current channel || from URL (and set current)
*
* @return channel<array>			Channel data
*
---------------------------------------------------------*/
gs.get.channel.get = function(channel_id=null){

	if( channel_id === null ){

		/* (1) Get @current channel
		---------------------------------------------------------*/
		/* (1) If @current is set */
		if( !isNaN(this.current) ){

			/* (2) Return matching id in list */
			for( let c of this.list ){

				if( c.id === this.current )
					return c; // exit point

			}

		}


		/* (2) Get from URL
		---------------------------------------------------------*/
		/* (1) If vue-router has @link param */
		if( gs.get.router.history.current.params.link ){

			/* (2) Extract @link */
			let link = gs.get.router.history.current.params.link;

			/* (3) Return matching link in list */
			for( let c of this.list ){

				if( c.link === link ){

					this.current = c.id; // set @current
					return c;           // exit point

				}

			}

		}

	}


	/* (3) Get channel data
	---------------------------------------------------------*/
	/* (1) Return channel matching id */
	for( let c of this.list )
		if( c.id === channel_id )
			return c; // exit point

	/* (2) Return default: if ID not found */
	this.current = this.list[0].id;
	return this.list[0];

}





/* (N) Manage active channel from URL
---------------------------------------------------------*/
/* (1) Set current active channel item from URL */
// gs.get.channel.nav();