export default class ContentController{

	/* (1) Construct default attributes
	*
	---------------------------------------------------------*/

	constructor(){}

	/* (2) Channel bindings
	*
	---------------------------------------------------------*/
	get cid(){  return gs.get.channel.current; }

	get cbuf(){ return gs.get.channel._buffer; }


	/* (3) Room ID binding
	*
	---------------------------------------------------------*/
	get rid(){ return gs.get.room.text.current; }
	get rbuf(){ return gs.get.room._buffer.text; }

	get messages(){ return this.rbuf.messages; }
	get members(){  return this.rbuf.members;  }

	// current user data
	get uid(){  return gs.get.auth.user.uid;  }
	get ubuf(){  return gs.get.auth.user;  }


	/* (5) User getter
	*
	* @user_id<int>					User id
	*
	* @return user<array>			User data
	*
	---------------------------------------------------------*/
	user(user_id=null){

		/* (1) Error: if invalid user_id */
		if( isNaN(user_id) )
			return {};

		/* (2) Error: unknown user */
		if( this.cbuf.users == null || this.cbuf.users.length < 1 )
			return {};

		/* (3) return user data */
		for( let u of this.cbuf.users )
			if( u.uid === user_id )
				return u;

		/* (4) Error */
		return {};

	}


	/* (6) Change username
	*
	* @username<String>				New username
	---------------------------------------------------------*/
	change_username(username=null){

		/* (1) Error: if invalid user_id */
		if( typeof username !== 'string' )
			return false;

		/* (2) Error: unknown user */
		if( this.uid == null  )
			return false;

		/* (3) Call api UPDATE */
		api.call(`PUT /user/${this.uid}`, { username: username }, function(rs){

			gs.get.popup.hide();

			// manage error
			if( rs.error !== 0 )
				return;

			// update global username
			let tmp_user      = auth.user;
			tmp_user.username = username;
			auth.user         = tmp_user;

			// update username in channel
			for( let u in this.cbuf.users )
				if( this.cbuf.users[u].uid == this.uid )
					this.cbuf.users[u].username = username;

		}.bind(this), auth.token);

		/* (4) Error */
		return true;

	}


	/* (7) Change password
	*
	* @password<String>				New password
	*
	---------------------------------------------------------*/
	change_password(password=null){

		/* (1) Error: if invalid user_id */
		if( typeof password !== 'string' )
			return false;

		/* (2) Error: unknown user */
		if( this.uid == null  )
			return false;

		/* (3) Call api UPDATE */
		api.call(`PUT /user/${this.uid}`, { password: password }, () => gs.get.popup.hide(), auth.token);

		/* (4) Error */
		return true;

	}


	/* (8) Send message
	*
	---------------------------------------------------------*/
	send_message(_msg=null){

		/* (1) Manage invalid _msg */
		if( typeof _msg !== 'string' || _msg.length <= 0 )
			return true;

		/* (2) Send message */
		window.csock.send({ buffer: {
			rid: this.rid,
			mid: null,
			message: _msg
		}});

		return true;

	}


	/* (9) MAIN UPDATER
	*
	---------------------------------------------------------*/
	manage_update(_dat){

		/* (1) Manage rooms
		---------------------------------------------------------*/
		/* (1) Extract ids */
		let room_ids = Object.keys(_dat.room).map( (v) => parseInt(v) );
		let current_list = gs.get.room.text.list;

		/* (2) Manage DELETED rooms */
		for( let ri in current_list ){

			// if existing room is not in received keys -> has been deleted
			let to_remove = room_ids.indexOf(current_list[ri].id) < 0;

			// delete room from interface
			( to_remove ) && current_list.splice(ri,1);

		}


		/* (3) Manage UPDATE + CREATE rooms */
		for( let ri of room_ids ){

			// 1. Extract room data
			let room = _dat.room[ri];

			// 2. if room data is null -> ignore
			if( room === null )
				continue;

			// 3. Check whether room already exists in interface
			let existing_index = -1;

			for( let r in current_list )
				if( current_list[r].id === ri ){ existing_index = r; break; }


			// 4. Create room
			if( existing_index < 0 ){

				gs.get.room.dump([{
					rid:      ri,
					name:     room.name,
					messages: room.messages,
					members:  room.members,
					type:     'text'
				}], true);

				continue;
			}

			// 5. Update room
			current_list[existing_index].name    = room.name;
			current_list[existing_index].members = room.members;

			// 6. Push new messages
			for( let m of room.messages ){

				current_list[existing_index].messages.push({
					uid: m.uid,
					mid: m.mid,
					msg: m.content,
					ts:  m.ts
				});

			}

			/* (7) Notification API -> if not current channel */
			if( room.messages.length > 0 && ri !== gs.get.content.rid ){

				let title = `Room #${room.name}`;
				let body  = `${room.messages.length} new messages`;
				new Notification(title, { body: body });

			}

		}

	}




}