export default class ContentController{

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

		/* (1) Websocket re-connection policy */
		this.attempt = {
			max:     5,
			count:   1,
			_default_timeout: 500, // in ms
			get timeout(){

				// return timeout + increment it for next time
				return (this._default_timeout/2) * Math.pow(2, this.count++);
			},
			// same without incrementing (for LOGS)
			get raw_timeout(){ return (this._default_timeout/2) * Math.pow(2, this.count); }
		};

		/* (2) Manage updates in connection status (ONLINE - OFFLINE) */
		window.addEventListener('online',  function(){
			DEBUG_MOD && console.log(`[NETWORK] online`);

			DEBUG_MOD && console.log(` + Try to connect`);
			// wait 500ms for net to be really online
			setTimeout( this.ws_connect.bind(this), 500);

		}.bind(this));

		window.addEventListener('offline', function(){

			DEBUG_MOD && console.log(`[NETWORK] offline`);
			gs.get.connection = 0; // connection status bar

			DEBUG_MOD && console.log(` + stop resync-strategy`);
			csock.onclose = function(){}; // stop propagating recursive ws_connect()

		});



	}

	/* (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;

		}.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) Websocket connection / reconnection
	*
	---------------------------------------------------------*/
	ws_connect(){

		gs.get.connection = 1;

		// 1. Close websocket if exists
		if( window.csock instanceof wscd ){
			csock.onclose = function(){}; // stop propagating recursive ws_connect()
			csock.close();
		}

		// 2. Create new connection
		window.csock = new wscd(`wss://ws.douscord.xdrm.io/channel/${this.cid}`, { token: auth.token });

		// 3. Bind events
		csock.onconnected = () => {

			DEBUG_MOD && console.log('[WS] connected');
			DEBUG_MOD && console.log('[WS] pop stack', csock.stack.map( v => v.buffer ) );

			// show connection status
			gs.get.connection = 2;

			// reset attempt count
			gs.get.content.attempt.count = 1;

			setTimeout( () => { gs.get.connection = null; }, 1500);
		};
		csock.onreceive   = gs.get.content.ws_handler.bind({ event: 'receive', class: this });
		csock.onclose     = gs.get.content.ws_handler.bind({ event: 'close',   class: this });

		// 4. Start communication
		csock.bind();

		// 5. Send RID (useful when reconnecting, but a doublon at first connection)
		csock.send({ buffer: { rid: gs.get.room.text.current } });

		DEBUG_MOD && console.log('[WS] connecting');
		DEBUG_MOD && console.log(` + start resync-strategy`);
		DEBUG_MOD && console.log(`[WS] push stack`, { rid: gs.get.room.text.current });

	}


	/* (10) Websocket connection manager
	*
	* @this.event<String>				Event type :
	*										'close'   -> socket closed
	*										'receive' -> received message
	*
	---------------------------------------------------------*/
	ws_handler(_response){

		DEBUG_MOD && console.groupCollapsed(`[WS] on${this.event}`);

		/* (1) Manage error */
		if( this.event === null )
			return;


		/* (2) CLOSE event -> reconnect
		---------------------------------------------------------*/
		if( this.event === 'close' ){

			// 1. update connection status bar
			gs.get.connection = 0;

			// 2. Do nothing if offline (online trigger will do the job when online again)
			if( !navigator.onLine ){
				DEBUG_MOD && console.log(' + network offline, wait for online trigger');
				return DEBUG_MOD && console.groupEnd();
			}


			// 3. if max attempt exceeded -> logout user
			if( this.class.attempt.count > this.class.attempt.max ){
				DEBUG_MOD && console.log(' + max resync offset reached');
				DEBUG_MOD && console.log(' + logout');
				auth.token = null;
				gs.get.refresh();
				return DEBUG_MOD && console.groupEnd();
			}

			// 4. Try to reconnect
			DEBUG_MOD && console.log(` + resync (${this.class.attempt.count}/${this.class.attempt.max}) in ${this.class.attempt.raw_timeout}ms`);
			setTimeout(this.class.ws_connect.bind(this.class), this.class.attempt.timeout);
			return DEBUG_MOD && console.groupEnd();
		}


		/* (3) RECEIVE event
		---------------------------------------------------------*/
		if( this.event === 'receive' ){

			/* (1) Communication error -> reconnect in 500ms */
			if( typeof _response !== 'object' ){
				DEBUG_MOD && console.log(` + invalid response: resync in 500ms`);
				setTimeout(this.class.ws_connect.bind(this.class), 500);
				return DEBUG_MOD && console.groupEnd();
			}

			/* (2) If message update -> update interface model */
			this.class.ws_to_model(_response);
			return DEBUG_MOD && console.groupEnd();

		}

	}



	/* (11) MAIN UPDATER
	*
	---------------------------------------------------------*/
	ws_to_model(_dat){


		DEBUG_MOD && console.group(`room`);

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

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

			for( let ri in current_list[t].list ){

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

				// delete room from interface
				DEBUG_MOD && to_remove && console.log(` + #${current_list[t].list[ri].id} dropped`);
				( to_remove ) && current_list[t].list.splice(ri,1);

			}

		}


		/* (2) Manage rooms CREATE + UPDATE
		---------------------------------------------------------*/
		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. Manage room 'type'
			room.type = (room.type === 0) ? 'text' : 'voice';

			// 4. Check whether room already exists in interface
			let existing_index = -1;


			main_loop: for( let t in current_list ){

				for( let r in current_list[t].list ){

					if( current_list[t].list[r].id === ri ){
						existing_index = r;
						break main_loop;
					}

				}

			}


			// 5. Create room
			if( existing_index < 0  ){

				DEBUG_MOD && console.log(` + #${ri} [${room.type}] room created`);
				gs.get.room.dump([{
					rid:      ri,
					name:     room.name,
					messages: room.messages,
					members:  room.members,
					type:     room.type
				}], true);

				continue;
			}

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

			// 6. We are done if VOICE room
			if( room.type === 'voice' )
				continue;


			// 7. Push new messages
			DEBUG_MOD && ( room.messages.length > 0 ) && console.log(` + #${ri} has ${room.messages.length} new message(s)`);

			for( let m of room.messages ){

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

			}

			// 8. 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 });

			}
			// 9. If not self on current channel -> notification sound
			if( room.messages.length > 0 && room.messages[0].uid !== auth.user.uid && ri === gs.get.content.rid )
				AudioManager.pop();


		}

		DEBUG_MOD && console.groupEnd();




		DEBUG_MOD && console.group(`channel`);
		DEBUG_MOD && ( _dat.channels.add.length > 0 ) && console.log(` + ${_dat.channels.add.length} new`);
		DEBUG_MOD && ( _dat.channels.rem.length > 0 ) && console.log(` + ${_dat.channels.rem.length} dropped`);
		DEBUG_MOD && ( _dat.channels.upd.length > 0 ) && console.log(` + ${_dat.channels.upd.length} updated`);

		/* (3) Manage channels DELETE
		---------------------------------------------------------*/
		for( let c of _dat.channels.rem ){

			for( let ci in gs.get.channel.list ){

				// 1. Local copy channel data
				let channel = gs.get.channel.list[ci];

				// 2. If id matches -> REMOVE
				if( channel.id === c.id ){

					// 2.1. If remove CURRENT channel -> nav to channel 1
					if( channel.id === gs.get.content.cid )
						gs.get.channel.nav(1);

					// 2.2. Delete channel
					DEBUG_MOD && console.log(` + #${channel.id} dropped`);
					gs.get.channel.list.splice(ci, 1);
				}

			}

		}



		/* (4) Manage channels CREATE
		---------------------------------------------------------*/
		for( let c of _dat.channels.add ){

			DEBUG_MOD && console.log(` + #${c.id} [/${c.link}] created`);

			gs.get.channel.dump([{
				id:    parseInt(c.id),
				label: c.name,
				link:  c.link
			}], true);

		}


		/* (5) Manage channels UPDATE
		---------------------------------------------------------*/
		for( let c of _dat.channels.upd ){

			for( let ci in gs.get.channel.list ){

				// 1. Local copy channel data
				let channel = gs.get.channel.list[ci];

				// 2. If id matches -> UPDATE
				if( channel.id === c.id ){

					DEBUG_MOD && console.log(` + #${c.id} updated`);

					gs.get.channel.list[ci].label = c.name;
					gs.get.channel.list[ci].link  = c.link;

				}

			}

		}


		DEBUG_MOD && console.groupEnd();
		DEBUG_MOD && console.group('users');




		let userset = gs.get.content.cbuf.users;


		/* (6) Manage users DELETE
		---------------------------------------------------------*/
		for( let u of _dat.users.rem ){

			for( let ui in userset ){

				// 1. Local copy user data
				let user = userset[ui];

				// 2. If id matches -> REMOVE
				if( user.uid === u.id ){
					DEBUG_MOD && console.log(` + '${user.username}' dropped`);
					userset.splice(ui, 1);
				}

			}

		}



		/* (7) Manage users CREATE
		---------------------------------------------------------*/
		for( let u of _dat.users.add ){

			DEBUG_MOD && console.log(` + '${u.name}' created`);
			userset.push({
				uid:      parseInt(u.id),
				username: u.name
			});

		}


		/* (8) Manage users UPDATE
		---------------------------------------------------------*/
		for( let u of _dat.users.upd ){

			for( let ui in userset ){

				// 1. Local copy user data
				let user = userset[ui];

				// 2. If id matches -> UPDATE
				if( user.uid === u.id ){
					DEBUG_MOD && console.log(` + '${user.username}' renamed '${u.name}'`);
					userset[ui].username = u.name;
				}

			}

		}

		DEBUG_MOD && console.groupEnd();

	}








}