export default class ChannelController{

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

		/* (1) Set default active channel */
		this.current = null;

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

		/* (3) Initialize channel data buffer */
		this.buffer = {};

	}


	/* (2) Channel navigation
	*
	* @channel_id<int>					Channel id (NULL uses get())
	*
	* @return status<boolean>			Whether the navigation has been successful
	*
	---------------------------------------------------------*/
	nav(channel_id=null){

		if( channel_id == -2 )
			return gs.get.popup.show('channel.create');

		console.log(`channel.nav(${channel_id})`);

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

		/* (2) Try to load channel data */
		if( !this.load(channel.id) )
			return false;

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

		/* (4) Load rooms */
		gs.get.room.dump(channel.room);

		/* (5) Default open first 'text' room */
		gs.get.room.nav('text', gs.get.room.text.list[0].id);

		/* (6) Update active element */
		this.current = channel.id;

		/* (7) 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
	*
	---------------------------------------------------------*/
	dump(channels){
		console.log(`channel.dump([${channels instanceof Array?channels.length:0}])`);

		/* (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
	*
	---------------------------------------------------------*/
	get(channel_id=null){
		// console.log(`channel.get(${channel_id})`);

		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];

	}


	/* (5) Fetch channel data
	*
	* @channel_id<int>					Channel ID
	*
	* @return fetched<bool>				Whether channel data have been fetched
	*
	---------------------------------------------------------*/
	load(channel_id=null){
		console.log(`channel.load(${channel_id})`);

		/* (1) Exit if invalid @channel_id */
		if( isNaN(channel_id) )
			return false;

		/* (2) Call API to get data */
		setTimeout(() => {

			this.buffer = require('../mockup/api-channel-init.json');

		}, 500);

		return true;

	}

}