import React, { Component } from 'react';
import TorrentLine from './torrent'
import {List} from 'material-ui/List';
import Divider from 'material-ui/Divider';
import Subheader from 'material-ui/Subheader';
import Paper from 'material-ui/Paper';
import FlatButton from 'material-ui/FlatButton';
import RefreshIndicator from 'material-ui/RefreshIndicator';

export default class RecentTorrents extends Component {
  constructor() {
  	super()
  	this.torrents = [];
    this.torrentsAssoc = {};
  	this.displayQueue = [];
    this.displayQueueAssoc = {};
    this.maxQueueSize = 1000;
    this.maxDisplaySize = 10;
  	this.state = { 
      pause: false,
      searchingIndicator: false
   }
  }
  componentDidMount() {
  	window.torrentSocket.emit('recentTorrents', window.customLoader((data) => {
  		if(data) {
  			this.torrents = data;
  			//this.forceUpdate(); // вызывается через searchingIndicator
  		}

  		this.displayNewTorrent = () => {
        if(!this.displayNewTorrent) {
          return;
        }

	  		if(this.displayQueue.length == 0) {
          setTimeout(this.displayNewTorrent, 1000);
	  			return;
        }

        const speed = 850;

	  		if(this.state.pause) {
          setTimeout(this.displayNewTorrent, speed);
	  			return;
        }

	  		let torrent = this.displayQueue.shift();
	  		this.torrents.unshift(torrent);
        this.torrentsAssoc[torrent.hash] = torrent;
	  		if(this.torrents.length > this.maxDisplaySize) {
	  			let toDelete = this.torrents.pop()
          delete this.torrentsAssoc[toDelete.hash];
          delete this.displayQueueAssoc[toDelete.hash];
        }
        this.displayTorrentCounterValue = this.displayQueue.length;

	  		this.forceUpdate();
        setTimeout(this.displayNewTorrent, speed);
	  	}
      this.displayNewTorrent();

      this.displayTorrentCounterValue = 0;
      this.displayTorrentCounter = setInterval(() => {
        if(this.displayTorrentCounterValue != this.displayQueue.length) {
          this.displayTorrentCounterValue = this.displayQueue.length;
          this.forceUpdate();
        }
      }, 40);
  	}, () => {
      this.setState({
        searchingIndicator: true
      });
    }, () => {
      this.setState({
        searchingIndicator: false
      });
    }));
  	this.newTorrentFunc = (torrent) => {
      if(this.displayQueue.length < this.maxQueueSize) {
        this.displayQueue.push(torrent);
        this.displayQueueAssoc[torrent.hash] = torrent;
      }
  	};
  	window.torrentSocket.on('newTorrent', this.newTorrentFunc);
    
    this.tracketUpdate = (statistic) => {
      if(statistic.hash in this.displayQueueAssoc)
      {
        Object.assign(this.displayQueueAssoc[statistic.hash], statistic);
        if(statistic.hash in this.torrentsAssoc) {
          this.forceUpdate();
        }
      }
    }
    window.torrentSocket.on('trackerTorrentUpdate', this.tracketUpdate);
  }
  pauseAndContinue() {
  	this.setState({
      pause: !this.state.pause
    });
  }
  componentWillUnmount() {
  	if(this.newTorrentFunc)
  		window.torrentSocket.off('newTorrent', this.newTorrentFunc);
    if(this.tracketUpdate)
      window.torrentSocket.off('trackerTorrentUpdate', this.tracketUpdate);
  	if(this.displayNewTorrent)
  		delete this.displayNewTorrent;
    if(this.displayTorrentCounter)
      clearInterval(this.displayTorrentCounter);
  }
  render() {
    const style = {
      refresh: {
        display: 'inline-block',
        position: 'relative',
      },
    };

    if(this.state.searchingIndicator) {
      return (
        <div className='pad1'>
          <RefreshIndicator
            size={50}
            left={0}
            top={0}
            loadingColor="#FF9800"
            status="loading"
            style={style.refresh}
          />
        </div>
      );
    }

    if(!this.torrents || this.torrents.length == 0)
      return null;

    return (
      <List className='animated'>
        <Subheader className='recent-title' inset={true}>
        	<FlatButton style={{marginRight: '8px'}} label={!this.state.pause ? 'running' : 'stoped'} secondary={this.state.pause} primary={!this.state.pause} onClick={() =>{
	            this.pauseAndContinue()
	        }} />
        	Most recent torrents{this.displayQueue.length > 0 ? ` (and ${this.displayQueue.length} more)` : null}
        </Subheader>
        <Divider />
        {
        	this.torrents.map((torrent, index) =>{
        		return <TorrentLine key={index} torrent={torrent} />;
        	})
        }
      </List>
    );
  }
}