import React, {Component} from 'react';
import Select from "react-virtualized-select";
import AlbumList from './AlbumList.js';
import {getQueryString} from './utils.js';

const fetchOpts = { credentials: 'same-origin' }

export default class Selector extends Component {
  selects = [{type: 'artist', title: 'Artists'},
             {type: 'year', title: 'Years'},
             {type: 'genre', title: 'Genres'},
             {type: 'publisher', title: 'Labels'},
             {type: 'country', title: 'Countries'},
             {type: 'type', title: 'Album types'},
             {type: 'status', title: 'Album statuses'}];
  constructor(props) {
    super(props);
    this.state = {
      albumList: {key:'', albums: [], error: false, hasMore: false},
      filters: {},
      filter: '',
    };
    this.filterTimeout = null;
  }
  genAlbumListKey() {
    const {filter, filters} = this.state
    return `${filter}-${this.selects.map(({type}) => filters[type] ? filters[type].item : '').join('-')}`
  }
  loadAlbums = (page) => {
    const {filter, filters} = this.state
    const limit  = 15;
    const offset = page * limit;
    const params = {filter, offset, limit:(limit+1)};
    let key = (page === 0 ? this.genAlbumListKey() : this.state.albumList.key)
    for (const {type} of this.selects) {
      if (filters[type]) {
        params[type] = filters[type].item;
      }
    }
    return fetch(`/cat/album?${getQueryString(params)}`, fetchOpts)
      .then(res => (res.ok ? res.json() : Promise.reject({message:res.statusText})))
      .then(data => {
        const hasMore = (data.length > limit)
        const albums = page === 0 ? data.slice(0, limit) : this.state.albumList.albums.concat(data.slice(0, limit))
        const albumList = {key, albums, hasMore}
        this.setState({albumList})
        return albums;
      })
      .catch(error => {
        console.log(error)
        const albumList = {key, error}
        this.setState({albumList})
      })
  }
  componentDidMount() {
    this.loadAlbums(0)
  }
  componentDidUpdate(prevProps, prevState) {
    const {filters} = this.state;
    if (filters !== prevState.filters) {
      this.loadAlbums(0);
    }
  }
  handleFilterChange = (e) => {
    if (this.filterTimeout) {
      clearInterval(this.filterTimeout);
    }
    const filter = e.target.value;
    this.filterTimeout = setTimeout(() => {
      this.loadAlbums(0);
    }, 500);
    this.setState({filter})
  }
  handleLoadOptions(cat, q, page) {
    const pageSize = 100
    const params = {filter:q}
    params.offset = (page - 1) * pageSize;
    params.limit = pageSize;
    return fetch(`/cat/${cat}?${getQueryString(params)}`, fetchOpts)
      .then(res => (res.ok ? res.json() : Promise.reject({message:res.statusText})))
      .then(options => ({options}))
  }
  handleSelectChange(cat, option) {
    const filters = Object.assign({}, this.state.filters,  {[cat]: option});
    this.setState({filters, filter: ''})
  }

  _optionRenderer ({ focusedOption, focusOption, key, labelKey, option, selectValue, style, valueArray }) {
    const className = ['VirtualizedSelectOption']

    if (option === focusedOption) {
      className.push('VirtualizedSelectFocusedOption')
    }

    if (option.disabled) {
      className.push('VirtualizedSelectDisabledOption')
    }

    if (valueArray && valueArray.indexOf(option) >= 0) {
      className.push('VirtualizedSelectSelectedOption')
    }

    if (option.className) {
      className.push(option.className)
    }

    const events = option.disabled
      ? {}
      : {
        onClick: () => selectValue(option),
        onMouseEnter: () => focusOption(option)
      }

    return (
      <div
        className={className.join(' ')}
        key={key}
        style={style}
        title={option.title}
        {...events}
      >
        {option.item} - {option.count}
      </div>
    )
  }
  render() {
    return (
      <div className="Selector">
        <div className="SelectorFilters">
          {this.selects.map(({type, title}) => (
            <div className="section" key={type}>
              <h3>{title}</h3>
              <Select
                async
                pagination
                autoload={true}
                optionRenderer={this._optionRenderer}
                loadOptions={(q,p) => this.handleLoadOptions(type, q, p)}
                onChange={o => this.handleSelectChange(type, o)}
                labelKey="item"
                valueKey="item"
                value={this.state.filters[type]}
              />
            </div>
          ))}
          <div className="section">
            <h3>Search</h3>
            <input className="Filter"
              type="text"
              value={this.state.filter}
              placeholder="Search albums"
              onChange={this.handleFilterChange} />
          </div>
        </div><br style={{clear:'both'}} />
        <AlbumList
          title="Albums"
          {...this.state.albumList}
          loadMore={this.loadAlbums}
          onPlayAlbum={this.props.onPlayAlbum} />
      </div>
    );
  }
}