import React, { Component } from 'react'
import { connect } from 'react-redux'
import Router from 'next/router'
import Paginate from 'react-paginate'
import { format } from 'url'
import Page from '../comps/Page'
import PaddedRow from '../comps/PaddedRow'
import Spinner from '../comps/Spinner'
import DocItem from '../comps/DocItem'
import { $limit, getDocs, buildQ } from '../util/getDocs'
import getJwt from '../util/getJwt'
import getUrl from '../util/getUrl'
import mapUser from '../util/mapUser'

class Index extends Component {
  state = {
    $sort: 'updated:-1',
    $search: '',
    page: 1,
    pending: false,
    error: null,
    total: 0,
    docs: [],
  }

  static async getInitialProps({ req, query }) {
    let page = 1,
      $search = ''
    if (query) {
      page = query.page || page
      $search = query.search || $search
    }
    const jwt = getJwt(req)
    if (!jwt) return { total: 0, docs: [] }
    const q = buildQ({ $search, $skip: page })
    const data = await getDocs(q, req ? jwt : false)
    return { ...data, page, $search }
  }

  static getDerivedStateFromProps(nextProps, prevState) {
    let { docs, total, page, $search } = nextProps
    if (
      docs.length !== prevState.docs.length ||
      page !== prevState.page ||
      $search !== prevState.$search
    ) {
      return { total, docs, page, $search, pending: false }
    }
    return null
  }

  pushQuery = query =>
    Router.push(
      { pathname: '/', query },
      format({ pathname: getUrl('/'), query })
    )

  updDocs = (time, doSearch) => {
    clearTimeout(this.docsTime)
    this.docsTime = setTimeout(async () => {
      let { $sort, $search, page } = this.state
      if (doSearch) {
        const query = { search: $search }
        if (!$search) delete query.search
        this.pushQuery(query)
      }
      this.setState({ error: null })
      this.docsTime = setTimeout(() => {
        this.setState({ pending: true })
      }, 125)

      const q = buildQ({ $search, $sort, $skip: page })
      const data = await getDocs(q)
      clearTimeout(this.docsTime)
      this.setState({ ...data, pending: false })
    }, time || 275)
  }

  updQuery = e => {
    this.setState({ [e.target.id]: e.target.value })
    this.updDocs(0, e.target.id === '$search')
  }

  handlePage = ({ selected }) => {
    const { $search } = this.state
    const page = selected + 1
    const query = {}
    this.setState({ page })
    if (page > 1) query.page = page
    if ($search) query.search = $search
    this.pushQuery(query)
    this.updDocs(1)
  }

  componentDidUpdate(prevProps) {
    const { user, docs } = this.props
    if (prevProps.user.email === user.email) return
    if (user.email && docs.length === 0) this.updDocs(1)
  }

  render() {
    const { $sort, $search, pending, error, docs, total, page } = this.state
    const pages = Math.ceil(total / $limit)
    return (
      <Page>
        <PaddedRow>
          <input
            type="text"
            placeholder="Search knowledge base..."
            maxLength={128}
            value={$search}
            className="search"
            id="$search"
            onChange={this.updQuery}
          />
        </PaddedRow>
        <PaddedRow>
          <div className="inline" style={{ width: '100%' }}>
            <h4 className="noMargin">Docs</h4>
            <div className="float-right inline">
              <label htmlFor="sort">Sort: </label>
              <select
                id="$sort"
                value={$sort}
                onChange={this.updQuery}
                style={{ width: 150 }}
              >
                <option value="updated:-1">{'Updated (new -> old)'}</option>
                <option value="updated:1">{'Updated (old -> new)'}</option>
                <option value="created:-1">{'Created (new -> old)'}</option>
                <option value="created:1">{'Created (old -> new)'}</option>
                <option value="dirName:1">{'Name (A -> Z)'}</option>
                <option value="dirName:-1">{'Name (Z -> A)'}</option>
              </select>
            </div>
          </div>
        </PaddedRow>
        <PaddedRow>
          {docs.length > 0 || error || pending ? null : <p>No docs found...</p>}
          {!error ? null : <p>{error}</p>}
          {!pending || error ? null : (
            <Spinner style={{ margin: '25px auto 0' }} />
          )}
          {docs.length < 1 || pending || error ? null : (
            <div>
              <table>
                <thead>
                  <tr>
                    <th>
                      Doc <span className="float-right">Modified</span>
                    </th>
                  </tr>
                </thead>
                <tbody>
                  {docs.map(doc => <DocItem {...doc} key={doc.id} />)}
                </tbody>
              </table>
              {pages < 2 ? null : (
                <Paginate
                  pageCount={pages}
                  containerClassName="paginate"
                  activeClassName="active"
                  onPageChange={this.handlePage}
                  forcePage={page - 1}
                />
              )}
            </div>
          )}
        </PaddedRow>
      </Page>
    )
  }
}
export default connect(mapUser)(Index)