//
// Copyright (C) Stanislaw Adaszewski, 2020
// Contact: s.adaszewski@gmail.com
// Website: https://adared.ch/wba
// License: GNU Affero General Public License, Version 3
//

import { h, Component } from 'preact';
import WBManifestWorkerWrapper from 'wb-manifest-worker-wrapper';
import makeArvadosRequest from 'make-arvados-request';
import WBTable from 'wb-table';
import WBPagination from 'wb-pagination';

function unescapeName(name) {
  return name.replace(/(\\\\|\\[0-9]{3})/g,
    (_, $1) => ($1 === '\\\\' ? '\\' : String.fromCharCode(parseInt($1.substr(1), 8))));
}

class WBBrowseDialogCollectionContent extends Component {
  constructor(...args) {
    super(...args);
    this.state.manifestWorker = new WBManifestWorkerWrapper();
    this.state.mode = 'manifestDownload';
    this.state.rows = [];
  }

  componentDidMount() {
    const { app, collectionUuid } = this.props;
    const { arvHost, arvToken } = app.state;
    const { manifestWorker } = this.state;

    let prom = makeArvadosRequest(arvHost, arvToken,
      '/arvados/v1/collections/' + collectionUuid);

    let streams;

    prom = prom.then(xhr => {
      streams = xhr.response.manifest_text.split('\n');
      const paths = streams.filter(s => s).map(s => {
        const n = s.indexOf(' ');
        return unescapeName(s.substr(0, n));
      });

      return manifestWorker.postMessage([ 'precreatePaths', paths ]);
    });

    prom = prom.then(() => {
      this.setState({ 'mode': 'manifestParse' });
      let prom_1 = new Promise(accept => accept());
      for (let i = 0; i < streams.length; i++) {
        prom_1 = prom_1.then(() => manifestWorker.postMessage([ 'parseStream', streams[i] ]));
        prom_1 = prom_1.then(() => manifestWorker.postMessage([ 'listDirectory', '.' + this.props.collectionPath, true ]));
        prom_1 = prom_1.then(e => this.prepareRows(e.data[1]));
      }
      return prom_1;
    });

    prom = prom.then(() => manifestWorker.postMessage([ 'listDirectory', '.' + this.props.collectionPath, true ]));
    prom = prom.then(e => {
      this.state.mode = 'browsingReady';
      this.prepareRows(e.data[1])
    });
  }

  componentWillReceiveProps(nextProps) {
    this.props = nextProps;
    if (this.state.mode !== 'browsingReady')
      return;
    let prom = this.state.manifestWorker.postMessage([
      'listDirectory', '.' + this.props.collectionPath, true
    ]);
    prom = prom.then(e => this.prepareRows(e.data[1]));
  }

  prepareRows(listing) {
    const { makeSelectionCell, collectionPath, navigate,
      page, itemsPerPage, collectionUuid, textSearch, selectWhat } = this.props;
    const textLower = textSearch.toLowerCase();
    listing = listing.filter(it => (it[1].toLowerCase().indexOf(textLower) !== -1));
    const numPages = Math.ceil(listing.length / itemsPerPage);
    const rows = listing.slice(page * itemsPerPage,
      (page + 1) * itemsPerPage).map(it => [
      ((it[0] === 'd' && [].concat(selectWhat).indexOf('directory') !== -1) ||
        (it[0] === 'f' && [].concat(selectWhat).indexOf('file') !== -1)) ?
        makeSelectionCell(collectionUuid + collectionPath + '/' + it[1] + (it[0] === 'd' ? '/' : '')) :
        null,
      it[0] === 'd' ? (
        <a href="#" onclick={ e => {
          e.preventDefault();
          navigate({ 'collectionPath': collectionPath + '/' + it[1],
            'bottomPage': 0 });
        } }>{ it[1] }</a>
      ) : it[1],
      it[0] === 'f' ? filesize(it[2]) : ''
    ]);
    this.setState({ rows, numPages });
  }

  render({ page, navigate }, { rows, mode, numPages }) {
    return (
      <div>
        { mode === 'browsingReady' ? (
          null
        ) : [
          <div>{ mode === 'manifestParse' ? 'Parsing manifest...' : 'Downloading manifest...' }</div>,
          <div class="progress my-2">
            <div class={ 'progress-bar progress-bar-striped progress-bar-animated' +
              (mode === 'manifestParse' ? ' bg-success': '') } role="progressbar"
              aria-valuenow="100" aria-valuemin="0" aria-valuemax="100" style="width: 100%"></div>
          </div>
        ] }
        <WBTable headerClasses={ [ 'w-1' ] }
          columns={ [ '', 'Name', 'Size' ] } rows={ rows } />
        <WBPagination numPages={ numPages } activePage={ page }
          onPageChanged={ i => navigate({ 'bottomPage': i }) } />
      </div>
    );
  }
}

WBBrowseDialogCollectionContent.defaultProps = {
  'itemsPerPage': 20
};

export default WBBrowseDialogCollectionContent;