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

import makeArvadosRequest from 'make-arvados-request';

class WBArvadosCollection {
  constructor(arvHost, arvToken, uuid) {
    this.arvHost = arvHost;
    this.arvToken = arvToken;
    this.uuid = uuid;
    this.meta = null;
  }

  fetchMeta() {
    let prom = makeArvadosRequest(this.arvHost, this.arvToken,
      '/arvados/v1/collections/' + this.uuid);
    prom = prom.then(xhr => {
      this.meta = xhr.response;
    });
    return prom;
  }

  parseManifest() {
    if (this.meta === null)
      throw Error('You must call fetchMeta() first and wait for the returned Promise.');

    let manifest = this.meta.manifest_text;
    let streams = manifest.split('\n');
    this.content = streams.map(s => {
      let tokens = s.split(' ');
      let streamName = tokens[0];
      let rx = /^[a-f0-9]{32}\+[0-9]+/;
      let n = tokens.map(t => rx.exec(t));
      n = n.indexOf(null);
      let locators = tokens.slice(1, n)
      let fileTokens = tokens.slice(n);
      let fileNames = fileTokens.map(t => t.split(':')[2]);
      let fileSizes = {};
      fileTokens.map(t => {
        let [ start, end, name ] = t.split(':');
        if (!(name in fileSizes))
          fileSizes[name] = 0;
        fileSizes[name] += Number(end) - Number(start);
      });
      fileSizes = fileNames.map(n => fileSizes[n]);
      return [ streamName, fileNames, fileSizes ];
    });

    return this.content;
  }
}

export WBArvadosCollection;