/**
 * Copyright © Mnemosyne LLC
 *
 * This file is licensed under the GPLv2.
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 */

function TorrentRendererHelper() {}

TorrentRendererHelper.getProgressInfo = function (controller, t) {
  let pct, extra;
  const s = t.getStatus();
  const seed_ratio_limit = t.seedRatioLimit(controller);

  if (t.needsMetaData()) {
    pct = t.getMetadataPercentComplete() * 100;
  } else if (!t.isDone()) {
    pct = Math.round(t.getPercentDone() * 100);
  } else if (seed_ratio_limit > 0 && t.isSeeding()) {
    // don't split up the bar if paused or queued
    pct = Math.round((t.getUploadRatio() * 100) / seed_ratio_limit);
  } else {
    pct = 100;
  }

  if (s === Torrent._StatusStopped) {
    extra = 'paused';
  } else if (s === Torrent._StatusDownloadWait) {
    extra = 'leeching queued';
  } else if (t.needsMetaData()) {
    extra = 'magnet';
  } else if (s === Torrent._StatusDownload) {
    extra = 'leeching';
  } else if (s === Torrent._StatusSeedWait) {
    extra = 'seeding queued';
  } else if (s === Torrent._StatusSeed) {
    extra = 'seeding';
  } else {
    extra = '';
  }

  return {
    percent: pct,
    complete: ['torrent_progress_bar', 'complete', extra].join(' '),
    incomplete: ['torrent_progress_bar', 'incomplete', extra].join(' '),
  };
};

TorrentRendererHelper.createProgressbar = function (classes) {
  let complete, incomplete, progressbar;

  complete = document.createElement('div');
  complete.className = 'torrent_progress_bar complete';

  incomplete = document.createElement('div');
  incomplete.className = 'torrent_progress_bar incomplete';

  progressbar = document.createElement('div');
  progressbar.className = 'torrent_progress_bar_container ' + classes;
  progressbar.appendChild(complete);
  progressbar.appendChild(incomplete);

  return {
    element: progressbar,
    complete: complete,
    incomplete: incomplete,
  };
};

TorrentRendererHelper.renderProgressbar = function (controller, t, progressbar) {
  let e, style, width, display;
  const info = TorrentRendererHelper.getProgressInfo(controller, t);

  // update the complete progressbar
  e = progressbar.complete;
  style = e.style;
  width = '' + info.percent + '%';
  display = info.percent > 0 ? 'block' : 'none';
  if (style.width !== width || style.display !== display) {
    $(e).css({
      width: '' + info.percent + '%',
      display: display,
    });
  }

  if (e.className !== info.complete) {
    e.className = info.complete;
  }

  // update the incomplete progressbar
  e = progressbar.incomplete;
  display = info.percent < 100 ? 'block' : 'none';

  if (e.style.display !== display) {
    e.style.display = display;
  }

  if (e.className !== info.incomplete) {
    e.className = info.incomplete;
  }
};

TorrentRendererHelper.formatUL = function (t) {
  return '▲' + Transmission.fmt.speedBps(t.getUploadSpeed());
};

TorrentRendererHelper.formatDL = function (t) {
  return '▼' + Transmission.fmt.speedBps(t.getDownloadSpeed());
};

TorrentRendererHelper.formatETA = function (t) {
  const eta = t.getETA();
  if (eta < 0 || eta >= 999 * 60 * 60) {
    return '';
  }
  return 'ETA: ' + Transmission.fmt.timeInterval(eta);
};

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function TorrentRendererFull() {}
TorrentRendererFull.prototype = {
  createRow: function () {
    let root, name, peers, progressbar, details, image, button;

    root = document.createElement('li');
    root.className = 'torrent';

    name = document.createElement('div');
    name.className = 'torrent_name';

    peers = document.createElement('div');
    peers.className = 'torrent_peer_details';

    progressbar = TorrentRendererHelper.createProgressbar('full');

    details = document.createElement('div');
    details.className = 'torrent_progress_details';

    image = document.createElement('div');
    button = document.createElement('a');
    button.appendChild(image);

    root.appendChild(name);
    root.appendChild(peers);
    root.appendChild(button);
    root.appendChild(progressbar.element);
    root.appendChild(details);

    root._name_container = name;
    root._peer_details_container = peers;
    root._progress_details_container = details;
    root._progressbar = progressbar;
    root._pause_resume_button_image = image;
    root._toggle_running_button = button;

    return root;
  },

  getPeerDetails: function (t) {
    let err,
      peer_count,
      webseed_count,
      fmt = Transmission.fmt;

    if ((err = t.getErrorMessage())) {
      return err;
    }

    if (t.isDownloading()) {
      peer_count = t.getPeersConnected();
      webseed_count = t.getWebseedsSendingToUs();

      if (webseed_count && peer_count) {
        // Downloading from 2 of 3 peer(s) and 2 webseed(s)
        return [
          'Downloading from',
          t.getPeersSendingToUs(),
          'of',
          fmt.countString('peer', 'peers', peer_count),
          'and',
          fmt.countString('web seed', 'web seeds', webseed_count),
          '–',
          TorrentRendererHelper.formatDL(t),
          TorrentRendererHelper.formatUL(t),
        ].join(' ');
      } else if (webseed_count) {
        // Downloading from 2 webseed(s)
        return [
          'Downloading from',
          fmt.countString('web seed', 'web seeds', webseed_count),
          '–',
          TorrentRendererHelper.formatDL(t),
          TorrentRendererHelper.formatUL(t),
        ].join(' ');
      } else {
        // Downloading from 2 of 3 peer(s)
        return [
          'Downloading from',
          t.getPeersSendingToUs(),
          'of',
          fmt.countString('peer', 'peers', peer_count),
          '–',
          TorrentRendererHelper.formatDL(t),
          TorrentRendererHelper.formatUL(t),
        ].join(' ');
      }
    }

    if (t.isSeeding()) {
      return [
        'Seeding to',
        t.getPeersGettingFromUs(),
        'of',
        fmt.countString('peer', 'peers', t.getPeersConnected()),
        '-',
        TorrentRendererHelper.formatUL(t),
      ].join(' ');
    }

    if (t.isChecking()) {
      return [
        'Verifying local data (',
        Transmission.fmt.percentString(100.0 * t.getRecheckProgress()),
        '% tested)',
      ].join('');
    }

    return t.getStateString();
  },

  getProgressDetails: function (controller, t) {
    if (t.needsMetaData()) {
      let MetaDataStatus = 'retrieving';
      if (t.isStopped()) {
        MetaDataStatus = 'needs';
      }
      const percent = 100 * t.getMetadataPercentComplete();
      return [
        'Magnetized transfer - ' + MetaDataStatus + ' metadata (',
        Transmission.fmt.percentString(percent),
        '%)',
      ].join('');
    }

    let c;
    const sizeWhenDone = t.getSizeWhenDone();
    const totalSize = t.getTotalSize();
    const is_done = t.isDone() || t.isSeeding();

    if (is_done) {
      if (totalSize === sizeWhenDone) {
        // seed: '698.05 MiB'
        c = [Transmission.fmt.size(totalSize)];
      } else {
        // partial seed: '127.21 MiB of 698.05 MiB (18.2%)'
        c = [
          Transmission.fmt.size(sizeWhenDone),
          ' of ',
          Transmission.fmt.size(t.getTotalSize()),
          ' (',
          t.getPercentDoneStr(),
          '%)',
        ];
      }
      // append UL stats: ', uploaded 8.59 GiB (Ratio: 12.3)'
      c.push(
        ', uploaded ',
        Transmission.fmt.size(t.getUploadedEver()),
        ' (Ratio ',
        Transmission.fmt.ratioString(t.getUploadRatio()),
        ')'
      );
    } else {
      // not done yet
      c = [
        Transmission.fmt.size(sizeWhenDone - t.getLeftUntilDone()),
        ' of ',
        Transmission.fmt.size(sizeWhenDone),
        ' (',
        t.getPercentDoneStr(),
        '%)',
      ];
    }

    // maybe append eta
    if (!t.isStopped() && (!is_done || t.seedRatioLimit(controller) > 0)) {
      c.push(' - ');
      const eta = t.getETA();
      if (eta < 0 || eta >= 999 * 60 * 60 /* arbitrary */) {
        c.push('remaining time unknown');
      } else {
        c.push(Transmission.fmt.timeInterval(t.getETA()), ' remaining');
      }
    }

    return c.join('');
  },

  render: function (controller, t, root) {
    // name
    setTextContent(root._name_container, t.getName());

    // progressbar
    TorrentRendererHelper.renderProgressbar(controller, t, root._progressbar);

    // peer details
    const has_error = t.getError() !== Torrent._ErrNone;
    let e = root._peer_details_container;
    $(e).toggleClass('error', has_error);
    setTextContent(e, this.getPeerDetails(t));

    // progress details
    e = root._progress_details_container;
    setTextContent(e, this.getProgressDetails(controller, t));

    // pause/resume button
    const is_stopped = t.isStopped();
    e = root._pause_resume_button_image;
    e.alt = is_stopped ? 'Resume' : 'Pause';
    e.className = is_stopped ? 'torrent_resume' : 'torrent_pause';
  },
};

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function TorrentRendererCompact() {}
TorrentRendererCompact.prototype = {
  createRow: function () {
    let progressbar, details, name, root;

    progressbar = TorrentRendererHelper.createProgressbar('compact');

    details = document.createElement('div');
    details.className = 'torrent_peer_details compact';

    name = document.createElement('div');
    name.className = 'torrent_name compact';

    root = document.createElement('li');
    root.appendChild(progressbar.element);
    root.appendChild(details);
    root.appendChild(name);
    root.className = 'torrent compact';
    root._progressbar = progressbar;
    root._details_container = details;
    root._name_container = name;
    return root;
  },

  getPeerDetails: function (t) {
    let c;
    if ((c = t.getErrorMessage())) {
      return c;
    }
    if (t.isDownloading()) {
      const have_dn = t.getDownloadSpeed() > 0;
      const have_up = t.getUploadSpeed() > 0;

      if (!have_up && !have_dn) {
        return 'Idle';
      }
      let s = '';
      if (!isMobileDevice) {
        s = TorrentRendererHelper.formatETA(t) + ' ';
      }
      if (have_dn) {
        s += TorrentRendererHelper.formatDL(t);
      }
      if (have_dn && have_up) {
        s += ' ';
      }
      if (have_up) {
        s += TorrentRendererHelper.formatUL(t);
      }
      return s;
    }
    if (t.isSeeding()) {
      return [
        'Ratio: ',
        Transmission.fmt.ratioString(t.getUploadRatio()),
        ', ',
        TorrentRendererHelper.formatUL(t),
      ].join('');
    }
    return t.getStateString();
  },

  render: function (controller, t, root) {
    // name
    const is_stopped = t.isStopped();
    let e = root._name_container;
    $(e).toggleClass('paused', is_stopped);
    setTextContent(e, t.getName());

    // peer details
    const has_error = t.getError() !== Torrent._ErrNone;
    e = root._details_container;
    $(e).toggleClass('error', has_error);
    setTextContent(e, this.getPeerDetails(t));

    // progressbar
    TorrentRendererHelper.renderProgressbar(controller, t, root._progressbar);
  },
};

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function TorrentRow(view, controller, torrent) {
  this.initialize(view, controller, torrent);
}
TorrentRow.prototype = {
  initialize: function (view, controller, torrent) {
    const row = this;
    this._view = view;
    this._torrent = torrent;
    this._element = view.createRow();
    this.render(controller);
    $(this._torrent).bind('dataChanged.torrentRowListener', function () {
      row.render(controller);
    });
  },
  getElement: function () {
    return this._element;
  },
  render: function (controller) {
    const tor = this.getTorrent();
    if (tor) {
      this._view.render(controller, tor, this.getElement());
    }
  },
  isSelected: function () {
    return this.getElement().className.indexOf('selected') !== -1;
  },

  getTorrent: function () {
    return this._torrent;
  },
  getTorrentId: function () {
    return this.getTorrent().getId();
  },
};