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

function FileRow(torrent, depth, name, indices, even) {
  const fields = {
    have: 0,
    indices: [],
    isWanted: true,
    priorityLow: false,
    priorityNormal: false,
    priorityHigh: false,
    me: this,
    size: 0,
    torrent: null,
  };

  const elements = {
    priority_low_button: null,
    priority_normal_button: null,
    priority_high_button: null,
    progress: null,
    root: null,
  };

  const initialize = function (torrent, depth, name, indices, even) {
    fields.torrent = torrent;
    fields.indices = indices;
    createRow(torrent, depth, name, even);
  };

  const refreshWantedHTML = function () {
    const e = $(elements.root);
    e.toggleClass('skip', !fields.isWanted);
    e.toggleClass('complete', isDone());
    $(e[0].checkbox).prop('disabled', !isEditable());
    $(e[0].checkbox).prop('checked', fields.isWanted);
  };

  const refreshProgressHTML = function () {
    const pct = 100 * (fields.size ? fields.have / fields.size : 1.0);
    const c = [
      Transmission.fmt.size(fields.have),
      ' of ',
      Transmission.fmt.size(fields.size),
      ' (',
      Transmission.fmt.percentString(pct),
      '%)',
    ].join('');
    setTextContent(elements.progress, c);
  };

  const refreshImpl = function () {
    let i,
      file,
      have = 0,
      size = 0,
      wanted = false,
      low = false,
      normal = false,
      high = false;

    // loop through the file_indices that affect this row
    for (i = 0; i < fields.indices.length; ++i) {
      file = fields.torrent.getFile(fields.indices[i]);
      have += file.bytesCompleted;
      size += file.length;
      wanted |= file.wanted;
      switch (file.priority) {
        case -1:
          low = true;
          break;
        case 0:
          normal = true;
          break;
        case 1:
          high = true;
          break;
      }
    }

    if (fields.have != have || fields.size != size) {
      fields.have = have;
      fields.size = size;
      refreshProgressHTML();
    }

    if (fields.isWanted !== wanted) {
      fields.isWanted = wanted;
      refreshWantedHTML();
    }

    if (fields.priorityLow !== low) {
      fields.priorityLow = low;
      $(elements.priority_low_button).toggleClass('selected', low);
    }

    if (fields.priorityNormal !== normal) {
      fields.priorityNormal = normal;
      $(elements.priority_normal_button).toggleClass('selected', normal);
    }

    if (fields.priorityHigh !== high) {
      fields.priorityHigh = high;
      $(elements.priority_high_button).toggleClass('selected', high);
    }
  };

  var isDone = function () {
    return fields.have >= fields.size;
  };

  var isEditable = function () {
    return fields.torrent.getFileCount() > 1 && !isDone();
  };

  var createRow = function (torrent, depth, name, even) {
    let e, root, box;

    root = document.createElement('li');
    root.className = 'inspector_torrent_file_list_entry' + (even ? 'even' : 'odd');
    elements.root = root;

    e = document.createElement('input');
    e.type = 'checkbox';
    e.className = 'file_wanted_control';
    e.title = 'Download file';
    $(e).change(function (ev) {
      fireWantedChanged($(ev.currentTarget).prop('checked'));
    });
    root.checkbox = e;
    root.appendChild(e);

    e = document.createElement('div');
    e.className = 'file-priority-radiobox';
    box = e;

    e = document.createElement('div');
    e.className = 'low';
    e.title = 'Low Priority';
    $(e).click(function () {
      firePriorityChanged(-1);
    });
    elements.priority_low_button = e;
    box.appendChild(e);

    e = document.createElement('div');
    e.className = 'normal';
    e.title = 'Normal Priority';
    $(e).click(function () {
      firePriorityChanged(0);
    });
    elements.priority_normal_button = e;
    box.appendChild(e);

    e = document.createElement('div');
    e.title = 'High Priority';
    e.className = 'high';
    $(e).click(function () {
      firePriorityChanged(1);
    });
    elements.priority_high_button = e;
    box.appendChild(e);

    root.appendChild(box);

    e = document.createElement('div');
    e.className = 'inspector_torrent_file_list_entry_name';
    setTextContent(e, name);
    $(e).click(fireNameClicked);
    root.appendChild(e);

    e = document.createElement('div');
    e.className = 'inspector_torrent_file_list_entry_progress';
    root.appendChild(e);
    $(e).click(fireNameClicked);
    elements.progress = e;

    $(root).css('margin-left', '' + depth * 16 + 'px');

    refreshImpl();
    return root;
  };

  var fireWantedChanged = function (do_want) {
    $(fields.me).trigger('wantedToggled', [fields.indices, do_want]);
  };

  var firePriorityChanged = function (priority) {
    $(fields.me).trigger('priorityToggled', [fields.indices, priority]);
  };

  var fireNameClicked = function () {
    $(fields.me).trigger('nameClicked', [fields.me, fields.indices]);
  };

  /***
   ****  PUBLIC
   ***/

  this.getElement = function () {
    return elements.root;
  };
  this.refresh = function () {
    refreshImpl();
  };

  initialize(torrent, depth, name, indices, even);
}