'use strict';

/* global socketio */

$(document).ready(() => {
  const socket = socketio.connect('..', '/pluginfw/installer');
  socket.on('disconnect', (reason) => {
    // The socket.io client will automatically try to reconnect for all reasons other than "io
    // server disconnect".
    if (reason === 'io server disconnect') socket.connect();
  });

  const search = (searchTerm, limit) => {
    if (search.searchTerm !== searchTerm) {
      search.offset = 0;
      search.results = [];
      search.end = false;
    }
    limit = limit ? limit : search.limit;
    search.searchTerm = searchTerm;
    socket.emit('search', {
      searchTerm,
      offset: search.offset,
      limit,
      sortBy: search.sortBy,
      sortDir: search.sortDir,
    });
    search.offset += limit;

    $('#search-progress').show();
    search.messages.show('fetching');
    search.searching = true;
  };
  search.searching = false;
  search.offset = 0;
  search.limit = 999;
  search.results = [];
  search.sortBy = 'name';
  search.sortDir = /* DESC?*/true;
  search.end = true;// have we received all results already?
  search.messages = {
    show: (msg) => {
      // $('.search-results .messages').show()
      $(`.search-results .messages .${msg}`).show();
      $(`.search-results .messages .${msg} *`).show();
    },
    hide: (msg) => {
      $('.search-results .messages').hide();
      $(`.search-results .messages .${msg}`).hide();
      $(`.search-results .messages .${msg} *`).hide();
    },
  };

  const installed = {
    progress: {
      show: (plugin, msg) => {
        $(`.installed-results .${plugin} .progress`).show();
        $(`.installed-results .${plugin} .progress .message`).text(msg);
        if ($(window).scrollTop() > $(`.${plugin}`).offset().top) {
          $(window).scrollTop($(`.${plugin}`).offset().top - 100);
        }
      },
      hide: (plugin) => {
        $(`.installed-results .${plugin} .progress`).hide();
        $(`.installed-results .${plugin} .progress .message`).text('');
      },
    },
    messages: {
      show: (msg) => {
        $('.installed-results .messages').show();
        $(`.installed-results .messages .${msg}`).show();
      },
      hide: (msg) => {
        $('.installed-results .messages').hide();
        $(`.installed-results .messages .${msg}`).hide();
      },
    },
    list: [],
  };

  const displayPluginList = (plugins, container, template) => {
    plugins.forEach((plugin) => {
      const row = template.clone();

      for (const attr in plugin) {
        if (attr === 'name') { // Hack to rewrite URLS into name
          const link = $('<a>')
              .attr('href', `https://npmjs.org/package/${plugin.name}`)
              .attr('plugin', 'Plugin details')
              .attr('rel', 'noopener noreferrer')
              .attr('target', '_blank')
              .text(plugin.name.substr(3));
          row.find('.name').append(link);
        } else {
          row.find(`.${attr}`).text(plugin[attr]);
        }
      }
      row.find('.version').text(plugin.version);
      row.addClass(plugin.name);
      row.data('plugin', plugin.name);
      container.append(row);
    });
    updateHandlers();
  };

  const sortPluginList = (plugins, property, /* ASC?*/dir) => plugins.sort((a, b) => {
    if (a[property] < b[property]) return dir ? -1 : 1;
    if (a[property] > b[property]) return dir ? 1 : -1;
    // a must be equal to b
    return 0;
  });

  const updateHandlers = () => {
    // Search
    $('#search-query').off('keyup').on('keyup', () => {
      search($('#search-query').val());
    });

    // Prevent form submit
    $('#search-query').parent().on('submit', () => false);

    // update & install
    $('.do-install, .do-update').off('click').on('click', function (e) {
      const $row = $(e.target).closest('tr');
      const plugin = $row.data('plugin');
      if ($(this).hasClass('do-install')) {
        $row.remove().appendTo('#installed-plugins');
        installed.progress.show(plugin, 'Installing');
      } else {
        installed.progress.show(plugin, 'Updating');
      }
      socket.emit('install', plugin);
      installed.messages.hide('nothing-installed');
    });

    // uninstall
    $('.do-uninstall').off('click').on('click', (e) => {
      const $row = $(e.target).closest('tr');
      const pluginName = $row.data('plugin');
      socket.emit('uninstall', pluginName);
      installed.progress.show(pluginName, 'Uninstalling');
      installed.list = installed.list.filter((plugin) => plugin.name !== pluginName);
    });

    // Sort
    $('.sort.up').off('click').on('click', function () {
      search.sortBy = $(this).attr('data-label').toLowerCase();
      search.sortDir = false;
      search.offset = 0;
      search(search.searchTerm, search.results.length);
      search.results = [];
    });
    $('.sort.down, .sort.none').off('click').on('click', function () {
      search.sortBy = $(this).attr('data-label').toLowerCase();
      search.sortDir = true;
      search.offset = 0;
      search(search.searchTerm, search.results.length);
      search.results = [];
    });
  };

  socket.on('results:search', (data) => {
    if (!data.results.length) search.end = true;
    if (data.query.offset === 0) search.results = [];
    search.messages.hide('nothing-found');
    search.messages.hide('fetching');
    $('#search-query').prop('disabled', false);

    console.log('got search results', data);

    // add to results
    search.results = search.results.concat(data.results);

    // Update sorting head
    $('.sort')
        .removeClass('up down')
        .addClass('none');
    $(`.search-results thead th[data-label=${data.query.sortBy}]`)
        .removeClass('none')
        .addClass(data.query.sortDir ? 'up' : 'down');

    // re-render search results
    const searchWidget = $('.search-results');
    searchWidget.find('.results *').remove();
    if (search.results.length > 0) {
      displayPluginList(
          search.results, searchWidget.find('.results'), searchWidget.find('.template tr'));
    } else {
      search.messages.show('nothing-found');
    }
    search.messages.hide('fetching');
    $('#search-progress').hide();
    search.searching = false;
  });

  socket.on('results:installed', (data) => {
    installed.messages.hide('fetching');
    installed.messages.hide('nothing-installed');

    installed.list = data.installed;
    sortPluginList(installed.list, 'name', /* ASC?*/true);

    // filter out epl
    installed.list = installed.list.filter((plugin) => plugin.name !== 'ep_etherpad-lite');

    // remove all installed plugins (leave plugins that are still being installed)
    installed.list.forEach((plugin) => {
      $(`#installed-plugins .${plugin.name}`).remove();
    });

    if (installed.list.length > 0) {
      displayPluginList(installed.list, $('#installed-plugins'), $('#installed-plugin-template'));
      socket.emit('checkUpdates');
    } else {
      installed.messages.show('nothing-installed');
    }
  });

  socket.on('results:updatable', (data) => {
    data.updatable.forEach((pluginName) => {
      const actions = $(`#installed-plugins > tr.${pluginName} .actions`);
      actions.find('.do-update').remove();
      actions.append(
          $('<input>').addClass('do-update').attr('type', 'button').attr('value', 'Update'));
    });
    updateHandlers();
  });

  socket.on('finished:install', (data) => {
    if (data.error) {
      if (data.code === 'EPEERINVALID') {
        alert("This plugin requires that you update Etherpad so it can operate in it's true glory");
      }
      alert(`An error occurred while installing ${data.plugin} \n${data.error}`);
      $(`#installed-plugins .${data.plugin}`).remove();
    }

    socket.emit('getInstalled');

    // update search results
    search.offset = 0;
    search(search.searchTerm, search.results.length);
    search.results = [];
  });

  socket.on('finished:uninstall', (data) => {
    if (data.error) {
      alert(`An error occurred while uninstalling the ${data.plugin} \n${data.error}`);
    }

    // remove plugin from installed list
    $(`#installed-plugins .${data.plugin}`).remove();

    socket.emit('getInstalled');

    // update search results
    search.offset = 0;
    search(search.searchTerm, search.results.length);
    search.results = [];
  });

  socket.on('connect', () => {
    updateHandlers();
    socket.emit('getInstalled');
    search.searchTerm = null;
    search($('#search-query').val());
  });

  // check for updates every 5mins
  setInterval(() => {
    socket.emit('checkUpdates');
  }, 1000 * 60 * 5);
});