//  node .migrations/20140829_change_headAccessory_to_eyewear.js

let migrationName = '20140829_change_headAccessory_to_eyewear';
let authorName = 'Alys'; // in case script author needs to know when their ...
let authorUuid = 'd904bd62-da08-416b-a816-ba797c9ee265'; // ... own data is done

// IMPORTANT NOTE: this migration was written when we were using version 3 of lodash.
// We've now upgraded to lodash v4 but the code used in this migration has not been
// adapted to work with it. Before this migration is used again any lodash method should
// be checked for compatibility against the v4 changelog and changed if necessary.
// https://github.com/lodash/lodash/wiki/Changelog#v400

/**
 * https://github.com/HabitRPG/habitrpg/issues/3645
 */
let mongo = require('mongoskin');
let _ = require('lodash');
let liveUsers = mongo.db('localhost:27017/habitrpg2?auto_reconnect').collection('users');

let fields = {migration: 1,
              'items.gear.costume.headAccessory': 1,
              'items.gear.equipped.headAccessory': 1,
              'items.gear.owned.headAccessory_special_wondercon_black': 1,
              'items.gear.owned.headAccessory_special_wondercon_red': 1,
              'items.gear.owned.headAccessory_special_summerRogue': 1,
              'items.gear.owned.headAccessory_special_summerWarrior': 1,
};

let progressCount = 1000;
let count = 0;
liveUsers.findEach({ $and: [
  { migration: {$ne: migrationName} },
  { $or: [
    {'items.gear.owned.headAccessory_special_summerRogue': {$exists: true}},
    {'items.gear.owned.headAccessory_special_summerWarrior': {$exists: true}},
    {'items.gear.owned.headAccessory_special_wondercon_red': {$exists: true}},
    {'items.gear.owned.headAccessory_special_wondercon_black': {$exists: true}},
  ]},
]}, fields, {batchSize: 250}, function (err, user) {
  count++;
  if (!user) err = '!user';
  if (err) {
    return console.error(err);
  }

  let set = {migration: migrationName};
  let unset = {};

  let oldToNew = {
    headAccessory_special_summerRogue: 'eyewear_special_summerRogue',
    headAccessory_special_summerWarrior: 'eyewear_special_summerWarrior',
    headAccessory_special_wondercon_red: 'eyewear_special_wondercon_red',
    headAccessory_special_wondercon_black: 'eyewear_special_wondercon_black',
  };

    // items.gear.costume, items.gear.equipped:
  _.each(['costume', 'equipped'], function (type) {
    _.each(oldToNew, function (newName, oldName) {
      if (user.items.gear[type].headAccessory === oldName) {
        unset[`items.gear.${type}.headAccessory`] = '';
        set[`items.gear.${type}.eyewear`] = newName;
      }
    });
  });

  // items.gear.owned:
  _.each(oldToNew, function (newName, oldName) {
    if (oldName in user.items.gear.owned) {
      unset[`items.gear.owned.${oldName}`] = '';
      set[`items.gear.owned.${newName}`] = user.items.gear.owned[oldName];
    }
  });

  // console.log(JSON.stringify(user, null, "  "));
  // console.log("set: "   + JSON.stringify(set,   null, "  "));
  // console.log("unset: " + JSON.stringify(unset, null, "  "));

  liveUsers.update({_id: user._id}, {$set: set, $unset: unset, $inc: {_v: 1}});

  if (count % progressCount === 0) console.log(`${count  } ${  user._id}`);
  if (user._id === '9') console.log('lefnire processed');
  if (user._id === authorUuid) console.log(`${authorName  } processed`);
});