let migrationName = '20140914_upgrade_admin_contrib_tiers';
let authorName = 'Alys'; // in case script author needs to know when their ...
let authorUuid = 'd904bd62-da08-416b-a816-ba797c9ee265'; // ... own data is done

/**
 * https://github.com/HabitRPG/habitrpg/issues/3801
 * Convert Tier 8 contributors to Tier 9 (staff) (all current Tier 8s are admins).
 * Convert Tier 7 contributors with admin flag to Tier 8 (moderators).
 */

// 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

let mongo = require('mongoskin');
let _ = require('lodash');

let dbUsers = mongo.db('localhost:27017/habitrpg?auto_reconnect').collection('users');

let query =
  { 'contributor.level': {$gte: 7}, 'contributor.admin': true, migration: {$ne: migrationName} };

let fields = {migration: 1,
              'contributor.admin': 1,
              'contributor.level': 1,
              'auth.local.username': 1,
              'profile.name': 1,
};

let userResults = {}; // each key is a UUID, each value is a username;
// contains only the users changed

console.warn('Updating users...');
let progressCount = 1000;
let count = 0;
dbUsers.findEach(query, fields, {batchSize: 250}, function (err, user) {
  if (err) {
    return exiting(1, `ERROR! ${  err}`);
  }
  if (!user) {
    console.warn('All appropriate users found and modified.');
    return displayData();
  }
  count++;

  let set = {migration: migrationName};
  let inc = {'contributor.level': 1, _v: 1};

  userResults[user._id] = user.profile.name;

  dbUsers.update({_id: user._id}, {$set: set, $inc: inc});

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


function displayData () {
  console.log('users modified:');
  _.each(userResults, function (name, uuid) {
    console.log(name);
  });
  console.warn(`\n${  count
  } users processed (should be 11 according to the Hall)\n`);
  return exiting(0);
}


function exiting (code, msg) {
  code = code || 0; // 0 = success
  if (code && !msg) {
    msg = 'ERROR!';
  }
  if (msg) {
    if (code) {
      console.error(msg);
    } else      {
      console.log(msg);
    }
  }
  process.exit(code);
}