utils.js

const { Collection } = require('discord.js')
const config = require('./config.json')

function longFormChannelName(name) {
  const abbrev = name.slice(0, name.indexOf('-'));
  const date = name.slice(name.indexOf('-') + 1)
  const territory = config.territories[abbrev.toUpperCase()]
  return territory + ' ' + date
}

function splitContent(content) {
  const start = `user: `;
  const end = ` missions: `;
  const username = content.split(start)[1].split(end)[0]
  const missions = content.split(end)[1]
  return [username, missions]
}

function countMissions(messages) {
  if (!messages || messages.size === 0) return count = 0

  count = 0

  if (messages.size > 0) {
    messages.forEach(m => {
      missionValue = isNaN(splitContent(m.content)[1]) ? 0 : splitContent(m.content)[1]
      count = +missionValue + +count
    })
  } else {
    missionValue = isNaN(splitContent(messages.content)[1]) ? 0 : splitContent(messages.content)[1]
    count = +missionValue + +count
  }

  return count
}

function wait(time) {
  return new Promise(resolve => {
    setTimeout(resolve, time);
  });
}

function addOrReplace(arr) {
  const res = Array.from(arr.reduce(
    (m, { name, count }) => m.set(name, (m.get(name) || 0) + count), new Map
  ), ([name, count]) => ({ name, count }));
  return res
}

function totalString(total) {
  let stringTotal = ''
  total.forEach(item => {
    stringTotal += item.name + ' : ' + item.count + '\n'
  })
  return stringTotal
}

async function fetchMore(channel, limit = 1000) {
  if (!channel) {
    throw new Error(`Expected channel, got ${typeof channel}.`);
  }
  if (limit <= 100) {
    return channel.messages.fetch({ limit });
  }

  let collection = new Collection();
  let lastId = null;
  let options = {};
  let remaining = limit;

  while (remaining > 0) {
    options.limit = remaining > 100 ? 100 : remaining;
    remaining = remaining > 100 ? remaining - 100 : 0;

    if (lastId) {
      options.before = lastId;
    }

    let messages = await channel.messages.fetch(options);

    if (!messages.last()) {
      break;
    }

    collection = collection.concat(messages);
    lastId = messages.last().id;
  }

  return collection;
}


exports.longFormChannelName = longFormChannelName
exports.splitContent = splitContent
exports.countMissions = countMissions
exports.wait = wait
exports.addOrReplace = addOrReplace
exports.totalString = totalString
exports.fetchMore = fetchMore