import { MongoClient } from 'mongodb'

main()

async function main() {
  const client = await connectToDatabase()
  const newPatch = await fetchLatestPatch()

  console.log('Latest patch is: ' + newPatch)

  const newDate = new Date()
  if (!(await compareLatestSavedPatch(client, newPatch, newDate))) {
    downloadAssets()
  }

  await client.close()
}

async function fetchLatestPatch() {
  const url = 'https://ddragon.leagueoflegends.com/api/versions.json'
  const patchDataResponse = await fetch(url)
  const patchData = await patchDataResponse.json()
  const patch: string = patchData[0]
  return patch
}

async function connectToDatabase() {
  // Create a MongoClient with a MongoClientOptions object to set the Stable API version
  let uri = `mongodb://${process.env.MONGO_USER}:${process.env.MONGO_PASS}@${process.env.MONGO_HOST}`
  if (
    process.env.MONGO_URI != undefined &&
    process.env.MONGO_URI != null &&
    process.env.MONGO_URI != ''
  ) {
    uri = process.env.MONGO_URI
  }
  const client = new MongoClient(uri)
  await client.connect()
  return client
}

async function compareLatestSavedPatch(client: MongoClient, newPatch: string, newDate: Date) {
  const database = client.db('patches')
  const patches = database.collection('patches')
  const latestPatch = await patches.find().limit(1).sort({ date: -1 }).next()

  if (latestPatch == null) {
    console.log('No previous patch recorded in database.')
  } else {
    console.log('Latest patch in database is: ' + latestPatch.patch)
  }

  if (latestPatch == null || latestPatch.patch != newPatch) {
    await patches.insertOne({ patch: newPatch, date: newDate })
    return false
  }

  return true
}

async function downloadAssets() {}