const fs = require('fs/promises')
const path = require('path')
const nbt = require('prismarine-nbt')
const PlayerData = require('../util/player_data')
const fileExists = require('../util/file_exists')
const getOfflineUUID = require('../util/offline_player_uuid')

const playerData = {}

async function inject (bot) {
  const persistentDir = bot.paths.persistent
  const playerDataDir = path.join(persistentDir, 'playerdata')

  bot.playerData = playerData
  bot.loadPlayerData = loadPlayerData

  bot.on('player_added', handlePlayerAdded)

  async function handlePlayerAdded (player) {
    if (player.uuid === bot.uuid) return

    let data = playerData[player.uuid]

    if (data) {
      data._bots.add(bot)
      return
    }

    data = await loadPlayerData(player.username)
    data._bots.add(bot)

    playerData[player.uuid] = data
    data.data.username = player.username
    bot.emit('player_data_loaded', player, data)
  }

  async function loadPlayerData (uuid) {
    if (uuid.length <= 16) {
      // Usernames
      uuid = getOfflineUUID(uuid)
    }

    const data = new PlayerData(path.join(playerDataDir, uuid.substring(0, 2) + '/' + uuid.substring(2) + '.dat'))
    await data.load()
    return data
  }

  bot.on('player_removed', async player => {
    const data = playerData[player.uuid]
    if (!data) return

    data._bots.delete(bot)
    if (data._bots.size) return

    bot.emit('player_data_unloading', player, data)

    try {
      await data.unload(true)
    } catch (error) {
      console.error('Failed to unload data for player %s (%s):', data?.data?.username, data?.filename, error)
      try {
        console.error('Contents:', JSON.stringify(data))
      } catch {
        console.log('Unable to print contents')
      }
    }
    delete bot.playerData[player.uuid]
  })
}

async function saveAll () {
  console.log('Saving player data...')
  for (const uuid in playerData) {
    const data = playerData[uuid]
    if (!data?.data) {
      // We *somehow* found some unloaded data
      delete playerData[uuid]
      continue
    }

    try {
      await data.save()
    } catch (error) {
      console.error('Unable to write data for player %s (%s):', data?.data?.username, data?.filepath, error)
    }
  }
  console.log('Saved!')
}
setInterval(saveAll, 60 * 3 * 1000)

module.exports = inject