const { tmpdir } = require("os")
const { join } = require("path")
const uuid = require("uuid/v1")
const { take, takeRight, last } = require("lodash/fp")
const { splitKey, $, joinKey } = require("@budibase/core").common
const {
  unzipTarGzPackageToRuntime,
} = require("../../utilities/targzAppPackage")
const {
  getRuntimePackageDirectory,
  determineVersionId,
} = require("../../utilities/runtimePackages")
const { pathExists } = require("fs-extra")
const createInstanceDb = require("../../initialise/createInstanceDb")
const { createWriteStream } = require("fs")
const { applictionVersionPackage } = require("../../utilities/createAppPackage")
const { getApisWithFullAccess } = require("../../utilities/budibaseApi")

module.exports = context => {
  const { config } = context
  const datastoreModule = require(`../../../datastores/datastores/${config.datastore}`)
  return {
    initialiseInstance: async ({ instance, apis }) => {
      const appKey = $(instance.key, [splitKey, take(2), joinKey])

      const application = await apis.recordApi.load(appKey)

      const versionId = determineVersionId(instance.version)

      const runtimeDir = getRuntimePackageDirectory(
        context,
        application.name,
        versionId
      )

      if (!(await pathExists(runtimeDir)))
        await downloadAppPackage(
          context,
          apis,
          instance,
          application.name,
          versionId
        )

      const dbConfig = await createInstanceDb(
        context,
        datastoreModule,
        application,
        instance
      )

      instance.datastoreconfig = JSON.stringify(dbConfig)
      instance.isNew = false
      instance.transactionId = ""

      await apis.recordApi.save(instance)
    },

    createNewUser: async ({ user, apis }) => {
      if (!user.createdByMaster) return

      const instance = await apis.recordApi.load(user.instance.key)

      const appKey = $(instance.key, [splitKey, take(2), joinKey])

      const application = await apis.recordApi.load(appKey)

      const versionId = determineVersionId(instance.version)

      const appPackage = await applictionVersionPackage(
        context,
        application.name,
        versionId,
        instance.key
      )

      const instanceApis = await getApisWithFullAccess(
        datastoreModule.getDatastore(JSON.parse(instance.datastoreconfig)),
        appPackage
      )

      const authUser = instanceApis.authApi.getNewUser()
      authUser.name = user.name
      authUser.accessLevels = [instance.version.defaultAccessLevel]

      await instanceApis.authApi.createUser(authUser)
    },

    setDefaultVersion: async ({ apis, version }) => {
      const appKey = $(version.key, [splitKey, take(2), joinKey])

      const application = await apis.recordApi.load(appKey)

      if (application.defaultVersion.key) return

      application.defaultVersion = version

      await apis.recordApi.save(application)
    },
  }
}

const downloadAppPackage = async (
  context,
  apis,
  instance,
  appName,
  versionId
) => {
  const inputStream = await apis.recordApi.downloadFile(
    instance.version.key,
    "package.tar.gz"
  )

  const tempFilePath = join(tmpdir(), `bbpackage_${uuid()}.tar.gz`)
  const outputStream = createWriteStream(tempFilePath)

  await new Promise((resolve, reject) => {
    inputStream.pipe(outputStream)
    outputStream.on("error", reject)
    outputStream.on("finish", resolve)
  })

  await unzipTarGzPackageToRuntime(context, tempFilePath, appName, versionId)
}