We-Eat/server/app/com/weEat/controllers/ViewController.scala

package com.weEat.controllers

import javax.inject._
import play.api.mvc._
import com.weEat.services.MongoDBService
import com.weEat.models.User
import scala.concurrent.Future
import org.bson.types.ObjectId

/**
 * This controller creates an `Action` to handle HTTP requests to the
 * application's home page.
 */
@Singleton
class ViewController @Inject()(
  val controllerComponents: ControllerComponents,
  db: MongoDBService
) (implicit
  val webJarsUtil: org.webjars.play.WebJarsUtil
) extends BaseController {

  implicit val ec = scala.concurrent.ExecutionContext.global

  private var initialized = false

  private def _is_initialized: Future[Boolean] = {
    if (initialized) Future.successful(true)
    else db.withCollection(User) { (users) =>
      import org.mongodb.scala.model.Filters._
      users.find(equal("isAdmin", true)).head()
    }.flatten.map({ (user) =>
      initialized = user != null
      initialized
    })
  }

  def initalizer() = Action.async { implicit request: Request[AnyContent] =>
    _is_initialized map {
      case true  => MovedPermanently(routes.ViewController.loader("").url)
      case false => Ok(views.html.initalizer())
    }
  }

  // Basically everything about this function is a special case.
  // I don't like it, but it is unique among every other bit of functionality.
  def initalize() = Action.async(parse.formUrlEncoded) {
    implicit request: Request[Map[String, Seq[String]]] =>
    // First verify that we haven't already been initialized
    db.withCollection(User) { (users) =>
      import org.mongodb.scala.model.Filters._
      import com.github.t3hnar.bcrypt.BCryptStrOps
      users.find(equal("isAdmin", true)).head().flatMap {
        case null => users.insertOne(User(
          new ObjectId,
          request.body("fname")(0),
          request.body("lname")(0),
          request.body("email")(0),
          request.body("password")(0).boundedBcrypt,
          isAdmin = true
        )).head()
        case existingAdmin => Future.successful(existingAdmin)
      }
    }.flatten.map({ (_) =>
      initialized = true;
      MovedPermanently(routes.ViewController.loader("").url)
    })
  }

  def loader(s: String) = Action.async { implicit request: Request[AnyContent] =>
    _is_initialized map {
      case true  => Ok(views.html.viewLoader())
      case false => TemporaryRedirect(routes.ViewController.initalizer().url)
    }
  }
}