package controllers

import actors.auctions.AuctionPublisher
import controllers.authentication.AuthenticatedAction
import dao.{AuctionsDAO, AuthTokensDAO}
import models.AuctionStatus.Ready
import models.{Auction, User}
import org.apache.pekko.actor.typed.ActorRef
import play.api.libs.functional.syntax.toFunctionalBuilderOps
import play.api.libs.json.*
import play.api.mvc.{BaseController, ControllerComponents}

import javax.inject.{Inject, Singleton}
import scala.concurrent.{ExecutionContext, Future}

@Singleton
class AuctionsController @Inject()(val controllerComponents: ControllerComponents,
                                   val auctionsDAO: AuctionsDAO,
                                   val authTokensDAO: AuthTokensDAO,
                                   authenticatedAction: AuthenticatedAction,
                                   val auctionPublisher: ActorRef[AuctionPublisher.Command],
                                   implicit val ec: ExecutionContext) extends BaseController {
  def index = authenticatedAction.async { implicit request =>
    given Writes[Auction] = auctionWrites(request.user)

    for {
      auctions <- auctionsDAO.list_available(request.user)
      json = Json.toJson(auctions)
    } yield Ok(json)
  }

  def create = authenticatedAction.async(parse.json) { implicit request =>
    val auctionCreateDataResult = request.body.validate[AuctionCreateData]
    auctionCreateDataResult.fold(
      errors => Future.successful(BadRequest(JsError.toJson(errors))),
      auctionCreateData => {
        for {
          auction <- auctionsDAO.create(auctionCreateData.name, auctionCreateData.startingPrice, request.user)
          json = Json.toJson(auction)
          _ = auctionPublisher ! AuctionPublisher.Publish(auction, request.user)
        } yield Created(json)
      }
    )
  }

  private case class AuctionCreateData(name: String, startingPrice: BigDecimal)

  private given Reads[AuctionCreateData] = Json.reads[AuctionCreateData]

  private def auctionWrites(user: User): OWrites[Auction] = (o: Auction) => {
    Json.toJsObject(o)(using Auction.writes) ++ Json.obj(
      "actions" -> Json.obj(
        "bid" -> (
          (o.authorId != user.id.get) &&
            (o.currentBidderId match {
              case None => true // If there's no bidder, we can bid
              case Some(bidderId) => bidderId != user.id.get
            }) &&
            (o.status == Ready)
          )
      )
    )
  }
}