package com.weEat.controllers

import com.weEat.models.{FoodNode => FoodNodeCollection}
import com.weEat.models.{RecipeVersion => RecipeVersionCollection}
import com.weEat.models.FoodNodeView
import com.weEat.services.MongoDBService
import com.weEat.shared.models._
import javax.inject.{Inject,Singleton}
import play.api.libs.json._
import play.api.mvc._
import org.bson.types.ObjectId
import org.mongodb.scala.model.Filters._
import scala.concurrent.Future
import scala.util.{Success,Failure}
import com.weEat.models.Authorization
import scalaoauth2.provider.{AuthInfoRequest,OAuth2ProviderActionBuilders}
import com.weEat.services.OAuth2Service

@Singleton
class FoodController @Inject()(
  val controllerComponents: ControllerComponents,
  oauth: OAuth2Service,
  db: MongoDBService
) extends BaseController
    with OAuth2ProviderActionBuilders {
  implicit val ec = scala.concurrent.ExecutionContext.global

  import db.withCollection

  def get(id: String) = Action.async
  { implicit request: Request[AnyContent] =>
    withCollection(FoodNodeView) { (collection) =>
      collection.find(equal("_id", new ObjectId(id)))
        .first()
        .toFuture()
        .transform({
          case Success(null) => Success(NotFound(id))
          case Success(x) => Success(Ok(Json.toJson(x)))
          case Failure(x) => throw x
        })
    }.flatten
  }

  def all() = Action.async
  { implicit request: Request[AnyContent] =>
    withCollection(FoodNodeView) { (collection) =>
      collection.find()
        .toFuture()
        .transform({
          case Success(x) => Success(Ok(Json.toJson(x)))
          case Failure(x) => throw x
        })
    }.flatten
  }

  def query(q: String) = Action.async
  { implicit request: Request[AnyContent] =>
    findByName(q).transform({
      case Success(x) => Success(Ok(Json.toJson(x)))
      case Failure(x) => throw x
    })
  }

  def findByName(q: String): Future[Seq[FoodNodeId]] =
    withCollection(FoodNodeView) { (collection) =>
      collection.find(regex("name", q, "i")).toFuture()
    }.flatten

  def getByFdcId(fdcId: Long): Future[Option[USDANodeId]] =
    withCollection(FoodNodeView) { (collection) =>
      collection.find(equal("fdcId", fdcId))
        .first()
        .toFuture()
        .map((foodNode) => Option(foodNode.asInstanceOf[USDANodeId]))
    }.flatten

  // def getImage(foodId: String, idx: Int) = Action.async
  // { implicit request: Request[AnyContent] =>
  //   withCollection(FoodImages) {collection =>
  //     collection.find(and(equal("food", foodId), equal("index", idx)))
  //       .first()
  //       .toFuture()
  //       .transform({
  //         case Success(img) =>
  //           Success(Ok.streamed(img.data, img.data.length, img.mime))
  //         case Failure(x) => throw x
  //       })
  //   }.flatten
  //   ???
  // }

  // def addImageTo(id: String) = Action.async(parse.byteString)
  // { implicit request: Request[ByteString] =>
    // withCollection(FoodImages) { images =>
    //   images.insertOne(FoodImage(None, id, , request.body, request.contentType.get))
    //     .head().transformWith({
    //       case Success(img) => withCollection(FoodNode) { foods =>
    //         foods.findOneAndUpdate(
    //           equal("id", id),
    //           push("imageIds", img._id.get)
    //         ).head().transform({
    //           case Success(x) => Success(Ok(x))
    //           case Failure(x) =>
    //             images.deleteOne(eq("_id", img._id.get))
    //             throw x
    //         })
    //       }
    //       case Failure(x) => throw x
    //     })
    // }.flatten

  //   ???
  // }

  // def deleteImage(foodId: String, imageId: String) = Action.async
  // { implicit request: Request[AnyContent] =>
  //   withCollection(FoodNode) { foods =>
  //     foods.findOneAndUpdate(
  //       equal("id", foodId),
  //       pull("imageIds", imageId)
  //     ).head().transformWith({
  //       case Success(x) => images.deleteOne(eq("_id", img._id.get))
  //           .head().transform({
  //             case Success(x) => Success(Ok(x))
  //             case Failure(x) => throw x
  //           })
  //       case Failure(x) => throw x
  //     })
  //   }.flatten

  //   ???
  // }

  def add(uid: Option[String]) = AuthorizedAction[Authorization](oauth)
    .async(parse.json)
  { implicit request: AuthInfoRequest[JsValue, Authorization] =>
    try {
      val food = request.body.as[FoodNode].withId(
        new ObjectId,
        uid.flatMap({ (id) =>
          if (request.authInfo.user.hasAdminPermissions) Some(new ObjectId(id))
          else None
        }).getOrElse(request.authInfo.user.userId)
      )

      (food match {
        case recipeNode: RecipeNodeId => _addRecipe(recipeNode)
        case node => _addFood(node)
      }).map((food) => Ok(Json.toJson(food.asInstanceOf[FoodNodeId])))
    }
    catch {
      case _: JsResultException => Future.successful(
        BadRequest(s"Could not parse json into a Food node.")
      )
    }
  }

  private def _addRecipe(node: RecipeNodeId) = {
    val (metaNode, versNode) = RecipeMetaNodeId(node)
    _addFood(metaNode, (_) => _saveVersionIfRecipe(versNode))
      .map((_) => node)
  }

  private def _addFood(
    node: FoodId,
    callback: (FoodId) => Future[FoodId] = Future.successful _
  ) = withCollection(FoodNodeCollection) { (collection) =>
    collection.insertOne(node).map({ (res) => node }).head()
  }.flatten
    .flatMap(callback)

  private def _saveVersionIfRecipe(node: RecipeNodeId): Future[FoodNodeId] =
    withCollection(RecipeVersionCollection) { (collection) =>
      collection.insertOne(node).map({ (res) => node }).head()
    }.flatten

  def update(id: String, uid: Option[String]) =
    AuthorizedAction[Authorization](oauth)
      .async(parse.json)
  { implicit request: AuthInfoRequest[JsValue, Authorization] =>
    try {
      val food = request.body.as[FoodNode].withId(
        new ObjectId(id),
        uid.flatMap({ (uid) =>
          if (request.authInfo.user.hasAdminPermissions) Some(new ObjectId(uid))
          else None
          // tflucke@[2023-10-07] Should this query for the current uid instead?
        }).getOrElse(request.authInfo.user.userId)
      )

      (food match {
        case recipeNode: RecipeNodeId => _updateRecipe(recipeNode)
        case node => _updateFood(node)
      }).map((food) => Ok(Json.toJson(food.asInstanceOf[FoodNodeId])))
    }
    catch {
      case _: JsResultException => Future.successful(
        BadRequest(s"Could not parse json into a Food node.")
      )
    }
  }

  private def _updateRecipe(node: RecipeNodeId) = {
    val (metaNode, versNode) = RecipeMetaNodeId(node)
    _updateFood(metaNode, (_) => _saveVersionIfRecipe(versNode))
      .map((_) => node)
  }

  private def _updateFood(
    node: FoodId,
    callback: (FoodId) => Future[FoodId] = Future.successful _
  ) = withCollection(FoodNodeCollection) { (collection) =>
    collection.replaceOne(and(
      equal("_id", node._id),
      equal("uid", node.uid)
    ), node)
      .head()
      .transform({
        case Success(res) if (res.getModifiedCount > 0) => Success(node)
        case Success(res) => Failure(new NoSuchElementException("User " +
            s"${node.uid} does not have a food node ${node._id}"))
        case Failure(e) => Failure(e)
      })
  }.flatten
    .flatMap(callback)
}