package com.weEat.migrations

import org.mongodb.scala.MongoDatabase
import com.weEat.models.{Authorization,User}
import com.weEat.shared.models.FoodNodeId
import com.mongodb.client.model._
import org.mongodb.scala.model.Filters._
import org.mongodb.scala.model.Indexes._
import java.util.concurrent.TimeUnit._
import org.bson.BsonType._
import scala.concurrent.{ExecutionContext,Future}

object InitDb extends Migration {
  // Must be multiple of 256
  val MAX_SIZE_META_DOCUMENT = 256*4

  implicit val ec: ExecutionContext = ExecutionContext.global

  private def typ = `type` _

  def execute(db: MongoDatabase) = Future.sequence(Seq(
    initMetadataCollection(db),
    createFoodCollection(db),
    createUserCollection(db),
    createTokenCollection(db)
  ))

  def initMetadataCollection(db: MongoDatabase) = {
    db.createCollection(Metadata.collectionName, new CreateCollectionOptions()
      .capped(true)
      .maxDocuments(1)
      .sizeInBytes(MAX_SIZE_META_DOCUMENT)
    ).head().map(_ =>
      db.getCollection[Metadata](Metadata.collectionName)
        .insertOne(Metadata())
        .head()
    ).flatten
  }

  def createFoodCollection(db: MongoDatabase) =
    db.createCollection(FoodNodeId.collectionName,
      new CreateCollectionOptions()
    ).head()

  def createUserCollection(db: MongoDatabase) =
    db.createCollection(User.collectionName,
      new CreateCollectionOptions().validationOptions(
        new ValidationOptions().validator(
          and(
            typ("email", STRING),
            typ("password", STRING),
            typ("created", DATE_TIME)
          )
        )
      )
    ).head().map(_ => db.getCollection[User](User.collectionName)
      // TODO: this would be better as hashed
      // Currently ascending because hashed does not support unique
      .createIndex(ascending("email"), new IndexOptions().unique(true)).head()
    ).flatten

  def createTokenCollection(db: MongoDatabase) =
    db.createCollection(Authorization.collectionName,
      new CreateCollectionOptions().validationOptions(
        new ValidationOptions().validator(
          and(
            typ("email", STRING),
            typ("userId", OBJECT_ID),
            typ("accessToken", BINARY),
            typ("refreshToken", BINARY),
            typ("created", DATE_TIME)
          )
        )
      )
    ).head().map(_ =>
      db.getCollection[Authorization](Authorization.collectionName)
        .createIndexes(Seq(
          // TODO: These two would be better as hashed
          // Currently ascending because hashed does not support unique
          new IndexModel(ascending("accessToken"), new IndexOptions()
            .unique(true)),
          new IndexModel(ascending("refreshToken"), new IndexOptions()
            .unique(true)),
          new IndexModel(ascending("created"),new IndexOptions()
            .expireAfter(Authorization.refreshFreshTime.getSeconds(), SECONDS)
          )
        )).head()
    ).flatten
}