UntypedDestination.scala

/*
 * Copyright 2014–2019 SlamData Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package quasar.api.destination

import argonaut.CodecJson
import argonaut.Argonaut.{UnitDecodeJson, UnitEncodeJson}

import cats.{Eq, Show}
import cats.data.NonEmptyList

import quasar.api.table.ColumnType

import scodec.Codec

import scala.{sys, List, Nil, Nothing, Unit}
import scala.util.Right

trait UntypedDestination[F[_]] extends Destination[F] {
  type Type = Unit
  type Constructor = Nothing

  implicit val showType: Show[Unit] = Show[Unit]

  implicit val eqType: Eq[Unit] = Eq[Unit]

  implicit val codecType: Codec[Unit] = Codec[Unit]

  implicit val jsonCodecType: CodecJson[Unit] =
    CodecJson[Unit](UnitEncodeJson.encode, UnitDecodeJson.decode)

  implicit val eqConstructor: Eq[Nothing] =
    Eq.by[Nothing, Nothing](_ => sys.error("impossible"))

  implicit val jsonCodecConstructor: CodecJson[Nothing] =
    CodecJson[Nothing](_ => sys.error("impossible"), _ => sys.error("impossible"))

  val types = List(())

  val constructors = Nil

  def coerce(tpe: ColumnType) =
    TypeCoercion.Satisfied(NonEmptyList.one(Right(())))
}