package com.sksamuel.avro4s.github

import java.io.ByteArrayOutputStream

import com.sksamuel.avro4s.{Decoder, Encoder, RecordFormat, SchemaFor}
import org.apache.avro.generic.{GenericDatumReader, GenericDatumWriter, GenericRecord}
import org.apache.avro.io.{DecoderFactory, EncoderFactory}
import org.scalatest.funsuite.AnyFunSuite
import org.scalatest.matchers.should.Matchers

case class Label(value: String) extends AnyVal
case class Value[A](label: Label, value: A)

sealed trait OneOrTwo[A]
case class One[A](value: Value[A]) extends OneOrTwo[A]
case class Two[A](first: Value[A], second: Value[A]) extends OneOrTwo[A]
case class OneOrTwoWrapper[A](t: OneOrTwo[A])

object Bug {

  def apply[T <: Product](a: T)(
    implicit schemaFor: SchemaFor[T],
    encoder: Encoder[T],
    decoder: Decoder[T]
  ): Unit = {

    val format = RecordFormat[T]
    val schema = schemaFor.schema
    val datumReader = new GenericDatumReader[GenericRecord](schema)
    val datumWriter = new GenericDatumWriter[GenericRecord](schema)

    val stream = new ByteArrayOutputStream()
    val bEncoder = EncoderFactory.get().binaryEncoder(stream, null)

    datumWriter.write(format.to(a), bEncoder)
    bEncoder.flush()

    val bytes = stream.toByteArray
    val bDecoder = DecoderFactory.get().binaryDecoder(bytes, null)
    val record = datumReader.read(null, bDecoder)
    require(format.from(record) == a)
  }

}

class GithubIssue235 extends AnyFunSuite with Matchers {
  test("Broken typeclass derivation upgrading from 1.9.0 to 2.0.1 #235") {
    val o = OneOrTwoWrapper(One(Value(Label("lbl"), "foo")))
    Bug(o)
  }
}