import kotlin.reflect.KProperty

inline fun <T1, T2, R> BsonReader.read(
  prop1: KProperty<T1>,
  prop2: KProperty<T2>,
  noinline read1: BsonReader.(BsonType) -> T1,
  noinline read2: BsonReader.(BsonType) -> T2,
  create: (T1, T2) -> R
): R {

  readStartDocument()
  val name1 = prop1.encodedName
  val name2 = prop2.encodedName

  val val1: T1 = readProperty(name1, read1)
  val val2: T2 = readProperty(name2, read2)

  readEndDocument()
  return create(val1, val2)
}


tailrec fun <T> BsonReader.readProperty(
  propName: String,
  read: BsonReader.(BsonType) -> T
): T {
  val type = readBsonType()
  if (type == BsonType.END_OF_DOCUMENT) error("could not find $propName in document")

  return when (val currentName = readName()) {
    propName -> read(type)
    "_id"    -> {
      readObjectId()
      readProperty(propName, read)
    }
    else     -> error("unknown field name: $currentName")
  }
}

//region dummy implementations
val <T> KProperty<T>.encodedName get() = ""

interface BsonReader

enum class BsonType {
  END_OF_DOCUMENT
}

fun readBsonType(): BsonType {}
fun readStartDocument(): BsonType {}
fun readName(): String {}
fun readObjectId(): String {}
fun readEndDocument(): String {}
//endregion