Prepare custom fields

modules/common/src/main/scala/docspell/common/CustomFieldType.scala

@@ -0,0 +1,51 @@
+package docspell.common
+
+import io.circe._
+
+sealed trait CustomFieldType { self: Product =>
+
+  final def name: String =
+    self.productPrefix.toLowerCase()
+
+}
+
+object CustomFieldType {
+
+  case object Text extends CustomFieldType
+
+  case object Numeric extends CustomFieldType
+
+  case object Date extends CustomFieldType
+
+  case object Bool extends CustomFieldType
+
+  case object Money extends CustomFieldType
+
+  def text: CustomFieldType    = Text
+  def numeric: CustomFieldType = Numeric
+  def date: CustomFieldType    = Date
+  def bool: CustomFieldType    = Bool
+  def money: CustomFieldType   = Money
+
+  val all: List[CustomFieldType] = List(Text, Numeric, Date, Bool, Money)
+
+  def fromString(str: String): Either[String, CustomFieldType] =
+    str.toLowerCase match {
+      case "text"    => Right(text)
+      case "numeric" => Right(numeric)
+      case "date"    => Right(date)
+      case "bool"    => Right(bool)
+      case "money"   => Right(money)
+      case _         => Left(s"Unknown custom field: $str")
+    }
+
+  def unsafe(str: String): CustomFieldType =
+    fromString(str).fold(sys.error, identity)
+
+
+  implicit val jsonDecoder: Decoder[CustomFieldType] =
+    Decoder.decodeString.emap(fromString)
+
+  implicit val jsonEncoder: Encoder[CustomFieldType] =
+    Encoder.encodeString.contramap(_.name)
+}