How to convert Map to case class (recursively)

How to convert Map with nested Map (with key contains name of nested case clas) to case class.

Assuming we have:

case class OuterClass(fieldName1: String, fieldName2: InnerClass)
case class InnerClass(innerFieldName: Int)

How to convert:

Map("fieldName1" -> "stringValue", 
    "name" -> "ClassName", 
    "fieldName2" -> Map(
         "innerFieldName" -> "value", 
         "innerClassName" -> "CaseClassName"))

to the

OuterClass("stringValue", InnerClass("value"))

?