object Config {
  def from(url: String): ConfigBuilder = ???
}

trait ConfigBuilder {
  def overrideWith(url: String): ConfigBuilder
  def overrideWith(props: java.util.Map[_, _]): ConfigBuilder
  def overrideWith(cmdlineArgs: Array[String]): ConfigBuilder

  def param[Type](name: String, description: String, mandatory: Boolean)(implicit mf: Manifest[Type]): ConfigBuilder

  def build(): Config
}

trait Config {
  def readProperties(file: String, env: String = EnvironmentResolver()): ConfigPropeties
  def readText(file: String, env: String = EnvironmentResolver(), encoding: Charset = StandardCharsets.UTF_8): String
  def readFile(file: String, env: String = EnvironmentResolver()): InputStream

  def printHelp(w: PrintStream  = System.out)

  def knownParams(): Set[String]
}

trait ConfigPropeties {
  def props(): Properties
  def map(): Map[String, String]

  def get[Type](key: String): Option[Type]

  def validate(): List[String]
}

object ConfigPropeties {
  implicit def toProperties(confProps: ConfigPropeties): Properties = confProps.props()
}

object EnvironmentResolver {
  def apply() = ???
}