package gs.config.v0.source

import cats.effect.Sync
import gs.config.v0.ConfigKey

/** Environment variable implementation of [[ConfigSource]]. Pulls all values
  * from the system environment that was passed to this process.
  */
final class EnvironmentConfigSource[F[_]: Sync] extends ConfigSource[F]:

  /** @inheritDocs
    */
  override def getValue(
    key: ConfigKey[?]
  ): F[Option[String]] =
    Sync[F].delay(sys.env.get(key.name.toEnvironmentVariable()))

  /** @inheritDocs
    */
  override val name: String = "environment"