package gs.log.v0

import java.time.Instant
import java.time.LocalDate

/** Type class for data that can be logged by the `gs-log` library.
  */
trait Loggable[A]:
  def renderForLogs(data: A): LogData.Value

object Loggable:

  def apply[A](
    using
    L: Loggable[A]
  ): Loggable[A] = L

  given Loggable[String]  = LogData.Str(_)
  given Loggable[Boolean] = LogData.Bool(_)
  given Loggable[Int]     = LogData.Int32(_)
  given Loggable[Long]    = LogData.Int64(_)
  given Loggable[Float]   = LogData.Float32(_)
  given Loggable[Double]  = LogData.Float64(_)

  /** Default implementation for `java.time.LocalDate`. Uses the default
    * `toString`, which formats the date as `uuuu-MM-dd` (ISO_LOCAL_DATE).
    */
  def forDate(): Loggable[LocalDate] = data => LogData.Str(data.toString())

  /** Default implementation for `java.time.Instant`. Uses the default
    * `toString`, which formats the date using ISO_INSTANT. Produces strings
    * that look like: `2011-12-03T10:15:30Z`
    */
  def forInstant(): Loggable[Instant] = data => LogData.Str(data.toString())
end Loggable