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package s_mach.i18n.messages

import java.util.Locale
import s_mach.i18n.impl._

/**
  * A trait for retrieving message formats from a message key
  */
trait Messages {
  /** @return locale for message formats returned by this messages */
  def locale: Locale

  def keys: Iterable[Symbol]
  def contains(key: Symbol): Boolean
  def get(key: Symbol) : Option[MessageFormat]
  def apply(key: Symbol) : MessageFormat
  def applyOrElse(key: Symbol, default: Symbol => MessageFormat) : MessageFormat
}

object Messages {
  /** @return Create an in-memory messages */
  def apply(
    locale: Locale,
    formats: (Symbol,MessageFormat)*
  ) : Messages =
    new MessagesMap(locale,formats.toMap)

  /** @return a messages that tries m1 and fallsback to m2 if a key is missing */
  def orElse(
    m1: Messages,
    m2: Messages
  ) : Messages =
    OrElseMessages(m1,m2)
}