String scNormalizeCpRelationType(String? relationType) {
  final value = relationType?.trim().toUpperCase() ?? "";
  switch (value) {
    case "BROTHER":
    case "BROTHERS":
    case "SWORN_BROTHER":
    case "SWORN_BROTHERS":
      return "BROTHER";
    case "SISTER":
    case "SISTERS":
      return "SISTERS";
    default:
      return "CP";
  }
}

String scCpRelationBecomeLabel(String? relationType) {
  switch (scNormalizeCpRelationType(relationType)) {
    case "BROTHER":
      return "sworn brothers";
    case "SISTERS":
      return "sisters";
    default:
      return "a CP";
  }
}

String scCpRelationPossessiveLabel(String? relationType) {
  switch (scNormalizeCpRelationType(relationType)) {
    case "BROTHER":
      return "brother";
    case "SISTERS":
      return "sister";
    default:
      return "CP";
  }
}

String scCpRelationDialogTitle(String? relationType) {
  switch (scNormalizeCpRelationType(relationType)) {
    case "BROTHER":
      return "Become sworn brothers";
    case "SISTERS":
      return "Become sisters";
    default:
      return "Become a couple";
  }
}

String scBuildCpRelationEstablishedNotice({
  required String userName1,
  required String userName2,
  required String? relationType,
}) {
  return "[System Notification] $userName1 and $userName2 have become "
      "${scCpRelationBecomeLabel(relationType)}.";
}

String scBuildCpRelationJoinNotice({
  required String ownerName,
  required String joinedName,
  required String? relationType,
}) {
  return "[System Notification] $ownerName's "
      "${scCpRelationPossessiveLabel(relationType)}, $joinedName, "
      "has joined the party.";
}