String scNormalizeCpRelationType(String? relationType) {
  final value = relationType?.trim().toUpperCase() ?? "";
  switch (value) {
    case "BRO":
    case "BROS":
    case "BROTHER":
    case "BROTHERS":
    case "SWORN_BRO":
    case "SWORN_BROS":
    case "SWORN_BROTHER":
    case "SWORN_BROTHERS":
      return "BROTHER";
    case "SIS":
    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 scCpRelationEntryLabel(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 scCpRelationDisplayDays(String? days) {
  final text = days?.trim() ?? "";
  final value = num.tryParse(text.replaceAll(",", ""));
  if (value == null) {
    return text.isEmpty ? "1" : text;
  }
  final displayValue = value + 1;
  if (displayValue % 1 == 0) {
    return displayValue.toInt().toString();
  }
  return displayValue.toString();
}

String scBuildCpRelationNoticeDedupKey({
  required String? action,
  required String? groupId,
  required String? relationType,
  String? explicitKey,
  Iterable<String?> userIds = const <String?>[],
  Iterable<String?> userNames = const <String?>[],
}) {
  final normalizedAction = action?.trim() ?? "";
  final normalizedGroupId = groupId?.trim() ?? "";
  final normalizedRelationType = scNormalizeCpRelationType(relationType);
  final normalizedExplicitKey = explicitKey?.trim() ?? "";
  if (normalizedExplicitKey.isNotEmpty) {
    return [
      "cp_notice",
      normalizedAction,
      normalizedGroupId,
      normalizedRelationType,
      normalizedExplicitKey,
    ].join("|");
  }

  final ids =
      userIds
          .map((value) => value?.trim() ?? "")
          .where((value) => value.isNotEmpty)
          .toList()
        ..sort();
  if (ids.isNotEmpty) {
    return [
      "cp_notice",
      normalizedAction,
      normalizedGroupId,
      normalizedRelationType,
      ...ids,
    ].join("|");
  }

  final names =
      userNames
          .map((value) => value?.trim() ?? "")
          .where((value) => value.isNotEmpty)
          .toList()
        ..sort();
  if (names.isEmpty) {
    return "";
  }
  return [
    "cp_notice",
    normalizedAction,
    normalizedGroupId,
    normalizedRelationType,
    ...names,
  ].join("|");
}

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] ${scBuildCpRelationEntryBroadcastText(ownerName: ownerName, joinedName: joinedName, relationType: relationType)}.";
}

String scBuildCpRelationEntryBroadcastText({
  required String ownerName,
  required String joinedName,
  required String? relationType,
}) {
  return "$ownerName's ${scCpRelationEntryLabel(relationType)} "
      "$joinedName has joined the party";
}