/// CCC Key-Derivation Function (KDF) definitions and helpers.
///
/// This module owns:
/// - stable int-backed KDF identifiers for persistence,
/// - normalization/parsing helpers,
/// - conversion from persisted int to enum.
///
/// Keeping this in `ccc/` preserves separation of concerns so data models remain
/// focused on storage shape only.
enum CccKdfFunction {
  sha256(1),
  sha384(2),
  sha512(3),
  blake2b512(4);

  final int value;
  const CccKdfFunction(this.value);
}

/// Default persisted KDF selector.
const int cccDefaultKdfFunctionValue = 1;

/// Normalize arbitrary input to a supported KDF function int value.
int normalizeCccKdfFunctionValue(dynamic raw) {
  final parsed = raw is int ? raw : int.tryParse(raw?.toString() ?? '');
  if (parsed == null) return cccDefaultKdfFunctionValue;

  for (final option in CccKdfFunction.values) {
    if (option.value == parsed) return parsed;
  }
  return cccDefaultKdfFunctionValue;
}

/// Resolve an enum value from persisted int representation.
CccKdfFunction cccKdfFunctionFromInt(int raw) {
  for (final option in CccKdfFunction.values) {
    if (option.value == raw) return option;
  }
  return CccKdfFunction.sha256;
}