// Address forms (SPEC.md §3): parsing goes through the native library, so
// the username rules are fumi's, not a reimplementation that can drift.

import "package:smol_mail/native/ffi.dart";
import "package:smol_mail/smol/errors.dart";

/// One parsed address. [identity] carries the self-certifying key a
/// smol:// URI binds; a short form has none until it is resolved.
class SmolAddress {
  final String user;
  final String host;
  final int port;
  final String? identity;
  final bool rns;

  const SmolAddress(this.user, this.host, this.port,
      {this.identity, this.rns = false});

  /// The short form a contact list shows; the default port is elided.
  String get short => rns
      ? "smol+rns://$user@$host"
      : "$user@$host${port == defaultPort ? "" : ":$port"}";

  /// The self-certifying form: the key inside makes the address verifiable.
  String uri(String publicKey) => rns
      ? "smol+rns://$user@$host/$publicKey"
      : "smol://$user@$host${port == defaultPort ? "" : ":$port"}/$publicKey";
}

const defaultPort = 1961;

/// Parses any of the four address forms. Throws [SmolError] on anything
/// else — the onboarding and compose fields validate through this.
SmolAddress parseAddress(String text) {
  final Map<String, dynamic> parsed;
  try {
    parsed = SmolFfi.open().parseAddress(text.trim());
  } on NativeSmolException catch (err) {
    throw SmolError(err.message);
  }
  return SmolAddress(
    parsed["user"] as String,
    parsed["host"] as String,
    parsed["port"] as int,
    identity: parsed["identity"] as String?,
    rns: parsed["scheme"] == "rns",
  );
}