import "package:flutter_riverpod/flutter_riverpod.dart";

import "package:smol_mail/smol/address.dart";
import "package:smol_mail/smol/client.dart";
import "package:smol_mail/smol/store.dart";

/// Overridden in main() with the Hive-backed store opened at boot.
final storeProvider = Provider<SmolStore>((ref) => throw UnimplementedError());

final clientProvider = Provider<SmolClient>(
  (ref) => SmolClient(ref.watch(storeProvider)),
);

/// Hive gives no change notifications; every mail or state mutation bumps this,
/// which is what the list, badge, identity and account providers watch.
class Revision extends Notifier<int> {
  @override
  int build() => 0;

  void bump() => state++;
}

final revisionProvider = NotifierProvider<Revision, int>(Revision.new);

final identityProvider = Provider<SmolIdentity?>((ref) {
  ref.watch(revisionProvider);
  return ref.watch(storeProvider).identity();
});

final accountProvider = Provider<SmolAddress?>((ref) {
  ref.watch(revisionProvider);
  return ref.watch(clientProvider).accountAddress();
});

/// One tab (Inbox/Sent/Requests) can be on screen — and simultaneously kept
/// alive off-screen by [TabBarView] for swiping — while another is active,
/// so each is parameterized by its own folder rather than sharing one
/// ambient "current folder" provider.
final messagesForFolderProvider =
    Provider.family<List<MailRecord>, String>((ref, folder) {
  ref.watch(revisionProvider);
  return ref.watch(storeProvider).listMessages(folder);
});

final unreadProvider = Provider<int>((ref) {
  ref.watch(revisionProvider);
  return ref.watch(storeProvider).unreadCount();
});

final requestsUnreadProvider = Provider<int>((ref) {
  ref.watch(revisionProvider);
  return ref.watch(storeProvider).requestsUnreadCount();
});

final contactsProvider = Provider<List<(String, StoredContact)>>((ref) {
  ref.watch(revisionProvider);
  return ref.watch(storeProvider).allContacts();
});