import 'package:flutter_riverpod/flutter_riverpod.dart';
import '../llm/model_download_service.dart';
import 'settings_provider.dart';

// ── Is the model file present on disk? ───────────────────────────────────────

final modelPresentProvider = FutureProvider<bool>((ref) {
  return ModelDownloadService().isModelPresent();
});

// ── Has the user chosen to skip the model requirement? ───────────────────────

class _SkipNotifier extends Notifier<bool> {
  @override
  bool build() => false;
  void skip() => state = true;
}

final modelSkippedProvider =
    NotifierProvider<_SkipNotifier, bool>(_SkipNotifier.new);

// ── Scan notifier — checks for the model on demand ────────────────��──────────

class ModelScanNotifier extends Notifier<AsyncValue<bool>> {
  @override
  AsyncValue<bool> build() => const AsyncData(false);

  Future<void> scan() async {
    state = const AsyncLoading();
    final next = await AsyncValue.guard(
      () => ModelDownloadService().isModelPresent(),
    );
    if (!ref.mounted) return;
    next.whenData((present) async {
      if (present) {
        await ref.read(settingsNotifierProvider.notifier).markModelDownloaded();
        ref.invalidate(modelPresentProvider);
      } else {
        state = AsyncError(
          Exception('Model file not found at expected path'),
          StackTrace.current,
        );
      }
    });
    if (next is AsyncError) state = next;
  }

  void skipToApp() => ref.read(modelSkippedProvider.notifier).skip();
}

final modelScanProvider =
    NotifierProvider.autoDispose<ModelScanNotifier, AsyncValue<bool>>(
        ModelScanNotifier.new);