import 'package:flutter_riverpod/flutter_riverpod.dart';

import 'auth_provider.dart' show localDbProvider;

const aiConsentVersion = 'ai-data-consent-v1';

class AiConsentState {
  final bool isLoading;
  final bool granted;
  final String? userId;

  const AiConsentState({
    this.isLoading = true,
    this.granted = false,
    this.userId,
  });

  AiConsentState copyWith({bool? isLoading, bool? granted, String? userId}) {
    return AiConsentState(
      isLoading: isLoading ?? this.isLoading,
      granted: granted ?? this.granted,
      userId: userId ?? this.userId,
    );
  }
}

final aiConsentProvider = NotifierProvider<AiConsentNotifier, AiConsentState>(
  AiConsentNotifier.new,
);

class AiConsentNotifier extends Notifier<AiConsentState> {
  @override
  AiConsentState build() => const AiConsentState();

  String _key(String userId) => '$aiConsentVersion:$userId';

  Future<void> load(String userId) async {
    state = AiConsentState(isLoading: true, userId: userId);
    final value = await ref.read(localDbProvider).read(_key(userId));
    state = AiConsentState(
      isLoading: false,
      granted: value == 'granted',
      userId: userId,
    );
  }

  Future<void> grant(String userId) async {
    await ref.read(localDbProvider).write(_key(userId), 'granted');
    state = AiConsentState(isLoading: false, granted: true, userId: userId);
  }

  Future<void> revoke(String userId) async {
    await ref.read(localDbProvider).delete(_key(userId));
    state = AiConsentState(isLoading: false, granted: false, userId: userId);
  }
}