// google_sign_in_provider.dart - 非機能のため簡易実装
import 'package:flutter/material.dart';
import '../database_helper.dart';

class GoogleSignInProvider {
  static final GoogleSignInProvider instance = GoogleSignInProvider._init();

  factory GoogleSignInProvider() => instance;

  GoogleSignInProvider._init();

  void signOut(BuildContext context) {}

  Stream<GoogleSignInAccount?>? get authStateChanges => null;

  Future<void> signIn() async {}

  bool get isSignedIn => false;

  List<GoogleSignInAccount>? get accounts => null;

  GoogleSignInAccount? get user => null;

  Future<String> buildInfo() async {
    try {
      final db = await DatabaseHelper.instance.database;
      final count = await db.rawQuery('SELECT COUNT(*) FROM customers');
      return '顧客数：${count.first[0]}';
    } catch (e) {
      return 'エラー: $e';
    }
  }

  Future<void> signOutAccount(BuildContext context) async {}

  void signInAnonymously(BuildContext context) {}

  bool isValid() => true;
}

class GoogleSignInAuthError {
  const GoogleSignInAuthError({required this.code, required this.message});
  final String code;
  final String message;
}