import 'package:flutter/foundation.dart';
import 'package:shared_preferences/shared_preferences.dart';

class GoogleOauthConfig {
  const GoogleOauthConfig({
    this.webClientId = '',
    this.desktopClientId = '',
    this.desktopClientSecret = '',
  });

  final String webClientId;
  final String desktopClientId;
  final String desktopClientSecret;

  bool get hasAndroidConfig => webClientId.trim().isNotEmpty;
  bool get hasWindowsConfig => desktopClientId.trim().isNotEmpty;

  GoogleOauthConfig copyWith({
    String? webClientId,
    String? desktopClientId,
    String? desktopClientSecret,
  }) {
    return GoogleOauthConfig(
      webClientId: webClientId ?? this.webClientId,
      desktopClientId:
          desktopClientId ?? this.desktopClientId,
      desktopClientSecret:
          desktopClientSecret ?? this.desktopClientSecret,
    );
  }
}

class GoogleOauthConfigService {
  GoogleOauthConfigService._();

  static final GoogleOauthConfigService instance =
      GoogleOauthConfigService._();

  static const String _webClientIdKey =
      'youtube_personal.google.web_client_id.v1';
  static const String _desktopClientIdKey =
      'youtube_personal.google.desktop_client_id.v1';
  static const String _desktopClientSecretKey =
      'youtube_personal.google.desktop_client_secret.v1';

  final SharedPreferencesAsync _preferences =
      SharedPreferencesAsync();

  final ValueNotifier<GoogleOauthConfig> config =
      ValueNotifier<GoogleOauthConfig>(
        const GoogleOauthConfig(),
      );

  bool _initialized = false;

  Future<void> initialize() async {
    if (_initialized) {
      return;
    }

    final webClientId =
        await _preferences.getString(_webClientIdKey) ?? '';
    final desktopClientId =
        await _preferences.getString(_desktopClientIdKey) ?? '';
    final desktopClientSecret =
        await _preferences.getString(
          _desktopClientSecretKey,
        ) ??
        '';

    config.value = GoogleOauthConfig(
      webClientId: webClientId,
      desktopClientId: desktopClientId,
      desktopClientSecret: desktopClientSecret,
    );

    _initialized = true;
  }

  Future<void> saveAndroid({
    required String webClientId,
  }) async {
    final value = webClientId.trim();

    if (value.isEmpty) {
      await _preferences.remove(_webClientIdKey);
    } else {
      await _preferences.setString(
        _webClientIdKey,
        value,
      );
    }

    config.value = config.value.copyWith(
      webClientId: value,
    );
  }

  Future<void> saveWindows({
    required String desktopClientId,
    required String desktopClientSecret,
  }) async {
    final clientId = desktopClientId.trim();
    final clientSecret = desktopClientSecret.trim();

    if (clientId.isEmpty) {
      await _preferences.remove(_desktopClientIdKey);
    } else {
      await _preferences.setString(
        _desktopClientIdKey,
        clientId,
      );
    }

    if (clientSecret.isEmpty) {
      await _preferences.remove(
        _desktopClientSecretKey,
      );
    } else {
      await _preferences.setString(
        _desktopClientSecretKey,
        clientSecret,
      );
    }

    config.value = config.value.copyWith(
      desktopClientId: clientId,
      desktopClientSecret: clientSecret,
    );
  }
}