// routing_reconnect_test.dart — Task 9:分流档案保存成功后,若当前连接态为 on,
// 应触发一次重连(disconnect→connect)使新规则生效;off 态不触发。
//
// 复用 routing_provider_test.dart 的登录桩 + connection_controller_test.dart /
// flow_connect_test.dart 的连接驱动范式(VpnBridgeMock + MockClient 假 fetchConfig)。
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:http/http.dart' as http;
import 'package:http/testing.dart';
import 'package:pangolin_vpn/bridge/vpn_bridge_mock.dart';
import 'package:pangolin_vpn/bridge/vpn_bridge_provider.dart';
import 'package:pangolin_vpn/models/node.dart';
import 'package:pangolin_vpn/models/routing_profile.dart';
import 'package:pangolin_vpn/services/account_api.dart';
import 'package:pangolin_vpn/services/api_client.dart';
import 'package:pangolin_vpn/services/connect_api.dart';
import 'package:pangolin_vpn/services/token_store.dart';
import 'package:pangolin_vpn/state/account_providers.dart';
import 'package:pangolin_vpn/state/auth_provider.dart';
import 'package:pangolin_vpn/state/connection_provider.dart';
import 'package:pangolin_vpn/state/nodes_provider.dart';
import 'package:pangolin_vpn/state/routing_provider.dart';

/// 已登录的桩 TokenStore(仿 routing_provider_test.dart)。
class _LoggedInTokenStore implements TokenStore {
  const _LoggedInTokenStore();
  @override
  Future<void> saveTokens({required String access, required String refresh}) async {}
  @override
  Future<String?> loadAccessToken() async => 'test-token';
  @override
  Future<String?> loadRefreshToken() async => 'test-refresh';
  @override
  Future<void> clear() async {}
  @override
  Future<void> markOnboarded() async {}
  @override
  Future<bool> isOnboarded() async => true;
  @override
  Future<void> saveLastEmail(String email) async {}
  @override
  Future<String?> loadLastEmail() async => null;
}

/// 假 AccountApi:桩 routingProfile()/saveRoutingProfile(),记录调用便于断言。
class _FakeAccountApi extends AccountApi {
  _FakeAccountApi()
      : super(ApiClient(
          baseUrl: 'http://test.local',
          getToken: () => null,
          refresh: () async => false,
        ));

  RoutingProfile initial = const RoutingProfile();
  final List<RoutingProfile> saved = [];

  @override
  Future<RoutingProfile> routingProfile() async => initial;

  @override
  Future<void> saveRoutingProfile(RoutingProfile p) async {
    saved.add(p);
  }
}

/// 计数版 VpnBridgeMock:记录 start() 被调用的次数,用于断言「是否重连过」
/// (重连 = disconnect→connect,即 start() 被再次调用)。
class _CountingBridge extends VpnBridgeMock {
  _CountingBridge() : super(connectDelay: const Duration(milliseconds: 10));
  int startCount = 0;

  @override
  Future<void> start(String configJson) async {
    startCount++;
    await super.start(configJson);
  }
}

const _readyNode =
    Node(code: 'HK', nameZh: '香港', nameEn: 'Hong Kong', ping: 18, uuid: 'hk-01');

Future<void> _waitLoggedIn(ProviderContainer c) async {
  for (var i = 0; i < 60; i++) {
    if (c.read(authProvider).isLoggedIn) return;
    await Future<void>.delayed(const Duration(milliseconds: 10));
  }
  throw StateError('authProvider 未在预期时间内进入已登录态');
}

Future<void> _until(bool Function() cond,
    {Duration timeout = const Duration(seconds: 2)}) async {
  final sw = Stopwatch()..start();
  while (!cond() && sw.elapsed < timeout) {
    await Future<void>.delayed(const Duration(milliseconds: 5));
  }
}

ProviderContainer _makeContainer(_FakeAccountApi api, _CountingBridge bridge) {
  final mock = MockClient((req) async => http.Response('{"fake":"singbox-config"}', 200));
  return ProviderContainer(overrides: [
    tokenStoreProvider.overrideWithValue(const _LoggedInTokenStore()),
    accountApiProvider.overrideWithValue(api),
    effectiveNodeProvider.overrideWithValue(_readyNode),
    vpnBridgeProvider.overrideWithValue(bridge),
    connectApiFactoryProvider.overrideWithValue(
      (token) => ConnectApi(baseUrl: 'http://test.local', authToken: token, client: mock),
    ),
  ]);
}

void main() {
  test('连接态 on 时保存档案 → 触发重连(disconnect→connect)', () async {
    final api = _FakeAccountApi();
    final bridge = _CountingBridge();
    final c = _makeContainer(api, bridge);
    addTearDown(c.dispose);

    await _waitLoggedIn(c);
    await c.read(routingProfileProvider.future);

    // 先连上。
    c.read(connectionProvider.notifier).toggle();
    await _until(() => c.read(connectionProvider).phase == VpnPhase.on);
    expect(bridge.startCount, 1, reason: '首次连接应调用一次 start()');

    // 保存档案(连接态 on)→ 应触发一次重连(再调 start())。
    await c.read(routingProfileProvider.notifier).save();
    await _until(() => bridge.startCount >= 2);
    expect(bridge.startCount, 2, reason: '保存成功且 on 态应重连一次(再次 start())');

    // 重连期间应给出瞬态提示,并最终重新回到 on。
    await _until(() => c.read(connectionProvider).phase == VpnPhase.on);
    expect(c.read(connectionProvider).phase, VpnPhase.on, reason: '重连后应回到 on');
  });

  test('连接态 off 时保存档案 → 不触发重连', () async {
    final api = _FakeAccountApi();
    final bridge = _CountingBridge();
    final c = _makeContainer(api, bridge);
    addTearDown(c.dispose);

    await _waitLoggedIn(c);
    await c.read(routingProfileProvider.future);

    expect(c.read(connectionProvider).phase, VpnPhase.off, reason: '未连接');

    await c.read(routingProfileProvider.notifier).save();
    // 给可能的(不应发生的)异步重连留出时间窗口。
    await Future<void>.delayed(const Duration(milliseconds: 100));

    expect(bridge.startCount, 0, reason: 'off 态不应触发重连');
    expect(c.read(connectionProvider).phase, VpnPhase.off);
  });

  test('addRule 触发的乐观保存(on 态)同样重连', () async {
    final api = _FakeAccountApi();
    final bridge = _CountingBridge();
    final c = _makeContainer(api, bridge);
    addTearDown(c.dispose);

    await _waitLoggedIn(c);
    await c.read(routingProfileProvider.future);

    c.read(connectionProvider.notifier).toggle();
    await _until(() => c.read(connectionProvider).phase == VpnPhase.on);
    expect(bridge.startCount, 1);

    const rule = RoutingRule(type: 'domain_suffix', value: 'x.com', action: 'direct');
    await c.read(routingProfileProvider.notifier).addRule(rule);

    await _until(() => bridge.startCount >= 2);
    expect(bridge.startCount, 2, reason: 'addRule 内部落盘同样应触发重连');
  });
}