// connection_controller_test.dart — 连接状态机:严格三态、错误冒泡
//
// ConnectionController 通过 Riverpod ProviderContainer 测试。
// 节点 uuid 为空(未就绪)→ _connect 不走网络,直接回 off 并给出错误提示。
// 覆盖 tokenStoreProvider 避免 FlutterSecureStorage 平台依赖。
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:pangolin_vpn/bridge/vpn_bridge_provider.dart';
import 'package:pangolin_vpn/bridge/vpn_bridge_mock.dart';
import 'package:pangolin_vpn/models/node.dart';
import 'package:pangolin_vpn/services/token_store.dart';
import 'package:pangolin_vpn/state/connection_provider.dart';
import 'package:pangolin_vpn/state/nodes_provider.dart';
import 'package:pangolin_vpn/state/auth_provider.dart';

// ── Stub TokenStore（无平台依赖）──────────────────────────────────

class _NullTokenStore implements TokenStore {
  const _NullTokenStore();
  @override
  Future<void> saveTokens({required String access, required String refresh}) async {}
  @override
  Future<String?> loadAccessToken() async => null;
  @override
  Future<String?> loadRefreshToken() async => null;
  @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;
}

// ── 辅助 ──────────────────────────────────────────────────────────

/// 未就绪节点(uuid 为空)→ _connect 不走网络,直接回 off+错误。
const _notReadyNode = Node(code: 'HK', nameZh: '香港', nameEn: 'Hong Kong', ping: 18);

ProviderContainer makeContainer() => ProviderContainer(
      overrides: [
        tokenStoreProvider.overrideWithValue(const _NullTokenStore()),
        effectiveNodeProvider.overrideWithValue(_notReadyNode),
        vpnBridgeProvider.overrideWithValue(VpnBridgeMock()),
      ],
    );

void main() {
  test('初始为 off', () {
    final c = makeContainer();
    addTearDown(c.dispose);
    expect(c.read(connectionProvider).phase, VpnPhase.off);
  });

  test('节点未就绪时 toggle → 回 off 并冒泡错误(不再静默)', () {
    final c = makeContainer();
    addTearDown(c.dispose);
    c.read(connectionProvider.notifier).toggle();
    final s = c.read(connectionProvider);
    expect(s.phase, VpnPhase.off);
    expect(s.error, isNotNull);
  });

  test('off 态 onNodeChanged 不触发连接', () {
    final c = makeContainer();
    addTearDown(c.dispose);
    c.read(connectionProvider.notifier).onNodeChanged();
    expect(c.read(connectionProvider).phase, VpnPhase.off);
  });
}