// connection_controller_test.dart — 连接状态机:严格三态、禁乐观显示
//
// ConnectionController 通过 Riverpod ProviderContainer 测试。
// 使用演示节点（uuid 为空）→ 走 mock 分支（1.2s Timer 进入 on）。
// 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 {}
}

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

/// 演示节点（uuid 为空 → _connect 走 1.2s mock 分支）。
const _demoNode = Node(
  code: 'HK',
  nameZh: '香港',
  nameEn: 'Hong Kong',
  ping: 18,
);

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

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

  test('toggle → off 态立即切为 connecting', () {
    final c = makeContainer();
    addTearDown(c.dispose);
    c.read(connectionProvider.notifier).toggle();
    expect(c.read(connectionProvider).phase, VpnPhase.connecting);
  });

  test('connecting 时再次 toggle 被忽略（禁止乐观回退）', () {
    final c = makeContainer();
    addTearDown(c.dispose);
    c.read(connectionProvider.notifier).toggle();
    expect(c.read(connectionProvider).phase, VpnPhase.connecting);
    c.read(connectionProvider.notifier).toggle(); // connecting 中点 → 无效
    expect(c.read(connectionProvider).phase, VpnPhase.connecting);
  });

  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);
  });
}