// nodes_provider_test.dart — 节点选择 / 智能选择派生
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:pangolin_vpn/l10n/app_text.dart';
import 'package:pangolin_vpn/models/node.dart';
import 'package:pangolin_vpn/services/token_store.dart';
import 'package:pangolin_vpn/state/auth_provider.dart';
import 'package:pangolin_vpn/state/nodes_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：带 stub 覆盖的 ProviderContainer ──────────────────────

ProviderContainer makeContainer({List<Override> overrides = const []}) =>
    ProviderContainer(overrides: [
      tokenStoreProvider.overrideWithValue(const _NullTokenStore()),
      // effectiveNodeProvider 在 nodesProvider 加载时退回 kDemoNodes，
      // 所以测试直接读 effectiveNodeProvider，无需等待 nodesProvider.future。
      ...overrides,
    ]);

void main() {
  test('默认智能选择(AUTO)', () {
    final c = makeContainer();
    addTearDown(c.dispose);
    expect(c.read(selectedNodeCodeProvider), kSmartNodeCode);
    expect(c.read(isSmartSelectProvider), true);
  });

  test('智能选择取延迟最小节点（退回 kDemoNodes）', () {
    final c = makeContainer();
    addTearDown(c.dispose);
    // nodesProvider 加载中时退回 kDemoNodes，effectiveNodeProvider 立即可用。
    final node = c.read(effectiveNodeProvider);
    final minPing = kDemoNodes.map((n) => n.ping).reduce((a, b) => a < b ? a : b);
    expect(node.ping, minPing);
  });

  test('选中具体节点后生效节点随之改变', () {
    final c = makeContainer();
    addTearDown(c.dispose);
    c.read(selectedNodeCodeProvider.notifier).state = 'JP';
    expect(c.read(isSmartSelectProvider), false);
    expect(c.read(effectiveNodeProvider).code, 'JP');
  });

  test('localizedSub 不串语言:无标签用拉丁地名', () {
    const tw = Node(code: 'TW', nameZh: '台湾 台北', nameEn: 'Taipei', ping: 28);
    expect(tw.localizedSub(AppLang.zh), 'Taipei');
    expect(tw.localizedSub(AppLang.en), 'Taipei');
    const hk = Node(code: 'HK', nameZh: '香港 · 流媒体', nameEn: 'Hong Kong', ping: 18, tag: NodeTag.streaming);
    expect(hk.localizedSub(AppLang.zh), '流媒体优化');
    expect(hk.localizedSub(AppLang.en), 'Streaming');
  });
}