import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:pangolin_vpn/l10n/strings_zh.dart';
import 'package:pangolin_vpn/models/payment.dart';
import 'package:pangolin_vpn/pangolin_theme.dart';
import 'package:pangolin_vpn/screens/payment_page.dart';
import 'package:pangolin_vpn/screens/purchase_page.dart';
import 'package:pangolin_vpn/services/payment_api.dart';
import 'package:pangolin_vpn/state/payment_provider.dart';
import 'package:pangolin_vpn/widgets/plan_card.dart';

import '../helpers/harness.dart';

const _items = [
  PayCatalogItem(sku: 'pro_month', plan: 'pro', days: 31, priceMinor: 2999, currency: 'CNY', priceUsdtMicro: 4990000),
  PayCatalogItem(sku: 'pro_quarter', plan: 'pro', days: 92, priceMinor: 6888, currency: 'CNY', priceUsdtMicro: 12990000),
  PayCatalogItem(sku: 'pro_year', plan: 'pro', days: 366, priceMinor: 19999, currency: 'CNY', priceUsdtMicro: 34990000),
];

const _itemsWithPromo = [
  PayCatalogItem(
      sku: 'pro_month_promo', plan: 'pro', days: 31, priceMinor: 600, currency: 'CNY',
      priceUsdtMicro: 1000000, promo: true),
  ..._items,
];

/// 轮询生命周期测试专用假 API:记 orderStatus / cancel 调用次数,其余按最小实现返回。
class _PollingFakePaymentApi implements PaymentApi {
  int statusCalls = 0;
  int cancelCalls = 0;

  @override
  Future<List<PayCatalogItem>> catalog() async => const [];

  @override
  Future<List<PayOrderSummary>> listOrders() async => const [];

  @override
  Future<PayOrder> createOrder({required String sku, required String method, Map<String, String>? metadata}) async =>
      const PayOrder(
        orderNo: 'pay1',
        session: PaySession(renderType: 'crypto_address', payload: {'address': 'TXYZabc123', 'amount': '4.20'}),
      );

  @override
  Future<PayOrderStatus> orderStatus(String orderNo) async {
    statusCalls++;
    return PayOrderStatus(orderNo: orderNo, payStatus: 'pending', activated: false, expiresAt: null);
  }

  @override
  Future<PayOrder> retry(String orderNo, {required String method, Map<String, String>? metadata}) async =>
      const PayOrder(orderNo: 'pay1', session: PaySession(renderType: 'redirect', payload: {'url': 'https://x'}));

  @override
  Future<void> cancel(String orderNo) async {
    cancelCalls++;
  }
}

void main() {
  setUpAll(disableGoogleFontsFetching);
  const t = StringsZh();

  testWidgets('购买页:三档 PlanCard + 价格', (tester) async {
    // 默认测试视口(800×600)放不下三张 PlanCard(ListView 非懒加载但受
    // Viewport cacheExtent 限制,第三张滚动区外不构建)——加高视口,
    // 不改断言本身。
    tester.view.physicalSize = const Size(800, 2400);
    tester.view.devicePixelRatio = 1.0;
    addTearDown(tester.view.reset);
    await tester.pumpWidget(wrapThemed(
      PurchaseScreen(t: t, embedded: true),
      overrides: [payCatalogProvider.overrideWith((ref) async => _items)],
    ));
    await tester.pumpAndSettle();
    expect(find.byType(PlanCard), findsNWidgets(3));
    expect(find.text(t.proQuarterly), findsOneWidget);
    // 默认支付渠道 = USDT → 套餐价显 USDT
    expect(find.text('\$4.99'), findsOneWidget);
    expect(find.text('\$34.99'), findsOneWidget);
    // 切到人民币渠道 → 套餐价改显 ¥
    await tester.tap(find.text(t.payChannelCny));
    await tester.pumpAndSettle();
    expect(find.text('¥29.99'), findsOneWidget);
    expect(find.text('¥199.99'), findsOneWidget);
  });

  testWidgets('购买页:全员优惠月付特殊卡片(随渠道显价 + 原价划线)', (tester) async {
    tester.view.physicalSize = const Size(800, 2400);
    tester.view.devicePixelRatio = 1.0;
    addTearDown(tester.view.reset);
    await tester.pumpWidget(wrapThemed(
      PurchaseScreen(t: t, embedded: true),
      overrides: [payCatalogProvider.overrideWith((ref) async => _itemsWithPromo)],
    ));
    await tester.pumpAndSettle();
    // 普通 3 档照旧渲染 + 1 张特殊卡片(非 PlanCard)。
    expect(find.byType(PlanCard), findsNWidgets(3));
    expect(find.text(t.promoBadge), findsOneWidget);
    // 默认 USDT → 现价 \$1.00;原价(pro_month)\$4.99 同时出现在划线原价 + 下方普通
    // pro_month PlanCard(两处同值,断言 2 处)。
    expect(find.text('\$1.00'), findsOneWidget);
    expect(find.text('\$4.99'), findsNWidgets(2));
    // 切到人民币 → 现价 ¥6.00;原价 ¥29.99 同理 2 处。
    await tester.tap(find.text(t.payChannelCny));
    await tester.pumpAndSettle();
    expect(find.text('¥6.00'), findsOneWidget);
    expect(find.text('¥29.99'), findsNWidgets(2));
  });

  testWidgets('支付页 crypto_address:地址/金额/复制,金额用 mono', (tester) async {
    final flow = PaymentFlowState(
      phase: PaymentPhase.awaitingPayment,
      item: _items.first,
      method: 'crypto',
      order: const PayOrder(
        orderNo: 'pay1',
        session: PaySession(renderType: 'crypto_address', payload: {
          'address': 'TXYZabc123',
          'amount': '4.201234',
          'amount_minor': 4201234,
          'currency': 'USDT',
          'network': 'TRC20',
        }),
      ),
    );
    await tester.pumpWidget(wrapThemed(
      PaymentScreen(t: t, embedded: true),
      overrides: [
        paymentFlowProvider.overrideWith((ref) => PaymentFlowController.fixed(flow)),
      ],
    ));
    await tester.pump();
    expect(find.text('TXYZabc123'), findsOneWidget);
    expect(find.textContaining('4.201234'), findsOneWidget);
    expect(find.text(t.payExactAmountHint), findsOneWidget);
    expect(find.text(t.awaitingPayment), findsOneWidget);
  });

  testWidgets('支付页 redirect:外链按钮 + 引导文案', (tester) async {
    final flow = PaymentFlowState(
      phase: PaymentPhase.awaitingPayment,
      item: _items.first,
      method: 'alipay',
      order: const PayOrder(
        orderNo: 'pay1',
        session: PaySession(renderType: 'redirect', payload: {'url': 'https://alipay.example/x'}),
      ),
    );
    await tester.pumpWidget(wrapThemed(
      PaymentScreen(t: t, embedded: true),
      overrides: [paymentFlowProvider.overrideWith((ref) => PaymentFlowController.fixed(flow))],
    ));
    await tester.pump();
    expect(find.text(t.openAlipay), findsOneWidget);
    expect(find.text(t.openAlipayHint), findsOneWidget);
  });

  testWidgets('支付页成功态:已开通 + 完成', (tester) async {
    final flow = PaymentFlowState(
      phase: PaymentPhase.succeeded,
      item: _items.first,
      method: 'crypto',
      status: PayOrderStatus(
          orderNo: 'pay1', payStatus: 'succeeded', activated: true,
          expiresAt: DateTime.utc(2026, 8, 10)),
    );
    await tester.pumpWidget(wrapThemed(
      PaymentScreen(t: t, embedded: true),
      overrides: [paymentFlowProvider.overrideWith((ref) => PaymentFlowController.fixed(flow))],
    ));
    await tester.pump();
    expect(find.text(t.paySucceeded), findsOneWidget);
    expect(find.text(t.payDone), findsOneWidget);
  });

  testWidgets('支付页 dispose 后停止轮询,但不取消订单(离开页面≠放弃订单)', (tester) async {
    final api = _PollingFakePaymentApi();
    final container = ProviderContainer(overrides: [paymentApiProvider.overrideWithValue(api)]);
    addTearDown(container.dispose);
    await container.read(paymentFlowProvider.notifier).start(_items.first, 'crypto');
    expect(container.read(paymentFlowProvider).phase, PaymentPhase.awaitingPayment);

    final showPage = ValueNotifier(true);
    addTearDown(showPage.dispose);
    await tester.pumpWidget(UncontrolledProviderScope(
      container: container,
      child: MaterialApp(
        debugShowCheckedModeBanner: false,
        theme: PangolinTheme.light,
        home: ValueListenableBuilder<bool>(
          valueListenable: showPage,
          builder: (_, show, __) => show ? PaymentScreen(t: t, embedded: true) : const SizedBox.shrink(),
        ),
      ),
    ));
    await tester.pump();

    // 页面挂载期间:轮询按 3s 间隔正常触发。
    await tester.pump(const Duration(seconds: 4));
    final callsWhileMounted = api.statusCalls;
    expect(callsWhileMounted, greaterThan(0));

    // 卸载支付页(触发 dispose)→ 只停轮询,之后不应再新增 orderStatus 调用。
    showPage.value = false;
    await tester.pump();
    await tester.pump(const Duration(seconds: 4));
    await tester.pump(const Duration(seconds: 4));
    expect(api.statusCalls, callsWhileMounted, reason: '支付页卸载后轮询应已停止');

    // 关键回归断言:dispose 绝不能是「隐式取消订单」——不发远程 cancel,
    // controller state 也不应被重置为 idle,订单在后台仍然存活。
    expect(api.cancelCalls, 0, reason: 'dispose 不应远程取消订单');
    expect(container.read(paymentFlowProvider).phase, PaymentPhase.awaitingPayment,
        reason: 'dispose 后订单状态应保持 awaitingPayment,不应被静默重置为 idle');
    expect(container.read(paymentFlowProvider).order?.orderNo, 'pay1');
  });

  testWidgets('支付页「取消订单」按钮:确实远程取消 + 状态归 idle(与 dispose 路径区分)', (tester) async {
    final api = _PollingFakePaymentApi();
    final container = ProviderContainer(overrides: [paymentApiProvider.overrideWithValue(api)]);
    addTearDown(container.dispose);
    await container.read(paymentFlowProvider.notifier).start(_items.first, 'crypto');
    expect(container.read(paymentFlowProvider).phase, PaymentPhase.awaitingPayment);

    await tester.pumpWidget(UncontrolledProviderScope(
      container: container,
      child: MaterialApp(
        debugShowCheckedModeBanner: false,
        theme: PangolinTheme.light,
        home: PaymentScreen(t: t, embedded: true),
      ),
    ));
    await tester.pump();

    await tester.tap(find.text(t.cancelOrder));
    await tester.pumpAndSettle();

    expect(api.cancelCalls, 1, reason: '显式点「取消订单」应远程取消');
    expect(container.read(paymentFlowProvider).phase, PaymentPhase.idle,
        reason: '显式取消后状态应归 idle');
  });
}