import 'package:eatvio_app/features/payment/models/promo_apply_response.dart';
import 'package:eatvio_app/features/payment/models/promo_code_model.dart';
import 'package:eatvio_app/features/payment/models/promo_validate_response.dart';
import 'package:eatvio_app/features/payment/presentation/payment_flow.dart';
import 'package:eatvio_app/features/payment/presentation/widgets/promo_code_modal.dart';
import 'package:eatvio_app/generated/l10n.dart';
import 'package:flutter/material.dart';
import 'package:flutter_localizations/flutter_localizations.dart';
import 'package:flutter_test/flutter_test.dart';

void main() {
  TestWidgetsFlutterBinding.ensureInitialized();

  Widget createTestApp() {
    return const MaterialApp(
      localizationsDelegates: [
        S.delegate,
        GlobalMaterialLocalizations.delegate,
        GlobalWidgetsLocalizations.delegate,
        GlobalCupertinoLocalizations.delegate,
      ],
      supportedLocales: [Locale('ru')],
      home: Scaffold(body: SizedBox()),
    );
  }

  group('showConsultationPaymentFlow', () {
    late bool gateCalled;
    late bool? gateResult;
    late bool formCalled;
    late PromoCodeResult? formResult;
    late PromoCodeModel? formInitialPromo;
    late bool sbpCalled;
    late int sbpPlanId;
    late int validateCalls;
    late int applyCalls;
    late String? lastValidatedCode;
    late String? lastAppliedCode;
    late PromoValidateResponse validateResponse;
    late PromoApplyResponse applyResponse;
    late bool applyThrows;
    late PromoCodeModel? listAppliedResult;

    Future<bool?> mockGate(BuildContext context) async {
      gateCalled = true;
      return gateResult;
    }

    Future<PromoCodeResult?> mockForm(
      BuildContext context, {
      Future<PromoValidation> Function(String)? onValidate,
      Future<bool> Function()? onRemove,
      PromoCodeModel? initialPromo,
    }) async {
      formCalled = true;
      formInitialPromo = initialPromo;

      if (formResult?.hasPromoCode == true &&
          !formResult!.alreadyApplied &&
          onValidate != null) {
        final validation = await onValidate(formResult!.code!);
        if (!validation.isValid) {
          return null;
        }
        return PromoCodeResult(
          code: formResult!.code,
          discountPercent: validation.discountPercent,
          discountAmountRub: validation.discountAmountRub,
          originalAmountRub: validation.originalAmountRub,
          finalAmountRub: validation.finalAmountRub,
        );
      }
      return formResult;
    }

    Future<void> mockSbp(BuildContext context, {required int planId}) async {
      sbpCalled = true;
      sbpPlanId = planId;
    }

    Future<PromoValidateResponse> mockValidate({
      required int planId,
      required String promoCode,
    }) async {
      validateCalls++;
      lastValidatedCode = promoCode;
      return validateResponse;
    }

    Future<PromoApplyResponse> mockApply({
      required int planId,
      required String promoCode,
    }) async {
      applyCalls++;
      lastAppliedCode = promoCode;
      if (applyThrows) {
        throw Exception('network');
      }
      return applyResponse;
    }

    Future<PromoCodeModel?> mockListApplied(int planId) async {
      return listAppliedResult;
    }

    Future<bool> mockRemove(int planId) async {
      return true;
    }

    setUp(() {
      gateCalled = false;
      gateResult = null;
      formCalled = false;
      formResult = null;
      formInitialPromo = null;
      sbpCalled = false;
      sbpPlanId = 0;
      validateCalls = 0;
      applyCalls = 0;
      lastValidatedCode = null;
      lastAppliedCode = null;
      listAppliedResult = null;
      validateResponse = const PromoValidateResponse(
        valid: true,
        promoCode: 'TEST123',
        discountPercent: 5,
        discountAmountRub: 60,
        originalAmountRub: 1200,
        finalAmountRub: 1140,
      );
      applyResponse = const PromoApplyResponse(success: true);
      applyThrows = false;
    });

    Future<void> runFlow(WidgetTester tester) {
      return showConsultationPaymentFlow(
        tester.element(find.byType(SizedBox)),
        planId: 42,
        showGate: mockGate,
        showForm: mockForm,
        showSbp: mockSbp,
        validatePromo: mockValidate,
        applyPromo: mockApply,
        listApplied: mockListApplied,
        removePromo: mockRemove,
      );
    }

    testWidgets('Нет → вызывает SbpBanks (не форму)', (tester) async {
      gateResult = false;
      await tester.pumpWidget(createTestApp());

      await runFlow(tester);

      expect(gateCalled, isTrue);
      expect(formCalled, isFalse);
      expect(sbpCalled, isTrue);
      expect(sbpPlanId, 42);
      expect(validateCalls, 0);
      expect(applyCalls, 0);
    });

    testWidgets('Да → форма → Пропустить → вызывает SbpBanks', (tester) async {
      gateResult = true;
      formResult = const PromoCodeResult();
      await tester.pumpWidget(createTestApp());

      await runFlow(tester);

      expect(gateCalled, isTrue);
      expect(formCalled, isTrue);
      expect(sbpCalled, isTrue);
      expect(sbpPlanId, 42);
      expect(applyCalls, 0);
    });

    testWidgets('Да → форма отменена (null) → Sbp не вызывается', (tester) async {
      gateResult = true;
      formResult = null;
      await tester.pumpWidget(createTestApp());

      await runFlow(tester);

      expect(gateCalled, isTrue);
      expect(formCalled, isTrue);
      expect(sbpCalled, isFalse);
    });

    testWidgets('гейт отменён (null) → ничего не вызывается', (tester) async {
      gateResult = null;
      await tester.pumpWidget(createTestApp());

      await runFlow(tester);

      expect(gateCalled, isTrue);
      expect(formCalled, isFalse);
      expect(sbpCalled, isFalse);
    });

    testWidgets('Да → код → validate + apply → SbpBanks', (tester) async {
      gateResult = true;
      formResult = const PromoCodeResult(code: 'TEST123');
      await tester.pumpWidget(createTestApp());

      await runFlow(tester);

      expect(validateCalls, 1);
      expect(lastValidatedCode, 'TEST123');
      expect(applyCalls, 1);
      expect(lastAppliedCode, 'TEST123');
      expect(sbpCalled, isTrue);
      expect(sbpPlanId, 42);
    });

    testWidgets('Да → код → apply fail → Sbp не вызывается', (tester) async {
      gateResult = true;
      formResult = const PromoCodeResult(code: 'BAD');
      applyResponse = const PromoApplyResponse(
        success: false,
        error: 'Промокод уже использован',
      );
      await tester.pumpWidget(createTestApp());

      await runFlow(tester);

      expect(applyCalls, 1);
      expect(sbpCalled, isFalse);
    });

    testWidgets('applied rehydrate → Continue → SBP без apply и без гейта', (tester) async {
      listAppliedResult = const PromoCodeModel(
        id: 1,
        chosenPlanId: 42,
        promoCode: 'SAVE5',
        discountPercent: 5,
        discountAmountRub: 60,
        state: 'applied',
      );
      formResult = const PromoCodeResult(
        code: 'SAVE5',
        discountPercent: 5,
        discountAmountRub: 60,
        alreadyApplied: true,
      );
      await tester.pumpWidget(createTestApp());

      await runFlow(tester);

      expect(gateCalled, isFalse);
      expect(formCalled, isTrue);
      expect(formInitialPromo?.promoCode, 'SAVE5');
      expect(applyCalls, 0);
      expect(sbpCalled, isTrue);
    });

    testWidgets('list пустой → идёт через гейт', (tester) async {
      listAppliedResult = null;
      gateResult = false;
      await tester.pumpWidget(createTestApp());

      await runFlow(tester);

      expect(gateCalled, isTrue);
      expect(formCalled, isFalse);
      expect(sbpCalled, isTrue);
    });

    testWidgets('rehydrate → Remove → новый код → apply → SBP', (tester) async {
      listAppliedResult = const PromoCodeModel(
        id: 1,
        chosenPlanId: 42,
        promoCode: 'OLD',
        discountPercent: 5,
        discountAmountRub: 60,
        state: 'applied',
      );
      formResult = const PromoCodeResult(code: 'NEW123');
      await tester.pumpWidget(createTestApp());

      await runFlow(tester);

      expect(gateCalled, isFalse);
      expect(formCalled, isTrue);
      expect(validateCalls, 1);
      expect(applyCalls, 1);
      expect(lastAppliedCode, 'NEW123');
      expect(sbpCalled, isTrue);
    });

    testWidgets('rehydrate → Remove → Skip → SBP без apply', (tester) async {
      listAppliedResult = const PromoCodeModel(
        id: 1,
        chosenPlanId: 42,
        promoCode: 'OLD',
        discountPercent: 5,
        discountAmountRub: 60,
        state: 'applied',
      );
      formResult = const PromoCodeResult();
      await tester.pumpWidget(createTestApp());

      await runFlow(tester);

      expect(gateCalled, isFalse);
      expect(formCalled, isTrue);
      expect(applyCalls, 0);
      expect(sbpCalled, isTrue);
    });
  });
}