import 'dart:ui' as ui;

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';

import 'package:flutter_test/flutter_test.dart';

import 'package:go_router/go_router.dart';

import 'package:sxchnge_analytics/sxchnge_analytics.dart';

import 'package:sxchnge_kyc/sxchnge_kyc.dart';

import 'package:sxchnge_app/kyc/country.dart';
import 'package:sxchnge_app/main.dart';
import 'package:sxchnge_app/providers/locale.dart';

class Photos implements PhotoService {
  Photos(this.bytes);
  final Uint8List bytes;
  KycError? error;
  @override
  Future<Photo?> pick() async {
    if (error != null) throw KycException(error!);
    return Photo(bytes);
  }
}

Future<void> tap(WidgetTester t, Finder finder) async {
  await t.ensureVisible(finder);
  await t.tap(finder);
  await t.pumpAndSettle();
}

void main() {
  late Uint8List bytes;
  setUpAll(() async {
    final r = ui.PictureRecorder();
    final c = ui.Canvas(r);
    c.drawRect(const Rect.fromLTWH(0, 0, 600, 600), Paint());
    final pic = r.endRecording();
    final image = await pic.toImage(600, 600);
    bytes = (await image.toByteData(format: ui.ImageByteFormat.png))!.buffer
        .asUint8List();
    image.dispose();
    pic.dispose();
  });
  Future<DummyIdentityService> open(
    WidgetTester t, {
    Photos? photos,
    Locale? locale,
  }) async {
    t.platformDispatcher.defaultRouteNameTestValue = '/identity';
    addTearDown(t.platformDispatcher.clearDefaultRouteNameTestValue);
    final service = DummyIdentityService(delay: Duration.zero);
    final provider = LocaleProvider();
    if (locale != null) await provider.setLocale(locale);
    await t.pumpWidget(
      SxchngeApp(
        identityService: service,
        photoService: photos ?? Photos(bytes),
        localeProvider: provider,
      ),
    );
    await t.pumpAndSettle();
    return service;
  }

  Future<void> submit(WidgetTester t) async {
    await tap(t, find.byKey(const ValueKey('kyc-start')));
    await t.enterText(find.byKey(const ValueKey('kyc-name')), 'Example Person');
    await t.enterText(find.byKey(const ValueKey('kyc-birth')), '1990-04-23');
    await tap(
      t,
      find.descendant(
        of: find.byKey(const ValueKey('kyc-country')),
        matching: find.byType(OutlinedButton),
      ),
    );
    await t.enterText(find.byKey(const ValueKey('country-search')), 'PL');
    await t.pumpAndSettle();
    await tap(t, find.byType(ListTile));
    expect(
      t.widget<CountryField>(find.byKey(const ValueKey('kyc-country'))).value,
      'PL',
    );
    await t.pumpAndSettle();
    await tap(t, find.byKey(const ValueKey('pick-passport')));
    await tap(t, find.byKey(const ValueKey('kyc-next')));
    await tap(t, find.byKey(const ValueKey('pick-selfie')));
    await tap(t, find.byKey(const ValueKey('kyc-next')));
    await tap(t, find.byType(CheckboxListTile));
    await tap(t, find.byKey(const ValueKey('kyc-submit')));
  }

  testWidgets('two photos, review, pending and approval with service limits', (
    t,
  ) async {
    await open(t);
    expect(find.byKey(const ValueKey('kyc-unverified')), findsOneWidget);
    await submit(t);
    expect(find.byKey(const ValueKey('kyc-pending')), findsOneWidget);
    await tap(t, find.byType(ExpansionTile));
    await tap(t, find.text('Approve'));
    expect(find.byKey(const ValueKey('kyc-approved')), findsOneWidget);
    expect(find.text('Verified'), findsOneWidget);
    expect(t.takeException(), null);
  });
  testWidgets('denial provides explanation and support, no resubmit', (
    t,
  ) async {
    await open(t);
    await submit(t);
    await tap(t, find.byType(ExpansionTile));
    await tap(t, find.text('Decline'));
    expect(find.byKey(const ValueKey('kyc-denied')), findsOneWidget);
    expect(find.byKey(const ValueKey('kyc-start')), findsNothing);
    await tap(t, find.text('Contact support'));
    expect(find.byType(AlertDialog), findsOneWidget);
  });
  testWidgets('optional onboarding can be skipped before collecting proofs', (
    t,
  ) async {
    t.platformDispatcher.defaultRouteNameTestValue = '/identity?onboarding=1';
    addTearDown(t.platformDispatcher.clearDefaultRouteNameTestValue);
    await t.pumpWidget(
      SxchngeApp(
        identityService: DummyIdentityService(delay: Duration.zero),
        photoService: Photos(bytes),
      ),
    );
    await t.pumpAndSettle();
    final router = GoRouter.of(
      t.element(find.byKey(const ValueKey('kyc-start'))),
    );
    await tap(t, find.text('Keep basic limits'));
    expect(router.routeInformationProvider.value.uri.path, '/accounts');
    expect(find.byType(AlertDialog), findsNothing);
  });
  testWidgets('correctable rejection can be resubmitted', (t) async {
    await open(t);
    await submit(t);
    await tap(t, find.byType(ExpansionTile));
    await tap(t, find.text('Request clearer passport'));
    expect(find.byKey(const ValueKey('kyc-changesRequested')), findsOneWidget);
    await submit(t);
    expect(find.byKey(const ValueKey('kyc-pending')), findsOneWidget);
  });
  testWidgets('picker error recovery and discard confirmation', (t) async {
    final photos = Photos(bytes)..error = KycError.permission;
    await open(t, photos: photos);
    await tap(t, find.byKey(const ValueKey('kyc-start')));
    await tap(t, find.byKey(const ValueKey('pick-passport')));
    expect(find.byKey(const ValueKey('kyc-error')), findsOneWidget);
    photos.error = null;
    await tap(t, find.byKey(const ValueKey('pick-passport')));
    await tap(t, find.text('Keep basic limits'));
    expect(find.byType(AlertDialog), findsOneWidget);
    await tap(t, find.text('Keep editing'));
    expect(find.byKey(const ValueKey('pick-passport')), findsOneWidget);
    await tap(t, find.text('Keep basic limits'));
    await tap(t, find.text('Discard & leave'));
    expect(find.byKey(const ValueKey('kyc-unverified')), findsOneWidget);
  });
  testWidgets(
    '320px Russian at large text works through submission and keyboard',
    (t) async {
      t.view.physicalSize = const Size(320, 900);
      t.view.devicePixelRatio = 1;
      t.platformDispatcher.textScaleFactorTestValue = 1.6;
      addTearDown(t.view.resetPhysicalSize);
      addTearDown(t.view.resetDevicePixelRatio);
      addTearDown(t.platformDispatcher.clearTextScaleFactorTestValue);
      await open(t, locale: const Locale('ru'));
      expect(find.text('Верификация и лимиты'), findsOneWidget);
      await t.sendKeyEvent(LogicalKeyboardKey.tab);
      await t.pump();
      await submit(t);
      expect(find.byKey(const ValueKey('kyc-pending')), findsOneWidget);
      expect(t.takeException(), null);
    },
  );
  testWidgets('status failure exposes retry without asserting basic state', (
    t,
  ) async {
    t.platformDispatcher.defaultRouteNameTestValue = '/identity';
    addTearDown(t.platformDispatcher.clearDefaultRouteNameTestValue);
    final service = DummyIdentityService(delay: Duration.zero)
      ..nextError = KycError.unavailable;
    await t.pumpWidget(
      SxchngeApp(
        identityService: service,
        photoService: Photos(bytes),
        analyticsService: DummyAnalyticsService(),
      ),
    );
    await t.pumpAndSettle();
    expect(find.byKey(const ValueKey('kyc-unverified')), findsNothing);
    await tap(t, find.text('Refresh status & limits'));
    expect(find.byKey(const ValueKey('kyc-unverified')), findsOneWidget);
  });
  testWidgets('route guard preserves draft when navigation is cancelled', (
    t,
  ) async {
    await open(t);
    await tap(t, find.byKey(const ValueKey('kyc-start')));
    await tap(t, find.byKey(const ValueKey('pick-passport')));
    final router = GoRouter.of(t.element(find.text('Verification & limits')));
    router.go('/');
    await t.pumpAndSettle();
    expect(find.byType(AlertDialog), findsOneWidget);
    await tap(t, find.text('Keep editing'));
    expect(find.byKey(const ValueKey('pick-passport')), findsOneWidget);
    router.go('/');
    await t.pumpAndSettle();
    await tap(t, find.text('Discard & leave'));
    expect(find.byKey(const ValueKey('kyc-start')), findsNothing);
    expect(find.text('Explore your accounts'), findsOneWidget);
  });
  testWidgets('overview controls have accessible labels and touch targets', (
    t,
  ) async {
    final semantics = t.ensureSemantics();
    await open(t);
    expect(t, meetsGuideline(labeledTapTargetGuideline));
    expect(t, meetsGuideline(androidTapTargetGuideline));
    final start = find.byKey(const ValueKey('kyc-start'));
    await t.ensureVisible(start);
    final buttonContext = t.element(start);
    FocusScope.of(buttonContext).requestFocus(Focus.of(buttonContext));
    await t.sendKeyEvent(LogicalKeyboardKey.tab);
    await t.pump();
    expect(t.takeException(), null);
    semantics.dispose();
  });
}