// Runs-monitor error classification — the page used to render
// every load failure as "hub not reachable", contradicting the
// sidebar's green "connected" dot whenever the hub answered but
// the RPC failed (usertest finding: a 0.21 hub without the
// ListInvocations RPC answered UNIMPLEMENTED and the page claimed
// the hub was down). These tests pin the classification and the
// widget rendition of each state.

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

import 'package:chain_studio/l10n/app_localizations.dart';
import 'package:chain_studio/pages/runs.dart';

/// Duck-typed stand-in for `GrpcError` — the classifier reads
/// `.code` and `.message` off whatever object arrives, exactly
/// like the friendly-error mapper does.
class _FakeGrpcError {
  final int code;
  final String? message;
  const _FakeGrpcError(this.code, [this.message]);

  @override
  String toString() => 'gRPC Error (code: $code, message: $message)';
}

Widget _host(Widget child) => MaterialApp(
  localizationsDelegates: AppLocalizations.localizationsDelegates,
  supportedLocales: AppLocalizations.supportedLocales,
  locale: const Locale('de'),
  home: Scaffold(body: child),
);

void main() {
  group('classifyRunsLoadError', () {
    test('UNIMPLEMENTED means the hub is too old, not unreachable', () {
      expect(
        classifyRunsLoadError(
          const _FakeGrpcError(12, 'grpc.Hub/ListInvocations unimplemented'),
        ),
        RunsLoadIssue.unsupported,
      );
    });

    test('FAILED_PRECONDITION from the detached gate is feature-off', () {
      expect(
        classifyRunsLoadError(
          const _FakeGrpcError(
            9,
            'detached invocations are not enabled — set detached.enabled: '
            'true in the operator config',
          ),
        ),
        RunsLoadIssue.featureDisabled,
      );
    });

    test('other FAILED_PRECONDITION errors keep their own story', () {
      expect(
        classifyRunsLoadError(const _FakeGrpcError(9, 'store busy')),
        RunsLoadIssue.other,
      );
    });

    test('UNAVAILABLE and DEADLINE_EXCEEDED are unreachable', () {
      expect(
        classifyRunsLoadError(const _FakeGrpcError(14, 'connection refused')),
        RunsLoadIssue.unreachable,
      );
      expect(
        classifyRunsLoadError(const _FakeGrpcError(4, 'deadline exceeded')),
        RunsLoadIssue.unreachable,
      );
    });

    test('socket-level failures without a gRPC code are unreachable', () {
      expect(
        classifyRunsLoadError(
          Exception('SocketException: Connection refused (port 50051)'),
        ),
        RunsLoadIssue.unreachable,
      );
    });

    test('arbitrary errors fall through to other', () {
      expect(
        classifyRunsLoadError(const FormatException('bad payload')),
        RunsLoadIssue.other,
      );
    });
  });

  group('RunsLoadErrorView', () {
    testWidgets('feature-off renders the plain-language empty state, '
        'never "not reachable"', (tester) async {
      await tester.pumpWidget(
        _host(
          RunsLoadErrorView(
            error: const _FakeGrpcError(
              9,
              'detached invocations are not enabled',
            ),
            issue: RunsLoadIssue.featureDisabled,
            onOpenGuide: () {},
          ),
        ),
      );
      await tester.pumpAndSettle();
      expect(find.text('Keine Läufe im Hintergrund'), findsOneWidget);
      expect(find.text('Anleitung öffnen'), findsOneWidget);
      expect(find.text('Hub nicht erreichbar'), findsNothing);
    });

    testWidgets('too-old hub says so and links to the doctor page', (
      tester,
    ) async {
      var doctorOpened = false;
      await tester.pumpWidget(
        _host(
          RunsLoadErrorView(
            error: const _FakeGrpcError(12, 'unimplemented'),
            issue: RunsLoadIssue.unsupported,
            onOpenGuide: () {},
            onOpenDoctor: () => doctorOpened = true,
          ),
        ),
      );
      await tester.pumpAndSettle();
      expect(
        find.text('Diese Ansicht braucht eine neuere Hub-Version'),
        findsOneWidget,
      );
      expect(find.text('Hub nicht erreichbar'), findsNothing);
      await tester.tap(find.text('Diagnose öffnen'));
      expect(doctorOpened, isTrue);
    });

    testWidgets('too-old hub leads with an in-place update button, '
        'doctor demoted to secondary', (tester) async {
      var updateTriggered = false;
      await tester.pumpWidget(
        _host(
          RunsLoadErrorView(
            error: const _FakeGrpcError(12, 'unimplemented'),
            issue: RunsLoadIssue.unsupported,
            onOpenGuide: () {},
            onOpenDoctor: () {},
            onUpdateHub: () => updateTriggered = true,
          ),
        ),
      );
      await tester.pumpAndSettle();
      // Primary CTA is the fix, not the detour.
      expect(find.text('Hub jetzt aktualisieren'), findsOneWidget);
      expect(find.text('Diagnose öffnen'), findsOneWidget);
      await tester.tap(find.text('Hub jetzt aktualisieren'));
      expect(updateTriggered, isTrue);
    });

    testWidgets('while updating, the button shows progress and is disabled', (
      tester,
    ) async {
      var updateTriggered = false;
      await tester.pumpWidget(
        _host(
          RunsLoadErrorView(
            error: const _FakeGrpcError(12, 'unimplemented'),
            issue: RunsLoadIssue.unsupported,
            onOpenGuide: () {},
            onOpenDoctor: () {},
            onUpdateHub: () => updateTriggered = true,
            updating: true,
          ),
        ),
      );
      // The spinner animates forever, so pump one frame rather than
      // pumpAndSettle (which would time out waiting for it to stop).
      await tester.pump();
      expect(find.text('Hub wird aktualisiert…'), findsOneWidget);
      // Disabled while in flight — a tap must not re-fire.
      await tester.tap(find.byType(FilledButton), warnIfMissed: false);
      expect(updateTriggered, isFalse);
    });

    testWidgets('a genuinely unreachable hub still says unreachable', (
      tester,
    ) async {
      await tester.pumpWidget(
        _host(
          RunsLoadErrorView(
            error: const _FakeGrpcError(14, 'connection refused'),
            issue: RunsLoadIssue.unreachable,
            onOpenGuide: () {},
          ),
        ),
      );
      await tester.pumpAndSettle();
      expect(find.text('Hub nicht erreichbar'), findsOneWidget);
    });

    testWidgets('other errors surface a copyable detail box', (tester) async {
      await tester.pumpWidget(
        _host(
          RunsLoadErrorView(
            error: const _FakeGrpcError(13, 'internal boom'),
            issue: RunsLoadIssue.other,
            onOpenGuide: () {},
          ),
        ),
      );
      await tester.pumpAndSettle();
      expect(find.text('Läufe konnten nicht geladen werden'), findsOneWidget);
      expect(find.text('Hub nicht erreichbar'), findsNothing);
      // The copy affordance is the hard rule: the detail box must
      // be present so the operator can copy the real message.
      expect(find.byIcon(Icons.content_copy), findsWidgets);
    });
  });
}