// Reviewer identity on the surfaces that write it — approvals page
// and the audit-log wipe.
//
// Guard for the legal finding of the 2026-07-26 usertest: the hub
// stores whatever reviewer string a client sends as `decided_by`,
// so Studio must (a) never send a bare handle that reads like a
// proven identity, (b) tell the reviewer BEFORE the decision what
// the attribution is worth on this hub, and (c) present a stored
// value by what it actually proves.
//
// Runs against the scriptable FakeHubService — never a real hub.

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

import 'package:chain_studio/data/hub.dart';
import 'package:chain_studio/data/reviewer_identity.dart';
import 'package:chain_studio/main.dart';

import 'support/fake_hub.dart';

String _allText(WidgetTester tester) {
  final buf = StringBuffer();
  for (final w in tester.widgetList<Text>(find.byType(Text))) {
    buf.writeln(w.data ?? w.textSpan?.toPlainText() ?? '');
  }
  for (final w in tester.widgetList<SelectableText>(
    find.byType(SelectableText),
  )) {
    buf.writeln(w.data ?? '');
  }
  return buf.toString();
}

ApprovalRecord _pending() => ApprovalRecord(
  id: 'apr-1',
  flowName: 'classify-and-file',
  stepId: 'review',
  prompt: 'Bitte die Klassifikation prüfen',
  payloadPreview: '{"label":"Rechnung"}',
  createdAt: DateTime.utc(2026, 7, 26, 12, 0, 0),
  expiresAt: null,
  status: 'pending',
  decidedAt: null,
  decidedBy: '',
  reason: '',
  project: 'lbs',
  flowExecution: 'run-abc123',
);

ApprovalRecord _decided(String decidedBy) => ApprovalRecord(
  id: 'apr-2',
  flowName: 'classify-and-file',
  stepId: 'review',
  prompt: 'Bitte die Klassifikation prüfen',
  payloadPreview: null,
  createdAt: DateTime.utc(2026, 7, 26, 12, 0, 0),
  expiresAt: null,
  status: 'approved',
  decidedAt: DateTime.utc(2026, 7, 26, 12, 5, 0),
  decidedBy: decidedBy,
  reason: '',
  project: 'lbs',
  flowExecution: 'run-abc123',
);

/// Fixed frame budget instead of `pumpAndSettle`: the page keeps a
/// progress indicator alive on the hidden tab, so settling never
/// completes (same reason the origin suite pumps explicitly).
Future<void> _frames(WidgetTester tester, [int count = 12]) async {
  for (var i = 0; i < count; i++) {
    await tester.pump(const Duration(milliseconds: 200));
  }
}

/// Boot Studio on the approvals page against [fake].
Future<void> _openApprovals(WidgetTester tester, FakeHubService fake) async {
  SharedPreferences.setMockInitialValues({});
  tester.view.physicalSize = const Size(1280, 900);
  tester.view.devicePixelRatio = 1.0;
  addTearDown(tester.view.reset);
  await tester.pumpWidget(
    const StudioApp(
      initialThemeMode: ThemeModeValue.dark,
      initialLocale: Locale('de'),
    ),
  );
  await tester.pump(const Duration(milliseconds: 100));
  await tester.tap(find.byKey(const ValueKey('sidebar-item-approvals')));
  for (var i = 0; i < 12; i++) {
    await tester.pump(const Duration(milliseconds: 200));
  }
}

Future<void> _teardownFrames(WidgetTester tester) async {
  await tester.pumpWidget(const SizedBox.shrink());
  await tester.pump(const Duration(minutes: 1));
}

void main() {
  setUp(() => ReviewerIdentity.debugHandle = 'stefan@studio');
  tearDown(() => ReviewerIdentity.debugHandle = null);

  testWidgets('the inbox names who will be recorded, flags the claim as '
      'unchecked and shows the literal stored value', (tester) async {
    final fake = installFakeHub();
    fake.approvals = [_pending()];
    await _openApprovals(tester, fake);
    final text = _allText(tester);

    expect(text, contains('Sie entscheiden als'));
    expect(text, contains('stefan@studio'));
    expect(text, contains('nicht überprüft'));
    // No surprise later: the exact string that lands in decided_by.
    expect(text, contains('unverified:stefan@studio'));
    await _teardownFrames(tester);
  });

  testWidgets('an anonymous hub says a decision cannot be pinned on '
      'anyone', (tester) async {
    final fake = installFakeHub();
    fake.approvals = [_pending()];
    // Default fake policy: static validator, anonymous allowed.
    await _openApprovals(tester, fake);
    expect(_allText(tester), contains('ohne Zugangsdaten'));
    await _teardownFrames(tester);
  });

  testWidgets('an auth-enabled hub says the access is checked but the '
      'name is not', (tester) async {
    final fake = installFakeHub();
    fake.approvals = [_pending()];
    fake.authPolicy = const HubAuthPolicy(
      validator: 'static',
      anonymousAllowed: false,
      tokens: [],
    );
    await _openApprovals(tester, fake);
    expect(_allText(tester), contains('prüft Ihren Zugang'));
    await _teardownFrames(tester);
  });

  testWidgets('an unreadable auth policy stays honest instead of '
      'guessing', (tester) async {
    final fake = installFakeHub();
    fake.approvals = [_pending()];
    // AuthStatus is admin-scoped: a plain reviewer token is denied.
    fake.authPolicy = null;
    await _openApprovals(tester, fake);
    expect(_allText(tester), contains('Admin-Rechte'));
    // Still flagged — not knowing never upgrades the attribution.
    expect(_allText(tester), contains('nicht überprüft'));
    await _teardownFrames(tester);
  });

  testWidgets('approving sends the marked attribution, never a bare '
      'handle', (tester) async {
    final fake = installFakeHub();
    fake.approvals = [_pending()];
    await _openApprovals(tester, fake);

    await tester.tap(find.widgetWithText(FilledButton, 'Freigeben').first);
    for (var i = 0; i < 8; i++) {
      await tester.pump(const Duration(milliseconds: 200));
    }

    expect(fake.decisions, hasLength(1));
    expect(fake.decisions.single.id, 'apr-1');
    expect(fake.decisions.single.reviewer, 'unverified:stefan@studio');
    expect(
      fake.decisions.single.reviewer,
      startsWith(kUnverifiedReviewerPrefix),
      reason: 'the decide path must not claim an identity Studio '
          'cannot prove',
    );
    await _teardownFrames(tester);
  });

  testWidgets('rejecting sends the marked attribution too', (tester) async {
    final fake = installFakeHub();
    fake.approvals = [_pending()];
    await _openApprovals(tester, fake);

    await tester.tap(find.widgetWithText(OutlinedButton, 'Ablehnen').first);
    await _frames(tester);
    await tester.enterText(find.byType(TextField).last, 'Beleg fehlt');
    await _frames(tester);
    await tester.tap(find.widgetWithText(FilledButton, 'Ablehnen').last);
    for (var i = 0; i < 8; i++) {
      await tester.pump(const Duration(milliseconds: 200));
    }

    expect(fake.decisions, hasLength(1));
    expect(fake.decisions.single.reviewer, 'unverified:stefan@studio');
    expect(fake.decisions.single.reason, 'Beleg fehlt');
    await _teardownFrames(tester);
  });

  testWidgets('the history shows a marked value by its name and keeps '
      'the "unchecked" flag', (tester) async {
    final fake = installFakeHub();
    fake.approvals = [_decided('unverified:anna@ops')];
    await _openApprovals(tester, fake);
    await tester.tap(find.text('Verlauf'));
    await _frames(tester);

    final text = _allText(tester);
    expect(text, contains('anna@ops'));
    // The raw marker is not what a human should read in the list.
    expect(text, isNot(contains('unverified:anna@ops')));

    // The detail dialog spells the trust level out in words.
    await tester.tap(find.textContaining('classify-and-file').last);
    await _frames(tester);
    expect(_allText(tester), contains('anna@ops (nicht überprüft)'));
    await _teardownFrames(tester);
  });

  testWidgets('the audit-log wipe records the same kind of marked '
      'attribution in the chain.reset marker', (tester) async {
    // Same bug class as approvals: the reset marker names a
    // "Prüfer" the hub never checked, and auditors read exactly
    // that marker to explain a chain discontinuity.
    final fake = installFakeHub();
    SharedPreferences.setMockInitialValues({});
    tester.view.physicalSize = const Size(1280, 900);
    tester.view.devicePixelRatio = 1.0;
    addTearDown(tester.view.reset);
    await tester.pumpWidget(
      const StudioApp(
        initialThemeMode: ThemeModeValue.dark,
        initialLocale: Locale('de'),
      ),
    );
    await tester.pump(const Duration(milliseconds: 100));
    await tester.tap(find.byKey(const ValueKey('sidebar-item-audit')));
    await _frames(tester);

    await tester.tap(find.byTooltip('Weitere Aktionen'));
    await _frames(tester);
    // Tap the entry, not its label: the overflow menu's labels are
    // wider than the 256px menu, so the label's centre lies outside
    // the hit box (a separate, unrelated layout defect on that
    // menu). The entry itself is what the operator hits.
    await tester.tap(
      find.ancestor(
        of: find.textContaining('Entwicklungs-Reset'),
        matching: find.byType(PopupMenuItem<String>),
      ),
    );
    await _frames(tester);

    // The field says what will be stored, before it is stored.
    expect(_allText(tester), contains('unverified:'));

    await tester.enterText(find.byType(TextField).last, 'Testdaten verworfen');
    await _frames(tester);
    await tester.tap(find.widgetWithText(FilledButton, 'Log löschen'));
    await _frames(tester);

    expect(fake.clears, hasLength(1));
    expect(fake.clears.single.reviewer, 'unverified:stefan@studio');
    expect(fake.clears.single.reason, 'Testdaten verworfen');
    await _teardownFrames(tester);
  });

  testWidgets('a legacy / CLI value without a marker is shown as-is and '
      'never labelled either way', (tester) async {
    final fake = installFakeHub();
    fake.approvals = [_decided('ops-lead')];
    await _openApprovals(tester, fake);
    await tester.tap(find.text('Verlauf'));
    await _frames(tester);

    await tester.tap(find.textContaining('classify-and-file').last);
    await _frames(tester);
    final text = _allText(tester);
    expect(text, contains('ops-lead'));
    expect(
      text,
      isNot(contains('ops-lead (nicht überprüft)')),
      reason: 'Studio does not know where an unmarked value came '
          'from and must not classify it',
    );
    await _teardownFrames(tester);
  });
}