// Guided-setup wizard — the three explained answer steps. Verifies
// that options render as localized cards with their one-line
// explanation (no English enum humanization) and that Weiter/Zurück
// walk the steps. CLI calls run through the SystemActions test seam
// so the error paths (stale binary, generic failure) are covered
// without a subprocess.

import 'dart:io' show Directory, Platform;

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

import 'package:chain_studio/data/chain_log.dart';
import 'package:chain_studio/data/system_actions.dart';
import 'package:chain_studio/l10n/app_localizations.dart';
import 'package:chain_studio/widgets/guided_setup_dialog.dart';

Widget _host() => MaterialApp(
  locale: const Locale('de'),
  localizationsDelegates: AppLocalizations.localizationsDelegates,
  supportedLocales: AppLocalizations.supportedLocales,
  home: Builder(
    builder: (context) => Scaffold(
      body: Center(
        child: ElevatedButton(
          onPressed: () => GuidedSetupDialog.show(context),
          child: const Text('open'),
        ),
      ),
    ),
  ),
);

/// Host that opens the dialog pre-seeded on the review / applied
/// step with [plan] (the parsed `--plan-json` shape), bypassing the
/// CLI subprocess.
Widget _seededHost(Map<String, dynamic> plan, {bool applied = false}) =>
    MaterialApp(
      locale: const Locale('de'),
      localizationsDelegates: AppLocalizations.localizationsDelegates,
      supportedLocales: AppLocalizations.supportedLocales,
      home: Builder(
        builder: (context) => Scaffold(
          body: Center(
            child: ElevatedButton(
              onPressed: () => showDialog<void>(
                context: context,
                builder: (_) =>
                    GuidedSetupDialog(debugPlan: plan, debugApplied: applied),
              ),
              child: const Text('open'),
            ),
          ),
        ),
      ),
    );

Map<String, dynamic> _regulatedPlan({bool signed = true}) => {
  'profile': 'enterprise',
  'modules': ['text.extract', 'text.summarize'],
  'starter_flow': 'extract-summarize',
  'runbook': 'service',
  'curated_docs': <String>[],
  'require_signatures': signed,
  'worm_audit': false,
  'approval_step': true,
};

void main() {
  testWidgets('step 1 shows scenario options in German with explanations', (
    tester,
  ) async {
    await tester.pumpWidget(_host());
    await tester.tap(find.text('open'));
    await tester.pumpAndSettle();

    // Step counter + localized (German) scenario labels, not the
    // English enum humanization.
    expect(find.text('Schritt 1 von 3'), findsOneWidget);
    expect(find.text('Regulierter Produktivbetrieb'), findsOneWidget);
    expect(find.text('Erst mal ausprobieren'), findsOneWidget);
    // Each option carries its one-line explanation.
    expect(
      find.textContaining('menschliche Freigabe vor jedem KI-Schritt'),
      findsOneWidget,
    );
    // No leaked English enum labels.
    expect(find.text('Regulated Production'), findsNothing);
    expect(find.text('Trying Out'), findsNothing);
  });

  testWidgets('Weiter/Zurück walk the three answer steps', (tester) async {
    await tester.pumpWidget(_host());
    await tester.tap(find.text('open'));
    await tester.pumpAndSettle();

    // Step 1 → 2 (task).
    await tester.tap(find.text('Weiter'));
    await tester.pumpAndSettle();
    expect(find.text('Schritt 2 von 3'), findsOneWidget);
    expect(find.text('Text aus Dokumenten extrahieren'), findsOneWidget);

    // Step 2 → 3 (environment) shows the two plain-language toggles.
    await tester.tap(find.text('Weiter'));
    await tester.pumpAndSettle();
    expect(find.text('Schritt 3 von 3'), findsOneWidget);
    expect(find.text('Dieser Rechner'), findsOneWidget);
    expect(
      find.text('Vor jedem KI-Schritt einen Menschen um Freigabe bitten'),
      findsOneWidget,
    );

    // Zurück returns to step 2.
    await tester.tap(find.text('Zurück'));
    await tester.pumpAndSettle();
    expect(find.text('Schritt 2 von 3'), findsOneWidget);
  });

  testWidgets(
    'review of a regulated plan explains the signature dead end and offers the relaxation switch',
    (tester) async {
      await tester.pumpWidget(_seededHost(_regulatedPlan()));
      await tester.tap(find.text('open'));
      await tester.pumpAndSettle();

      // The plain-language notice + the deliberate one-click switch.
      expect(
        find.textContaining('Der öffentliche Store liefert zurzeit unsignierte Pakete'),
        findsOneWidget,
      );
      expect(
        find.text('Installation aus dem öffentlichen Store erlauben'),
        findsOneWidget,
      );
      // No raw CLI prose anywhere.
      expect(find.textContaining('chain install'), findsNothing);
    },
  );

  testWidgets(
    'applied state renders clickable next steps — start hub, per-module install, open flow',
    (tester) async {
      await tester.pumpWidget(
        _seededHost(_regulatedPlan(signed: false), applied: true),
      );
      await tester.tap(find.text('open'));
      await tester.pumpAndSettle();

      expect(find.text('Fertig — Ch∆In ist eingerichtet.'), findsOneWidget);
      // Hub not probed up in tests → the start action + the
      // install-needs-hub hint show, and install buttons exist
      // (disabled) for each plan module.
      expect(find.text('Hub starten'), findsOneWidget);
      expect(
        find.textContaining('Starten Sie zuerst den Hub'),
        findsOneWidget,
      );
      expect(find.text('text.extract installieren'), findsOneWidget);
      expect(find.text('text.summarize installieren'), findsOneWidget);
      expect(
        find.text('Beispiel-Flow „extract-summarize“ öffnen'),
        findsOneWidget,
      );
      // No CLI text in the GUI path.
      expect(find.textContaining('chain serve'), findsNothing);
      expect(find.textContaining('chain install'), findsNothing);
    },
  );

  testWidgets(
    'applied regulated (signed) state stays clickable — signed-source dialog, trust hint, install buttons',
    (tester) async {
      await tester.pumpWidget(_seededHost(_regulatedPlan(), applied: true));
      await tester.tap(find.text('open'));
      await tester.pumpAndSettle();

      // The plain-language story + the pin-the-publisher trust hint.
      expect(find.textContaining('signierten Quelle'), findsOneWidget);
      expect(
        find.textContaining('Schlüssel des Herausgebers'),
        findsOneWidget,
      );
      // No dead end: the stores dialog (with its pin-a-key field) is
      // one click away, and the installs stay available for after
      // the source is added.
      expect(find.text('Signierte Quelle hinzufügen…'), findsOneWidget);
      expect(find.text('text.extract installieren'), findsOneWidget);
      expect(find.textContaining('chain store add'), findsNothing);
    },
  );

  testWidgets(
    'review preview names the machine being set up and the audit chain',
    (tester) async {
      await tester.pumpWidget(_seededHost(_regulatedPlan()));
      await tester.tap(find.text('open'));
      await tester.pumpAndSettle();

      // Runbook honesty: a "home server" target still configures
      // THIS machine — the preview must say so.
      expect(
        find.textContaining('Eingerichtet wird dieser Rechner'),
        findsOneWidget,
      );
      // The regulated promise is stated even when WORM is off:
      // the hash-chained audit log line is always there.
      expect(
        find.textContaining('hash-verketteten Prüfprotokoll'),
        findsOneWidget,
      );
    },
  );

  testWidgets(
    'step 1 offers the free-text path with an honest no-AI fallback hint',
    (tester) async {
      await tester.pumpWidget(
        MaterialApp(
          locale: const Locale('de'),
          localizationsDelegates: AppLocalizations.localizationsDelegates,
          supportedLocales: AppLocalizations.supportedLocales,
          home: Builder(
            builder: (context) => Scaffold(
              body: Center(
                child: ElevatedButton(
                  onPressed: () => showDialog<void>(
                    context: context,
                    builder: (_) =>
                        const GuidedSetupDialog(debugSkipAiProbe: true),
                  ),
                  child: const Text('open'),
                ),
              ),
            ),
          ),
        ),
      );
      await tester.tap(find.text('open'));
      await tester.pumpAndSettle();

      expect(
        find.text('Oder beschreiben Sie einfach, was Sie vorhaben'),
        findsOneWidget,
      );
      // No system AI configured → honest fallback: the menu always
      // works; no dead end, no disabled mystery button.
      expect(
        find.textContaining('Die Auswahl oben funktioniert immer'),
        findsOneWidget,
      );
      expect(find.text('Vorschlagen lassen'), findsNothing);
    },
  );

  group('CLI paths (SystemActions test seam)', () {
    late Directory tmp;

    setUp(() {
      tmp = Directory.systemTemp.createTempSync('wizard-test-');
      ChainLog.testPathOverride = '${tmp.path}/studio-errors.log';
    });

    tearDown(() {
      ChainLog.testPathOverride = null;
      SystemActions.debugRunFaiOverride = null;
      SystemActions.debugResolveOverride = null;
      tmp.deleteSync(recursive: true);
    });

    Future<void> walkToStep3(WidgetTester tester) async {
      await tester.pumpWidget(_host());
      await tester.tap(find.text('open'));
      await tester.pumpAndSettle();
      await tester.tap(find.text('Weiter'));
      await tester.pumpAndSettle();
      await tester.tap(find.text('Weiter'));
      await tester.pumpAndSettle();
      expect(find.text('Schritt 3 von 3'), findsOneWidget);
    }

    testWidgets('a stray click outside the wizard does not dismiss it', (
      tester,
    ) async {
      await tester.pumpWidget(_host());
      await tester.tap(find.text('open'));
      await tester.pumpAndSettle();
      expect(find.text('Schritt 1 von 3'), findsOneWidget);

      // The exact click that used to end the wizard: aiming at an
      // error SnackBar dimmed below the modal barrier.
      await tester.tapAt(const Offset(4, 4));
      await tester.pumpAndSettle();
      expect(find.text('Schritt 1 von 3'), findsOneWidget);
    });

    testWidgets(
      'stale chain binary → explained, copyable error dialog above the intact wizard',
      (tester) async {
        const clapError =
            "error: unexpected argument '--plan-json' found\n\n"
            "  tip: a similar argument exists: '--plan-out'\n\n"
            'Usage: chain init --answers <ANSWERS> --plan-out <PLAN_OUT>';
        SystemActions.debugResolveOverride = () => '/Users/op/.chain/bin/chain';
        SystemActions.debugRunFaiOverride = (args) async =>
            (ok: false, stdout: '', stderr: clapError);

        final copied = <String>[];
        tester.binding.defaultBinaryMessenger.setMockMethodCallHandler(
          SystemChannels.platform,
          (call) async {
            if (call.method == 'Clipboard.setData') {
              copied.add((call.arguments as Map)['text'] as String);
            }
            return null;
          },
        );

        await walkToStep3(tester);
        await tester.tap(find.text('Weiter')); // triggers `chain init`
        await tester.pumpAndSettle();

        // Plain-language headline naming the skew — not a raw clap
        // usage wall — plus the binary that was executed.
        expect(find.textContaining('älter als Studio'), findsOneWidget);
        expect(
          find.textContaining('/Users/op/.chain/bin/chain'),
          findsWidgets,
        );

        // The verbatim CLI output is one copy-click away (the old
        // SnackBar rendition sat behind the modal barrier where the
        // copy button could not be reached at all).
        await tester.tap(find.byIcon(Icons.content_copy));
        await tester.pump();
        expect(copied, hasLength(1));
        expect(copied.single, contains('unexpected argument'));
        // Let the button's transient "copied" checkmark reset so no
        // timer outlives the test.
        await tester.pump(const Duration(seconds: 2));

        // Dismissing the error returns to the intact wizard — the
        // failure must not cost the operator their answers.
        await tester.tap(find.text('OK'));
        await tester.pumpAndSettle();
        expect(find.text('Schritt 3 von 3'), findsOneWidget);
      },
    );

    testWidgets('generic init failure names the executed binary', (
      tester,
    ) async {
      SystemActions.debugResolveOverride = () => '/Users/op/.chain/bin/chain';
      SystemActions.debugRunFaiOverride = (args) async =>
          (ok: false, stdout: '', stderr: 'boom: config unreadable');

      await walkToStep3(tester);
      await tester.tap(find.text('Weiter'));
      await tester.pumpAndSettle();

      expect(
        find.textContaining('Die Plan-Vorschau konnte nicht erstellt werden'),
        findsOneWidget,
      );
      expect(find.textContaining('Ausgeführt wurde:'), findsOneWidget);
    });

    testWidgets('step 3 announces which binary the wizard will run', (
      tester,
    ) async {
      SystemActions.debugResolveOverride = () => '/Users/op/.chain/bin/chain';
      SystemActions.debugRunFaiOverride = (args) async =>
          (ok: false, stdout: '', stderr: 'unused');

      await walkToStep3(tester);
      expect(
        find.textContaining('führt Studio das Programm „chain“ aus'),
        findsOneWidget,
      );
      expect(
        find.textContaining('/Users/op/.chain/bin/chain'),
        findsOneWidget,
      );
    });

    testWidgets(
      'step 3 pre-explains the macOS folder prompt for a Documents-resident binary',
      (tester) async {
        final home = Platform.environment['HOME'];
        if (!Platform.isMacOS || home == null || home.isEmpty) {
          return; // TCC folder prompts are a macOS-only concern.
        }
        SystemActions.debugResolveOverride = () => '$home/Documents/dev/chain';
        SystemActions.debugRunFaiOverride = (args) async =>
            (ok: false, stdout: '', stderr: 'unused');

        await walkToStep3(tester);
        expect(
          find.textContaining('nach Zugriff auf diesen Ordner'),
          findsOneWidget,
        );
      },
    );

    testWidgets('step 3 says so when no chain binary can be found', (
      tester,
    ) async {
      SystemActions.debugResolveOverride = () => null;

      await walkToStep3(tester);
      expect(
        find.textContaining('wurde auf diesem Rechner nicht gefunden'),
        findsOneWidget,
      );
    });
  });

  group('parseSetupSuggestion', () {
    test('accepts a valid JSON object embedded in prose', () {
      final r = parseSetupSuggestion(
        'Sure! Here is the mapping:\n'
        '{"scenario":"regulated-production","intent":"classify-documents",'
        '"target":"home-server","require_approval":true,'
        '"data_must_stay_local":false}\n'
        'Let me know if you need anything else.',
      );
      expect(r, isNotNull);
      expect(r!['scenario'], 'regulated-production');
      expect(r['intent'], 'classify-documents');
      expect(r['target'], 'home-server');
      expect(r['require_approval'], true);
      expect(r['data_must_stay_local'], false);
    });

    test('rejects hallucinated enum values', () {
      expect(
        parseSetupSuggestion(
          '{"scenario":"world-domination","intent":"hello-world",'
          '"target":"this-laptop"}',
        ),
        isNull,
      );
    });

    test('rejects non-JSON replies', () {
      expect(parseSetupSuggestion('I cannot help with that.'), isNull);
      expect(parseSetupSuggestion('{broken json'), isNull);
    });

    test('missing booleans default to false', () {
      final r = parseSetupSuggestion(
        '{"scenario":"trying-out","intent":"hello-world",'
        '"target":"this-laptop"}',
      );
      expect(r, isNotNull);
      expect(r!['require_approval'], false);
      expect(r['data_must_stay_local'], false);
    });
  });
}