// Deterministic operator-guide screenshot harness (one command
// instead of the fragile cliclick/screencapture procedure).
//
// Boots a hermetic hub (HubFixture: temp data dir, free port),
// seeds deterministic demo data via the CLI (an open "Bürgeramt"
// project; optionally a sealed "Ratsinformation" when the runner
// confirms an isolated $HOME), launches the real app in German +
// dark mode against that hub, walks every sidebar destination in
// nav order, opens the workspace switcher and the guided-setup
// wizard, and writes the guide PNGs via a RepaintBoundary capture
// (driverless — works headed on macOS with plain `flutter test`).
//
// Run through the platform repo's scripts/regen-studio-guide.sh,
// which isolates $HOME, builds the hub binary, and copies the
// PNGs into fai_chain/docs/studio/images/. Direct invocation:
//
//   flutter test integration_test/guide_shots_test.dart -d macos
//
// Output lands in build/guide-shots/ unless GUIDE_SHOTS_OUT is
// set in the environment.
//
// Hermeticity notes:
// - SharedPreferences is mocked empty — the operator's real Studio
//   prefs are neither read nor written.
// - The app reconnects to the fixture hub with persist: false.
// - The sealed seed writes to $HOME/.chain/sealed/ by design, so
//   it only runs when CHAIN_GUIDE_SHOTS_SEALED=1 confirms the
//   caller isolated $HOME (the regen script does).

import 'dart:io';
import 'dart:ui' as ui;

import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
import 'package:flutter/services.dart' show LogicalKeyboardKey;
import 'package:flutter_test/flutter_test.dart';
import 'package:integration_test/integration_test.dart';
import 'package:shared_preferences/shared_preferences.dart';

import 'package:chain_client_sdk/chain_client_sdk.dart' show HubEndpoint;
import 'package:chain_studio/data/hub.dart';
import 'package:chain_studio/main.dart';
import 'package:chain_studio/widgets/widgets.dart';

import '../test/integration/hub_fixture.dart';

final GlobalKey _shotKey = GlobalKey();

/// Pump a fixed number of frames instead of pumpAndSettle: the
/// sidebar clock ticks every second, so the tree never settles and
/// pumpAndSettle degenerates into its multi-minute timeout.
Future<void> _pumpFrames(WidgetTester tester, [int frames = 20]) async {
  for (var i = 0; i < frames; i++) {
    await tester.pump(const Duration(milliseconds: 100));
  }
}

/// Pump until [finder] matches (page content arrived) or ~10 s
/// pass — pages load their data from the hub asynchronously, and a
/// blind fixed wait raced the slower ones (the flows editor).
Future<void> _pumpUntil(
  WidgetTester tester,
  Finder finder, {
  int maxFrames = 100,
}) async {
  for (var i = 0; i < maxFrames; i++) {
    if (finder.evaluate().isNotEmpty) return;
    await tester.pump(const Duration(milliseconds: 100));
  }
}

String get _outDir =>
    Platform.environment['GUIDE_SHOTS_OUT'] ?? 'build/guide-shots';

/// Guide images ship dark; GUIDE_SHOTS_THEME=light exists for the
/// light-parity proof runs (release gate: both themes must hold).
ThemeModeValue get _theme =>
    Platform.environment['GUIDE_SHOTS_THEME'] == 'light'
    ? ThemeModeValue.light
    : ThemeModeValue.dark;

/// Guide images ship German; GUIDE_SHOTS_LOCALE=en exists for
/// English-parity proof runs.
Locale get _locale => Locale(
  Platform.environment['GUIDE_SHOTS_LOCALE'] == 'en' ? 'en' : 'de',
);

/// Rasterize the app's RepaintBoundary into `<outDir>/<name>.png`.
Future<void> _shot(WidgetTester tester, String name) async {
  // Two extra frames so ripples/route transitions settle visually.
  await tester.pump(const Duration(milliseconds: 120));
  await tester.pump(const Duration(milliseconds: 120));
  final boundary =
      _shotKey.currentContext!.findRenderObject() as RenderRepaintBoundary;
  final image = await boundary.toImage(pixelRatio: 2.0);
  final bytes = await image.toByteData(format: ui.ImageByteFormat.png);
  image.dispose();
  final file = File('$_outDir/$name.png');
  file.parent.createSync(recursive: true);
  file.writeAsBytesSync(bytes!.buffer.asUint8List());
  // ignore: avoid_print
  print('guide-shot: ${file.path}');
}

Future<void> _cli(
  String binary,
  HubFixture fixture,
  List<String> args,
) async {
  final r = await Process.run(
    binary,
    args,
    environment: {
      ...Platform.environment,
      'CHAIN_DATA_DIR': fixture.tempDir.path,
      'CHAIN_MODULES_DIR': '${fixture.tempDir.path}/modules',
    },
  );
  if (r.exitCode != 0) {
    fail('seed command `chain ${args.join(' ')}` failed: ${r.stderr}');
  }
}

/// The guide's image set, in sidebar (= Cmd number) order. Must
/// stay aligned with docs/nav.generated.json — the nav guard in
/// the platform repo keeps the guide itself honest.
const _pageShots = [
  ('welcome', '01-willkommen'),
  ('store', '02-store'),
  ('doctor', '03-diagnose'),
  ('flows', '04-flows'),
  ('audit', '05-protokoll'),
  ('approvals', '06-freigaben'),
  ('runs', '07-laeufe'),
  ('federation', '08-foederation'),
];

void main() {
  IntegrationTestWidgetsFlutterBinding.ensureInitialized();

  testWidgets('capture the operator-guide screenshots', (tester) async {
    final fixture = await HubFixture.start(skipIfBinaryMissing: false);
    addTearDown(fixture!.dispose);
    final binary = (await HubFixture.binaryPath())!;

    // Deterministic demo data. The slug is explicit — the derived
    // one would drop the umlaut ("brgeramt").
    await _cli(binary, fixture, [
      'project',
      'create',
      'Bürgeramt',
      '--slug',
      'buergeramt',
      '--color',
      '#2e8f9e',
    ]);
    // The sealed area writes a manifest under $HOME/.chain/sealed/,
    // so it needs the runner's confirmation that $HOME is isolated.
    final sealedSeed =
        Platform.environment['CHAIN_GUIDE_SHOTS_SEALED'] == '1';
    if (sealedSeed) {
      await _cli(binary, fixture, [
        'project',
        'create',
        'Ratsinformation',
        '--slug',
        'ratsinformation',
        '--isolation',
        'sealed',
      ]);
      // Seed one audit event the guide can show (setup.applied) by
      // applying a minimal guided setup against the fixture's data
      // dir. Writes $HOME/.chain/config.yaml, hence the isolated-
      // $HOME guard: only the regen script's throwaway HOME is
      // ever touched.
      final answers = File('${fixture.tempDir.path}/seed-answers.yaml');
      answers.writeAsStringSync(
        'scenario: trying-out\nintent: hello-world\ntarget: this-laptop\n',
      );
      await _cli(binary, fixture, [
        'init',
        '--answers',
        answers.path,
        '--apply',
        '--force',
      ]);
    }

    // Hermetic prefs: never read or write the operator's real ones.
    SharedPreferences.setMockInitialValues({});

    await tester.pumpWidget(
      RepaintBoundary(
        key: _shotKey,
        child: StudioApp(
          initialThemeMode: _theme,
          initialLocale: _locale,
        ),
      ),
    );
    await HubService.instance.reconnect(
      HubEndpoint(host: '127.0.0.1', port: fixture.port),
      authToken: null,
      persist: false,
    );
    await _pumpFrames(tester, 30);

    final shell =
        tester.state<StudioShellState>(find.byType(StudioShell));

    // 01–08: every sidebar destination, in Cmd order. Where a page
    // loads slower content from the hub, wait for a sentinel that
    // proves the content arrived before capturing.
    for (final (id, shotName) in _pageShots) {
      shell.navigateTo(id);
      await _pumpFrames(tester);
      if (id == 'flows') {
        // The imported sample flows populate the file list.
        await _pumpUntil(tester, find.textContaining('extract-summarize'));
      } else if (id == 'audit') {
        // The seeded setup.applied event (isolated-$HOME runs).
        await _pumpUntil(tester, find.textContaining('setup.applied'));
      }
      await _shot(tester, shotName);
    }

    // 09: the workspace switcher, opened (shows the demo projects;
    // with the sealed seed also the shield entry).
    shell.navigateTo('audit');
    await _pumpFrames(tester);
    final switcher = find.byType(ChainWorkspaceSwitcher);
    if (switcher.evaluate().isNotEmpty) {
      await tester.tap(switcher.first);
      await _pumpFrames(tester);
      await _shot(tester, '09-projekt-umschalter');
      // Close the menu again before moving on.
      await tester.sendKeyEvent(LogicalKeyboardKey.escape);
      await _pumpFrames(tester, 5);
    }

    // 11: the guided-setup wizard, step 1 (localized option cards).
    // 10 (inside a sealed area) still needs the manual procedure —
    // it requires switching to a second, isolated hub instance.
    // The wizard no longer lives on Welcome (first-run gate owns a
    // fresh install; re-running is a Settings action) — capture it
    // via Settings → General like an operator would reach it.
    shell.navigateTo('welcome');
    await _pumpFrames(tester);
    await tester.sendKeyEvent(LogicalKeyboardKey.escape); // close leftovers
    await _pumpFrames(tester, 5);
    ChainSettingsDialog.show(tester.element(find.byType(StudioShell)));
    await _pumpFrames(tester);
    final runSetup = find.textContaining(
      _locale.languageCode == 'en' ? 'Run setup again' : 'Einrichtung erneut',
    );
    if (runSetup.evaluate().isNotEmpty) {
      await tester.ensureVisible(runSetup.first);
      await tester.tap(runSetup.first);
      await _pumpFrames(tester);
      await _shot(tester, '11-einrichtung');
      await tester.sendKeyEvent(LogicalKeyboardKey.escape);
      await _pumpFrames(tester, 5);
      await tester.sendKeyEvent(LogicalKeyboardKey.escape); // settings too
      await _pumpFrames(tester, 5);
    }
  });
}