import 'dart:io';

import 'package:test/test.dart';

/// halkyon.li's first `.env` (ADR 0039; the developer's choices of 8 Nov 2026):
/// every secret made fresh on the host, halkyon.li's settings, and never an existing
/// file overwritten, as the session peppers must never change once people sign in.
void main() {
  const script = 'deploy/host/halkyon-li-env.sh';

  late Directory folder;
  setUp(() => folder = Directory.systemTemp.createTempSync('halkyon-li-env'));
  tearDown(() => folder.deleteSync(recursive: true));

  ProcessResult make(String target) => Process.runSync('sh', [script, target]);

  Map<String, String> settings(String text) => {
    for (final line in text.split('\n'))
      if (line.isNotEmpty && !line.startsWith('#'))
        line.substring(0, line.indexOf('=')): line.substring(
          line.indexOf('=') + 1,
        ),
  };

  group('a new .env', () {
    late Map<String, String> env;
    late File file;

    setUp(() {
      file = File('${folder.path}/.env');
      final result = make(file.path);
      expect(result.exitCode, 0, reason: '${result.stderr}');
      env = settings(file.readAsStringSync());
    });

    test('is readable by its owner alone', () {
      expect(file.statSync().modeString(), 'rw-------');
    });

    test("makes every secret fresh, each of 32 bytes, none another's", () {
      const secrets = [
        'INSTANCE_SECRET',
        'LEARN_POSTGRES_PASSWORD',
        'LEARN_SESSION_KEY_HASH_PEPPER',
        'SIGN_IN_DECOY_KEY',
        'TRAIN_POSTGRES_PASSWORD',
        'TRAIN_SESSION_KEY_HASH_PEPPER',
        'MAP_KEY_SECRET',
        'TODO_POSTGRES_PASSWORD',
        'TODO_SESSION_KEY_HASH_PEPPER',
        'MEDITATE_POSTGRES_PASSWORD',
        'MEDITATE_SESSION_KEY_HASH_PEPPER',
      ];
      for (final name in secrets) {
        expect(env[name], matches(RegExp(r'^[0-9a-f]{64}$')), reason: name);
      }
      expect(
        secrets.map((name) => env[name]).toSet(),
        hasLength(secrets.length),
      );
    });

    test('differs from the next one made', () {
      final other = File('${folder.path}/other.env');
      make(other.path);
      expect(
        settings(other.readAsStringSync())['INSTANCE_SECRET'],
        isNot(env['INSTANCE_SECRET']),
      );
    });

    test("serves halkyon.li's names, handles on halkyon.li itself (D7)", () {
      expect(env['LEARN_DOMAIN'], 'learn.halkyon.li');
      expect(env['LEARN_PUBLIC_HOST'], 'learn.halkyon.li');
      expect(env['ACCOUNT_DOMAIN'], 'halkyon.li');
      expect(env['TRAIN_DOMAIN'], 'train.halkyon.li');
      expect(env['TODO_DOMAIN'], 'todo.halkyon.li');
      expect(env['MEDITATE_DOMAIN'], 'meditate.halkyon.li');
      expect(env['JELLYFIN_DOMAIN'], 'jellyfin.halkyon.li');
    });

    test('lets people in through SimpleLogin alone, once an operator '
        'approves them, and mails nothing', () {
      expect(env['SIGN_IN_WAYS'], 'simplelogin');
      expect(env['SIGN_UP'], 'approval');
      expect(env['SIMPLELOGIN_CLIENT_ID'], isEmpty);
      expect(env['SIMPLELOGIN_CLIENT_SECRET'], isEmpty);
      for (final name in [
        'EMAIL_SIGN_IN_PEPPER',
        'EMAIL_SMTP_HOST',
        'TOTP_KEY',
        'RECOVERY_CODE_KEY',
      ]) {
        expect(env[name] ?? '', isEmpty, reason: name);
      }
    });

    test('runs everything chosen, behind the forward, each file there', () {
      final files = env['COMPOSE_FILE']!.split(':');
      expect(files, [
        'compose.learn.yaml',
        'compose.jellyfin.yaml',
        'compose.languagetool.yaml',
        'compose.train.yaml',
        'compose.maps.yaml',
        'compose.search.yaml',
        'compose.todo.yaml',
        'compose.todo-search.yaml',
        'compose.meditate.yaml',
        'compose.forwarded.yaml',
      ]);
      for (final name in files) {
        expect(File('deploy/$name').existsSync(), isTrue, reason: name);
      }
    });

    test("keeps Train's map and routes to southern Bavaria, its search to "
        'Germany, in memory beside the rest', () {
      expect(env['MAP_REGION'], '10,47.2,13.9,49');
      expect(env['BROUTER_REGION'], '10,45,15,50');
      expect(env['PHOTON_REGION'], 'europe/germany');
      expect(env['PHOTON_HEAP'], '2g');
      expect(env['PHOTON_MEMORY'], '3g');
    });

    test('says Germany for the data and the backups, and reads the library '
        'from the HDD', () {
      expect(env['DATA_LOCATION'], 'DE');
      expect(env['BACKUP_LOCATION'], 'DE');
      expect(env['JELLYFIN_MEDIA'], '/data/media');
      expect(env.containsKey('MEDITATE_LIBRARY'), isFalse);
    });
  });

  test('never overwrites an existing .env, whose peppers must stay', () {
    final file = File('${folder.path}/.env')..writeAsStringSync('KEPT=1\n');
    final result = make(file.path);
    expect(result.exitCode, isNot(0));
    expect(result.stderr, contains('exists'));
    expect(file.readAsStringSync(), 'KEPT=1\n');
  });
}