import 'dart:io';

import 'package:test/test.dart';
import 'package:yaml/yaml.dart';

import '../../tool/src/images.dart';

/// Meditate's server beside the instance (Halkyon Meditate's ADR 0038, step
/// 7; ADR 0039, D14), as Todo's: a member of the register, its own database
/// and role, its site, and the operator's library read-only (D16).
void main() {
  YamlMap services(String path) =>
      (loadYaml(File(path).readAsStringSync()) as YamlMap)['services']
          as YamlMap;
  String read(String path) => File(path).readAsStringSync();

  group('its server', () {
    final server =
        services('deploy/compose.meditate.yaml')['meditate-server'] as YamlMap;
    final environment = server['environment'] as YamlMap;

    test('signs in through the register, with the instance secret', () {
      expect(environment['ACCOUNT_REGISTER_URL'], 'http://server:8082/');
      expect(
        environment['SERVERPOD_PASSWORD_instanceSecret'],
        r'${INSTANCE_SECRET:?set INSTANCE_SECRET in deploy/.env}',
      );
    });

    test('has a database password and pepper of its own', () {
      expect(
        environment['SERVERPOD_DATABASE_PASSWORD'],
        startsWith(r'${MEDITATE_POSTGRES_PASSWORD:?'),
      );
      expect(
        environment['SERVERPOD_PASSWORD_serverSideSessionKeyHashPepper'],
        startsWith(r'${MEDITATE_SESSION_KEY_HASH_PEPPER:?'),
      );
    });

    test('names its own domain as its public address', () {
      for (final variable in [
        'SERVERPOD_API_SERVER_PUBLIC_HOST',
        'SERVERPOD_WEB_SERVER_PUBLIC_HOST',
      ]) {
        expect(environment[variable], startsWith(r'${MEDITATE_DOMAIN:?'));
      }
    });

    test('has no library unless its own file mounts one', () {
      expect(environment.keys, isNot(contains('MEDITATE_LIBRARY_DIR')));
      expect(server['volumes'], isNull);
    });

    test("is told to Learn's register as a member", () {
      final learn =
          services('deploy/compose.meditate.yaml')['server'] as YamlMap;
      expect(
        (learn['environment'] as YamlMap)['INSTANCE_MEMBER_MEDITATE'],
        'http://meditate-server:8082/',
      );
    });

    test('connects to its own database as its own role', () {
      final config = loadYaml(
        read('apps/meditate/halkyon_meditate_server/config/production.yaml'),
      ) as YamlMap;
      final database = config['database'] as YamlMap;
      expect(database['name'], 'halkyon_meditate');
      expect(database['user'], 'halkyon_meditate');
      expect(database['host'], 'postgres');
      expect((config['sessionLogs'] as YamlMap)['persistentEnabled'], isFalse);
      expect(config.keys, isNot(contains('insightsServer')));
    });
  });

  group("the operator's library (D16)", () {
    final server =
        services('deploy/compose.meditate-library.yaml')['meditate-server']
            as YamlMap;

    test('is mounted read-only where the server reads it', () {
      expect(server['volumes'], [
        r'${MEDITATE_LIBRARY:?set MEDITATE_LIBRARY in deploy/.env}:/library:ro',
      ]);
      expect(
        (server['environment'] as YamlMap)['MEDITATE_LIBRARY_DIR'],
        '/library',
      );
    });

    test('is checked by a program in the image', () {
      final dockerfile = read(
        'apps/meditate/halkyon_meditate_server/Dockerfile',
      );
      expect(dockerfile, contains('--target bin/check_library.dart'));
      expect(dockerfile, contains('bin/check_library'));
    });
  });

  group('its site', () {
    // The site's directives, without its comments.
    final site = read('deploy/sidecars/meditate.caddy')
        .split('\n')
        .where((line) => !line.trim().startsWith('#'))
        .join('\n');

    test("sends the library's files to the web server, everything else to "
        'the API server', () {
      expect(site, contains('handle /library/* {'));
      expect(site, contains('reverse_proxy meditate-server:8082'));
      expect(site, contains('reverse_proxy meditate-server:8080'));
    });

    test("never passes on the calls between the instance's services", () {
      expect(site, isNot(contains('/halkyon-base')));
      expect(
        RegExp('reverse_proxy meditate-server:8082').allMatches(site),
        hasLength(1),
      );
    });

    test('is mounted into Caddy by the compose file', () {
      final caddy =
          services('deploy/compose.meditate.yaml')['caddy'] as YamlMap;
      expect(
        caddy['volumes'],
        contains(
          './sidecars/meditate.caddy:/etc/caddy/sidecars/meditate.caddy:ro',
        ),
      );
    });
  });

  group('the deploy and the backups', () {
    test('build, dump, migrate and wait for it as for Todo', () {
      expect(
        read('deploy/redeploy.sh'),
        contains('for app in train todo meditate; do'),
      );
    });

    test('back its database up beside the others', () {
      expect(
        read('deploy/backup.sh'),
        contains('for app in train todo meditate; do'),
      );
    });

    test("have tool/check.dart replay its image's resolution", () {
      expect(
        dartImages,
        contains('apps/meditate/halkyon_meditate_server/Dockerfile'),
      );
    });
  });

  group("every app's server names the instance's domain, not halkyon.eu's", () {
    for (final (file, service, variable) in [
      ('compose.learn.yaml', 'server', 'LEARN_PUBLIC_HOST'),
      ('compose.train.yaml', 'train-server', 'TRAIN_DOMAIN'),
      ('compose.todo.yaml', 'todo-server', 'TODO_DOMAIN'),
      ('compose.meditate.yaml', 'meditate-server', 'MEDITATE_DOMAIN'),
    ]) {
      test(service, () {
        final environment =
            (services('deploy/$file')[service] as YamlMap)['environment']
                as YamlMap;
        for (final key in [
          'SERVERPOD_API_SERVER_PUBLIC_HOST',
          'SERVERPOD_WEB_SERVER_PUBLIC_HOST',
        ]) {
          expect(environment[key], startsWith('\${$variable'));
        }
      });
    }
  });
}