dmc/app/lib/services/database/app_database.dart

import 'dart:io';

import 'package:drift/drift.dart';
import 'package:drift/native.dart';
import 'package:path/path.dart' as p;
import 'package:path_provider/path_provider.dart';

part 'app_database.g.dart';

/// Persistenz fuer Missionen (Architektur-Doku 4.15): Drift statt Hive, weil
/// indexierte Abfragen (Suche nach Name/Ort/Datum) benoetigt werden und das
/// Schema kompatibel zu einem kuenftigen lokal-first Server-Sync-Muster
/// (Dirty-Flags, Server-IDs) bleiben soll.
class Missions extends Table {
  IntColumn get id => integer().autoIncrement()();
  TextColumn get name => text()();
  TextColumn get location => text().nullable()();
  DateTimeColumn get createdAt =>
      dateTime().withDefault(currentDateAndTime)();
  DateTimeColumn get updatedAt =>
      dateTime().withDefault(currentDateAndTime)();
  TextColumn get waypointsJson => text()();
  BoolColumn get isDirty => boolean().withDefault(const Constant(true))();
  TextColumn get serverId => text().nullable()();
}

/// Drohnen-Profile (Doku 3.5/7.3) - FC-Typ bewusst nicht Teil des Schemas,
/// siehe DroneProfile-Domainklasse.
class DroneProfiles extends Table {
  IntColumn get id => integer().autoIncrement()();
  TextColumn get name => text()();
  RealColumn get minSpeed => real()();
  RealColumn get cruiseSpeed => real()();
  RealColumn get maxSpeed => real()();
  RealColumn get minTurnRadius => real()();
  RealColumn get loiterRadius => real()();
  RealColumn get catchRadius => real()();
  RealColumn get maxClimbRate => real()();
  RealColumn get maxDescentRate => real()();
  RealColumn get maxRangeM => real()();
  RealColumn get maxEnduranceMin => real()();
  RealColumn get maxAltitudeM => real()();
}

/// Einzeilige Einstellungstabelle (id fest 0) fuer app-weite Auswahl, die
/// einen Neustart ueberleben soll: zuletzt aktives Drohnenprofil und die
/// zuletzt bearbeitete (autosaved) Mission, um sie beim naechsten Start
/// fortzusetzen (Doku 7.5: Autosave/Mission-Drafts).
class AppSettingsTable extends Table {
  IntColumn get id => integer()();
  IntColumn get activeDroneProfileId => integer().nullable()();
  IntColumn get currentMissionId => integer().nullable()();

  @override
  Set<Column> get primaryKey => {id};
}

@DriftDatabase(tables: [Missions, DroneProfiles, AppSettingsTable])
class AppDatabase extends _$AppDatabase {
  AppDatabase() : super(_openConnection());

  AppDatabase.forTesting(super.executor);

  @override
  int get schemaVersion => 2;

  @override
  MigrationStrategy get migration => MigrationStrategy(
        onCreate: (m) => m.createAll(),
        onUpgrade: (m, from, to) async {
          if (from < 2) {
            await m.addColumn(missions, missions.updatedAt);
            await m.createTable(droneProfiles);
            await m.createTable(appSettingsTable);
          }
        },
      );

  static LazyDatabase _openConnection() {
    return LazyDatabase(() async {
      final dbFolder = await getApplicationDocumentsDirectory();
      final file = File(p.join(dbFolder.path, 'dmc_missions.sqlite'));
      return NativeDatabase.createInBackground(file);
    });
  }
}