import 'package:drift/drift.dart';
import 'package:game_tracker/data/db/database.dart';
import 'package:game_tracker/data/db/tables/player_group_table.dart';
import 'package:game_tracker/data/db/tables/player_table.dart';
import 'package:game_tracker/data/dto/player.dart';

part 'player_group_dao.g.dart';

@DriftAccessor(tables: [PlayerGroupTable, PlayerTable])
class PlayerGroupDao extends DatabaseAccessor<AppDatabase>
    with _$PlayerGroupDaoMixin {
  PlayerGroupDao(super.db);

  /// No need for a groupHasPlayers method since the members attribute is
  /// not nullable

  /// Adds a [player] to a group with the given [groupId].
  /// If the player is already in the group, no action is taken.
  /// If the player does not exist in the player table, they are added.
  /// Returns `true` if the player was added, otherwise `false`.
  Future<bool> addPlayerToGroup({
    required Player player,
    required String groupId,
  }) async {
    if (await isPlayerInGroup(playerId: player.id, groupId: groupId)) {
      return false;
    }

    if (!await db.playerDao.playerExists(playerId: player.id)) {
      db.playerDao.addPlayer(player: player);
    }

    await into(playerGroupTable).insert(
      PlayerGroupTableCompanion.insert(playerId: player.id, groupId: groupId),
    );

    return true;
  }

  /// Retrieves all players belonging to a specific group by [groupId].
  Future<List<Player>> getPlayersOfGroup({required String groupId}) async {
    final query = select(playerGroupTable)
      ..where((pG) => pG.groupId.equals(groupId));
    final result = await query.get();

    List<Player> groupMembers = List.empty(growable: true);

    for (var entry in result) {
      final player = await db.playerDao.getPlayerById(playerId: entry.playerId);
      groupMembers.add(player);
    }

    return groupMembers;
  }

  /// Removes a player from a group based on [playerId] and [groupId].
  /// Returns `true` if more than 0 rows were affected, otherwise `false`.
  Future<bool> removePlayerFromGroup({
    required String playerId,
    required String groupId,
  }) async {
    final query = delete(playerGroupTable)
      ..where((p) => p.playerId.equals(playerId) & p.groupId.equals(groupId));
    final rowsAffected = await query.go();
    return rowsAffected > 0;
  }

  /// Checks if a player with [playerId] is in the group with [groupId].
  /// Returns `true` if the player is in the group, otherwise `false`.
  Future<bool> isPlayerInGroup({
    required String playerId,
    required String groupId,
  }) async {
    final query = select(playerGroupTable)
      ..where((p) => p.playerId.equals(playerId) & p.groupId.equals(groupId));
    final result = await query.getSingleOrNull();
    return result != null;
  }
}