import 'package:drift/drift.dart';
import 'package:tallee/data/db/database.dart';
import 'package:tallee/data/db/tables/team_table.dart';
import 'package:tallee/data/dto/player.dart';
import 'package:tallee/data/dto/team.dart';

part 'team_dao.g.dart';

@DriftAccessor(tables: [TeamTable])
class TeamDao extends DatabaseAccessor<AppDatabase> with _$TeamDaoMixin {
  TeamDao(super.db);

  /// Retrieves all teams from the database.
  /// Note: This returns teams without their members. Use getTeamById for full team data.
  Future<List<Team>> getAllTeams() async {
    final query = select(teamTable);
    final result = await query.get();
    return Future.wait(
      result.map((row) async {
        final members = await _getTeamMembers(teamId: row.id);
        return Team(
          id: row.id,
          name: row.name,
          createdAt: row.createdAt,
          members: members,
        );
      }),
    );
  }

  /// Retrieves a [Team] by its [teamId], including its members.
  Future<Team> getTeamById({required String teamId}) async {
    final query = select(teamTable)..where((t) => t.id.equals(teamId));
    final result = await query.getSingle();
    final members = await _getTeamMembers(teamId: teamId);
    return Team(
      id: result.id,
      name: result.name,
      createdAt: result.createdAt,
      members: members,
    );
  }

  /// Helper method to get team members from player_match_table.
  /// This assumes team members are tracked via the player_match_table.
  Future<List<Player>> _getTeamMembers({required String teamId}) async {
    // Get all player_match entries with this teamId
    final playerMatchQuery = select(db.playerMatchTable)
      ..where((pm) => pm.teamId.equals(teamId));
    final playerMatches = await playerMatchQuery.get();

    if (playerMatches.isEmpty) return [];

    // Get unique player IDs
    final playerIds = playerMatches.map((pm) => pm.playerId).toSet();

    // Fetch all players
    final players = await Future.wait(
      playerIds.map((id) => db.playerDao.getPlayerById(playerId: id)),
    );
    return players;
  }

  /// Adds a new [team] to the database.
  /// Returns `true` if the team was added, `false` otherwise.
  Future<bool> addTeam({required Team team}) async {
    if (!await teamExists(teamId: team.id)) {
      await into(teamTable).insert(
        TeamTableCompanion.insert(
          id: team.id,
          name: team.name,
          createdAt: team.createdAt,
        ),
        mode: InsertMode.insertOrReplace,
      );
      return true;
    }
    return false;
  }

  /// Adds multiple [teams] to the database in a batch operation.
  Future<bool> addTeamsAsList({required List<Team> teams}) async {
    if (teams.isEmpty) return false;

    await db.batch(
      (b) => b.insertAll(
        teamTable,
        teams
            .map(
              (team) => TeamTableCompanion.insert(
                id: team.id,
                name: team.name,
                createdAt: team.createdAt,
              ),
            )
            .toList(),
        mode: InsertMode.insertOrIgnore,
      ),
    );

    return true;
  }

  /// Deletes the team with the given [teamId] from the database.
  /// Returns `true` if the team was deleted, `false` otherwise.
  Future<bool> deleteTeam({required String teamId}) async {
    final query = delete(teamTable)..where((t) => t.id.equals(teamId));
    final rowsAffected = await query.go();
    return rowsAffected > 0;
  }

  /// Checks if a team with the given [teamId] exists in the database.
  /// Returns `true` if the team exists, `false` otherwise.
  Future<bool> teamExists({required String teamId}) async {
    final query = select(teamTable)..where((t) => t.id.equals(teamId));
    final result = await query.getSingleOrNull();
    return result != null;
  }

  /// Updates the name of the team with the given [teamId].
  Future<void> updateTeamName({
    required String teamId,
    required String newName,
  }) async {
    await (update(teamTable)..where((t) => t.id.equals(teamId))).write(
      TeamTableCompanion(name: Value(newName)),
    );
  }

  /// Retrieves the total count of teams in the database.
  Future<int> getTeamCount() async {
    final count =
        await (selectOnly(teamTable)..addColumns([teamTable.id.count()]))
            .map((row) => row.read(teamTable.id.count()))
            .getSingle();
    return count ?? 0;
  }

  /// Deletes all teams from the database.
  /// Returns `true` if more than 0 rows were affected, otherwise `false`.
  Future<bool> deleteAllTeams() async {
    final query = delete(teamTable);
    final rowsAffected = await query.go();
    return rowsAffected > 0;
  }
}