import 'package:drift/drift.dart';
import 'package:game_tracker/data/db/database.dart';
import 'package:game_tracker/data/db/tables/game_table.dart';
import 'package:game_tracker/data/db/tables/group_table.dart';
import 'package:game_tracker/data/db/tables/match_table.dart';
import 'package:game_tracker/data/db/tables/player_match_table.dart';
import 'package:game_tracker/data/dto/game.dart';
import 'package:game_tracker/data/dto/group.dart';
import 'package:game_tracker/data/dto/match.dart';
import 'package:game_tracker/data/dto/player.dart';

part 'match_dao.g.dart';

@DriftAccessor(tables: [MatchTable, GameTable, GroupTable, PlayerMatchTable])
class MatchDao extends DatabaseAccessor<AppDatabase> with _$MatchDaoMixin {
  MatchDao(super.db);

  /// Retrieves all matches from the database.
  Future<List<Match>> getAllMatches() async {
    final query = select(matchTable);
    final result = await query.get();

    return Future.wait(
      result.map((row) async {
        final game = await db.gameDao.getGameById(gameId: row.gameId);
        Group? group;
        if (row.groupId != null) {
          group = await db.groupDao.getGroupById(groupId: row.groupId!);
        }
        final players = await db.playerMatchDao.getPlayersOfMatch(
          matchId: row.id,
        );
        return Match(
          id: row.id,
          name: row.name ?? '',
          game: game,
          group: group,
          players: players,
          notes: row.notes,
          createdAt: row.createdAt,
        );
      }),
    );
  }

  /// Retrieves a [Match] by its [matchId].
  Future<Match> getMatchById({required String matchId}) async {
    final query = select(matchTable)..where((g) => g.id.equals(matchId));
    final result = await query.getSingle();

    final game = await db.gameDao.getGameById(gameId: result.gameId);

    Group? group;
    if (result.groupId != null) {
      group = await db.groupDao.getGroupById(groupId: result.groupId!);
    }

    List<Player>? players;
    if (await db.playerMatchDao.matchHasPlayers(matchId: matchId)) {
      players = await db.playerMatchDao.getPlayersOfMatch(matchId: matchId);
    }

    return Match(
      id: result.id,
      name: result.name ?? '',
      game: game,
      group: group,
      players: players,
      notes: result.notes,
      createdAt: result.createdAt,
    );
  }

  /// Adds a new [Match] to the database. Also adds players associations.
  /// This method assumes that the game and group (if any) are already present
  /// in the database.
  Future<void> addMatch({required Match match}) async {
    if (match.game == null) {
      throw ArgumentError('Match must have a game associated with it');
    }

    await db.transaction(() async {
      await into(matchTable).insert(
        MatchTableCompanion.insert(
          id: match.id,
          gameId: match.game!.id,
          groupId: Value(match.group?.id),
          name: Value(match.name),
          notes: Value(match.notes),
          createdAt: match.createdAt,
        ),
        mode: InsertMode.insertOrReplace,
      );

      if (match.players != null) {
        for (final p in match.players!) {
          await db.playerMatchDao.addPlayerToMatch(
            matchId: match.id,
            playerId: p.id,
          );
        }
      }
    });
  }

  /// Adds multiple [Match]es to the database in a batch operation.
  /// Also adds associated players and groups if they exist.
  /// If the [matches] list is empty, the method returns immediately.
  /// This method should only be used to import matches from a different device.
  Future<void> addMatchAsList({required List<Match> matches}) async {
    if (matches.isEmpty) return;
    await db.transaction(() async {
      // Add all games first (deduplicated)
      final uniqueGames = <String, Game>{};
      for (final match in matches) {
        if (match.game != null) {
          uniqueGames[match.game!.id] = match.game!;
        }
      }

      if (uniqueGames.isNotEmpty) {
        await db.batch(
          (b) => b.insertAll(
            db.gameTable,
            uniqueGames.values
                .map(
                  (game) => GameTableCompanion.insert(
                    id: game.id,
                    name: game.name,
                    ruleset: game.ruleset ?? '',
                    description: Value(game.description),
                    color: Value(game.color?.toString()),
                    icon: Value(game.icon),
                    createdAt: game.createdAt,
                  ),
                )
                .toList(),
            mode: InsertMode.insertOrIgnore,
          ),
        );
      }

      // Add all groups of the matches in batch
      await db.batch(
        (b) => b.insertAll(
          db.groupTable,
          matches
              .where((match) => match.group != null)
              .map(
                (match) => GroupTableCompanion.insert(
                  id: match.group!.id,
                  name: match.group!.name,
                  description: Value(match.group!.description),
                  createdAt: match.group!.createdAt,
                ),
              )
              .toList(),
          mode: InsertMode.insertOrIgnore,
        ),
      );

      // Add all matches in batch
      await db.batch(
        (b) => b.insertAll(
          matchTable,
          matches
              .where((match) => match.game != null)
              .map(
                (match) => MatchTableCompanion.insert(
                  id: match.id,
                  gameId: match.game!.id,
                  groupId: Value(match.group?.id),
                  name: Value(match.name),
                  notes: Value(match.notes),
                  createdAt: match.createdAt,
                ),
              )
              .toList(),
          mode: InsertMode.insertOrReplace,
        ),
      );

      // Add all players of the matches in batch (unique)
      final uniquePlayers = <String, Player>{};
      for (final match in matches) {
        if (match.players != null) {
          for (final p in match.players!) {
            uniquePlayers[p.id] = p;
          }
        }
        // Also include members of groups
        if (match.group != null) {
          for (final m in match.group!.members) {
            uniquePlayers[m.id] = m;
          }
        }
      }

      if (uniquePlayers.isNotEmpty) {
        await db.batch(
          (b) => b.insertAll(
            db.playerTable,
            uniquePlayers.values
                .map(
                  (p) => PlayerTableCompanion.insert(
                    id: p.id,
                    name: p.name,
                    description: Value(p.description),
                    createdAt: p.createdAt,
                  ),
                )
                .toList(),
            mode: InsertMode.insertOrIgnore,
          ),
        );
      }

      // Add all player-match associations in batch
      await db.batch((b) {
        for (final match in matches) {
          if (match.players != null) {
            for (final p in match.players!) {
              b.insert(
                db.playerMatchTable,
                PlayerMatchTableCompanion.insert(
                  matchId: match.id,
                  playerId: p.id,
                  score: 0,
                ),
                mode: InsertMode.insertOrIgnore,
              );
            }
          }
        }
      });

      // Add all player-group associations in batch
      await db.batch((b) {
        for (final match in matches) {
          if (match.group != null) {
            for (final m in match.group!.members) {
              b.insert(
                db.playerGroupTable,
                PlayerGroupTableCompanion.insert(
                  playerId: m.id,
                  groupId: match.group!.id,
                ),
                mode: InsertMode.insertOrIgnore,
              );
            }
          }
        }
      });
    });
  }

  /// Deletes the match with the given [matchId] from the database.
  /// Returns `true` if more than 0 rows were affected, otherwise `false`.
  Future<bool> deleteMatch({required String matchId}) async {
    final query = delete(matchTable)..where((g) => g.id.equals(matchId));
    final rowsAffected = await query.go();
    return rowsAffected > 0;
  }

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

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

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

  /// Updates the notes of the match with the given [matchId].
  /// Returns `true` if more than 0 rows were affected, otherwise `false`.
  Future<bool> updateMatchNotes({
    required String matchId,
    required String? notes,
  }) async {
    final query = update(matchTable)..where((g) => g.id.equals(matchId));
    final rowsAffected = await query.write(
      MatchTableCompanion(notes: Value(notes)),
    );
    return rowsAffected > 0;
  }

  /// Changes the name of the match with the given [matchId] to [newName].
  /// Returns `true` if more than 0 rows were affected, otherwise `false`.
  Future<bool> updateMatchName({
    required String matchId,
    required String newName,
  }) async {
    final query = update(matchTable)..where((g) => g.id.equals(matchId));
    final rowsAffected = await query.write(
      MatchTableCompanion(name: Value(newName)),
    );
    return rowsAffected > 0;
  }

  /// Updates the game of the match with the given [matchId].
  /// Returns `true` if more than 0 rows were affected, otherwise `false`.
  Future<bool> updateMatchGame({
    required String matchId,
    required String gameId,
  }) async {
    final query = update(matchTable)..where((g) => g.id.equals(matchId));
    final rowsAffected = await query.write(
      MatchTableCompanion(gameId: Value(gameId)),
    );
    return rowsAffected > 0;
  }

  /// Updates the group of the match with the given [matchId].
  /// Pass null to remove the group association.
  /// Returns `true` if more than 0 rows were affected, otherwise `false`.
  Future<bool> updateMatchGroup({
    required String matchId,
    required String? groupId,
  }) async {
    final query = update(matchTable)..where((g) => g.id.equals(matchId));
    final rowsAffected = await query.write(
      MatchTableCompanion(groupId: Value(groupId)),
    );
    return rowsAffected > 0;
  }

  // ============================================================
  // TEMPORARY: Winner methods - these are stubs and do not persist data
  // TODO: Implement proper winner handling
  // ============================================================

  /// TEMPORARY: Checks if a match has a winner.
  /// Currently returns true if the match has any players.
  Future<bool> hasWinner({required String matchId}) async {
    final players = await db.playerMatchDao.getPlayersOfMatch(matchId: matchId);
    return players?.isNotEmpty ?? false;
  }

  /// TEMPORARY: Gets the winner of a match.
  /// Currently returns the first player in the match's player list.
  Future<Player?> getWinner({required String matchId}) async {
    final players = await db.playerMatchDao.getPlayersOfMatch(matchId: matchId);
    return (players?.isNotEmpty ?? false) ? players!.first : null;
  }

  /// TEMPORARY: Sets the winner of a match.
  /// Currently does nothing - winner is not persisted.
  Future<bool> setWinner({
    required String matchId,
    required String winnerId,
  }) async {
    // TODO: Implement winner persistence
    return true;
  }

  /// TEMPORARY: Removes the winner of a match.
  /// Currently does nothing - winner is not persisted.
  Future<bool> removeWinner({required String matchId}) async {
    // TODO: Implement winner persistence
    return true;
  }
}