import 'dart:async';
import 'dart:developer';
import 'dart:io';
import 'dart:typed_data';

import 'package:injectable/injectable.dart';
import 'package:mnemo_cards_backend/database/database.dart';
import 'package:mnemo_cards_common_backend/mnemo_cards_common_backend.dart' hide VoiceModel;
import 'package:mnemo_cards_common/mnemo_cards_common.dart';
import 'pack_dto_converter.dart';
import 'pack_manager_extensions.dart';
import 'card_pack_drift_extension.dart';

@lazySingleton
class PackManager {
  final AppDatabase _db;
  final PackDtoConverter packDtoConverter;

  PackManager(this._db, this.packDtoConverter);

  Future<List<CardPackPreviewDto>> listPacksPreviews(
    UserModel? userModel,
    Map<String, String>? params,
  ) async {
    // Get packs from Drift database
    final packs = await _db.packDao.getAllPacks(
      enabledOnly: true,
      orderByField: 'order',
    );

    return (await Future.wait(packs.map(
      (pack) async {
        final dto = await pack.toPreviewDto(userModel);
        if (!pack.enabled) {
          return dto.copyWith(subtitle: 'DISABLED ${dto.subtitle}');
        }
        return dto;
      },
    )))
        .toList();
  }

  Future<CardPack?> getPack(int id) async {
    return await _db.packDao.getPackById(id);
  }

  Future<List<GameCard>> getCards(int packId) async {
    return await _db.packDao.getPackCards(packId);
  }

  Future<GameCard?> getCard(int id) async {
    return await _db.packDao.getCardById(id);
  }

  Future<VoiceModel?> getVoice(int id) async {
    return await _db.packDao.getVoiceById(id);
  }

  Future<List<VoiceModel>> getVoices(int cardId) async {
    return await _db.packDao.getCardVoices(cardId);
  }

  Future<CardPackDto> getPackDto(int id, UserModel? userModel) async {
    final pack = await getPack(id);
    if (pack == null) {
      throw StateError('Pack not found');
    }

    final cards = await getCards(id);
    final voices = <VoiceModel>[];

    for (final card in cards) {
      voices.addAll(await getVoices(card.id));
    }

    return await pack.toDto(cards, voices, userModel);
  }

  Future<List<String>> getPackPreviewImages(int packId) async {
    final pack = await getPack(packId);
    if (pack == null) {
      throw StateError('Pack not found');
    }

    final previewCards = await _db.packDao.getPreviewCards(packId);
    final cards = previewCards.isNotEmpty ? previewCards : (await getCards(packId)).take(6).toList();

    final images = <String>[];
    for (final card in previewCards) {
      if (card.image.isNotEmpty) {
        try {
          final image = await card.image.base64Image;
          images.add(image);
        } catch (e, s) {
          log('error while reading image', error: e, stackTrace: s);
        }
      }
    }

    // If we don't have enough preview images, fill with empty strings
    while (images.length < 6) {
      images.add('');
    }

    return images;
  }

  Future<Map<String, Uint8List>> getPackImages(int packId) async {
    final cards = await getCards(packId);
    final result = <String, Uint8List>{};

    for (final card in cards) {
      if (card.image.isNotEmpty) {
        try {
          result[card.id.toString()] =
              File('${PackManagerUtils.assetsDirectory.path}/cards/${card.image}')
                  .readAsBytesSync();
        } catch (e, s) {
          log('error while reading image', error: e, stackTrace: s);
        }
      }
    }

    return result;
  }
}

// Static utility functions for PackManager
class PackManagerUtils {
  static Directory get assetsDirectory {
    String mainPath = Platform.resolvedExecutable;
    if ((Platform.isMacOS || Platform.isLinux) &&
        !Platform.script.toString().contains('StudioProjects')) {
      mainPath = mainPath.substring(0, mainPath.lastIndexOf("/"));
      var dir = Directory("$mainPath/../data");
      if (dir.existsSync()) {
        return dir;
      }
      dir = Directory("$mainPath/data");
      if (dir.existsSync()) {
        return dir;
      }
      throw Exception('No asset dir! $mainPath');
    }

    if (Platform.isMacOS) {
      mainPath = mainPath.substring(0, mainPath.lastIndexOf("/"));
      return Directory(
          '/Users/dmitry/StudioProjects/mnemo_cards/mnemo_cards_backend/data');
    } else if (Platform.isWindows) {
      mainPath = mainPath.substring(0, mainPath.lastIndexOf("\\"));
      return Directory("$mainPath/data/flutter_assets/data");
    } else {
      return Directory('');
    }
  }
}