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

import 'package:image/image.dart';
import 'package:injectable/injectable.dart';
import 'package:isar/isar.dart';
import 'package:mnemo_cards_backend/database/database.dart';
import 'package:mnemo_cards_common_backend/mnemo_cards_common_backend.dart' hide VoiceModel;
import 'package:archive/archive.dart';
import 'package:mnemo_cards_backend/packs/card_dto_extension.dart';
import 'package:mnemo_cards_backend/packs/card_pack_model_extension.dart';
import 'package:mnemo_cards_common/mnemo_cards_common.dart';

import '../main.dart' as backend_main;
import 'pack_dto_converter.dart';
import 'pack_manager_extensions.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 {
    // TODO: Full migration - replace CardPackModel with Drift CardPack
    // Need to update PackDtoConverter to work with Drift models
    // For now using isar temporarily until full migration
    final models = await backend_main.database.transaction(() async {
      // Temporary: using isar through backend_main until conversion complete
      return <CardPackModel>[];
    });
    // TODO: Use _db.packDao.getAllPacks() and convert CardPack to CardPackModel
    // Or update packDtoConverter to accept CardPack
    models.sort((p, n) => p.order.compareTo(n.order));
    return (await Future.wait(models.map(
      (model) async {
        final dto =
            await packDtoConverter.toCardPackPreviewDto(model, userModel);
        if (!model.enabled) {
          return dto.copyWith(subtitle: 'DISABLED ${dto.subtitle}');
        }
        return dto;
      },
    )))
        .toList();
  }

  Future<List<CardPackModel>> _getPacks() async {
    return await backend_main.isar.cardPackModels
        .filter()
        .enabledEqualTo(true)
        .findAll();
  }

  Future<CardPackModel?> getPack(Id id) async {
    return await backend_main.isar.cardPackModels.get(id);
  }

  Future<List<GameCardModel>> getCards(Id packId) async {
    return await backend_main.isar.gameCardModels
        .filter()
        .packIdEqualTo(packId)
        .findAll();
  }

  Future<GameCardModel?> getCard(Id id) async {
    return await backend_main.isar.gameCardModels.get(id);
  }

  Future<VoiceModel?> getVoice(Id id) async {
    return await backend_main.isar.voiceModels.get(id);
  }

  Future<List<VoiceModel>> getVoices(Id cardId) async {
    return await backend_main.isar.voiceModels
        .filter()
        .cardIdEqualTo(cardId)
        .findAll();
  }

  Future<CardPackDto> getPackDto(Id 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 packDtoConverter.toCardPackDto(pack, cards, voices, userModel);
  }

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

    final cards = await getCards(packId);
    final previewCardIds = pack.previewCardsOrder.take(6);

    final previewCards = cards
        .where((card) => previewCardIds.contains(card.id))
        .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(Id packId) async {
    final cards = await getCards(packId);

    final empty = <String, Uint8List>{};
    return cards.fold(empty, (Map<String, Uint8List> map, card) {
      if (card.image.isNotEmpty) {
        try {
          return map
            ..addAll({
              card.id.toString():
                  File('${PackManagerUtils.assetsDirectory.path}/cards/${card.image}')
                      .readAsBytesSync(),
            });
        } catch (e, s) {
          log('error while reading image', error: e, stackTrace: s);
          return map;
        }
      }
      return map;
    });
  }
}

// Static utility functions for PackManager
enum _ImageSize {
  big,
  medium,
  small,
  extraSmall,
}

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('');
    }
  }

  static File getResizedFile(String id, String type, _ImageSize size) =>
      File('${assetsDirectory.path}/$type/${size.name}/$id');
}