import 'package:flutter/material.dart';
import 'package:hooks_riverpod/hooks_riverpod.dart';
import 'package:immich_mobile/modules/album/services/album.service.dart';
import 'package:immich_mobile/shared/models/exif_info.dart';
import 'package:immich_mobile/shared/models/store.dart';
import 'package:immich_mobile/shared/models/user.dart';
import 'package:immich_mobile/shared/providers/db.provider.dart';
import 'package:immich_mobile/shared/services/asset.service.dart';
import 'package:immich_mobile/modules/home/ui/asset_grid/asset_grid_data_structure.dart';
import 'package:immich_mobile/modules/settings/providers/app_settings.provider.dart';
import 'package:immich_mobile/modules/settings/services/app_settings.service.dart';
import 'package:immich_mobile/shared/models/asset.dart';
import 'package:immich_mobile/shared/services/sync.service.dart';
import 'package:immich_mobile/shared/services/user.service.dart';
import 'package:immich_mobile/utils/db.dart';
import 'package:isar/isar.dart';
import 'package:logging/logging.dart';
import 'package:photo_manager/photo_manager.dart';

class AssetNotifier extends StateNotifier<bool> {
  final AssetService _assetService;
  final AlbumService _albumService;
  final UserService _userService;
  final SyncService _syncService;
  final Isar _db;
  final log = Logger('AssetNotifier');
  bool _getAllAssetInProgress = false;
  bool _deleteInProgress = false;
  bool _getPartnerAssetsInProgress = false;

  AssetNotifier(
    this._assetService,
    this._albumService,
    this._userService,
    this._syncService,
    this._db,
  ) : super(false);

  Future<void> getAllAsset({bool clear = false}) async {
    if (_getAllAssetInProgress || _deleteInProgress) {
      // guard against multiple calls to this method while it's still working
      return;
    }
    final stopwatch = Stopwatch()..start();
    try {
      _getAllAssetInProgress = true;
      state = true;
      if (clear) {
        await clearAssetsAndAlbums(_db);
        log.info("Manual refresh requested, cleared assets and albums from db");
      }
      final bool newRemote = await _assetService.refreshRemoteAssets();
      final bool newLocal = await _albumService.refreshDeviceAlbums();
      debugPrint("newRemote: $newRemote, newLocal: $newLocal");

      log.info("Load assets: ${stopwatch.elapsedMilliseconds}ms");
    } finally {
      _getAllAssetInProgress = false;
      state = false;
    }
  }

  Future<void> getPartnerAssets([User? partner]) async {
    if (_getPartnerAssetsInProgress) return;
    try {
      final stopwatch = Stopwatch()..start();
      _getPartnerAssetsInProgress = true;
      if (partner == null) {
        await _userService.refreshUsers();
        final List<User> partners =
            await _db.users.filter().isPartnerSharedWithEqualTo(true).findAll();
        for (User u in partners) {
          await _assetService.refreshRemoteAssets(u);
        }
      } else {
        await _assetService.refreshRemoteAssets(partner);
      }
      log.info("Load partner assets: ${stopwatch.elapsedMilliseconds}ms");
    } finally {
      _getPartnerAssetsInProgress = false;
    }
  }

  Future<void> clearAllAsset() {
    return clearAssetsAndAlbums(_db);
  }

  Future<void> onNewAssetUploaded(Asset newAsset) async {
    // eTag on device is not valid after partially modifying the assets
    Store.delete(StoreKey.assetETag);
    await _syncService.syncNewAssetToDb(newAsset);
  }

  Future<bool> deleteAssets(
    Iterable<Asset> deleteAssets, {
    bool? force = false,
  }) async {
    _deleteInProgress = true;
    state = true;
    try {
      final localDeleted = await _deleteLocalAssets(deleteAssets);
      final remoteDeleted = await _deleteRemoteAssets(deleteAssets, force);
      if (localDeleted.isNotEmpty || remoteDeleted.isNotEmpty) {
        List<Asset>? assetsToUpdate;
        // Local only assets are permanently deleted for now. So always remove them from db
        final dbIds = deleteAssets
            .where((a) => a.isLocal && !a.isRemote)
            .map((e) => e.id)
            .toList();
        if (force == null || !force) {
          assetsToUpdate = remoteDeleted.map((e) {
            e.isTrashed = true;
            return e;
          }).toList();
        } else {
          // Add all remote assets to be deleted from isar as since they are permanently deleted
          dbIds.addAll(remoteDeleted.map((e) => e.id));
        }
        await _db.writeTxn(() async {
          if (assetsToUpdate != null) {
            await _db.assets.putAll(assetsToUpdate);
          }
          await _db.exifInfos.deleteAll(dbIds);
          await _db.assets.deleteAll(dbIds);
        });
        return true;
      }
    } finally {
      _deleteInProgress = false;
      state = false;
    }
    return false;
  }

  Future<List<String>> _deleteLocalAssets(
    Iterable<Asset> assetsToDelete,
  ) async {
    final List<String> local =
        assetsToDelete.where((a) => a.isLocal).map((a) => a.localId!).toList();
    // Delete asset from device
    if (local.isNotEmpty) {
      try {
        return await PhotoManager.editor.deleteWithIds(local);
      } catch (e, stack) {
        log.severe("Failed to delete asset from device", e, stack);
      }
    }
    return [];
  }

  Future<Iterable<Asset>> _deleteRemoteAssets(
    Iterable<Asset> assetsToDelete,
    bool? force,
  ) async {
    final Iterable<Asset> remote = assetsToDelete.where((e) => e.isRemote);

    final isSuccess = await _assetService.deleteAssets(remote, force: force);
    return isSuccess ? remote : [];
  }

  Future<void> toggleFavorite(List<Asset> assets, bool status) async {
    final newAssets = await _assetService.changeFavoriteStatus(assets, status);
    for (Asset? newAsset in newAssets) {
      if (newAsset == null) {
        log.severe("Change favorite status failed for asset");
        continue;
      }
    }
  }

  Future<void> toggleArchive(List<Asset> assets, bool status) async {
    final newAssets = await _assetService.changeArchiveStatus(assets, status);
    int i = 0;
    for (Asset oldAsset in assets) {
      final newAsset = newAssets[i++];
      if (newAsset == null) {
        log.severe("Change archive status failed for asset ${oldAsset.id}");
        continue;
      }
    }
  }
}

final assetProvider = StateNotifierProvider<AssetNotifier, bool>((ref) {
  return AssetNotifier(
    ref.watch(assetServiceProvider),
    ref.watch(albumServiceProvider),
    ref.watch(userServiceProvider),
    ref.watch(syncServiceProvider),
    ref.watch(dbProvider),
  );
});

final assetDetailProvider =
    StreamProvider.autoDispose.family<Asset, Asset>((ref, asset) async* {
  yield await ref.watch(assetServiceProvider).loadExif(asset);
  final db = ref.watch(dbProvider);
  await for (final a in db.assets.watchObject(asset.id)) {
    if (a != null) yield await ref.watch(assetServiceProvider).loadExif(a);
  }
});

final assetWatcher =
    StreamProvider.autoDispose.family<Asset?, Asset>((ref, asset) {
  final db = ref.watch(dbProvider);
  return db.assets.watchObject(asset.id, fireImmediately: true);
});

final assetsProvider =
    StreamProvider.family<RenderList, int?>((ref, userId) async* {
  if (userId == null) return;
  final query = ref
      .watch(dbProvider)
      .assets
      .where()
      .ownerIdEqualToAnyChecksum(userId)
      .filter()
      .isArchivedEqualTo(false)
      .isTrashedEqualTo(false)
      .sortByFileCreatedAtDesc();
  final settings = ref.watch(appSettingsServiceProvider);
  final groupBy =
      GroupAssetsBy.values[settings.getSetting(AppSettingsEnum.groupAssetsBy)];
  yield await RenderList.fromQuery(query, groupBy);
  await for (final _ in query.watchLazy()) {
    yield await RenderList.fromQuery(query, groupBy);
  }
});

final remoteAssetsProvider =
    StreamProvider.family<RenderList, int?>((ref, userId) async* {
  if (userId == null) return;
  final query = ref
      .watch(dbProvider)
      .assets
      .where()
      .remoteIdIsNotNull()
      .filter()
      .ownerIdEqualTo(userId)
      .isTrashedEqualTo(false)
      .sortByFileCreatedAtDesc();
  final settings = ref.watch(appSettingsServiceProvider);
  final groupBy =
      GroupAssetsBy.values[settings.getSetting(AppSettingsEnum.groupAssetsBy)];
  yield await RenderList.fromQuery(query, groupBy);
  await for (final _ in query.watchLazy()) {
    yield await RenderList.fromQuery(query, groupBy);
  }
});