import 'package:flutter/rendering.dart';
import 'package:logging/logging.dart';
import 'package:nc_photos/account.dart';
import 'package:nc_photos/db/entity_converter.dart';
import 'package:nc_photos/debug_util.dart';
import 'package:nc_photos/di_container.dart';
import 'package:nc_photos/entity/file.dart';
import 'package:nc_photos/entity/file/data_source.dart';
import 'package:nc_photos/entity/file_descriptor.dart';
import 'package:nc_photos/progress_util.dart';
import 'package:nc_photos/remote_storage_util.dart' as remote_storage_util;
import 'package:nc_photos/use_case/ls_single_file.dart';
import 'package:np_codegen/np_codegen.dart';

part 'sync_dir.g.dart';

@npLog
class SyncDir {
  SyncDir(this._c) : assert(require(_c));

  static bool require(DiContainer c) =>
      DiContainer.has(c, DiType.fileRepoRemote) &&
      DiContainer.has(c, DiType.touchManager);

  /// Sync local SQLite DB with remote content
  ///
  /// Return true if some of the files have changed
  Future<bool> call(
    Account account,
    String dirPath, {
    bool isRecursive = true,
    ValueChanged<Progress>? onProgressUpdate,
  }) async {
    final dirCache = await _queryAllDirEtags(account, dirPath);
    final remoteRoot =
        await LsSingleFile(_c.withRemoteFileRepo())(account, dirPath);
    return await _syncDir(
      account,
      remoteRoot,
      dirCache,
      isRecursive: isRecursive,
      onProgressUpdate: onProgressUpdate,
    );
  }

  Future<bool> _syncDir(
    Account account,
    File remoteDir,
    Map<int, String> dirCache, {
    required bool isRecursive,
    ValueChanged<Progress>? onProgressUpdate,
  }) async {
    final status = await _checkContentUpdated(account, remoteDir, dirCache);
    if (!status.isUpdated) {
      _log.finer("[_syncDir] Dir unchanged: ${remoteDir.path}");
      return false;
    }
    _log.info("[_syncDir] Dir changed: ${remoteDir.path}");

    final dataSrc = FileCachedDataSource(_c, shouldCheckCache: true);
    final syncState = await dataSrc.beginSync(account, remoteDir,
        remoteTouchEtag: status.touchResult);
    final children = syncState.files;
    if (!isRecursive) {
      await dataSrc.concludeSync(syncState);
      return true;
    }
    final subDirs = children
        .where((f) =>
            f.isCollection == true &&
            !remoteDir.compareServerIdentity(f) &&
            !f.path.endsWith(remote_storage_util.getRemoteStorageDir(account)))
        .toList();
    final progress = IntProgress(subDirs.length);
    for (final d in subDirs) {
      onProgressUpdate
          ?.call(Progress(progress.progress, d.strippedPathWithEmpty));
      try {
        await _syncDir(
          account,
          d,
          dirCache,
          isRecursive: isRecursive,
          onProgressUpdate: (value) {
            final merged = progress.progress + progress.step * value.progress;
            onProgressUpdate?.call(Progress(merged, value.text));
          },
        );
      } catch (e, stackTrace) {
        _log.severe("[_syncDir] Failed while _syncDir: ${logFilename(d.path)}",
            e, stackTrace);
      }
      progress.next();
    }
    await dataSrc.concludeSync(syncState);
    return true;
  }

  Future<({bool isUpdated, String? touchResult})> _checkContentUpdated(
      Account account, File remoteDir, Map<int, String> dirCache) async {
    String? touchResult;
    try {
      touchResult = await _c.touchManager.checkTouchEtag(account, remoteDir);
      if (touchResult == null &&
          dirCache[remoteDir.fileId!] == remoteDir.etag!) {
        return const (isUpdated: false, touchResult: null);
      }
    } catch (e, stackTrace) {
      _log.severe("[_isContentUpdated] Uncaught exception", e, stackTrace);
    }
    return (isUpdated: true, touchResult: touchResult);
  }

  Future<Map<int, String>> _queryAllDirEtags(
      Account account, String dirPath) async {
    final dir = File(path: dirPath);
    return _c.npDb.getDirFileIdToEtagByLikeRelativePath(
      account: account.toDb(),
      relativePath: dir.strippedPathWithEmpty,
    );
  }

  final DiContainer _c;
}