import 'dart:convert';

import 'package:dio/dio.dart';
import 'package:flutter_sodium/flutter_sodium.dart';
import 'package:logging/logging.dart';
import 'package:photos/core/event_bus.dart';
import 'package:photos/core/network.dart';
import 'package:photos/db/files_db.dart';
import 'package:photos/events/files_updated_event.dart';
import 'package:photos/models/file.dart';
import 'package:photos/core/configuration.dart';
import 'package:photos/models/file_magic_metadata.dart';
import 'package:photos/services/remote_sync_service.dart';

import 'crypto_util.dart';
import 'file_download_util.dart';

final _dio = Network.instance.getDio();
FilesDB _filesDB = FilesDB.instance;

Future<void> changeVisibility(List<File> files, int visibility) async {
  final params = <String, dynamic>{};
  params['metadataList'] = [];
  int ownerID = Configuration.instance.getUserID();

  for (final file in files) {
    if (file.uploadedFileID == null) {
      throw AssertionError("operation is only supported on backed up files");
    } else if (file.ownerID != ownerID) {
      throw AssertionError("can not modify memories not owned by you");
    }

    Map<String, dynamic> jsonToUpdate = jsonDecode(file.mMdEncodedJson);
    jsonToUpdate['visibility'] = visibility;

    // update the local information so that it's reflected on UI
    file.mMdEncodedJson = jsonEncode(jsonToUpdate);
    file.fileMagicMetadata = FileMagicMetadata.fromJson(jsonToUpdate);

    final fileKey = decryptFileKey(file);
    final encryptedMMd = await CryptoUtil.encryptChaCha(
        utf8.encode(jsonEncode(jsonToUpdate)), fileKey);
    params['metadataList'].add(UpdateMagicMetadata(
        id: file.uploadedFileID,
        data: MetadataPayload(
          version: file.mMdVersion,
          count: jsonToUpdate.length,
          data: Sodium.bin2base64(encryptedMMd.encryptedData),
          header: Sodium.bin2base64(encryptedMMd.header),
        )));
  }
  return _dio
      .post(
    Configuration.instance.getHttpEndpoint() + "/files/update-magic-metadata",
    data: params,
    options:
        Options(headers: {"X-Auth-Token": Configuration.instance.getToken()}),
  )
      .then((value) async {
    // update the state of the selected file. Same file in other collection
    // should be eventually synced after remote sync has completed
    await _filesDB.insertMultiple(files);
    Bus.instance.fire(FilesUpdatedEvent(files));
    RemoteSyncService.instance.sync(silently: true);
  });
}

class UpdateMagicMetadata {
  int id;
  MetadataPayload data;

  UpdateMagicMetadata({this.id, this.data});

  UpdateMagicMetadata.fromJson(dynamic json) {
    id = json['id'];
    data = json['data'] != null ? MetadataPayload.fromJson(json['data']) : null;
  }

  Map<String, dynamic> toJson() {
    var map = <String, dynamic>{};
    map['id'] = id;
    if (data != null) {
      map['data'] = data.toJson();
    }
    return map;
  }
}

class MetadataPayload {
  int version;
  int count;
  String data;
  String header;

  MetadataPayload({this.version, this.count, this.data, this.header});

  MetadataPayload.fromJson(dynamic json) {
    version = json['version'];
    count = json['count'];
    data = json['data'];
    header = json['header'];
  }

  Map<String, dynamic> toJson() {
    var map = <String, dynamic>{};
    map['version'] = version;
    map['count'] = count;
    map['data'] = data;
    map['header'] = header;
    return map;
  }
}