public async Task <CreateResult> Handle(GeoTaskCreateCommand command,
                                                CancellationToken cancellationToken)
        {
            if (command is null)
            {
                Logger.LogWarning(AppLogEvent.HandleArgumentError,
                                  "Handle create task got empty command");
                return(ErrorResult("Empty Geo Task Create command"));
            }

            var validator        = new GeoTaskCreateCommandValidator();
            var validationResult = await validator
                                   .ValidateAsync(command)
                                   .ConfigureAwait(false);

            if (!validationResult.IsValid)
            {
                Logger.LogWarning(AppLogEvent.RequestValidationError,
                                  "Validation command error. Command = {command}. " +
                                  "Error = {Error}", command.ToDictionary(),
                                  validationResult.Errors);
                return(ErrorResult
                           (validationResult.Errors.Select(x => x.ErrorMessage)));
            }

            try
            {
                var geoTask = new GeoTask()
                {
                    CreatedAt       = DateTime.UtcNow,
                    Description     = command.Description,
                    StatusChangedAt = DateTime.UtcNow,
                    IsArchived      = command.IsArchived,
                    PlanFinishAt    = command.PlanFinishAt,
                    PlanStartAt     = command.PlanStartAt,
                    Status          = GeoTaskStatus.New,
                    Title           = command.Title,
                };

                // Load from repository all mentioned actors
                var allActors = await GetActors(
                    command.AssistentActorsIds
                    .Concat(command.ObserverActorsIds)
                    .Append(command.ResponsibleActorId)
                    ).ConfigureAwait(false);

                // Add to the new entity only exist in the repository actors
                geoTask.AssistentActors.AddRange(
                    command.AssistentActorsIds
                    .Select(x => allActors
                            .FirstOrDefault(a => a.Id == x))
                    .Where(a => a != null));
                geoTask.ObserverActors.AddRange(
                    command.ObserverActorsIds
                    .Select(x => allActors
                            .FirstOrDefault(a => a.Id == x))
                    .Where(a => a != null));
                geoTask.ResponsibleActor = allActors
                                           .FirstOrDefault(a => a.Id == command.ResponsibleActorId);

                // Check that Geo Ids exist in repository
                geoTask.GeosIds.AddRange(await GetGeosIds(command.GeosIds)
                                         .ConfigureAwait(false));

                // Get Actor for current user by user name
                var creatorResponse = await Mediator
                                      .Send(new DbGetActorByNameRequest
                                            (command.CurrentPrincipal?.Identity?.Name))
                                      .ConfigureAwait(false);

                Actor createdBy = null;
                if (creatorResponse.Success)
                {
                    createdBy = creatorResponse.Entity;
                }

                geoTask.CreatedBy = createdBy;

                Project project = await GetProject(command.ProjectId)
                                  .ConfigureAwait(false);

                geoTask.ProjectId = project?.Id;

                var historyRec = new GeoTaskHistory
                {
                    ChangedAt = DateTime.UtcNow,
                    ChangedBy = createdBy,
                };
                historyRec.Operations.Add(new Operation
                {
                    OperationType = addOperation,
                    Path          = "/",
                    NewValue      = geoTask.ToDictionary()
                });
                geoTask.History.Add(historyRec);

                var validatorBeforeSave        = new GeoTaskBeforeSaveValidator();
                var validationBeforeSaveResult = await validatorBeforeSave
                                                 .ValidateAsync(geoTask)
                                                 .ConfigureAwait(false);

                if (!validationBeforeSaveResult.IsValid)
                {
                    Logger.LogWarning(AppLogEvent.RequestNotValid,
                                      "GeoTask validation error. Entity={Entity}. " +
                                      "Error={Error}.", geoTask.ToDictionary(),
                                      validationBeforeSaveResult.Errors);
                    return(ErrorResult(validationBeforeSaveResult.Errors
                                       .Select(x => x.ErrorMessage)));
                }

                var checkPermissionResult = await CheckPermission
                                                (geoTask, createdBy, project)
                                            .ConfigureAwait(false);

                if (!checkPermissionResult.Success)
                {
                    Logger.LogWarning(AppLogEvent.SecurityNotPassed,
                                      "GeoTask check create permission error. " +
                                      "Entity={Entity}. CurrentActor={CurrentActor}. " +
                                      "Project={Project}. Error={Error}.",
                                      geoTask.ToDictionary(), createdBy?.ToDictionary(),
                                      project?.ToDictionary(), checkPermissionResult.Errors);
                    return(checkPermissionResult);
                }

                return(await Mediator
                       .Send(new DbCreateCommand <GeoTask>(geoTask))
                       .ConfigureAwait(false));
            }
            catch (Exception e)
            {
                Logger.LogError(AppLogEvent.HandleErrorResponse, e,
                                "Call repository exception");
                return(ErrorResult("Not found"));
            }
        }
        public async Task <UpdateResult> Handle(GeoTaskUpdateCommand command,
                                                CancellationToken cancellationToken)
        {
            try
            {
                Logger.LogInformation(AppLogEvent.HandleRequest,
                                      "Handle update task {Command}", command.ToDictionary());

                if (command is null || string.IsNullOrWhiteSpace(command.Id))
                {
                    Logger.LogWarning(AppLogEvent.HandleArgumentError,
                                      "Handle update task command with empty request");
                    return(ErrorResult("Command empty argument"));
                }

                var validator        = new GeoTaskUpdateCommandValidator();
                var validationResult = await validator.ValidateAsync(command)
                                       .ConfigureAwait(false);

                if (!validationResult.IsValid)
                {
                    var validationErrors = validationResult.Errors
                                           .Select(x => x.ErrorMessage).ToList();
                    Logger.LogWarning(AppLogEvent.HandleArgumentError,
                                      "Task update command validation error. " +
                                      "Command={Command}. Error={Error}",
                                      command.ToDictionary(), validationErrors);
                    return(ErrorResult(validationErrors));
                }

                var oldGeoTaskResponse = await Mediator
                                         .Send(new DbGetEntityByIdRequest <GeoTask>(command.Id))
                                         .ConfigureAwait(false);

                if (!oldGeoTaskResponse.Success)
                {
                    Logger.LogWarning(AppLogEvent.HandleErrorResponse,
                                      "Get task for update error. Id={Id}. Error={Error}.",
                                      command.Id, oldGeoTaskResponse.Errors);
                    return(ErrorResult(oldGeoTaskResponse.Errors));
                }
                var oldGeoTask = oldGeoTaskResponse.Entity;

                var currentActorResponse = await Mediator
                                           .Send(new DbGetActorByNameRequest
                                                 (command.CurrentPrincipal?.Identity?.Name))
                                           .ConfigureAwait(false);

                var currentActor = currentActorResponse.Entity;

                OldProject = await GetProjectAsync(oldGeoTask.ProjectId)
                             .ConfigureAwait(false);

                // Check Project Id
                NewProject = null;
                if (command.ProjectId != OldProject?.Id)
                {
                    NewProject = await GetProjectAsync(command.ProjectId)
                                 .ConfigureAwait(false);
                }
                else
                {
                    NewProject = OldProject;
                }

                GeoTask newGeoTask = await BuildUpdatedGeoTask(command,
                                                               oldGeoTask, currentActor).ConfigureAwait(false);

                var validatorBeforeSave        = new GeoTaskBeforeSaveValidator();
                var validationBeforeSaveResult = await validatorBeforeSave
                                                 .ValidateAsync(newGeoTask)
                                                 .ConfigureAwait(false);

                if (!validationBeforeSaveResult.IsValid)
                {
                    Logger.LogWarning(AppLogEvent.RequestValidationError,
                                      "Update GeoTask validation error. " +
                                      "Entity={Entity}. Error={Error}.",
                                      newGeoTask.ToDictionary(),
                                      validationBeforeSaveResult.Errors);
                    return(ErrorResult(validationBeforeSaveResult.Errors
                                       .Select(x => x.ErrorMessage)));
                }

                ActorRole oldProjectRole = null;
                OldProject?.ProjectActorRoles?
                .TryGetValue(currentActor.Id, out oldProjectRole);
                ActorRole newProjectRole = null;
                if (oldGeoTask.ProjectId != newGeoTask.ProjectId)
                {
                    NewProject?.ProjectActorRoles?
                    .TryGetValue(currentActor.Id, out newProjectRole);
                }
                else
                {
                    newProjectRole = oldProjectRole;
                }

                var permissionValidateResult = await CheckPermissionAsync
                                                   (oldGeoTask, newGeoTask, currentActor,
                                                   oldProjectRole, newProjectRole)
                                               .ConfigureAwait(false);

                if (!permissionValidateResult.IsValid)
                {
                    Logger.LogWarning(AppLogEvent.SecurityNotPassed,
                                      "Current actor has no rights to update GeoTask. " +
                                      "Actor={Actor}. Entity before update={OldEntity}." +
                                      " Entity after update={NewEntity}. Error={Error}.",
                                      currentActor.ToDictionary(), oldGeoTask.ToDictionary(),
                                      newGeoTask.ToDictionary(),
                                      permissionValidateResult.Errors
                                      .Select(x => x.ErrorMessage));
                    return(ErrorResult(permissionValidateResult.Errors
                                       .Select(x => x.ErrorMessage)));
                }

                var updateResult = await Mediator
                                   .Send(new DbUpdateCommand <GeoTask>(newGeoTask))
                                   .ConfigureAwait(false);

                return(updateResult);
            }

            catch (Exception e)
            {
                Logger.LogError(AppLogEvent.HandleErrorResponse, e,
                                "Geo task update exception");
                return(ErrorResult("Geo task update exception"));
            }
        }