public int ImportEntitiesFromFile(string filePath)
{
var existingEntitiesCount = _repository.GetAll().Count();
if (existingEntitiesCount > 0)
{
_logger.LogInformation($"Entities of type '{typeof(T).Name}' have been already imported.");
return(0);
}
_logger.LogInformation($"Reading file with {typeof(T).Name}s . . .");
var entityLines = File.ReadLines(filePath).ToList();
_entityBuilder.ReadEntityMappings(entityLines.First());
entityLines.RemoveAt(0);
_logger.LogInformation($"Mapping to {typeof(T).Name} objects . . .");
var mappedEntities = entityLines.Select(line => _entityBuilder.Build(line)).ToList();
_logger.LogInformation($"Read {mappedEntities.Count} lines of {typeof(T).Name}.");
SortEntities(mappedEntities);
var entitiesCount = SaveEntities(mappedEntities);
_logger.LogInformation($"{entitiesCount} entities of type '{typeof(T).Name}' have been successfully saved.");
return(entitiesCount);
}