Updates in image model

updates_in_image.ex

defmodule App.Image do
  # updates from part #1
  # full image code https://gist.github.com/radzserg/3abc7a6fdac6fb98af8607d1b5a0cdaf
  
  alias App.Helpers.FileHelper
  alias App.Helpers.ImageHelper
  
  @doc """
  Return resized image from parent image
  """
  def resized_image(image, width, height) do
    case Repo.get_by(Image, parent_id: image.id, width: width, height: height) do
      nil -> create_resized_image(image, width, height)
      image -> image
    end
  end

  @doc """
  Create imge from local file
  """
  def create_from_file(path, type, filename \\ nil) do
    mime = FileHelper.get_mime!(path)
    size = FileHelper.get_size!(path)
    dest_path = if filename do
      build_path_from_path(path, type, filename)
    else
      build_path_from_path(path, type)
    end
    save_image_from_file(path, dest_path, mime, size, type)
  end 

  _ = """
  Creates resized image from given image
  """
  defp create_resized_image(image, width, height) do
    upload_manager = App.Pact.get("upload_manager")

    base_path = Application.get_env(:app, App.Endpoint)[:root]
    local_path = "#{base_path}/runtime/resize_cache/" <> random_string(32)

    upload_manager.save_to_local_file!(image.path, local_path)

    ImageHelper.thumb(local_path, local_path, width, height)

    path = build_path_from_path(image.path, image.type)

    save_image_from_file(local_path, path, image.mime, image.size, image.type, image.id)
  end
  
  defp save_image_from_file(file, path, mime, size, type, parent_id \\ nil) do
    changeset = Image.changeset(%Image{}, %{path: path, mime: mime,
      size: size, type: type, parent_id: parent_id})
    if changeset.valid? do
      upload_manager = App.Pact.get("upload_manager")
      case upload_manager.save_from_file!(file, path, %{content_type: mime}) do
        :ok ->
          case Repo.insert(changeset) do
            {:ok, image} -> {:ok, image}
            {:error, changeset} -> {:error, changeset}
          end
        {:error, reason} -> {:error, reason}
      end
    else
      {:error, changeset}
    end
  end


end