defmodule Faces.Gallery.Importer do
  alias Faces.Gallery.{Person, GithubUserData}
  alias Faces.Repo

  def import(username) do
    with {:ok, user_data} <- GithubUserData.get(username),
         {:ok, changeset} <- generate_changeset(user_data),
         {:ok, person} <- upsert(changeset) do
      {:ok, person}
    else
      {:error, reason} -> {:error, reason}
    end
  end

  defp generate_changeset(user_data) do
    {:ok, Person.changeset(%Person{}, user_data)}
  end

  defp upsert(changeset) do
    changeset
    |> Repo.insert(on_conflict: :replace_all, conflict_target: [:username])
  end
end