defmodule Confient.Deposit do
  alias Confient.Student.Work
  alias Confient.Repo
  import Ecto.Query

  def list_works(), do: Repo.all(from w in Work, preload: [{:student, :class}, :assignment])

  def verify_date(due) do
    date = DateTime.now!(Application.fetch_env!(:confient, :timezone)) |> DateTime.to_date()
    if Timex.before?(date, due), do: :ok, else: {:error, :date_too_late}
  end

  def verify_file(file) do
    supported = [
      "application/pdf",
      "application/rtf",
      "application/vnd.oasis.opendocument.text",
      "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
      "application/msword"
    ]

    if Enum.member?(supported, file.content_type) do
      {:ok, Path.extname(file.filename)}
    else
      {:error, :invalid_file_type}
    end
  end

  def get_upload_dir(class_name, assignment_slug) do
    dir = Application.fetch_env!(:confient, :upload_dir)
    "#{dir}/#{class_name}/#{assignment_slug}"
  end

  def ensure_upload_dir(dir) do
    File.mkdir_p!(dir)
    dir
  end

  def gen_filename(
        class_name,
        assignment_slug,
        %Confient.School.Student{
          firstname: fname,
          lastname: lname
        },
        ext
      ) do
    Enum.join(
      [
        class_name,
        assignment_slug,
        "#{String.downcase(String.at(fname, 0) <> String.replace(lname, " ", "-"))}",
        String.replace(DateTime.to_iso8601(DateTime.now!("Europe/Paris")), ":", "-")
      ],
      "_"
    ) <> ext
  end
end