defmodule Localiser.Domain.Firmware do
  @moduledoc false

  def firmware_dir do
    dir = Application.app_dir(:localiserd, "priv/firmware")
    File.mkdir_p!(dir)
    dir
  end

  def store(version, %Plug.Upload{path: tmp_path}) do
    dest = Path.join(firmware_dir(), "#{version}.bin")
    case File.cp(tmp_path, dest) do
      :ok -> {:ok, version}
      {:error, reason} -> {:error, reason}
    end
  end

  def list do
    dir = firmware_dir()

    dir
    |> File.ls!()
    |> Enum.filter(&String.ends_with?(&1, ".bin"))
    |> Enum.map(fn filename ->
      version = String.replace_suffix(filename, ".bin", "")
      path = Path.join(dir, filename)
      stat = File.stat!(path, time: :posix)
      %{version: version, size: stat.size, uploaded_at: stat.mtime}
    end)
    |> Enum.sort_by(& &1.uploaded_at, :desc)
  end

  def get(version) do
    path = Path.join(firmware_dir(), "#{version}.bin")
    if File.exists?(path), do: {:ok, path}, else: :not_found
  end
end