defmodule Mercury.Attachment do
  @moduledoc "A file attachment with a short-lived presigned download URL."

  @type t :: %__MODULE__{
          id: String.t(),
          file_name: String.t(),
          url: String.t(),
          download_url: String.t(),
          created_at: DateTime.t() | nil,
          attachment_type: String.t() | nil
        }

  defstruct [:id, :file_name, :url, :download_url, :created_at, :attachment_type]

  @doc false
  def from_json(map) when is_map(map) do
    %__MODULE__{
      id: map["id"],
      file_name: map["fileName"],
      url: map["url"],
      download_url: map["downloadUrl"],
      created_at: Mercury.Types.datetime(map["createdAt"]),
      attachment_type: map["attachmentType"]
    }
  end
end

defmodule Mercury.Attachments do
  @moduledoc "The Mercury Attachments API — file attachment metadata and download URLs."

  alias Mercury.{Attachment, Client, HTTP, Support}

  @doc """
  Returns attachment metadata, including a short-lived presigned download
  URL. `GET /attachments/{id}`
  """
  @spec get(client :: Client.t(), attachment_id :: String.t()) ::
          {:ok, Attachment.t()} | {:error, Exception.t()}
  def get(%Client{} = client, attachment_id) do
    with {:ok, body} <- HTTP.get(client, "attachments/#{attachment_id}") do
      {:ok, Attachment.from_json(body)}
    end
  end

  @spec get!(client :: Client.t(), attachment_id :: String.t()) :: Attachment.t()
  def get!(client, attachment_id), do: Support.bang!(get(client, attachment_id))
end