defmodule Ami.Resource do
  @moduledoc """
    Resource module is shared between the following modules:
    [ "Lesson",
      "Enrollment",
      "Course",
      "Post",
      "Tool",
      "Comment",
      "ReportPage",
      "CustomPage"
    ]
  """
  alias Ami.{
    Repo
  }

  import Ecto.Query

  use Ecto.Schema

  schema "resources" do
    field(:title, :string)
    field(:description, :string)
    field(:file, :string)
    field(:resourceable_id, :integer)
    field(:resourceable_type, :string)
    field(:created_at, :utc_datetime)
    field(:updated_at, :utc_datetime)
    field(:is_activity, :boolean)
    field(:downloaded_resources_count, :integer)
  end

  def preload_resources(struct, resourceable_type) do
    struct
    |> Repo.preload(
      resources:
        from(r in __MODULE__, where: r.resourceable_type == ^resourceable_type, order_by: r.id)
    )
  end

  def preload_resource(struct, resourceable_type) do
    struct
    |> Repo.preload(
      [
        resource:
          from(r in __MODULE__, where: r.resourceable_type == ^resourceable_type, order_by: r.id)
      ],
      force: true
    )
  end

  def file_url({id, file}) do
    case file do
      nil -> ""
      _ -> "https://ami-aws-s3.s3.amazonaws.com/uploads/resource/file/#{id}/#{file}"
    end
  end

  def activity_url(resources) do
    resource =
      Enum.find(resources, fn resource ->
        extension = String.split(resource.file, ".") |> Enum.at(1)
        Regex.match?(~r/Activity/, resource.title) && Regex.match?(~r/pdf/i, extension)
      end)

    file_url({resource.id, resource.file})
  end
end