defmodule Ami.ThumbImageAttachment do
  use Ecto.Schema
  use Arc.Ecto.Schema

  import Ecto.{
    Changeset
  }

  alias Ami.{
    Course
  }

  alias Ami.ThumbImageAttachmentUploader.Type

  schema "thumb_image_attachments" do
    field(:file_name, :string)
    field(:file, Type)
    timestamps()

    belongs_to(:course, Course)
  end

  def changeset(struct, params \\ %{}) do
    struct
    |> cast(params, [:file_name, :course_id])
    |> cast_attachments(params, [:file])
    |> case do
      %{valid?: false, changes: changes} = changeset when changes == %{} ->
        %{changeset | action: :ignore}

      changeset ->
        changeset
    end
  end

  # NOTE : Ugly hack around image path, at some point we must regenerate the old courses image attachments to normalize their url
  def thumb_image_for_course(struct) do
    ti = List.last(struct)
    env = Application.get_env(:ami_web, :env)

    if !is_nil(ti) do
      case Regex.match?(~r{/\d+/\w+}, ti.file.file_name) do
        true ->
          case env do
            :dev ->
              "https://ami-aws-staging.s3.amazonaws.com/uploads/thumb_image/file#{
                ti.file.file_name
              }"

            :staging ->
              "https://ami-aws-staging.s3.amazonaws.com/uploads/thumb_image/file#{
                ti.file.file_name
              }"

            :prod ->
              "https://ami-aws-s3.s3.amazonaws.com/uploads/thumb_image/file#{ti.file.file_name}"
          end

        _ ->
          case env do
            :dev ->
              "https://ami-aws-staging.s3.amazonaws.com/uploads/thumb_image/file/#{
                ti.file.file_name
              }"

            :staging ->
              "https://ami-aws-staging.s3.amazonaws.com/uploads/thumb_image/file/#{
                ti.file.file_name
              }"

            :prod ->
              "https://ami-aws-s3.s3.amazonaws.com/uploads/thumb_image/file/#{ti.file.file_name}"
          end
      end
    end
  end
end