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

  import Ecto.{
    Changeset,
    Query
  }

  alias Ami.{
    Course,
    Repo
  }

  alias Ami.TeaserImageAttachmentUploader.Type

  schema "teaser_image_attachments" do
    field(:name, :string)
    field(:page_position, :integer)
    field(:file, Type)
    timestamps()

    belongs_to(:course, Course)
  end

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

      changeset ->
        changeset
    end
  end

  # enum page_position: [ :main, :detail, :box, :certificate, :teaser_box, :download_certificate ]
  def page_positions do
    [
      {"main", 0},
      {"detail", 1},
      {"box", 2},
      {"certificate", 3},
      {"teaser_box", 4},
      {"download_certificate", 5}
    ]
  end

  def preload_main_teaser_images(course) do
    course
    |> Repo.preload(
      teaser_image_attachments: from(ti in __MODULE__, where: ti.page_position == 0)
    )
  end

  def preload_preview_images(course) do
    course
    |> Repo.preload(
      teaser_image_attachments: from(ti in __MODULE__, where: ti.page_position == 4)
    )
  end

  def preload_detail_teaser_images(course) do
    course
    |> Repo.preload(
      teaser_image_attachments: from(ti in __MODULE__, where: ti.page_position == 1)
    )
  end

  def preload_certificate_teaser_images(course) do
    course
    |> Repo.preload(
      teaser_image_attachments: from(ti in __MODULE__, where: ti.page_position == 3)
    )
  end

  def preload_download_certificate_teaser_images(course) do
    course
    |> Repo.preload(
      teaser_image_attachments: from(ti in __MODULE__, where: ti.page_position == 5)
    )
  end

  def teaser_image_from(list) do
    ti = List.last(list)
    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/teaser_image/file#{
                ti.file.file_name
              }"

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

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

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

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

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