defmodule NLdoc.Spec.Image do
  @moduledoc """
  This module defines the Ecto schema for the NLdoc spec Image object.
  """
  use NLdoc.Spec.Schema, type: "https://spec.nldoc.nl/Resource/Image"

  @required [:id, :type, :source]
  @fields @required ++ [:alternative_text, :decorative]

  typed_embedded_schema null: false do
    field :id, Ecto.UUID
    field :type, :string, default: @resource_type
    field :source, :string
    field :alternative_text, :string, null: true
    field :decorative, :boolean, default: false

    embeds_many :caption, NLdoc.Spec.Paragraph

    field(:descriptors, {:array, PolymorphicEmbed},
      types: map(NLdoc.Spec.descriptors()),
      type_field_name: :type,
      on_replace: :delete,
      default: [],
      array?: true
    ) :: [NLdoc.Spec.descriptor()]
  end

  def changeset(object, attrs) do
    object
    |> cast(attrs, @fields, @cast_opts)
    |> cast_embed(:caption, @cast_opts)
    |> cast_polymorphic_embed(:descriptors, @cast_opts)
    |> validate_required(@required)
    |> validate_inclusion(:type, [@resource_type])
  end
end