docspec

defmodule DocSpec.Spec.BlockQuotation do
  @moduledoc """
  A quotation set off from the main text as a block. Equivalent to HTML `<blockquote>` element.

  ## Fields

  * `cite` - A URI that designates a source document or message for the quoted information.
  * `caption` - A caption providing attribution for the quotation. Allowed types: `DocSpec.Spec.Paragraph`.
  * `children` (required) - Allowed types: `DocSpec.Spec.Paragraph`, `DocSpec.Spec.Image`, `DocSpec.Spec.Heading`, `DocSpec.Spec.OrderedList`, `DocSpec.Spec.UnorderedList`, `DocSpec.Spec.Table`, `DocSpec.Spec.DefinitionList`, `DocSpec.Spec.BlockQuotation`.
  * `id` (required)
  * `type` - Always `"https://alpha.docspec.io/BlockQuotation"`.
  """

  use DocSpec.Spec.Schema, type: "https://alpha.docspec.io/BlockQuotation"

  typed_embedded_schema null: false do
    # A URI that designates a source document or message for the quoted information.
    field :cite, :string
    # A caption providing attribution for the quotation.
    embeds_many :caption, DocSpec.Spec.Paragraph

    polymorphic_embeds_many :children,
      types: [
        "https://alpha.docspec.io/Paragraph": DocSpec.Spec.Paragraph,
        "https://alpha.docspec.io/Image": DocSpec.Spec.Image,
        "https://alpha.docspec.io/Heading": DocSpec.Spec.Heading,
        "https://alpha.docspec.io/OrderedList": DocSpec.Spec.OrderedList,
        "https://alpha.docspec.io/UnorderedList": DocSpec.Spec.UnorderedList,
        "https://alpha.docspec.io/Table": DocSpec.Spec.Table,
        "https://alpha.docspec.io/DefinitionList": DocSpec.Spec.DefinitionList,
        "https://alpha.docspec.io/BlockQuotation": DocSpec.Spec.BlockQuotation
      ],
      type_field_name: :type,
      on_replace: :delete

    field :id, :string
    field :type, :string, default: @resource_type
  end

  @doc """
  Validates and casts the given attributes into a changeset.

  Ensures all required fields are present, embedded schemas are properly
  cast, and field values conform to their expected types and constraints.
  """
  def changeset(schema, attrs) do
    schema
    |> cast(attrs, [:cite, :id, :type], @cast_opts)
    |> cast_embed(:caption, @cast_opts)
    |> cast_polymorphic_embed(:children, @cast_opts ++ [required: true])
    |> validate_required([:id])
    |> validate_inclusion(:type, [@resource_type])
    |> validate_uuid()
  end
end