ash_graphql/lib/ash_graphql.ex

defmodule AshGraphql do
  @moduledoc """
  AshGraphql is a graphql front extension for the Ash framework.

  See the getting started guide for information on setting it up, and
  see the `AshGraphql.Resource` documentation for docs on its DSL
  """

  defmacro __using__(opts) do
    quote bind_quoted: [api: opts[:api]] do
      defmodule AshTypes do
        @moduledoc false
        alias Absinthe.{Blueprint, Phase, Pipeline}

        def pipeline(pipeline) do
          Pipeline.insert_before(
            pipeline,
            Phase.Schema.Validation.QueryTypeMustBeObject,
            __MODULE__
          )
        end

        def run(blueprint, _opts) do
          api = unquote(api)
          Code.ensure_compiled(api)

          blueprint_with_queries =
            api
            |> AshGraphql.Api.queries(__MODULE__)
            |> Enum.reduce(blueprint, fn query, blueprint ->
              Absinthe.Blueprint.add_field(blueprint, "RootQueryType", query)
            end)

          blueprint_with_mutations =
            api
            |> AshGraphql.Api.mutations(__MODULE__)
            |> Enum.reduce(blueprint_with_queries, fn mutation, blueprint ->
              Absinthe.Blueprint.add_field(blueprint, "RootMutationType", mutation)
            end)

          new_defs =
            List.update_at(blueprint_with_mutations.schema_definitions, 0, fn schema_def ->
              %{
                schema_def
                | type_definitions:
                    schema_def.type_definitions ++
                      AshGraphql.Api.type_definitions(api, __MODULE__)
              }
            end)

          {:ok, %{blueprint_with_mutations | schema_definitions: new_defs}}
        end
      end

      @pipeline_modifier AshTypes
    end
  end

  defguard is_digit(x) when x in ?0..?0

  def roll(schema) do
    Enum.map(schema, fn
      <<?d, x, y>> when is_digit(x) and is_digit(y) ->
        Enum.random(1..String.to_integer(<<x, y>>))

      <<?d, x, y, z>> when is_digit(x) and is_digit(y) and is_digit(z) ->
        Enum.random(1..String.to_integer(<<x, y, z>>))

      "adv" ->
        {:max, roll(["d20", "d20"])}

      "dis" ->
        {:min, roll(["d20", "d20"])}

      x ->
        x
    end)
  end
end