defmodule GlificWeb.Schema do
  @moduledoc """
  This is the container for the top level Absinthe GraphQL schema which encapsulates the entire Glific Public API.
  This file is primarily a container and pulls in the relevant information for data type specific files.
  """

  use Absinthe.Schema

  alias Glific.Repo
  alias GlificWeb.Schema.Middleware

  import_types(Absinthe.Type.Custom)

  import_types(__MODULE__.ContactTypes)
  import_types(__MODULE__.ContactTagTypes)
  import_types(__MODULE__.ConversationTypes)
  import_types(__MODULE__.EnumTypes)
  import_types(__MODULE__.GenericTypes)
  import_types(__MODULE__.LanguageTypes)
  import_types(__MODULE__.MessageTypes)
  import_types(__MODULE__.MessageMediaTypes)
  import_types(__MODULE__.MessageTagTypes)
  import_types(__MODULE__.OrganizationTypes)
  import_types(__MODULE__.ProviderTypes)
  import_types(__MODULE__.SessionTemplateTypes)
  import_types(__MODULE__.TagTypes)

  query do
    import_fields(:contact_queries)

    import_fields(:conversation_queries)

    import_fields(:language_queries)

    import_fields(:message_queries)

    import_fields(:message_media_queries)

    import_fields(:organization_queries)

    import_fields(:provider_queries)

    import_fields(:session_template_queries)

    import_fields(:tag_queries)
  end

  mutation do
    import_fields(:contact_mutations)

    import_fields(:contact_tag_mutations)

    import_fields(:language_mutations)

    import_fields(:message_mutations)

    import_fields(:message_media_mutations)

    import_fields(:message_tag_mutations)

    import_fields(:organization_mutations)

    import_fields(:provider_mutations)

    import_fields(:session_template_mutations)

    import_fields(:tag_mutations)
  end

  subscription do
    import_fields(:message_subscriptions)
  end

  @doc """
  Used to apply middleware on all or a group of fields based on pattern matching.

  It is passed the existing middleware for a field, the field itself, and the object that the field is a part of.
  """

  @spec middleware(
          [Absinthe.Middleware.spec(), ...],
          Absinthe.Type.Field.t(),
          Absinthe.Type.Object.t()
        ) :: [Absinthe.Middleware.spec(), ...]
  def middleware(middleware, _field, %{identifier: :mutation}),
    do: middleware ++ [Middleware.ChangesetErrors]

  def middleware(middleware, _field, %{identifier: :query}),
    do: middleware ++ [Middleware.QueryErrors]

  def middleware(middleware, _field, _object),
    do: middleware

  @doc """
  Used to set some values in the context that we may need in order to run. For now we are just using it
  for Dataloader perspectives.

  I think we will be storing authentication and current user in the context map in future releases
  """
  @spec context(map()) :: map()
  def context(ctx) do
    loader =
      Dataloader.new()
      |> Dataloader.add_source(Repo, Dataloader.Ecto.new(Repo))

    Map.put(ctx, :loader, loader)
  end

  @doc """
  Used to define the list of plugins to run before and after resolution.
  """
  @spec plugins() :: [Absinthe.Plugin.t()]
  def plugins do
    [Absinthe.Middleware.Dataloader] ++ Absinthe.Plugin.defaults()
  end
end