# SPDX-FileCopyrightText: 2025 diffo_example contributors <https://github.com/diffo-dev/diffo_example/graphs.contributors>
#
# SPDX-License-Identifier: MIT

defmodule DiffoExample.Access.Shelf do
  @moduledoc """
  Diffo - TMF Service and Resource Management with a difference

  Shelf - Shelf Resource Instance
  """

  alias Diffo.Provider.BaseInstance
  alias Diffo.Provider.Instance.Relationship
  alias Diffo.Provider.Instance.Characteristic
  alias Diffo.Provider.Assigner
  alias Diffo.Provider.Assignment

  alias DiffoExample.Access

  use Ash.Resource,
    fragments: [BaseInstance],
    domain: Access

  resource do
    description "An Ash Resource representing a Shelf"
    plural_name :Shelves
  end

  structure do
    specification do
      id "ef016d85-9dbd-429c-84da-1df56cc7dda5"
      name "shelf"
      type :resourceSpecification
      description "A Shelf Resource Instance which contain cards"
      category "Network Resource"
    end

    characteristics do
      characteristic :shelf, DiffoExample.Access.ShelfValue
      characteristic :slots, Diffo.Provider.AssignableValue
    end
  end

  behaviour do
    actions do
      create :build
    end
  end

  actions do
    create :build do
      description "creates a new Shelf resource instance for build"
      accept [:id, :name, :type, :which]
      argument :relationships, {:array, :struct}
      argument :places, {:array, :struct}
      argument :parties, {:array, :struct}

      change set_attribute(:type, :resource)
      change load [:href]
      upsert? false
    end

    update :define do
      description "defines the shelf"
      argument :characteristic_value_updates, {:array, :term}

      change after_action(fn changeset, result, _context ->
               with {:ok, result} <- Characteristic.update_values(result, changeset),
                    {:ok, result} <- Access.get_shelf_by_id(result.id),
                    do: {:ok, result}
             end)
    end

    update :relate do
      description "relates the shelf with cards"
      argument :relationships, {:array, :struct}

      change after_action(fn changeset, result, _context ->
               with {:ok, result} <- Relationship.relate_instance(result, changeset),
                    {:ok, result} <- Access.get_shelf_by_id(result.id),
                    do: {:ok, result}
             end)
    end

    update :assign_slot do
      description "relates the shelf with an instance by assigning a slot"
      argument :assignment, :struct, constraints: [instance_of: Assignment]

      change after_action(fn changeset, result, _context ->
               with {:ok, result} <- Assigner.assign(result, changeset, :slots, :slot),
                    {:ok, result} <- Access.get_shelf_by_id(result.id),
                    do: {:ok, result}
             end)
    end
  end
end