defmodule DecentralisedBookIndex.Generators do
  @moduledoc "Generators for tests"

  use Ash.Generator
  alias DecentralisedBookIndex.Metadata
  alias DecentralisedBookIndex.Accounts

  @doc """
  Generates user changesets with the `:register_with_password` action.
  """
  def user(opts \\ []) do
    changeset_generator(
      DecentralisedBookIndex.Accounts.User,
      :register_with_password,
      defaults: [
        # Generates unique values using an auto-incrementing sequence
        # eg. `user1@example.com`, `user2@example.com`, etc.
        email: sequence(:user_email, &"user#{&1}@example.com"),
        password: "password",
        password_confirmation: "password"
      ],
      overrides: opts,
      after_action: fn user ->
        role = opts[:role] || :user
        Accounts.User.set_role!(user, role, authorize?: false)
      end,
      authorize?: false
    )
  end

  def author(opts \\ []) do
    actor =
      opts[:actor] ||
        once(:default_actor, fn ->
          generate(user(role: :moderator))
        end)

    changeset_generator(
      Metadata.Author,
      :create,
      defaults: [
        name: sequence(:name, &"Author #{&1}"),
        description: sequence(:name, &"Description #{&1}"),
        author_alias_registry_id: nil
      ],
      overrides: opts,
      actor: actor
    )
  end

  @doc """
  Generates a list of author roles.

  Example:
  > author_roles = author_roles()
  """
  def author_roles(opts \\ []) do
    actor =
      opts[:actor] ||
        once(:default_actor, fn ->
          generate(user(role: :moderator))
        end)

    authors =
      opts[:authors] ||
        for id <- 1..2 do
          generate(author(actor: actor)) #.id
        end

    count = min(opts[:count], length(authors))

    for {order, author} <- Enum.zip(1..count, authors) do
      %{order: order, author_id: author.id, role: ""}
    end
  end

  def dbi_server(opts \\ []) do
    actor =
      opts[:actor] ||
        once(:default_actor, fn ->
          generate(user(role: :admin))
        end)

    url =
      opts[:url] ||
        once(:default_actor, fn ->
          "http://localhost:4002"
        end)

    changeset_generator(
      Metadata.DBIServer,
      :create,
      defaults: [
        name: sequence(:name, &"Server #{&1}"),
        url: url
      ],
      overrides: opts,
      actor: actor
    )
  end

  @doc """
  Generates a list of bids.

  Example:
  > bids = bids()
  """
  def bids(opts \\ []) do
    actor =
      opts[:actor] ||
        once(:default_actor, fn ->
          generate(user(role: :moderator))
        end)

    count =
      opts[:count] || 2

    types = ["isbn10", "isbn13", "asin"]

    if count > length(types), do: count = length(types)

    random_types = Enum.take_random(types, count)

    for {order, type} <- Enum.zip(1..count, random_types) do
      %{order: order, type: type, bid: "1234567890"}
    end
  end

  @doc """
  Generates a publisher.
  """
  def publisher(opts \\ []) do
    actor =
      opts[:actor] ||
        once(:default_actor, fn ->
          generate(user(role: :moderator))
        end)

    changeset_generator(
      Metadata.Publisher,
      :create,
      defaults: [
        name: sequence(:name, &"Publisher #{&1}"),
      ],
      overrides: opts,
      actor: actor
    )
  end

  @doc """
  Generates a book.
  """
  def book(opts \\ []) do
    actor =
      opts[:actor] ||
        once(:default_actor, fn ->
          generate(user(role: :moderator))
        end)

    bids =
      opts[:bids] ||
        once(:default_bids, fn ->
          bids()
        end)

    authors = opts[:authors] || nil

    author_roles =
      opts[:author_roles] ||
        once(:default_author_roles, fn ->
          author_roles(authors: authors)
        end)

    publisher_id =
      opts[:publisher_id] ||
        once(:default_publisher, fn ->
          generate(publisher()).id
        end)

    related_book = opts[:related_book] || nil

    book_editions_registry_id =
      if related_book do
        related_book.book_editions_registry_id
      else
        nil
      end

    changeset_generator(
      Metadata.Book,
      :create,
      defaults: [
        title: sequence(:name, &"Book #{&1}"),
        description: sequence(:description, &"Description #{&1}"),
        language: sequence(:language, &"Language #{&1}"),
        format: sequence(:format, &"Format #{&1}"),
        page_count: sequence(:page_count, &(abs(&1)+1)),
        published: sequence(:published, &Date.add(~D[2025-03-04], &1)),
        bids: bids,
        author_roles: author_roles,
        publisher_id: publisher_id,
        book_editions_registry_id: book_editions_registry_id,
      ],
      overrides: opts,
      actor: actor
    )
  end
end