defmodule Mv.Membership.JoinRequest.Changes.ConfirmRequest do
  @moduledoc """
  Sets the join request to submitted (confirmation link clicked).

  Used by the confirm action after the user clicks the confirmation link.
  Only applies when the current status is `:pending_confirmation`, so that
  direct calls to the confirm action are idempotent and never overwrite
  :submitted, :approved, or :rejected. Token hash is kept so a second click
  can still find the record and return success without changing it.
  """
  use Ash.Resource.Change

  @spec change(Ash.Changeset.t(), keyword(), Ash.Resource.Change.context()) :: Ash.Changeset.t()
  def change(changeset, _opts, _context) do
    current_status = Ash.Changeset.get_data(changeset, :status)

    if current_status == :pending_confirmation do
      changeset
      |> Ash.Changeset.force_change_attribute(:status, :submitted)
      |> Ash.Changeset.force_change_attribute(:submitted_at, DateTime.utc_now())
    else
      changeset
    end
  end
end