defmodule MvWeb.JoinRequestLive.Helpers do
  @moduledoc """
  Shared helpers for JoinRequest LiveViews (Index, Show): status display,
  badge variants, and reviewer display.
  """
  use Gettext, backend: MvWeb.Gettext

  @doc "Human-readable label for a join request status atom."
  def format_status(:pending_confirmation), do: gettext("Pending confirmation")
  def format_status(:submitted), do: gettext("Submitted")
  def format_status(:approved), do: gettext("Approved")
  def format_status(:rejected), do: gettext("Rejected")
  def format_status(other), do: to_string(other)

  @doc "Badge variant for the status (used with CoreComponents.badge)."
  def status_badge_variant(:submitted), do: :info
  def status_badge_variant(:approved), do: :success
  def status_badge_variant(:rejected), do: :error
  def status_badge_variant(_), do: :neutral

  @doc """
  Returns the reviewer display string (e.g. email) for a join request, or nil if none.

  Prefers the denormalized :reviewed_by_display (set on approve/reject) so the UI
  works for all roles without loading the User resource. Falls back to
  :reviewed_by_user when loaded (e.g. admin or legacy data before backfill).
  """
  def reviewer_display(req) when is_map(req) do
    case Map.get(req, :reviewed_by_display) do
      s when is_binary(s) ->
        trimmed = String.trim(s)
        if trimmed == "", do: reviewer_display_from_user(req), else: trimmed

      _ ->
        reviewer_display_from_user(req)
    end
  end

  def reviewer_display(_), do: nil

  defp reviewer_display_from_user(req) do
    user = Map.get(req, :reviewed_by_user)

    case user do
      nil ->
        nil

      %{email: email} when is_binary(email) ->
        s = String.trim(email)
        if s == "", do: nil, else: s

      %{"email" => email} when is_binary(email) ->
        s = String.trim(email)
        if s == "", do: nil, else: s

      _ ->
        nil
    end
  end
end