defmodule SimpleshopThemeWeb.ThemeHook do
  @moduledoc """
  LiveView on_mount hook for theme settings, CSS, and media assigns.

  Mounted in the public_shop live_session alongside CartHook.
  Eliminates the identical theme-loading boilerplate from every shop LiveView.

  ## Actions

  - `:mount_theme` — loads theme settings, CSS, and media assigns
  - `:require_site_live` — redirects unauthenticated visitors to /coming-soon
    when the shop is not live
  """

  import Phoenix.Component, only: [assign: 3]

  alias SimpleshopTheme.{Products, Settings, Media}
  alias SimpleshopTheme.Theme.{CSSCache, CSSGenerator}

  def on_mount(:mount_theme, _params, _session, socket) do
    theme_settings = Settings.get_theme_settings()

    generated_css =
      case CSSCache.get() do
        {:ok, css} ->
          css

        :miss ->
          css = CSSGenerator.generate(theme_settings)
          CSSCache.put(css)
          css
      end

    socket =
      socket
      |> assign(:theme_settings, theme_settings)
      |> assign(:generated_css, generated_css)
      |> assign(:logo_image, Media.get_logo())
      |> assign(:header_image, Media.get_header())
      |> assign(:categories, Products.list_categories())
      |> assign(:mode, :shop)
      |> assign(
        :is_admin,
        !!(socket.assigns[:current_scope] && socket.assigns.current_scope.user)
      )

    {:cont, socket}
  end

  def on_mount(:require_site_live, _params, _session, socket) do
    cond do
      Settings.site_live?() ->
        {:cont, socket}

      # mount_current_scope runs first, so current_scope is already validated
      socket.assigns[:current_scope] && socket.assigns.current_scope.user ->
        {:cont, socket}

      not SimpleshopTheme.Accounts.has_admin?() ->
        # Fresh install — send to registration
        {:halt, Phoenix.LiveView.redirect(socket, to: "/users/register")}

      true ->
        {:halt, Phoenix.LiveView.redirect(socket, to: "/coming-soon")}
    end
  end
end
