module Lookbook
  class PreviewsController < ApplicationController
    include TargetableConcern
    include WithPreviewControllerConcern

    layout false

    before_action :permit_framing, only: [:show]

    def self.controller_path
      "lookbook/previews"
    end

    def index
      respond_to do |format|
        format.json do
          render(
            json: Lookbook.previews.map do |preview|
              {
                name: preview.name,
                scenarios: preview.scenarios.map { |scenario|
                  case scenario
                  when Lookbook::ScenarioEntity
                    scenario_json(scenario)
                  when Lookbook::ScenarioGroupEntity
                    {
                      name: scenario.name,
                      examples: scenario.scenarios.map { |s| scenario_json(s) }
                    }
                  end
                }
              }
            end
          )
        end
      end
    end

    def show
      if @target
        begin
          opts = {layout: @preview.layout}
          if embedded?
            opts[:append_html] = render_to_string("lookbook/partials/_iframe_content_scripts", layout: nil)
          end
          @preview_html = preview_controller.process(:render_in_layout_to_string, "lookbook/previews/group", inspector_data, **opts)
        rescue => exception
          render_in_layout "lookbook/error",
            layout: "lookbook/skeleton",
            error: prettify_error(exception)
        end
      else
        show_404
      end
    end

    private

    def embedded?
      params[:lookbook_embed] == "true"
    end

    def scenario_json(scenario)
      {
        name: scenario.name,
        inspect_path: scenario.url_path,
        preview_path: scenario.preview_path
      }
    end

    def permit_framing
      headers["X-Frame-Options"] = Lookbook.config.preview_embeds.policy if embedded?
      headers["X-Frame-Options"] = "SAMEORIGIN" if headers["X-Frame-Options"] == "DENY"
    end
  end
end