it3s/meppit

class VersionsController < ApplicationController
  before_action :require_login,            only: [:revert]
  before_action :find_versionable,         only: [:history]
  before_action :find_version,             only: [:revert, :show]
  before_action :build_object_for_version, only: [:show]
  before_action :build_map_geo_data,       only: [:show]

  def history
    @versions = paginate @versionable.versions.reorder('created_at desc')
    respond_to do |format|
      format.html
      format.js
    end
  end


  def revert
    object = revert_to_version!
    redirect_to object, notice: t('versions.reverted', content: object.name)
  end

  def show
    render layout: nil
  end

  private

    def find_versionable
      @versionable = find_polymorphic_object
    end

    def find_version
      @version = PaperTrail::Version.find(params[:id])
    end

    def build_object_for_version
      @object = reified_object
    end

    def build_map_geo_data
      @geo_data_collection ||= paginate(@object.try(:geo_data), params[:data_page]) if @object.class.name == 'Map'
    end

    def revert_to_version!
      object = reified_object
      object.save!
      object
    end

    def reified_object
      object = @version.reify
      object.location = version_location if object.has_attribute?(:location)
      object
    end

    def version_location
      (SafeYAML.load(@version.object)["location"] || {})["wkt"]
    end
end