module Scrivito
  class WorkspacesController < WebserviceController
    around_action only: [:check, :publish_approval] do |_, block|
      authorize_workspace_access(:publish, current_workspace, &block)
    end

    def check
      assert_workspace_is_not_outdated unless current_workspace.auto_update?
      @check_result = publish_checker.call(params[:from].to_i)
    end

    def publish_approval
      if valid_publish_request?
        @approval = current_workspace.api_request(:put, '/publish_approval',
          if_content_state_id_equals: current_workspace.content_state_id,
          user_id: scrivito_user.id)
      else
        raise_content_state_id_changed
      end
    rescue ScrivitoError => e
      raise ClientError.new(e.message)
    end

    private

    def valid_publish_request?
      publish_checker.passing_certificates?(certificates_param)
    end

    def publish_checker
      Workspace::PublishChecker.new(current_workspace, scrivito_user)
    end

    def current_workspace
      @current_workspace ||= Workspace.find(params[:id])
    end

    def certificates_param
      assert_valid_certificates_param
      params[:certificates]
    end

    def assert_workspace_is_not_outdated
      if current_workspace.outdated?
        raise ClientError.new(
          'Workspace is outdated. Please update your working copy.',
          backend_code: 'precondition_not_verifiable.workspace.publish.content_state_id',
        )
      end
    end

    def assert_valid_certificates_param
      if params[:certificates].blank?
        raise ClientError.new("Required parameter 'certificates' is missing.")
      end
      unless params[:certificates].is_a?(Array)
        raise ClientError.new("Parameter 'certificates' is not an array.")
      end
    end

    def raise_content_state_id_changed
      raise ClientError.new(
        'Content state id changed',
        backend_code: 'precondition_not_met.workspace.publish.content_state_id',
      )
    end
  end
end