module Devops
  module Model
    class StackTemplateEc2 < StackTemplateBase

      # In Amazon Cloudformation the template file must be stored on an Amazon S3 bucket.
      attr_accessor :template_url

      # types template_url: {type: String, empty: false}

      def initialize(attrs)
        self.template_url = attrs['template_url']
        super(attrs)
      end

      def to_hash_without_id
        super.merge(template_url: template_url)
      end

      def delete_template_file_from_storage
        raise 'Implement me'
      end

      class << self

        def create(attrs)
          template = attrs['template_body']
          attrs['template_url'] = generate_template_file_and_upload_to_storage(attrs['id'], template)
          super(attrs)
        end

        private

        def generate_template_file_and_upload_to_storage(id, json)
          begin
            tempfile = Tempfile.new('foo')
            tempfile.write(json)
            tempfile.close
            secure_filename = "#{id}-#{SecureRandom.hex}.template"
            upload_file_to_storage(secure_filename, tempfile.path)
          ensure
            tempfile.unlink
          end
        end

        def upload_file_to_storage(filename, file_path)
          "https://s3.amazonaws.com/#{filename}"
        end

      end

    end
  end
end