require 'lib/string_helper'
require 'db/mongo/models/stack_template/stack_template_factory'

module Devops
  module StackTemplatePresets
    class Base

      def id
        StringHelper.underscore_class(self.class)
      end

      def to_hash
        {id: id, template_body: template_body}
      end

      def create_stack_from_preset(provider, stack_id, parameters)
        find_or_create_stack_template!(provider)
        Model::StackFactory.create(provider, {
          'id' => stack_id,
          'provider' => provider,
          'parameters' => parameters,
          'stack_template' => stack_template_name(provider)
        })
      end

      def template_body
        file_name = File.join("lib/stack_template_presets/#{id}.#{template_file_extension}")
        File.read(file_name)
      end

      # some templates may be YAML files
      def template_file_extension
        :json
      end

      private

      def find_or_create_stack_template!(provider)
        name = stack_template_name(provider)
        begin
          Devops::Api2.settings.mongo.stack_template(name)
        rescue RecordNotFound
          template = Model::StackTemplateFactory.create(provider, {
            'id' => name,
            'provider' => provider,
            'template_body' => template_body
          })
          Devops::Api2.settings.mongo.stack_template_insert(template)
        end
      end

      def stack_template_name(provider)
        "#{id}_#{provider}_preset"
      end

    end
  end
end