module Fog
  module AWS
    class RDS
      class Real
        require 'fog/aws/parsers/rds/describe_db_parameter_groups'

        # This API returns a list of DBParameterGroup descriptions. If a DBParameterGroupName is specified, the list will contain only the descriptions of the specified DBParameterGroup
        # http://docs.amazonwebservices.com/AmazonRDS/latest/APIReference/API_DescribeDBParameterGroups.html
        # ==== Parameters
        # * DBParameterGroupName <~String> - The name of a specific database parameter group to return details for.
        # * Source <~String> - The parameter types to return. user | system | engine-default
        # ==== Returns
        # * response<~Excon::Response>:
        #   * body<~Hash>:
        def describe_db_parameter_groups(name=nil, opts={})
          params={}
          if opts[:marker]
            params['Marker'] = opts[:marker]
          end
          if name
            params['DBParameterGroupName'] = name
          end
          if opts[:max_records]
            params['MaxRecords'] = opts[:max_records]
          end

          request({
            'Action'  => 'DescribeDBParameterGroups',
            :parser   => Fog::Parsers::AWS::RDS::DescribeDBParameterGroups.new
          }.merge(params))
        end
      end

      class Mock
        def describe_db_parameter_groups(name=nil, opts={})
          response = Excon::Response.new
          parameter_set = []
          if name
            if server = self.data[:parameter_groups][name]
              parameter_set << server
            else
              raise Fog::AWS::RDS::NotFound.new("DBInstance #{name} not found")
            end
          else
            parameter_set = self.data[:parameter_groups].values
          end

          response.status = 200
          response.body = {
            "ResponseMetadata"=>{ "RequestId"=> Fog::AWS::Mock.request_id },
            "DescribeDBParameterGroupsResult" => { "DBParameterGroups" => parameter_set }
          }
          response
        end
      end
    end
  end
end