# File lib/fog/aws/requests/compute/describe_spot_price_history.rb, line 61
        def describe_spot_price_history(filters = {})
          params = {}
          spot_price_history_set = []

          response = Excon::Response.new
          response.status = 200

          for key in %w(StartTime EndTime NextToken)
            if filters.is_a?(Hash) && filters.key?(key)
              Fog::Logger.warning("#{key} filters are not yet mocked [light_black](#{caller.first})[/]")
              Fog::Mock.not_implemented
            end
          end

          for key in %w(AvailabilityZone MaxResults)
            if filters.is_a?(Hash) && filters.key?(key)
              params[key] = filters.delete(key)
            end
          end

          all_zones = describe_availability_zones.body['availabilityZoneInfo'].map { |z| z['zoneName'] }
          zones = params['AvailabilityZone']
          if (!zones.nil? && !all_zones.include?([*zones].shuffle.first))
            az_error = "InvalidParameterValue => Invalid availability zone: [#{zones}]"
            raise Fog::Compute::AWS::Error, az_error
          end
          zones = all_zones if zones.nil?

          max_results = params['MaxResults'] || Fog::Mock.random_numbers(3).to_i
          if !(max_results.is_a?(Integer) && max_results > 0)
            max_results_error = "InvalidParameterValue => Invalid value '#{max_results}' for maxResults"
            raise Fog::Compute::AWS::Error, max_results_error
          end

          all_instance_types = flavors.map { |f| f.id }
          instance_types = filters.delete('InstanceType') || all_instance_types
          product_descriptions = filters.delete('ProductDescription') || Fog::AWS::Mock.spot_product_descriptions

          max_results.times do
            spot_price_history_set << {
              'instanceType'       => [*instance_types].shuffle.first,
              'productDescription' => [*product_descriptions].shuffle.first,
              'spotPrice'          => ((rand + [0 , 1].shuffle.first) * 10000).round / 10000.0,
              'timestamp'          => Time.now - (1 + rand(86400)),
              'availabilityZone'   => [*zones].shuffle.first
            }
          end
          spot_price_history_set.sort! { |x,y| x['timestamp'] <=> y['timestamp'] }

          response.body = {
            'spotPriceHistorySet' => spot_price_history_set,
            'requestId'           => Fog::AWS::Mock.request_id,
            'nextToken'           => nil
          }
          response
        end