module Fog
  module AWS
    class Elasticache
      class Real

        require 'fog/aws/parsers/elasticache/single_cache_cluster'

        # Modifies an existing cache cluster
        # Returns a cache cluster description
        #
        # === Required Parameters
        # * id <~String> - The ID of the existing cluster to be modified
        # === Optional Parameters
        # * options <~Hash> - All optional parameters should be set in this Hash:
        #   * :apply_immediately <~TrueFalseClass> - whether to apply changes now
        #   * :auto_minor_version_upgrade <~TrueFalseClass>
        #   * :num_nodes <~Integer> - The number of nodes in the Cluster
        #   * :nodes_to_remove <~Array> - Array of node IDs to delete
        #   * :security_group_names <~Array> - Array of Elasticache::SecurityGroup names
        #   * :parameter_group_name <~String> - Name of the Cluster's ParameterGroup
        #   * :engine_version <~String> - The Cluster's caching software version
        #   * :notification_topic_arn <~String> - Amazon SNS Resource Name
        #   * :notification_topic_status <~String> - Amazon SNS Topic status
        #   * :preferred_maintenance_window <~String>
        # === Returns
        # * response <~Excon::Response>:
        #   * body <~Hash>
        def modify_cache_cluster(id, options = {})
          # Construct Cache Security Group parameters in the format:
          #   CacheSecurityGroupNames.member.N => "security_group_name"
          group_names = options[:security_group_names] || []
          sec_group_params = group_names.inject({}) do |group_hash, name|
            index = group_names.index(name) + 1
            group_hash["CacheSecurityGroupNames.member.#{index}"] = name
            group_hash
          end
          # Construct CacheNodeIdsToRemove parameters in the format:
          #   CacheNodeIdsToRemove.member.N => "node_id"
          node_ids = options[:nodes_to_remove] || []
          node_id_params = node_ids.inject({}) do |node_hash, id|
            index = node_ids.index(name) + 1
            node_hash["CacheNodeIdsToRemove.member.#{index}"] = id
            node_hash
          end
          # Merge the Cache Security Group parameters with the normal options
          request(node_id_params.merge(sec_group_params.merge(
            'Action'                      => 'ModifyCacheCluster',
            'CacheClusterId'              => id,
            'ApplyImmediately'            => options[:apply_immediately],
            'NumCacheNodes'               => options[:num_nodes],
            'AutoMinorVersionUpgrade'     => options[:auto_minor_version_upgrade],
            'CacheParameterGroupName'     => options[:parameter_group_name],
            'EngineVersion'               => options[:engine_version],
            'NotificationTopicArn'        => options[:notification_topic_arn],
            'NotificationTopicStatus'     => options[:notification_topic_status],
            'PreferredMaintenanceWindow'  => options[:preferred_maintenance_window],
            :parser => Fog::Parsers::AWS::Elasticache::SingleCacheCluster.new
          )))
        end

      end

      class Mock
        def modify_cache_cluster
          Fog::Mock.not_implemented
        end
      end
    end
  end
end