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# the Apache License, Version 2.0 (the "License"); you may
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#   http://www.apache.org/licenses/LICENSE-2.0
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# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied.  See the License for the
# specific language governing permissions and limitations
# under the License.
#
# This code was automatically generated from the Elasticsearch Specification
# See https://github.com/elastic/elasticsearch-specification
# See Elasticsearch::ES_SPECIFICATION_COMMIT for commit hash.
module Elasticsearch
  module API
    module Indices
      module Actions
        # Roll over to a new index.
        # TIP: It is recommended to use the index lifecycle rollover action to automate rollovers.
        # The rollover API creates a new index for a data stream or index alias.
        # The API behavior depends on the rollover target.
        # **Roll over a data stream**
        # If you roll over a data stream, the API creates a new write index for the stream.
        # The stream's previous write index becomes a regular backing index.
        # A rollover also increments the data stream's generation.
        # **Roll over an index alias with a write index**
        # TIP: Prior to Elasticsearch 7.9, you'd typically use an index alias with a write index to manage time series data.
        # Data streams replace this functionality, require less maintenance, and automatically integrate with data tiers.
        # If an index alias points to multiple indices, one of the indices must be a write index.
        # The rollover API creates a new write index for the alias with `is_write_index` set to `true`.
        # The API also `sets is_write_index` to `false` for the previous write index.
        # **Roll over an index alias with one index**
        # If you roll over an index alias that points to only one index, the API creates a new index for the alias and removes the original index from the alias.
        # NOTE: A rollover creates a new index and is subject to the `wait_for_active_shards` setting.
        # **Increment index names for an alias**
        # When you roll over an index alias, you can specify a name for the new index.
        # If you don't specify a name and the current index ends with `-` and a number, such as `my-index-000001` or `my-index-3`, the new index name increments that number.
        # For example, if you roll over an alias with a current index of `my-index-000001`, the rollover creates a new index named `my-index-000002`.
        # This number is always six characters and zero-padded, regardless of the previous index's name.
        # If you use an index alias for time series data, you can use date math in the index name to track the rollover date.
        # For example, you can create an alias that points to an index named `<my-index-{now/d}-000001>`.
        # If you create the index on May 6, 2099, the index's name is `my-index-2099.05.06-000001`.
        # If you roll over the alias on May 7, 2099, the new index's name is `my-index-2099.05.07-000002`.
        #
        # @option arguments [String] :alias Name of the data stream or index alias to roll over. (*Required*)
        # @option arguments [String] :new_index Name of the index to create.
        #  Supports date math.
        #  Data streams do not support this parameter.
        # @option arguments [Boolean] :dry_run If `true`, checks whether the current index satisfies the specified conditions but does not perform a rollover.
        # @option arguments [Time] :master_timeout Period to wait for a connection to the master node.
        #  If no response is received before the timeout expires, the request fails and returns an error. Server default: 30s.
        # @option arguments [Time] :timeout Period to wait for a response.
        #  If no response is received before the timeout expires, the request fails and returns an error. Server default: 30s.
        # @option arguments [Integer, String] :wait_for_active_shards The number of shard copies that must be active before proceeding with the operation.
        #  Set to all or any positive integer up to the total number of shards in the index (`number_of_replicas+1`). Server default: 1.
        # @option arguments [Boolean] :lazy If set to true, the rollover action will only mark a data stream to signal that it needs to be rolled over at the next write.
        #  Only allowed on data streams.
        # @option arguments [Boolean] :error_trace When set to `true` Elasticsearch will include the full stack trace of errors
        #  when they occur.
        # @option arguments [String] :filter_path Comma-separated list of filters in dot notation which reduce the response
        #  returned by Elasticsearch.
        # @option arguments [Boolean] :human When set to `true` will return statistics in a format suitable for humans.
        #  For example `"exists_time": "1h"` for humans and
        #  `"eixsts_time_in_millis": 3600000` for computers. When disabled the human
        #  readable values will be omitted. This makes sense for responses being consumed
        #  only by machines.
        # @option arguments [Boolean] :pretty If set to `true` the returned JSON will be "pretty-formatted". Only use
        #  this option for debugging only.
        # @option arguments [Hash] :headers Custom HTTP headers
        # @option arguments [Hash] :body request body
        #
        # @see https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-indices-rollover
        #
        def rollover(arguments = {})
          request_opts = { endpoint: arguments[:endpoint] || 'indices.rollover' }

          defined_params = [:alias, :new_index].each_with_object({}) do |variable, set_variables|
            set_variables[variable] = arguments[variable] if arguments.key?(variable)
          end
          request_opts[:defined_params] = defined_params unless defined_params.empty?

          raise ArgumentError, "Required argument 'alias' missing" unless arguments[:alias]

          arguments = arguments.clone
          headers = arguments.delete(:headers) || {}

          body = arguments.delete(:body)

          _alias = arguments.delete(:alias)

          _new_index = arguments.delete(:new_index)

          method = Elasticsearch::API::HTTP_POST
          path   = if _alias && _new_index
                     "#{Utils.listify(_alias)}/_rollover/#{Utils.listify(_new_index)}"
                   else
                     "#{Utils.listify(_alias)}/_rollover"
                   end
          params = Utils.process_params(arguments)

          Elasticsearch::API::Response.new(
            perform_request(method, path, params, body, headers, request_opts)
          )
        end
      end
    end
  end
end