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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 Actions
      # Count search results.
      # Get the number of documents matching a query.
      # The query can be provided either by using a simple query string as a parameter, or by defining Query DSL within the request body.
      # The query is optional. When no query is provided, the API uses `match_all` to count all the documents.
      # The count API supports multi-target syntax. You can run a single count API search across multiple data streams and indices.
      # The operation is broadcast across all shards.
      # For each shard ID group, a replica is chosen and the search is run against it.
      # This means that replicas increase the scalability of the count.
      #
      # @option arguments [String, Array] :index A comma-separated list of data streams, indices, and aliases to search.
      #  It supports wildcards (`*`).
      #  To search all data streams and indices, omit this parameter or use `*` or `_all`.
      # @option arguments [Boolean] :allow_no_indices A setting that does two separate checks on the index expression.
      #  If `false`, the request returns an error (1) if any wildcard expression
      #  (including `_all` and `*`) resolves to zero matching indices or (2) if the
      #  complete set of resolved indices, aliases or data streams is empty after all
      #  expressions are evaluated. If `true`, index expressions that resolve to no
      #  indices are allowed and the request returns an empty result. Server default: true.
      # @option arguments [String] :analyzer The analyzer to use for the query string.
      #  This parameter can be used only when the `q` query string parameter is specified.
      # @option arguments [Boolean] :analyze_wildcard If `true`, wildcard and prefix queries are analyzed.
      #  This parameter can be used only when the `q` query string parameter is specified.
      # @option arguments [String] :default_operator The default operator for query string query: `and` or `or`.
      #  This parameter can be used only when the `q` query string parameter is specified. Server default: or.
      # @option arguments [String] :df The field to use as a default when no field prefix is given in the query string.
      #  This parameter can be used only when the `q` query string parameter is specified.
      # @option arguments [String, Array<String>] :expand_wildcards The type of index that wildcard patterns can match.
      #  If the request can target data streams, this argument determines whether wildcard expressions match hidden data streams.
      #  It supports comma-separated values, such as `open,hidden`. Server default: open.
      # @option arguments [Boolean] :ignore_throttled If `true`, concrete, expanded, or aliased indices are ignored when frozen. Server default: true.
      # @option arguments [Boolean] :ignore_unavailable If `false`, the request returns an error if it targets a concrete (non-wildcarded)
      #  index, alias, or data stream that is missing, closed, or otherwise unavailable.
      #  If `true`, unavailable concrete targets are silently ignored.
      # @option arguments [Boolean] :lenient If `true`, format-based query failures (such as providing text to a numeric field) in the query string will be ignored.
      #  This parameter can be used only when the `q` query string parameter is specified.
      # @option arguments [Float] :min_score The minimum `_score` value that documents must have to be included in the result.
      # @option arguments [String] :preference The node or shard the operation should be performed on.
      #  By default, it is random.
      # @option arguments [String, Array<String>] :routing A custom value used to route operations to a specific shard.
      #  Not allowed when `index.slice.enabled` is `true` for the target index; use `_slice` instead.
      # @option arguments [Array<String>, String] :stats Specific `tag` of the request for logging and statistical purposes.
      # @option arguments [String] :_slice The slice identifier used to route the operation to a specific slice.
      #  Use the special value `_all` to target all slices without restricting to a routing value.
      #  Required when `index.slice.enabled` is `true` for the target index; not allowed when `index.slice.enabled` is `false`.
      # @option arguments [Integer] :terminate_after The maximum number of documents to collect for each shard.
      #  If a query reaches this limit, Elasticsearch terminates the query early.
      #  Elasticsearch collects documents before sorting.IMPORTANT: Use with caution.
      #  Elasticsearch applies this parameter to each shard handling the request.
      #  When possible, let Elasticsearch perform early termination automatically.
      #  Avoid specifying this parameter for requests that target data streams with backing indices across multiple data tiers.
      # @option arguments [String] :q The query in Lucene query string syntax. This parameter cannot be used with a request body.
      # @option arguments [Boolean] :error_trace When set to `true` Elasticsearch will include the full stack trace of errors
      #  when they occur.
      # @option arguments [String, Array<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
      #  `"exists_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-count
      #
      def count(arguments = {})
        request_opts = { endpoint: arguments[:endpoint] || 'count' }

        defined_params = [: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?

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

        body = arguments.delete(:body)

        _index = arguments.delete(:index)

        method = if body
                   Elasticsearch::API::HTTP_POST
                 else
                   Elasticsearch::API::HTTP_GET
                 end

        path   = if _index
                   "#{Utils.listify(_index)}/_count"
                 else
                   '_count'
                 end
        params = Utils.process_params(arguments)

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