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# license agreements. See the NOTICE file distributed with
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# the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# 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.

module Elasticsearch
  module API
    module Indices
      module Actions
        # Returns information about whether a particular index template exists.
        # This functionality is Experimental and may be changed or removed
        # completely in a future release. Elastic will take a best effort approach
        # to fix any issues, but experimental features are not subject to the
        # support SLA of official GA features.
        #
        # @option arguments [String] :name The name of the template
        # @option arguments [Boolean] :flat_settings Return settings in flat format (default: false)
        # @option arguments [Time] :master_timeout Explicit operation timeout for connection to master node
        # @option arguments [Boolean] :local Return local information, do not retrieve the state from master node (default: false)
        # @option arguments [Hash] :headers Custom HTTP headers
        #
        # @see https://www.elastic.co/guide/en/elasticsearch/reference/master/indices-templates.html
        #
        def exists_index_template(arguments = {})
          raise ArgumentError, "Required argument 'name' missing" unless arguments[:name]

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

          arguments = arguments.clone

          _name = arguments.delete(:name)

          method = Elasticsearch::API::HTTP_HEAD
          path   = "_index_template/#{Utils.__listify(_name)}"
          params = Utils.__validate_and_extract_params arguments, ParamsRegistry.get(__method__)

          body = nil
          perform_request(method, path, params, body, headers).body
        end

        alias_method :exists_index_template?, :exists_index_template
        # Register this action with its valid params when the module is loaded.
        #
        # @since 6.2.0
        ParamsRegistry.register(:exists_index_template, [
          :flat_settings,
          :master_timeout,
          :local
        ].freeze)
      end
    end
  end
end
