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# license agreements. See the NOTICE file distributed with
# this work for additional information regarding copyright
# ownership. Elasticsearch B.V. licenses this file to you under
# 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 exists.
        #
        # @option arguments [List] :index A comma-separated list of index names
        # @option arguments [Boolean] :local Return local information, do not retrieve the state from master node (default: false)
        # @option arguments [Boolean] :ignore_unavailable Ignore unavailable indexes (default: false)
        # @option arguments [Boolean] :allow_no_indices Ignore if a wildcard expression resolves to no concrete indices (default: false)
        # @option arguments [String] :expand_wildcards Whether wildcard expressions should get expanded to open or closed indices (default: open) (options: open, closed, hidden, none, all)
        # @option arguments [Boolean] :flat_settings Return settings in flat format (default: false)
        # @option arguments [Boolean] :include_defaults Whether to return all default setting for each of the indices.
        # @option arguments [Hash] :headers Custom HTTP headers
        #
        # @see https://www.elastic.co/guide/en/elasticsearch/reference/master/indices-exists.html
        #
        def exists(arguments = {})
          raise ArgumentError, "Required argument 'index' missing" unless arguments[:index]

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

          body   = nil

          _index = arguments.delete(:index)

          method = Elasticsearch::API::HTTP_HEAD
          path   = "#{Utils.__listify(_index)}"
          params = Utils.process_params(arguments)

          Utils.__rescue_from_not_found do
            perform_request(method, path, params, body, headers).status == 200 ? true : false
          end
        end

        alias_method :exists?, :exists
      end
    end
  end
end