# Licensed to Elasticsearch B.V under one or more agreements.
# Elasticsearch B.V licenses this file to you under the Apache 2.0 License.
# See the LICENSE file in the project root for more information

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/7.7/indices-exists.html
        #
        def exists(arguments = {})
          raise ArgumentError, "Required argument 'index' missing" unless arguments[:index]

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

          arguments = arguments.clone

          _index = arguments.delete(:index)

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

          body = nil

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

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