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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 Actions
      # Returns information about whether a document exists in an index.
      #
      # @option arguments [String] :id The document ID
      # @option arguments [String] :index The name of the index
      # @option arguments [List] :stored_fields A comma-separated list of stored fields to return in the response
      # @option arguments [String] :preference Specify the node or shard the operation should be performed on (default: random)
      # @option arguments [Boolean] :realtime Specify whether to perform the operation in realtime or search mode
      # @option arguments [Boolean] :refresh Refresh the shard containing the document before performing the operation
      # @option arguments [String] :routing Specific routing value
      # @option arguments [List] :_source True or false to return the _source field or not, or a list of fields to return
      # @option arguments [List] :_source_excludes A list of fields to exclude from the returned _source field
      # @option arguments [List] :_source_includes A list of fields to extract and return from the _source field
      # @option arguments [Number] :version Explicit version number for concurrency control
      # @option arguments [String] :version_type Specific version type (options: internal, external, external_gte)
      # @option arguments [Hash] :headers Custom HTTP headers
      #
      # @see https://www.elastic.co/guide/en/elasticsearch/reference/master/docs-get.html
      #
      def exists(arguments = {})
        raise ArgumentError, "Required argument 'index' missing" unless arguments[:index]
        raise ArgumentError, "Required argument 'id' missing" unless arguments[:id]

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

        body = nil

        _id = arguments.delete(:id)

        _index = arguments.delete(:index)

        method = Elasticsearch::API::HTTP_HEAD
        path   = "#{Utils.__listify(_index)}/_doc/#{Utils.__listify(_id)}"
        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
