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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 and statistics about terms in the fields of a particular document.
      #
      # @option arguments [String] :index The index in which the document resides.
      # @option arguments [String] :id The id of the document, when not specified a doc param should be supplied.
      # @option arguments [Boolean] :term_statistics Specifies if total term frequency and document frequency should be returned.
      # @option arguments [Boolean] :field_statistics Specifies if document count, sum of document frequencies and sum of total term frequencies should be returned.
      # @option arguments [List] :fields A comma-separated list of fields to return.
      # @option arguments [Boolean] :offsets Specifies if term offsets should be returned.
      # @option arguments [Boolean] :positions Specifies if term positions should be returned.
      # @option arguments [Boolean] :payloads Specifies if term payloads should be returned.
      # @option arguments [String] :preference Specify the node or shard the operation should be performed on (default: random).
      # @option arguments [String] :routing Specific routing value.
      # @option arguments [Boolean] :realtime Specifies if request is real-time as opposed to near-real-time (default: true).
      # @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
      # @option arguments [Hash] :body Define parameters and or supply a document to get termvectors for. See documentation.
      #
      # @see https://www.elastic.co/guide/en/elasticsearch/reference/master/docs-termvectors.html
      #
      def termvectors(arguments = {})
        raise ArgumentError, "Required argument 'index' missing" unless arguments[:index]

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

        body = arguments.delete(:body)

        arguments = arguments.clone

        _index = arguments.delete(:index)

        _id = arguments.delete(:id)

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

        endpoint = arguments.delete(:endpoint) || '_termvectors'
        path   = if _index && _id
                   "#{Utils.__listify(_index)}/_termvectors/#{Utils.__listify(_id)}"
                 else
                   "#{Utils.__listify(_index)}/_termvectors"
                 end
        params = Utils.process_params(arguments)

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

      # Deprecated: Use the plural version, {#termvectors}
      #
      def termvector(arguments = {})
        termvectors(arguments.merge endpoint: '_termvector')
      end
    end
  end
end