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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

      # Return a specified document.
      #
      # The response contains full document, as stored in Elasticsearch, incl. `_source`, `_version`, etc.
      #
      # @example Get a document
      #
      #     client.get index: 'myindex', type: 'mytype', id: '1'
      #
      # @option arguments [String] :id The document ID (*Required*)
      # @option arguments [String] :index The name of the index (*Required*)
      # @option arguments [String] :type The type of the document (use `_all` to fetch the first document matching the ID across all types)
      # @option arguments [List] :stored_fields A comma-separated list of stored fields to return in the response
      # @option arguments [String] :parent The ID of the parent document
      # @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 [List] :_source_exclude A list of fields to exclude from the returned _source field
      # @option arguments [List] :_source_include 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, force)
      #
      # @see http://elasticsearch.org/guide/reference/api/get/
      #
      def get(arguments={})
        raise ArgumentError, "Required argument 'index' missing" unless arguments[:index]
        raise ArgumentError, "Required argument 'id' missing"    unless arguments[:id]
        arguments[:type] ||= DEFAULT_DOC

        method = HTTP_GET
        path   = Utils.__pathify Utils.__escape(arguments[:index]),
                                 Utils.__escape(arguments[:type]),
                                 Utils.__escape(arguments[:id])

        params = Utils.__validate_and_extract_params arguments, ParamsRegistry.get(__method__)
        body   = nil

        params[:fields] = Utils.__listify(params[:fields]) if params[:fields]

        if Array(arguments[:ignore]).include?(404)
          Utils.__rescue_from_not_found { perform_request(method, path, params, body).body }
        else
          perform_request(method, path, params, body).body
        end
      end

      # Register this action with its valid params when the module is loaded.
      #
      # @since 6.1.1
      ParamsRegistry.register(:get, [
          :stored_fields,
          :parent,
          :preference,
          :realtime,
          :refresh,
          :routing,
          :_source,
          :_source_excludes,
          :_source_includes,
          :_source_exclude,
          :_source_include,
          :version,
          :version_type ].freeze)
    end
  end
end
