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# 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's `_source`.
      #
      # The response contains just the original document, as passed to Elasticsearch during indexing.
      #
      # @example Get a document `_source`
      #
      #     client.get_source 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; deprecated and optional starting with 7.0
      # @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 [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/
      #
      # @since 0.90.1
      #
      def get_source(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

        if arguments[:type]
          path   = Utils.__pathify Utils.__escape(arguments[:index]),
                                   Utils.__escape(arguments[:type]),
                                   Utils.__escape(arguments[:id]),
                                   '_source'
        else
          path   = Utils.__pathify Utils.__escape(arguments[:index]),
                                   '_source',
                                   Utils.__escape(arguments[:id])
        end


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

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

        perform_request(method, path, params, body).body
      end

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