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# the Apache License, Version 2.0 (the "License"); you may
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#   http://www.apache.org/licenses/LICENSE-2.0
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# under the License.

module Elasticsearch
  module API
    module Actions
      # Performs an update on every document in the index without changing the source,
      # for example to pick up a mapping change.
      #
      # @option arguments [List] :index A comma-separated list of index names to search; use `_all` or empty string to perform the operation on all indices
      # @option arguments [String] :analyzer The analyzer to use for the query string
      # @option arguments [Boolean] :analyze_wildcard Specify whether wildcard and prefix queries should be analyzed (default: false)
      # @option arguments [String] :default_operator The default operator for query string query (AND or OR) (options: AND, OR)
      # @option arguments [String] :df The field to use as default where no field prefix is given in the query string
      # @option arguments [Number] :from Starting offset (default: 0)
      # @option arguments [Boolean] :ignore_unavailable Whether specified concrete indices should be ignored when unavailable (missing or closed)
      # @option arguments [Boolean] :allow_no_indices Whether to ignore if a wildcard indices expression resolves into no concrete indices. (This includes `_all` string or when no indices have been specified)
      # @option arguments [String] :conflicts What to do when the update by query hits version conflicts? (options: abort, proceed)
      # @option arguments [String] :expand_wildcards Whether to expand wildcard expression to concrete indices that are open, closed or both. (options: open, closed, hidden, none, all)
      # @option arguments [Boolean] :lenient Specify whether format-based query failures (such as providing text to a numeric field) should be ignored
      # @option arguments [String] :pipeline Ingest pipeline to set on index requests made by this action. (default: none)
      # @option arguments [String] :preference Specify the node or shard the operation should be performed on (default: random)
      # @option arguments [String] :q Query in the Lucene query string syntax
      # @option arguments [List] :routing A comma-separated list of specific routing values
      # @option arguments [Time] :scroll Specify how long a consistent view of the index should be maintained for scrolled search
      # @option arguments [String] :search_type Search operation type (options: query_then_fetch, dfs_query_then_fetch)
      # @option arguments [Time] :search_timeout Explicit timeout for each search request. Defaults to no timeout.
      # @option arguments [Number] :max_docs Maximum number of documents to process (default: all documents)
      # @option arguments [List] :sort A comma-separated list of <field>:<direction> pairs
      # @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] :terminate_after The maximum number of documents to collect for each shard, upon reaching which the query execution will terminate early.
      # @option arguments [List] :stats Specific 'tag' of the request for logging and statistical purposes
      # @option arguments [Boolean] :version Specify whether to return document version as part of a hit
      # @option arguments [Boolean] :version_type Should the document increment the version number (internal) on hit or not (reindex)
      # @option arguments [Boolean] :request_cache Specify if request cache should be used for this request or not, defaults to index level setting
      # @option arguments [Boolean] :refresh Should the affected indexes be refreshed?
      # @option arguments [Time] :timeout Time each individual bulk request should wait for shards that are unavailable.
      # @option arguments [String] :wait_for_active_shards Sets the number of shard copies that must be active before proceeding with the update by query operation. Defaults to 1, meaning the primary shard only. Set to `all` for all shard copies, otherwise set to any non-negative value less than or equal to the total number of copies for the shard (number of replicas + 1)
      # @option arguments [Number] :scroll_size Size on the scroll request powering the update by query
      # @option arguments [Boolean] :wait_for_completion Should the request should block until the update by query operation is complete.
      # @option arguments [Number] :requests_per_second The throttle to set on this request in sub-requests per second. -1 means no throttle.
      # @option arguments [Number|string] :slices The number of slices this task should be divided into. Defaults to 1, meaning the task isn't sliced into subtasks. Can be set to `auto`.
      # @option arguments [Hash] :headers Custom HTTP headers
      # @option arguments [Hash] :body The search definition using the Query DSL
      #
      # @see https://www.elastic.co/guide/en/elasticsearch/reference/master/docs-update-by-query.html
      #
      def update_by_query(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)

        method = Elasticsearch::API::HTTP_POST
        path   = "#{Utils.__listify(_index)}/_update_by_query"
        params = Utils.process_params(arguments)

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