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# 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
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# specific language governing permissions and limitations
# under the License.

module Elasticsearch
  module API
    module Actions
      # Returns information about why a specific matches (or doesn't match) a query.
      #
      # @option arguments [String] :id The document ID
      # @option arguments [String] :index The name of the index
      # @option arguments [Boolean] :analyze_wildcard Specify whether wildcards and prefix queries in the query string query should be analyzed (default: false)
      # @option arguments [String] :analyzer The analyzer for the query string query
      # @option arguments [String] :default_operator The default operator for query string query (AND or OR) (options: AND, OR)
      # @option arguments [String] :df The default field for query string query (default: _all)
      # @option arguments [List] :stored_fields A comma-separated list of stored fields to return in the response
      # @option arguments [Boolean] :lenient Specify whether format-based query failures (such as providing text to a numeric field) should be ignored
      # @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 [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 [Hash] :headers Custom HTTP headers
      # @option arguments [Hash] :body The query definition using the Query DSL
      #
      # @see https://www.elastic.co/guide/en/elasticsearch/reference/8.1/search-explain.html
      #
      def explain(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 = arguments.delete(:body)

        _id = arguments.delete(:id)

        _index = arguments.delete(:index)

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

        path   = "#{Utils.__listify(_index)}/_explain/#{Utils.__listify(_id)}"
        params = Utils.process_params(arguments)

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