# Licensed to Elasticsearch B.V. under one or more contributor
# 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.

# frozen_string_literal: true

module ElasticAPM
  # @api private
  module Spies
    # @api private
    class ElasticsearchSpy
      NAME_FORMAT = '%s %s'
      TYPE = 'db'
      SUBTYPE = 'elasticsearch'

      def self.sanitizer
        @sanitizer ||=
          begin
            config = ElasticAPM.agent.config
            ElasticAPM::Transport::Filters::HashSanitizer.new(
              key_patterns: config.custom_key_filters +
                            config.sanitize_field_names
            )
          end
      end

      # @api private
      module Ext
        def perform_request(method, path, *args, &block)
          unless ElasticAPM.current_transaction
            return super(method, path, *args, &block)
          end

          name = format(NAME_FORMAT, method, path)
          statement = []

          statement << { params: args&.[](0) }

          if ElasticAPM.agent.config.capture_elasticsearch_queries
            unless args[1].nil? || args[1].empty?
              body =
                ElasticAPM::Spies::ElasticsearchSpy
                .sanitizer.strip_from(args[1])
              statement << { body: body }
            end
          end

          context = Span::Context.new(
            db: { statement: statement.reduce({}, :merge).to_json },
            destination: {
              service: {
                name: SUBTYPE,
                resource: SUBTYPE,
                type: TYPE
              }
            }
          )

          ElasticAPM.with_span(
            name,
            TYPE,
            subtype: SUBTYPE,
            context: context
          ) { super(method, path, *args, &block) }
        end
      end

      def install
        if defined?(::Elastic::Transport::Client)
          ::Elastic::Transport::Client.prepend(Ext)
        elsif defined?(::Elasticsearch::Transport::Client)
          ::Elasticsearch::Transport::Client.prepend(Ext)
        end
      end
    end

    register(
      'Elasticsearch::Transport::Client',
      'elasticsearch-transport',
      ElasticsearchSpy.new
    )

    register(
      'Elastic::Transport::Client',
      'elastic-transport',
      ElasticsearchSpy.new
    )
  end
end