# frozen_string_literal: true

# Copyright (C) 2019-2020 MongoDB Inc.
#
# Licensed 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 Mongo
  module Crypt
    # A Context object initialized for explicit decryption
    #
    # @api private
    class ExplicitDecryptionContext < Context
      # Create a new ExplicitDecryptionContext object
      #
      # @param [ Mongo::Crypt::Handle ] mongocrypt a Handle that
      #   wraps a mongocrypt_t object used to create a new mongocrypt_ctx_t
      # @param [ ClientEncryption::IO ] io A instance of the IO class
      #   that implements driver I/O methods required to run the
      #   state machine
      # @param [ BSON::Document ] doc A document to decrypt
      def initialize(mongocrypt, io, doc)
        super(mongocrypt, io)

        # Initialize the underlying mongocrypt_ctx_t object to perform
        # explicit decryption
        Binding.ctx_explicit_decrypt_init(self, doc)
      end

      # Which BSON mode to use when creating documents from the outcome of
      # the state machine. The returned value is based on the
      # +Mongo::Config.csfle_convert_to_ruby_types+ option.
      #
      # @return [ Symbol, nil ] The BSON mode.
      def bson_mode
        Mongo::Config.csfle_convert_to_ruby_types ? nil : :bson
      end
    end
  end
end
