# Copyright (C) 2014-2015 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 Operation
    module Write

      module LegacyBulkMergable

        # Aggregate the write errors returned from this result.
        #
        # @example Aggregate the write errors.
        #   result.aggregate_write_errors([0, 1, 2, 3])
        #
        # @param [ Array ] indexes The indexes of each operation as they
        #   were listed in the Bulk API.
        #
        # @return [ Array ] The aggregate write errors.
        #
        # @since 2.0.0
        def aggregate_write_errors(indexes)
          @replies.each_with_index.reduce(nil) do |errors, (reply, i)|
            if reply_write_errors?(reply)
              errors ||= []
              errors << { 'errmsg' => reply.documents.first[Error::ERROR],
                          'index' => indexes[i],
                          'code' => reply.documents.first[Error::CODE] }
            end
            errors
          end
        end

        # Aggregate the write concern errors returned from this result.
        #
        # @example Aggregate the write concern errors.
        #   result.aggregate_write_concern_errors([0, 1, 2, 3])
        #
        # @param [ Array ] indexes The indexes of each operation as they
        #   were listed in the Bulk API.
        #
        # @return [ Array ] The aggregate write concern errors.
        #
        # @since 2.0.0
        def aggregate_write_concern_errors(indexes)
          @replies.each_with_index.reduce(nil) do |errors, (reply, i)|
            if error = reply_write_errors?(reply)
              errors ||= []
              if note = reply.documents.first['wnote'] || reply.documents.first['jnote']
                code = reply.documents.first['code'] || Error::BAD_VALUE
                error_string = "#{code}: #{note}"
              elsif error == 'timeout'
                code = reply.documents.first['code'] || Error::UNKNOWN_ERROR
                error_string = "#{code}: #{error}"
              end
              errors << { 'errmsg' => error_string,
                          'index' => indexes[i],
                          'code' => code } if error_string
            end
            errors
          end
        end

        private

        def reply_write_errors?(reply)
          reply.documents.first[Error::ERROR] ||
            reply.documents.first[Error::ERRMSG]
        end
      end
    end
  end
end