# frozen_string_literal: true

# Copyright (C) 2015-2020 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.

require 'mongo/write_concern/base'
require 'mongo/write_concern/acknowledged'
require 'mongo/write_concern/unacknowledged'

module Mongo
  # Base module for all write concern specific behavior.
  #
  # @since 2.0.0
  module WriteConcern
    extend self

    # The number of servers write concern.
    #
    # @since 2.0.0
    # @deprecated
    W = :w

    # The journal write concern.
    #
    # @since 2.0.0
    # @deprecated
    J = :j

    # The file sync write concern.
    #
    # @since 2.0.0
    # @deprecated
    FSYNC = :fsync

    # The wtimeout write concern.
    #
    # @since 2.0.0
    # @deprecated
    WTIMEOUT = :wtimeout

    # The GLE command name.
    #
    # @since 2.0.0
    # @deprecated
    GET_LAST_ERROR = :getlasterror

    # The default write concern is to acknowledge on a single server.
    #
    # @since 2.0.0
    DEFAULT = {}.freeze

    # Create a write concern object for the provided options.
    #
    # If options are nil, returns nil.
    #
    # @example Get a write concern.
    #   Mongo::WriteConcern.get(:w => 1)
    #
    # @param [ Hash ] options The options to instantiate with.
    #
    # @option options :w [ Integer, String ] The number of servers or the
    #   custom mode to acknowledge.
    # @option options :j [ true, false ] Whether to acknowledge a write to
    #   the journal.
    # @option options :fsync [ true, false ] Should the write be synced to
    #   disk.
    # @option options :wtimeout [ Integer ] The number of milliseconds to
    #   wait for acknowledgement before raising an error.
    #
    # @return [ nil | Unacknowledged | Acknowledged ] The appropriate concern.
    #
    # @raise [ Error::InvalidWriteConcern ] If the options are invalid.
    #
    # @since 2.0.0
    def get(options)
      return options if options.is_a?(Base)

      return unless options

      if (options[:w] || options['w']) == 0
        Unacknowledged.new(options)
      else
        Acknowledged.new(options)
      end
    end
  end
end
