module Fog
  module AWS
    # @api private
    #
    # This is a temporary lookup helper for extracting into external module.
    #
    # Cleaner provider/service registration will replace this code.
    #
    class ServiceMapper
      def self.class_for(key)
        case key
        when :auto_scaling
          Fog::AWS::AutoScaling
        when :beanstalk
          Fog::AWS::ElasticBeanstalk
        when :cdn
          Fog::CDN::AWS
        when :cloud_formation
          Fog::AWS::CloudFormation
        when :cloud_watch
          Fog::AWS::CloudWatch
        when :compute
          Fog::Compute::AWS
        when :data_pipeline
          Fog::AWS::DataPipeline
        when :ddb, :dynamodb
          Fog::AWS::DynamoDB
        when :dns
          Fog::DNS::AWS
        when :elasticache
          Fog::AWS::Elasticache
        when :elb
          Fog::AWS::ELB
        when :emr
          Fog::AWS::EMR
        when :glacier
          Fog::AWS::Glacier
        when :iam
          Fog::AWS::IAM
        when :redshift
          Fog::AWS::Redshift
        when :sdb, :simpledb
          Fog::AWS::SimpleDB
        when :ses
          Fog::AWS::SES
        when :sqs
          Fog::AWS::SQS
        when :eu_storage, :storage
          Fog::AWS::Storage
        when :rds
          Fog::AWS::RDS
        when :sns
          Fog::AWS::SNS
        when :sts
          Fog::AWS::STS
        else
          # @todo Replace most instances of ArgumentError with NotImplementedError
          # @todo For a list of widely supported Exceptions, see:
          # => http://www.zenspider.com/Languages/Ruby/QuickRef.html#35
          raise ArgumentError, "Unsupported #{self} service: #{key}"
        end
      end

      def self.[](service)
        @@connections ||= Hash.new do |hash, key|
          hash[key] = case key
                      when :auto_scaling
                        Fog::AWS::AutoScaling.new
                      when :beanstalk
                        Fog::AWS::ElasticBeanstalk.new
                      when :cdn
                        Fog::Logger.warning("AWS[:cdn] is not recommended, use CDN[:aws] for portability")
                        Fog::CDN.new(:provider => 'AWS')
                      when :cloud_formation
                        Fog::AWS::CloudFormation.new
                      when :cloud_watch
                        Fog::AWS::CloudWatch.new
                      when :compute
                        Fog::Logger.warning("AWS[:compute] is not recommended, use Compute[:aws] for portability")
                        Fog::Compute.new(:provider => 'AWS')
                      when :data_pipeline
                        Fog::AWS::DataPipeline.new
                      when :ddb, :dynamodb
                        Fog::AWS::DynamoDB.new
                      when :dns
                        Fog::Logger.warning("AWS[:dns] is not recommended, use DNS[:aws] for portability")
                        Fog::DNS.new(:provider => 'AWS')
                      when :elasticache
                        Fog::AWS::Elasticache.new
                      when :elb
                        Fog::AWS::ELB.new
                      when :emr
                        Fog::AWS::EMR.new
                      when :glacier
                        Fog::AWS::Glacier.new
                      when :iam
                        Fog::AWS::IAM.new
                      when :redshift
                        Fog::AWS::Redshift.new
                      when :rds
                        Fog::AWS::RDS.new
                      when :eu_storage
                        Fog::Storage.new(:provider => 'AWS', :region => 'eu-west-1')
                      when :sdb, :simpledb
                        Fog::AWS::SimpleDB.new
                      when :ses
                        Fog::AWS::SES.new
                      when :sqs
                        Fog::AWS::SQS.new
                      when :storage
                        Fog::Logger.warning("AWS[:storage] is not recommended, use Storage[:aws] for portability")
                        Fog::Storage.new(:provider => 'AWS')
                      when :sns
                        Fog::AWS::SNS.new
                      when :sts
                        Fog::AWS::STS.new
                      else
                        raise ArgumentError, "Unrecognized service: #{key.inspect}"
                      end
        end
        @@connections[service]
      end

      def self.services
        Fog::AWS.services
      end
    end
  end
end
