module Cardflex
  class Configuration
    API_VERSION = 2
    SERVER = "secure.cardflexonline.com"
    PORT = 443

    class << self
      attr_writer :logger, :api_key
      attr_accessor :username, :password
    end

    attr_reader :api_key, :username, :password

    def self.expectant_reader(*attributes)
      attributes.each do |attribute|
        (class << self; self; end).send(:define_method, attribute) do
          value = instance_variable_get("@#{attribute}")
          raise ConfigurationError.new(attribute.to_s, "needs to be set") unless value
          value
        end
      end
    end
    expectant_reader :api_key, :environment

    def initialize(options={})
      [:environment, :api_key, :username, :password, :logger].each do |attr|
        instance_variable_set("@#{attr}", options[attr])
      end
    end

    def self.environment=(env)
      unless [:development, :test, :production].include?(env)
        raise ArgumentError, "#{env} is not a valid environment"
      end

      @environment = env
    end

    def self.gateway
      Cardflex::Gateway.new(instantiate)
    end

    def self.instantiate
      config = new(
        :environment => @environment,
        :logger => logger,
        :username => username,
        :password => password,
        :api_key => api_key
      )
    end

    def ca_file
      File.expand_path(File.join(File.dirname(__FILE__), "..", "ssl", "ca-certificates.ca.crt"))
    end

    def http
      Http.new(self)
    end

    def three_step_path
      "/api/v2/three-step"
    end

    def query_path
      "/api/query.php"
    end

    def server
      SERVER
    end

    def protocol
      "https"
    end

    def port
      PORT
    end

    def ssl?
      true
    end

    def api_version
      API_VERSION
    end

    def logger
      @logger ||= self.class._default_logger
    end

    def self.logger
      @logger ||= _default_logger
    end

    def self._default_logger
      logger = Logger.new(STDOUT)
      logger.level = Logger::INFO
      logger
    end
  end
end