# encoding: utf-8

require 'pio/dhcp/frame'
require 'forwardable'

module Pio
  class Dhcp
    # Base class of Dhcp Packet Generator and Parser.
    class Message
      extend Forwardable

      def_delegators :@frame, :destination_mac
      def_delegators :@frame, :source_mac
      def_delegators :@frame, :ether_type
      def_delegators :@frame, :ip_version
      def_delegators :@frame, :ip_header_length
      def_delegators :@frame, :ip_type_of_service
      def_delegators :@frame, :ip_total_length
      def_delegators :@frame, :ip_identifier
      def_delegators :@frame, :ip_flag
      def_delegators :@frame, :ip_fragment
      def_delegators :@frame, :ip_ttl
      def_delegators :@frame, :ip_protocol
      def_delegators :@frame, :ip_header_checksum
      def_delegators :@frame, :ip_source_address
      def_delegators :@frame, :ip_destination_address
      def_delegators :@frame, :udp_src_port
      def_delegators :@frame, :udp_dst_port
      def_delegators :@frame, :udp_length
      def_delegators :@frame, :udp_checksum
      def_delegators :@frame, :dhcp
      def_delegators :@frame, :optioal_tlvs
      def_delegators :@frame, :boot_message_type
      def_delegators :@frame, :message_type
      def_delegators :@frame, :hw_addr_type
      def_delegators :@frame, :hw_addr_len
      def_delegators :@frame, :hops
      def_delegators :@frame, :transaction_id
      def_delegators :@frame, :seconds
      def_delegators :@frame, :bootp_flags
      def_delegators :@frame, :client_ip_address
      def_delegators :@frame, :your_ip_address
      def_delegators :@frame, :next_server_ip_address
      def_delegators :@frame, :relay_agent_ip_address
      def_delegators :@frame, :client_mac_address
      def_delegators :@frame, :server_host_name
      def_delegators :@frame, :boot_file_name
      def_delegators :@frame, :server_identifier
      def_delegators :@frame, :renewal_time_value
      def_delegators :@frame, :rebinding_time_value
      def_delegators :@frame, :ip_address_lease_time
      def_delegators :@frame, :subnet_mask
      def_delegators :@frame, :client_identifier
      def_delegators :@frame, :requested_ip_address
      def_delegators :@frame, :parameters_list
      def_delegators :@frame, :to_binary

      def self.create_from(frame)
        message = allocate
        message.instance_variable_set :@frame, frame
        message
      end

      def initialize(user_options)
        type_merged_options = user_options.merge type: const_type
        options = options_klass.new(type_merged_options)
        @frame = Dhcp::Frame.new(options.to_hash)
      end

      def const_type
        self.class::TYPE
      end

      def options_klass
        self.class.const_get(:Options)
      end
    end
  end
end