#!/usr/bin/env ruby

require 'socket'

require_relative 'lib/string'
require_relative 'lib/array'
require_relative 'lib/bytes'
require_relative 'lib/network'
require_relative 'lib/packet'
require_relative 'lib/chunk'
require_relative 'lib/server_info'

class TwClient
  attr_reader :state

  def initialize
    @client_token = MY_TOKEN.map { |b| b.to_s(16) }.join('')
    puts "client token #{@client_token}"
    @s = UDPSocket.new
    @state = NET_CONNSTATE_OFFLINE
    @ip = 'localhost'
    @port = 8303
    @packet_flags = {}
    @ticks = 0
  end

  def send_msg(data)
    # size and flags
    header = [0x00, 0x00, 0x01] + str_bytes(@token)
    msg = header + data
    @s.send(msg.pack('C*'), 0, @ip, @port)
  end

  # does not help because server
  # drops the invalid acks
  # so we have to finally
  # create a proper
  # sendpacket() method
  # that sends a proper header
  def send_ctrl_keepalive()
    # size and flags
    header = [0x04, 0x0A, 0x00] + str_bytes(@token)
    msg = header + [NET_CTRLMSG_KEEPALIVE]
    @s.send(msg.pack('C*'), 0, @ip, @port)
  end

  def send_msg_connect()
    header = [0x04, 0x00, 0x00] + str_bytes(@token)
    msg = header + [NET_CTRLMSG_CONNECT] + str_bytes(@client_token) + Array.new(501, 0x00)
    @s.send(msg.pack('C*'), 0, @ip, @port)
  end

  def send_ctrl_with_token()
    @state = NET_CONNSTATE_TOKEN
    @s.send(MSG_TOKEN.pack('C*'), 0, @ip, @port)
  end

  def send_info()
    send_msg(MSG_INFO)
  end

  def send_msg_startinfo()
    header = [0x00, 0x04, 0x01] + str_bytes(@token)
    msg = header + MSG_STARTINFO
    @s.send(msg.pack('C*'), 0, @ip, @port)
  end

  def send_msg_ready()
    header = [0x00, 0x01, 0x01] + str_bytes(@token)
    msg = header + [0x40, 0x01, 0x02, 0x25]
    @s.send(msg.pack('C*'), 0, @ip, @port)
  end

  def send_enter_game()
    header = [0x00, 0x07, 0x01] + str_bytes(@token)
    msg = header + [0x40, 0x01, 0x04, 0x27]
    @s.send(msg.pack('C*'), 0, @ip, @port)
  end

  def send_input
    header = [0x10, 0x0A, 01] + str_bytes(@token)
    random_compressed_input = [
      0x4D, 0xE9, 0x48, 0x13, 0xD0, 0x0B, 0x6B, 0xFC, 0xB7, 0x2B, 0x6E, 0x00, 0xBA
    ]
    # this wont work we need to ack the ticks
    # and then compress it
    # CMsgPacker Msg(NETMSG_INPUT, true);
    # Msg.AddInt(m_AckGameTick);
    # Msg.AddInt(m_PredTick);
    # Msg.AddInt(Size);
    msg = header + random_compressed_input
    @s.send(msg.pack('C*'), 0, @ip, @port)
  end

  def on_msg_token(data)
      @token = bytes_to_str(data)
      puts "Got token #{@token}"
      send_msg_connect()
  end

  def on_msg_accept
    puts "got accept. connection online"
    @state = NET_CONNSTATE_ONLINE
    send_info
  end

  def on_msg_close
    puts "got NET_CTRLMSG_CLOSE"
  end

  def get_strings(data)
    strings = []
    str = ""
    data.chars.each do |b|
      # use a bunch of control characters as delimiters
      # https://en.wikipedia.org/wiki/Control_character
      if (0x00..0x0F).to_a.include?(b.unpack('C*').first)
        strings.push(str) unless str.length.zero?
        str = ""
        next
      end

      str += b
    end
    strings
  end

  def on_msg_map_change(data)
    mapname = get_strings(data).first
    puts "map: #{mapname}"
    send_msg_ready()
  end

  def connect(ip, port)
    @ip = ip
    @port = port
    puts "connecting to #{@ip}:#{@port} .."
    @s.connect(ip, port)
    send_ctrl_with_token
    loop do
      tick
    end
  end

  def on_motd(data)
    puts "motd: #{get_strings(data)}"
  end

  def on_playerinfo(data)
    puts "playerinfo: #{get_strings(data).join(', ')}"
  end

  # CClient::ProcessConnlessPacket
  def on_ctrl_message(msg, data)
    case msg
    when NET_CTRLMSG_TOKEN then on_msg_token(data)
    when NET_CTRLMSG_ACCEPT then on_msg_accept
    when NET_CTRLMSG_CLOSE then on_msg_close
    else
        puts "Uknown control message #{msg}"
        exit(1)
    end
  end

  def process_chunk(chunk)
    if !chunk.sys
      puts "todo non sys chunks. skipped msg: #{chunk.msg}"
      return
    end
    puts "proccess chunk with msg: #{chunk.msg}"
    case chunk.msg
    when NETMSG_MAP_CHANGE
      send_msg_ready
    when NETMSG_CON_READY
      send_msg_startinfo
    else
      puts "Unsupported system msg: #{chunk.msg}"
      exit(1)
    end
  end

  def process_server_packet(data)
    chunks = BigChungusTheChunkGetter.get_chunks(data)
    chunks.each do |chunk|
      process_chunk(chunk)
    end
  end

  def tick
    # puts "tick"
    begin
      pck = @s.recvfrom_nonblock(1400)
    rescue
      pck = nil
    end
    return unless pck

    data = pck.first

    packet = Packet.new(data)
    puts packet.to_s

    # process connless packets data
    if packet.flags_control
      msg = data[PACKET_HEADER_SIZE].unpack("C*").first
      on_ctrl_message(msg, data[(PACKET_HEADER_SIZE + 1)..])
    else # process non-connless packets
      process_server_packet(packet.payload)
    end

    @ticks += 1
    if @ticks % 10 == 0
      send_ctrl_keepalive
    end
  end

  def disconnect
    @s.close
  end
end

client = TwClient.new

client.connect(ARGV[0] || "localhost", ARGV[1] ? ARGV[1].to_i : 8303)