rubocop fixes

No errors in client log but still in connecting screen

client_sample.rb

@@ -78,7 +78,13 @@ end
 
 Signal.trap('INT') do
   client.disconnect
+  exit
 end
 
 # connect and detach thread
-client.connect(args[:ip], args[:port], detach: false)
+client.connect(args[:ip], args[:port], detach: true)
+
+loop do
+  msg = $stdin.gets.chomp
+  client.send_chat(msg)
+end

lib/chunk.rb

@@ -13,13 +13,14 @@ require_relative 'bytes'
 #
 # https://chillerdragon.github.io/teeworlds-protocol/07/packet_layout.html
 class NetChunk
-  attr_reader :next, :data, :msg, :sys, :flags, :header_raw, :full_raw
+  attr_reader :next, :data, :msg, :sys, :flags, :seq, :header_raw, :full_raw
 
   @@sent_vital_chunks = 0
 
   def initialize(data)
     @next = nil
     @flags = {}
+    @seq = 0
     @size = 0
     parse_header(data[0..2])
     header_size = if flags_vital
@@ -135,8 +136,12 @@ class NetChunk
     size_bytes.map! { |b| b[2..].join }
     @size = size_bytes.join.to_i(2)
 
-    # sequence number
+    if @flags[:vital]
-    # in da third byte but who needs seq?!
+      data = data[0..2].bytes
+      @seq = (data[1] & (0xC0 << 2)) | data[2]
+    else
+      @seq = 0
+    end
   end
 
   # @return [Boolean]

lib/config.rb

@@ -3,11 +3,12 @@
 class Config
   def initialize(options = {})
     filepath = options[:file] || 'autoexec.cfg'
+    @type = options[:type] || :client
     init_configs
     load_cfg(filepath)
   end
 
-  def init_configs
+  def init_client_configs
     @configs = {
       password: { help: 'Password to the server', default: '' }
     }
@@ -15,6 +16,23 @@ class Config
       echo: { help: 'Echo the text', callback: proc { |arg| puts arg } },
       quit: { help: 'Quit', callback: proc { |_| exit } }
     }
+  end
+
+  def init_server_configs
+    @configs = {
+      sv_map: { help: 'map', default: 'dm1' }
+    }
+    @commands = {
+      shutdown: { help: 'shutdown server', callback: proc { |_| exit } }
+    }
+  end
+
+  def init_configs
+    if @type == :client
+      init_client_configs
+    else
+      init_server_configs
+    end
     @configs.each do |cfg, data|
       self.class.send(:attr_accessor, cfg)
       instance_variable_set("@#{cfg}", data[:default])

lib/connection.rb

@@ -0,0 +1,20 @@
+# frozen_string_literal: true
+
+##
+# Only used for chunks where the sequence number does not match the expected value
+# to decide wether to drop known chunks silently or request resend if something got lost
+#
+# true - if the sequence number is already known and the chunk should be dropped
+# false - if the sequence number is off and we need to request a resend of lost chunks
+#
+# @return [Boolean]
+def seq_in_backroom?(seq, ack)
+  bottom = ack - (NET_MAX_SEQUENCE / 2)
+  if bottom.negative?
+    return true if seq <= ack
+    return true if seq >= (bottom + NET_MAX_SEQUENCE)
+  elsif seq <= ack && seq >= bottom
+    return true
+  end
+  false
+end

lib/game_server.rb

@@ -11,12 +11,15 @@ require_relative 'messages/cl_say'
 require_relative 'messages/cl_emoticon'
 require_relative 'messages/cl_info'
 require_relative 'messages/cl_input'
+require_relative 'messages/client_info'
 
 class GameServer
   attr_accessor :pred_game_tick, :ack_game_tick, :map
 
   def initialize(server)
     @server = server
+    @config = server.config
+    @map_path = nil
     @ack_game_tick = -1
     @pred_game_tick = 0
     @map = Map.new(
@@ -27,6 +30,29 @@ class GameServer
     )
   end
 
+  def load_map
+    puts "loading map '#{@config.sv_map}' ..."
+    map_path = nil
+    if File.exist? "data/#{@config.sv_map}.map"
+      map_path = "data/#{@config.sv_map}.map"
+    elsif File.exist? "data/maps/#{@config.sv_map}.map"
+      map_path = "data/maps/#{@config.sv_map}.map"
+    elsif File.exist? "maps/#{@config.sv_map}.map"
+      map_path = "maps/#{@config.sv_map}.map"
+    elsif File.exist? "#{Dir.home}/.teeworlds/maps/#{@config.sv_map}.map"
+      map_path = "#{Dir.home}/.teeworlds/maps/#{@config.sv_map}.map"
+    end
+
+    if map_path.nil?
+      puts "map not found '#{@config.sv_map}'"
+      # TODO: this should error when the feature is done
+      # exit 1
+    else
+      puts "found at #{map_path}"
+      @map_path = map_path
+    end
+  end
+
   ##
   # call_hook
   #
@@ -97,6 +123,16 @@ class GameServer
     puts msg
   end
 
+  # https://chillerdragon.github.io/teeworlds-protocol/07/game_messages.html#NETMSGTYPE_SV_CLIENTINFO
+  # send infos about currently connected clients to the newly joined client
+  # send info of the newly joined client to all currently connected clients
+  #
+  # @param client [Client] newly joined client
+  def send_client_infos(client)
+    client_info = ClientInfo.new(client_id: client.id, local: 1)
+    @server.send_client_info(client, client_info)
+  end
+
   def on_enter_game(_chunk, packet)
     # vanilla server responds to enter game with two packets
     # first:
@@ -109,6 +145,7 @@ class GameServer
 
     packet.client.in_game = true
     @server.send_server_info(packet.client, ServerInfo.new.to_a)
+    send_client_infos(packet.client)
     @server.send_game_info(packet.client, GameInfo.new.to_a)
 
     puts "'#{packet.client.player.name}' joined the game"

lib/packer.rb

@@ -55,10 +55,9 @@ class Packer
     first = "1#{sign}#{num_bits[-6..]}"
 
     num_bits = num_bits[0..-7]
-    bytes = []
+    bytes = num_bits.chars.groups_of(7).map do |seven_bits|
-    num_bits.chars.groups_of(7).each do |seven_bits|
       # mark all as extended
-      bytes << "1#{seven_bits.join.rjust(7, '0')}"
+      "1#{seven_bits.join.rjust(7, '0')}"
     end
     # least significant first
     bytes = bytes.reverse

lib/snapshot/builder.rb

@@ -2,37 +2,11 @@
 
 require_relative 'snapshot'
 
-# should be merged with SnapItemBase
-class SnapItem
-  # @param type [Integer] type of the item for example 5 is obj_flag
-  # @param id [Integer] id of said item for characters thats the ClientID
-  # @param fields [Array] array of uncompressed integers
-  #                       for example [0, 0, 1] for obj_flag
-  #                       would set
-  #                       m_X = 0
-  #                       m_Y = 0
-  #                       m_Team = 1
-  def initialize(type, id, size, fields)
-    @type = type
-    @id = id
-    @size = size
-    @fields = fields
-  end
-
-  # basically to_network
-  # tee int array that will be sent over
-  # the wire
-  def to_a
-    Packer.pack_int(@type) +
-      Packer.pack_int(@id) +
-      fields.map { |field| Packer.pack_int(field) }
-  end
-end
-
 class SnapshotBuilder
   def initialize
     @data_size = 0
     @num_items = 0
+    # @type items [Array<SnapItemBase>]
     @items = []
   end
 
@@ -41,21 +15,16 @@ class SnapshotBuilder
   #
   # https://chillerdragon.github.io/teeworlds-protocol/07/snap_items.html
   #
-  # @param type [Integer] type of the item for example 5 is obj_flag
+  # @param id [Integer] Id of the snap item. For characters that is the ClientID.
-  # @param id [Integer] id of said item for characters thats the ClientID
+  #                     Not to be confused with the type
-  # @param fields [Array] array of uncompressed integers
+  # @param item [SnapItemBase] Snap item instance. Holding type and payload.
-  #                       for example [0, 0, 1] for obj_flag
+  def new_item(id, item)
-  #                       would set
+    item.id = id
-  #                       m_X = 0
-  #                       m_Y = 0
-  #                       m_Team = 1
-  def new_item(type, id, size, fields)
-    item = SnapItem.new(type, id, size, fields)
     @items.push(item)
   end
 
   # @return [Snapshot]
   def finish
-    Snapshot.new
+    Snapshot.new(@items)
   end
 end

lib/snapshot/events/damage.rb

@@ -7,6 +7,7 @@ class NetEvent
     attr_accessor :client_id, :angle, :health_ammount, :armor_amount, :self
 
     def initialize(hash_or_raw)
+      @type = NETEVENTTYPE_DAMAGE
       @field_names = %i[
         client_id
         angle

lib/snapshot/events/death.rb

@@ -7,6 +7,7 @@ class NetEvent
     attr_accessor :client_id
 
     def initialize(hash_or_raw)
+      @type = NETEVENTTYPE_DEATH
       @field_names = %i[
         client_id
       ]

lib/snapshot/events/explosion.rb

@@ -5,6 +5,7 @@ require_relative '../snap_item_base'
 class NetEvent
   class Explosion < SnapEventBase
     def initialize(hash_or_raw)
+      @type = NETEVENTTYPE_EXPLOSION
       @field_names = []
       super
     end

lib/snapshot/events/hammer_hit.rb

@@ -5,6 +5,7 @@ require_relative '../snap_item_base'
 class NetEvent
   class HammerHit < SnapEventBase
     def initialize(hash_or_raw)
+      @type = NETEVENTTYPE_HAMMERHIT
       @field_names = []
       super
     end

lib/snapshot/events/sound_world.rb

@@ -7,6 +7,7 @@ class NetEvent
     attr_accessor :sound_id
 
     def initialize(hash_or_raw)
+      @type = NETEVENTTYPE_SOUNDWORLD
       @field_names = %i[
         sound_id
       ]

lib/snapshot/events/spawn.rb

@@ -5,6 +5,7 @@ require_relative '../snap_item_base'
 class NetEvent
   class Spawn < SnapEventBase
     def initialize(hash_or_raw)
+      @type = NETEVENTTYPE_SPAWN
       @field_names = []
       super
     end

lib/snapshot/items/character.rb

@@ -9,6 +9,7 @@ class NetObj
                   :health, :armor, :ammo_count, :weapon, :emote, :attack_tick, :triggered_events
 
     def initialize(hash_or_raw)
+      @type = NETOBJTYPE_CHARACTER
       @field_names = %i[
         tick
         x

lib/snapshot/items/client_info.rb

@@ -7,6 +7,7 @@ class NetObj
     attr_accessor :local, :team
 
     def initialize(hash_or_raw)
+      @type = NETOBJTYPE_DE_CLIENTINFO
       @field_names = %i[
         local
         team

lib/snapshot/items/flag.rb

@@ -7,6 +7,7 @@ class NetObj
     attr_accessor :x, :y, :team
 
     def initialize(hash_or_raw)
+      @type = NETOBJTYPE_FLAG
       @field_names = %i[
         x
         y

lib/snapshot/items/game_data.rb

@@ -7,6 +7,7 @@ class NetObj
     attr_accessor :game_start_tick, :game_state_flags, :game_state_end_tick
 
     def initialize(hash_or_raw)
+      @type = NETOBJTYPE_GAMEDATA
       @field_names = %i[
         game_start_tick
         game_state_flags

lib/snapshot/items/game_data_flag.rb

@@ -8,6 +8,7 @@ class NetObj
                   :flag_drop_tick_red, :flag_drop_tick_blue
 
     def initialize(hash_or_raw)
+      @type = NETOBJTYPE_GAMEDATAFLAG
       @field_names = %i[
         flag_carrier_red
         flag_carrier_blue

lib/snapshot/items/game_data_team.rb

@@ -7,6 +7,7 @@ class NetObj
     attr_accessor :teamscore_red, :teamscore_blue
 
     def initialize(hash_or_raw)
+      @type = NETOBJTYPE_GAMEDATATEAM
       @field_names = %i[
         teamscore_red
         teamscore_blue

lib/snapshot/items/laser.rb

@@ -7,6 +7,7 @@ class NetObj
     attr_accessor :x, :y, :from_x, :from_y, :start_tick
 
     def initialize(hash_or_raw)
+      @type = NETOBJTYPE_LASER
       @field_names = %i[
         x
         y

lib/snapshot/items/pickup.rb

@@ -7,6 +7,7 @@ class NetObj
     attr_accessor :x, :y, :type
 
     def initialize(hash_or_raw)
+      @type = NETOBJTYPE_PICKUP
       @field_names = %i[
         x
         y

lib/snapshot/items/player_info.rb

@@ -7,6 +7,7 @@ class NetObj
     attr_accessor :player_flags, :score, :latency
 
     def initialize(hash_or_raw)
+      @type = NETOBJTYPE_PLAYERINFO
       @field_names = %i[
         player_flags
         score

lib/snapshot/items/player_input.rb

@@ -10,6 +10,7 @@ class NetObj
                   :next_weapon, :prev_weapon
 
     def initialize(hash_or_raw)
+      @type = NETOBJTYPE_PLAYERINPUT
       @field_names = %i[
         direction
         target_x

lib/snapshot/items/projectile.rb

@@ -7,6 +7,7 @@ class NetObj
     attr_accessor :x, :y, :vel_x, :vel_y, :type, :start_tick
 
     def initialize(hash_or_raw)
+      @type = NETOBJTYPE_PROJECTILE
       @field_names = %i[
         x
         y

lib/snapshot/items/spectator_info.rb

@@ -7,6 +7,7 @@ class NetObj
     attr_accessor :spec_mode, :spectator_id, :x, :y
 
     def initialize(hash_or_raw)
+      @type = NETOBJTYPE_SPECTATORINFO
       @field_names = %i[
         spec_mode
         spectator_id

lib/snapshot/items/tune_params.rb

@@ -59,7 +59,7 @@ class NetObj
     end
 
     def init_hash(attr)
-      @fields_names.each do |name|
+      @field_names.each do |name|
         instance_variable_set("@#{name}", attr[name] || 0)
       end
     end

lib/snapshot/snap_item_base.rb

@@ -1,9 +1,11 @@
 # frozen_string_literal: true
 
 require_relative '../packer'
+require_relative '../network'
 
 class SnapItemBase
-  attr_reader :notes, :name, :id
+  attr_reader :notes, :name, :type
+  attr_accessor :id
 
   def initialize(hash_or_raw)
     @fields = @field_names.map do |_|
@@ -25,6 +27,10 @@ class SnapItemBase
     @fields.none?(&:nil?)
   end
 
+  def size
+    @fields.size
+  end
+
   def init_unpacker(u)
     @id = u.get_int
     p = u.parsed.last
@@ -56,8 +62,12 @@ class SnapItemBase
   end
 
   def init_hash(attr)
-    @fields_names.each do |name|
+    @field_names.each_with_index do |name, i|
-      instance_variable_set("@#{name}", attr[name] || 0)
+      # direct instance variables work
+      # but using the @fields array is easier to then pack
+      # idk how to iterate just the instance variables that i need on packing
+      # instance_variable_set("@#{name}", attr[name] || 0)
+      @fields[i] = attr[name] || 0
     end
   end
 
@@ -74,6 +84,8 @@ class SnapItemBase
   # int array the server sends to the client
   def to_a
     arr = []
+    arr += Packer.pack_int(@type)
+    arr += Packer.pack_int(@id)
     @fields.each do |value|
       arr += Packer.pack_int(value)
     end

lib/snapshot/snapshot.rb

@@ -7,7 +7,7 @@ class Snapshot
   def initialize(items)
     # @type game_tick [Integer]
     @game_tick = 0
-    # @type items [Array<SnapItemBase>]
+    # @type items [Array<SnapItemBase>, Array<SnapItem>]
     @items = items
   end
 

lib/snapshot/unpacker.rb

@@ -216,6 +216,7 @@ class SnapshotUnpacker
         obj = NetEvent::HammerHit.new(u)
       elsif @verbose
         puts "no match #{item_type}"
+        exit(1)
       end
       obj = unpack_ddnet_item(u, notes) if !obj && item_type.zero?
       if obj

lib/teeworlds_client.rb

@@ -14,6 +14,7 @@ require_relative 'packer'
 require_relative 'models/player'
 require_relative 'game_client'
 require_relative 'config'
+require_relative 'connection'
 
 class TeeworldsClient
   attr_reader :state, :hooks, :game_client, :verbose_snap
@@ -445,9 +446,20 @@ class TeeworldsClient
     end
     chunks = BigChungusTheChunkGetter.get_chunks(data)
     chunks.each do |chunk|
-      if chunk.flags_vital && !chunk.flags_resend && chunk.msg != NETMSG_NULL
+      if chunk.flags_vital
-        @netbase.ack = (@netbase.ack + 1) % NET_MAX_SEQUENCE
+        if chunk.seq == (@netbase.ack + 1) % NET_MAX_SEQUENCE
-        puts "got ack: #{@netbase.ack}" if @verbose
+          # in sequence
+          @netbase.ack = (@netbase.ack + 1) % NET_MAX_SEQUENCE
+        else
+          puts 'warning: got chunk out of sequence! ' \
+               "seq=#{chunk.seq} expected_seq=#{(@netbase.ack + 1) % NET_MAX_SEQUENCE}"
+          if seq_in_backroom?(chunk.seq, @netbase.ack)
+            puts '         dropping known chunk ...'
+            next
+          end
+          # TODO: request resend
+          puts '         REQUESTING RESEND NOT IMPLEMENTED'
+        end
       end
       process_chunk(chunk)
     end

lib/teeworlds_server.rb

@@ -11,9 +11,11 @@ require_relative 'chunk'
 require_relative 'net_base'
 require_relative 'models/net_addr'
 require_relative 'packer'
+require_relative 'config'
 require_relative 'game_server'
 require_relative 'models/token'
 require_relative 'messages/sv_emoticon'
+require_relative 'snapshot/builder'
 
 class Client
   attr_accessor :id, :addr, :vital_sent, :last_recv_time, :token, :player, :in_game, :authed
@@ -64,14 +66,17 @@ class Client
 end
 
 class TeeworldsServer
-  attr_accessor :clients
+  attr_accessor :clients, :config
   attr_reader :hooks, :shutdown_reason, :current_game_tick
 
   def initialize(options = {})
     @verbose = options[:verbose] || false
     @ip = '127.0.0.1'
     @port = 8303
+    @config = Config.new(file: options[:config], type: :server)
     @game_server = GameServer.new(self)
+    @game_server.load_map
+    # @type clients [Hash<Integer, Client>]
     @clients = {}
     @current_game_tick = 0
     @last_snap_time = Time.now
@@ -369,6 +374,19 @@ class TeeworldsServer
     @netbase.send_packet(msg, chunks: 1, client:)
   end
 
+  ##
+  # https://chillerdragon.github.io/teeworlds-protocol/07/game_messages.html#NETMSGTYPE_SV_CLIENTINFO
+  #
+  # @param client [Client] recipient of the message
+  # @param client_info [ClientInfo] client info net message
+  def send_client_info(client, client_info)
+    data = client_info.to_a
+    msg = NetChunk.create_header(vital: true, size: 1 + data.size, client:) +
+          [pack_msg_id(NETMSGTYPE_SV_CLIENTINFO, system: false)] +
+          data
+    @netbase.send_packet(msg, chunks: 1, client:)
+  end
+
   def send_server_info(client, server_info)
     msg = NetChunk.create_header(vital: true, size: 1 + server_info.size, client:) +
           [pack_msg_id(NETMSG_SERVERINFO, system: true)] +
@@ -470,11 +488,57 @@ class TeeworldsServer
     end
   end
 
+  require_relative 'snapshot/items/game_data'
+  require_relative 'snapshot/items/game_data_team'
+  require_relative 'snapshot/items/game_data_flag'
+  require_relative 'snapshot/items/player_info'
+  require_relative 'snapshot/items/character'
+  require_relative 'snapshot/items/flag'
+
   def do_snap_single
     builder = SnapshotBuilder.new
+    builder.new_item(0, NetObj::Flag.new(
+                          x: 1200, y: 304, team: 0
+                        ))
+    builder.new_item(1, NetObj::Flag.new(
+                          x: 1296, y: 304, team: 1
+                        ))
+    builder.new_item(0, NetObj::GameData.new(
+                          game_start_tick: 0,
+                          game_state_flags: 1,
+                          game_state_end_tick: 500
+                        ))
+    builder.new_item(0, NetObj::GameDataTeam.new(
+                          teamscore_red: 0,
+                          teamscore_blue: 0
+                        ))
+    builder.new_item(0, NetObj::GameDataFlag.new(
+                          flag_carrier_red: -2,
+                          flag_carrier_blue: -2,
+                          flag_drop_tick_red: 0,
+                          flag_drop_tick_blue: 0
+                        ))
+    builder.new_item(0, NetObj::PlayerInfo.new(
+                          player_flags: 8,
+                          score: 0,
+                          latency: 0
+                        ))
+    builder.new_item(0, NetObj::Character.new(
+                          x: 784, y: 305,
+                          vel_x: 0, vel_y: 0,
+                          angle: 0, direction: 0, jumped: 0,
+                          hooked_player: -1, hook_state: 0,
+                          hook_tick: 0, hook_x: 784, hook_y: 304,
+                          hook_dx: 784, hook_dy: 0,
+                          health: 10, armor: 0, ammo_count: 10,
+                          weapon: 1, emote: 0,
+                          attack_tick: 0, triggered_events: 0
+                        ))
     snap = builder.finish
     items = snap.to_a
 
+    delta_tick = -1
+
     data = []
     # Game tick   Int
     data += Packer.pack_int(@current_game_tick)
@@ -483,15 +547,28 @@ class TeeworldsServer
     # Crc   Int
     data += Packer.pack_int(snap.crc)
     # Part size   Int   The size of this part. Meaning the size in bytes of the next raw data field.
-    data += Packer.pack_int(items.size)
+    header = []
+    header += [0x00] # removed items
+    header += Packer.pack_int(snap.items.count) # num item deltas
+    header += [0x00] # _zero
+    part_size = items.size + header.size
+    data += Packer.pack_int(part_size)
     # Data
+    data += header
     data += items
+    msg = NetChunk.create_header(vital: false, size: data.size + 1) +
+          [pack_msg_id(NETMSG_SNAPSINGLE, system: true)] +
+          data
+    @clients.each_value do |client|
+      next unless client.in_game?
 
-    p data
+      @netbase.send_packet(msg, chunks: 1, client:)
+    end
   end
 
   def do_snapshot
     do_snap_empty
+    # do_snap_single
   end
 
   def get_player_by_id(id)

spec/09_snap_builder_spec.rb

@@ -1,39 +1,199 @@
 # frozen_string_literal: true
 
-# require_relative '../lib/snapshot/builder.rb'
+require_relative '../lib/snapshot/builder'
-#
+require_relative '../lib/snapshot/items/character'
-# describe 'SnapshotBuilder', :snapshot do
+require_relative '../lib/snapshot/items/pickup'
-#   context 'finish' do
+require_relative '../lib/snapshot/items/flag'
-#     it 'Should create correct snap' do
+require_relative '../lib/snapshot/items/game_data'
-#       builder = SnapshotBuilder.new
+require_relative '../lib/snapshot/items/game_data_team'
-#       snap = builder.finish
+require_relative '../lib/snapshot/items/game_data_flag'
-#       expected_payload = [
+require_relative '../lib/snapshot/items/player_info'
-#         0x00, 0x01, 0x00, 0x0a, # removed_items=0 num_item_deltas=1 _zero=0 type=10 NetObj::Character
-#         0x00, 0x29, 0x00, 0x0d, # id=0 tick=41 x=0 y=13
-#         0x00, 0xb3, 0x36, 0x00, # vel_x=0 vel_y=3507 angle=0
-#         0x00, 0x40, 0x00, 0x00, # direction=0 jumped=-1 hooked_player=0 hook_state=0
-#         0x00, 0x00, 0x00, 0x00, # hook_tick=0 hook_x=0 hook_y=0 hook_dx=0
-#         0x00, 0x00, 0x00, 0x00, # hook_dy=0 health=0 armor=0 ammo_count=0
-#         0x00, 0x00, 0x00, 0x00, # weapon=0 emote=0 attack_tick=0 triggered_events=0
-#       ]
-#       expect(snap.to_a).to eq(expected_payload)
-#     end
-#   end
-# end
 
-# >>> snap NETMSG_SNAPSINGLE (8)
+describe 'SnapshotBuilder', :snapshot do
-# id=8 game_tick=1908 delta_tick=38
+  context '#finish should create snap payload' do
-# num_parts=1 part=0 crc=16846 part_size=28
+    it 'Should build a snap with one character' do
-#
+      builder = SnapshotBuilder.new
-# header:
+      char = NetObj::Character.new(
-# 11 b4 1d 26      ...& int 17 >> 1 = 8 int 1908 int 38
+        tick: 41, x: 0, y: 13,
-# 8e 87 02 1c      .... int 16846 int 28
+        vel_x: 0, vel_y: 3507, angle: 0,
-#
+        direction: 0, jumped: -1, hooked_player: 0, hook_state: 0,
-# payload:
+        hook_tick: 0, hook_x: 0, hook_y: 0, hook_dx: 0,
-# 00 01 00 0a      .... removed_items=0 num_item_deltas=1 _zero=0 type=10 NetObj::Character
+        hook_dy: 0, health: 0, armor: 0, ammo_count: 0,
-# 00 29 00 0d      .).. id=0 tick=41 x=0 y=13
+        weapon: 0, emote: 0, attack_tick: 0, triggered_events: 0
-# 00 b3 36 00      ..6. vel_x=0 vel_y=3507 angle=0
+      )
-# 00 40 00 00      .@.. direction=0 jumped=-1 hooked_player=0 hook_state=0
+      builder.new_item(0, char)
-# 00 00 00 00      .... hook_tick=0 hook_x=0 hook_y=0 hook_dx=0
+      snap = builder.finish
-# 00 00 00 00      .... hook_dy=0 health=0 armor=0 ammo_count=0
+      expected_payload = [
-# 00 00 00 00      .... weapon=0 emote=0 attack_tick=0 triggered_events=0
+        0x0a, # type=10 NetObj::Character
+        0x00, 0x29, 0x00, 0x0d, # id=0 tick=41 x=0 y=13
+        0x00, 0xb3, 0x36, 0x00, # vel_x=0 vel_y=3507 angle=0
+        0x00, 0x40, 0x00, 0x00, # direction=0 jumped=-1 hooked_player=0 hook_state=0
+        0x00, 0x00, 0x00, 0x00, # hook_tick=0 hook_x=0 hook_y=0 hook_dx=0
+        0x00, 0x00, 0x00, 0x00, # hook_dy=0 health=0 armor=0 ammo_count=0
+        0x00, 0x00, 0x00, 0x00 # weapon=0 emote=0 attack_tick=0 triggered_events=0
+      ]
+      expect(snap.to_a).to eq(expected_payload)
+      # >>> snap NETMSG_SNAPSINGLE (8)
+      # id=8 game_tick=1908 delta_tick=38
+      # num_parts=1 part=0 crc=16846 part_size=28
+      #
+      # header:
+      # 11 b4 1d 26      ...& int 17 >> 1 = 8 int 1908 int 38
+      # 8e 87 02 1c      .... int 16846 int 28
+      #
+      # payload:
+      # 00 01 00 0a      .... removed_items=0 num_item_deltas=1 _zero=0 type=10 NetObj::Character
+      # 00 29 00 0d      .).. id=0 tick=41 x=0 y=13
+      # 00 b3 36 00      ..6. vel_x=0 vel_y=3507 angle=0
+      # 00 40 00 00      .@.. direction=0 jumped=-1 hooked_player=0 hook_state=0
+      # 00 00 00 00      .... hook_tick=0 hook_x=0 hook_y=0 hook_dx=0
+      # 00 00 00 00      .... hook_dy=0 health=0 armor=0 ammo_count=0
+      # 00 00 00 00      .... weapon=0 emote=0 attack_tick=0 triggered_events=0
+    end
+    it 'Should build a snap with multiple items' do
+      builder = SnapshotBuilder.new
+      builder.new_item(0, NetObj::Pickup.new(
+                            x: 1424, y: 272, type: 0
+                          ))
+      builder.new_item(1, NetObj::Pickup.new(
+                            x: 1488, y: 272, type: 2
+                          ))
+      builder.new_item(2, NetObj::Pickup.new(
+                            x: 1552, y: 272, type: 3
+                          ))
+      builder.new_item(3, NetObj::Pickup.new(
+                            x: 1616, y: 272, type: 4
+                          ))
+      builder.new_item(7, NetObj::Pickup.new(
+                            x: 1392, y: 272, type: 1
+                          ))
+      builder.new_item(0, NetObj::Flag.new(
+                            x: 1200, y: 304, team: 0
+                          ))
+      builder.new_item(1, NetObj::Flag.new(
+                            x: 1296, y: 304, team: 1
+                          ))
+      builder.new_item(0, NetObj::GameData.new(
+                            game_start_tick: 1286,
+                            game_state_flags: 0, game_state_end_tick: 0
+                          ))
+      builder.new_item(0, NetObj::GameDataTeam.new(
+                            teamscore_red: 0, teamscore_blue: 0
+                          ))
+      builder.new_item(0, NetObj::GameDataFlag.new(
+                            flag_carrier_red: -2, flag_carrier_blue: -2,
+                            flag_drop_tick_red: 0, flag_drop_tick_blue: 0
+                          ))
+      builder.new_item(0, NetObj::Character.new(
+                            tick: 1314, x: 784, y: 306,
+                            vel_x: 0, vel_y: 256, angle: -707,
+                            direction: 0, jumped: 0, hooked_player: -1, hook_state: 0,
+                            hook_tick: 0, hook_x: 784, hook_y: 305, hook_dx: 0,
+                            hook_dy: 0, health: 0, armor: 0, ammo_count: 0,
+                            weapon: 1, emote: 0, attack_tick: 0, triggered_events: 0
+                          ))
+      builder.new_item(1, NetObj::Character.new(
+                            tick: 1313, x: 848, y: 305,
+                            vel_x: 0, vel_y: 128, angle: 0,
+                            direction: 0, jumped: 0, hooked_player: -1, hook_state: 0,
+                            hook_tick: 0, hook_x: 848, hook_y: 304, hook_dx: 0,
+                            hook_dy: 0, health: 10, armor: 0, ammo_count: 10,
+                            weapon: 1, emote: 0, attack_tick: 0, triggered_events: 0
+                          ))
+      builder.new_item(0, NetObj::PlayerInfo.new(
+                            player_flags: 8, score: 0, latency: 0
+                          ))
+      builder.new_item(1, NetObj::PlayerInfo.new(
+                            player_flags: 8, score: 0, latency: 0
+                          ))
+      snap = builder.finish
+      expected_payload = [
+        0x04, # type=4 NetObj::Pickup
+        0x00, 0x90, 0x16, 0x90, # id=0 x=1424 y=272
+        0x04, 0x00, 0x04, 0x01, # y=272 type=0 id=1 type=4 NetObj::Pickup
+        0x90, 0x17, 0x90, 0x04, # x=1488 y=272
+        0x02, 0x04, 0x02, 0x90, # type=2 id=2 x=1552 type=4 NetObj::Pickup
+        0x18, 0x90, 0x04, 0x03, # x=1552 y=272 type=3
+        0x04, 0x03, 0x90, 0x19, # id=3 x=1616 type=4 NetObj::Pickup
+        0x90, 0x04, 0x04, 0x04, # y=272 type=4 type=4 NetObj::Pickup
+        0x07, 0xb0, 0x15, 0x90, # id=7 x=1392 y=272
+        0x04, 0x01, 0x05, 0x00, # y=272 type=1 id=0 type=5 NetObj::Flag
+        0xb0, 0x12, 0xb0, 0x04, # x=1200 y=304
+        0x00, 0x05, 0x01, 0x90, # team=0 id=1 x=1296 type=5 NetObj::Flag
+        0x14, 0xb0, 0x04, 0x01, # x=1296 y=304 team=1
+        0x06, 0x00, 0x86, 0x14, # id=0 game_start_tick=1286 type=6 NetObj::GameData
+        0x00, 0x00, 0x07, 0x00, # game_state_flags=0 game_state_end_tick=0 id=0 type=7 NetObj::GameDataTeam
+        0x00, 0x00, 0x08, 0x00, # teamscore_red=0 teamscore_blue=0 id=0 type=8 NetObj::GameDataFlag
+        0x41, 0x41, 0x00, 0x00, # flag_carrier_red=-2 flag_carrier_blue=-2 flag_drop_tick_red=0 flag_drop_tick_blue=0
+        0x0a, 0x00, 0xa2, 0x14, # id=0 tick=1314 type=10 NetObj::Character
+        0x90, 0x0c, 0xb2, 0x04, # x=784 y=306
+        0x00, 0x80, 0x04, 0xc2, # vel_x=0 vel_y=256 angle=-707
+        0x0b, 0x00, 0x00, 0x40, # angle=-707 direction=0 jumped=0 hooked_player=-1
+        0x00, 0x00, 0x90, 0x0c, # hook_state=0 hook_tick=0 hook_x=784
+        0xb1, 0x04, 0x00, 0x00, # hook_y=305 hook_dx=0 hook_dy=0
+        0x00, 0x00, 0x00, 0x01, # health=0 armor=0 ammo_count=0 weapon=1
+        0x00, 0x00, 0x00, 0x0a, # emote=0 attack_tick=0 triggered_events=0 type=10 NetObj::Character
+        0x01, 0xa1, 0x14, 0x90, # id=1 tick=1313 x=848
+        0x0d, 0xb1, 0x04, 0x00, # x=848 y=305 vel_x=0
+        0x80, 0x02, 0x00, 0x00, # vel_y=128 angle=0 direction=0
+        0x00, 0x40, 0x00, 0x00, # jumped=0 hooked_player=-1 hook_state=0 hook_tick=0
+        0x90, 0x0d, 0xb0, 0x04, # hook_x=848 hook_y=304
+        0x00, 0x00, 0x0a, 0x00, # hook_dx=0 hook_dy=0 health=10 armor=0
+        0x0a, 0x01, 0x00, 0x00, # ammo_count=10 weapon=1 emote=0 attack_tick=0
+        0x00, 0x0b, 0x00, 0x08, # triggered_events=0 id=0 player_flags=8 type=11 NetObj::PlayerInfo
+        0x00, 0x00, 0x0b, 0x01, # score=0 latency=0 id=1 type=11 NetObj::PlayerInfo
+        0x08, 0x00, 0x00 # player_flags=8 score=0 latency=0
+      ]
+      # snap.to_a.each_with_index do |s, i|
+      #   p "[#{i}] got=#{s} want=#{expected_payload[i]}"
+      #   expect(s).to eq(expected_payload[i])
+      # end
+      expect(snap.to_a).to eq(expected_payload)
+      # >>> snap NETMSG_SNAPSINGLE (8)
+      #   id=8 game_tick=1420 delta_tick=1421
+      #   num_parts=1 part=0 crc=20053 part_size=139
+      #
+      #   header:
+      #   11 8c 16 8d      .... int 17 >> 1 = 8 int 1420 int 1421
+      #   16 95 b9 02      .... int 1421 int 20053
+      #   8b 02            ..   int 139
+      #
+      #   payload:
+      #   00 0e 00 04      .... removed_items=0 num_item_deltas=14 _zero=0 type=4 NetObj::Pickup
+      #   00 90 16 90      .... id=0 x=1424 y=272
+      #   04 00 04 01      .... y=272 type=0 id=1 type=4 NetObj::Pickup
+      #   90 17 90 04      .... x=1488 y=272
+      #   02 04 02 90      .... type=2 id=2 x=1552 type=4 NetObj::Pickup
+      #   18 90 04 03      .... x=1552 y=272 type=3
+      #   04 03 90 19      .... id=3 x=1616 type=4 NetObj::Pickup
+      #   90 04 04 04      .... y=272 type=4 type=4 NetObj::Pickup
+      #   07 b0 15 90      .... id=7 x=1392 y=272
+      #   04 01 05 00      .... y=272 type=1 id=0 type=5 NetObj::Flag
+      #   b0 12 b0 04      .... x=1200 y=304
+      #   00 05 01 90      .... team=0 id=1 x=1296 type=5 NetObj::Flag
+      #   14 b0 04 01      .... x=1296 y=304 team=1
+      #   06 00 86 14      .... id=0 game_start_tick=1286 type=6 NetObj::GameData
+      #   00 00 07 00      .... game_state_flags=0 game_state_end_tick=0 id=0 type=7 NetObj::GameDataTeam
+      #   00 00 08 00      .... teamscore_red=0 teamscore_blue=0 id=0 type=8 NetObj::GameDataFlag
+      #   41 41 00 00      AA.. flag_carrier_red=-2 flag_carrier_blue=-2 flag_drop_tick_red=0 flag_drop_tick_blue=0
+      #   0a 00 a2 14      .... id=0 tick=1314 type=10 NetObj::Character
+      #   90 0c b2 04      .... x=784 y=306
+      #   00 80 04 c2      .... vel_x=0 vel_y=256 angle=-707
+      #   0b 00 00 40      ...@ angle=-707 direction=0 jumped=0 hooked_player=-1
+      #   00 00 90 0c      .... hook_state=0 hook_tick=0 hook_x=784
+      #   b1 04 00 00      .... hook_y=305 hook_dx=0 hook_dy=0
+      #   00 00 00 01      .... health=0 armor=0 ammo_count=0 weapon=1
+      #   00 00 00 0a      .... emote=0 attack_tick=0 triggered_events=0 type=10 NetObj::Character
+      #   01 a1 14 90      .... id=1 tick=1313 x=848
+      #   0d b1 04 00      .... x=848 y=305 vel_x=0
+      #   80 02 00 00      .... vel_y=128 angle=0 direction=0
+      #   00 40 00 00      .@.. jumped=0 hooked_player=-1 hook_state=0 hook_tick=0
+      #   90 0d b0 04      .... hook_x=848 hook_y=304
+      #   00 00 0a 00      .... hook_dx=0 hook_dy=0 health=10 armor=0
+      #   0a 01 00 00      .... ammo_count=10 weapon=1 emote=0 attack_tick=0
+      #   00 0b 00 08      .... triggered_events=0 id=0 player_flags=8 type=11 NetObj::PlayerInfo
+      #   00 00 0b 01      .... score=0 latency=0 id=1 type=11 NetObj::PlayerInfo
+      #   08 00 00         ...  player_flags=8 score=0 latency=0
+    end
+  end
+end