[shogi-server/shogi-server.git] / shogi-server

#! /usr/bin/env ruby
## $Id$

## Copyright (C) 2004 NABEYA Kenichi (aka nanami@2ch)
## Copyright (C) 2007-2008 Daigo Moriwaki (daigo at debian dot org)
##
## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 2 of the License, or
## (at your option) any later version.
##
## This program is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
## GNU General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with this program; if not, write to the Free Software
## Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

require 'kconv'
require 'getoptlong'
require 'thread'
require 'timeout'
require 'socket'
require 'yaml'
require 'yaml/store'
require 'digest/md5'
require 'webrick'
require 'fileutils'

def gets_safe(socket, timeout=nil)
  if r = select([socket], nil, nil, timeout)
    return r[0].first.gets
  else
    return :timeout
  end
rescue Exception => ex
  log_error("#{ex.class}: #{ex.message}\n\t#{ex.backtrace[0]}")
  return :exception
end

module ShogiServer # for a namespace

Max_Identifier_Length = 32
Default_Timeout = 60            # for single socket operation

Default_Game_Name = "default-1500-0"

One_Time = 10
Least_Time_Per_Move = 1
Login_Time = 300                # time for LOGIN

Release  = "$Id$"
Revision = (r = /Revision: (\d+)/.match("$Revision$") ? r[1] : 0)

class League

  class Floodgate
    class << self
      def game_name?(str)
        return /^floodgate-\d+-\d+$/.match(str) ? true : false
      end
    end

    def initialize(league)
      @league = league
      @next_time = nil
      charge
    end

    def run
      @thread = Thread.new do
        Thread.pass
        while (true)
          begin
            sleep(10)
            next if Time.now < @next_time
            @league.reload
            match_game
            charge
          rescue Exception => ex 
            # ignore errors
            log_error("[in Floodgate's thread] #{ex} #{ex.backtrace}")
          end
        end
      end
    end

    def shutdown
      @thread.kill if @thread
    end

    # private

    def charge
      now = Time.now
      if now.min < 30
        @next_time = Time.mktime(now.year, now.month, now.day, now.hour, 30)
      else
        @next_time = Time.mktime(now.year, now.month, now.day, now.hour) + 3600
      end
      # for test
      # if now.sec < 30
      #   @next_time = Time.mktime(now.year, now.month, now.day, now.hour, now.min, 30)
      # else
      #   @next_time = Time.mktime(now.year, now.month, now.day, now.hour, now.min) + 60
      # end
    end

    def match_game
      players = @league.find_all_players do |pl|
        pl.status == "game_waiting" &&
        Floodgate.game_name?(pl.game_name) &&
        pl.sente == nil
      end
      log_warning("DEBUG: %s" % [File.join(File.dirname(__FILE__), "pairing.rb")])
      load File.join(File.dirname(__FILE__), "pairing.rb")
      Pairing.default_pairing.match(players)
    end
  end # class Floodgate

  #
  # This manages those players who have their player_id.
  # Since mk_rate mainly updates the yaml file, basically,
  # this only reads data. But this writes some properties.
  # TODO Such data should be facoted out to another file
  #
  class Persistent
    def initialize(filename)
      @db = YAML::Store.new(filename)
      @db.transaction do |pstore|
        @db['players'] ||= Hash.new
      end
    end

    #
    # trancaction=true means read only
    #
    def each_group(transaction=false)
      @db.transaction(transaction) do
        groups = @db["players"] || Hash.new
        groups.each do |group, players|
          yield group,players
        end
      end
    end

    def load_player(player)
      return unless player.player_id

      hash = nil
      each_group(true) do |group, players|
        hash = players[player.player_id]
        break if hash
      end
      return unless hash

      # a current user
      player.name          = hash['name']
      player.rate          = hash['rate'] || 0
      player.modified_at   = hash['last_modified']
      player.rating_group  = hash['rating_group']
      player.win           = hash['win']  || 0
      player.loss          = hash['loss'] || 0
      player.last_game_win = hash['last_game_win'] || false
    end

    def save(player)
      return unless player.player_id

      each_group do |group, players|
        hash = players[player.player_id]
        if hash
          # write only this property. 
          # the others are updated by ./mk_rate
          hash['last_game_win'] = player.last_game_win
          break
        end
      end
    end

    def get_players
      players = []
      each_group(true) do |group, players_hash|
        players << players_hash.keys
      end
      return players.flatten.collect do |player_id|
        p = BasicPlayer.new
        p.player_id = player_id
        load_player(p)
        p
      end
    end
  end # class Persistent

  def initialize
    @mutex = Mutex.new # guard @players
    @games = Hash::new
    @players = Hash::new
    @event = nil
    @dir = File.dirname(__FILE__)
    @floodgate = Floodgate.new(self)
    @floodgate.run
  end
  attr_accessor :players, :games, :event, :dir

  def shutdown
    @mutex.synchronize do
      @players.each do |name, player| 
        @persistent.save(player)
      end
    end
    @floodgate.shutdown
  end

  # this should be called just after instanciating a League object.
  def setup_players_database
    filename = File.join(@dir, "players.yaml")
    @persistent = Persistent.new(filename)
  end

  def add(player)
    @persistent.load_player(player)
    @mutex.synchronize do
      @players[player.name] = player
    end
  end
  
  def delete(player)
    @persistent.save(player)
    @mutex.synchronize do
      @players.delete(player.name)
    end
  end

  def save(player)
    @persistent.save(player)
  end

  def reload
    @mutex.synchronize do
      @players.each do |name, player| 
        @persistent.load_player(player)
      end
    end
  end

  def find_all_players
    found = nil
    @mutex.synchronize do
      found = @players.find_all do |name, player|
        yield player
      end
    end
    return found.map {|a| a.last}
  end
  
  def find(player_name)
    found = nil
    @mutex.synchronize do
      found = @players[player_name]
    end
    return found
  end

  def get_player(status, game_name, sente, searcher)
    found = nil
    @mutex.synchronize do
      found = @players.find do |name, player|
        (player.status == status) &&
        (player.game_name == game_name) &&
        ( (sente == nil) || 
          (player.sente == nil) || 
          (player.sente == sente) ) &&
        (player.name != searcher.name)
      end
    end
    return found ? found.last : nil
  end
  
  def rated_players
    return @persistent.get_players
  end
end


######################################################
# Processes the LOGIN command.
#
class Login
  def Login.good_login?(str)
    tokens = str.split
    if (((tokens.length == 3) || 
        ((tokens.length == 4) && tokens[3] == "x1")) &&
        (tokens[0] == "LOGIN") &&
        (good_identifier?(tokens[1])))
      return true
    else
      return false
    end
  end

  def Login.good_game_name?(str)
    if ((str =~ /^(.+)-\d+-\d+$/) && (good_identifier?($1)))
      return true
    else
      return false
    end
  end

  def Login.good_identifier?(str)
    if str =~ /\A[\w\d_@\-\.]{1,#{Max_Identifier_Length}}\z/
      return true
    else
      return false
    end
  end

  def Login.factory(str, player)
    (login, player.name, password, ext) = str.chomp.split
    if ext
      return Loginx1.new(player, password)
    else
      return LoginCSA.new(player, password)
    end
  end

  attr_reader :player
  
  # the first command that will be executed just after LOGIN.
  # If it is nil, the default process will be started.
  attr_reader :csa_1st_str

  def initialize(player, password)
    @player = player
    @csa_1st_str = nil
    parse_password(password)
  end

  def process
    @player.write_safe(sprintf("LOGIN:%s OK\n", @player.name))
    log_message(sprintf("user %s run in %s mode", @player.name, @player.protocol))
  end

  def incorrect_duplicated_player(str)
    @player.write_safe("LOGIN:incorrect\n")
    @player.write_safe(sprintf("username %s is already connected\n", @player.name)) if (str.split.length >= 4)
    sleep 3 # wait for sending the above messages.
    @player.name = "%s [duplicated]" % [@player.name]
    @player.finish
  end
end

######################################################
# Processes LOGIN for the CSA standard mode.
#
class LoginCSA < Login
  PROTOCOL = "CSA"

  def initialize(player, password)
    @gamename = nil
    super
    @player.protocol = PROTOCOL
  end

  def parse_password(password)
    if Login.good_game_name?(password)
      @gamename = password
      @player.set_password(nil)
    elsif password.split(",").size > 1
      @gamename, *trip = password.split(",")
      @player.set_password(trip.join(","))
    else
      @player.set_password(password)
      @gamename = Default_Game_Name
    end
    @gamename = self.class.good_game_name?(@gamename) ? @gamename : Default_Game_Name
  end

  def process
    super
    @csa_1st_str = "%%GAME #{@gamename} *"
  end
end

######################################################
# Processes LOGIN for the extented mode.
#
class Loginx1 < Login
  PROTOCOL = "x1"

  def initialize(player, password)
    super
    @player.protocol = PROTOCOL
  end
  
  def parse_password(password)
    @player.set_password(password)
  end

  def process
    super
    @player.write_safe(sprintf("##[LOGIN] +OK %s\n", PROTOCOL))
  end
end


class BasicPlayer
  def initialize
    @player_id = nil
    @name = nil
    @password = nil
    @rate = 0
    @win  = 0
    @loss = 0
    @last_game_win = false
  end

  # Idetifier of the player in the rating system
  attr_accessor :player_id

  # Name of the player
  attr_accessor :name
  
  # Password of the player, which does not include a trip
  attr_accessor :password

  # Score in the rating sysem
  attr_accessor :rate

  # Number of games for win and loss in the rating system
  attr_accessor :win, :loss
  
  # Group in the rating system
  attr_accessor :rating_group

  # Last timestamp when the rate was modified
  attr_accessor :modified_at

  # Whether win the previous game or not
  attr_accessor :last_game_win

  def modified_at
    @modified_at || Time.now
  end

  def rate=(new_rate)
    if @rate != new_rate
      @rate = new_rate
      @modified_at = Time.now
    end
  end

  def rated?
    @player_id != nil
  end

  def last_game_win?
    return @last_game_win
  end

  def simple_player_id
    if @trip
      simple_name = @name.gsub(/@.*?$/, '')
      "%s+%s" % [simple_name, @trip[0..8]]
    else
      @name
    end
  end

  ##
  # Parses str in the LOGIN command, sets up @player_id and @trip
  #
  def set_password(str)
    if str && !str.empty?
      @password = str.strip
      @player_id   = "%s+%s" % [@name, Digest::MD5.hexdigest(@password)]
    else
      @player_id = @password = nil
    end
  end
end


class Player < BasicPlayer
  def initialize(str, socket, eol=nil)
    super()
    @socket = socket
    @status = "connected"       # game_waiting -> agree_waiting -> start_waiting -> game -> finished

    @protocol = nil             # CSA or x1
    @eol = eol || "\m"          # favorite eol code
    @game = nil
    @game_name = ""
    @mytime = 0                 # set in start method also
    @sente = nil
    @socket_buffer = []
    @main_thread = Thread::current
    @mutex_write_guard = Mutex.new
  end

  attr_accessor :socket, :status
  attr_accessor :protocol, :eol, :game, :mytime, :game_name, :sente
  attr_accessor :main_thread
  attr_reader :socket_buffer
  
  def kill
    log_message(sprintf("user %s killed", @name))
    if (@game)
      @game.kill(self)
    end
    finish
    Thread::kill(@main_thread) if @main_thread
  end

  def finish
    if (@status != "finished")
      @status = "finished"
      log_message(sprintf("user %s finish", @name))    
      begin
#        @socket.close if (! @socket.closed?)
      rescue
        log_message(sprintf("user %s finish failed", @name))    
      end
    end
  end

  def write_safe(str)
    @mutex_write_guard.synchronize do
      begin
        if @socket.closed?
          log_warning("%s's socket has been closed." % [@name])
          return
        end
        if r = select(nil, [@socket], nil, 20)
          r[1].first.write(str)
        else
          log_error("Sending a message to #{@name} timed up.")
        end
      rescue Exception => ex
        log_error("Failed to send a message to #{@name}. #{ex.class}: #{ex.message}\t#{ex.backtrace[0]}")
      end
    end
  end

  def to_s
    if ["game_waiting", "start_waiting", "agree_waiting", "game"].include?(status)
      if (@sente)
        return sprintf("%s %s %s %s +", rated? ? @player_id : @name, @protocol, @status, @game_name)
      elsif (@sente == false)
        return sprintf("%s %s %s %s -", rated? ? @player_id : @name, @protocol, @status, @game_name)
      elsif (@sente == nil)
        return sprintf("%s %s %s %s *", rated? ? @player_id : @name, @protocol, @status, @game_name)
      end
    else
      return sprintf("%s %s %s", rated? ? @player_id : @name, @protocol, @status)
    end
  end

  def run(csa_1st_str=nil)
    while ( csa_1st_str || 
            str = gets_safe(@socket, (@socket_buffer.empty? ? Default_Timeout : 1)) )
      $mutex.lock
      begin
        if (@game && @game.turn?(self))
          @socket_buffer << str
          str = @socket_buffer.shift
        end
        log_message("%s (%s)" % [str, @socket_buffer.map {|a| String === a ? a.strip : a }.join(",")]) if $DEBUG

        if (csa_1st_str)
          str = csa_1st_str
          csa_1st_str = nil
        end

        if (@status == "finished")
          return
        end
        str.chomp! if (str.class == String) # may be strip! ?
        case str 
        when "" 
          # Application-level protocol for Keep-Alive
          # If the server gets LF, it sends back LF.
          # 30 sec rule (client may not send LF again within 30 sec) is not implemented yet.
          write_safe("\n")
        when /^[\+\-][^%]/
          if (@status == "game")
            array_str = str.split(",")
            move = array_str.shift
            additional = array_str.shift
            if /^'(.*)/ =~ additional
              comment = array_str.unshift("'*#{$1.toeuc}")
            end
            s = @game.handle_one_move(move, self)
            @game.fh.print("#{Kconv.toeuc(comment.first)}\n") if (comment && comment.first && !s)
            return if (s && @protocol == LoginCSA::PROTOCOL)
          end
        when /^%[^%]/, :timeout
          if (@status == "game")
            s = @game.handle_one_move(str, self)
            return if (s && @protocol == LoginCSA::PROTOCOL)
          end
        when :exception
          log_error("Failed to receive a message from #{@name}.")
          return
        when /^REJECT/
          if (@status == "agree_waiting")
            @game.reject(@name)
            return if (@protocol == LoginCSA::PROTOCOL)
          else
            write_safe(sprintf("##[ERROR] you are in %s status. AGREE is valid in agree_waiting status\n", @status))
          end
        when /^AGREE/
          if (@status == "agree_waiting")
            @status = "start_waiting"
            if ((@game.sente.status == "start_waiting") &&
                (@game.gote.status == "start_waiting"))
              @game.start
              @game.sente.status = "game"
              @game.gote.status = "game"
            end
          else
            write_safe(sprintf("##[ERROR] you are in %s status. AGREE is valid in agree_waiting status\n", @status))
          end
        when /^%%SHOW\s+(\S+)/
          game_id = $1
          if (LEAGUE.games[game_id])
            write_safe(LEAGUE.games[game_id].show.gsub(/^/, '##[SHOW] '))
          end
          write_safe("##[SHOW] +OK\n")
        when /^%%MONITORON\s+(\S+)/
          game_id = $1
          if (LEAGUE.games[game_id])
            LEAGUE.games[game_id].monitoron(self)
            write_safe(LEAGUE.games[game_id].show.gsub(/^/, "##[MONITOR][#{game_id}] "))
            write_safe("##[MONITOR][#{game_id}] +OK\n")
          end
        when /^%%MONITOROFF\s+(\S+)/
          game_id = $1
          if (LEAGUE.games[game_id])
            LEAGUE.games[game_id].monitoroff(self)
          end
        when /^%%HELP/
          write_safe(
            %!##[HELP] available commands "%%WHO", "%%CHAT str", "%%GAME game_name +", "%%GAME game_name -"\n!)
        when /^%%RATING/
          players = LEAGUE.rated_players
          players.sort {|a,b| b.rate <=> a.rate}.each do |p|
            write_safe("##[RATING] %s \t %4d @%s\n" % 
                       [p.simple_player_id, p.rate, p.modified_at.strftime("%Y-%m-%d")])
          end
          write_safe("##[RATING] +OK\n")
        when /^%%VERSION/
          write_safe "##[VERSION] Shogi Server revision #{Revision}\n"
          write_safe("##[VERSION] +OK\n")
        when /^%%GAME\s*$/
          if ((@status == "connected") || (@status == "game_waiting"))
            @status = "connected"
            @game_name = ""
          else
            write_safe(sprintf("##[ERROR] you are in %s status. GAME is valid in connected or game_waiting status\n", @status))
          end
        when /^%%(GAME|CHALLENGE)\s+(\S+)\s+([\+\-\*])\s*$/
          command_name = $1
          game_name = $2
          my_sente_str = $3
          if (! Login::good_game_name?(game_name))
            write_safe(sprintf("##[ERROR] bad game name\n"))
            next
          elsif ((@status == "connected") || (@status == "game_waiting"))
            ## continue
          else
            write_safe(sprintf("##[ERROR] you are in %s status. GAME is valid in connected or game_waiting status\n", @status))
            next
          end

          rival = nil
          if (League::Floodgate.game_name?(game_name))
            if (my_sente_str != "*")
              write_safe(sprintf("##[ERROR] You are not allowed to specify TEBAN %s for the game %s\n", my_sente_str, game_name))
              next
            end
            @sente = nil
          else
            if (my_sente_str == "*")
              rival = LEAGUE.get_player("game_waiting", game_name, nil, self) # no preference
            elsif (my_sente_str == "+")
              rival = LEAGUE.get_player("game_waiting", game_name, false, self) # rival must be gote
            elsif (my_sente_str == "-")
              rival = LEAGUE.get_player("game_waiting", game_name, true, self) # rival must be sente
            else
              ## never reached
              write_safe(sprintf("##[ERROR] bad game option\n"))
              next
            end
          end

          if (rival)
            @game_name = game_name
            if ((my_sente_str == "*") && (rival.sente == nil))
              if (rand(2) == 0)
                @sente = true
                rival.sente = false
              else
                @sente = false
                rival.sente = true
              end
            elsif (rival.sente == true) # rival has higher priority
              @sente = false
            elsif (rival.sente == false)
              @sente = true
            elsif (my_sente_str == "+")
              @sente = true
              rival.sente = false
            elsif (my_sente_str == "-")
              @sente = false
              rival.sente = true
            else
              ## never reached
            end
            Game::new(@game_name, self, rival)
          else # rival not found
            if (command_name == "GAME")
              @status = "game_waiting"
              @game_name = game_name
              if (my_sente_str == "+")
                @sente = true
              elsif (my_sente_str == "-")
                @sente = false
              else
                @sente = nil
              end
            else                # challenge
              write_safe(sprintf("##[ERROR] can't find rival for %s\n", game_name))
              @status = "connected"
              @game_name = ""
              @sente = nil
            end
          end
        when /^%%CHAT\s+(.+)/
          message = $1
          LEAGUE.players.each do |name, player|
            if (player.protocol != LoginCSA::PROTOCOL)
              player.write_safe(sprintf("##[CHAT][%s] %s\n", @name, message)) 
            end
          end
        when /^%%LIST/
          buf = Array::new
          LEAGUE.games.each do |id, game|
            buf.push(sprintf("##[LIST] %s\n", id))
          end
          buf.push("##[LIST] +OK\n")
          write_safe(buf.join)
        when /^%%WHO/
          buf = Array::new
          LEAGUE.players.each do |name, player|
            buf.push(sprintf("##[WHO] %s\n", player.to_s))
          end
          buf.push("##[WHO] +OK\n")
          write_safe(buf.join)
        when /^LOGOUT/
          @status = "connected"
          write_safe("LOGOUT:completed\n")
          return
        when /^CHALLENGE/
          # This command is only available for CSA's official testing server.
          # So, this means nothing for this program.
          write_safe("CHALLENGE ACCEPTED\n")
        when /^\s*$/
          ## ignore null string
        else
          msg = "##[ERROR] unknown command %s\n" % [str]
          write_safe(msg)
          log_error(msg)
        end
      ensure
        $mutex.unlock
      end
    end # enf of while
  end # def run
end # class

class Piece
  PROMOTE = {"FU" => "TO", "KY" => "NY", "KE" => "NK", 
             "GI" => "NG", "KA" => "UM", "HI" => "RY"}
  def initialize(board, x, y, sente, promoted=false)
    @board = board
    @x = x
    @y = y
    @sente = sente
    @promoted = promoted

    if ((x == 0) || (y == 0))
      if (sente)
        hands = board.sente_hands
      else
        hands = board.gote_hands
      end
      hands.push(self)
      hands.sort! {|a, b|
        a.name <=> b.name
      }
    else
      @board.array[x][y] = self
    end
  end
  attr_accessor :promoted, :sente, :x, :y, :board

  def room_of_head?(x, y, name)
    true
  end

  def movable_grids
    return adjacent_movable_grids + far_movable_grids
  end

  def far_movable_grids
    return []
  end

  def jump_to?(x, y)
    if ((1 <= x) && (x <= 9) && (1 <= y) && (y <= 9))
      if ((@board.array[x][y] == nil) || # dst is empty
          (@board.array[x][y].sente != @sente)) # dst is enemy
        return true
      end
    end
    return false
  end

  def put_to?(x, y)
    if ((1 <= x) && (x <= 9) && (1 <= y) && (y <= 9))
      if (@board.array[x][y] == nil) # dst is empty?
        return true
      end
    end
    return false
  end

  def adjacent_movable_grids
    grids = Array::new
    if (@promoted)
      moves = @promoted_moves
    else
      moves = @normal_moves
    end
    moves.each do |(dx, dy)|
      if (@sente)
        cand_y = @y - dy
      else
        cand_y = @y + dy
      end
      cand_x = @x + dx
      if (jump_to?(cand_x, cand_y))
        grids.push([cand_x, cand_y])
      end
    end
    return grids
  end

  def move_to?(x, y, name)
    return false if (! room_of_head?(x, y, name))
    return false if ((name != @name) && (name != @promoted_name))
    return false if (@promoted && (name != @promoted_name)) # can't un-promote

    if (! @promoted)
      return false if (((@x == 0) || (@y == 0)) && (name != @name)) # can't put promoted piece
      if (@sente)
        return false if ((4 <= @y) && (4 <= y) && (name != @name)) # can't promote
      else
        return false if ((6 >= @y) && (6 >= y) && (name != @name))
      end
    end

    if ((@x == 0) || (@y == 0))
      return jump_to?(x, y)
    else
      return movable_grids.include?([x, y])
    end
  end

  def move_to(x, y)
    if ((@x == 0) || (@y == 0))
      if (@sente)
        @board.sente_hands.delete(self)
      else
        @board.gote_hands.delete(self)
      end
      @board.array[x][y] = self
    elsif ((x == 0) || (y == 0))
      @promoted = false         # clear promoted flag before moving to hands
      if (@sente)
        @board.sente_hands.push(self)
      else
        @board.gote_hands.push(self)
      end
      @board.array[@x][@y] = nil
    else
      @board.array[@x][@y] = nil
      @board.array[x][y] = self
    end
    @x = x
    @y = y
  end

  def point
    @point
  end

  def name
    @name
  end

  def promoted_name
    @promoted_name
  end

  def to_s
    if (@sente)
      sg = "+"
    else
      sg = "-"
    end
    if (@promoted)
      n = @promoted_name
    else
      n = @name
    end
    return sg + n
  end
end

class PieceFU < Piece
  def initialize(*arg)
    @point = 1
    @normal_moves = [[0, +1]]
    @promoted_moves = [[0, +1], [+1, +1], [-1, +1], [+1, +0], [-1, +0], [0, -1]]
    @name = "FU"
    @promoted_name = "TO"
    super
  end
  def room_of_head?(x, y, name)
    if (name == "FU")
      if (@sente)
        return false if (y == 1)
      else
        return false if (y == 9)
      end
      ## 2fu check
      c = 0
      iy = 1
      while (iy <= 9)
        if ((iy  != @y) &&      # not source position
            @board.array[x][iy] &&
            (@board.array[x][iy].sente == @sente) && # mine
            (@board.array[x][iy].name == "FU") &&
            (@board.array[x][iy].promoted == false))
          return false
        end
        iy = iy + 1
      end
    end
    return true
  end
end

class PieceKY  < Piece
  def initialize(*arg)
    @point = 1
    @normal_moves = []
    @promoted_moves = [[0, +1], [+1, +1], [-1, +1], [+1, +0], [-1, +0], [0, -1]]
    @name = "KY"
    @promoted_name = "NY"
    super
  end
  def room_of_head?(x, y, name)
    if (name == "KY")
      if (@sente)
        return false if (y == 1)
      else
        return false if (y == 9)
      end
    end
    return true
  end
  def far_movable_grids
    grids = Array::new
    if (@promoted)
      return []
    else
      if (@sente)                 # up
        cand_x = @x
        cand_y = @y - 1
        while (jump_to?(cand_x, cand_y))
          grids.push([cand_x, cand_y])
          break if (! put_to?(cand_x, cand_y))
          cand_y = cand_y - 1
        end
      else                        # down
        cand_x = @x
        cand_y = @y + 1
        while (jump_to?(cand_x, cand_y))
          grids.push([cand_x, cand_y])
          break if (! put_to?(cand_x, cand_y))
          cand_y = cand_y + 1
        end
      end
      return grids
    end
  end
end
class PieceKE  < Piece
  def initialize(*arg)
    @point = 1
    @normal_moves = [[+1, +2], [-1, +2]]
    @promoted_moves = [[0, +1], [+1, +1], [-1, +1], [+1, +0], [-1, +0], [0, -1]]
    @name = "KE"
    @promoted_name = "NK"
    super
  end
  def room_of_head?(x, y, name)
    if (name == "KE")
      if (@sente)
        return false if ((y == 1) || (y == 2))
      else
        return false if ((y == 9) || (y == 8))
      end
    end
    return true
  end
end
class PieceGI  < Piece
  def initialize(*arg)
    @point = 1
    @normal_moves = [[0, +1], [+1, +1], [-1, +1], [+1, -1], [-1, -1]]
    @promoted_moves = [[0, +1], [+1, +1], [-1, +1], [+1, +0], [-1, +0], [0, -1]]
    @name = "GI"
    @promoted_name = "NG"
    super
  end
end
class PieceKI  < Piece
  def initialize(*arg)
    @point = 1
    @normal_moves = [[0, +1], [+1, +1], [-1, +1], [+1, +0], [-1, +0], [0, -1]]
    @promoted_moves = []
    @name = "KI"
    @promoted_name = nil
    super
  end
end
class PieceKA  < Piece
  def initialize(*arg)
    @point = 5
    @normal_moves = []
    @promoted_moves = [[0, +1], [+1, 0], [-1, 0], [0, -1]]
    @name = "KA"
    @promoted_name = "UM"
    super
  end
  def far_movable_grids
    grids = Array::new
    ## up right
    cand_x = @x - 1
    cand_y = @y - 1
    while (jump_to?(cand_x, cand_y))
      grids.push([cand_x, cand_y])
      break if (! put_to?(cand_x, cand_y))
      cand_x = cand_x - 1
      cand_y = cand_y - 1
    end
    ## down right
    cand_x = @x - 1
    cand_y = @y + 1
    while (jump_to?(cand_x, cand_y))
      grids.push([cand_x, cand_y])
      break if (! put_to?(cand_x, cand_y))
      cand_x = cand_x - 1
      cand_y = cand_y + 1
    end
    ## up left
    cand_x = @x + 1
    cand_y = @y - 1
    while (jump_to?(cand_x, cand_y))
      grids.push([cand_x, cand_y])
      break if (! put_to?(cand_x, cand_y))
      cand_x = cand_x + 1
      cand_y = cand_y - 1
    end
    ## down left
    cand_x = @x + 1
    cand_y = @y + 1
    while (jump_to?(cand_x, cand_y))
      grids.push([cand_x, cand_y])
      break if (! put_to?(cand_x, cand_y))
      cand_x = cand_x + 1
      cand_y = cand_y + 1
    end
    return grids
  end
end
class PieceHI  < Piece
  def initialize(*arg)
    @point = 5
    @normal_moves = []
    @promoted_moves = [[+1, +1], [-1, +1], [+1, -1], [-1, -1]]
    @name = "HI"
    @promoted_name = "RY"
    super
  end
  def far_movable_grids
    grids = Array::new
    ## up
    cand_x = @x
    cand_y = @y - 1
    while (jump_to?(cand_x, cand_y))
      grids.push([cand_x, cand_y])
      break if (! put_to?(cand_x, cand_y))
      cand_y = cand_y - 1
    end
    ## down
    cand_x = @x
    cand_y = @y + 1
    while (jump_to?(cand_x, cand_y))
      grids.push([cand_x, cand_y])
      break if (! put_to?(cand_x, cand_y))
      cand_y = cand_y + 1
    end
    ## right
    cand_x = @x - 1
    cand_y = @y
    while (jump_to?(cand_x, cand_y))
      grids.push([cand_x, cand_y])
      break if (! put_to?(cand_x, cand_y))
      cand_x = cand_x - 1
    end
    ## down
    cand_x = @x + 1
    cand_y = @y
    while (jump_to?(cand_x, cand_y))
      grids.push([cand_x, cand_y])
      break if (! put_to?(cand_x, cand_y))
      cand_x = cand_x + 1
    end
    return grids
  end
end
class PieceOU < Piece
  def initialize(*arg)
    @point = 0
    @normal_moves = [[0, +1], [+1, +1], [-1, +1], [+1, +0], [-1, +0], [0, -1], [+1, -1], [-1, -1]]
    @promoted_moves = []
    @name = "OU"
    @promoted_name = nil
    super
  end
end

class Board
  def initialize
    @sente_hands = Array::new
    @gote_hands  = Array::new
    @history       = Hash::new(0)
    @sente_history = Hash::new(0)
    @gote_history  = Hash::new(0)
    @array = [[], [], [], [], [], [], [], [], [], []]
    @move_count = 0
    @teban = nil # black => true, white => false
  end
  attr_accessor :array, :sente_hands, :gote_hands, :history, :sente_history, :gote_history
  attr_reader :move_count

  def initial
    PieceKY::new(self, 1, 1, false)
    PieceKE::new(self, 2, 1, false)
    PieceGI::new(self, 3, 1, false)
    PieceKI::new(self, 4, 1, false)
    PieceOU::new(self, 5, 1, false)
    PieceKI::new(self, 6, 1, false)
    PieceGI::new(self, 7, 1, false)
    PieceKE::new(self, 8, 1, false)
    PieceKY::new(self, 9, 1, false)
    PieceKA::new(self, 2, 2, false)
    PieceHI::new(self, 8, 2, false)
    (1..9).each do |i|
      PieceFU::new(self, i, 3, false)
    end

    PieceKY::new(self, 1, 9, true)
    PieceKE::new(self, 2, 9, true)
    PieceGI::new(self, 3, 9, true)
    PieceKI::new(self, 4, 9, true)
    PieceOU::new(self, 5, 9, true)
    PieceKI::new(self, 6, 9, true)
    PieceGI::new(self, 7, 9, true)
    PieceKE::new(self, 8, 9, true)
    PieceKY::new(self, 9, 9, true)
    PieceKA::new(self, 8, 8, true)
    PieceHI::new(self, 2, 8, true)
    (1..9).each do |i|
      PieceFU::new(self, i, 7, true)
    end
    @teban = true
  end

  def have_piece?(hands, name)
    piece = hands.find { |i|
      i.name == name
    }
    return piece
  end

  def move_to(x0, y0, x1, y1, name, sente)
    if (sente)
      hands = @sente_hands
    else
      hands = @gote_hands
    end

    if ((x0 == 0) || (y0 == 0))
      piece = have_piece?(hands, name)
      return :illegal if (! piece.move_to?(x1, y1, name)) # TODO null check for the piece?
      piece.move_to(x1, y1)
    else
      return :illegal if (! @array[x0][y0].move_to?(x1, y1, name))  # TODO null check?
      if (@array[x0][y0].name != name) # promoted ?
        @array[x0][y0].promoted = true
      end
      if (@array[x1][y1]) # capture
        if (@array[x1][y1].name == "OU")
          return :outori        # return board update
        end
        @array[x1][y1].sente = @array[x0][y0].sente
        @array[x1][y1].move_to(0, 0)
        hands.sort! {|a, b| # TODO refactor. Move to Piece class
          a.name <=> b.name
        }
      end
      @array[x0][y0].move_to(x1, y1)
    end
    @move_count += 1
    @teban = @teban ? false : true
    return true
  end

  def look_for_ou(sente)
    x = 1
    while (x <= 9)
      y = 1
      while (y <= 9)
        if (@array[x][y] &&
            (@array[x][y].name == "OU") &&
            (@array[x][y].sente == sente))
          return @array[x][y]
        end
        y = y + 1
      end
      x = x + 1
    end
    raise "can't find ou"
  end

  # note checkmate, but check. sente is checked.
  def checkmated?(sente)        # sente is loosing
    ou = look_for_ou(sente)
    x = 1
    while (x <= 9)
      y = 1
      while (y <= 9)
        if (@array[x][y] &&
            (@array[x][y].sente != sente))
          if (@array[x][y].movable_grids.include?([ou.x, ou.y]))
            return true
          end
        end
        y = y + 1
      end
      x = x + 1
    end
    return false
  end

  def uchifuzume?(sente)
    rival_ou = look_for_ou(! sente)   # rival's ou
    if (sente)                  # rival is gote
      if ((rival_ou.y != 9) &&
          (@array[rival_ou.x][rival_ou.y + 1]) &&
          (@array[rival_ou.x][rival_ou.y + 1].name == "FU") &&
          (@array[rival_ou.x][rival_ou.y + 1].sente == sente)) # uchifu true
        fu_x = rival_ou.x
        fu_y = rival_ou.y + 1
      else
        return false
      end
    else                        # gote
      if ((rival_ou.y != 1) &&
          (@array[rival_ou.x][rival_ou.y - 1]) &&
          (@array[rival_ou.x][rival_ou.y - 1].name == "FU") &&
          (@array[rival_ou.x][rival_ou.y - 1].sente == sente)) # uchifu true
        fu_x = rival_ou.x
        fu_y = rival_ou.y - 1
      else
        return false
      end
    end

    ## case: rival_ou is moving
    rival_ou.movable_grids.each do |(cand_x, cand_y)|
      tmp_board = Marshal.load(Marshal.dump(self))
      s = tmp_board.move_to(rival_ou.x, rival_ou.y, cand_x, cand_y, "OU", ! sente)
      raise "internal error" if (s != true)
      if (! tmp_board.checkmated?(! sente)) # good move
        return false
      end
    end

    ## case: rival is capturing fu
    x = 1
    while (x <= 9)
      y = 1
      while (y <= 9)
        if (@array[x][y] &&
            (@array[x][y].sente != sente) &&
            @array[x][y].movable_grids.include?([fu_x, fu_y])) # capturable
          
          names = []
          if (@array[x][y].promoted)
            names << @array[x][y].promoted_name
          else
            names << @array[x][y].name
            if @array[x][y].promoted_name && 
               @array[x][y].move_to?(fu_x, fu_y, @array[x][y].promoted_name)
              names << @array[x][y].promoted_name 
            end
          end
          names.map! do |name|
            tmp_board = Marshal.load(Marshal.dump(self))
            s = tmp_board.move_to(x, y, fu_x, fu_y, name, ! sente)
            if s == :illegal
              s # result
            else
              tmp_board.checkmated?(! sente) # result
            end
          end
          all_illegal = names.find {|a| a != :illegal}
          raise "internal error: legal move not found" if all_illegal == nil
          r = names.find {|a| a == false} # good move
          return false if r == false # found good move
        end
        y = y + 1
      end
      x = x + 1
    end
    return true
  end

  # @[sente|gote]_history has at least one item while the player is checking the other or 
  # the other escapes.
  def update_sennichite(player)
    str = to_s
    @history[str] += 1
    if checkmated?(!player)
      if (player)
        @sente_history["dummy"] = 1  # flag to see Sente player is checking Gote player
      else
        @gote_history["dummy"]  = 1  # flag to see Gote player is checking Sente player
      end
    else
      if (player)
        @sente_history.clear # no more continuous check
      else
        @gote_history.clear  # no more continuous check
      end
    end
    if @sente_history.size > 0  # possible for Sente's or Gote's turn
      @sente_history[str] += 1
    end
    if @gote_history.size > 0   # possible for Sente's or Gote's turn
      @gote_history[str] += 1
    end
  end

  def oute_sennichite?(player)
    if (@sente_history[to_s] >= 4)
      return :oute_sennichite_sente_lose
    elsif (@gote_history[to_s] >= 4)
      return :oute_sennichite_gote_lose
    else
      return nil
    end
  end

  def sennichite?(sente)
    if (@history[to_s] >= 4) # already 3 times
      return true
    end
    return false
  end

  def good_kachi?(sente)
    if (checkmated?(sente))
      puts "'NG: Checkmating." if $DEBUG
      return false 
    end
    
    ou = look_for_ou(sente)
    if (sente && (ou.y >= 4))
      puts "'NG: Black's OU does not enter yet." if $DEBUG
      return false     
    end  
    if (! sente && (ou.y <= 6))
      puts "'NG: White's OU does not enter yet." if $DEBUG
      return false 
    end
      
    number = 0
    point = 0

    if (sente)
      hands = @sente_hands
      r = [1, 2, 3]
    else
      hands = @gote_hands
      r = [7, 8, 9]
    end
    r.each do |y|
      x = 1
      while (x <= 9)
        if (@array[x][y] &&
            (@array[x][y].sente == sente) &&
            (@array[x][y].point > 0))
          point = point + @array[x][y].point
          number = number + 1
        end
        x = x + 1
      end
    end
    hands.each do |piece|
      point = point + piece.point
    end

    if (number < 10)
      puts "'NG: Piece#[%d] is too small." % [number] if $DEBUG
      return false     
    end  
    if (sente)
      if (point < 28)
        puts "'NG: Black's point#[%d] is too small." % [point] if $DEBUG
        return false 
      end  
    else
      if (point < 27)
        puts "'NG: White's point#[%d] is too small." % [point] if $DEBUG
        return false 
      end
    end

    puts "'Good: Piece#[%d], Point[%d]." % [number, point] if $DEBUG
    return true
  end

  # sente is nil only if tests in test_board run
  def handle_one_move(str, sente=nil)
    if (str =~ /^([\+\-])(\d)(\d)(\d)(\d)([A-Z]{2})/)
      sg = $1
      x0 = $2.to_i
      y0 = $3.to_i
      x1 = $4.to_i
      y1 = $5.to_i
      name = $6
    elsif (str =~ /^%KACHI/)
      raise ArgumentError, "sente is null", caller if sente == nil
      if (good_kachi?(sente))
        return :kachi_win
      else
        return :kachi_lose
      end
    elsif (str =~ /^%TORYO/)
      return :toryo
    else
      return :illegal
    end
    
    if (((x0 == 0) || (y0 == 0)) && # source is not from hand
        ((x0 != 0) || (y0 != 0)))
      return :illegal
    elsif ((x1 == 0) || (y1 == 0)) # destination is out of board
      return :illegal
    end
    
    if (sg == "+")
      sente = true if sente == nil           # deprecated
      return :illegal unless sente == true   # black player's move must be black
      hands = @sente_hands
    else
      sente = false if sente == nil          # deprecated
      return :illegal unless sente == false  # white player's move must be white
      hands = @gote_hands
    end
    
    ## source check
    if ((x0 == 0) && (y0 == 0))
      return :illegal if (! have_piece?(hands, name))
    elsif (! @array[x0][y0])
      return :illegal           # no piece
    elsif (@array[x0][y0].sente != sente)
      return :illegal           # this is not mine
    elsif (@array[x0][y0].name != name)
      return :illegal if (@array[x0][y0].promoted_name != name) # can't promote
    end

    ## destination check
    if (@array[x1][y1] &&
        (@array[x1][y1].sente == sente)) # can't capture mine
      return :illegal
    elsif ((x0 == 0) && (y0 == 0) && @array[x1][y1])
      return :illegal           # can't put on existing piece
    end

    tmp_board = Marshal.load(Marshal.dump(self))
    return :illegal if (tmp_board.move_to(x0, y0, x1, y1, name, sente) == :illegal)
    return :oute_kaihimore if (tmp_board.checkmated?(sente))
    tmp_board.update_sennichite(sente)
    os_result = tmp_board.oute_sennichite?(sente)
    return os_result if os_result # :oute_sennichite_sente_lose or :oute_sennichite_gote_lose
    return :sennichite if tmp_board.sennichite?(sente)

    if ((x0 == 0) && (y0 == 0) && (name == "FU") && tmp_board.uchifuzume?(sente))
      return :uchifuzume
    end

    move_to(x0, y0, x1, y1, name, sente)

    update_sennichite(sente)
    return :normal
  end

  def to_s
    a = Array::new
    y = 1
    while (y <= 9)
      a.push(sprintf("P%d", y))
      x = 9
      while (x >= 1)
        piece = @array[x][y]
        if (piece)
          s = piece.to_s
        else
          s = " * "
        end
        a.push(s)
        x = x - 1
      end
      a.push(sprintf("\n"))
      y = y + 1
    end
    if (! sente_hands.empty?)
      a.push("P+")
      sente_hands.each do |p|
        a.push("00" + p.name)
      end
      a.push("\n")
    end
    if (! gote_hands.empty?)
      a.push("P-")
      gote_hands.each do |p|
        a.push("00" + p.name)
      end
      a.push("\n")
    end
    a.push("%s\n" % [@teban ? "+" : "-"])
    return a.join
  end
end

class GameResult
  attr_reader :players, :black, :white

  def initialize(game, p1, p2)
    @game = game
    @players = [p1, p2]
    if p1.sente && !p2.sente
      @black, @white = p1, p2
    elsif !p1.sente && p2.sente
      @black, @white = p2, p1
    else
      raise "Never reached!"
    end
    @players.each do |player|
      player.status = "connected"
      LEAGUE.save(player)
    end
  end

  def process
    raise "Implement me!"
  end

  def log(str)
    @game.log_game(str)
  end

  def log_board
    log(@game.board.to_s.gsub(/^/, "\'"))
  end

  def log_rating
    log("'rating:%s\n" % [self.to_s]) if @game.rated?
  end

  def to_s
    black_name = @black.rated? ? @black.player_id : @black.name
    white_name = @white.rated? ? @white.player_id : @white.name
    return "%s:%s" % [black_name, white_name]
  end

  def notify_monitor(type)
    @game.each_monitor do |monitor|
      monitor.write_safe(sprintf("##[MONITOR][%s] %s\n", @game.game_id, type))
    end
  end
end

class GameResultWin < GameResult
  attr_reader :winner, :loser

  def initialize(game, winner, loser)
    super
    @winner, @loser = winner, loser
    @winner.last_game_win = true
    @loser.last_game_win  = false
  end

  def log_summary(type)
    log_board

    black_result = white_result = ""
    if @black == @winner
      black_result = "win"
      white_result = "lose"
    else
      black_result = "lose"
      white_result = "win"
    end
    log("'summary:%s:%s %s:%s %s\n" % [type, 
                                       @black.name, black_result,
                                       @white.name, white_result])

    log_rating
  end
end

class GameResultAbnormalWin < GameResultWin
  def process
    @winner.write_safe("%TORYO\n#RESIGN\n#WIN\n")
    @loser.write_safe( "%TORYO\n#RESIGN\n#LOSE\n")
    log("%%TORYO\n")
    log_summary("abnormal")
    notify_monitor("%%TORYO")
  end
end

class GameResultTimeoutWin < GameResultWin
  def process
    @winner.write_safe("#TIME_UP\n#WIN\n")
    @loser.write_safe( "#TIME_UP\n#LOSE\n")
    log_summary("time up")
    notify_monitor("#TIME_UP")
  end
end

# A player declares (successful) Kachi
class GameResultKachiWin < GameResultWin
  def process
    @winner.write_safe("%KACHI\n#JISHOGI\n#WIN\n")
    @loser.write_safe( "%KACHI\n#JISHOGI\n#LOSE\n")
    log("%%KACHI\n")
    log_summary("kachi")
    notify_monitor("%%KACHI")
  end
end

# A player declares wrong Kachi
class GameResultIllegalKachiWin < GameResultWin
  def process
    @winner.write_safe("%KACHI\n#ILLEGAL_MOVE\n#WIN\n")
    @loser.write_safe( "%KACHI\n#ILLEGAL_MOVE\n#LOSE\n")
    log("%%KACHI\n")
    log_summary("illegal kachi")
    notify_monitor("%%KACHI")
  end
end

class GameResultIllegalWin < GameResultWin
  def initialize(game, winner, loser, cause)
    super(game, winner, loser)
    @cause = cause
  end

  def process
    @winner.write_safe("#ILLEGAL_MOVE\n#WIN\n")
    @loser.write_safe( "#ILLEGAL_MOVE\n#LOSE\n")
    log_summary(@cause)
    notify_monitor("#ILLEGAL_MOVE")
  end
end

class GameResultIllegalMoveWin < GameResultIllegalWin
  def initialize(game, winner, loser)
    super(game, winner, loser, "illegal move")
  end
end

class GameResultUchifuzumeWin < GameResultIllegalWin
  def initialize(game, winner, loser)
    super(game, winner, loser, "uchifuzume")
  end
end

class GameResultOuteKaihiMoreWin < GameResultWin
  def initialize(game, winner, loser)
    super(game, winner, loser, "oute_kaihimore")
  end
end

class GameResultOutoriWin < GameResultWin
  def initialize(game, winner, loser)
    super(game, winner, loser, "outori")
  end
end

class GameReulstToryoWin < GameResultWin
  def process
    @winner.write_safe("%TORYO\n#RESIGN\n#WIN\n")
    @loser.write_safe( "%TORYO\n#RESIGN\n#LOSE\n")
    log("%%TORYO\n")
    log_summary("toryo")
    notify_monitor("%%TORYO")
  end
end

class GameResultOuteSennichiteWin < GameResultWin
  def process
    @winner.write_safe("#OUTE_SENNICHITE\n#WIN\n")
    @loser.write_safe( "#OUTE_SENNICHITE\n#LOSE\n")
    log_summary("oute_sennichite")
    notify_monitor("#OUTE_SENNICHITE")
  end
end

class GameResultDraw < GameResult
  def initialize(game, p1, p2)
    super
    p1.last_game_win = false
    p2.last_game_win = false
  end
  
  def log_summary(type)
    log_board
    log("'summary:%s:%s draw:%s draw\n", type, @black.name, @white.name)
    log_rating
  end
end

class GameResultSennichiteDraw < GameResultDraw
  def process
    @players.each do |player|
      player.write_safe("#SENNICHITE\n#DRAW\n")
    end
    log_summary("sennichite")
    notify_monitor("#SENNICHITE")
  end
end

class Game
  @@mutex = Mutex.new
  @@time  = 0

  def initialize(game_name, player0, player1)
    @monitors = Array::new
    @game_name = game_name
    if (@game_name =~ /-(\d+)-(\d+)$/)
      @total_time = $1.to_i
      @byoyomi = $2.to_i
    end

    if (player0.sente)
      @sente, @gote = player0, player1
    else
      @sente, @gote = player1, player0
    end
    @sente.socket_buffer.clear
    @gote.socket_buffer.clear
    @current_player, @next_player = @sente, @gote
    @sente.game = self
    @gote.game  = self

    @last_move = ""
    @current_turn = 0

    @sente.status = "agree_waiting"
    @gote.status  = "agree_waiting"

    @game_id = sprintf("%s+%s+%s+%s+%s", 
                  LEAGUE.event, @game_name, 
                  @sente.name, @gote.name, issue_current_time)
    
    now = Time.now
    log_dir_name = File.join(LEAGUE.dir, 
                             now.strftime("%Y"),
                             now.strftime("%m"),
                             now.strftime("%d"))
    FileUtils.mkdir_p(log_dir_name) unless File.exist?(log_dir_name)
    @logfile = File.join(log_dir_name, @game_id + ".csa")

    LEAGUE.games[@game_id] = self

    log_message(sprintf("game created %s", @game_id))

    @board = Board::new
    @board.initial
    @start_time = nil
    @fh = open(@logfile, "w")
    @fh.sync = true
    @result = nil

    propose
  end
  attr_accessor :game_name, :total_time, :byoyomi, :sente, :gote, :game_id, :board, :current_player, :next_player, :fh, :monitors
  attr_accessor :last_move, :current_turn
  attr_reader   :result

  def rated?
    @sente.rated? && @gote.rated?
  end

  def turn?(player)
    return player.status == "game" && @current_player == player
  end

  def monitoron(monitor)
    @monitors.delete(monitor)
    @monitors.push(monitor)
  end

  def monitoroff(monitor)
    @monitors.delete(monitor)
  end

  def each_monitor
    @monitors.each do |monitor|
      yield monitor
    end
  end

  def log_game(str)
    if @fh.closed?
      log_error("Failed to write to Game[%s]'s log file: %s" %
                [@game_id, str])
    end
    @fh.printf("%s\n", str)
  end

  def reject(rejector)
    @sente.write_safe(sprintf("REJECT:%s by %s\n", @game_id, rejector))
    @gote.write_safe(sprintf("REJECT:%s by %s\n", @game_id, rejector))
    finish
  end

  def kill(killer)
    if ["agree_waiting", "start_waiting"].include?(@sente.status)
      reject(killer.name)
    elsif (@current_player == killer)
      result = GameResultAbnormalWin.new(self, @next_player, @current_player)
      result.process
      finish
    end
  end

  def finish
    log_message(sprintf("game finished %s", @game_id))
    @fh.printf("'$END_TIME:%s\n", Time::new.strftime("%Y/%m/%d %H:%M:%S"))    
    @fh.close

    @sente.game = nil
    @gote.game = nil
    @sente.status = "connected"
    @gote.status = "connected"

    if (@current_player.protocol == LoginCSA::PROTOCOL)
      @current_player.finish
    end
    if (@next_player.protocol == LoginCSA::PROTOCOL)
      @next_player.finish
    end
    @monitors = Array::new
    @sente = nil
    @gote = nil
    @current_player = nil
    @next_player = nil
    LEAGUE.games.delete(@game_id)
  end

  # class Game
  def handle_one_move(str, player)
    unless turn?(player)
      return false if str == :timeout

      @fh.puts("'Deferred %s" % [str])
      log_warning("Deferred a move [%s] scince it is not %s 's turn." %
                  [str, player.name])
      player.socket_buffer << str # always in the player's thread
      return nil
    end

    finish_flag = true
    @end_time = Time::new
    t = [(@end_time - @start_time).floor, Least_Time_Per_Move].max
    
    move_status = nil
    if ((@current_player.mytime - t <= -@byoyomi) && 
        ((@total_time > 0) || (@byoyomi > 0)))
      status = :timeout
    elsif (str == :timeout)
      return false            # time isn't expired. players aren't swapped. continue game
    else
      @current_player.mytime -= t
      if (@current_player.mytime < 0)
        @current_player.mytime = 0
      end

      move_status = @board.handle_one_move(str, @sente == @current_player)

      if [:illegal, :uchifuzume, :oute_kaihimore].include?(move_status)
        @fh.printf("'ILLEGAL_MOVE(%s)\n", str)
      else
        if [:normal, :outori, :sennichite, :oute_sennichite_sente_lose, :oute_sennichite_gote_lose].include?(move_status)
          # Thinking time includes network traffic
          @sente.write_safe(sprintf("%s,T%d\n", str, t))
          @gote.write_safe(sprintf("%s,T%d\n", str, t))
          @fh.printf("%s\nT%d\n", str, t)
          @last_move = sprintf("%s,T%d", str, t)
          @current_turn += 1
        end

        @monitors.each do |monitor|
          monitor.write_safe(show.gsub(/^/, "##[MONITOR][#{@game_id}] "))
          monitor.write_safe(sprintf("##[MONITOR][%s] +OK\n", @game_id))
        end
      end
    end

    result = nil
    if (@next_player.status != "game") # rival is logout or disconnected
      result = GameResultAbnormalWin.new(self, @current_player, @next_player)
    elsif (status == :timeout)
      # current_player losed
      result = GameResultTimeoutWin.new(self, @next_player, @current_player)
    elsif (move_status == :illegal)
      result = GameResultIllegalMoveWin.new(self, @next_player, @current_player)
    elsif (move_status == :kachi_win)
      result = GameResultKachiWin.new(self, @current_player, @next_player)
    elsif (move_status == :kachi_lose)
      result = GameResultIllegalKachiWin.new(self, @next_player, @current_player)
    elsif (move_status == :toryo)
      result = GameReulstToryoWin.new(self, @next_player, @current_player)
    elsif (move_status == :outori)
      # The current player captures the next player's king
      result = GameResultOutoriWin.new(self, @current_player, @next_player)
    elsif (move_status == :oute_sennichite_sente_lose)
      result = GameResultOuteSennichiteWin.new(self, @gote, @sente) # Sente is checking
    elsif (move_status == :oute_sennichite_gote_lose)
      result = GameResultOuteSennichiteWin.new(self, @sente, @gote) # Gote is checking
    elsif (move_status == :sennichite)
      result = GameResultSennichiteDraw.new(self, @current_player, @next_player)
    elsif (move_status == :uchifuzume)
      # the current player losed
      result = GameResultUchifuzumeWin.new(self, @next_player, @current_player)
    elsif (move_status == :oute_kaihimore)
      # the current player losed
      result = GameResultOuteKaihiMoreWin.new(self, @next_player, @current_player)
    else
      finish_flag = false
    end
    result.process if result
    finish() if finish_flag
    @current_player, @next_player = @next_player, @current_player
    @start_time = Time::new
    return finish_flag
  end

  def start
    log_message(sprintf("game started %s", @game_id))
    @sente.write_safe(sprintf("START:%s\n", @game_id))
    @gote.write_safe(sprintf("START:%s\n", @game_id))
    @sente.mytime = @total_time
    @gote.mytime = @total_time
    @start_time = Time::new
  end

  def propose
    @fh.puts("V2")
    @fh.puts("N+#{@sente.name}")
    @fh.puts("N-#{@gote.name}")
    @fh.puts("$EVENT:#{@game_id}")

    @sente.write_safe(propose_message("+"))
    @gote.write_safe(propose_message("-"))

    now = Time::new.strftime("%Y/%m/%d %H:%M:%S")
    @fh.puts("$START_TIME:#{now}")
    @fh.print <<EOM
P1-KY-KE-GI-KI-OU-KI-GI-KE-KY
P2 * -HI *  *  *  *  * -KA * 
P3-FU-FU-FU-FU-FU-FU-FU-FU-FU
P4 *  *  *  *  *  *  *  *  * 
P5 *  *  *  *  *  *  *  *  * 
P6 *  *  *  *  *  *  *  *  * 
P7+FU+FU+FU+FU+FU+FU+FU+FU+FU
P8 * +KA *  *  *  *  * +HI * 
P9+KY+KE+GI+KI+OU+KI+GI+KE+KY
+
EOM
  end

  def show()
    str0 = <<EOM
BEGIN Game_Summary
Protocol_Version:1.1
Protocol_Mode:Server
Format:Shogi 1.0
Declaration:Jishogi 1.1
Game_ID:#{@game_id}
Name+:#{@sente.name}
Name-:#{@gote.name}
Rematch_On_Draw:NO
To_Move:+
BEGIN Time
Time_Unit:1sec
Total_Time:#{@total_time}
Byoyomi:#{@byoyomi}
Least_Time_Per_Move:#{Least_Time_Per_Move}
Remaining_Time+:#{@sente.mytime}
Remaining_Time-:#{@gote.mytime}
Last_Move:#{@last_move}
Current_Turn:#{@current_turn}
END Time
BEGIN Position
EOM

    str1 = <<EOM
END Position
END Game_Summary
EOM

    return str0 + @board.to_s + str1
  end

  def propose_message(sg_flag)
    str = <<EOM
BEGIN Game_Summary
Protocol_Version:1.1
Protocol_Mode:Server
Format:Shogi 1.0
Declaration:Jishogi 1.1
Game_ID:#{@game_id}
Name+:#{@sente.name}
Name-:#{@gote.name}
Your_Turn:#{sg_flag}
Rematch_On_Draw:NO
To_Move:+
BEGIN Time
Time_Unit:1sec
Total_Time:#{@total_time}
Byoyomi:#{@byoyomi}
Least_Time_Per_Move:#{Least_Time_Per_Move}
END Time
BEGIN Position
P1-KY-KE-GI-KI-OU-KI-GI-KE-KY
P2 * -HI *  *  *  *  * -KA * 
P3-FU-FU-FU-FU-FU-FU-FU-FU-FU
P4 *  *  *  *  *  *  *  *  * 
P5 *  *  *  *  *  *  *  *  * 
P6 *  *  *  *  *  *  *  *  * 
P7+FU+FU+FU+FU+FU+FU+FU+FU+FU
P8 * +KA *  *  *  *  * +HI * 
P9+KY+KE+GI+KI+OU+KI+GI+KE+KY
P+
P-
+
END Position
END Game_Summary
EOM
    return str
  end
  
  private
  
  def issue_current_time
    time = Time::new.strftime("%Y%m%d%H%M%S").to_i
    @@mutex.synchronize do
      while time <= @@time do
        time += 1
      end
      @@time = time
    end
  end
end
end # module ShogiServer

#################################################
# MAIN
#

def usage
    print <<EOM
NAME
        shogi-server - server for CSA server protocol

SYNOPSIS
        shogi-server [OPTIONS] event_name port_number

DESCRIPTION
        server for CSA server protocol

OPTIONS
        --pid-file file
                specify filename for logging process ID
        --daemon dir
                run as a daemon. Log files will be put in dir.

LICENSE
        this file is distributed under GPL version2 and might be compiled by Exerb

SEE ALSO

RELEASE
        #{ShogiServer::Release}

REVISION
        #{ShogiServer::Revision}
EOM
end

def log_debug(str)
  $logger.debug(str)
end

def log_message(str)
  $logger.info(str)
end

def log_warning(str)
  $logger.warn(str)
end

def log_error(str)
  $logger.error(str)
end


def parse_command_line
  options = Hash::new
  parser = GetoptLong.new(
    ["--daemon",   GetoptLong::REQUIRED_ARGUMENT],
    ["--pid-file", GetoptLong::REQUIRED_ARGUMENT])
  parser.quiet = true
  begin
    parser.each_option do |name, arg|
      name.sub!(/^--/, '')
      options[name] = arg.dup
    end
  rescue
    usage
    raise parser.error_message
  end
  return options
end

def write_pid_file(file)
  open(file, "w") do |fh|
    fh.puts "#{$$}"
  end
end

def mutex_watchdog(mutex, sec)
  while true
    begin
      timeout(sec) do
        begin
          mutex.lock
        ensure
          mutex.unlock
        end
      end
      sleep(sec)
    rescue TimeoutError
      log_error("mutex watchdog timeout")
      exit(1)
    end
  end
end

def login_loop(client)
  player = login = nil
 
  while r = select([client], nil, nil, ShogiServer::Login_Time) do
    break unless str = r[0].first.gets
    $mutex.lock # guards LEAGUE
    begin
      str =~ /([\r\n]*)$/
      eol = $1
      if (ShogiServer::Login::good_login?(str))
        player = ShogiServer::Player::new(str, client, eol)
        login  = ShogiServer::Login::factory(str, player)
        if (current_player = LEAGUE.find(player.name))
          if (current_player.password == player.password &&
              current_player.status != "game")
            log_message(sprintf("user %s login forcely", player.name))
            current_player.kill
          else
            login.incorrect_duplicated_player(str)
            player = nil
            break
          end
        end
        LEAGUE.add(player)
        break
      else
        client.write("LOGIN:incorrect" + eol)
        client.write("type 'LOGIN name password' or 'LOGIN name password x1'" + eol) if (str.split.length >= 4)
      end
    ensure
      $mutex.unlock
    end
  end                       # login loop
  return [player, login]
end

def main

  $mutex = Mutex::new
  Thread::start do
    Thread.pass
    mutex_watchdog($mutex, 10)
  end

  $options = parse_command_line
  if (ARGV.length != 2)
    usage
    exit 2
  end

  LEAGUE.event = ARGV.shift
  port = ARGV.shift

  dir = $options["daemon"]
  dir = File.expand_path(dir) if dir
  if dir && ! File.exist?(dir)
    FileUtils.mkdir(dir)
  end
  log_file = dir ? File.join(dir, "shogi-server.log") : STDOUT
  $logger = WEBrick::Log.new(log_file) # thread safe

  LEAGUE.dir = dir || File.dirname(__FILE__)
  LEAGUE.setup_players_database

  config = {}
  config[:Port]       = port
  config[:ServerType] = WEBrick::Daemon if $options["daemon"]
  config[:Logger]     = $logger
  if $options["pid-file"]
    pid_file = File.expand_path($options["pid-file"])
    config[:StartCallback] = Proc.new do
      write_pid_file(pid_file)
    end
    config[:StopCallback] = Proc.new do
      FileUtils.rm(pid_file, :force => true)
    end
  end

  server = WEBrick::GenericServer.new(config)
  ["INT", "TERM"].each do |signal| 
    trap(signal) do
      LEAGUE.shutdown
      server.shutdown
    end
  end
  $stderr.puts("server started as a deamon [Revision: #{ShogiServer::Revision}]") if $options["daemon"] 
  log_message("server started [Revision: #{ShogiServer::Revision}]")

  server.start do |client|
      # client.sync = true # this is already set in WEBrick 
      client.setsockopt(Socket::SOL_SOCKET, Socket::SO_KEEPALIVE, true)
        # Keepalive time can be set by /proc/sys/net/ipv4/tcp_keepalive_time
      player, login = login_loop(client) # loop
      next unless player

      log_message(sprintf("user %s login", player.name))
      login.process
      player.run(login.csa_1st_str) # loop
      begin
        $mutex.lock
        if (player.game)
          player.game.kill(player)
        end
        player.finish # socket has been closed
        LEAGUE.delete(player)
        log_message(sprintf("user %s logout", player.name))
      ensure
        $mutex.unlock
      end
  end
end


if ($0 == __FILE__)
  STDOUT.sync = true
  STDERR.sync = true
  TCPSocket.do_not_reverse_lookup = true
  Thread.abort_on_exception = $DEBUG ? true : false

  LEAGUE = ShogiServer::League::new
  main
end