#! /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

TOP_DIR = File.expand_path(File.dirname(__FILE__))
$:.unshift File.dirname(__FILE__)
require 'shogi_server'

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

ShogiServer.reload

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("gets_safe: #{ex.class}: #{ex.message}\n\t#{ex.backtrace[0]}")
  return :exception
end

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.
        --player-log-dir dir
                log network messages for each player. Log files
                will be put in the dir.

LICENSE
	GPL versoin 2 or later

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],
    ["--player-log-dir", 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)
  sec = 1 if sec < 1
  queue = []
  while true
    if mutex.try_lock
      queue.clear
      mutex.unlock
    else
      queue.push(Object.new)
      if queue.size > sec
        # timeout
        log_error("mutex watchdog timeout: %d sec" % [sec])
        queue.clear
      end
    end
    sleep(1)
  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 setup_logger(log_file)
  logger = Logger.new(log_file, 'daily')
  logger.formatter = ShogiServer::Formatter.new
  logger.level = $DEBUG ? Logger::DEBUG : Logger::INFO  
  logger.datetime_format = "%Y-%m-%d %H:%M:%S"
  return logger
end

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

def setup_floodgate
  return Thread.start do 
    Thread.pass
    floodgate = ShogiServer::League::Floodgate.new(LEAGUE)
    log_message("Flooddgate reloaded. The next match will start at %s." % 
                [floodgate.next_time])

    while (true)
      begin
        diff = floodgate.next_time - Time.now
        if diff > 0
          sleep(diff/2)
          next
        end
        LEAGUE.reload
        floodgate.match_game
        floodgate.charge
        next_time = floodgate.next_time
        $mutex.synchronize do
          log_message("Reloading source...")
          ShogiServer.reload
        end
        floodgate = ShogiServer::League::Floodgate.new(LEAGUE, next_time)
        log_message("Floodgate will start the next match at %s." % 
                    [floodgate.next_time])
      rescue Exception => ex 
        # ignore errors
        log_error("[in Floodgate's thread] #{ex} #{ex.backtrace}")
      end
    end
  end
end

def main
  
  $options = parse_command_line
  if (ARGV.length != 2)
    usage
    exit 2
  end
  if $options["player-log-dir"]
    $options["player-log-dir"] = File.expand_path($options["player-log-dir"])
  end
  if $options["player-log-dir"] && 
     !File.directory?($options["player-log-dir"])
    usage
    exit 3
  end
  if $options["pid-file"] 
    $options["pid-file"] = File.expand_path($options["pid-file"])
  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 = setup_logger(log_file)

  LEAGUE.dir = dir || TOP_DIR

  config = {}
  config[:Port]       = port
  config[:ServerType] = WEBrick::Daemon if $options["daemon"]
  config[:Logger]     = $logger

  fg_thread = nil

  config[:StartCallback] = Proc.new do
    srand
    if $options["pid-file"]
      write_pid_file($options["pid-file"])
    end
    setup_watchdog_for_giant_lock
    LEAGUE.setup_players_database
    fg_thread = setup_floodgate
  end

  config[:StopCallback] = Proc.new do
    if $options["pid-file"]
      FileUtils.rm($options["pid-file"], :force => true)
    end
  end

  server = WEBrick::GenericServer.new(config)
  ["INT", "TERM"].each do |signal| 
    trap(signal) do
      server.shutdown
      fg_thread.kill if fg_thread
    end
  end
  trap("HUP") do
    Dependencies.clear
  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.setup_logger($options["player-log-dir"]) if $options["player-log-dir"]
      player.run(login.csa_1st_str) # loop
      $mutex.lock
      begin
        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

  begin
    LEAGUE = ShogiServer::League.new(TOP_DIR)
    main
  rescue Exception => ex
    log_error("main: #{ex.class}: #{ex.message}\n\t#{ex.backtrace[0]}")
  end
end