require 'rubygems'
require 'xmpp4r'
require "iconv"
require "nkf"
require "kconv"
require "uri"

/*
  # in nadokarc (NADOKA_Config)
  BotFiles = [
    'irchat'
  ]

  BotConfig = [
    {
      :name => :irchat,
      :user =>  "server_account@example.com",
      :pass => "please-write-your-password",
      :patterns => ["Trapezoid", "とらぺ", "トラペ" ,"おおたけ", "はると", "悠人", "ハルト"],
      :channels => ["#reply@tig", "trapezoid"],
      :target => "target_device_account@example.com",
    },
  ]
*/

class IRChatMessage
  attr_reader :prefix, :ch, :body
  def initialize(prefix, ch, body)
    @prefix = prefix
    @ch = ch
    @body = body
  end
end

class IRCLog
  attr_reader :data
  def initialize(max_line)
    @max_line = max_line
    @data = []
  end

  def add(message)
    @data.push message
    @data.shift if @data.size > @max_line
  end

  def [](i)
    @data[i]
  end
end

class TypeableMap
  DEFAULT_POINTER = "a"
  def initialize(size = 3)
    super()
    @size = size
    @hash = {}
    @pointer = DEFAULT_POINTER
  end

  def insert(value)
    if @pointer.succ.length > @size then
      @pointer = DEFAULT_POINTER
    else
      @pointer.succ!
    end

    @hash[@pointer] = value
    puts "TypableMap: " + @pointer.to_s + " => " + @hash[@pointer].ch.tosjis + " , " + @hash[@pointer].body.tosjis
  end

  def <<(value)
    insert(value)
    return @pointer
  end

  def [](key)
    @hash[key]
  end

  def last
    [@pointer, @hash[@pointer]]
  end

  def reset
    @hash = {}
    @pointer = DEFAULT_POINTER
  end
end

class IRChat < Nadoka::NDK_Bot
  def connect_jabber(user, password)
    begin
      connection = Jabber::Client.new(Jabber::JID.new(user))
      connection.connect('talk.google.com', 5222)
      connection.auth(password)
      connection.send(Jabber::Presence.new.set_show(:chat))

      connection.add_message_callback do |message|
        params = message.body.split(" ")
        cmd = params.shift

        case cmd
        when "say"
          command_say(params.shift, params.join(" "))
        when "get"
          command_get(params.shift)
        when "join"
          command_join(params.shift)
        when "leave"
          command_leave(params.shift)
        else
          command_default(message.body)
        end
      end

      puts "connected to google talk"

      return connection
    rescue => e
      puts "ExceptionError: in connect_jabber"
      p e
      puts e.backtrace
      return nil
    end
  end

  def jabber
    if (@jabber == nil) || @jabber.is_disconnected?
      puts "reconnecting..."
      @jabber = connect_jabber @user, @password
    end

    @jabber
  end

  def bot_initialize
    @typeable_map = TypeableMap.new
    @pickers = []
    @post_queue = []
    @jabber_queue = []

    @last_msg = nil
    @irclog = Hash.new do |hash, key|
      hash[key] = IRCLog.new(10)
    end

    @jabber_mutex = Mutex.new

    @ch_patterns = []
    @default_ch_patterns = @bot_config[:channels] || []
    @default_patterns = @bot_config[:patterns] || []

    add_picker_callback do |m|
      result = false
      @default_patterns.each do |s|
        pattern = Regexp.new(s, Regexp::IGNORECASE, "s")
        if pattern =~ m.body.tosjis then
          result = true
        end
      end

      result
    end

    add_picker_callback do |m|
      result = false
      @default_ch_patterns.each do |s|
        pattern = Regexp.new(s, Regexp::IGNORECASE, "s")
        if pattern =~ m.ch.tosjis then
          result = true
        end
      end

      result
    end

    add_picker_callback do |m|
      result = false
      @ch_patterns.each do |s|
        pattern = Regexp.new(s, Regexp::IGNORECASE, "s")
        if pattern =~ m.ch.tosjis then
          result = true
        end
      end

      result
    end

    @user, @password = @bot_config[:user], @bot_config[:pass]
    @target = @bot_config[:target] || "target_device_account@example.com"
    @jabber = connect_jabber @user, @password

    puts "irchat loaded"
  end

  def command_leave(ch)
    unless ch
      @ch_patterns = []
      post_jabber(@target, "leave all channels")
      return
    end

    @ch_patterns.delete(ch.tosjis)
    post_jabber(@target, "#{ch.toutf8} leaved.")
  end

  def command_join(ch)
    @ch_patterns.push ch.tosjis unless @ch_patterns.include? ch.tosjis
    post_jabber(@target, "#{ch.toutf8} joined.")
  end

  def command_get(ch)
    log = if @typeable_map[ch] then
      @irclog[@typeable_map[ch].ch]
    else
      @irclog[ch.tosjis]
    end

    if log.data.size == 0 then
      post_jabber(@target, "#{ch.toutf8} channel not found.")
      return
    end

    log.data.each do |message|
      puts message.body.tosjis
      post_jabber(@target, "[#{message.ch.toutf8}]#{message.prefix.nick}: #{message.body.toutf8}")
      sleep(1)
    end
  end

  def command_say(map, body)
    target = if @typeable_map[map] then
      @typeable_map[map].ch.tosjis
    elsif @irclog[map.tosjis].data.size > 0
      map.tosjis
    else
      nil
    end

    if target then
      @post_queue.push IRChatMessage.new("", target, body)
      post_jabber(@target, "send to #{target.toutf8}")
    else
      post_jabber(@target, "invalid typable map.")
    end
  end

  def command_default(body)
    puts "PrePost: #{@last_msg ? @last_msg.ch : "dummy(#twitter@tig)"} / #{body}"
    @post_queue.push IRChatMessage.new("", @last_msg ? @last_msg.ch : "#twitter@tig", body)
  end

  def on_topic(prefix, ch, topic)
    ch = NKF.nkf "-s", ch
    topic = NKF.nkf "-s", topic
  end

  def on_timer(time)
    if @post_queue.size == 0 then
      @post_queue = []
    else
      message = @post_queue.shift
      puts "Post: #{message.ch} / #{message.body}"
      send_privmsg(message.ch, message.body) unless message.body.index(/^\[#/)
    end

    @jabber_mutex.synchronize do
      jabber.send(Jabber::Presence.new.set_show(:chat)) if jabber
    end
  end

  def on_privmsg(prefix, ch, msg)
    ch = NKF.nkf "-s", ch
    msg = NKF.nkf "-s", msg

    message = IRChatMessage.new(prefix, ch, msg)

    if @pickers.any?{|picker| picker.call(message) == true} then
      pointer = (@typeable_map << message)

      unless @last_msg && (@last_msg.body == message.body) && (@last_msg.prefix.nick == message.prefix.nick)
        post_jabber(@target, "[#{message.ch.toutf8}(#{pointer})]\n#{message.prefix.nick}: #{message.body.toutf8}")
      end

      @last_msg = message
    end

    @irclog[ch].add(message)

    on_timer(nil)

    false
  end

  def send_notice(ch, msg)
    super(NKF.nkf("-j",ch), NKF.nkf("-j",msg))
  end

  def send_privmsg(ch, msg)
    super(NKF.nkf("-j",ch), NKF.nkf("-j",msg))
  end

  def post_jabber(to, message)
    jabber_message = Jabber::Message.new(to, message)
    jabber_message.type = :chat

    @jabber_mutex.synchronize do
      puts "post to jabber"
      jabber.send(jabber_message) if jabber
    end
  end

  def add_picker_callback(&picker)
    @pickers << picker
  end
end