#!/usr/bin/env ruby
=begin

# tig.rb

Ruby version of TwitterIrcGateway
( http://www.misuzilla.org/dist/net/twitterircgateway/ )

## Launch

	$ ruby tig.rb # daemonized

If you want to help:

	$ ruby tig.rb --help

## Configuration

Options specified by after irc realname.

Configuration example for Tiarra ( http://coderepos.org/share/wiki/Tiarra ).

	twitter {
		host: localhost
		port: 16668
		name: username@example.com athack jabber=username@example.com:jabberpasswd
		password: password on Twitter
		in-encoding: utf8
		out-encoding: utf8
	}

### athack

If `athack` client option specified,
all nick in join message is leading with @.

So if you complemente nicks (ex. Irssi),
it's good for Twitter like reply command (@nick).

In this case, you will see torrent of join messages after connected,
because NAMES list can't send @ leading nick (it interpreted op.)

### jabber=<jid>:<pass>

If `jabber=<jid>:<pass>` option specified,
use jabber to get friends timeline.

You must setup im notifing settings in the site and
install 'xmpp4r-simple' gem.

	$ sudo gem install xmpp4r-simple

Be careful for managing password.


## Licence

Ruby's by cho45

=end

$LOAD_PATH << "lib"
$LOAD_PATH << "../lib"

$KCODE = "u" # json use this

require "rubygems"
require "net/irc"
require "net/http"
require "net/https"
require "uri"
require "json"
require "socket"
require "time"
require "logger"
require "yaml"
require "pathname"
require "cgi"

Net::HTTP.version_1_2

class TwitterIrcGateway < Net::IRC::Server::Session
	def server_name
		"twittergw"
	end

	def server_version
		"0.0.0"
	end

	def main_channel
		"#twitter"
	end

	def api_base
		URI("http://twitter.com/")
	end

	def api_source
		"tigrb"
	end

	def jabber_bot_id
		"twitter@twitter.com"
	end

	class ApiFailed < StandardError; end

	def initialize(*args)
		super
		@groups     = {}
		@channels   = [] # joined channels (groups)
		@user_agent = "#{self.class}/#{server_version} (tig.rb)"
		@config     = Pathname.new(ENV["HOME"]) + ".tig"
		@map        = nil
		load_config
	end

	def on_user(m)
		super
		post @prefix, JOIN, main_channel
		post server_name, MODE, main_channel, "+o", @prefix.nick

		@real, *@opts = @opts.name || @real.split(/\s+/)
		@opts ||= []
		@tmap   = TypableMap.new

		jabber = @opts.find {|i| i =~ /^jabber=(\S+?):(\S+)/ }
		if jabber
			jid, pass = Regexp.last_match.captures
			jabber.replace("jabber=#{jid}:********")
			if jabber_bot_id
				begin
					require "xmpp4r-simple"
					start_jabber(jid, pass)
				rescue LoadError
					log "Failed to start Jabber."
					log "Installl 'xmpp4r-simple' gem or check your id/pass."
					finish
				end
			else
				jabber = nil
				log "This gateway does not support Jabber bot."
			end
		end

		@log.info "Client Options: #{@opts.inspect}"

		@timeline = []
		@check_friends_thread = Thread.start do
			loop do
				begin
					check_friends
				rescue ApiFailed => e
					@log.error e.inspect
				rescue Exception => e
					@log.error e.inspect
					e.backtrace.each do |l|
						@log.error "\t#{l}"
					end
				end
				sleep 10 * 60 # 6 times/hour
			end
		end
		sleep 3

		return if jabber

		@check_timeline_thread = Thread.start do
			loop do
				begin
					check_timeline
					# check_direct_messages
				rescue ApiFailed => e
					@log.error e.inspect
				rescue Exception => e
					@log.error e.inspect
					e.backtrace.each do |l|
						@log.error "\t#{l}"
					end
				end
				sleep 180 # 20 times/hour
			end
		end
	end

	def on_disconnected
		@check_friends_thread.kill  rescue nil
		@check_timeline_thread.kill rescue nil
		@im_thread.kill             rescue nil
		@im.disconnect              rescue nil
	end

	def on_privmsg(m)
		return on_ctcp(m[0], ctcp_decoding(m[1])) if m.ctcp?
		retry_count = 3
		ret = nil
		target, message = *m.params
		begin
			if target =~ /^#/
				if @im && @im.connected? # in jabber mode, using jabber post
					ret = @im.deliver(jabber_bot_id, message)
					post "#{nick}!#{nick}@#{api_base.host}", TOPIC, main_channel, untinyurl(message)
				else
					ret = api("statuses/update", {"status" => message})
				end
			else
				# direct message
				ret = api("direct_messages/new", {"user" => target, "text" => message})
			end
			raise ApiFailed, "api failed" unless ret
			log "Status Updated"
		rescue => e
			@log.error [retry_count, e.inspect].inspect
			if retry_count > 0
				retry_count -= 1
				@log.debug "Retry to setting status..."
				retry
			else
				log "Some Error Happened on Sending #{message}. #{e}"
			end
		end
	end

	def on_ctcp(target, message)
		_, command, *args = message.split(/\s+/)
		case command
		when "list"
			nick = args[0]
			@log.debug([ nick, message ])
			res = api('statuses/user_timeline', { 'id' => nick }).reverse_each do |s|
				@log.debug(s)
				post nick, NOTICE, main_channel, "#{generate_status_message(s)}"
			end

			unless res
				post nil, ERR_NOSUCHNICK, nick, "No such nick/channel" 
			end
		when "fav"
			tid = args[0]
			id  = @tmap[tid]
			if id
				res = api("favorites/create/#{id}", {})
				post nil, NOTICE, main_channel, "Fav: #{res["screen_name"]}: #{res["text"]}"
			else
				post nil, NOTICE, main_channel, "No such id #{tid}"
			end
		end
	rescue ApiFailed => e
		log e.inspect
	end

	def on_whois(m)
		nick = m.params[0]
		f = (@friends || []).find {|i| i["screen_name"] == nick }
		if f
			post nil, RPL_WHOISUSER,   @nick, nick, nick, api_base.host, "*", "#{f["name"]} / #{f["description"]}"
			post nil, RPL_WHOISSERVER, @nick, nick, api_base.host, api_base.to_s
			post nil, RPL_WHOISIDLE,   @nick, nick, "0", "seconds idle"
			post nil, RPL_ENDOFWHOIS,  @nick, nick, "End of WHOIS list"
		else
			post nil, ERR_NOSUCHNICK, nick, "No such nick/channel"
		end
	end

	def on_who(m)
		channel = m.params[0]
		case
		when channel == main_channel
			#     "<channel> <user> <host> <server> <nick>
			#         ( "H" / "G" > ["*"] [ ( "@" / "+" ) ]
			#             :<hopcount> <real name>"
			@friends.each do |f|
				user = nick = f["screen_name"]
				host = serv = api_base.host
				real = f["name"]
				post nil, RPL_WHOREPLY, @nick, channel, user, host, serv, nick, "H*@", "0 #{real}"
			end
			post nil, RPL_ENDOFWHO, @nick, channel
		when @groups.key?(channel)
			@groups[channel].each do |name|
				f = @friends.find {|i| i["screen_name"] == name }
				user = nick = f["screen_name"]
				host = serv = api_base.host
				real = f["name"]
				post nil, RPL_WHOREPLY, @nick, channel, user, host, serv, nick, "H*@", "0 #{real}"
			end
			post nil, RPL_ENDOFWHO, @nick, channel
		else
			post nil, ERR_NOSUCHNICK, @nick, nick, "No such nick/channel"
		end
	end

	def on_join(m)
		channels = m.params[0].split(/\s*,\s*/)
		channels.each do |channel|
			next if channel == main_channel

			@channels << channel
			@channels.uniq!
			post "#{@nick}!#{@nick}@#{api_base.host}", JOIN, channel
			post server_name, MODE, channel, "+o", @nick
			save_config
		end
	end

	def on_part(m)
		channel = m.params[0]
		return if channel == main_channel

		@channels.delete(channel)
		post @nick, PART, channel, "Ignore group #{channel}, but setting is alive yet."
	end

	def on_invite(m)
		nick, channel = *m.params
		return if channel == main_channel

		if (@friends || []).find {|i| i["screen_name"] == nick }
			((@groups[channel] ||= []) << nick).uniq!
			post "#{nick}!#{nick}@#{api_base.host}", JOIN, channel
			post server_name, MODE, channel, "+o", nick
			save_config
		else
			post ERR_NOSUCHNICK, nil, nick, "No such nick/channel"
		end
	end

	def on_kick(m)
		channel, nick, mes = *m.params
		return if channel == main_channel

		if (@friends || []).find {|i| i["screen_name"] == nick }
			(@groups[channel] ||= []).delete(nick)
			post nick, PART, channel
			save_config
		else
			post ERR_NOSUCHNICK, nil, nick, "No such nick/channel"
		end
	end

	private
	def check_timeline
		@prev_time ||= Time.at(0)
		api("statuses/friends_timeline", {"since" => @prev_time.httpdate}).reverse_each do |s|
			id = s["id"] || s["rid"]
			next if id.nil? || @timeline.include?(id)
			@timeline << id
			nick = s["user_login_id"] || s["user"]["screen_name"] # it may be better to use user_login_id in Wassr
			mesg = generate_status_message(s)

			tid = @tmap.push(id)

			@log.debug [id, nick, mesg]
			if nick == @nick # 自分のときは topic に
				post "#{nick}!#{nick}@#{api_base.host}", TOPIC, main_channel, untinyurl(mesg)
			else
				message(nick, main_channel, "%s [%s]" % [mesg, tid])
			end
			@groups.each do |channel, members|
				if members.include?(nick)
					message(nick, channel, "%s [%s]" % [mesg, tid])
				end
			end
		end
		@log.debug "@timeline.size = #{@timeline.size}"
		@timeline  = @timeline.last(100)
		@prev_time = Time.now
	end

	def generate_status_message(status)
		s = status
		mesg = s["text"]
		@log.debug(mesg)

		# added @user in no use @user reply message ( Wassr only )
		if s.has_key?('reply_status_url') and s['reply_status_url'] and s['text'] !~ /^@.*/ and %r{([^/]+)/statuses/[^/]+}.match(s['reply_status_url'])
			reply_user_id = $1
			mesg = "@#{reply_user_id} #{mesg}"
		end
		# display area name(Wassr only)
		if s.has_key?('areaname') and s["areaname"]
			mesg += " L: #{s['areaname']}"
		end
		# display photo url(Wassr only)
		if s.has_key?('photo_url') and s["photo_url"]
			mesg += " #{s['photo_url']}"
		end

		# time = Time.parse(s["created_at"]) rescue Time.now
		m = { "&quot;" => "\"", "&lt;"=> "<", "&gt;"=> ">", "&amp;"=> "&", "\n" => " "}
		mesg.gsub!(/(#{m.keys.join("|")})/) { m[$1] }
		mesg
	end

	def check_direct_messages
		@prev_time_d ||= Time.now
		api("direct_messages", {"since" => @prev_time_d.httpdate}).reverse_each do |s|
			nick = s["sender_screen_name"]
			mesg = s["text"]
			time = Time.parse(s["created_at"])
			@log.debug [nick, mesg, time].inspect
			message(nick, @nick, mesg)
		end
		@prev_time_d = Time.now
	end

	def check_friends
		first = true unless @friends
		@friends ||= []
		friends = api("statuses/friends")
		if first && !@opts.include?("athack")
			@friends = friends
			post nil, RPL_NAMREPLY,   @nick, "=", main_channel, @friends.map{|i| "@#{i["screen_name"]}" }.join(" ")
			post nil, RPL_ENDOFNAMES, @nick, main_channel, "End of NAMES list"
		else
			prv_friends = @friends.map {|i| i["screen_name"] }
			now_friends = friends.map {|i| i["screen_name"] }

			# twitter api bug?
			return if !first && (now_friends.length - prv_friends.length).abs > 10

			(now_friends - prv_friends).each do |join|
				join = "@#{join}" if @opts.include?("athack")
				post "#{join}!#{join}@#{api_base.host}", JOIN, main_channel
			end
			(prv_friends - now_friends).each do |part|
				part = "@#{part}" if @opts.include?("athack")
				post "#{part}!#{part}@#{api_base.host}", PART, main_channel, ""
			end
			@friends = friends
		end
	end

	def start_jabber(jid, pass)
		@log.info "Logging-in with #{jid} -> jabber_bot_id: #{jabber_bot_id}"
		@im = Jabber::Simple.new(jid, pass)
		@im.add(jabber_bot_id)
		@im_thread = Thread.start do
			loop do
				begin
					@im.received_messages.each do |msg|
						@log.debug [msg.from, msg.body]
						if msg.from.strip == jabber_bot_id
							# Twitter -> 'id: msg'
							# Wassr   -> 'nick(id): msg'
							body = msg.body.sub(/^(.+?)(?:\((.+?)\))?: /, "")
							if Regexp.last_match
								nick, id = Regexp.last_match.captures
								body = CGI.unescapeHTML(body)
								message(id || nick, main_channel, body)
							end
						end
					end
				rescue Exception => e
					@log.error "Error on Jabber loop: #{e.inspect}"
					e.backtrace.each do |l|
						@log.error "\t#{l}"
					end
				end
				sleep 1
			end
		end
	end

	def save_config
		config = {
			:channels => @channels,
			:groups   => @groups,
		}
		@config.open("w") do |f|
			YAML.dump(config, f)
		end
	end

	def load_config
		@config.open do |f|
			config = YAML.load(f)
			@channels = config[:channels]
			@groups   = config[:groups]
		end
	rescue Errno::ENOENT
	end

	def api(path, q={})
		ret     = {}
		header = {
			"User-Agent"               => @user_agent,
			"Authorization"            => "Basic " + ["#{@real}:#{@pass}"].pack("m"),
			"X-Twitter-Client"         => api_source,
			"X-Twitter-Client-Version" => server_version,
			"X-Twitter-Client-URL"     => "http://coderepos.org/share/browser/lang/ruby/misc/tig.rb",
		}
		header["If-Modified-Since"]    =  q["since"] if q.key?("since")

		q["source"] ||= api_source
		q = q.inject([]) {|r,(k,v)| v.inject(r) {|r,i| r << "#{k}=#{URI.escape(i, /[^-.!~*'()\w]/n)}" } }.join("&")

		uri = api_base.dup
		uri.path  = path.sub(%r{^/*}, "/") << ".json"
		uri.query = q

		@log.debug uri.inspect
		http = Net::HTTP.new(uri.host, uri.port)
		if uri.scheme == "https"
			http.use_ssl     = true
			http.verify_mode = OpenSSL::SSL::VERIFY_NONE # FIXME
		end
		http.start do
			case uri.path
			when "/statuses/update.json", "/direct_messages/new.json"
				ret = http.post(uri.request_uri, q, header)
			else
				ret = http.get(uri.request_uri, header)
			end
		end

		case ret
		when Net::HTTPOK # 200
			ret = JSON.parse(ret.body.gsub(/'(y(?:es)?|no?|true|false|null)'/, '"\1"'))
			raise ApiFailed, "Server Returned Error: #{ret["error"]}" if ret.kind_of?(Hash) && ret["error"]
			ret
		when Net::HTTPNotModified # 304
			[]
		when Net::HTTPBadRequest # 400
			# exceeded the rate limitation
			raise ApiFailed, "#{ret.code}: #{ret["error"]}"
		else
			raise ApiFailed, "Server Returned #{ret.code} #{ret.message}"
		end
	rescue Errno::ETIMEDOUT, JSON::ParserError, IOError, Timeout::Error, Errno::ECONNRESET => e
		raise ApiFailed, e.inspect
	end

	def message(sender, target, str)
#		str.gsub!(/&#(x)?([0-9a-f]+);/i) do
#			[$1 ? $2.hex : $2.to_i].pack("U")
#		end
		str    = untinyurl(str)
		sender = "#{sender}!#{sender}@#{api_base.host}"
		post sender, PRIVMSG, target, str
	end

	def log(str)
		str.gsub!(/\n/, " ")
		post server_name, NOTICE, main_channel, str
	end

	def untinyurl(text)
		text.gsub(%r|http://(preview\.)?tinyurl\.com/[0-9a-z=]+|i) {|m|
			uri = URI(m)
			uri.host = uri.host.sub($1, "") if $1
			Net::HTTP.start(uri.host, uri.port) {|http|
				http.open_timeout = 3
				begin
					http.head(uri.request_uri, { "User-Agent" => @user_agent })["Location"] || m
				rescue Timeout::Error
					m
				end
			}
		}
	end

	class TypableMap < Hash
		Roma = "a i u e o k g s z t d n h b p m y r w j v l q".split(/ /).map {|k|
			%w|a i u e o|.map {|v| "#{k}#{v}" }
		}.flatten

		def initialize(size=2)
			@seq = Roma
			@map = {}
			@n   = 0
			@size = size
		end

		def generate(n)
			ret = []
			begin
				n, r = n.divmod(@seq.size)
				ret << @seq[r]
			end while n > 0
			ret.reverse.join
		end

		def push(obj)
			id = generate(@n)
			self[id] = obj
			@n += 1
			@n = @n % (@seq.size ** @size)
			id
		end
		alias << push

		def clear
			@n = 0
			super
		end

		private :[]=
		undef update, merge, merge!, replace
	end


end

if __FILE__ == $0
	require "optparse"

	opts = {
		:port  => 16668,
		:host  => "localhost",
		:log   => nil,
		:debug => false,
		:foreground => false,
	}

	OptionParser.new do |parser|
		parser.instance_eval do
			self.banner  = <<-EOB.gsub(/^\t+/, "")
				Usage: #{$0} [opts]

			EOB

			separator ""

			separator "Options:"
			on("-p", "--port [PORT=#{opts[:port]}]", "port number to listen") do |port|
				opts[:port] = port
			end

			on("-h", "--host [HOST=#{opts[:host]}]", "host name or IP address to listen") do |host|
				opts[:host] = host
			end

			on("-l", "--log LOG", "log file") do |log|
				opts[:log] = log
			end

			on("--debug", "Enable debug mode") do |debug|
				opts[:log]   = $stdout
				opts[:debug] = true
			end

			on("-f", "--foreground", "run foreground") do |foreground|
				opts[:log]        = $stdout
				opts[:foreground] = true
			end

			on("-n", "--name [user name or email address]") do |name|
				opts[:name] = name
			end

			parse!(ARGV)
		end
	end

	opts[:logger] = Logger.new(opts[:log], "daily")
	opts[:logger].level = opts[:debug] ? Logger::DEBUG : Logger::INFO

	def daemonize(foreground=false)
		trap("SIGINT")  { exit! 0 }
		trap("SIGTERM") { exit! 0 }
		trap("SIGHUP")  { exit! 0 }
		return yield if $DEBUG || foreground
		Process.fork do
			Process.setsid
			Dir.chdir "/"
			File.open("/dev/null") {|f|
				STDIN.reopen  f
				STDOUT.reopen f
				STDERR.reopen f
			}
			yield
		end
		exit! 0
	end

	daemonize(opts[:debug] || opts[:foreground]) do
		Net::IRC::Server.new(opts[:host], opts[:port], TwitterIrcGateway, opts).start
	end
end

# Local Variables:
# coding: utf-8
# End: