are there any APIs for changing google-talk status?

I want to write an application, which will:

• recieve and send email messages ( I know, I can do it with ActionMailer using RoR )
• chat with my Google+ friends
• change my GoogleTalk (gmail) status

So, when I open my gmail interface, I see list with my contacts on the left side of page. I can open chat with people from this list, I can change status and name (near my little google+ avatar).

Is exists some Google API for changing google-talk status (special message)? Can I do it using some RubyOnRails gems? Thanks.

So, this pretty lines of ruby code ( using xmpp4r gem ), change your google_talk status and send chat_message to your friend. Thank you, @Arkan!

require 'xmpp4r'

# init jabber client
client_jid = Jabber::JID.new( 'your_email@gmail.com' )
client     = Jabber::Client.new( client_jid )
client.connect 'talk.google.com'
client.auth 'your_gmail_password'

# change google_talk status
client.send( Jabber::Presence.new.set_show( :chat ).set_status( 'Your New GoogleTalk status' ) )

# send chat_message to friend
friend  = Jabber::JID.new("your_friend_email@gmail.com")    
message = Jabber::Message::new(friend, "it's chat message").set_type(:normal).set_id('1')
client.send(message)

I love ruby ^_^ !