Website Messed up and ruined – Don't know what happened… Help?

hello,

My friend’s website running with wp suddenly became like this.. I wonder what’s going on? and if you could give us solutions on how we can fix this that would be awesome.

we haven’t changed anything from the theme and stuff and when we woke up it suddenly became like this.. last week when we checked it was working fine.. until now. help?

thanks.