window._lang = window._lang || "default" ;
window._l10s = window._l10s || { } ;
window._l10s[_lang] = window._l10s[_lang] || { }

function _(string_to_localize) {
  var args = [ ] ;
  var string_to_localize = arguments[0] ;
  for(var i=1 ; i<arguments.length ; i++) {
    args.push( arguments[i] ) ;
  }
  var translated = _l10s[_lang][string_to_localize] || string_to_localize
  if ( typeof(translated)=='function' ) { return translated.apply(window,args) ; }
  if ( typeof(translated)=='array' ) {
    if (translated.length == 3) {
      translated = translated[args[0]==0 ? 0 : (args[0]>1 ? 2 : 1)] ;
    } else {
      translated = translated[args[0]>1 ? 1 : 0] ;
    }
  }
  return translated.interpolate(args) ;
}

function show_dates_as_local_time() {
  $$('span.typo_date').each(function(e){
    var classname = e.className ;
    var gmtdate = '' ;
    res = classname.match( /gmttimestamp-(\d+)/ ) ;
    if (!res) {
      gmtdate = e.title ;
    } else {
      gmtdate = new Date() ;
      gmtdate.setTime( parseInt(res[1]) * 1000 )  ;
    }
    e.update(get_local_time_for_date(gmtdate))
  })
}

function get_local_time_for_date(time) {
  if (typeof(time)=='date') {
    system_date = time ;
  } else {
    system_date = new Date(time);
  }
  user_date = new Date();
  delta_minutes = Math.floor((user_date - system_date) / (60 * 1000));
  if (Math.abs(delta_minutes) <= (8*7*24*60)) { // eight weeks... I'm lazy to count days for longer than that
    distance = distance_of_time_in_words(delta_minutes);
    if (delta_minutes < 0) {
      return _("#{0} from now", distance) ;
    } else {
      return _("#{0} ago", distance) ;
    }
  } else {
    return _('on #{0}', system_date.toLocaleDateString());
  }
}

// a vague copy of rails' inbuilt function,
// but a bit more friendly with the hours.
function distance_of_time_in_words(minutes) {
  if (minutes.isNaN) return "";
  minutes = Math.abs(minutes);
  if (minutes < 1) return (_('less than a minute'));
  if (minutes < 50) return (_( '#{0} minute' + (minutes == 1 ? '' : 's'), minutes));
  if (minutes < 90) return (_('about one hour'));
  if (minutes < 1080) return (_("#{0} hours", Math.round(minutes / 60)));
  if (minutes < 1440) return (_('one day'));
  if (minutes < 2880) return (_('about one day'));
  else return (_("#{0} days", Math.round(minutes / 1440))) ;
}