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    my $self = shift;
    return $self->_execute_cmd("getswitchenergy",$self->_ain(shift));
}

=item $power = $aha->power($ain)

Get the current power consumption of the switch C<$ain> in mW.
If the switch is not connected, C<undef> is returned.

=cut

sub power {
    my $self = shift;
    return &_inval_check($self->_execute_cmd("getswitchpower",$self->_ain(shift)));
}

=item $name = $aha->name($ain)

Get the symbolic name for the AIN given. In this case C<$ain> must be an real
AIN.

=cut 

sub name {
    my $self = shift;
    my $ain = shift || die "No AIN given for which to fetch the name"; 
    return $self->_execute_cmd("getswitchname",$ain);
}

=item $ain = $aha->ain($name)

This is the inverse method to C<name()>. It takes a symbolic name C<$name> as
argument and returns the AIN. If no such name is registered, an error is
raised. 

=cut

sub ain_by_name {
    my $self = shift;
    my $name = shift;
    my $map = $self->{ain_map};
    return $map->{$name} if $map->{$name};
    $self->_init_ain_map();
    my $ain = $self->{ain_map}->{$name};
    die "No AIN for '$name' found" unless $ain;
    return $ain;
}

=item $aha->logout()

Logout from the connected fritz.box in order to free up any resources. You 
can still use any other method on this object, in which case it is 
logs in again (which eats up some performance, of course)

=cut

sub logout {
    my $self = shift;
    return unless $self->{sid};

    # Send a post request as defined in 
    # http://www.avm.de/de/Extern/files/session_id/AVM_Technical_Note_-_Session_ID.pdf
    my $req = HTTP::Request->new(POST => $self->{login_url});
    $req->content_type("application/x-www-form-urlencoded");
    my $login = "sid=".$self->{sid}."&security:command/logout=fcn";
    $req->content($login);
    my $resp = $self->{ua}->request($req);
    die "Cannot logout SID ",$self->{sid},": ",$resp->status_line unless $resp->is_success;
    print "--- Logout ",$self->{sid} if $DEBUG;
    delete $self->{sid};
}

=back 



=cut

# ======================================================================
# Private methods

# Decide whether an AIN or a name is given
sub _ain {
    my $self = shift;
    my $ain = shift || die "No AIN or name given";
    return $ain =~ /^\d{12}$/ ? $ain : $self->ain_by_name($ain);
}

# Execute a command as defined in 
# http://www.avm.de/de/Extern/files/session_id/AHA-HTTP-Interface.pdf
sub _execute_cmd {
    my $self = shift;
    my $cmd = shift || die "No command given";
    my $ain = shift;
    my $url = $self->{ws_url} . "?sid=" . $self->_sid() . "&switchcmd=" . $cmd;
    $url .= "&ain=" . $ain if $ain;
    my $resp  = $self->{ua}->get($url);    
    print ">>> $url\n" if $DEBUG;
    die "Cannot execute ",$cmd,": ",$resp->status_line unless $resp->is_success;
    my $c = $resp->content;
    chomp $c;
    print "<<< $c\n" if $DEBUG;
    return $c;
}

# Return the cached SID or perform the login as described in
# http://www.avm.de/de/Extern/files/session_id/AVM_Technical_Note_-_Session_ID.pdf
sub _sid {
    my $self = shift;
    
    return $self->{sid} if $self->{sid};
    
    # Get the challenge
    my $resp = $self->{ua}->get($self->{login_url});
    my $content = $resp->content();

    my $challenge = ($content =~ /<Challenge>(.*?)<\/Challenge>/ && $1);
    my $input = $challenge . '-' . $self->{password};
    Encode::from_to($input, 'ascii', 'utf16le');
    my $challengeresponse = $challenge . '-' . lc(Digest::MD5::md5_hex($input));