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    if (my $cb = $self->on_error) {
        if ($res) {
            $cb->($res->{detail});
        }
        else {
            $cb->($hdr->{Status} . ': ' . $hdr->{Reason});
        }
    }
    else {
        debugf 'on_error callback does not set';
        critf "res:%s hdr:%s", ddf($res), ddf($hdr);
    }
}

sub start_session {
    my ($self) = @_;

    debugf "starting session...";

    if ($self->session) {
        debugf "found old session:%s reusing...", $self->session;

        $self->get('session/verify', { session => $self->session }, sub {
            my ($res, $hdr) = @_;
            return unless $self;

            if ($res and $res->{status} eq 'ok') {
                infof "session verified: %s", $res->{session};
                $self->_get_channels;
            }
            else {
                debugf "session verify failed: %s", ddf($res || $hdr);
                $self->session(undef);
                $self->_on_error($res, $hdr);
            }
        });
    }
    else {
        debugf "create new session...";

        $self->post('session/create', {
            user     => $self->user,
            password => $self->password,
            $self->api_key ? (api_key => $self->api_key) : (),
        }, sub {
            my ($res, $hdr) = @_;
            return unless $self;

            if ($res and $res->{status} eq 'ok') {
                debugf "session created: %s", $res->{session};
                $self->session( $res->{session} );
                $self->_get_channels;
            }
            else {
                debugf "session create failed: %s", ddf($res || $hdr);
                $self->_on_error($res, $hdr);
            }
        });
    }

    Scalar::Util::weaken($self);
}

sub update_room_info {
    my ($self) = @_;
    $self->_get_channels;
}

sub _get_channels {
    my ($self) = @_;

    debugf "getting joined channels";

    $self->get('user/get_rooms', { session => $self->session }, sub {
        my ($res, $hdr) = @_;
        return unless $self;

        if ($res and $res->{status} eq 'ok') {
            debugf "got rooms: %s", ddf($res->{rooms});
            $self->_update_room_info( $res->{rooms} );
        }
        else {
            $self->_on_error($res, $hdr);
        }
    });
    Scalar::Util::weaken($self);
}

sub _update_room_info {
    my ($self, $rooms) = @_;

    $self->get('room/show', { session => $self->session, room => join ',', @{ $rooms } }, sub {
        my ($res, $hdr) = @_;
        return unless $self;

        if ($res and $res->{status} eq 'ok') {
            debugf "got room infos";
            if ($self->on_room_info) {
                $self->on_room_info->($res->{rooms});
            }
            else {
                debugf "no room info callback";
            }

            $self->_start_observe($rooms);
        }
        else {
            $self->_on_error($res, $hdr);
        }
    });
    Scalar::Util::weaken($self);
}

sub _start_observe {
    my ($self, $rooms) = @_;

    $self->post('room/subscribe', {
        session => $self->session,
        rooms   => join(',', @$rooms),
        reset   => 1,
    }, sub {
        my ($res, $hdr) = @_;
        return unless $self;

        if ($res and $res->{status} eq 'ok') {
            $self->counter( $res->{counter} );
            $self->_polling;
        }
        else {
            $self->_on_error($res, $hdr);
        }
    });
    Scalar::Util::weaken($self);
}

sub _polling {
    my ($self) = @_;

    if ($self->_polling_guard) {
        debugf 'polling session is still active, ignoring this request';
        return;
    }

    my $uri = URI->new( $self->endpoint . 'event/observe' );
    $uri->port(8080);
    $uri->query_form({ session => $self->session, counter => $self->counter });

    my $guard = http_get $uri, timeout => 60, sub {
        my ($body, $hdr) = @_;
        return unless $self;

        my $res = try { decode_json $body };

        if ($res and $res->{status} eq 'ok') {
            if ($res->{counter}) {
                $self->counter( $res->{counter} );
            }
            if ($res->{events}) {
                if (my $cb = $self->on_event) {
                    $cb->($_) for @{ $res->{events} };
                }
                else {
                    debugf "no on_event callback";
                }
            }

            $self->_clear_polling_guard;
            $self->_polling;
        }
        else {
            $self->_on_error($res, $hdr);
        }
    };
    Scalar::Util::weaken($self);

    $self->_polling_guard( $guard );
}

sub say {
    my ($self, $room, $msg, $cb) = @_;

    $self->post('room/say', { session => $self->session, room => $room, text => $msg }, sub {
        my ($res, $hdr) = @_;
        return unless $self;

        if ($res and $res->{status} eq 'ok') {
            $cb->($res) if $cb;
        }
        else {
            $self->_on_error($res, $hdr);
        }
    });

    Scalar::Util::weaken($self);
}

1;

__END__

=head1 NAME

AnyEvent::Lingr - Asynchronous Lingr client.

=head1 SYNOPSIS

    use AnyEvent;
    use AnyEvent::Lingr;
    
    my $lingr = AnyEvent::Lingr->new(
        user     => 'your lingr username',
        password => 'your lingr password',
        api_key  => 'your lingr api_key', # optional
    );
    
    # error handler
    $lingr->on_error(sub {
        my ($msg) = @_;
        warn 'Lingr error: ', $msg;
    
        # reconnect after 5 seconds,
        my $t; $t = AnyEvent->timer(
            after => 5,
            cb    => sub {
                $lingr->start_session;
                undef $t;
            },
        );
    });
    
    # room info handler
    $lingr->on_room_info(sub {
        my ($rooms) = @_;
    
        print "Joined rooms:\n";
        for my $room (@$rooms) {
            print "  $room->{id}\n";
        }
    });
    
    # event handler
    $lingr->on_event(sub {
        my ($event) = @_;
    
        # print message
        if (my $msg = $event->{message}) {
            print sprintf "[%s] %s: %s\n",
                $msg->{room}, $msg->{nickname}, $msg->{text};
        }
    });
    
    # start lingr session
    $lingr->start_session;