Fetch map asynchronously

package DBInfoscreen::Controller::Map;

use Mojo::Base 'Mojolicious::Controller';

use Mojo::JSON qw(decode_json);

use Mojo::Promise;

use Encode qw(decode);

my $dbf_version = qx{git describe --dirty} || 'experimental';

chomp $dbf_version;

sub get_hafas_polyline {

	my ( $ua, $cache, $trip_id, $line ) = @_;

sub get_hafas_polyline_p {

	my ( $self, $trip_id, $line ) = @_;

	my $url

	  = "https://2.db.transport.rest/trips/${trip_id}?lineName=${line}&polyline=true";

	my $cache   = $self->app->cache_iris_main;

	my $promise = Mojo::Promise->new;

	say $url;

	if ( my $content = $cache->thaw($url) ) {

		return $content;

		$promise->resolve($content);

		return $promise;

	}

	$ua->request_timeout(2);

	#say $url;

	my $res

	  = $ua->get(

	$self->ua->request_timeout(5)

	  ->get_p(

		$url => { 'User-Agent' => "dbf.finalrewind.org/${dbf_version}" } )

	  ->result;

	if ( $res->is_error ) {

		return;

	}

	my $json = decode_json( $res->body );

	  ->then(

		sub {

			my ($tx) = @_;

			my $body = decode( 'utf-8', $tx->res->body );

			my $json = decode_json($body);

			my @coordinate_list;

			for my $feature ( @{ $json->{polyline}{features} } ) {

			};

			$cache->freeze( $url, $ret );

	return $ret;

			$promise->resolve($ret);

		}

	)->catch(

		sub {

			my ($err) = @_;

			$promise->reject($err);

		}

	)->wait;

	return $promise;

}

sub route {

	my $trip_id = $self->stash('tripid');

	my $line_no = $self->stash('lineno');

	my $pl = get_hafas_polyline( $self->ua, $self->app->cache_iris_main,

		$trip_id, $line_no );

	$self->render_later;

	$self->get_hafas_polyline_p( $trip_id, $line_no )->then(

		sub {

			my ($pl) = @_;

			my @polyline = @{ $pl->{polyline} };

			my @line_pairs;

			my @station_coordinates;

				station_coordinates => [@station_coordinates],

			);

		}

	)->catch(

		sub {

			my ($err) = @_;

			$self->render(

				'route_map',

				title     => "Fehler",

				hide_opts => 1,

			);

		}

	)->wait;

}

1;

% if (0) {

% if (my $err = stash('error')) {

  <div class="container">

    <div class="error">

      <strong>Fehler!</strong>

		Baz

      <strong>Fehler bei der Routenabfrage</strong>

%=    $err

    </div>

  </div>

% }