From dcdea4247b6457202ce746814ff44d249c32d8b5 Mon Sep 17 00:00:00 2001
From: Daniel Friesel <derf@finalrewind.org>
Date: Mon, 11 Jan 2021 22:09:00 +0100
Subject: train details: show cycle (if available)

---
 lib/DBInfoscreen/Controller/Stationboard.pm | 25 +++++++++++++++--
 lib/DBInfoscreen/Helper/Wagonorder.pm       | 42 +++++++++++++++++++++++++++++
 templates/_train_details.html.ep            |  3 +++
 3 files changed, 68 insertions(+), 2 deletions(-)

diff --git a/lib/DBInfoscreen/Controller/Stationboard.pm b/lib/DBInfoscreen/Controller/Stationboard.pm
index 9bb09b1..2eb7b12 100644
--- a/lib/DBInfoscreen/Controller/Stationboard.pm
+++ b/lib/DBInfoscreen/Controller/Stationboard.pm
@@ -560,6 +560,9 @@ sub render_train {
 	my $stationinfo_req = Mojo::Promise->new;
 	my $route_req       = Mojo::Promise->new;
 
+	my @requests
+	  = ( $wagonorder_req, $utilization_req, $stationinfo_req, $route_req );
+
 	if ( $departure->{wr_link} ) {
 		$self->wagonorder->is_available_p( $result, $departure->{wr_link} )
 		  ->then(
@@ -769,9 +772,27 @@ sub render_train {
 		}
 	)->wait;
 
+	if ( $self->param('detailed') ) {
+		my $cycle_req = Mojo::Promise->new;
+		push( @requests, $cycle_req );
+		$self->wagonorder->has_umlauf_p( $result->train_no )->then(
+			sub {
+				$departure->{has_cycle} = 1;
+			}
+		)->catch(
+			sub {
+				# nop
+			}
+		)->finally(
+			sub {
+				$cycle_req->resolve;
+				return;
+			}
+		)->wait;
+	}
+
 	# Defer rendering until all requests have completed
-	Mojo::Promise->all( $wagonorder_req, $utilization_req, $stationinfo_req,
-		$route_req )->then(
+	Mojo::Promise->all(@requests)->then(
 		sub {
 			$self->render(
 				$template // '_train_details',
diff --git a/lib/DBInfoscreen/Helper/Wagonorder.pm b/lib/DBInfoscreen/Helper/Wagonorder.pm
index e843b54..5904d86 100644
--- a/lib/DBInfoscreen/Helper/Wagonorder.pm
+++ b/lib/DBInfoscreen/Helper/Wagonorder.pm
@@ -1,4 +1,5 @@
 package DBInfoscreen::Helper::Wagonorder;
+
 # Copyright (C) 2011-2020 Daniel Friesel
 #
 # SPDX-License-Identifier: BSD-2-Clause
@@ -56,6 +57,47 @@ sub is_available_p {
 	return $promise;
 }
 
+sub has_umlauf_p {
+	my ( $self, $train_no ) = @_;
+
+	my $promise = Mojo::Promise->new;
+
+	my $url   = "https://lib.finalrewind.org/dbdb/db_umlauf/${train_no}.png";
+	my $cache = $self->{main_cache};
+
+	if ( my $content = $cache->get($url) ) {
+		if ( $content eq 'y' ) {
+			return $promise->resolve;
+		}
+		else {
+			return $promise->reject;
+		}
+	}
+
+	$self->{user_agent}->request_timeout(5)->head_p( $url => $self->{header} )
+	  ->then(
+		sub {
+			my ($tx) = @_;
+			if ( $tx->result->is_success ) {
+				$cache->set( $url, 'y' );
+				$promise->resolve;
+			}
+			else {
+				$cache->set( $url, 'n' );
+				$promise->reject;
+			}
+			return;
+		}
+	)->catch(
+		sub {
+			$cache->set( $url, 'n' );
+			$promise->reject;
+			return;
+		}
+	)->wait;
+	return $promise;
+}
+
 sub check_wagonorder_p {
 	my ( $self, $train_no, $wr_link ) = @_;
 
diff --git a/templates/_train_details.html.ep b/templates/_train_details.html.ep
index 77a61ba..3a68c80 100644
--- a/templates/_train_details.html.ep
+++ b/templates/_train_details.html.ep
@@ -228,6 +228,9 @@
 %       }
       </ul> <!-- mroute -->
 %   }
+%   if (param('detailed') and $departure->{has_cycle}) {
+      <div><a href="https://lib.finalrewind.org/dbdb/db_umlauf/<%= $departure->{train_no} %>.png">Umlaufplan</a></div>
+%   }
 %   if (param('detailed') and $details->{commonAttr}) {
 %     if ($details->{attrVariants} and (not $details->{commonAttr}{vmax} or not $details->{commonAttr}{brakingPercentage})) {
         <div class="db-attr">
-- 
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