From 520e6456001cf858d7e59606a77b1cf0ab115aa9 Mon Sep 17 00:00:00 2001
From: Birte Kristina Friesel <derf@finalrewind.org>
Date: Fri, 23 Aug 2024 22:44:02 +0200
Subject: Suggest backends based on coverage and latest checkout coordinates

References #156
---
 cpanfile                            |  1 +
 lib/Travelynx/Controller/Account.pm | 34 ++++++++++++++++++++++++++++++++
 lib/Travelynx/Model/Journeys.pm     | 26 +++++++++++++++++++++++++
 templates/select_backend.html.ep    | 39 +++++++++++++++++++++++++++++++++++++
 4 files changed, 100 insertions(+)

diff --git a/cpanfile b/cpanfile
index f398415..673b738 100644
--- a/cpanfile
+++ b/cpanfile
@@ -7,6 +7,7 @@ requires 'Email::Sender::Simple';
 requires 'GIS::Distance';
 requires 'GIS::Distance::Fast';
 requires 'List::UtilsBy';
+requires 'Math::Polygon';
 requires 'MIME::Entity';
 requires 'Mojolicious';
 requires 'Mojolicious::Plugin::Authentication';
diff --git a/lib/Travelynx/Controller/Account.pm b/lib/Travelynx/Controller/Account.pm
index 1847cda..aa3fa3a 100644
--- a/lib/Travelynx/Controller/Account.pm
+++ b/lib/Travelynx/Controller/Account.pm
@@ -6,6 +6,7 @@ package Travelynx::Controller::Account;
 use Mojo::Base 'Mojolicious::Controller';
 
 use JSON;
+use Math::Polygon;
 use Mojo::Util qw(xml_escape);
 use Text::Markdown;
 use UUID::Tiny qw(:std);
@@ -1004,6 +1005,7 @@ sub backend_form {
 	my $user = $self->current_user;
 
 	my @backends = $self->stations->get_backends;
+	my @suggested_backends;
 
 	my %place_map = (
 		AT       => 'Österreich',
@@ -1035,6 +1037,10 @@ sub backend_form {
 		'US-TX'  => 'Texas',
 	);
 
+	my ( $user_lat, $user_lon )
+	  = $self->journeys->get_latest_checkout_latlon( uid => $user->{id} );
+	say $user_lat . ' ' . $user_lon;
+
 	for my $backend (@backends) {
 		my $type = 'UNKNOWN';
 		if ( $backend->{iris} ) {
@@ -1051,6 +1057,33 @@ sub backend_form {
 				$backend->{regions}  = [ map { $place_map{$_} // $_ }
 					  @{ $s->{coverage}{regions} // [] } ];
 				$backend->{has_area} = $s->{coverage}{area} ? 1 : 0;
+
+				if (    $s->{coverage}{area}
+					and $s->{coverage}{area}{type} eq 'Polygon' )
+				{
+					# [0] == outer polygon, [1:] == holes within polygon
+					my $poly = Math::Polygon->new(
+						@{ $s->{coverage}{area}{coordinates}[0] } );
+					say $backend->{name} . ' ' . $poly->area;
+					if ( $poly->contains( [ $user_lon, $user_lat ] ) ) {
+						push( @suggested_backends, $backend );
+					}
+				}
+				elsif ( $s->{coverage}{area}
+					and $s->{coverage}{area}{type} eq 'MultiPolygon' )
+				{
+					for my $s_poly (
+						@{ $s->{coverage}{area}{coordinates} // [] } )
+					{
+						my $poly
+						  = Math::Polygon->new( @{ $s_poly->[0] // [] } );
+						say $backend->{name} . ' ' . $poly->area;
+						if ( $poly->contains( [ $user_lon, $user_lat ] ) ) {
+							push( @suggested_backends, $backend );
+							last;
+						}
+					}
+				}
 			}
 			else {
 				$type = undef;
@@ -1072,6 +1105,7 @@ sub backend_form {
 
 	$self->render(
 		'select_backend',
+		suggestions => \@suggested_backends,
 		backends    => \@backends,
 		user        => $user,
 		redirect_to => $self->req->param('redirect_to') // '/',
diff --git a/lib/Travelynx/Model/Journeys.pm b/lib/Travelynx/Model/Journeys.pm
index 6d59d44..8a97aef 100755
--- a/lib/Travelynx/Model/Journeys.pm
+++ b/lib/Travelynx/Model/Journeys.pm
@@ -807,6 +807,32 @@ sub get_oldest_ts {
 	return undef;
 }
 
+sub get_latest_checkout_latlon {
+	my ( $self, %opt ) = @_;
+	my $uid = $opt{uid};
+	my $db  = $opt{db} // $self->{pg}->db;
+
+	my $res_h = $db->select(
+		'journeys_str',
+		[ 'arr_lat', 'arr_lon', ],
+		{
+			user_id   => $uid,
+			cancelled => 0
+		},
+		{
+			limit    => 1,
+			order_by => { -desc => 'journey_id' }
+		}
+	)->hash;
+
+	if ( not $res_h ) {
+		return;
+	}
+
+	return $res_h->{arr_lat}, $res_h->{arr_lon};
+
+}
+
 sub get_latest_checkout_ids {
 	my ( $self, %opt ) = @_;
 	my $uid = $opt{uid};
diff --git a/templates/select_backend.html.ep b/templates/select_backend.html.ep
index d5bc9d5..55182f9 100644
--- a/templates/select_backend.html.ep
+++ b/templates/select_backend.html.ep
@@ -14,6 +14,45 @@
 	% if (stash('redirect_to')) {
 		%= hidden_field 'redirect_to' => stash('redirect_to')
 	% }
+	% if (@{stash('suggestions') // []}) {
+		<div class="row">
+			<div class="col s12">
+				<h3>Vorschläge</h3>
+			</div>
+		</div>
+		% for my $backend (@{ stash('suggestions') // [] }) {
+			<div class="row">
+				<div class="col s8 m6 l6 right-align">
+					%= $backend->{longname}
+					% if ($backend->{id} == $user->{backend_id}) {
+						(aktuell ausgewählt)
+					% }
+					% if ($backend->{has_area}) {
+						<br/>
+						<a href="https://dbf.finalrewind.org/coverage/HAFAS/<%= $backend->{name} %>"><%= join(q{, }, @{$backend->{regions} // []}) || '[Karte]' %></a>
+					% }
+					% elsif ($backend->{regions}) {
+						<br/>
+						%= join(q{, }, @{$backend->{regions} // []})
+					% }
+					% if ($backend->{homepage}) {
+						<br/>
+						<a href="<%= $backend->{homepage} %>"><%= $backend->{homepage} =~ s{ ^ http s? :// (?: www[.] )? (.*?) (?: / )? $ }{$1}xr %></a>
+					% }
+				</div>
+				<div class="col s4 m6 l6 left-align">
+					<button class="btn waves-effect waves-light <%= $backend->{id} == $user->{backend_id} ? 'disabled' : q{} %>" style="min-width: 6em;" type="submit" name="backend" value="<%= $backend->{id} %>">
+						<%= $backend->{name} %>
+					</button>
+				</div>
+			</div>
+		% }
+	% }
+	<div class="row">
+		<div class="col s12">
+			<h3>Alle Backends</h3>
+		</div>
+	</div>
 	% for my $backend (@{ stash('backends') // [] }) {
 		<div class="row">
 			<div class="col s8 m6 l6 right-align">
-- 
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