From fa07cf564512fb7718f8d1f943f5a36e175a890a Mon Sep 17 00:00:00 2001
From: Lucas <lucas@domain.invalid>
Date: Fri, 10 Mar 2023 20:34:00 +0000
Subject: [PATCH] backend: implement paging

---
 lib/PoorBooru/Backend.pm                    | 21 +++++++++++++++++++++
 lib/PoorBooru/Backend/Controller/Gallery.pm |  9 ++++++---
 lib/PoorBooru/Backend/Controller/Tags.pm    | 18 ++++++++++++------
 templates/layouts/main.html.ep              | 12 ++++++++++++
 4 files changed, 51 insertions(+), 9 deletions(-)

diff --git a/lib/PoorBooru/Backend.pm b/lib/PoorBooru/Backend.pm
index 5719a27..41328f1 100644
--- a/lib/PoorBooru/Backend.pm
+++ b/lib/PoorBooru/Backend.pm
@@ -6,6 +6,26 @@ use warnings;
 use Mojo::Base "Mojolicious";
 use SeaweedFS::Client;
 
+sub _pager_links ($c, $dbp)
+{
+	my %pager;
+	my $page_url = sub ($p) { $c->url_with->query({page => $p}) };
+
+	$pager{first_page} = $page_url->($dbp->{first_page})
+	    if $dbp->{first_page} != $dbp->{current_page};
+	$pager{previous_page} = $page_url->($dbp->{previous_page})
+	    if defined($dbp->{previous_page}) &&
+	    $dbp->{previous_page} != $dbp->{first_page};
+	$pager{current_page} = $dbp->{current_page};
+	$pager{next_page} = $page_url->($dbp->{next_page})
+	    if defined($dbp->{next_page}) &&
+	    $dbp->{next_page} != $dbp->{last_page};
+	$pager{last_page} = $page_url->($dbp->{last_page})
+	    if $dbp->{last_page} != $dbp->{current_page};
+
+	return %pager;
+}
+
 sub startup ($self)
 {
 	$self->moniker("poorbooru-backend");
@@ -17,6 +37,7 @@ sub startup ($self)
 		state $client =
 		    SeaweedFS::Client->new($config->{seaweedfs_master})
 	});
+	$self->helper(pager_links => \&_pager_links);
 
 	my $r = $self->routes;
 
diff --git a/lib/PoorBooru/Backend/Controller/Gallery.pm b/lib/PoorBooru/Backend/Controller/Gallery.pm
index 3d20f44..ec2b4f6 100644
--- a/lib/PoorBooru/Backend/Controller/Gallery.pm
+++ b/lib/PoorBooru/Backend/Controller/Gallery.pm
@@ -19,8 +19,7 @@ sub index ($self)
 	) if $v->has_error;
 
 	my $poorbooru_api = $self->config("poorbooru_api");
-	my $ua = Mojo::UserAgent->new;
-	my $res = $ua->get("$poorbooru_api/media?page=$page")->result;
+	my $res = $self->ua->get("$poorbooru_api/media?page=$page")->result;
 
 	return $self->render(status => $res->code) if $res->is_error;
 
@@ -30,7 +29,11 @@ sub index ($self)
 		),
 	}, @{$res->json->{media}};
 
-	return $self->render(template => "gallery", media => \@media);
+	return $self->render(
+		template => "gallery",
+		media    => \@media,
+		pager    => { $self->pager_links($res->json->{pager}) },
+	);
 };
 
 1;
diff --git a/lib/PoorBooru/Backend/Controller/Tags.pm b/lib/PoorBooru/Backend/Controller/Tags.pm
index ef3da51..9750780 100644
--- a/lib/PoorBooru/Backend/Controller/Tags.pm
+++ b/lib/PoorBooru/Backend/Controller/Tags.pm
@@ -17,8 +17,7 @@ sub list ($self)
 	return $self->render(status => 404) if $v->has_error;
 
 	my $poorbooru_api = $self->config("poorbooru_api");
-	my $ua = Mojo::UserAgent->new;
-	my $res = $ua->get("$poorbooru_api/tags?page=$page")->result;
+	my $res = $self->ua->get("$poorbooru_api/tags?page=$page")->result;
 
 	return $self->render(status => $res->code) if $res->is_error;
 
@@ -28,7 +27,11 @@ sub list ($self)
 		uri   => $self->url_for("/tag/$_->{name}"),
 	}, @{$res->json->{tags}};
 
-	return $self->render(template => "tags", tags => \@tags);
+	return $self->render(
+		template => "tags",
+		tags     => \@tags,
+		pager    => { $self->pager_links($res->json->{pager}) },
+	);
 };
 
 sub show ($self)
@@ -42,8 +45,7 @@ sub show ($self)
 
 	my $tag_id_or_name = $self->stash("tag_id_or_name");
 	my $poorbooru_api = $self->config("poorbooru_api");
-	my $ua = Mojo::UserAgent->new;
-	my $res = $ua->get("$poorbooru_api/tag/$tag_id_or_name?page=$page")
+	my $res = $self->ua->get("$poorbooru_api/tag/$tag_id_or_name?page=$page")
 	    ->result;
 
 	return $self->render(status => $res->code) if $res->is_error;
@@ -54,7 +56,11 @@ sub show ($self)
 		),
 	}, @{$res->json->{media}};
 
-	return $self->render(template => "gallery", media => \@media);
+	return $self->render(
+		template => "gallery",
+		media    => \@media,
+		pager    => { $self->pager_links($res->json->{pager}) },
+	);
 };
 
 1;
diff --git a/templates/layouts/main.html.ep b/templates/layouts/main.html.ep
index 019cb60..b9d64d4 100644
--- a/templates/layouts/main.html.ep
+++ b/templates/layouts/main.html.ep
@@ -20,6 +20,18 @@
     <div class="viewport flex-i-fullsize flex-c-vertical">
       <h1><%= title %></h1>
       <div class="viewport flex-i-fullsize"><%= content %></div>
+      <% if (defined $pager) { %>
+      <footer>
+	<!--<pre><code><%= dumper $pager %></code></pre>-->
+	<nav class="text-center">
+	  <%= link_to "<<" => $pager->{first_page} if exists $pager->{first_page} %>
+	  <%= link_to "<" => $pager->{previous_page} if exists $pager->{previous_page} %>
+	  <span><%= $pager->{current_page} %></span>
+	  <%= link_to ">" => $pager->{next_page} if exists $pager->{next_page} %>
+	  <%= link_to ">>" => $pager->{last_page} if exists $pager->{last_page} %>
+	</nav>
+      </footer>
+      <% } %>
     </div>
   </main>
   <footer class="text-center">