package PoorBooru;
use v5.32;
use Dancer2;
use HTTP::Tiny;


our $VERSION = v0.0.1;

my $POORBOORU_API = setting("poorbooru_api");


sub validate_page_number ($) { $_[0] =~ /^[1-9][0-9]*$/ }

sub api_request ($$;%)
{
	my ($method, $path, $params_hashref) = @_;

	my $http = HTTP::Tiny->new(
		timeout    => 15,
		verify_SSL => true,
		agent      => setting("appname") . " backend " .
		    version::->parse($VERSION)->normal,

		default_headers => {
			"Accept"       => "application/json",
			"Content-Type" => "application/json",
		},
	);
	my $params = $http->www_form_urlencode($params_hashref // {});

	return $http->request($method, "$POORBOORU_API$path" .
	    ($params ne "" ? "?$params" : ""));
}

sub api_get ($;%) { api_request("GET", shift, @_) }

sub nav_pager ($$)
{
	my ($p, $uri) = @_;

	my (%pager, %res);
	%pager = %$p;
	$res{first} = $pager{first} != $pager{cur} ?
	    uri_for($uri, { page => $pager{first} }) : undef;
	$res{prev} = defined($pager{prev}) && $pager{prev} != $pager{first} ?
	    uri_for($uri, { page => $pager{prev} }) : undef;
	$res{cur} = $pager{cur};
	$res{next} = defined($pager{next}) && $pager{next} != $pager{last} ?
	    uri_for($uri, { page => $pager{next} }) : undef;
	$res{last} = $pager{last} != $pager{cur} ?
	    uri_for($uri, { page => $pager{last} }) : undef;

	return \%res;
}


hook before_template_render => sub {
	my $tokens = shift;

	$tokens->{uris}->{root} = uri_for("/");
	$tokens->{uris}->{login} = uri_for("/login");
	$tokens->{uris}->{logout} = uri_for("/logout");
	$tokens->{uris}->{random} = uri_for("/random/media");
	$tokens->{uris}->{tags} = uri_for("/tags");
};

get "/" => sub {
	my $page = query_parameters->get("page") // 1;
	send_error("Invalid page number", 400) if !validate_page_number($page);

	my $res = api_get("/media", { page => $page });
	send_error("API error", 500) if !$res->{success};

	my $data = decode_json($res->{content});
	my @media = map +{
		# XXX point to a cache
		image_src => "$POORBOORU_API/download/$_",
		media_uri => uri_for("/media/$_"),
	}, @{$data->{media}};

	template "gallery" => {
		title => "PoorBooru",
		media => \@media,
		pager => nav_pager($data->{pager}, "/"),
	};
};

get "/tags" => sub {
	my $page = query_parameters->get("page") // 1;
	send_error("Invalid page number", 400) if !validate_page_number($page);

	my $res = api_get("/tags", { page => $page });
	send_error("API error", 500) if !$res->{success};

	my $data = decode_json($res->{content});
	my @tags = map +{
		name  => $_->{name},
		count => $_->{count},
		uri   => uri_for("/tag/$_->{name}"),
	}, @{$data->{tags}};

	template "tags" => {
		title => "Tags",
		tags  => \@tags,
		pager => nav_pager($data->{pager}, "/tags"),
	};
};

get "/tag/:tag_id_or_name" => sub {
	my $page = query_parameters->get("page") // 1;
	send_error("Invalid page number", 400) if !validate_page_number($page);

	my $tag_id_or_name = route_parameters->get("tag_id_or_name");

	my $res = api_get("/tag/$tag_id_or_name", { page => $page });
	send_error("API error", 500) if !$res->{success};

	my $data = decode_json($res->{content});
	my @media = map +{
		# XXX point to a cache
		image_src => "$POORBOORU_API/download/$_",
		media_uri => uri_for("/media/$_"),
	}, @{$data->{media}};

	template "gallery" => {
		title => $data->{name},
		media => \@media,
		pager => nav_pager($data->{pager}, "/tag/$tag_id_or_name"),
	};
};

get "/media/:media_id" => sub {
	my $media_id = route_parameters->get("media_id");

	my $res = api_get("/media/$media_id");
	send_error("API error", 500) if !$res->{success};

	my $data = decode_json($res->{content});

	template "media" => {
		no_title       => 1,
		title          => $data->{id},
		image_src      => "$POORBOORU_API/download/$data->{id}",
		media_id       => $data->{id},
		media_filename => $data->{filename},
		media_size     => $data->{size},
		media_tags     => [],
	};
};

get "/random/media" => sub {
	my $res = api_get("/random/media");
	send_error("API error", 500) if !$res->{success};

	my $data = decode_json($res->{content});
	# XXX body content.
	redirect "/media/$data->{id}";
};

get "/random/tag" => sub {
	my $res = api_get("/random/tag");
	send_error("API error", 500) if !$res->{success};

	my $data = decode_json($res->{content});
	# XXX body content.
	redirect "/tag/$data->{name}";
};

true;