From 346aa5f857d852591d5e2ef5c0ad4dba49fbae0f Mon Sep 17 00:00:00 2001
From: Daniel Friesel <derf@finalrewind.org>
Date: Thu, 2 Feb 2023 20:28:40 +0100
Subject: StopFinder: add new_p constructor

---
 lib/Travel/Status/DE/HAFAS/StopFinder.pm | 91 ++++++++++++++++++++++++++++++--
 1 file changed, 87 insertions(+), 4 deletions(-)

(limited to 'lib/Travel/Status/DE/HAFAS/StopFinder.pm')

diff --git a/lib/Travel/Status/DE/HAFAS/StopFinder.pm b/lib/Travel/Status/DE/HAFAS/StopFinder.pm
index 0ae3800..9b3d232 100644
--- a/lib/Travel/Status/DE/HAFAS/StopFinder.pm
+++ b/lib/Travel/Status/DE/HAFAS/StopFinder.pm
@@ -14,13 +14,15 @@ use LWP::UserAgent;
 
 our $VERSION = '4.04';
 
+# {{{ Constructors
+
 sub new {
 	my ( $obj, %conf ) = @_;
 
 	my $lang = $conf{language} // 'd';
 	my $ua   = $conf{ua};
 
-	if ( not $ua ) {
+	if ( not $ua and not $conf{async} ) {
 		my %lwp_options = %{ $conf{lwp_options} // { timeout => 10 } };
 		$ua = LWP::UserAgent->new(%lwp_options);
 		$ua->env_proxy;
@@ -46,6 +48,10 @@ sub new {
 
 	bless( $ref, $obj );
 
+	if ( $conf{async} ) {
+		return $ref;
+	}
+
 	my $url = $conf{url} . "/${lang}n";
 
 	$reply = $ua->post( $url, $ref->{post} );
@@ -69,6 +75,62 @@ sub new {
 	return $ref;
 }
 
+sub new_p {
+	my ( $obj, %conf ) = @_;
+	my $promise = $conf{promise}->new;
+
+	if ( not $conf{input} ) {
+		return $promise->reject('You need to specify an input value');
+	}
+	if ( not $conf{url} ) {
+		return $promise->reject('You need to specify a URL');
+	}
+
+	my $self = $obj->new( %conf, async => 1 );
+	$self->{promise} = $conf{promise};
+
+	my $lang = $conf{language} // 'd';
+	my $url  = $conf{url} . "/${lang}n";
+	$conf{user_agent}->post_p( $url, form => $self->{post} )->then(
+		sub {
+			say "then";
+			my ($tx) = @_;
+			if ( my $err = $tx->error ) {
+				$promise->reject(
+					"POST $url returned HTTP $err->{code} $err->{message}");
+				return;
+			}
+			my $content = $tx->res->body;
+
+			say $content;
+			$self->{raw_reply} = $content;
+
+			$self->{raw_reply} =~ s{ ^ SLs [.] sls = }{}x;
+			$self->{raw_reply} =~ s{ ; SLs [.] showSuggestion [(] [)] ; $ }{}x;
+
+			if ( $self->{developer_mode} ) {
+				say $self->{raw_reply};
+			}
+
+			$self->{json} = from_json( $self->{raw_reply} );
+
+			$promise->resolve($self);
+			return;
+		}
+	)->catch(
+		sub {
+			say "catch";
+			my ($err) = @_;
+			$promise->reject($err);
+			return;
+		}
+	)->wait;
+
+	return $promise;
+}
+
+# }}}
+
 sub errstr {
 	my ($self) = @_;
 
@@ -172,18 +234,39 @@ you can use an empty hashref to override it.
 
 =back
 
-=item $status->errstr
+=item my $stopfinder_p = Travel::Status::DE::HAFAS::StopFinder->new_p(I<%opt>)
+
+Return a promise that resolves into a Travel::Status::DE::HAFAS::StopFinder instance
+($stopfinder) on success and rejects with an error message ($stopfinder->errstr) on
+failure. In addition to the arguments of B<new>, the following mandatory
+arguments must be set.
+
+=over
+
+=item B<promise> => I<promises module>
+
+Promises implementation to use for internal promises as well as B<new_p> return
+value.  Recommended: Mojo::Promise(3pm).
+
+=item B<user_agent> => I<user agent>
+
+User agent instance to use for asynchronous requests. The object must implement
+a B<post_p> function. Recommended: Mojo::UserAgent(3pm).
+
+=back
+
+=item $stopfinder->errstr
 
 In case of an error in the HTTP request, returns a string describing it.  If
 no error occurred, returns undef.
 
-=item $status->results
+=item $stopfinder->results
 
 Returns a list of stop candidates. Each list element is a hash reference. The
 hash keys are B<id> (IBNR / UIC station code) and B<name> (stop name). Both can
 be used as input for the Travel::Status::DE::HAFAS(3pm) constructor.
 
-If no matching results were found or the parser / http request failed, returns
+If no matching results were found or the parser / HTTP request failed, returns
 the empty list.
 
 =back
-- 
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