Allow linking a Träwelling account, auto-sync Träwelling→travelynx

travelynx→Träwelling is still work-in-progress

Squashed commit of the following:

commit 97faa6e2e6c8d20fba30f2d0f6e78187ceeb72e6
Author: Daniel Friesel <derf@finalrewind.org>
Date:   Wed Sep 30 18:50:05 2020 +0200

    improve traewelling log and tx handling

commit 487d7dd728b9d45b731bdc7098cf3358ea2e206e
Author: Daniel Friesel <derf@finalrewind.org>
Date:   Wed Sep 30 18:02:41 2020 +0200

    add missing traewelling template

commit 0148da2f48d9a52dcddc0ab81f83d8f8ac3062ab
Author: Daniel Friesel <derf@finalrewind.org>
Date:   Wed Sep 30 18:02:35 2020 +0200

    improve traewelling pull sync

commit 4861a9750f9f2d7621043361d0af6b0a8869a0df
Author: Daniel Friesel <derf@finalrewind.org>
Date:   Tue Sep 29 22:14:24 2020 +0200

    wip checkin from traewelling

commit f6aeb6f06998a2a7a80f63a7b1b688b1a26b66bd
Author: Daniel Friesel <derf@finalrewind.org>
Date:   Tue Sep 29 18:37:53 2020 +0200

    refactor traewelling integration. login and logout are less of a hack now.

    checkin and checkout are not supported at the moment.

8 files changed, 971 insertions, 41 deletions

diff --git a/lib/Travelynx.pm b/lib/Travelynx.pm
index 4f58f57..ab1f7ef 100755
--- a/lib/Travelynx.pm
+++ b/lib/Travelynx.pm
@@ -20,7 +20,9 @@ use Travelynx::Helper::DBDB;
 use Travelynx::Helper::HAFAS;
 use Travelynx::Helper::IRIS;
 use Travelynx::Helper::Sendmail;
+use Travelynx::Helper::Traewelling;
 use Travelynx::Model::Journeys;
+use Travelynx::Model::Traewelling;
 use Travelynx::Model::Users;
 use XML::LibXML;
 
@@ -293,6 +295,26 @@ sub startup {
 	);
 
 	$self->helper(
+		traewelling => sub {
+			my ($self) = @_;
+			state $trwl = Travelynx::Model::Traewelling->new( pg => $self->pg );
+		}
+	);
+
+	$self->helper(
+		traewelling_api => sub {
+			my ($self) = @_;
+			state $trwl_api = Travelynx::Helper::Traewelling->new(
+				log        => $self->app->log,
+				model      => $self->traewelling,
+				root_url   => $self->url_for('/')->to_abs,
+				user_agent => $self->ua,
+				version    => $self->app->config->{version},
+			);
+		}
+	);
+
+	$self->helper(
 		journeys => sub {
 			my ($self) = @_;
 			state $journeys = Travelynx::Model::Journeys->new(
@@ -389,9 +411,12 @@ sub startup {
 
 	$self->helper(
 		'checkin' => sub {
-			my ( $self, $station, $train_id, $uid ) = @_;
+			my ( $self, %opt ) = @_;
 
-			$uid //= $self->current_user->{id};
+			my $station  = $opt{station};
+			my $train_id = $opt{train_id};
+			my $uid      = $opt{uid} // $self->current_user->{id};
+			my $db       = $opt{db} // $self->pg->db;
 
 			my $status = $self->iris->get_departures(
 				station    => $station,
@@ -409,7 +434,7 @@ sub startup {
 				}
 				else {
 
-					my $user = $self->get_user_status($uid);
+					my $user = $self->get_user_status( $uid, $db );
 					if ( $user->{checked_in} or $user->{cancelled} ) {
 
 						if (    $user->{train_id} eq $train_id
@@ -420,12 +445,17 @@ sub startup {
 						}
 
 						# Otherwise, someone forgot to check out first
-						$self->checkout( $station, 1, $uid );
+						$self->checkout(
+							station => $station,
+							force   => 1,
+							uid     => $uid,
+							db      => $db
+						);
 					}
 
 					eval {
 						my $json = JSON->new;
-						$self->pg->db->insert(
+						$db->insert(
 							'in_transit',
 							{
 								user_id   => $uid,
@@ -459,8 +489,12 @@ sub startup {
 							"Checkin($uid): INSERT failed: $@");
 						return ( undef, 'INSERT failed: ' . $@ );
 					}
-					$self->add_route_timestamps( $uid, $train, 1 );
-					$self->run_hook( $uid, 'checkin' );
+					if ( not $opt{in_transaction} ) {
+
+						# mustn't be called during a transaction
+						$self->add_route_timestamps( $uid, $train, 1 );
+						$self->run_hook( $uid, 'checkin' );
+					}
 					return ( $train, undef );
 				}
 			}
@@ -547,16 +581,19 @@ sub startup {
 
 	$self->helper(
 		'checkout' => sub {
-			my ( $self, $station, $force, $uid ) = @_;
+			my ( $self, %opt ) = @_;
 
-			my $db     = $self->pg->db;
-			my $status = $self->iris->get_departures(
+			my $station = $opt{station};
+			my $force   = $opt{force};
+			my $uid     = $opt{uid};
+			my $db      = $opt{db} // $self->pg->db;
+			my $status  = $self->iris->get_departures(
 				station    => $station,
 				lookbehind => 120,
 				lookahead  => 120
 			);
 			$uid //= $self->current_user->{id};
-			my $user     = $self->get_user_status($uid);
+			my $user     = $self->get_user_status( $uid, $db );
 			my $train_id = $user->{train_id};
 
 			if ( not $user->{checked_in} and not $user->{cancelled} ) {
@@ -671,7 +708,11 @@ sub startup {
 					}
 				}
 				if ( not $force ) {
-					$self->run_hook( $uid, 'update' );
+
+					# mustn't be called during a transaction
+					if ( not $opt{in_transaction} ) {
+						$self->run_hook( $uid, 'update' );
+					}
 					return ( 1, undef );
 				}
 			}
@@ -680,7 +721,10 @@ sub startup {
 
 			eval {
 
-				my $tx = $db->begin;
+				my $tx;
+				if ( not $opt{in_transaction} ) {
+					$tx = $db->begin;
+				}
 
 				if ( defined $train and not $train->arrival and not $force ) {
 					my $train_no = $train->train_no;
@@ -778,7 +822,9 @@ sub startup {
 					);
 				}
 
-				$tx->commit;
+				if ( not $opt{in_transaction} ) {
+					$tx->commit;
+				}
 			};
 
 			if ($@) {
@@ -787,27 +833,33 @@ sub startup {
 			}
 
 			if ( $has_arrived or $force ) {
-				$self->run_hook( $uid, 'checkout' );
+				if ( not $opt{in_transaction} ) {
+					$self->run_hook( $uid, 'checkout' );
+				}
 				return ( 0, undef );
 			}
-			$self->run_hook( $uid, 'update' );
-			$self->add_route_timestamps( $uid, $train, 0 );
+			if ( not $opt{in_transaction} ) {
+				$self->run_hook( $uid, 'update' );
+				$self->add_route_timestamps( $uid, $train, 0 );
+			}
 			return ( 1, undef );
 		}
 	);
 
 	$self->helper(
 		'update_in_transit_comment' => sub {
-			my ( $self, $comment, $uid ) = @_;
+			my ( $self, $comment, $uid, $db ) = @_;
 			$uid //= $self->current_user->{id};
+			$db  //= $self->pg->db;
 
-			my $status = $self->pg->db->select( 'in_transit', ['user_data'],
-				{ user_id => $uid } )->expand->hash;
+			my $status
+			  = $db->select( 'in_transit', ['user_data'], { user_id => $uid } )
+			  ->expand->hash;
 			if ( not $status ) {
 				return;
 			}
 			$status->{user_data}{comment} = $comment;
-			$self->pg->db->update(
+			$db->update(
 				'in_transit',
 				{ user_data => JSON->new->encode( $status->{user_data} ) },
 				{ user_id   => $uid }
@@ -1872,11 +1924,11 @@ sub startup {
 
 	$self->helper(
 		'get_user_status' => sub {
-			my ( $self, $uid ) = @_;
+			my ( $self, $uid, $db ) = @_;
 
 			$uid //= $self->current_user->{id};
+			$db  //= $self->pg->db;
 
-			my $db    = $self->pg->db;
 			my $now   = DateTime->now( time_zone => 'Europe/Berlin' );
 			my $epoch = $now->epoch;
 
@@ -2316,6 +2368,157 @@ sub startup {
 	);
 
 	$self->helper(
+		'traewelling_to_travelynx' => sub {
+			my ( $self, %opt ) = @_;
+			my $traewelling = $opt{traewelling};
+			my $user_data   = $opt{user_data};
+			my $uid         = $user_data->{user_id};
+
+			if ( not $traewelling->{checkin}
+				or $self->now->epoch - $traewelling->{checkin}->epoch > 900 )
+			{
+				$self->log->debug("... not checked in");
+				return;
+			}
+			if (    $traewelling->{status_id}
+				and $user_data->{data}{latest_pull_status_id}
+				and $traewelling->{status_id}
+				== $user_data->{data}{latest_pull_status_id} )
+			{
+				$self->log->debug("... already handled");
+				return;
+			}
+			$self->log->debug("... checked in");
+			my $user_status = $self->get_user_status($uid);
+			if ( $user_status->{checked_in} ) {
+				$self->log->debug(
+					"... also checked in via travelynx. aborting.");
+				return;
+			}
+
+			if ( $traewelling->{category}
+				!~ m{^ (?: nationalExpress | regional | suburban ) $ }x )
+			{
+				$self->log->debug("... status is not a train");
+				$self->traewelling->log(
+					uid => $uid,
+					message =>
+"$traewelling->{line} nach $traewelling->{arr_name} ist keine Zugfahrt",
+					status_id => $traewelling->{status_id},
+				);
+				$self->traewelling->set_latest_pull_status_id(
+					uid       => $uid,
+					status_id => $traewelling->{status_id}
+				);
+				return;
+			}
+
+			my $dep = $self->iris->get_departures(
+				station    => $traewelling->{dep_eva},
+				lookbehind => 60,
+				lookahead  => 40
+			);
+			if ( $dep->{errstr} ) {
+				$self->traewelling->log(
+					uid => $uid,
+					message =>
+"Fehler bei $traewelling->{line} nach $traewelling->{arr_name}: $dep->{errstr}",
+					status_id => $traewelling->{status_id},
+					is_error  => 1,
+				);
+				return;
+			}
+			my ( $train_ref, $train_id );
+			for my $train ( @{ $dep->{results} } ) {
+				if ( $train->line ne $traewelling->{line} ) {
+					next;
+				}
+				if ( not $train->sched_departure
+					or $train->sched_departure->epoch
+					!= $traewelling->{dep_dt}->epoch )
+				{
+					next;
+				}
+				if (
+					not List::Util::first { $_ eq $traewelling->{arr_name} }
+					$train->route_post
+				  )
+				{
+					next;
+				}
+				$train_id  = $train->train_id;
+				$train_ref = $train;
+				last;
+			}
+			if ($train_id) {
+				$self->log->debug("... found train: $train_id");
+
+				my $db = $self->pg->db;
+				my $tx = $db->begin;
+
+				my ( undef, $err ) = $self->checkin(
+					station        => $traewelling->{dep_eva},
+					train_id       => $train_id,
+					uid            => $uid,
+					in_transaction => 1,
+					db             => $db
+				);
+
+				if ( not $err ) {
+					( undef, $err ) = $self->checkout(
+						station        => $traewelling->{arr_eva},
+						train_id       => 0,
+						uid            => $uid,
+						in_transaction => 1,
+						db             => $db
+					);
+					if ( not $err ) {
+						$self->log->debug("... success!");
+						if ( $traewelling->{message} ) {
+							$self->update_in_transit_comment(
+								$traewelling->{message},
+								$uid, $db );
+						}
+						$self->traewelling->log(
+							uid => $uid,
+							db  => $db,
+							message =>
+"Eingecheckt in $traewelling->{line} nach $traewelling->{arr_name}",
+							status_id => $traewelling->{status_id},
+						);
+						$self->traewelling->set_latest_pull_status_id(
+							uid       => $uid,
+							status_id => $traewelling->{status_id},
+							db        => $db
+						);
+
+						$tx->commit;
+					}
+				}
+				if ($err) {
+					$self->log->debug("... error: $err");
+					$self->traewelling->log(
+						uid => $uid,
+						message =>
+"Fehler bei $traewelling->{line} nach $traewelling->{arr_name}: $err",
+						status_id => $traewelling->{status_id},
+						is_error  => 1
+					);
+				}
+			}
+			else {
+				$self->traewelling->log(
+					uid => $uid,
+					message =>
+"$traewelling->{line} nach $traewelling->{arr_name} nicht gefunden",
+					status_id => $traewelling->{status_id},
+					is_error  => 1
+				);
+			}
+		}
+	);
+
+	$self->helper(
 		'journeys_to_map_data' => sub {
 			my ( $self, %opt ) = @_;
 
@@ -2647,6 +2850,7 @@ sub startup {
 	$authed_r->get('/account')->to('account#account');
 	$authed_r->get('/account/privacy')->to('account#privacy');
 	$authed_r->get('/account/hooks')->to('account#webhook');
+	$authed_r->get('/account/traewelling')->to('traewelling#settings');
 	$authed_r->get('/account/insight')->to('account#insight');
 	$authed_r->get('/ajax/status_card.html')->to('traveling#status_card');
 	$authed_r->get('/cancelled')->to('traveling#cancelled');
@@ -2668,6 +2872,7 @@ sub startup {
 	$authed_r->get('/confirm_mail/:token')->to('account#confirm_mail');
 	$authed_r->post('/account/privacy')->to('account#privacy');
 	$authed_r->post('/account/hooks')->to('account#webhook');
+	$authed_r->post('/account/traewelling')->to('traewelling#settings');
 	$authed_r->post('/account/insight')->to('account#insight');
 	$authed_r->post('/journey/add')->to('traveling#add_journey_form');
 	$authed_r->post('/journey/comment')->to('traveling#comment_form');
diff --git a/lib/Travelynx/Command/database.pm b/lib/Travelynx/Command/database.pm
index 59e41d9..e92dd4b 100644
--- a/lib/Travelynx/Command/database.pm
+++ b/lib/Travelynx/Command/database.pm
@@ -1012,6 +1012,32 @@ my @migrations = (
 			}
 		);
 	},
+
+	# v21 -> v22
+	sub {
+		my ($db) = @_;
+		$db->query(
+			qq{
+				create table traewelling (
+					user_id integer not null references users (id) primary key,
+					email varchar(256) not null,
+					push_sync boolean not null,
+					pull_sync boolean not null,
+					errored boolean,
+					token text,
+					data jsonb,
+					latest_run timestamptz
+				);
+				comment on table traewelling is 'Token and Status for Traewelling';
+				create view traewelling_str as select
+					user_id, email, push_sync, pull_sync, errored, token, data,
+					extract(epoch from latest_run) as latest_run_ts
+					from traewelling
+				;
+				update schema_version set version = 22;
+			}
+		);
+	},
 );
 
 sub setup_db {
diff --git a/lib/Travelynx/Command/work.pm b/lib/Travelynx/Command/work.pm
index 9c870d8..593735f 100644
--- a/lib/Travelynx/Command/work.pm
+++ b/lib/Travelynx/Command/work.pm
@@ -108,7 +108,11 @@ sub run {
 
                   # check out (adds a cancelled journey and resets journey state
                   # to checkin
-						$self->app->checkout( $arr, 1, $uid );
+						$self->app->checkout(
+							station => $arr,
+							force   => 1,
+							uid     => $uid
+						);
 					}
 				}
 				else {
@@ -201,7 +205,11 @@ sub run {
 					{
                   # check out (adds a cancelled journey and resets journey state
                   # to destination selection)
-						$self->app->checkout( $arr, 0, $uid );
+						$self->app->checkout(
+							station => $arr,
+							force   => 0,
+							uid     => $uid
+						);
 					}
 				}
 				else {
@@ -209,7 +217,11 @@ sub run {
 				}
 			}
 			elsif ( $entry->{real_arr_ts} ) {
-				my ( undef, $error ) = $self->app->checkout( $arr, 1, $uid );
+				my ( undef, $error ) = $self->app->checkout(
+					station => $arr,
+					force   => 1,
+					uid     => $uid
+				);
 				if ($error) {
 					die("${error}\n");
 				}
@@ -222,6 +234,31 @@ sub run {
 		eval { }
 	}
 
+	for my $account_data ( $self->app->traewelling->get_pull_accounts ) {
+
+		# $account_data->{user_id} is the travelynx uid
+		# $account_data->{user_name} is the Träwelling username
+		$self->app->log->debug(
+			"Pulling Traewelling status for UID $account_data->{user_id}");
+		$self->app->traewelling_api->get_status_p(
+			username => $account_data->{data}{user_name},
+			token    => $account_data->{token}
+		)->then(
+			sub {
+				my ($traewelling) = @_;
+				$self->app->traewelling_to_travelynx(
+					traewelling => $traewelling,
+					user_data   => $account_data
+				);
+			}
+		)->catch(
+			sub {
+				my ($err) = @_;
+				$self->app->log->debug("Error $err");
+			}
+		)->wait;
+	}
+
 	# Computing yearly stats may take a while, but we've got all time in the
 	# world here. This means users won't have to wait when loading their
 	# own by-year journey log.
@@ -232,6 +269,8 @@ sub run {
 			year => $now->year
 		);
 	}
+
+	# TODO wait until all background jobs have terminated
 }
 
 1;
diff --git a/lib/Travelynx/Controller/Api.pm b/lib/Travelynx/Controller/Api.pm
index c7e58a9..8d2d2a7 100755
--- a/lib/Travelynx/Controller/Api.pm
+++ b/lib/Travelynx/Controller/Api.pm
@@ -258,14 +258,21 @@ sub travel_v1 {
 			$train_id = $train->train_id;
 		}
 
-		my ( $train, $error )
-		  = $self->checkin( $from_station, $train_id, $uid );
+		my ( $train, $error ) = $self->checkin(
+			station  => $from_station,
+			train_id => $train_id,
+			uid      => $uid
+		);
 		if ( $payload->{comment} and not $error ) {
 			$self->update_in_transit_comment(
 				sanitize( q{}, $payload->{comment} ), $uid );
 		}
 		if ( $to_station and not $error ) {
-			( $train, $error ) = $self->checkout( $to_station, 0, $uid );
+			( $train, $error ) = $self->checkout(
+				station => $to_station,
+				force   => 0,
+				uid     => $uid
+			);
 		}
 		if ($error) {
 			$self->render(
@@ -307,8 +314,11 @@ sub travel_v1 {
 				sanitize( q{}, $payload->{comment} ), $uid );
 		}
 
-		my ( $train, $error )
-		  = $self->checkout( $to_station, $payload->{force} ? 1 : 0, $uid );
+		my ( $train, $error ) = $self->checkout(
+			station => $to_station,
+			force   => $payload->{force} ? 1 : 0,
+			uid     => $uid
+		);
 		if ($error) {
 			$self->render(
 				json => {
diff --git a/lib/Travelynx/Controller/Traewelling.pm b/lib/Travelynx/Controller/Traewelling.pm
new file mode 100644
index 0000000..78c501f
--- /dev/null
+++ b/lib/Travelynx/Controller/Traewelling.pm
@@ -0,0 +1,104 @@
+package Travelynx::Controller::Traewelling;
+use Mojo::Base 'Mojolicious::Controller';
+use Mojo::Promise;
+
+sub settings {
+	my ($self) = @_;
+
+	my $uid = $self->current_user->{id};
+
+	if (    $self->param('action')
+		and $self->validation->csrf_protect->has_error('csrf_token') )
+	{
+		$self->render(
+			'traewelling',
+			invalid => 'csrf',
+		);
+		return;
+	}
+
+	if ( $self->param('action') and $self->param('action') eq 'login' ) {
+		my $email    = $self->param('email');
+		my $password = $self->param('password');
+		$self->render_later;
+		$self->traewelling_api->login_p(
+			uid      => $uid,
+			email    => $email,
+			password => $password
+		)->then(
+			sub {
+				my $traewelling = $self->traewelling->get($uid);
+				$self->param( sync_source => 'none' );
+				$self->render(
+					'traewelling',
+					traewelling     => $traewelling,
+					new_traewelling => 1,
+				);
+			}
+		)->catch(
+			sub {
+				my ($err) = @_;
+				$self->render(
+					'traewelling',
+					traewelling     => {},
+					new_traewelling => 1,
+					login_error     => $err,
+				);
+			}
+		)->wait;
+		return;
+	}
+	elsif ( $self->param('action') and $self->param('action') eq 'logout' ) {
+		$self->render_later;
+		my $traewelling = $self->traewelling->get($uid);
+		$self->traewelling_api->logout_p(
+			uid   => $uid,
+			token => $traewelling->{token}
+		)->then(
+			sub {
+				$self->flash( success => 'traewelling' );
+				$self->redirect_to('account');
+			}
+		)->catch(
+			sub {
+				my ($err) = @_;
+				$self->render(
+					'traewelling',
+					traewelling     => {},
+					new_traewelling => 1,
+					logout_error    => $err,
+				);
+			}
+		)->wait;
+		return;
+	}
+	elsif ( $self->param('action') and $self->param('action') eq 'config' ) {
+		$self->traewelling->set_sync(
+			uid       => $uid,
+			push_sync => $self->param('sync_source') eq 'travelynx' ? 1 : 0,
+			pull_sync => $self->param('sync_source') eq 'traewelling' ? 1 : 0
+		);
+		$self->flash( success => 'traewelling' );
+		$self->redirect_to('account');
+		return;
+	}
+
+	my $traewelling = $self->traewelling->get($uid);
+
+	if ( $traewelling->{push_sync} ) {
+		$self->param( sync_source => 'travelynx' );
+	}
+	elsif ( $traewelling->{pull_sync} ) {
+		$self->param( sync_source => 'traewelling' );
+	}
+	else {
+		$self->param( sync_source => 'none' );
+	}
+
+	$self->render(
+		'traewelling',
+		traewelling => $traewelling,
+	);
+}
+
+1;
diff --git a/lib/Travelynx/Controller/Traveling.pm b/lib/Travelynx/Controller/Traveling.pm
index f5e3255..4df1558 100755
--- a/lib/Travelynx/Controller/Traveling.pm
+++ b/lib/Travelynx/Controller/Traveling.pm
@@ -424,8 +424,10 @@ sub log_action {
 
 	if ( $params->{action} eq 'checkin' ) {
 
-		my ( $train, $error )
-		  = $self->checkin( $params->{station}, $params->{train} );
+		my ( $train, $error ) = $self->checkin(
+			station  => $params->{station},
+			train_id => $params->{train}
+		);
 		my $destination = $params->{dest};
 
 		if ($error) {
@@ -447,8 +449,10 @@ sub log_action {
 		else {
 			# Silently ignore errors -- if they are permanent, the user will see
 			# them when selecting the destination manually.
-			my ( $still_checked_in, undef )
-			  = $self->checkout( $destination, 0 );
+			my ( $still_checked_in, undef ) = $self->checkout(
+				station => $destination,
+				force   => 0
+			);
 			my $station_link = '/s/' . $destination;
 			$self->render(
 				json => {
@@ -459,8 +463,10 @@ sub log_action {
 		}
 	}
 	elsif ( $params->{action} eq 'checkout' ) {
-		my ( $still_checked_in, $error )
-		  = $self->checkout( $params->{station}, $params->{force} );
+		my ( $still_checked_in, $error ) = $self->checkout(
+			station => $params->{station},
+			force   => $params->{force}
+		);
 		my $station_link = '/s/' . $params->{station};
 
 		if ($error) {
@@ -505,8 +511,10 @@ sub log_action {
 		}
 	}
 	elsif ( $params->{action} eq 'cancelled_from' ) {
-		my ( undef, $error )
-		  = $self->checkin( $params->{station}, $params->{train} );
+		my ( undef, $error ) = $self->checkin(
+			station  => $params->{station},
+			train_id => $params->{train}
+		);
 
 		if ($error) {
 			$self->render(
@@ -526,8 +534,10 @@ sub log_action {
 		}
 	}
 	elsif ( $params->{action} eq 'cancelled_to' ) {
-		my ( undef, $error )
-		  = $self->checkout( $params->{station}, 1 );
+		my ( undef, $error ) = $self->checkout(
+			station => $params->{station},
+			force   => 1
+		);
 
 		if ($error) {
 			$self->render(
diff --git a/lib/Travelynx/Helper/Traewelling.pm b/lib/Travelynx/Helper/Traewelling.pm
new file mode 100644
index 0000000..3c7bec2
--- /dev/null
+++ b/lib/Travelynx/Helper/Traewelling.pm
@@ -0,0 +1,332 @@
+package Travelynx::Helper::Traewelling;
+
+use strict;
+use warnings;
+use 5.020;
+
+use Mojo::Promise;
+
+sub new {
+	my ( $class, %opt ) = @_;
+
+	my $version = $opt{version};
+
+	$opt{header}
+	  = { 'User-Agent' =>
+"travelynx/${version} on $opt{root_url} +https://finalrewind.org/projects/travelynx"
+	  };
+
+	return bless( \%opt, $class );
+}
+
+sub get_status_p {
+	my ( $self, %opt ) = @_;
+
+	my $username = $opt{username};
+	my $token    = $opt{token};
+	my $promise  = Mojo::Promise->new;
+
+	my $header = {
+		'User-Agent'    => $self->{header}{'User-Agent'},
+		'Authorization' => "Bearer $token",
+	};
+
+	$self->{user_agent}->request_timeout(20)
+	  ->get_p( "https://traewelling.de/api/v0/user/${username}" => $header )
+	  ->then(
+		sub {
+			my ($tx) = @_;
+			if ( my $err = $tx->error ) {
+				my $err_msg = "HTTP $err->{code} $err->{message}";
+				$promise->reject($err_msg);
+				return;
+			}
+			else {
+				if ( my $status = $tx->result->json->{statuses}{data}[0] ) {
+					my $strp = DateTime::Format::Strptime->new(
+						pattern   => '%Y-%m-%dT%H:%M:%S.000000Z',
+						time_zone => 'UTC',
+					);
+					my $status_id = $status->{id};
+					my $message   = $status->{body};
+					my $checkin_at
+					  = $strp->parse_datetime( $status->{created_at} );
+
+					my $dep_dt = $strp->parse_datetime(
+						$status->{train_checkin}{departure} );
+					my $arr_dt = $strp->parse_datetime(
+						$status->{train_checkin}{arrival} );
+
+					my $dep_eva
+					  = $status->{train_checkin}{origin}{ibnr};
+					my $arr_eva
+					  = $status->{train_checkin}{destination}{ibnr};
+
+					my $dep_name
+					  = $status->{train_checkin}{origin}{name};
+					my $arr_name
+					  = $status->{train_checkin}{destination}{name};
+
+					my $category
+					  = $status->{train_checkin}{hafas_trip}{category};
+					my $trip_id
+					  = $status->{train_checkin}{hafas_trip}{trip_id};
+					my $linename
+					  = $status->{train_checkin}{hafas_trip}{linename};
+					my ( $train_type, $train_line ) = split( qr{ }, $linename );
+					$promise->resolve(
+						{
+							status_id  => $status_id,
+							message    => $message,
+							checkin    => $checkin_at,
+							dep_dt     => $dep_dt,
+							dep_eva    => $dep_eva,
+							dep_name   => $dep_name,
+							arr_dt     => $arr_dt,
+							arr_eva    => $arr_eva,
+							arr_name   => $arr_name,
+							trip_id    => $trip_id,
+							train_type => $train_type,
+							line       => $linename,
+							line_no    => $train_line,
+							category   => $category,
+						}
+					);
+					return;
+				}
+				else {
+					$promise->reject("unknown error");
+					return;
+				}
+			}
+		}
+	)->catch(
+		sub {
+			my ($err) = @_;
+			$promise->reject($err);
+			return;
+		}
+	)->wait;
+
+	return $promise;
+}
+
+sub get_user_p {
+	my ( $self, $uid, $token ) = @_;
+	my $ua = $self->{user_agent}->request_timeout(20);
+
+	my $header = {
+		'User-Agent'    => $self->{header}{'User-Agent'},
+		'Authorization' => "Bearer $token",
+	};
+	my $promise = Mojo::Promise->new;
+
+	$ua->get_p( "https://traewelling.de/api/v0/getuser" => $header )->then(
+		sub {
+			my ($tx) = @_;
+			if ( my $err = $tx->error ) {
+				my $err_msg
+				  = "HTTP $err->{code} $err->{message} bei Abfrage der Nutzerdaten";
+				$promise->reject($err_msg);
+				return;
+			}
+			else {
+				my $user_data = $tx->result->json;
+				$self->{model}->set_user(
+					uid         => $uid,
+					trwl_id     => $user_data->{id},
+					screen_name => $user_data->{name},
+					user_name   => $user_data->{username},
+				);
+				$promise->resolve;
+				return;
+			}
+		}
+	)->catch(
+		sub {
+			my ($err) = @_;
+			$promise->reject("$err bei Abfrage der Nutzerdaten");
+			return;
+		}
+	)->wait;
+
+	return $promise;
+}
+
+sub login_p {
+	my ( $self, %opt ) = @_;
+
+	my $uid      = $opt{uid};
+	my $email    = $opt{email};
+	my $password = $opt{password};
+
+	my $ua = $self->{user_agent}->request_timeout(20);
+
+	my $request = {
+		email    => $email,
+		password => $password,
+	};
+
+	my $promise = Mojo::Promise->new;
+	my $token;
+
+	$ua->post_p(
+		"https://traewelling.de/api/v0/auth/login" => $self->{header} =>
+		  json                                     => $request )->then(
+		sub {
+			my ($tx) = @_;
+			if ( my $err = $tx->error ) {
+				my $err_msg = "HTTP $err->{code} $err->{message} bei Login";
+				$promise->reject($err_msg);
+				return;
+			}
+			else {
+				$token = $tx->result->json->{token};
+				$self->{model}->link(
+					uid   => $uid,
+					email => $email,
+					token => $token
+				);
+				return $self->get_user_p( $uid, $token );
+			}
+		}
+	)->then(
+		sub {
+			$promise->resolve;
+			return;
+		}
+	)->catch(
+		sub {
+			my ($err) = @_;
+			if ($token) {
+
+				# We have a token, but couldn't complete the login. For now, we
+				# solve this by logging out and invalidating the token.
+				$self->logout_p(
+					uid   => $uid,
+					token => $token
+				)->finally(
+					sub {
+						$promise->reject($err);
+						return;
+					}
+				);
+			}
+			else {
+				$promise->reject($err);
+			}
+			return;
+		}
+	)->wait;
+
+	return $promise;
+}
+
+sub logout_p {
+	my ( $self, %opt ) = @_;
+
+	my $uid   = $opt{uid};
+	my $token = $opt{token};
+
+	my $ua = $self->{user_agent}->request_timeout(20);
+
+	my $header = {
+		'User-Agent'    => $self->{header}{'User-Agent'},
+		'Authorization' => "Bearer $token",
+	};
+	my $request = {};
+
+	$self->{model}->unlink( uid => $uid );
+
+	my $promise = Mojo::Promise->new;
+
+	$ua->post_p(
+		"https://traewelling.de/api/v0/auth/logout" => $header => json =>
+		  $request )->then(
+		sub {
+			my ($tx) = @_;
+			if ( my $err = $tx->error ) {
+				my $err_msg = "HTTP $err->{code} $err->{message}";
+				$promise->reject($err_msg);
+				return;
+			}
+			else {
+				$promise->resolve;
+				return;
+			}
+		}
+	)->catch(
+		sub {
+			my ($err) = @_;
+			$promise->reject($err);
+			return;
+		}
+	)->wait;
+
+	return $promise;
+}
+
+sub checkin {
+	my ( $self, $uid ) = @_;
+	if ( my $token = $self->get_traewelling_push_token($uid) ) {
+		my $user = $self->get_user_status;
+
+# TODO delete previous traewelling status if the train's destination has been changed
+# TODO delete traewelling status when undoing a travelynx checkin
+		if ( $user->{checked_in} and $user->{extra_data}{trip_id} ) {
+			my $traewelling = $self->{model}->get($uid);
+			if ( $traewelling->{data}{trip_id} eq $user->{extra_data}{trip_id} )
+			{
+				return;
+			}
+			my $header = {
+				'User-Agent'    => 'travelynx/' . $self->{version},
+				'Authorization' => "Bearer $token",
+			};
+
+			my $request = {
+				tripID      => $user->{extra_data}{trip_id},
+				start       => q{} . $user->{dep_eva},
+				destination => q{} . $user->{arr_eva},
+			};
+			my $trip_req = sprintf(
+				"tripID=%s&lineName=%s%%20%s&start=%s",
+				$user->{extra_data}{trip_id}, $user->{train_type},
+				$user->{train_line} // $user->{train_no}, $user->{dep_eva}
+			);
+			$self->{user_agent}->request_timeout(20)
+			  ->get_p(
+				"https://traewelling.de/api/v0/trains/trip?$trip_req" =>
+				  $header )->then(
+				sub {
+					return $self->{user_agent}->request_timeout(20)
+					  ->post_p(
+						"https://traewelling.de/api/v0/trains/checkin" =>
+						  $header => json => $request );
+				}
+			)->then(
+				sub {
+					my ($tx) = @_;
+					if ( my $err = $tx->error ) {
+						my $err_msg = "HTTP $err->{code} $err->{message}";
+						$self->mark_trwl_checkin_error( $uid, $user, $err_msg );
+					}
+					else {
+  # TODO check for traewelling error ("error" key in response)
+  # TODO store ID of resulting status (request /user/{name} and store status ID)
+						$self->mark_trwl_checkin_success( $uid, $user );
+
+                      # mark success: checked into (trip_id, start, destination)
+					}
+				}
+			)->catch(
+				sub {
+					my ($err) = @_;
+					$self->mark_trwl_checkin_error( $uid, $user, $err );
+				}
+			)->wait;
+		}
+	}
+}
+
+1;
diff --git a/lib/Travelynx/Model/Traewelling.pm b/lib/Travelynx/Model/Traewelling.pm
new file mode 100644
index 0000000..7f08b0d
--- /dev/null
+++ b/lib/Travelynx/Model/Traewelling.pm
@@ -0,0 +1,204 @@
+package Travelynx::Model::Traewelling;
+
+use strict;
+use warnings;
+use 5.020;
+
+use DateTime;
+
+sub epoch_to_dt {
+	my ($epoch) = @_;
+
+	# Bugs (and user errors) may lead to undefined timestamps. Set them to
+	# 1970-01-01 to avoid crashing and show obviously wrong data instead.
+	$epoch //= 0;
+
+	return DateTime->from_epoch(
+		epoch     => $epoch,
+		time_zone => 'Europe/Berlin',
+		locale    => 'de-DE',
+	);
+
+}
+
+sub new {
+	my ( $class, %opt ) = @_;
+
+	return bless( \%opt, $class );
+}
+
+sub now {
+	return DateTime->now( time_zone => 'Europe/Berlin' );
+}
+
+sub link {
+	my ( $self, %opt ) = @_;
+
+	my $log = [ [ $self->now->epoch, "Erfolgreich angemeldet" ] ];
+
+	my $data = {
+		user_id   => $opt{uid},
+		email     => $opt{email},
+		push_sync => 0,
+		pull_sync => 0,
+		token     => $opt{token},
+		data      => JSON->new->encode( { log => $log } ),
+	};
+
+	$self->{pg}->db->insert(
+		'traewelling',
+		$data,
+		{
+			on_conflict => \
+'(user_id) do update set email = EXCLUDED.email, token = EXCLUDED.token, push_sync = false, pull_sync = false, data = null, errored = false, latest_run = null'
+		}
+	);
+
+	return $data;
+}
+
+sub set_user {
+	my ( $self, %opt ) = @_;
+
+	my $res_h
+	  = $self->{pg}
+	  ->db->select( 'traewelling', 'data', { user_id => $opt{uid} } )
+	  ->expand->hash;
+
+	$res_h->{data}{user_id}     = $opt{trwl_id};
+	$res_h->{data}{screen_name} = $opt{screen_name};
+	$res_h->{data}{user_name}   = $opt{user_name};
+
+	$self->{pg}->db->update(
+		'traewelling',
+		{ data    => JSON->new->encode( $res_h->{data} ) },
+		{ user_id => $opt{uid} }
+	);
+}
+
+sub unlink {
+	my ( $self, %opt ) = @_;
+
+	my $uid = $opt{uid};
+
+	$self->{pg}->db->delete( 'traewelling', { user_id => $uid } );
+}
+
+sub get {
+	my ( $self, $uid ) = @_;
+	$uid //= $self->current_user->{id};
+
+	my $res_h
+	  = $self->{pg}->db->select( 'traewelling_str', '*', { user_id => $uid } )
+	  ->expand->hash;
+
+	$res_h->{latest_run} = epoch_to_dt( $res_h->{latest_run_ts} );
+	for my $log_entry ( @{ $res_h->{data}{log} // [] } ) {
+		$log_entry->[0] = epoch_to_dt( $log_entry->[0] );
+	}
+
+	return $res_h;
+}
+
+sub log {
+	my ( $self, %opt ) = @_;
+	my $uid      = $opt{uid};
+	my $message  = $opt{message};
+	my $is_error = $opt{is_error};
+	my $db       = $opt{db} // $self->{pg}->db;
+	my $res_h
+	  = $db->select( 'traewelling', 'data', { user_id => $uid } )->expand->hash;
+	splice( @{ $res_h->{data}{log} // [] }, 9 );
+	unshift(
+		@{ $res_h->{data}{log} },
+		[ $self->now->epoch, $message, $opt{status_id} ]
+	);
+
+	if ($is_error) {
+		$res_h->{data}{error} = $message;
+	}
+	$db->update(
+		'traewelling',
+		{
+			errored    => $is_error ? 1 : 0,
+			latest_run => $self->now,
+			data       => JSON->new->encode( $res_h->{data} )
+		},
+		{ user_id => $uid }
+	);
+}
+
+sub set_latest_pull_status_id {
+	my ( $self, %opt ) = @_;
+	my $uid       = $opt{uid};
+	my $status_id = $opt{status_id};
+	my $db        = $opt{db} // $self->{pg}->db;
+
+	my $res_h
+	  = $db->select( 'traewelling', 'data', { user_id => $uid } )->expand->hash;
+
+	$res_h->{data}{latest_pull_status_id} = $status_id;
+
+	$db->update(
+		'traewelling',
+		{ data    => JSON->new->encode( $res_h->{data} ) },
+		{ user_id => $uid }
+	);
+}
+
+sub set_latest_push_status_id {
+	my ( $self, %opt ) = @_;
+	my $uid       = $opt{uid};
+	my $status_id = $opt{status_id};
+	my $db        = $opt{db} // $self->{pg}->db;
+
+	my $res_h
+	  = $db->select( 'traewelling', 'data', { user_id => $uid } )->expand->hash;
+
+	$res_h->{data}{latest_push_status_id} = $status_id;
+
+	$db->update(
+		'traewelling',
+		{ data    => JSON->new->encode( $res_h->{data} ) },
+		{ user_id => $uid }
+	);
+}
+
+sub set_sync {
+	my ( $self, %opt ) = @_;
+
+	my $uid       = $opt{uid};
+	my $push_sync = $opt{push_sync};
+	my $pull_sync = $opt{pull_sync};
+
+	$self->{pg}->db->update(
+		'traewelling',
+		{
+			push_sync => $push_sync,
+			pull_sync => $pull_sync
+		},
+		{ user_id => $uid }
+	);
+}
+
+sub get_push_accounts {
+	my ($self) = @_;
+	my $res = $self->{pg}->db->select(
+		'traewelling',
+		[ 'user_id', 'token', 'data' ],
+		{ push_sync => 1 }
+	);
+	return $res->expand->hashes->each;
+}
+
+sub get_pull_accounts {
+	my ($self) = @_;
+	my $res = $self->{pg}->db->select(
+		'traewelling',
+		[ 'user_id', 'token', 'data' ],
+		{ pull_sync => 1 }
+	);
+	return $res->expand->hashes->each;
+}
+
+1;