[gnome-maps/wip/mlundblad/transit-plugin-resrobot: 2/2] WIP: add transit plugin for Resrobot

[Marcus Lundblad <mlundblad src gnome org>]

commit e7dcdaf3ecedff449b53c1532151157f549c5534
Author: Marcus Lundblad <ml update uu se>
Date:   Thu Oct 3 23:01:18 2019 +0200

    WIP: add transit plugin for Resrobot

 src/org.gnome.Maps.src.gresource.xml |   1 +
 src/transitplugins/resrobot.js       | 142 +++++++++++++++++++++++++++++++++++
 2 files changed, 143 insertions(+)
---
diff --git a/src/org.gnome.Maps.src.gresource.xml b/src/org.gnome.Maps.src.gresource.xml
index 94e5099..cabd4fa 100644
--- a/src/org.gnome.Maps.src.gresource.xml
+++ b/src/org.gnome.Maps.src.gresource.xml
@@ -112,5 +112,6 @@
     <file alias="geojsonvt/transform.js">transform.js</file>
     <file alias="geojsonvt/wrap.js">wrap.js</file>
     <file>transitplugins/openTripPlanner.js</file>
+    <file>transitplugins/resrobot.js</file>
   </gresource>
 </gresources>
diff --git a/src/transitplugins/resrobot.js b/src/transitplugins/resrobot.js
new file mode 100644
index 0000000..759aa3c
--- /dev/null
+++ b/src/transitplugins/resrobot.js
@@ -0,0 +1,142 @@
+/* -*- Mode: JS2; indent-tabs-mode: nil; js2-basic-offset: 4 -*- */
+/* vim: set et ts=4 sw=4: */
+/*
+ * Copyright (c) 2019 Marcus Lundblad
+ *
+ * GNOME Maps is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * GNOME Maps is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with GNOME Maps; if not, see <http://www.gnu.org/licenses/>.
+ *
+ * Author: Marcus Lundblad <ml update uu se>
+ */
+
+/**
+ * This module implements a transit routing plugin for the Swedish national
+ * Resrobot transit journey planning API.
+ *
+ * API docs for Resrobot can be found at:
+ * https://www.trafiklab.se/api/resrobot-reseplanerare/dokumentation/sokresa
+ */
+
+const Soup = imports.gi.Soup;
+
+const Application = imports.application;
+const HTTP = imports.http;
+const TransitPlan = imports.transitPlan;
+const Utils = imports.utils;
+
+const BASE_URL = 'https://api.resrobot.se';
+const API_VERSION = 'v2';
+
+const Products = {
+    EXPRESS_TRAIN:  2,
+    REGIONAL_TRAIN: 4,
+    EXPRESS_BUS:    8,
+    LOCAL_TRAIN:    16,
+    SUBWAY:         32,
+    TRAM:           64,
+    BUS:            128,
+    FERRY:          256
+};
+
+var Resrobot = class Resrobot {
+    constructor(params) {
+        this._session = new Soup.Session();
+        this._plan = Application.routingDelegator.transitRouter.plan;
+        this._query = Application.routeQuery;
+        this._key = params.key;
+
+        if (!this._key)
+            throw new Error('missing key');
+    }
+
+    fetchFirstResults() {
+        let query = new HTTP.Query(this._getQueryParams());
+        let uri = new Soup.URI(BASE_URL + '/' + API_VERSION + '/trip?' +
+                               query.toString());
+        let request = new Soup.Message({ method: 'GET', uri: uri });
+
+        Utils.debug('uri: ' + uri.to_string(false));
+
+        this._session.queue_message(request, (obj, message) => {
+            if (message.status_code !== Soup.Status.OK) {
+                Utils.debug('Failed to get trip');
+                //callback(null);
+            } else {
+                try {
+                    let result = JSON.parse(message.response_body.data);
+
+                    Utils.debug('result: ' + JSON.stringify(result, null, 2));
+
+                    //callback(result);
+                } catch (e) {
+                    Utils.debug('Error parsing result: ' + e);
+                    //callback(null);
+                }
+            }
+        });
+    }
+
+    _getQueryParams() {
+        let points = this._query.filledPoints;
+        let originLocation = points[0].place.location;
+        let destLocation = points.last().place.location;
+        let params = { key:             this._key,
+                       originCoordLat:  originLocation.latitude,
+                       originCoordLong: originLocation.longitude,
+                       destCoordLat:    destLocation.latitude,
+                       destCoordLong:   destLocation.longitude,
+                       format:          'json' };
+        let transitOptions = this._query.transitOptions;
+
+        if (this._query.arriveBy)
+            params.searchForArrival = 1;
+
+        if (this._query.time)
+            params.time = this._query.time;
+
+        if (this._query.date)
+            params.date = this._query.date;
+
+        if (!transitOptions.showAllTransitTypes)
+            params.products = this._getAllowedProductsForQuery();
+
+        return params;
+    }
+
+    _getAllowedProductsForQuery() {
+        let products = 0;
+
+        this._query.transitOptions.transitTypes.forEach((type) => {
+            products += this._productCodeForTransitType(type);
+        });
+
+        return products;
+    }
+
+    _productCodeForTransitType(type) {
+        switch (type) {
+            case TransitPlan.RouteType.BUS:
+                return Products.BUS + Products.EXPRESS_BUS;
+            case TransitPlan.RouteType.TRAM:
+                return Products.TRAM;
+            case TransitPlan.RouteType.TRAIN:
+                return Products.EXPRESS_TRAIN + Products.LOCAL_TRAIN;
+            case TransitPlan.RouteType.SUBWAY:
+                return Products.SUBWAY;
+            case TransitPlan.RouteType.FERRY:
+                return Products.FERRY;
+            default:
+                return 0;
+        }
+    }
+}