[gnome-maps/wip/mlundblad/photon-geocode: 1/3] WIP: add Photon geocode module

[Marcus Lundblad <mlundblad src gnome org>]

commit 3f29442676d89268a875f522d7af3c7ae7e1e4fe
Author: Marcus Lundblad <ml update uu se>
Date:   Tue Apr 23 23:12:41 2019 +0200

    WIP: add Photon geocode module

 src/org.gnome.Maps.src.gresource.xml |  1 +
 src/photonGeocode.js                 | 99 ++++++++++++++++++++++++++++++++++++
 2 files changed, 100 insertions(+)
---
diff --git a/src/org.gnome.Maps.src.gresource.xml b/src/org.gnome.Maps.src.gresource.xml
index 4abd878..df2b814 100644
--- a/src/org.gnome.Maps.src.gresource.xml
+++ b/src/org.gnome.Maps.src.gresource.xml
@@ -48,6 +48,7 @@
     <file>osmTypes.js</file>
     <file>osmUtils.js</file>
     <file>overpass.js</file>
+    <file>photonGeocode.js</file>
     <file>place.js</file>
     <file>placeBubble.js</file>
     <file>placeEntry.js</file>
diff --git a/src/photonGeocode.js b/src/photonGeocode.js
new file mode 100644
index 0000000..7e010ff
--- /dev/null
+++ b/src/photonGeocode.js
@@ -0,0 +1,99 @@
+/* -*- 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>
+ */
+
+const Geocode = imports.gi.GeocodeGlib;
+const Soup = imports.gi.Soup;
+
+const HTTP = imports.http;
+const Place = imports.place;
+const Utils = imports.utils;
+
+const _BASE_URL = 'https://photon.komoot.de/api/?';
+
+var PhotonGeocode = class {
+    constructor() {
+        this._session = new Soup.Session({ user_agent : 'gnome-maps/' + pkg.version });
+    }
+
+    search(string, latitude, longitude, callback) {
+        Utils.debug('photon search: ' + string);
+        let url = this._buildURL(string, latitude, longitude);
+        let msg = Soup.Message.new('GET', url);
+        Utils.debug('URL: ' + url);
+        this._session.queue_message(msg, (session, message) => {
+            try {
+                Utils.debug('message: ' + message.response_body.data);
+                let result = this._parseMessage(message.response_body.data);
+                if (!result)
+                    callback(null, null);
+                else
+                    callback(result, null);
+            } catch (e) {
+                Utils.debug('Error: ' + e);
+                callback(null, e);
+            }
+        });
+    }
+
+    _parseMessage(message) {
+        let json = JSON.parse(message);
+        let result = [];
+        let features = json.features;
+
+        if (!features) {
+            Utils.debug('No features in response');
+            return null;
+        }
+
+        Utils.debug('number of results: ' + features.length);
+
+        features.forEach(feature => result.push(this._parseFeature(feature)));
+
+        Utils.debug('results: ' + result.length);
+
+        return result;
+    }
+
+    _parseFeature(feature) {
+        Utils.debug('_parseFeature');
+        Utils.debug('feature: ' + JSON.stringify(feature, null, 2));
+        let [lon, lat] = feature.geometry.coordinates;
+        let location = new Geocode.Location({ latitude:  lat,
+                                              longitude: lon,
+                                              accuracy:  0.0 });
+        let name = feature.properties.name;
+        Utils.debug('name: ' + name);
+        let type = Geocode.PlaceType.MISCELLANEOUS; // TODO: parse this
+        let place = new Geocode.Place({name:       name,
+                                       place_type: type,
+                                       location:   location });
+
+        return new Place.Place({ place: place });
+    }
+
+    _buildURL(string, latitude, longitude) {
+        let query = new HTTP.Query({ q:       string,
+                                     lat:     latitude,
+                                     lon:     longitude
+                                   });
+        return _BASE_URL + query.toString();
+    }
+}