map: fix init position

Signed-off-by: Varun Patil <varunpatil@ucla.edu>

appinfo/routes.php

@@ -60,6 +60,7 @@ return [
         ['name' => 'Tags#set', 'url' => '/api/tags/set/{id}', 'verb' => 'PATCH'],
 
         ['name' => 'Map#clusters', 'url' => '/api/map/clusters', 'verb' => 'GET'],
+        ['name' => 'Map#init', 'url' => '/api/map/init', 'verb' => 'GET'],
 
         ['name' => 'Archive#archive', 'url' => '/api/archive/{id}', 'verb' => 'PATCH'],
 

lib/Controller/MapController.php

@@ -65,4 +65,16 @@ class MapController extends GenericApiController
             return new JSONResponse($clusters);
         });
     }
+
+    /**
+     * @NoAdminRequired
+     */
+    public function init(): Http\Response
+    {
+        return Util::guardEx(function () {
+            return new JSONResponse([
+                'pos' => $this->timelineQuery->getMapInitialPosition(),
+            ]);
+        });
+    }
 }

lib/Db/TimelineQueryDays.php

@@ -211,7 +211,7 @@ trait TimelineQueryDays
         ?TimelineRoot $root = null,
         bool $recursive = true,
         bool $archive = false
-    ) {
+    ): IQueryBuilder {
         if (null === $root) {
             $root = $this->root();
         }

lib/Db/TimelineQueryMap.php

@@ -9,6 +9,8 @@ use OCP\IDBConnection;
 
 trait TimelineQueryMap
 {
+    use TimelineQueryDays;
+
     protected IDBConnection $connection;
 
     public function transformMapBoundsFilter(IQueryBuilder &$query, bool $aggregate, string $bounds, string $table = 'm')
@@ -121,4 +123,36 @@ trait TimelineQueryMap
 
         return $files;
     }
+
+    /**
+     * Gets the suggested initial coordinates for the map.
+     * Uses the coordinates of the newest photo (by date).
+     */
+    public function getMapInitialPosition(): ?array
+    {
+        $query = $this->connection->getQueryBuilder();
+
+        // SELECT coordinates
+        $query->select('m.lat', 'm.lon')->from('memories', 'm');
+
+        // WHERE this photo is in the user's requested folder recursively
+        $query = $this->joinFilecache($query);
+
+        // WHERE this photo has coordinates
+        $query->where($query->expr()->andX(
+            $query->expr()->isNotNull('m.lat'),
+            $query->expr()->isNotNull('m.lon')
+        ));
+
+        // ORDER BY datetaken DESC
+        $query->orderBy('m.datetaken', 'DESC');
+
+        // LIMIT 1
+        $query->setMaxResults(1);
+
+        // FETCH coordinates
+        $coords = $this->executeQueryWithCTEs($query)->fetch();
+
+        return $coords ?: null;
+    }
 }

src/components/Timeline.vue

@@ -627,12 +627,13 @@ export default defineComponent({
       }
 
       // Map Bounds
-      if (this.$route.name === "map" && this.$route.query.b) {
-        API.DAYS_FILTER(
-          query,
-          DaysFilterType.MAP_BOUNDS,
-          <string>this.$route.query.b
-        );
+      if (this.$route.name === "map") {
+        const bounds = <string>this.$route.query.b;
+        if (!bounds) {
+          throw new Error("Missing map bounds");
+        }
+
+        API.DAYS_FILTER(query, DaysFilterType.MAP_BOUNDS, bounds);
       }
 
       // Month view
@@ -699,11 +700,20 @@ export default defineComponent({
 
     /** Fetch timeline main call */
     async fetchDays(noCache = false) {
-      // Get top folders if route
+      // Awaiting this is important because the folders must render
+      // before the timeline to prevent glitches
       await this.fetchFolders();
 
       // Get URL an cache identifier
-      const url = API.Q(API.DAYS(), this.getQuery());
+      let url: string;
+      try {
+        url = API.Q(API.DAYS(), this.getQuery());
+      } catch (err) {
+        // Likely invalid route; just quit doing anything
+        return;
+      }
+
+      // URL for cached data
       const cacheUrl = <string>this.$route.name + url;
 
       // Try cache first

src/components/top-matter/MapSplitMatter.vue

@@ -110,12 +110,7 @@ export default defineComponent({
     map.mapObject.zoomControl.setPosition("topright");
 
     // Initialize
-    if (this.$route.query.b && this.$route.query.z) {
-      this.setBoundsFromQuery();
-      this.fetchClusters();
-    } else {
-      this.refresh();
-    }
+    this.initialize();
 
     // If currently dark mode, set isDark
     const pane = document.querySelector(".leaflet-tile-pane");
@@ -143,11 +138,43 @@ export default defineComponent({
 
   watch: {
     $route() {
-      this.fetchClusters();
+      this.initialize(true);
     },
   },
 
   methods: {
+    /**
+     * Get initial coordinates for display and set them.
+     * Then fetch clusters.
+     */
+    async initialize(reinit: boolean = false) {
+      // Check if we have bounds and zoom in query
+      if (this.$route.query.b && this.$route.query.z) {
+        if (!reinit) {
+          this.setBoundsFromQuery();
+        }
+        return await this.fetchClusters();
+      }
+
+      // Otherwise, get location from server
+      try {
+        const init = await axios.get<any>(API.MAP_INIT());
+
+        // Init data contains position information
+        const map = this.$refs.map as LMap;
+        const pos = init?.data?.pos;
+        if (!pos?.lat || !pos?.lon) {
+          throw new Error("No position data");
+        }
+
+        // This will trigger route change -> fetchClusters
+        map.mapObject.setView([pos.lat, pos.lon], 11);
+      } catch (e) {
+        // Make sure we initialize clusters anyway
+        this.refresh();
+      }
+    },
+
     async refreshDebounced() {
       utils.setRenewingTimeout(this, "refreshTimer", this.refresh, 250);
     },

src/services/API.ts

@@ -188,4 +188,8 @@ export class API {
   static MAP_CLUSTER_PREVIEW(id: number) {
     return tok(gen(`${BASE}/map/clusters/preview/{id}`, { id }));
   }
+
+  static MAP_INIT() {
+    return tok(gen(`${BASE}/map/init`));
+  }
 }