implement getStopsBySystemId and updateStopsForSystemId

src/repositories/ApiBasedRepository.ts

@@ -266,7 +266,59 @@ ${json}`);
   }
 
   public async getStopsBySystemId(systemId: string): Promise<IStop[]> {
-    return [];
+    await this.updateStopsForSystemId(systemId);
+
+    if (!this.cache.stopsBySystemId || this.cache.stopsBySystemId[systemId]) {
+      return [];
+    }
+    return this.cache.stopsBySystemId[systemId];
+  }
+
+  public async updateStopsForSystemId(systemId: string) {
+    try {
+      const params = {
+        getStops: "2",
+      };
+
+      const formDataJsonObject = {
+        "s0": systemId,
+        "sA": 1
+      };
+      const formData = new FormData();
+      formData.set("json", JSON.stringify(formDataJsonObject));
+
+      const query = new URLSearchParams(params).toString();
+      const response = await fetch(`${baseUrl}?${query}`, {
+        method: "POST",
+        body: formData,
+      });
+      const json = await response.json();
+
+      // TODO: update polyline data
+      // TODO: update ordered stop data
+
+      if (json.stops) {
+        const jsonStops = Object.values(json.stops);
+
+        await Promise.all(jsonStops.map(async (stop: any) => {
+          const constructedStop: IStop = {
+            name: stop.name,
+            id: stop.id,
+            systemId: systemId,
+            coordinates: {
+              latitude: parseFloat(stop.latitude),
+              longitude: parseFloat(stop.longitude),
+            },
+          };
+
+          if (this.cache.stopsBySystemId) {
+            this.cache.stopsBySystemId[systemId]?.push(constructedStop);
+          }
+        }));
+      }
+    } catch (e) {
+
+    }
   }
 
   public async getSystemById(systemId: string): Promise<ISystem| null> {
@@ -276,4 +328,5 @@ ${json}`);
   public async getSystems(): Promise<[]> {
     return Promise.resolve([]);
   }
+
 }