refactor route fetching logic for single system ID to external function

src/loaders/ApiBasedRepositoryLoader.ts

@@ -9,8 +9,8 @@ export class ApiResponseError extends Error {
 }
 
 export class ApiBasedRepositoryLoader {
-  readonly supportedSystemIds = ["263"];
-  readonly baseUrl = "https://passiogo.com/mapGetData.php";
+  supportedSystemIds = ["263"];
+  baseUrl = "https://passiogo.com/mapGetData.php";
 
   constructor(
     public repository: GetterSetterRepository,
@@ -51,43 +51,47 @@ export class ApiBasedRepositoryLoader {
     }
   }
 
-  public async fetchAndUpdateRouteDataForExistingSystems() {
+  public async fetchAndUpdateRouteDataForExistingSystemsInRepository() {
     const systems = await this.repository.getSystems();
     await Promise.all(systems.map(async (system) => {
-      const params = {
-        getRoutes: "2",
-      };
-
-      const formDataJsonObject = {
-        "systemSelected0": system.id,
-        "amount": "1",
-      }
-      const formData = new FormData();
-      formData.set("json", JSON.stringify(formDataJsonObject));
-
-      const query = new URLSearchParams(params).toString();
-      const response = await fetch(`${this.baseUrl}?${query}`, {
-        method: "POST",
-        body: formData,
-      });
-      const json = await response.json();
-
-      if (typeof json.all === "object") {
-        await Promise.all(json.all.map(async (jsonRoute: any) => {
-          const constructedRoute: IRoute = {
-            name: jsonRoute.name,
-            color: jsonRoute.color,
-            id: jsonRoute.myid,
-            polylineCoordinates: [],
-            systemId: system.id,
-          };
-
-          await this.repository.addOrUpdateRoute(constructedRoute);
-        }))
-      }
+      await this.fetchAndUpdateRouteDataForSystemId(system.id);
     }));
   }
 
+  public async fetchAndUpdateRouteDataForSystemId(systemId: string) {
+    const params = {
+      getRoutes: "2",
+    };
+
+    const formDataJsonObject = {
+      "systemSelected0": systemId,
+      "amount": "1",
+    }
+    const formData = new FormData();
+    formData.set("json", JSON.stringify(formDataJsonObject));
+
+    const query = new URLSearchParams(params).toString();
+    const response = await fetch(`${this.baseUrl}?${query}`, {
+      method: "POST",
+      body: formData,
+    });
+    const json = await response.json();
+
+    if (typeof json.all === "object") {
+      await Promise.all(json.all.map(async (jsonRoute: any) => {
+        const constructedRoute: IRoute = {
+          name: jsonRoute.name,
+          color: jsonRoute.color,
+          id: jsonRoute.myid,
+          polylineCoordinates: [],
+          systemId: systemId,
+        };
+
+        await this.repository.addOrUpdateRoute(constructedRoute);
+      }))
+    }
+  }
+
   public async fetchAndUpdateStopAndPolylineDataForRoutesInExistingSystems() {
     // Fetch from the API
     // Pass JSON output into two different methods to update repository