feat: new homepage statistic API's (#167)

* add date format and orDefault helpers

* introduce new statistics calculations queries

* rework statistics endpoints

* code generation

* fix styles on photo card

* label and location aggregation endpoints

* code-gen

* cleanup parser and defaults

* remove debug point

* setup E2E Testing

* linters

* formatting

* fmt plus name support on time series data

* code gen

frontend/lib/api/classes/group.ts

@@ -1,5 +1,5 @@
 import { BaseAPI, route } from "../base";
-import { Group, GroupInvitation, GroupInvitationCreate, GroupStatistics, GroupUpdate } from "../types/data-contracts";
+import { Group, GroupInvitation, GroupInvitationCreate, GroupUpdate } from "../types/data-contracts";
 
 export class GroupApi extends BaseAPI {
   createInvitation(data: GroupInvitationCreate) {
@@ -21,10 +21,4 @@ export class GroupApi extends BaseAPI {
       url: route("/groups"),
     });
   }
-
-  statistics() {
-    return this.http.get<GroupStatistics>({
-      url: route("/groups/statistics"),
-    });
-  }
 }

frontend/lib/api/classes/items.ts

@@ -50,7 +50,7 @@ export class ItemsApi extends BaseAPI {
     return payload;
   }
 
-  import(file: File) {
+  import(file: File | Blob) {
     const formData = new FormData();
     formData.append("csv", file);
 

frontend/lib/api/classes/stats.ts

@@ -0,0 +1,42 @@
+import { BaseAPI, route } from "../base";
+import { GroupStatistics, TotalsByOrganizer, ValueOverTime } from "../types/data-contracts";
+
+function YYYY_DD_MM(date?: Date): string {
+  if (!date) {
+    return "";
+  }
+  // with leading zeros
+  const year = date.getFullYear();
+  const month = (date.getMonth() + 1).toString().padStart(2, "0");
+  const day = date.getDate().toString().padStart(2, "0");
+  return `${year}-${month}-${day}`;
+}
+export class StatsAPI extends BaseAPI {
+  totalPriceOverTime(start?: Date, end?: Date) {
+    return this.http.get<ValueOverTime>({
+      url: route("/groups/statistics/purchase-price", { start: YYYY_DD_MM(start), end: YYYY_DD_MM(end) }),
+    });
+  }
+
+  /**
+   * Returns ths general statistics for the group. This mostly just
+   * includes the totals for various group properties.
+   */
+  group() {
+    return this.http.get<GroupStatistics>({
+      url: route("/groups/statistics"),
+    });
+  }
+
+  labels() {
+    return this.http.get<TotalsByOrganizer[]>({
+      url: route("/groups/statistics/labels"),
+    });
+  }
+
+  locations() {
+    return this.http.get<TotalsByOrganizer[]>({
+      url: route("/groups/statistics/locations"),
+    });
+  }
+}