Added stats endpoint with some basic stats (more to come) - to be tested

ref #56

src/controllers/StatsController.ts

@@ -0,0 +1,28 @@
+import { Get, JsonController } from 'routing-controllers';
+import { OpenAPI } from 'routing-controllers-openapi';
+import { getConnection } from 'typeorm';
+import { Donation } from '../models/entities/Donation';
+import { Runner } from '../models/entities/Runner';
+import { Scan } from '../models/entities/Scan';
+import { User } from '../models/entities/User';
+
+@JsonController('/stats')
+export class StatsController {
+
+    @Get()
+    @OpenAPI({ description: "A very basic stats endpoint providing basic counters for a dashboard or simmilar" })
+    async get() {
+        let connection = getConnection();
+        let runners = await connection.getRepository(Runner).find({ relations: ["scans"] });
+        let users = await connection.getRepository(User).find();
+        let scans = await connection.getRepository(Scan).find();
+        let donations = await connection.getRepository(Donation).find({ relations: ["runner", "runner.scans"] });
+        return {
+            "total_runners": runners.length,
+            "total_users": users.length,
+            "total_scans": scans.length,
+            "total_distance": runners.reduce((sum, current) => sum + current.distance, 0),
+            "total_donation_amount": donations.reduce((sum, current) => sum + current.amount, 0),
+        };
+    }
+}