Admin home page #128 (#259)

* First iteration on the new PieChart component

* #128 Adds new admin home page

* Fixes code after merging conflicts

* Removes empty file

* Uses real data for admin home page, and improves style

* Reverts debugging code

* Defines missing variable

* Caches user stats data for admin home page

* Typo

* Styles improvements

* Invalidates cache on signup/signin

* Implements top 5 biggest games

* Improves styling

* Improves style

* Using generateManifest to get the proper size

* Reading data from cache

* Removes unnecessary import

* Improves caching mechanism for game sizes

* Removes lint errors

* Replaces piechart tooltip with colors in legend

* Fixes caching

* Fixes caching and slight improvement on pie chart colours

* Fixes a few bugs related to caching

* Fixes bug where app signin didn't refresh cache

* feat: style improvements

* fix: lint

---------

Co-authored-by: DecDuck <declanahofmeyr@gmail.com>

server/internal/userstats/index.ts

@@ -0,0 +1,68 @@
+/*
+Handles managing collections
+*/
+
+import cacheHandler from "../cache";
+import prisma from "../db/database";
+import { DateTime } from "luxon";
+
+class UserStatsManager {
+  // Caches the user's core library
+  private userStatsCache = cacheHandler.createCache<number>("userStats");
+
+  async cacheUserSessions() {
+    const activeSessions =
+      (
+        await prisma.client.groupBy({
+          by: ["userId"],
+          where: {
+            id: { not: "system" },
+            lastConnected: {
+              gt: DateTime.now().minus({ months: 1 }).toISO(),
+            },
+          },
+        })
+      ).length || 0;
+    await this.userStatsCache.set("activeSessions", activeSessions);
+  }
+
+  private async cacheUserCount() {
+    const userCount =
+      (await prisma.user.count({
+        where: { id: { not: "system" } },
+      })) || 0;
+    await this.userStatsCache.set("userCount", userCount);
+  }
+
+  async cacheUserStats() {
+    await this.cacheUserSessions();
+    await this.cacheUserCount();
+  }
+
+  async getUserStats() {
+    let activeSessions = await this.userStatsCache.get("activeSessions");
+    let userCount = await this.userStatsCache.get("userCount");
+
+    if (activeSessions === null || userCount === null) {
+      await this.cacheUserStats();
+      activeSessions = (await this.userStatsCache.get("activeSessions")) || 0;
+      userCount = (await this.userStatsCache.get("userCount")) || 0;
+    }
+
+    return { activeSessions, userCount };
+  }
+
+  async addUser() {
+    const userCount = (await this.userStatsCache.get("userCount")) || 0;
+    await this.userStatsCache.set("userCount", userCount + 1);
+  }
+
+  async deleteUser() {
+    const userCount = (await this.userStatsCache.get("userCount")) || 1;
+    await this.userStatsCache.set("userCount", userCount - 1);
+    await this.cacheUserSessions();
+  }
+}
+
+export const manager = new UserStatsManager();
+export default manager;