Initial code

src/helpers.ts

@@ -0,0 +1,51 @@
+import { config } from "./config.js";
+import { state } from "./store/store.js";
+import { type IUser, type TRole } from "./store/types.js";
+import type { IRank } from "./types.js";
+
+const getUserById = (userId: string): IUser => {
+    return (
+        state.users.find((user) => user.id === userId) ?? {
+            id: ":",
+            role: "NONE",
+            experience: 0,
+            lastMessageTimestamp: 0,
+        }
+    );
+};
+
+const checkRoles = (roles: TRole[], userId: string) => {
+    const user = getUserById(userId);
+    return roles.includes(user.role);
+};
+
+const getRank = (experience: number): IRank => {
+    let tmpExperience = experience;
+    let expToNextRank = config.app.experience.startingRequirement;
+    let rank = 0;
+
+    while (tmpExperience >= expToNextRank) {
+        rank++;
+        tmpExperience -= expToNextRank;
+        expToNextRank = expToNextRank *= 1.2;
+    }
+
+    return {
+        rank: rank,
+        experience: Math.floor(experience),
+        experienceInRank: Math.floor(tmpExperience),
+        expToNextRank: Math.floor(expToNextRank),
+    };
+};
+
+const getUserName = (user: IUser): string => {
+    const userPattern = /@[a-zA-Z0-9]*/;
+    const match = user.id.match(userPattern)?.at(0);
+    if (!match) {
+        return "";
+    }
+
+    return match.replaceAll("@", "");
+};
+
+export { getUserById, checkRoles, getRank, getUserName };