refactor: convert LootdropService from class to singleton object pattern

- Move instance properties to module-level state (channelActivity, channelCooldowns)
- Convert constructor cleanup interval to module-level initialization
- Export state variables for testing
- Update tests to use direct state access instead of (service as any)
- Maintains same behavior while following project service pattern

Closes #4

shared/modules/economy/lootdrop.service.test.ts

@@ -1,5 +1,5 @@
 import { describe, it, expect, mock, beforeEach, afterEach, spyOn } from "bun:test";
-import { lootdropService } from "@shared/modules/economy/lootdrop.service";
+import { lootdropService, channelActivity, channelCooldowns } from "@shared/modules/economy/lootdrop.service";
 import { lootdrops } from "@db/schema";
 import { economyService } from "@shared/modules/economy/economy.service";
 
@@ -67,8 +67,8 @@ describe("lootdropService", () => {
         mockFrom.mockClear();
 
         // Reset internal state
-        (lootdropService as any).channelActivity = new Map();
-        (lootdropService as any).channelCooldowns = new Map();
+        channelActivity.clear();
+        channelCooldowns.clear();
 
         // Mock Math.random
         originalRandom = Math.random;

shared/modules/economy/lootdrop.service.ts

@@ -7,42 +7,32 @@ import { lootdrops } from "@db/schema";
 import { DrizzleClient } from "@shared/db/DrizzleClient";
 import { eq, and, isNull, lt } from "drizzle-orm";
 
-interface Lootdrop {
-    messageId: string;
-    channelId: string;
-    rewardAmount: number;
-    currency: string;
-    claimedBy?: string;
-    createdAt: Date;
-}
+// Module-level state (exported for testing)
+export const channelActivity: Map<string, number[]> = new Map();
+export const channelCooldowns: Map<string, number> = new Map();
 
-class LootdropService {
-    private channelActivity: Map<string, number[]> = new Map();
-    private channelCooldowns: Map<string, number> = new Map();
-
-    constructor() {
-        // Cleanup interval for activity tracking and expired lootdrops
-        setInterval(() => {
-            this.cleanupActivity();
-            this.cleanupExpiredLootdrops(true);
-        }, 60000);
-    }
-
-    private cleanupActivity() {
+// Private helper function
+function cleanupActivity() {
     const now = Date.now();
     const window = config.lootdrop.activityWindowMs;
 
-        for (const [channelId, timestamps] of this.channelActivity.entries()) {
+    for (const [channelId, timestamps] of channelActivity.entries()) {
         const validTimestamps = timestamps.filter(t => now - t < window);
         if (validTimestamps.length === 0) {
-                this.channelActivity.delete(channelId);
+            channelActivity.delete(channelId);
         } else {
-                this.channelActivity.set(channelId, validTimestamps);
+            channelActivity.set(channelId, validTimestamps);
         }
     }
 }
 
-    public async cleanupExpiredLootdrops(includeClaimed: boolean = false): Promise<number> {
+// Initialize cleanup interval on module load
+setInterval(() => {
+    cleanupActivity();
+    cleanupExpiredLootdrops(true);
+}, 60000);
+
+async function cleanupExpiredLootdrops(includeClaimed: boolean = false): Promise<number> {
     try {
         const now = new Date();
         const whereClause = includeClaimed
@@ -63,20 +53,20 @@ class LootdropService {
     }
 }
 
-    public async processMessage(message: Message) {
+async function processMessage(message: Message) {
     if (message.author.bot || !message.guild) return;
 
     const channelId = message.channel.id;
     const now = Date.now();
 
     // Check cooldown
-        const cooldown = this.channelCooldowns.get(channelId);
+    const cooldown = channelCooldowns.get(channelId);
     if (cooldown && now < cooldown) return;
 
     // Track activity
-        const timestamps = this.channelActivity.get(channelId) || [];
+    const timestamps = channelActivity.get(channelId) || [];
     timestamps.push(now);
-        this.channelActivity.set(channelId, timestamps);
+    channelActivity.set(channelId, timestamps);
 
     // Filter for window
     const window = config.lootdrop.activityWindowMs;
@@ -85,15 +75,15 @@ class LootdropService {
     if (recentActivity.length >= config.lootdrop.minMessages) {
         // Chance to spawn
         if (Math.random() < config.lootdrop.spawnChance) {
-                await this.spawnLootdrop(message.channel as TextChannel);
+            await spawnLootdrop(message.channel as TextChannel);
             // Set cooldown
-                this.channelCooldowns.set(channelId, now + config.lootdrop.cooldownMs);
-                this.channelActivity.set(channelId, []);
+            channelCooldowns.set(channelId, now + config.lootdrop.cooldownMs);
+            channelActivity.set(channelId, []);
         }
     }
 }
 
-    public async spawnLootdrop(channel: TextChannel, overrideReward?: number, overrideCurrency?: string) {
+async function spawnLootdrop(channel: TextChannel, overrideReward?: number, overrideCurrency?: string) {
     const min = config.lootdrop.reward.min;
     const max = config.lootdrop.reward.max;
     const reward = overrideReward ?? (Math.floor(Math.random() * (max - min + 1)) + min);
@@ -123,7 +113,7 @@ class LootdropService {
     }
 }
 
-    public async tryClaim(messageId: string, userId: string, username: string): Promise<{ success: boolean; amount?: number; currency?: string; error?: string }> {
+async function tryClaim(messageId: string, userId: string, username: string): Promise<{ success: boolean; amount?: number; currency?: string; error?: string }> {
     try {
         // Atomic update: Try to set claimedBy where it is currently null
         // This acts as a lock and check in one query
@@ -163,7 +153,8 @@ class LootdropService {
         return { success: false, error: "An error occurred while processing the reward." };
     }
 }
-    public getLootdropState() {
+
+function getLootdropState() {
     let hottestChannel: { id: string; messages: number; progress: number; cooldown: boolean; } | null = null;
     let maxMessages = -1;
 
@@ -171,12 +162,12 @@ class LootdropService {
     const now = Date.now();
     const required = config.lootdrop.minMessages;
 
-        for (const [channelId, timestamps] of this.channelActivity.entries()) {
+    for (const [channelId, timestamps] of channelActivity.entries()) {
         // Filter valid just to be sure we are reporting accurate numbers
         const validCount = timestamps.filter(t => now - t < window).length;
 
         // Check cooldown
-            const cooldownUntil = this.channelCooldowns.get(channelId);
+        const cooldownUntil = channelCooldowns.get(channelId);
         const isOnCooldown = !!(cooldownUntil && now < cooldownUntil);
 
         if (validCount > maxMessages) {
@@ -191,7 +182,7 @@ class LootdropService {
     }
 
     return {
-            monitoredChannels: this.channelActivity.size,
+        monitoredChannels: channelActivity.size,
         hottestChannel,
         config: {
             requiredMessages: required,
@@ -200,12 +191,13 @@ class LootdropService {
     };
 }
 
-    public async clearCaches() {
-        this.channelActivity.clear();
-        this.channelCooldowns.clear();
+async function clearCaches() {
+    channelActivity.clear();
+    channelCooldowns.clear();
     console.log("[LootdropService] Caches cleared via administrative action.");
 }
-    public async deleteLootdrop(messageId: string): Promise<boolean> {
+
+async function deleteLootdrop(messageId: string): Promise<boolean> {
     try {
         // First fetch it to get channel info so we can delete the message
         const drop = await DrizzleClient.query.lootdrops.findFirst({
@@ -235,6 +227,13 @@ class LootdropService {
         return false;
     }
 }
-}
 
-export const lootdropService = new LootdropService();
+export const lootdropService = {
+    cleanupExpiredLootdrops,
+    processMessage,
+    spawnLootdrop,
+    tryClaim,
+    getLootdropState,
+    clearCaches,
+    deleteLootdrop,
+};