feat: Introduce modular inventory item effect handling and centralize Discord interaction routing.

src/modules/inventory/effects/handlers.ts

@@ -0,0 +1,62 @@
+import { levelingService } from "@/modules/leveling/leveling.service";
+import { economyService } from "@/modules/economy/economy.service";
+import { userTimers } from "@/db/schema";
+import type { EffectHandler } from "./types";
+
+// Helper to extract duration in seconds
+const getDuration = (effect: any): number => {
+    if (effect.durationHours) return effect.durationHours * 3600;
+    if (effect.durationMinutes) return effect.durationMinutes * 60;
+    return effect.durationSeconds || 60; // Default to 60s if nothing provided
+};
+
+export const handleAddXp: EffectHandler = async (userId, effect, txFn) => {
+    await levelingService.addXp(userId, BigInt(effect.amount), txFn);
+    return `Gained ${effect.amount} XP`;
+};
+
+export const handleAddBalance: EffectHandler = async (userId, effect, txFn) => {
+    await economyService.modifyUserBalance(userId, BigInt(effect.amount), 'ITEM_USE', `Used Item`, null, txFn);
+    return `Gained ${effect.amount} 🪙`;
+};
+
+export const handleReplyMessage: EffectHandler = async (_userId, effect, _txFn) => {
+    return effect.message;
+};
+
+export const handleXpBoost: EffectHandler = async (userId, effect, txFn) => {
+    const boostDuration = getDuration(effect);
+    const expiresAt = new Date(Date.now() + boostDuration * 1000);
+    await txFn.insert(userTimers).values({
+        userId: BigInt(userId),
+        type: 'EFFECT',
+        key: 'xp_boost',
+        expiresAt: expiresAt,
+        metadata: { multiplier: effect.multiplier }
+    }).onConflictDoUpdate({
+        target: [userTimers.userId, userTimers.type, userTimers.key],
+        set: { expiresAt: expiresAt, metadata: { multiplier: effect.multiplier } }
+    });
+    return `XP Boost (${effect.multiplier}x) active for ${Math.floor(boostDuration / 60)}m`;
+};
+
+export const handleTempRole: EffectHandler = async (userId, effect, txFn) => {
+    const roleDuration = getDuration(effect);
+    const roleExpiresAt = new Date(Date.now() + roleDuration * 1000);
+    await txFn.insert(userTimers).values({
+        userId: BigInt(userId),
+        type: 'ACCESS',
+        key: `role_${effect.roleId}`,
+        expiresAt: roleExpiresAt,
+        metadata: { roleId: effect.roleId }
+    }).onConflictDoUpdate({
+        target: [userTimers.userId, userTimers.type, userTimers.key],
+        set: { expiresAt: roleExpiresAt }
+    });
+    // Actual role assignment happens in the Command layer
+    return `Temporary Role granted for ${Math.floor(roleDuration / 60)}m`;
+};
+
+export const handleColorRole: EffectHandler = async (_userId, _effect, _txFn) => {
+    return "Color Role Equipped";
+};

src/modules/inventory/effects/registry.ts

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+import {
+    handleAddXp,
+    handleAddBalance,
+    handleReplyMessage,
+    handleXpBoost,
+    handleTempRole,
+    handleColorRole
+} from "./handlers";
+import type { EffectHandler } from "./types";
+
+export const effectHandlers: Record<string, EffectHandler> = {
+    'ADD_XP': handleAddXp,
+    'ADD_BALANCE': handleAddBalance,
+    'REPLY_MESSAGE': handleReplyMessage,
+    'XP_BOOST': handleXpBoost,
+    'TEMP_ROLE': handleTempRole,
+    'COLOR_ROLE': handleColorRole
+};

src/modules/inventory/effects/types.ts

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+
+import type { Transaction } from "@/lib/types";
+
+export type EffectHandler = (userId: string, effect: any, txFn: Transaction) => Promise<string>;