chore: improve distribution of rewardSeed (#1831)

This was previously not ideal due to float imprecision, but now it's 64 bits and there's enough entropy for all of them.

Reviewed-on: OpenWF/SpaceNinjaServer#1831
Co-authored-by: Sainan <63328889+Sainan@users.noreply.github.com>
Co-committed-by: Sainan <63328889+Sainan@users.noreply.github.com>

src/models/inventoryModels/inventoryModel.ts

@@ -390,7 +390,7 @@ MailboxSchema.set("toJSON", {
 
 const DuviriInfoSchema = new Schema<IDuviriInfo>(
     {
-        Seed: Number,
+        Seed: BigInt,
         NumCompletions: { type: Number, default: 0 }
     },
     {

src/services/inventoryService.ts

@@ -120,10 +120,15 @@ export const createInventory = async (
     }
 };
 
-export const generateRewardSeed = (): number => {
-    const min = -Number.MAX_SAFE_INTEGER;
-    const max = Number.MAX_SAFE_INTEGER;
-    return Math.floor(Math.random() * (max - min + 1)) + min;
+export const generateRewardSeed = (): bigint => {
+    const hiDword = getRandomInt(0, 0x7fffffff);
+    const loDword = getRandomInt(0, 0xffffffff);
+    let seed = (BigInt(hiDword) << 32n) | BigInt(loDword);
+    if (Math.random() < 0.5) {
+        seed *= -1n;
+        seed -= 1n;
+    }
+    return seed;
 };
 
 //TODO: RawUpgrades might need to return a LastAdded

src/types/inventoryTypes/inventoryTypes.ts

@@ -134,7 +134,7 @@ export const equipmentKeys = [
 export type TEquipmentKey = (typeof equipmentKeys)[number];
 
 export interface IDuviriInfo {
-    Seed: number;
+    Seed: bigint;
     NumCompletions: number;
 }
 
@@ -202,7 +202,7 @@ export interface IInventoryClient extends IDailyAffiliations, InventoryClientEqu
     Mailbox?: IMailboxClient;
     SubscribedToEmails: number;
     Created: IMongoDate;
-    RewardSeed: number | bigint;
+    RewardSeed: bigint;
     RegularCredits: number;
     PremiumCredits: number;
     PremiumCreditsFree: number;