From dd7252bbc94f1869ad435e19f39509c521925b85 Mon Sep 17 00:00:00 2001
From: painiteleo <painiteleo@gmail.com>
Date: Mon, 13 May 2024 17:42:57 +0800
Subject: [PATCH] fix: apy calculation

---
 package.json                                  |   2 +-
 src/components/app/staking/AppStaking.tsx     |  33 ++++++++----------
 src/components/app/staking/AppStakingPane.tsx |  10 +++---
 .../app/staking/AppStakingPoolPane.tsx        |   8 ++---
 .../app/staking/AppStakingPools.tsx           |  17 ++++-----
 src/lib/getAPYCalculation.ts                  |  20 +++++++----
 .../graph/hooks/useStakingEvent/index.ts      |   2 +-
 src/services/graph/queries/staking.ts         |   2 +-
 .../build/LTokenSignaler/LTokenSignaler.wasm  | Bin 48298 -> 48334 bytes
 subgraph/build/schema.graphql                 |   2 +-
 subgraph/generated/schema.ts                  |   8 ++---
 subgraph/helper.ts                            |  15 ++++----
 subgraph/mapping.ts                           |   2 +-
 subgraph/schema.graphql                       |   2 +-
 14 files changed, 64 insertions(+), 59 deletions(-)

diff --git a/package.json b/package.json
index 4df55bd2..120bda33 100644
--- a/package.json
+++ b/package.json
@@ -5,7 +5,7 @@
     "node": ">=16.0.0"
   },
   "scripts": {
-    "dev": "NODE_ENV=production next dev",
+    "dev": "next dev",
     "build": "prisma generate && next build",
     "start": "next start",
     "lint": "next lint",
diff --git a/src/components/app/staking/AppStaking.tsx b/src/components/app/staking/AppStaking.tsx
index bfbd8f17..293bb426 100644
--- a/src/components/app/staking/AppStaking.tsx
+++ b/src/components/app/staking/AppStaking.tsx
@@ -6,11 +6,12 @@ import { AppStakingPools } from "./AppStakingPools";
 import { useContractAddress } from "@/hooks/useContractAddress";
 import { useAccount, usePublicClient } from "wagmi";
 import { zeroAddress } from "viem";
-import { useReadLdyBalanceOf, useReadLdyDecimals } from "@/generated";
+import {
+  useReadLdyBalanceOf,
+  useReadLdyDecimals,
+  useReadLdyStakingRewardPerTokenStored,
+} from "@/generated";
 import { useQueryClient } from "@tanstack/react-query";
-import { useGetStakingAprById } from "@/services/graph";
-import { STAKING_APR_INFO_ID } from "@/constants/staking";
-import { STAKING_APR_INFO_QUERY } from "@/services/graph/queries";
 
 export const AppStaking: FC = () => {
   const queryClient = useQueryClient();
@@ -25,25 +26,18 @@ export const AppStaking: FC = () => {
 
   const { data: ldyDecimals } = useReadLdyDecimals();
 
-  const {
-    data: stakingAprInfo,
-    refetch: refetchStakingAPR,
-    isFetching: isFetchingAPR,
-  } = useGetStakingAprById(STAKING_APR_INFO_ID);
+  const { data: rewardPerToken, queryKey: rewardPerTokenQuery } =
+    useReadLdyStakingRewardPerTokenStored();
 
-  // Refetch LdyBalance & APR from contract on network/wallet change
-  const queryKeys = [ldyBalanceQuery, [STAKING_APR_INFO_QUERY]];
+  // Refetch LdyBalance & RewardPerToken from contract on network/wallet change
+  const queryKeys = [ldyBalanceQuery, rewardPerTokenQuery];
   useEffect(() => {
     queryKeys.forEach((k) => queryClient.invalidateQueries({ queryKey: k }));
   }, [account.address, publicClient]);
 
-  // Refetch stakingAPR on ldyBalance change.
+  // Refetch rewardPerToken on ldyBalance change.
   useEffect(() => {
-    // Refetch after 3 seconds due to subgraph latency
-    const timeoutId = setTimeout(() => {
-      queryClient.invalidateQueries({ queryKey: [STAKING_APR_INFO_QUERY] });
-    }, 3000);
-    return () => clearTimeout(timeoutId);
+    queryClient.invalidateQueries({ queryKey: rewardPerTokenQuery });
   }, [ldyBalance]);
 
   return (
@@ -58,7 +52,7 @@ export const AppStaking: FC = () => {
           ldyTokenAddress={ldyTokenAddress || zeroAddress}
           ldyTokenBalance={ldyBalance || 0n}
           ldyTokenDecimals={ldyDecimals || 18}
-          stakingAprInfo={stakingAprInfo ? stakingAprInfo.stakingAPRInfo || undefined : undefined}
+          rewardPerToken={rewardPerToken || 0n}
         />
       </Card>
       <Card
@@ -75,8 +69,9 @@ export const AppStaking: FC = () => {
       >
         <AppStakingPools
           ldyTokenDecimals={ldyDecimals || 18}
+          ldyTokenBalance={ldyBalance || 0n}
           ldyTokenBalanceQuery={ldyBalanceQuery || []}
-          stakingAprInfo={stakingAprInfo ? stakingAprInfo.stakingAPRInfo || undefined : undefined}
+          rewardPerToken={rewardPerToken || 0n}
         />
       </Card>
     </section>
diff --git a/src/components/app/staking/AppStakingPane.tsx b/src/components/app/staking/AppStakingPane.tsx
index c9872e4d..a7c17505 100644
--- a/src/components/app/staking/AppStakingPane.tsx
+++ b/src/components/app/staking/AppStakingPane.tsx
@@ -7,20 +7,19 @@ import { useSimulateLdyStakingStake } from "@/generated";
 import * as Slider from "@radix-ui/react-slider";
 import { StakeDurations } from "@/constants/staking";
 import { getAPYCalculation } from "@/lib/getAPYCalculation";
-import { IStakingAPRInfo } from "@/services/graph/hooks/useStakingEvent";
 
 export const AppStakingPane: FC<{
   ldyTokenSymbol: string;
   ldyTokenAddress: Address;
   ldyTokenBalance: bigint;
   ldyTokenDecimals: number;
-  stakingAprInfo: IStakingAPRInfo | undefined;
+  rewardPerToken: bigint;
 }> = ({
   ldyTokenSymbol = "LDY",
   ldyTokenAddress,
   ldyTokenBalance,
   ldyTokenDecimals,
-  stakingAprInfo,
+  rewardPerToken,
 }) => {
   const ldyStakingAddress = useContractAddress("LDYStaking");
 
@@ -42,9 +41,10 @@ export const AppStakingPane: FC<{
   // Calculate APY based on stakeIndex and stakingAprInfo.
   const APY = useMemo(() => {
     return (
-      getAPYCalculation(stakingAprInfo ? stakingAprInfo.APR : "0", true, stakeOptionIndex) + "%"
+      getAPYCalculation(formatUnits(rewardPerToken, ldyTokenDecimals!), true, stakeOptionIndex) +
+      "%"
     );
-  }, [stakeOptionIndex, stakingAprInfo]);
+  }, [stakeOptionIndex, rewardPerToken]);
 
   const preparation = useSimulateLdyStakingStake({
     args: [depositedAmount, stakeOptionIndex],
diff --git a/src/components/app/staking/AppStakingPoolPane.tsx b/src/components/app/staking/AppStakingPoolPane.tsx
index 0417343e..2e00f9d4 100644
--- a/src/components/app/staking/AppStakingPoolPane.tsx
+++ b/src/components/app/staking/AppStakingPoolPane.tsx
@@ -11,7 +11,7 @@ import utc from "dayjs/plugin/utc";
 import { OneMonth } from "@/constants/staking";
 import { getAPYCalculation } from "@/lib/getAPYCalculation";
 import { QueryKey } from "@tanstack/react-query";
-import { IStakingAPRInfo, IUserStakingInfo } from "@/services/graph/hooks/useStakingEvent";
+import { IUserStakingInfo } from "@/services/graph/hooks/useStakingEvent";
 dayjs.extend(localizedFormat);
 dayjs.extend(relativeTime);
 dayjs.extend(utc);
@@ -30,7 +30,7 @@ export const AppStakingPoolPane: FC<{
   ldyTokenDecimals: number;
   userStakingInfo: IUserStakingInfo | undefined;
   rewardsArray: readonly bigint[] | undefined;
-  stakingAprInfo: IStakingAPRInfo | undefined;
+  rewardPerToken: bigint;
   getUserStakesQuery?: QueryKey;
   ldyTokenBalanceQuery?: QueryKey;
   rewardsArrayQuery?: QueryKey;
@@ -40,7 +40,7 @@ export const AppStakingPoolPane: FC<{
   ldyTokenDecimals,
   userStakingInfo,
   rewardsArray,
-  stakingAprInfo,
+  rewardPerToken,
   getUserStakesQuery,
   ldyTokenBalanceQuery,
   rewardsArrayQuery,
@@ -80,7 +80,7 @@ export const AppStakingPoolPane: FC<{
             <span>APY</span>
             <span className="font-semibold">
               {getAPYCalculation(
-                stakingAprInfo ? stakingAprInfo.APR : "0",
+                formatUnits(rewardPerToken, ldyTokenDecimals!),
                 false,
                 Number(poolInfo.duration),
               )}
diff --git a/src/components/app/staking/AppStakingPools.tsx b/src/components/app/staking/AppStakingPools.tsx
index 6926e197..0ef39826 100644
--- a/src/components/app/staking/AppStakingPools.tsx
+++ b/src/components/app/staking/AppStakingPools.tsx
@@ -8,19 +8,19 @@ import {
 } from "@/components/ui/Carousel";
 import { useGetUserStakingsByAddress } from "@/services/graph";
 import { useAccount, usePublicClient } from "wagmi";
-import { zeroAddress } from "viem";
+import { formatUnits, zeroAddress } from "viem";
 import { useReadLdyStakingGetEarnedUser, useReadLdyStakingGetUserStakes } from "@/generated";
 import { QueryKey, useQueryClient } from "@tanstack/react-query";
 import { twMerge } from "tailwind-merge";
 import { USER_STAKING_QUERY } from "@/services/graph/queries";
-import { IStakingAPRInfo } from "@/services/graph/hooks/useStakingEvent";
 import { AppStakingPoolPane } from "./AppStakingPoolPane";
 
 export const AppStakingPools: FC<{
   ldyTokenDecimals: number;
+  ldyTokenBalance: bigint;
   ldyTokenBalanceQuery: QueryKey;
-  stakingAprInfo: IStakingAPRInfo | undefined;
-}> = ({ ldyTokenDecimals, ldyTokenBalanceQuery, stakingAprInfo }) => {
+  rewardPerToken: bigint;
+}> = ({ ldyTokenDecimals, ldyTokenBalance, ldyTokenBalanceQuery, rewardPerToken }) => {
   const queryClient = useQueryClient();
   const account = useAccount();
   const publicClient = usePublicClient();
@@ -42,11 +42,11 @@ export const AppStakingPools: FC<{
     args: [account.address || zeroAddress],
   });
 
-  // Refetch staking info, earned array from subgraph & contracts on wallet, network change
-  const queryKeys = [rewardsArrayQuery, getUserStakesQuery, [USER_STAKING_QUERY]];
+  // Refetch staking info, earned array from contracts on wallet, network change
+  const queryKeys = [rewardsArrayQuery, getUserStakesQuery];
   useEffect(() => {
     queryKeys.forEach((k) => queryClient.invalidateQueries({ queryKey: k }));
-  }, [account.address, publicClient]);
+  }, [account.address, publicClient, ldyTokenBalance]);
 
   // Refetch staking info(earned info) on rewardsArray change
   useEffect(() => {
@@ -82,7 +82,8 @@ export const AppStakingPools: FC<{
                     : undefined
                 }
                 rewardsArray={rewardsArray ? rewardsArray : undefined}
-                stakingAprInfo={stakingAprInfo}
+                // stakingAprInfo={stakingAprInfo}
+                rewardPerToken={rewardPerToken}
                 getUserStakesQuery={getUserStakesQuery}
                 ldyTokenBalanceQuery={ldyTokenBalanceQuery}
                 rewardsArrayQuery={rewardsArrayQuery}
diff --git a/src/lib/getAPYCalculation.ts b/src/lib/getAPYCalculation.ts
index 5807ea2c..bcb0fbff 100644
--- a/src/lib/getAPYCalculation.ts
+++ b/src/lib/getAPYCalculation.ts
@@ -1,17 +1,23 @@
 import { StakeDurations, OneMonth } from "@/constants/staking";
 
 export const getAPYCalculation = (
-  apr: string,
+  interestRate: string,
   useStakeIndex: boolean = true,
   stakeDuration: number,
 ) => {
-  // -------- APY Formula ----------- //
-  // APY(%) = (((1 + r/n )^n) – 1)*100
-  // r: APR(annual interest rate)
-  // n: Number of compound periods
+  // -------- APR and APY Formula ----------- //
+  // R: Interest rate(reward per token)
+  // APR(%) = R * stakeDuration(ie. 1 month in sec) / 365 days(in sec) * 100
+  // N: Number of compounds
+  // APY(%) = (((1 + R/N )^N) – 1)*100
 
-  const N = useStakeIndex ? StakeDurations[stakeDuration] * OneMonth : stakeDuration;
-  const R = Number(apr);
+  const OneYear = 12 * OneMonth;
+  const Duration = useStakeIndex ? StakeDurations[stakeDuration] * OneMonth : stakeDuration;
+
+  const R = Number(interestRate);
+  const APR = (((R * Duration) / OneYear) * 100).toFixed(2);
+  console.log("APR: ", APR);
+  const N = Duration / OneYear;
   const APY = (Math.pow(1 + R / N, N) - 1) * 100;
   return APY.toFixed(2);
 };
diff --git a/src/services/graph/hooks/useStakingEvent/index.ts b/src/services/graph/hooks/useStakingEvent/index.ts
index 538242c5..4173b602 100644
--- a/src/services/graph/hooks/useStakingEvent/index.ts
+++ b/src/services/graph/hooks/useStakingEvent/index.ts
@@ -13,7 +13,7 @@ export interface IUserStakingInfo {
 export interface IStakingAPRInfo {
   rewardPerSec: string;
   totalStaked: string;
-  APR: string;
+  interestRate: string;
 }
 
 export const useGetUserStakingsByAddress = (
diff --git a/src/services/graph/queries/staking.ts b/src/services/graph/queries/staking.ts
index 03d64d68..ccfc9bf9 100644
--- a/src/services/graph/queries/staking.ts
+++ b/src/services/graph/queries/staking.ts
@@ -17,7 +17,7 @@ export const STAKING_APR_INFO_QUERY = gql`
     stakingAPRInfo(id: $stakeAprId) {
       rewardPerSec
       totalStaked
-      APR
+      interestRate
       id
     }
   }
diff --git a/subgraph/build/LTokenSignaler/LTokenSignaler.wasm b/subgraph/build/LTokenSignaler/LTokenSignaler.wasm
index 8c9c52ff2dc6e0ebebddc3cc5f7fdd70816e3789..1e79b45800e97cd5c3f932d72b5880ff057a3935 100644
GIT binary patch
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diff --git a/subgraph/build/schema.graphql b/subgraph/build/schema.graphql
index 71284343..50df301e 100644
--- a/subgraph/build/schema.graphql
+++ b/subgraph/build/schema.graphql
@@ -75,5 +75,5 @@ type StakingAPRInfo @entity {
   id: ID! # Static ID, "StakingAPRInfo"
   rewardPerSec: BigInt!
   totalStaked: BigInt!
-  APR: BigDecimal!
+  interestRate: BigDecimal! # rewardPerSec/totalStaked
 }
diff --git a/subgraph/generated/schema.ts b/subgraph/generated/schema.ts
index a1206136..cbd3868b 100644
--- a/subgraph/generated/schema.ts
+++ b/subgraph/generated/schema.ts
@@ -773,8 +773,8 @@ export class StakingAPRInfo extends Entity {
     this.set("totalStaked", Value.fromBigInt(value));
   }
 
-  get APR(): BigDecimal {
-    let value = this.get("APR");
+  get interestRate(): BigDecimal {
+    let value = this.get("interestRate");
     if (!value || value.kind == ValueKind.NULL) {
       throw new Error("Cannot return null for a required field.");
     } else {
@@ -782,8 +782,8 @@ export class StakingAPRInfo extends Entity {
     }
   }
 
-  set APR(value: BigDecimal) {
-    this.set("APR", Value.fromBigDecimal(value));
+  set interestRate(value: BigDecimal) {
+    this.set("interestRate", Value.fromBigDecimal(value));
   }
 }
 
diff --git a/subgraph/helper.ts b/subgraph/helper.ts
index 0f5033fe..c9fb612e 100644
--- a/subgraph/helper.ts
+++ b/subgraph/helper.ts
@@ -2,7 +2,10 @@ import { BigDecimal, BigInt } from "@graphprotocol/graph-ts";
 import { StakingAPRInfo } from "./generated/schema";
 
 export const STAKING_APR_INFO_ID = "STAKING_APR_INFO_ID";
-export const SECONDS_PER_YEAR = BigInt.fromI32(365 * 24 * 60 * 60);
+
+export function bigDecimalExp18(): BigDecimal {
+  return BigDecimal.fromString("1000000000000000000");
+}
 
 export function getOrCreateStakingAPRInfo(): StakingAPRInfo {
   let stakingAprInfo = StakingAPRInfo.load(STAKING_APR_INFO_ID);
@@ -10,7 +13,7 @@ export function getOrCreateStakingAPRInfo(): StakingAPRInfo {
     stakingAprInfo = new StakingAPRInfo(STAKING_APR_INFO_ID);
     stakingAprInfo.rewardPerSec = BigInt.fromI32(0);
     stakingAprInfo.totalStaked = BigInt.fromI32(0);
-    stakingAprInfo.APR = BigDecimal.fromString("0");
+    stakingAprInfo.interestRate = BigDecimal.fromString("0");
   }
   return stakingAprInfo;
 }
@@ -18,11 +21,11 @@ export function getOrCreateStakingAPRInfo(): StakingAPRInfo {
 export function updateStakingAPRInfo(): void {
   const stakingAPRInfo = getOrCreateStakingAPRInfo();
   if (stakingAPRInfo.totalStaked == BigInt.fromI32(0)) {
-    stakingAPRInfo.APR = BigDecimal.fromString("0");
+    stakingAPRInfo.interestRate = BigDecimal.fromString("0");
   } else {
-    stakingAPRInfo.APR = new BigDecimal(stakingAPRInfo.rewardPerSec)
-      .times(new BigDecimal(SECONDS_PER_YEAR))
-      .div(new BigDecimal(stakingAPRInfo.totalStaked));
+    stakingAPRInfo.interestRate = new BigDecimal(stakingAPRInfo.rewardPerSec)
+      .times(bigDecimalExp18())
+      .div(stakingAPRInfo.totalStaked.toBigDecimal());
   }
   stakingAPRInfo.save();
 }
diff --git a/subgraph/mapping.ts b/subgraph/mapping.ts
index d5d9261c..bf14ee15 100644
--- a/subgraph/mapping.ts
+++ b/subgraph/mapping.ts
@@ -25,7 +25,7 @@ import {
 import { Address, BigDecimal, BigInt } from "@graphprotocol/graph-ts";
 import { LTokenSignalEvent } from "./generated/LTokenSignaler/LTokenSignaler";
 import { store } from "@graphprotocol/graph-ts";
-import { SECONDS_PER_YEAR, getOrCreateStakingAPRInfo, updateStakingAPRInfo } from "./helper";
+import { getOrCreateStakingAPRInfo, updateStakingAPRInfo } from "./helper";
 
 export function handleSignaledLToken(event: LTokenSignalEvent): void {
   // Start indexing the signaled LToken
diff --git a/subgraph/schema.graphql b/subgraph/schema.graphql
index 71284343..50df301e 100644
--- a/subgraph/schema.graphql
+++ b/subgraph/schema.graphql
@@ -75,5 +75,5 @@ type StakingAPRInfo @entity {
   id: ID! # Static ID, "StakingAPRInfo"
   rewardPerSec: BigInt!
   totalStaked: BigInt!
-  APR: BigDecimal!
+  interestRate: BigDecimal! # rewardPerSec/totalStaked
 }