From f706891bcc231a520cda2dfc00aea811c676915e Mon Sep 17 00:00:00 2001
From: Silas Boyd-Wickizer <silas@valora.xyz>
Date: Fri, 11 Aug 2023 11:47:23 -0700
Subject: [PATCH] chore: add estimated USD value to swap analytics events
 (#4060)

### Test plan

Verify properties in analytics backends.
---
 src/analytics/Properties.tsx |  4 ++++
 src/swap/saga.test.ts        |  6 ++++++
 src/swap/saga.ts             | 26 ++++++++++++++++++++++++++
 3 files changed, 36 insertions(+)

diff --git a/src/analytics/Properties.tsx b/src/analytics/Properties.tsx
index 12be2ed8b14..6c24c660758 100644
--- a/src/analytics/Properties.tsx
+++ b/src/analytics/Properties.tsx
@@ -1257,6 +1257,8 @@ interface SwapEventsProperties {
       fromTokenBalance: string
       swapExecuteTxId: string
       swapApproveTxId: string
+      estimatedSellTokenUsdValue?: number
+      estimatedBuyTokenUsdValue?: number
     }
   [SwapEvents.swap_execute_error]: SwapQuoteEvent &
     SwapTimeMetrics & {
@@ -1264,6 +1266,8 @@ interface SwapEventsProperties {
       fromTokenBalance: string
       swapExecuteTxId: string
       swapApproveTxId: string
+      estimatedSellTokenUsdValue?: number
+      estimatedBuyTokenUsdValue?: number
     }
   [SwapEvents.swap_learn_more]: undefined
   [SwapEvents.swap_price_impact_warning_displayed]: SwapEvent & {
diff --git a/src/swap/saga.test.ts b/src/swap/saga.test.ts
index 75d6a979092..fe8203c80e5 100644
--- a/src/swap/saga.test.ts
+++ b/src/swap/saga.test.ts
@@ -40,6 +40,7 @@ jest.mock('src/transactions/send', () => ({
 
 const mockSwapTransaction = {
   buyAmount: '10000000000000000',
+  sellAmount: '10000000000000000',
   buyTokenAddress: mockCeloAddress,
   sellTokenAddress: mockCeurAddress,
   price: '1',
@@ -89,6 +90,7 @@ describe(swapSubmitSaga, () => {
       [
         {
           ...mockTokenBalances[mockCeurAddress],
+          usdPrice: new BigNumber('1'),
           balance: new BigNumber('10'),
         },
       ],
@@ -129,6 +131,8 @@ describe(swapSubmitSaga, () => {
       swapExecuteTxId: 'a uuid',
       quoteToUserConfirmsSwapElapsedTimeInMs: 2500,
       quoteToTransactionElapsedTimeInMs: 10000,
+      estimatedBuyTokenUsdValue: undefined,
+      estimatedSellTokenUsdValue: 0.01,
     })
   })
 
@@ -159,6 +163,8 @@ describe(swapSubmitSaga, () => {
       swapExecuteTxId: 'a uuid',
       quoteToUserConfirmsSwapElapsedTimeInMs: 30000,
       quoteToTransactionElapsedTimeInMs: undefined,
+      estimatedBuyTokenUsdValue: undefined,
+      estimatedSellTokenUsdValue: 0.01,
     })
   })
 
diff --git a/src/swap/saga.ts b/src/swap/saga.ts
index 2e2049685b5..481c43d0095 100644
--- a/src/swap/saga.ts
+++ b/src/swap/saga.ts
@@ -54,6 +54,21 @@ function* handleSendSwapTransaction(
   yield* call(sendTransaction, txo, walletAddress, transactionContext)
 }
 
+function calculateEstimatedUsdValue({
+  tokenInfo,
+  tokenAmount,
+}: {
+  tokenInfo: TokenBalance
+  tokenAmount: string
+}): number | undefined {
+  if (!tokenInfo.usdPrice) {
+    return undefined
+  }
+
+  const amount = valueToBigNumber(tokenAmount)
+  return tokenInfo.usdPrice.times(amount.shiftedBy(-tokenInfo.decimals)).toNumber()
+}
+
 export function* swapSubmitSaga(action: PayloadAction<SwapInfo>) {
   const swapSubmittedAt = Date.now()
   const {
@@ -74,10 +89,19 @@ export function* swapSubmitSaga(action: PayloadAction<SwapInfo>) {
   const { quoteReceivedAt } = action.payload
 
   const tokenBalances: TokenBalance[] = yield* select(swappableTokensSelector)
+
   const fromToken = tokenBalances.find((token) => token.address === sellTokenAddress)
   const fromTokenBalance = fromToken
     ? fromToken.balance.shiftedBy(fromToken.decimals).toString()
     : ''
+  const estimatedSellTokenUsdValue = fromToken
+    ? calculateEstimatedUsdValue({ tokenInfo: fromToken, tokenAmount: sellAmount })
+    : undefined
+
+  const toToken = tokenBalances.find((token) => token.address === buyTokenAddress)
+  const estimatedBuyTokenUsdValue = toToken
+    ? calculateEstimatedUsdValue({ tokenInfo: toToken, tokenAmount: buyAmount })
+    : undefined
 
   const swapApproveContext = newTransactionContext(TAG, 'Swap/Approve')
   const swapExecuteContext = newTransactionContext(TAG, 'Swap/Execute')
@@ -94,6 +118,8 @@ export function* swapSubmitSaga(action: PayloadAction<SwapInfo>) {
     fromTokenBalance,
     swapExecuteTxId: swapExecuteContext.id,
     swapApproveTxId: swapApproveContext.id,
+    estimatedSellTokenUsdValue,
+    estimatedBuyTokenUsdValue,
   }
 
   let quoteToTransactionElapsedTimeInMs: number | undefined