CP-12583: adjust delegation start date and end date (#3366)

Author: ruijialin-avalabs

packages/core-mobile/app/contexts/DelegationContext.tsx

@@ -17,10 +17,12 @@ type TransactionHash = string
 
 export type Delegate = ({
   steps,
+  startDate,
   endDate,
   nodeId
 }: {
   steps: Step[]
+  startDate: Date
   endDate: Date
   nodeId: string
 }) => Promise<TransactionHash>

packages/core-mobile/app/hooks/earn/useDelegation.ts

@@ -108,7 +108,7 @@ export const useDelegation = (): {
 
   const delegate: Delegate = useCallback(
     // eslint-disable-next-line @typescript-eslint/no-shadow
-    async ({ steps, endDate, nodeId }) => {
+    async ({ steps, startDate, endDate, nodeId }) => {
       if (activeAccount === undefined) {
         throw new Error('No active account')
       }
@@ -136,11 +136,19 @@ export const useDelegation = (): {
             // otherwise, the transaction will fail with a "Start date must be in future" error
             const delegateStartDate = new Date(Date.now() + 1 * 60 * 1000)
 
+            // get the difference in milliseconds between the original start date and the fresh start date
+            const differenceInMilliseconds =
+              delegateStartDate.getTime() - startDate.getTime()
+            // add the difference in milliseconds to the original end date, so the duration is the same as the original
+            const delegateEndDate = new Date(
+              endDate.getTime() + differenceInMilliseconds
+            )
+
             txHash = await EarnService.issueAddDelegatorTransaction({
               walletId: activeWallet.id,
               walletType: activeWallet.type,
               activeAccount,
-              endDate,
+              endDate: delegateEndDate,
               isDevMode: isDeveloperMode,
               nodeId,
               stakeAmountNanoAvax: step.amount,

packages/core-mobile/app/hooks/earn/useIssueDelegation.ts

@@ -15,10 +15,12 @@ export const useIssueDelegation = ({
 }): {
   issueDelegation: ({
     nodeId,
+    startDate,
     endDate,
     recomputeSteps
   }: {
     nodeId: string
+    startDate: Date
     endDate: Date
     recomputeSteps?: boolean
   }) => Promise<void>
@@ -28,24 +30,28 @@ export const useIssueDelegation = ({
   const mutationFn = useCallback(
     async ({
       nodeId,
+      startDate,
       endDate,
       recomputeSteps = false
     }: {
       nodeId: string
+      startDate: Date
       endDate: Date
       recomputeSteps?: boolean
     }) => {
       if (recomputeSteps) {
         const newSteps = await compute(stakeAmount.toSubUnit())
         return delegate({
           steps: newSteps,
+          startDate,
           endDate,
           nodeId
         })
       }
 
       return delegate({
         steps,
+        startDate,
         endDate,
         nodeId
       })

packages/core-mobile/app/new/routes/(signedIn)/(modals)/addStake/confirm.tsx

@@ -82,7 +82,7 @@ const StakeConfirmScreen = (): JSX.Element => {
     }
     return 0
   }, [validator?.endTime])
-  const { validatedStakingEndTime, validatedStakingDuration } =
+  const { minStartTime, validatedStakingEndTime, validatedStakingDuration } =
     useValidateStakingEndTime(stakeEndTimeInMilliseconds, validatorEndTimeUnix)
 
   const localValidatedStakingEndTime = useMemo(() => {
@@ -299,11 +299,12 @@ const StakeConfirmScreen = (): JSX.Element => {
 
       issueDelegation({
         nodeId: validator.nodeID,
+        startDate: minStartTime,
         endDate: validatedStakingEndTime,
         recomputeSteps
       })
     },
-    [issueDelegation, validatedStakingEndTime, validator]
+    [issueDelegation, minStartTime, validatedStakingEndTime, validator]
   )
 
   usePreventScreenRemoval(isIssueDelegationPending)