From 2140b278a01ac32f46c120237512f55242a406db Mon Sep 17 00:00:00 2001
From: elnosh <elnosh@pm.me>
Date: Wed, 4 Dec 2024 12:13:16 -0500
Subject: [PATCH] wallet - check for fee changes in keysets

---
 wallet/keyset.go | 18 +++++++++++++++++-
 wallet/wallet.go |  1 -
 2 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/wallet/keyset.go b/wallet/keyset.go
index 7e48805..16c9e62 100644
--- a/wallet/keyset.go
+++ b/wallet/keyset.go
@@ -105,11 +105,13 @@ func (w *Wallet) getActiveKeyset(mintURL string) (*crypto.WalletKeyset, error) {
 	}
 
 	activeKeyset := mint.activeKeyset
+	var activeInputFeePpk uint
 	// check if there is new active keyset
 	activeChanged := true
 	for _, keyset := range allKeysets.Keysets {
 		if keyset.Active && keyset.Id == activeKeyset.Id {
 			activeChanged = false
+			activeInputFeePpk = keyset.InputFeePpk
 			break
 		}
 	}
@@ -129,10 +131,12 @@ func (w *Wallet) getActiveKeyset(mintURL string) (*crypto.WalletKeyset, error) {
 				storedKeyset := w.db.GetKeyset(keyset.Id)
 				if storedKeyset != nil {
 					storedKeyset.Active = true
+					storedKeyset.InputFeePpk = keyset.InputFeePpk
 					if err := w.db.SaveKeyset(storedKeyset); err != nil {
 						return nil, err
 					}
-					mint.activeKeyset = *storedKeyset
+					activeKeyset = *storedKeyset
+					mint.activeKeyset = activeKeyset
 					delete(mint.inactiveKeysets, storedKeyset.Id)
 				} else {
 					keys, err := GetKeysetKeys(mintURL, keyset.Id)
@@ -158,5 +162,17 @@ func (w *Wallet) getActiveKeyset(mintURL string) (*crypto.WalletKeyset, error) {
 		}
 	}
 
+	// check if input_fee_ppk changed for current active
+	if !activeChanged {
+		if activeInputFeePpk != activeKeyset.InputFeePpk {
+			activeKeyset.InputFeePpk = activeInputFeePpk
+			if err := w.db.SaveKeyset(&activeKeyset); err != nil {
+				return nil, err
+			}
+			mint.activeKeyset = activeKeyset
+			w.mints[mintURL] = mint
+		}
+	}
+
 	return &activeKeyset, nil
 }
diff --git a/wallet/wallet.go b/wallet/wallet.go
index cf7b2af..2a3f51a 100644
--- a/wallet/wallet.go
+++ b/wallet/wallet.go
@@ -1044,7 +1044,6 @@ func (w *Wallet) selectProofsForAmount(
 	mint *walletMint,
 	includeFees bool,
 ) (cashu.Proofs, error) {
-	// TODO: need to check first if 'input_fee_ppk' for keyset has changed
 	var selectedProofs cashu.Proofs
 	var fees uint64 = 0