fix: network error

Author: Syn-McJ

DashWallet/Sources/UI/Explore Dash/Views/DashSpend/DashSpendPayViewModel.swift

@@ -21,13 +21,17 @@ import Combine
 private let defaultCurrency = kDefaultCurrencyCode
 
 @MainActor
-class DashSpendPayViewModel: NSObject, ObservableObject {
+class DashSpendPayViewModel: NSObject, ObservableObject, NetworkReachabilityHandling {
     private var cancellableBag = Set<AnyCancellable>()
     private let fiatFormatter = NumberFormatter.fiatFormatter(currencyCode: defaultCurrency)
     private let ctxSpendService = CTXSpendService.shared
     private let customIconProvider = CustomIconMetadataProvider.shared
     private let txMetadataDao = TransactionMetadataDAOImpl.shared
     private let sendCoinsService = SendCoinsService()
+    
+    // Network monitoring properties
+    var networkStatusDidChange: ((NetworkStatus) -> ())?
+    var reachabilityObserver: Any!
 
     private var merchantId: String = ""
     private var merchantUrl: String? = nil
@@ -120,9 +124,17 @@ class DashSpendPayViewModel: NSObject, ObservableObject {
 
         // Initialize with current sign-in state
         isUserSignedIn = ctxSpendService.isUserSignedIn
+        
+        // Set up network status change handler
+        networkStatusDidChange = { [weak self] status in
+            self?.handleNetworkStatusChange(status)
+        }
     }
 
     func subscribeToUpdates() {
+        // Start network monitoring
+        startNetworkMonitoring()
+        
         NotificationCenter.default.publisher(for: NSNotification.Name.DSWalletBalanceDidChange)
             .sink { [weak self] _ in self?.refreshBalance() }
             .store(in: &cancellableBag)
@@ -200,13 +212,20 @@ class DashSpendPayViewModel: NSObject, ObservableObject {
 
     func unsubscribeFromAll() {
         cancellableBag.removeAll()
+        stopNetworkMonitoring()
     }
 
     private func refreshBalance() {
         walletBalance = DWEnvironment.sharedInstance().currentWallet.balance
     }
 
     private func checkAmountForErrors() {
+        // Check network availability first
+        guard networkStatus == .online else {
+            error = SendAmountError.networkUnavailable
+            return
+        }
+        
         guard DWGlobalOptions.sharedInstance().isResyncingWallet == false ||
             DWEnvironment.sharedInstance().currentChainManager.syncPhase == .synced
         else {
@@ -296,4 +315,9 @@ class DashSpendPayViewModel: NSObject, ObservableObject {
         txMetadata.service = ServiceName.ctxSpend.rawValue
         txMetadataDao.update(dto: txMetadata)
     }
+    
+    private func handleNetworkStatusChange(_ status: NetworkStatus) {
+        // Re-check errors when network status changes
+        checkAmountForErrors()
+    }
 }

DashWallet/Sources/UI/Payments/Amount/Model/Send/SendAmountModel.swift

@@ -23,13 +23,15 @@ enum SendAmountError: Error, ColorizedText, LocalizedError {
     case insufficientFunds
     case insufficientMixedFunds
     case syncingChain
+    case networkUnavailable
 
     var errorDescription: String? {
         switch self {
         case .insufficientMixedFunds: return NSLocalizedString("Insufficient mixed funds. Wait for CoinJoin mixing to finish or disable this feature in the settings to complete this transaction.", comment: "Send screen")
         case .insufficientFunds: return NSLocalizedString("Insufficient funds. Please add more Dash to your wallet or reduce the amount.", comment: "Send screen")
         case .syncingChain: return NSLocalizedString("Wait until wallet is synced to complete the transaction",
                                                      comment: "Send screen")
+        case .networkUnavailable: return NSLocalizedString("Network Unavailable", comment: "Network Unavailable")
         }
     }
 
@@ -38,6 +40,7 @@ enum SendAmountError: Error, ColorizedText, LocalizedError {
         case .insufficientFunds: return .systemRed
         case .insufficientMixedFunds: return .systemRed
         case .syncingChain: return .secondaryLabel
+        case .networkUnavailable: return .secondaryLabel
         }
     }
 }