feature: set feelimit percentage in settings

Library/Extensions/Localizable/ExpiryTime+Localizable.swift

@@ -12,23 +12,23 @@ extension ExpiryTime: Localizable {
     public var localized: String {
         switch self {
         case .oneMinute:
-          return L10n.ExpiryTime.oneMinute
+            return L10n.ExpiryTime.oneMinute
         case .tenMinutes:
-          return L10n.ExpiryTime.tenMinutes
+            return L10n.ExpiryTime.tenMinutes
         case .thirtyMinutes:
-          return L10n.ExpiryTime.thirtyMinutes
+            return L10n.ExpiryTime.thirtyMinutes
         case .oneHour:
-          return L10n.ExpiryTime.oneHour
+            return L10n.ExpiryTime.oneHour
         case .sixHours:
-          return L10n.ExpiryTime.sixHours
+            return L10n.ExpiryTime.sixHours
         case .oneDay:
-          return L10n.ExpiryTime.oneDay
+            return L10n.ExpiryTime.oneDay
         case .oneWeek:
-          return L10n.ExpiryTime.oneWeek
+            return L10n.ExpiryTime.oneWeek
         case .thirtyDays:
-          return L10n.ExpiryTime.thirtyDays
+            return L10n.ExpiryTime.thirtyDays
         case .oneYear:
-          return L10n.ExpiryTime.oneYear
-      }
+            return L10n.ExpiryTime.oneYear
+        }
     }
 }

Library/Extensions/Localizable/PaymentFeeLimitPercentage+Localizable.swift

@@ -0,0 +1,19 @@
+//
+//  Library
+//
+//  Created by Christopher Pinski on 10/26/19.
+//  Copyright © 2019 Zap. All rights reserved.
+//
+
+import Foundation
+
+extension PaymentFeeLimitPercentage: Localizable {
+    public var localized: String {
+        switch self {
+        case .none:
+            return L10n.PaymentFeeLimitPercentage.none
+        default:
+            return self.rawValue.formattedAsPercentage
+        }
+    }
+}

Library/Extensions/UIAlertController.swift

@@ -45,4 +45,20 @@ extension UIAlertController {
 
         return alertController
     }
+
+    static func feeLimitAlertController(message: String, sendAction: @escaping () -> Void) -> UIAlertController {
+        let title: String = L10n.Scene.Send.FeeAlert.title
+        let confirmButtonTitle: String = L10n.Scene.Send.FeeAlert.ConfirmButton.title
+
+        let alertController = UIAlertController(title: title, message: message, preferredStyle: .alert)
+        let cancelAlertAction = UIAlertAction(title: L10n.Generic.cancel, style: .cancel, handler: nil)
+
+        let confirmAlertAction = UIAlertAction(title: confirmButtonTitle, style: .default) { _ in
+            sendAction()
+        }
+        alertController.addAction(cancelAlertAction)
+        alertController.addAction(confirmAlertAction)
+
+        return alertController
+    }
 }

Library/Generated/strings.swift

@@ -155,6 +155,11 @@ internal enum L10n {
       }
     }
   }
+
+  internal enum PaymentFeeLimitPercentage {
+    /// None
+    internal static let none = L10n.tr("Localizable", "payment_fee_limit_percentage.none")
+  }
 
   internal enum RpcConnectQrcodeError {
     /// Could not read BTCPay configurations file.
@@ -633,9 +638,27 @@ internal enum L10n {
       internal static let successLabel = L10n.tr("Localizable", "scene.send.success_label")
       /// Send
       internal static let title = L10n.tr("Localizable", "scene.send.title")
+      /// The fee for this payment (%@) exceeds the limit specified in the settings (%@).
+      internal static func feeExceedsUserLimit(_ p1: String, _ p2: String) -> String {
+        return L10n.tr("Localizable", "scene.send.fee_exceeds_user_limit", p1, p2)
+      }
+      /// The fee for this payment (%@ sats) will be higher than the payment amount (%@ sats).
+      internal static func feeExceedsPayment(_ p1: String, _ p2: String) -> String {
+        return L10n.tr("Localizable", "scene.send.fee_exceeds_payment_amount", p1, p2)
+      }
+      internal enum FeeAlert {
+        /// Fee Limit Alert
+        internal static let title = L10n.tr("Localizable", "scene.send.fee_alert.title")
+        internal enum ConfirmButton {
+          /// Yes
+          internal static let title = L10n.tr("Localizable", "scene.send.fee_alert.confirm_button.title")
+        }
+      }
       internal enum Lightning {
         /// Send Lightning Payment
         internal static let title = L10n.tr("Localizable", "scene.send.lightning.title")
+        /// Do you really want to pay this invoice?
+        internal static let paymentConfirmation = L10n.tr("Localizable", "scene.send.lightning.payment_confirmation")
       }
       internal enum OnChain {
         /// Fee:
@@ -694,6 +717,8 @@ internal enum L10n {
         internal static let currency = L10n.tr("Localizable", "scene.settings.item.currency")
         /// Need Help?
         internal static let help = L10n.tr("Localizable", "scene.settings.item.help")
+        /// Lightning Payment Fee Limit
+        internal static let lightningPaymentFeeLimit = L10n.tr("Localizable", "scene.settings.item.lightning_payment_fee_limit")
         /// Lightning Request Expiry
         internal static let lightningRequestExpiry = L10n.tr("Localizable", "scene.settings.item.lightning_request_expiry")
         /// Show lnd Log

Library/Scenes/ModalDetail/Send/SendViewController.swift

@@ -11,6 +11,29 @@ import SwiftBTC
 import SwiftLnd
 import UIKit
 
+extension Formatter {
+    static let asPercentage: NumberFormatter = {
+        let formatter = NumberFormatter()
+        formatter.numberStyle = .percent
+        formatter.minimumSignificantDigits = 1
+        formatter.maximumSignificantDigits = 3
+        formatter.multiplier = 1
+        return formatter
+    }()
+}
+
+extension Int {
+    var formattedAsPercentage: String {
+        return Formatter.asPercentage.string(for: self) ?? ""
+    }
+}
+
+extension Decimal {
+    var formattedAsPercentage: String {
+        return Formatter.asPercentage.string(for: self) ?? ""
+    }
+}
+
 final class SendViewController: ModalDetailViewController {
     private let viewModel: SendViewModel
     private let authenticationViewModel: AuthenticationViewModel
@@ -87,6 +110,14 @@ final class SendViewController: ModalDetailViewController {
                 self?.amountInputView?.subtitleTextColor = $0
             }
             .dispose(in: reactive.bag)
+
+        viewModel.sendStatus.observeNext { [weak self] feeLimitPercent in
+            self?.triggerSend(feeLimitPercent: feeLimitPercent)
+        }.dispose(in: reactive.bag)
+
+        viewModel.sendStatus.observeFailed { [weak self] error in
+            self?.showFeeLimitAlert(sendError: error)
+        }.dispose(in: reactive.bag)
     }
 
     private func addAmountInputView() {
@@ -160,13 +191,40 @@ final class SendViewController: ModalDetailViewController {
     }
 
     private func sendButtonTapped() {
-        authenticate { [weak self] result in
-            switch result {
-            case .success:
-                self?.send()
-            case .failure:
-                Toast.presentError(L10n.Scene.Send.authenticationFailed)
+        viewModel.determineSendStatus()
+    }
+
+    private func showFeeLimitAlert(sendError: SendViewModel.SendError) {
+        let message: String
+        switch viewModel.method {
+        case .lightning:
+            let sendFeeLimitPercentage: Int?
+
+            switch sendError {
+            case .feeGreaterThanPayment(let feeInfo):
+                message = """
+                \(L10n.Scene.Send.feeExceedsPayment(feeInfo.feePercentage.formattedAsPercentage, feeInfo.userFeeLimitPercentage.formattedAsPercentage))
+
+                \(L10n.Scene.Send.Lightning.paymentConfirmation)
+                """
+
+                sendFeeLimitPercentage = feeInfo.sendFeeLimitPercentage
+            case .feePercentageGreaterThanUserLimit(let feeInfo):
+                message = """
+                \(L10n.Scene.Send.feeExceedsUserLimit(feeInfo.feePercentage.formattedAsPercentage, feeInfo.userFeeLimitPercentage.formattedAsPercentage))
+
+                \(L10n.Scene.Send.Lightning.paymentConfirmation)
+                """
+
+                sendFeeLimitPercentage = feeInfo.sendFeeLimitPercentage
             }
+
+            let controller = UIAlertController.feeLimitAlertController(message: message) { [weak self] in
+                self?.triggerSend(feeLimitPercent: sendFeeLimitPercentage)
+            }
+            self.present(controller, animated: true)
+        default:
+            return
         }
     }
 
@@ -252,29 +310,33 @@ final class SendViewController: ModalDetailViewController {
             self?.dismissParent()
         }
     }
-
-    private func send() {
-        let sendStartTime = Date()
-
-        presentLoading()
-
-        viewModel.send { [weak self] result in
-            let minimumLoadingTime: TimeInterval = 1
-            let sendingTime = Date().timeIntervalSince(sendStartTime)
-            let delay = max(0, minimumLoadingTime - sendingTime)
-
-            DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + delay) {
-                switch result {
-                case .success:
-
-                    self?.presentSuccess()
-                case .failure(let error):
-                    UINotificationFeedbackGenerator().notificationOccurred(.error)
-
-                    Toast.presentError(error.localizedDescription)
-                    self?.amountInputView?.isEnabled = true
-                    self?.recoverFromLoadingState()
+
+    private func triggerSend(feeLimitPercent: Int?) {
+        authenticate { [weak self] result in
+            switch result {
+            case .success:
+                self?.presentLoading()
+                let sendStartTime = Date()
+
+                self?.viewModel.send(feeLimitPercent: feeLimitPercent) { result in
+                    let minimumLoadingTime: TimeInterval = 1
+                    let sendingTime = Date().timeIntervalSince(sendStartTime)
+                    let delay = max(0, minimumLoadingTime - sendingTime)
+
+                    DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + delay) {
+                        switch result {
+                        case .success:
+                            self?.presentSuccess()
+                        case .failure(let error):
+                            UINotificationFeedbackGenerator().notificationOccurred(.error)
+                            Toast.presentError(error.localizedDescription)
+                            self?.amountInputView?.isEnabled = true
+                            self?.recoverFromLoadingState()
+                        }
+                    }
                 }
+            case .failure:
+                Toast.presentError(L10n.Scene.Send.authenticationFailed)
             }
         }
     }