wallet: refactor a few things

damus/Components/InvoiceView.swift

@@ -11,9 +11,20 @@ func open_with_wallet(wallet: Wallet.Model, invoice: String) {
     if let url = URL(string: "\(wallet.link)\(invoice)"), UIApplication.shared.canOpenURL(url) {
         UIApplication.shared.open(url)
     } else {
-        if let url = URL(string: wallet.appStoreLink), UIApplication.shared.canOpenURL(url) {
-            UIApplication.shared.open(url)
+        guard let store_link = wallet.appStoreLink else {
+            // TODO: do something here if we don't have an appstore link
+            return
+        }
+        
+        guard let url = URL(string: store_link) else {
+            return
         }
+        
+        guard UIApplication.shared.canOpenURL(url) else {
+            return
+        }
+        
+        UIApplication.shared.open(url)
     }
 }
 

damus/Models/Wallet.swift

@@ -16,7 +16,7 @@ enum Wallet: String, CaseIterable, Identifiable {
         var tag: String
         var displayName : String
         var link : String
-        var appStoreLink : String
+        var appStoreLink : String?
         var image: String
     }
     
@@ -75,7 +75,7 @@ enum Wallet: String, CaseIterable, Identifiable {
                          appStoreLink: "https://apps.apple.com/sv/app/bitcoin-beach-wallet/id1531383905", image: "bbw")
         case .blixtwallet:
             return .init(index: 11, tag: "blixtwallet", displayName: NSLocalizedString("Blixt Wallet", comment: "Dropdown option label for Lightning wallet, Blixt Wallet"), link: "blixtwallet:lightning:",
-                         appStoreLink: "null", image: "blixt-wallet")
+                         appStoreLink: nil, image: "blixt-wallet")
         case .river:
             return .init(index: 12, tag: "river", displayName: NSLocalizedString("River", comment: "Dropdown option label for Lightning wallet, River"), link: "river://",
                          appStoreLink: "https://apps.apple.com/us/app/river-buy-mine-bitcoin/id1536176542", image: "river")

damus/Views/SelectWalletView.swift

@@ -38,14 +38,8 @@ struct SelectWalletView: View {
                 Section("Select a lightning wallet"){
                     List{
                         Button() {
-                            let walletModel = user_settings.default_wallet.model
-                            if let url = URL(string: "\(walletModel.link)\(invoice)"), UIApplication.shared.canOpenURL(url) {
-                                openURL(url)
-                            } else {
-                                if let url = URL(string: walletModel.appStoreLink), UIApplication.shared.canOpenURL(url) {
-                                    openURL(url)
-                                }
-                            }
+                            let wallet_model = user_settings.default_wallet.model
+                            open_with_wallet(wallet: wallet_model, invoice: invoice)
                         } label: {
                             HStack {
                                 Text("Default Wallet").font(.body).foregroundColor(.blue)
@@ -54,13 +48,7 @@ struct SelectWalletView: View {
                         List($allWalletModels) { $wallet in
                             if wallet.index >= 0 {
                                 Button() {
-                                    if let url = URL(string: "\(wallet.link)\(invoice)"), UIApplication.shared.canOpenURL(url) {
-                                        openURL(url)
-                                    } else {
-                                        if let url = URL(string: wallet.appStoreLink), UIApplication.shared.canOpenURL(url) {
-                                            openURL(url)
-                                        }
-                                    }
+                                    open_with_wallet(wallet: wallet, invoice: invoice)
                                 } label: {
                                     HStack {
                                         Image(wallet.image).resizable().frame(width: 32.0, height: 32.0,alignment: .center).cornerRadius(5)