Add vibrate on zap

Changelog-Added: Vibrate when a zap is received
Closes: #768

damus/Models/HomeModel.swift

@@ -144,11 +144,15 @@ class HomeModel: ObservableObject {
         if !notifications.insert_zap(zap) {
             return
         }
-        
-        handle_last_event(ev: ev, timeline: .notifications)
+
+        if handle_last_event(ev: ev, timeline: .notifications) && damus_state.settings.zap_vibration {
+            // Generate zap vibration
+            zap_vibrate(zap_amount: zap.invoice.amount)
+        }
+
         return
     }
-    
+
     func handle_zap_event(_ ev: NostrEvent) {
         // These are zap notifications
         guard let ptag = event_tag(ev, name: "p") else {
@@ -477,10 +481,14 @@ class HomeModel: ObservableObject {
         
         handle_last_event(ev: ev, timeline: .notifications)
     }
-    
-    func handle_last_event(ev: NostrEvent, timeline: Timeline, shouldNotify: Bool = true) {
+
+    @discardableResult
+    func handle_last_event(ev: NostrEvent, timeline: Timeline, shouldNotify: Bool = true) -> Bool {
         if let new_bits = handle_last_events(new_events: self.new_events, ev: ev, timeline: timeline, shouldNotify: shouldNotify) {
             new_events = new_bits
+            return true
+        } else {
+            return false
         }
     }
 
@@ -907,3 +915,16 @@ func should_show_event(contacts: Contacts, ev: NostrEvent) -> Bool {
     return ev.should_show_event
 }
 
+func zap_vibrate(zap_amount: Int64) {
+    let sats = zap_amount / 1000
+    var vibration_generator: UIImpactFeedbackGenerator
+    if sats >= 10000 {
+        vibration_generator = UIImpactFeedbackGenerator(style: .heavy)
+    } else if sats >= 1000 {
+        vibration_generator = UIImpactFeedbackGenerator(style: .medium)
+    } else {
+        vibration_generator = UIImpactFeedbackGenerator(style: .light)
+    }
+    vibration_generator.impactOccurred()
+}
+

damus/Models/UserSettingsStore.swift

@@ -101,6 +101,12 @@ class UserSettingsStore: ObservableObject {
         }
     }
 
+    @Published var zap_vibration: Bool {
+        didSet {
+            UserDefaults.standard.set(zap_vibration, forKey: "zap_vibration")
+        }
+    }
+
     @Published var translation_service: TranslationService {
         didSet {
             UserDefaults.standard.set(translation_service.rawValue, forKey: "translation_service")
@@ -178,6 +184,7 @@ class UserSettingsStore: ObservableObject {
         show_wallet_selector = should_show_wallet_selector(pubkey)
 
         left_handed = UserDefaults.standard.object(forKey: "left_handed") as? Bool ?? false
+        zap_vibration = UserDefaults.standard.object(forKey: "zap_vibration") as? Bool ?? false
         disable_animation = should_disable_image_animation()
 
         // Note from @tyiu:

damus/Views/ConfigView.swift

@@ -194,9 +194,11 @@ struct ConfigView: View {
                     }
                 }
 
-                Section(NSLocalizedString("Left Handed", comment: "Moves the post button to the left side of the screen")) {
+                Section(NSLocalizedString("Miscellaneous", comment: "Section header for miscellaneous user configuration")) {
                     Toggle(NSLocalizedString("Left Handed", comment: "Moves the post button to the left side of the screen"), isOn: $settings.left_handed)
                         .toggleStyle(.switch)
+                    Toggle(NSLocalizedString("Zap Vibration", comment: "Setting to enable vibration on zap"), isOn: $settings.zap_vibration)
+                        .toggleStyle(.switch)
                 }
 
                 Section(NSLocalizedString("Images", comment: "Section title for images configuration.")) {