On-Demand: Move detail text to TunnelViewModel

Signed-off-by: Roopesh Chander <roop@roopc.net>

WireGuard/WireGuard/UI/TunnelViewModel.swift

@@ -464,6 +464,18 @@ extension TunnelViewModel {
         }
     }
 
+    static func activateOnDemandDetailText(for activateOnDemandSetting: ActivateOnDemandSetting?) -> String {
+        if let activateOnDemandSetting = activateOnDemandSetting {
+            if (activateOnDemandSetting.isActivateOnDemandEnabled) {
+                return TunnelViewModel.activateOnDemandOptionText(for: activateOnDemandSetting.activateOnDemandOption)
+            } else {
+                return TunnelViewModel.activateOnDemandOptionText(for: .none)
+            }
+        } else {
+            return TunnelViewModel.activateOnDemandOptionText(for: .none)
+        }
+    }
+
     func defaultActivateOnDemandOption() -> ActivateOnDemandOption {
         return .useOnDemandOverWiFiOrCellular
     }

WireGuard/WireGuard/UI/iOS/TunnelDetailTableViewController.swift

@@ -426,26 +426,7 @@ class TunnelDetailTableViewActivateOnDemandCell: UITableViewCell {
     }
 
     func update(from activateOnDemandSetting: ActivateOnDemandSetting?) {
-        let detailText: String
+        detailTextLabel?.text = TunnelViewModel.activateOnDemandDetailText(for: activateOnDemandSetting)
-        if let activateOnDemandSetting = activateOnDemandSetting {
-            if (activateOnDemandSetting.isActivateOnDemandEnabled) {
-                switch (activateOnDemandSetting.activateOnDemandOption) {
-                case .none:
-                    detailText = "Off"
-                case .useOnDemandOverWiFiOrCellular:
-                    detailText = "Wi-Fi or cellular"
-                case .useOnDemandOverWiFiOnly:
-                    detailText = "Wi-Fi only"
-                case .useOnDemandOverCellularOnly:
-                    detailText = "Cellular only"
-                }
-            } else {
-                detailText = "Off"
-            }
-        } else {
-            detailText = "Off"
-        }
-        detailTextLabel?.text = detailText
     }
 
     override func prepareForReuse() {