Prepare system extension support

ApplicationLibrary/Views/Dashboard/DashboardView.swift

@@ -1,12 +1,60 @@
+import Library
 import SwiftUI
 
 public struct DashboardView: View {
-    @Environment(\.extensionProfile) private var extensionProfile
+    #if os(macOS)
+        @Environment(\.controlActiveState) private var controlActiveState
+        @State private var isLoading = true
+        @State private var systemExtensionInstalled = true
+    #endif
 
     public init() {}
-
     public var body: some View {
         viewBuilder {
+            #if os(macOS)
+                if Variant.useSystemExtension {
+                    viewBuilder {
+                        if !systemExtensionInstalled {
+                            FormView {
+                                InstallSystemExtensionButton(reload)
+                            }
+                        } else {
+                            DashboardView0()
+                        }
+                    }.onAppear(perform: reload)
+                } else {
+                    DashboardView0()
+                }
+            #else
+                DashboardView0()
+            #endif
+        }
+        #if os(macOS)
+        .onChange(of: controlActiveState, perform: { newValue in
+            if newValue != .inactive {
+                if Variant.useSystemExtension {
+                    if !isLoading {
+                        reload()
+                    }
+                }
+            }
+        })
+        #endif
+        .navigationTitle("Dashboard")
+    }
+
+    #if os(macOS)
+        private func reload() {
+            Task {
+                systemExtensionInstalled = await SystemExtension.isInstalled()
+                isLoading = false
+            }
+        }
+    #endif
+
+    struct DashboardView0: View {
+        @Environment(\.extensionProfile) private var extensionProfile
+        var body: some View {
             if ApplicationLibrary.inPreview {
                 ActiveDashboardView()
             } else if let profile = extensionProfile.wrappedValue {
@@ -16,6 +64,6 @@ public struct DashboardView: View {
                     InstallProfileButton()
                 }
             }
-        }.navigationTitle("Dashboard")
+        }
     }
 }

ApplicationLibrary/Views/Dashboard/InstallSystemExtensionButton.swift

@@ -0,0 +1,45 @@
+#if os(macOS)
+
+    import Library
+    import SwiftUI
+
+    public struct InstallSystemExtensionButton: View {
+        @State private var errorPresented = false
+        @State private var errorMessage = ""
+        private let callback: () -> Void
+        public init(_ callback: @escaping () -> Void) {
+            self.callback = callback
+        }
+
+        public var body: some View {
+            Button("Install SystemExtension") {
+                Task {
+                    await installSystemExtension()
+                }
+            }
+            .alert(isPresented: $errorPresented) {
+                Alert(
+                    title: Text("Error"),
+                    message: Text(errorMessage),
+                    dismissButton: .default(Text("Ok"))
+                )
+            }
+        }
+
+        private func installSystemExtension() async {
+            do {
+                if let result = try await SystemExtension.install() {
+                    if result == .willCompleteAfterReboot {
+                        errorMessage = "Need reboot"
+                        errorPresented = true
+                    }
+                }
+                callback()
+            } catch {
+                errorMessage = error.localizedDescription
+                errorPresented = true
+            }
+        }
+    }
+
+#endif