✨ Add preferences dialog to enable static icon (#25)

phpmon/Domain/Preferences/Preferences.swift

@@ -0,0 +1,48 @@
+//
+//  Preferences.swift
+//  PHP Monitor
+//
+//  Created by Nico Verbruggen on 30/03/2021.
+//  Copyright © 2021 Nico Verbruggen. All rights reserved.
+//
+
+import Foundation
+
+enum PreferenceName: String {
+    case shouldDisplayDynamicIcon = "use_dynamic_icon"
+}
+
+class Preferences {
+    
+    static func handleFirstTimeLaunch() {
+        let launchedBefore = UserDefaults.standard.bool(forKey: "alreadyLaunched")
+        
+        if launchedBefore {
+            return
+        }
+        
+        UserDefaults.standard.setValue(true, forKey: PreferenceName.shouldDisplayDynamicIcon.rawValue)
+        UserDefaults.standard.setValue(true, forKey: "alreadyLaunched")
+        UserDefaults.standard.synchronize()
+    }
+    
+    static func retrieve() -> [PreferenceName: Bool] {
+        Preferences.handleFirstTimeLaunch()
+        
+        return [
+            .shouldDisplayDynamicIcon: UserDefaults.standard.bool(
+                forKey: PreferenceName.shouldDisplayDynamicIcon.rawValue
+            )
+        ]
+    }
+    
+    static var preferences: [PreferenceName: Bool] {
+        return Preferences.retrieve()
+    }
+    
+    static func update(_ preference: PreferenceName, value: Bool) {
+        UserDefaults.standard.setValue(value, forKey: preference.rawValue)
+        UserDefaults.standard.synchronize()
+    }
+    
+}