Set up Analytics to track data per session (#780)

ElementX/Sources/Screens/AnalyticsSettings/AnalyticsSettingsScreenViewModel.swift

@@ -0,0 +1,45 @@
+//
+// Copyright 2022 New Vector Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+import Combine
+import SwiftUI
+
+typealias AnalyticsSettingsScreenViewModelType = StateStoreViewModel<AnalyticsSettingsScreenViewState, AnalyticsSettingsScreenViewAction>
+
+class AnalyticsSettingsScreenViewModel: AnalyticsSettingsScreenViewModelType, AnalyticsSettingsScreenViewModelProtocol {
+    init() {
+        let strings = AnalyticsSettingsScreenStrings(termsURL: ServiceLocator.shared.settings.analyticsConfiguration.termsURL)
+        let bindings = AnalyticsSettingsScreenViewStateBindings(enableAnalytics: ServiceLocator.shared.settings.enableAnalytics)
+        let state = AnalyticsSettingsScreenViewState(strings: strings, bindings: bindings)
+        
+        super.init(initialViewState: state)
+        
+        ServiceLocator.shared.settings.$enableAnalytics
+            .weakAssign(to: \.state.bindings.enableAnalytics, on: self)
+            .store(in: &cancellables)
+    }
+    
+    override func process(viewAction: AnalyticsSettingsScreenViewAction) {
+        switch viewAction {
+        case .toggleAnalytics:
+            if ServiceLocator.shared.settings.enableAnalytics {
+                ServiceLocator.shared.analytics.optOut()
+            } else {
+                ServiceLocator.shared.analytics.optIn()
+            }
+        }
+    }
+}