App/Sources/View Models/ContentViewModel.swift

@@ -0,0 +1,39 @@
+import SwiftData
+import SwiftUI
+
+extension ContentView {
+
+    /// View model for managing the logic for the content view.
+    ///
+    /// This observable class encapsulates the state and business logic for the main content view.
+    /// It follows the MVVM pattern to separate presentation logic from the view layer.
+    ///
+    /// The view model manages:
+    /// - Presentation state for the new task view within a sheet.
+    @Observable
+    class ViewModel {
+
+        // MARK: Properties
+
+        /// Whether the new task view should be shown.
+        var newTaskShown: Bool
+
+        // MARK: Initialization
+
+        /// Initializes a new view model instance with default values.
+        ///
+        /// The view model is initialized with:
+        /// - New task view hidden
+        init() {
+            newTaskShown = false
+        }
+
+        // MARK: Functions
+
+        /// Shows the new task view by setting the presentation state to true.
+        func showNewTask() {
+            newTaskShown = true
+        }
+
+    }
+}

App/Sources/Views/ContentView.swift

@@ -1,63 +1,52 @@
 import SwiftData
 import SwiftUI
 
+/// The main content view of the app.
+///
+/// This view serves as the primary interface for managing todo tasks.
+///
+/// The view uses a dedicated view model (`ViewModel`) to manage state and business logic, following the MVVM pattern.
+/// User interactions are handled through the view model, maintaining separation of concerns.
 struct ContentView: View {
 
-    @Environment(\.modelContext)
+    // MARK: Properties
-    private var modelContext
 
-    @Query
+    /// The view model managing the state and logic for this view.
-    private var items: [Todo]
+    @State
+    private var viewModel = ViewModel()
 
+    // MARK: Body
+
+    /// The content and behavior of the view.
+    ///
+    /// Displays a navigation view containing:
+    /// - A floating action button for adding new tasks
+    ///
+    /// The view presents a sheet when `viewModel.newTaskShown` is true,
+    /// allowing users to create new todo tasks.
     var body: some View {
-        NavigationSplitView {
+        NavigationView {
-            List {
+            ZStack(alignment: .bottomTrailing) {
-                ForEach(items) { item in
+                List {}
-                    NavigationLink {
-                        Text("Item at \(item.timestamp, format: Date.FormatStyle(date: .numeric, time: .standard))")
-                    } label: {
-                        Text(item.timestamp, format: Date.FormatStyle(date: .numeric, time: .standard))
-                    }
-                }
-                .onDelete(perform: deleteItems)
-            }
-            #if os(macOS)
-            .navigationSplitViewColumnWidth(min: 180, ideal: 200)
-            #endif
-            .toolbar {
-                #if os(iOS)
-                ToolbarItem(placement: .navigationBarTrailing) {
-                    EditButton()
-                }
-                #endif
-                ToolbarItem {
-                    Button(action: addItem) {
-                        Label("Add Item", systemImage: "plus")
-                    }
-                }
-            }
-        } detail: {
-            Text("Select an item")
-        }
-    }
 
-    private func addItem() {
+                Button(action: viewModel.showNewTask) {
-        withAnimation {
+                    Image(systemName: "plus")
-            let newItem = Todo(title: "New Todo", due: Date())
+                        .frame(width: 48, height: 48)
-            modelContext.insert(newItem)
+                        .foregroundStyle(.white)
-        }
+                }
-    }
+                .glassEffect(.regular.tint(.blue.opacity(0.8)).interactive())
-
+                .padding(.trailing, 20)
-    private func deleteItems(offsets: IndexSet) {
-        withAnimation {
-            for index in offsets {
-                modelContext.delete(items[index])
             }
+            .navigationTitle("Todos")
+        }
+        .sheet(isPresented: $viewModel.newTaskShown) {
+            NewTaskView()
         }
     }
 }
 
+// MARK: - Previews
+
 #Preview {
     ContentView()
-        .modelContainer(for: Todo.self, inMemory: true)
 }

UnitTests/Tests/View Models/ContentViewModelTests.swift

@@ -0,0 +1,36 @@
+import Foundation
+import SwiftData
+import Testing
+
+@testable import Todos
+
+@Suite("ContentView.ViewModel Tests")
+struct ContentViewModelTests {
+
+    // MARK: Initialization Tests
+
+    @Test("View model initializes with default values")
+    func initialization() {
+        // GIVEN
+        // WHEN
+        let viewModel = ContentView.ViewModel()
+
+        // THEN
+        #expect(viewModel.newTaskShown == false)
+    }
+
+    // MARK: - Functions Tests
+
+    @Test("showNewTask sets showNewTaskView to true")
+    func newTaskShown() {
+        // GIVEN
+        let viewModel = ContentView.ViewModel()
+
+        // WHEN
+        viewModel.showNewTask()
+
+        // THEN
+        #expect(viewModel.newTaskShown == true)
+    }
+
+}