Show completed task feature (#5)

This PR contains the work done to add support for showing or hiding completed todo tasks to the *Task list* view.

Reviewed-on: rock-n-code/todos-app#5
Co-authored-by: Javier Cicchelli <javier@rock-n-code.com>
Co-committed-by: Javier Cicchelli <javier@rock-n-code.com>

App/Sources/Views/TaskListView.swift

@@ -1,54 +1,60 @@
 import SwiftData
 import SwiftUI
 
-/// A view that displays all todo tasks for a specific task group.
+/// A view that displays filtered todo tasks for a specific task group.
 ///
-/// This view shows a filtered list of tasks based on the selected group (today, upcoming, past, or completed).
-/// The view uses a view model to separate business logic from presentation.
+/// This view provides the presentation layer for displaying and managing tasks within a specific group category.
+/// It follows the MVVM pattern, delegating business logic to a view model and data fetching to a separate content view.
 struct TaskListView: View {
-    
+
     // MARK: Properties
-    
-    /// Query to fetch todos filtered by the current group.
-    @Query
-    private var tasks: [Todo]
-    
-    /// The view model managing the business logic for this view.
+
+    /// The view model managing the state and business logic for this view.
+    ///
+    /// This view model holds the group configuration and completion filter state.
     @State
     private var viewModel: ViewModel
 
     // MARK: Initialization
-    
+
     /// Creates a new task list view for a specific group.
-    /// - Parameter group: The todo group to display tasks for.
+    ///
+    /// - Parameter group: The todo group category to display tasks for.
     init(group: TodoGroup) {
-        _tasks = .init(FetchDescriptor<Todo>(group: group))
         _viewModel = .init(initialValue: ViewModel(group: group))
     }
-    
+
     // MARK: Body
-    
+
     /// The content and behavior of the view.
     ///
-    /// Displays a list of tasks filtered by the current group.
+    /// Displays the task list content with navigation title and toolbar controls.
+    /// The toolbar includes a completion filter toggle for groups that support it.
     var body: some View {
-        Group {
-            if tasks.isEmpty {
-                ContentUnavailableView(
-                    "view.task-list.content-unavailable.title",
-                    systemImage: "checkmark.circle"
-                )
-            } else {
-                List {
-                    ForEach(tasks) { todo in
-                        Item(todo)
+        Content(
+            group: viewModel.group,
+            showCompleted: viewModel.showCompleted
+        )
+        .navigationTitle(viewModel.navigationTitle)
+        .toolbar {
+            if viewModel.canShowCompleted {
+                Menu {
+                    Button.init(
+                        viewModel.buttonCompleted.title,
+                        systemImage: viewModel.buttonCompleted.icon
+                    ) {
+                        viewModel.toggleCompletedVisibility()
                     }
+                } label: {
+                    Label(
+                        "view.task-list.label.actions",
+                        systemImage: "ellipsis"
+                    )
                 }
-                .listStyle(.grouped)
             }
         }
-        .navigationTitle(viewModel.navigationTitle)
     }
+
 }
 
 // MARK: - Previews