todos/App/Sources/Views/ContentView.swift

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 {

    // MARK: Properties

    /// The view model managing the state and logic for this view.
    @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 {
        NavigationView {
            ZStack(alignment: .bottomTrailing) {
                TaskGroupListView()

                Button(action: viewModel.showNewTask) {
                    Image(systemName: "plus")
                        .frame(width: 48, height: 48)
                        .foregroundStyle(.white)
                }
                .glassEffect(.regular.tint(.blue.opacity(0.8)).interactive())
                .padding(.trailing, 20)
            }
            .navigationTitle("Todos")
        }
        .sheet(isPresented: $viewModel.newTaskShown) {
            NewTaskView()
        }
    }
}

// MARK: - Previews

#Preview {
    ContentView()
}