import SwiftData
import SwiftUI

extension TaskListView {

    /// View model for managing the logic for the task list view.
    ///
    /// This observable class encapsulates the state and business logic for the task list view.
    /// It follows the MVVM pattern to separate presentation logic from the view layer.
    ///
    /// ## Responsibilities
    /// - Providing the navigation title for the current group
    @Observable
    final class ViewModel {

        // MARK: Properties

        /// The task group to display tasks for.
        ///
        /// This property determines which tasks are fetched and displayed in the list.
        private let group: TodoGroup

        // MARK: Initialization

        /// Initializes a new view model instance for a specific task group.
        ///
        /// - Parameter group: The task group to display tasks for.
        init(group: TodoGroup) {
            self.group = group
        }

        // MARK: Computed

        /// The navigation title for the current task group.
        ///
        /// This computed property provides the localized title for the current group,
        /// suitable for display in a navigation bar.
        ///
        /// - Returns: The localized title key for the current group.
        var navigationTitle: LocalizedStringKey { group.title }

    }
}