namespace MauiTodo;

public partial class MainPage : ContentPage
{
    private readonly TodoDatabase database = new();
    private TodoTask? selectedTask;

    public MainPage() => InitializeComponent();

    protected override async void OnAppearing()
    {
        base.OnAppearing();
        await RefreshAsync();
    }

    private async Task RefreshAsync()
    {
        TasksView.ItemsSource = await database.GetAllAsync();
    }

    private async void OnAddClicked(object sender, EventArgs e)
    {
        string title = TaskEntry.Text?.Trim() ?? "";
        if (title.Length == 0)
        {
            await DisplayAlertAsync("Validation", "Enter a task title.", "OK");
            return;
        }
        await database.AddAsync(title);
        TaskEntry.Text = "";
        await RefreshAsync();
    }

    private void OnTaskSelectionChanged(object sender, SelectionChangedEventArgs e)
    {
        selectedTask = e.CurrentSelection.FirstOrDefault() as TodoTask;
    }

    private async void OnRemoveClicked(object sender, EventArgs e)
    {
        if (selectedTask is null)
        {
            await DisplayAlertAsync("Select a task", "Tap a task first.", "OK");
            return;
        }
        await database.DeleteAsync(selectedTask);
        selectedTask = null;
        TasksView.SelectedItem = null;
        await RefreshAsync();
    }
}