using System.Windows.Threading;
using CursorLang.Models;
using CursorLang.ViewModels;

namespace CursorLang.Services;

/// <summary>
/// Manages the lifetime of the popup: the window is only responsible for showing it,
/// while the decision of when to show and when to take it down is made here.
/// </summary>
public sealed class LayoutPopupService : ILayoutPopupService, IDisposable
{
    private readonly ILayoutPopupWindow _window;
    private readonly LayoutPopupViewModel _viewModel;
    private readonly AppSettings _settings;
    private readonly DispatcherTimer _hideTimer = new();

    public LayoutPopupService(ILayoutPopupWindow window, LayoutPopupViewModel viewModel, AppSettings settings)
    {
        _window = window;
        _viewModel = viewModel;
        _settings = settings;

        _hideTimer.Tick += OnHideTimerTick;
    }

    public void Show(KeyboardLayout layout)
    {
        ShowUntilHidden(layout);

        // The duration is read on every show: it is changed in the settings on the fly.
        // Restarting the timer also prolongs the show on quick switches
        _hideTimer.Interval = _settings.Duration;
        _hideTimer.Start();
    }

    public void ShowUntilHidden(KeyboardLayout layout)
    {
        _hideTimer.Stop();

        _viewModel.ShortName = layout.ShortName;
        _window.ShowPopup();
    }

    public void Hide()
    {
        _hideTimer.Stop();
        _window.Hide();
    }

    public void Dispose()
    {
        _hideTimer.Stop();
        _hideTimer.Tick -= OnHideTimerTick;
        _window.Close();
    }

    private void OnHideTimerTick(object? sender, EventArgs e)
    {
        _hideTimer.Stop();
        _window.Hide();
    }
}