using System.ComponentModel;
using CursorLang.Models;

namespace CursorLang.Services;

/// <summary>
/// Превращает нажатия Caps Lock в действия: короткое — переключает раскладку,
/// длинное — только показывает подсказку. Он же включает и выключает перехват
/// вслед за галочкой в настройках.
/// </summary>
public sealed class CapsLockSwitchCoordinator : IDisposable
{
    private readonly ICapsLockHotkeyService _hotkeyService;
    private readonly IKeyboardLayoutService _layoutService;
    private readonly ILayoutPopupService _popupService;
    private readonly AppSettings _settings;

    public CapsLockSwitchCoordinator(
        ICapsLockHotkeyService hotkeyService,
        IKeyboardLayoutService layoutService,
        ILayoutPopupService popupService,
        AppSettings settings)
    {
        _hotkeyService = hotkeyService;
        _layoutService = layoutService;
        _popupService = popupService;
        _settings = settings;
    }

    public void Start()
    {
        _hotkeyService.Tapped += OnTapped;
        _hotkeyService.HoldStarted += OnHoldStarted;
        _hotkeyService.HoldEnded += OnHoldEnded;
        _settings.PropertyChanged += OnSettingsChanged;

        ApplySetting();
    }

    public void Dispose()
    {
        _settings.PropertyChanged -= OnSettingsChanged;
        _hotkeyService.Tapped -= OnTapped;
        _hotkeyService.HoldStarted -= OnHoldStarted;
        _hotkeyService.HoldEnded -= OnHoldEnded;
        _hotkeyService.Stop();
    }

    private void OnSettingsChanged(object? sender, PropertyChangedEventArgs e)
    {
        if (e.PropertyName == nameof(AppSettings.UseCapsLockHotkey))
        {
            ApplySetting();
        }
    }

    private void ApplySetting()
    {
        if (_settings.UseCapsLockHotkey)
        {
            _hotkeyService.Start();
        }
        else
        {
            _hotkeyService.Stop();
        }
    }

    private void OnTapped(object? sender, EventArgs e) => _layoutService.SwitchToNext();

    // Раскладку не меняем, но и молчать нельзя: без подсказки долгое нажатие
    // выглядит как то, что клавиша просто не сработала
    private void OnHoldStarted(object? sender, EventArgs e) =>
        _popupService.ShowUntilHidden(_layoutService.Current);

    private void OnHoldEnded(object? sender, EventArgs e) => _popupService.Hide();
}