using System.ComponentModel;
using CursorLang.Models;

namespace CursorLang.Services;

/// <summary>
/// Turns Caps Lock presses into actions: a short one switches the layout, a long one
/// only shows the popup. It also turns the hook on and off following the checkbox in
/// the settings.
/// </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();

    // We do not change the layout, but staying silent will not do either: without the
    // popup a long press looks as if the key simply did not work
    private void OnHoldStarted(object? sender, EventArgs e) =>
        _popupService.ShowUntilHidden(_layoutService.Current);

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