cursor-lang/CursorLang.Tests/Services/CapsLockSwitchCoordinatorTests.cs

using CursorLang.Models;
using CursorLang.Services;
using CursorLang.Tests.Infrastructure;

namespace CursorLang.Tests.Services;

/// <summary>
/// What happens on Caps Lock presses and how the interception follows the setting.
/// </summary>
public sealed class CapsLockSwitchCoordinatorTests
{
    [Fact]
    public void With_the_setting_on_the_interception_starts_at_once()
    {
        var hotkey = new FakeCapsLockHotkeyService();
        using CapsLockSwitchCoordinator coordinator = Create(hotkey, new AppSettings { UseCapsLockHotkey = true });

        coordinator.Start();

        Assert.True(hotkey.IsRunning);
        Assert.Equal(1, hotkey.StartCalls);
    }

    [Fact]
    public void With_the_setting_off_there_is_no_interception()
    {
        var hotkey = new FakeCapsLockHotkeyService();
        using CapsLockSwitchCoordinator coordinator = Create(hotkey, new AppSettings { UseCapsLockHotkey = false });

        coordinator.Start();

        Assert.False(hotkey.IsRunning);
        Assert.Equal(1, hotkey.StopCalls);
    }

    [Fact]
    public void Ticking_the_setting_turns_the_interception_on_live()
    {
        var hotkey = new FakeCapsLockHotkeyService();
        var settings = new AppSettings { UseCapsLockHotkey = false };
        using CapsLockSwitchCoordinator coordinator = Create(hotkey, settings);
        coordinator.Start();

        settings.UseCapsLockHotkey = true;

        Assert.True(hotkey.IsRunning);
    }

    [Fact]
    public void Unticking_the_setting_gives_the_key_its_usual_behaviour_back()
    {
        var hotkey = new FakeCapsLockHotkeyService();
        var settings = new AppSettings { UseCapsLockHotkey = true };
        using CapsLockSwitchCoordinator coordinator = Create(hotkey, settings);
        coordinator.Start();

        settings.UseCapsLockHotkey = false;

        Assert.False(hotkey.IsRunning);
    }

    // The interception only follows its own setting
    [Fact]
    public void Other_settings_leave_the_interception_alone()
    {
        var hotkey = new FakeCapsLockHotkeyService();
        var settings = new AppSettings { UseCapsLockHotkey = true };
        using CapsLockSwitchCoordinator coordinator = Create(hotkey, settings);
        coordinator.Start();

        int startsBefore = hotkey.StartCalls;
        int stopsBefore = hotkey.StopCalls;

        settings.FontSize = 44;
        settings.CapsLockHoldMilliseconds = 700;

        Assert.Equal(startsBefore, hotkey.StartCalls);
        Assert.Equal(stopsBefore, hotkey.StopCalls);
    }

    [Fact]
    public void A_short_press_switches_the_layout()
    {
        var hotkey = new FakeCapsLockHotkeyService();
        var layouts = new FakeKeyboardLayoutService();
        var popup = new FakeLayoutPopupService();

        using var coordinator = new CapsLockSwitchCoordinator(
            hotkey, layouts, popup, new AppSettings { UseCapsLockHotkey = true });
        coordinator.Start();

        hotkey.RaiseTapped();

        Assert.Equal(1, layouts.SwitchCalls);
        Assert.Empty(popup.Shown);
        Assert.Empty(popup.ShownUntilHidden);
    }

    // The layout stays put, but staying silent is not an option either: without
    // a tooltip a long press looks like a key that did not work
    [Fact]
    public void A_long_press_shows_the_current_layout()
    {
        var hotkey = new FakeCapsLockHotkeyService();
        var layouts = new FakeKeyboardLayoutService
        {
            CurrentLayout = KeyboardLayout.FromLocaleId(0x0419),
        };
        var popup = new FakeLayoutPopupService();

        using var coordinator = new CapsLockSwitchCoordinator(
            hotkey, layouts, popup, new AppSettings { UseCapsLockHotkey = true });
        coordinator.Start();

        hotkey.RaiseHoldStarted();

        Assert.Equal([layouts.CurrentLayout], popup.ShownUntilHidden);
        Assert.Equal(0, layouts.SwitchCalls);
    }

    [Fact]
    public void When_the_hold_ends_the_tooltip_goes_away()
    {
        var hotkey = new FakeCapsLockHotkeyService();
        var layouts = new FakeKeyboardLayoutService();
        var popup = new FakeLayoutPopupService();

        using var coordinator = new CapsLockSwitchCoordinator(
            hotkey, layouts, popup, new AppSettings { UseCapsLockHotkey = true });
        coordinator.Start();

        hotkey.RaiseHoldStarted();
        hotkey.RaiseHoldEnded();

        Assert.Equal(1, popup.HideCalls);
        Assert.Equal(0, layouts.SwitchCalls);
    }

    [Fact]
    public void Before_the_start_presses_do_nothing()
    {
        var hotkey = new FakeCapsLockHotkeyService();
        var layouts = new FakeKeyboardLayoutService();
        var popup = new FakeLayoutPopupService();

        using var coordinator = new CapsLockSwitchCoordinator(
            hotkey, layouts, popup, new AppSettings { UseCapsLockHotkey = true });

        hotkey.RaiseTapped();
        hotkey.RaiseHoldStarted();

        Assert.Equal(0, layouts.SwitchCalls);
        Assert.Empty(popup.ShownUntilHidden);
    }

    [Fact]
    public void Closing_removes_the_interception_and_unsubscribes_from_presses()
    {
        var hotkey = new FakeCapsLockHotkeyService();
        var layouts = new FakeKeyboardLayoutService();
        var settings = new AppSettings { UseCapsLockHotkey = true };

        var coordinator = new CapsLockSwitchCoordinator(
            hotkey, layouts, new FakeLayoutPopupService(), settings);
        coordinator.Start();
        coordinator.Dispose();

        Assert.False(hotkey.IsRunning);
        Assert.False(hotkey.HasSubscribers);

        hotkey.RaiseTapped();
        Assert.Equal(0, layouts.SwitchCalls);
    }

    [Fact]
    public void After_closing_the_setting_no_longer_turns_the_interception_on()
    {
        var hotkey = new FakeCapsLockHotkeyService();
        var settings = new AppSettings { UseCapsLockHotkey = false };

        CapsLockSwitchCoordinator coordinator = Create(hotkey, settings);
        coordinator.Start();
        coordinator.Dispose();

        settings.UseCapsLockHotkey = true;

        Assert.False(hotkey.IsRunning);
    }

    private static CapsLockSwitchCoordinator Create(FakeCapsLockHotkeyService hotkey, AppSettings settings) =>
        new(hotkey, new FakeKeyboardLayoutService(), new FakeLayoutPopupService(), settings);
}