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

namespace CursorLang.Tests.Services;

/// <summary>
/// The link between watching the layout and showing the tooltip.
/// </summary>
public sealed class LayoutNotificationCoordinatorTests
{
    private static readonly KeyboardLayout Russian = KeyboardLayout.FromLocaleId(0x0419);

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

        using var coordinator = new LayoutNotificationCoordinator(layouts, popup);
        coordinator.Start();

        Assert.Equal(1, layouts.StartCalls);
    }

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

        using var coordinator = new LayoutNotificationCoordinator(layouts, popup);
        coordinator.Start();

        layouts.RaiseLayoutChanged(Russian, LayoutChangeReason.UserSwitched);

        Assert.Equal([Russian], popup.Shown);
    }

    // Moving to another application changes the layout with no user involved,
    // and the tooltip would be intrusive
    [Fact]
    public void Switching_applications_shows_no_tooltip()
    {
        var layouts = new FakeKeyboardLayoutService();
        var popup = new FakeLayoutPopupService();

        using var coordinator = new LayoutNotificationCoordinator(layouts, popup);
        coordinator.Start();

        layouts.RaiseLayoutChanged(Russian, LayoutChangeReason.ApplicationSwitched);

        Assert.Empty(popup.Shown);
    }

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

        using var coordinator = new LayoutNotificationCoordinator(layouts, popup);
        coordinator.Start();

        KeyboardLayout english = KeyboardLayout.FromLocaleId(0x0409);
        layouts.RaiseLayoutChanged(Russian, LayoutChangeReason.UserSwitched);
        layouts.RaiseLayoutChanged(english, LayoutChangeReason.UserSwitched);

        Assert.Equal([Russian, english], popup.Shown);
    }

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

        using var coordinator = new LayoutNotificationCoordinator(layouts, popup);

        layouts.RaiseLayoutChanged(Russian, LayoutChangeReason.UserSwitched);

        Assert.Empty(popup.Shown);
    }

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

        var coordinator = new LayoutNotificationCoordinator(layouts, popup);
        coordinator.Start();
        coordinator.Dispose();

        Assert.Equal(1, layouts.StopCalls);
        Assert.False(layouts.HasSubscribers);

        layouts.RaiseLayoutChanged(Russian, LayoutChangeReason.UserSwitched);
        Assert.Empty(popup.Shown);
    }

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

        using var coordinator = new LayoutNotificationCoordinator(layouts, popup);
        coordinator.Start();

        layouts.RaiseLayoutChanged(Russian, LayoutChangeReason.UserSwitched);

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