using Bunit;
using Marathon.UI.Components;
using Marathon.UI.Tests.Support;
using Microsoft.AspNetCore.Components;
using MudBlazor;

namespace Marathon.UI.Tests;

public sealed class ThemeToggleTests : MarathonTestContext
{
    [Fact]
    public void Toggle_flips_theme_state()
    {
        var cut = RenderComponent<TestHost>(p => p.AddChildContent<ThemeToggle>());
        Theme.IsDark.Should().BeFalse();

        cut.Find("button").Click();
        Theme.IsDark.Should().BeTrue();

        cut.Find("button").Click();
        Theme.IsDark.Should().BeFalse();
    }

    [Fact]
    public void Theme_state_notifies_subscribers_only_on_change()
    {
        var notifications = 0;
        Theme.OnChange += () => notifications++;

        Theme.Set(true);
        Theme.Set(true);   // no-op — already dark
        Theme.Set(false);

        notifications.Should().Be(2);
    }

    /// <summary>Wraps the component-under-test with MudBlazor providers
    /// so MudTooltip/MudPopover initialize correctly.</summary>
    private sealed class TestHost : ComponentBase
    {
        [Parameter] public RenderFragment? ChildContent { get; set; }

        protected override void BuildRenderTree(Microsoft.AspNetCore.Components.Rendering.RenderTreeBuilder builder)
        {
            builder.OpenComponent<MudPopoverProvider>(0);
            builder.CloseComponent();
            builder.AddContent(1, ChildContent);
        }
    }
}