using System.Linq;
using System.Xml.Linq;
using Xunit;
using ytLive.Models;

namespace ytLive.Tests;

/// <summary>TASK 51 slice 5 — the creator's UI spec (2026-10-09): Remove and Blur are two pill
/// switches in the webcam's Layers properties that act as radio buttons (one on turns the other
/// off; both off = no effect), plus a strength slider.</summary>
public class WebcamBackgroundPillTests
{
    [Fact]
    public void Remove_and_Blur_pills_are_radio_exclusive_and_wired_in_the_webcam_properties()
    {
        // Behaviour: the bools the pills bind to.
        var config = new WebcamSceneConfig();
        var raised = new System.Collections.Generic.List<string?>();
        config.PropertyChanged += (_, e) => raised.Add(e.PropertyName);

        config.RemoveBackground = true;
        Assert.Equal(BackgroundEffect.Remove, config.BackgroundEffect);
        Assert.True(config.HasBackgroundEffect);

        raised.Clear();
        config.BlurBackground = true;                      // turning Blur on turns Remove off
        Assert.Equal(BackgroundEffect.Blur, config.BackgroundEffect);
        Assert.False(config.RemoveBackground);
        Assert.Contains(nameof(WebcamSceneConfig.RemoveBackground), raised); // Remove pill un-checks
        Assert.Contains(nameof(WebcamSceneConfig.BlurBackground), raised);

        config.RemoveBackground = false;                   // turning the INACTIVE pill off changes nothing
        Assert.Equal(BackgroundEffect.Blur, config.BackgroundEffect);

        config.BlurBackground = false;                     // turning the active pill off = None
        Assert.Equal(BackgroundEffect.None, config.BackgroundEffect);
        Assert.False(config.HasBackgroundEffect);

        // Wiring: the two PillToggle switches + the strength slider live in the webcam's
        // properties section of the Layers panel, bound to those properties.
        XNamespace x = "http://schemas.microsoft.com/winfx/2006/xaml";
        var doc = XDocument.Load(SourceAssert.RepoPath("Controls", "LeftPanel.xaml"));
        var webcamPanel = doc.Descendants()
            .Single(e => e.Name.LocalName == "StackPanel"
                && ((string?)e.Attribute("Visibility") ?? "").Contains("SelectedElement.IsWebcam"));

        XElement Named(string name) => webcamPanel.Descendants().Single(e => (string?)e.Attribute(x + "Name") == name);

        foreach (var (pill, property) in new[] { ("RemoveBackgroundPill", "RemoveBackground"), ("BlurBackgroundPill", "BlurBackground") })
        {
            var toggle = Named(pill);
            Assert.Equal("ToggleButton", toggle.Name.LocalName);
            Assert.Contains("PillToggle", (string?)toggle.Attribute("Style"));
            Assert.Contains($"SelectedElement.{property}", (string?)toggle.Attribute("IsChecked"));
            Assert.Contains("TwoWay", (string?)toggle.Attribute("IsChecked"));
        }

        var slider = Named("BackgroundStrengthSlider");
        Assert.Contains("SelectedElement.BackgroundStrength", (string?)slider.Attribute("Value"));
        Assert.Equal("0", (string?)slider.Attribute("Minimum"));
        Assert.Equal("1", (string?)slider.Attribute("Maximum"));
    }
}