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

namespace ytLive.Tests;

/// <summary>TASK 59 — the creator's properties-panel hierarchy (2026-10-21):
/// "Mirror Rect: needs a title 'Shape' above it and Rect should be selected as a default
/// if none exists … the 'drag to move' help text needs to be indented under 'Mirror Rect'
/// to show parentage … same with Geometry, Border Color, Border Thickness … Remove should
/// be indented under Background as should Blur … Strength should be indented under Blur."
///
/// <para>One test, the whole story: the shape is a CHOICE and Rect is the selected
/// default (the model), the options live under a "Shape" title with the drag hint
/// indented beneath them, every titled block owns its content one indent deeper, and the
/// strength row sits under Blur — and the TASK 57 rule still holds: the circle option is
/// not offered in the vertical Chat layout, and the model refuses it there.</para></summary>
public class PropertiesHierarchyTests
{
    [Fact]
    public void The_webcam_properties_show_a_Shape_title_with_Rect_selected_and_indent_their_content()
    {
        // ── The model: the shape is a choice, and Rect is the default ─────────
        var camera = new WebcamSceneConfig { WebcamId = "webcam-1", Name = "Webcam" };
        Assert.True(camera.IsRectShape);
        Assert.False(camera.IsRoundShape);

        camera.IsRoundShape = true;
        Assert.Equal(ClipShape.Round, camera.ClipShape);
        Assert.False(camera.IsRectShape);
        Assert.True(camera.IsRoundShape);

        camera.IsRectShape = true;
        Assert.Equal(ClipShape.Traditional, camera.ClipShape);
        Assert.True(camera.IsRectShape);
        Assert.False(camera.IsRoundShape);

        // The vertical Chat layout locks the shape to a rect — the circle option is
        // not offered there, and the model refuses it even if the UI asks.
        camera.VerticalShapeLocked = true;
        camera.IsRoundShape = true;
        Assert.Equal(ClipShape.Traditional, camera.ClipShape);
        Assert.False(camera.IsRoundShape);
        Assert.True(camera.IsRectShape);

        // ── The panel: a Shape title owns the options, the hint is indented ───
        var doc = XDocument.Load(SourceAssert.RepoPath("Controls", "LeftPanel.xaml"));

        var shapeTitle = doc.Descendants().Single(e => e.Name.LocalName == "TextBlock"
            && (string?)e.Attribute("Text") == "Shape");
        Assert.Equal("SemiBold", (string?)shapeTitle.Attribute("FontWeight"));

        var rectOption = OptionBoundTo(doc, "IsRectShape");
        var circleOption = OptionBoundTo(doc, "IsRoundShape");
        Assert.Contains("TwoWay", (string?)rectOption.Attribute("IsChecked") ?? "");

        // The CIRCLE is the option that is not offered in the vertical Chat layout.
        Assert.Contains("CanToggleClipShape", (string?)circleOption.Attribute("Visibility") ?? "");

        // Both options live under the Shape title.
        var shapeBlock = shapeTitle.Parent!;
        Assert.Contains(rectOption, shapeBlock.Descendants());
        Assert.Contains(circleOption, shapeBlock.Descendants());

        // The drag hint is indented, and it comes after the shape row — it reads as
        // part of the shape block.
        var hint = doc.Descendants().Single(e => e.Name.LocalName == "TextBlock"
            && ((string?)e.Attribute("Text") ?? "").StartsWith("Drag to move"));
        Assert.True(LeftIndent(hint) > 0, "the drag hint is not indented under the shape row");
        var siblings = shapeBlock.Parent!.Elements().ToList();
        Assert.True(siblings.IndexOf(shapeBlock) < siblings.IndexOf(hint),
            "the drag hint comes before the shape row");

        // ── Every titled block owns its content one indent deeper ────────────
        var geometryTitle = doc.Descendants()
            .Where(e => e.Name.LocalName == "TextBlock" && (string?)e.Attribute("Text") == "Geometry")
            .Single(e => ((string?)e.Parent?.Attribute("Visibility") ?? "").Contains("IsWebcamSelected"));
        Assert.Equal("SemiBold", (string?)geometryTitle.Attribute("FontWeight"));
        foreach (var row in geometryTitle.Parent!.Elements().Where(e => e.Name.LocalName == "DockPanel"))
            Assert.Equal(10, LeftIndent(row));

        // The webcam block (the one the TASK 51 test finds by its binding).
        var webcamPanel = doc.Descendants().Single(e => e.Name.LocalName == "StackPanel"
            && ((string?)e.Attribute("Visibility") ?? "").Contains("SelectedElement.IsWebcam"));

        foreach (var title in new[] { "Border Color", "Border Thickness" })
        {
            var label = webcamPanel.Descendants().Single(e => e.Name.LocalName == "TextBlock"
                && (string?)e.Attribute("Text") == title);
            Assert.Equal("SemiBold", (string?)label.Attribute("FontWeight"));
            Assert.Equal(10, LeftIndent(RowAfter(label)));
        }

        // Remove and Blur are indented under Background; Strength one level deeper,
        // under Blur.
        Assert.Equal(10, LeftIndent(RowContaining(webcamPanel, "Remove")));
        Assert.Equal(10, LeftIndent(RowContaining(webcamPanel, "Blur")));
        Assert.Equal(20, LeftIndent(RowContaining(webcamPanel, "Strength")));
    }

    /// <summary>The shape option bound to the given model property.</summary>
    private static XElement OptionBoundTo(XDocument doc, string property) =>
        doc.Descendants().Single(e => e.Name.LocalName == "ToggleButton"
            && ((string?)e.Attribute("IsChecked") ?? "").Contains(property));

    /// <summary>The row (DockPanel) that holds the given label.</summary>
    private static XElement RowContaining(XElement scope, string label) =>
        scope.Descendants().Single(e => e.Name.LocalName == "TextBlock"
            && (string?)e.Attribute("Text") == label).Parent!;

    /// <summary>The row that follows a title.</summary>
    private static XElement RowAfter(XElement title)
    {
        var next = title.ElementsAfterSelf().First(e => e.Name.LocalName == "DockPanel");
        return next;
    }

    /// <summary>The left inset of an element's Margin, in pixels.</summary>
    private static int LeftIndent(XElement element)
    {
        var margin = (string?)element.Attribute("Margin");
        if (string.IsNullOrWhiteSpace(margin)) return 0;
        var first = margin.Split(',')[0].Trim();
        return int.TryParse(first, NumberStyles.Integer, CultureInfo.InvariantCulture, out var value)
            ? value
            : 0;
    }
}