using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Windows;
using Xunit;

namespace ytLive.Tests;

/// <summary>DESIGN.md names Inter for all UI text, but a dialog is a SEPARATE WPF window: the
/// FontFamily set on MainWindow never reaches it, so every dialog still rendered Segoe UI while
/// the main window had moved on (found 2026-10-30).
///
/// <para>The theme now carries an implicit <c>Window</c> style. This test proves the mechanism on
/// a real window inside the real app — which is what catches a missing resource or a broken
/// implicit-style lookup — and asserts no dialog opts out by setting FontFamily itself.</para></summary>
[Collection("RealApp")]
public class DialogTypographyTests
{
    private readonly RealAppHost _app;

    public DialogTypographyTests(RealAppHost app) => _app = app;

    [Fact]
    public void A_window_inherits_the_standard_typeface_and_no_dialog_opts_out()
    {
        // 1. The mechanism: any Window opened in the app resolves the token family. Dialogs are
        //    Windows; proving it once here covers all of them, and it fails if the implicit style
        //    or the font resource ever goes missing.
        _app.Run(() =>
        {
            var window = new Window();
            window.Show();
            try
            {
                Assert.Contains("Inter", window.FontFamily?.Source ?? string.Empty,
                    StringComparison.OrdinalIgnoreCase);
            }
            finally { window.Close(); }
        });

        // 2. Opt-outs: a dialog that sets FontFamily itself would silently leave the standard.
        foreach (var file in DialogFiles())
            Assert.DoesNotContain("FontFamily=", File.ReadAllText(file));
    }

    private static IEnumerable<string> DialogFiles()
    {
        var root = Path.GetDirectoryName(SourceAssert.RepoPath("App.xaml"))!;
        return Directory.EnumerateFiles(root, "*.xaml", SearchOption.AllDirectories)
            .Where(p => !p.Contains($"{Path.DirectorySeparatorChar}obj{Path.DirectorySeparatorChar}", StringComparison.Ordinal)
                     && !p.Contains($"{Path.DirectorySeparatorChar}bin{Path.DirectorySeparatorChar}", StringComparison.Ordinal)
                     && !p.Contains("ytLive.Tests", StringComparison.Ordinal))
            .Where(p => Path.GetFileName(p).Contains("Dialog", StringComparison.OrdinalIgnoreCase)
                     || Path.GetFileName(p).StartsWith("GoLiveWindow", StringComparison.OrdinalIgnoreCase));
    }
}