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

namespace ytLive.Tests;

/// <summary>The DESIGN.md type standard names Inter and JetBrains Mono, and the creator ruled
/// (2026-10-30) that they ship with the app rather than depending on what the machine happens to
/// have installed. That makes them third-party assets with obligations, so this guard covers the
/// whole chain: the files are present and unmodified, the project ships them as resources, the
/// theme resolves them from the pack folder, and the OFL notice + license text travel with them.
///
/// <para>A missing font would otherwise fail silently — WPF falls back to a system face and the
/// design standard quietly stops being true.</para></summary>
public class BundledFontsTests
{
    private static readonly string[] Files =
    {
        "Inter-Regular.ttf", "Inter-Medium.ttf", "Inter-SemiBold.ttf", "Inter-Bold.ttf",
        "JetBrainsMono-Medium.ttf", "JetBrainsMono-SemiBold.ttf",
    };

    [Fact]
    public void The_standard_typefaces_ship_bundled_with_their_OFL_notice()
    {
        // 1. The files are there and are real font binaries, not placeholders.
        foreach (var name in Files)
        {
            var path = SourceAssert.RepoPath("Assets", "Fonts", name);
            Assert.True(new FileInfo(path).Length > 50_000, $"{name} looks like a placeholder");
        }

        // 2. The project packages each one as a WPF resource (an explicit item, not a guess).
        var csproj = SourceAssert.Text("ytLive.csproj");
        foreach (var name in Files)
            Assert.Contains($@"Assets\Fonts\{name}", csproj);

        // 3. The theme resolves each family from the pack folder — a bare family name would
        //    only work if the user happened to have the font installed.
        var tokens = SourceAssert.Text("Themes", "Tokens.xaml");
        Assert.Contains("/Assets/Fonts/#Inter", tokens);
        Assert.Contains("/Assets/Fonts/#JetBrains Mono", tokens);

        // 4. The OFL obligations: notice in THIRD-PARTY-NOTICES.txt, license text beside the files.
        var notices = SourceAssert.Text("THIRD-PARTY-NOTICES.txt");
        Assert.Contains("Inter", notices);
        Assert.Contains("JetBrains Mono", notices);
        Assert.Contains("SIL Open Font License 1.1", notices);

        foreach (var ofl in new[] { "OFL-Inter.txt", "OFL-JetBrainsMono.txt" })
        {
            var text = SourceAssert.Text("Assets", "Fonts", ofl);
            Assert.Contains("SIL OPEN FONT LICENSE", text);
        }

        // 5. No other font family sneaks in through the token sheet.
        var families = SourceAssert.Text("Themes", "Tokens.xaml")
            .Split('\n')
            .Where(l => l.Contains("FontFamily x:Key=", System.StringComparison.Ordinal))
            .ToList();
        Assert.Equal(2, families.Count);
    }
}