using AcDream.App.UI.Layout;
using DatReaderWriter;
using DatReaderWriter.Options;
using Xunit.Sdk;
using SysEnv = System.Environment;

namespace AcDream.App.Tests.UI.Layout;

/// <summary>
/// Campaign OP slice OP5: live-DAT proof that <see cref="ChatOptionsDatDefaults"/>
/// resolves the Chat tab's two opacity-slider defaults from the installed DAT —
/// same pattern as <c>RetailSelectionAssetTests</c> (runs against the real
/// installed <c>client_portal.dat</c>, skips gracefully when none is present, no
/// env-var gate needed since it never writes anything).
/// </summary>
public sealed class ChatOptionsDatDefaultsTests
{
    [Fact]
    public void InstalledDat_ResolvesTheByteVerifiedSliderDefaults()
    {
        string datDir = ResolveDatDir();
        using var dats = new DatCollection(datDir, DatAccessType.Read);

        bool resolved = ChatOptionsDatDefaults.TryRead(
            dats, out float defaultOpacity, out float activeOpacity);

        // Empirically confirmed against the installed DAT (this slice's own research
        // trace): DID 0x78000001, Option_DefaultOpacity_Property = 0.5,
        // Option_ActiveOpacity_Property = 1.0 — matching retail's ChatInterface base-
        // constructor fallback exactly (a coincidence the fallback documents, not
        // something this test relies on to pass).
        Assert.True(resolved);
        Assert.Equal(0.5f, defaultOpacity);
        Assert.Equal(1.0f, activeOpacity);
    }

    private static string ResolveDatDir()
    {
        string? configured = SysEnv.GetEnvironmentVariable("ACDREAM_DAT_DIR");
        if (!string.IsNullOrWhiteSpace(configured)
            && File.Exists(Path.Combine(configured, "client_portal.dat")))
            return configured;

        const string installed = @"C:\Turbine\Asheron's Call";
        if (File.Exists(Path.Combine(installed, "client_portal.dat")))
            return installed;

        string conventional = Path.Combine(
            SysEnv.GetFolderPath(SysEnv.SpecialFolder.UserProfile),
            "Documents",
            "Asheron's Call");
        if (File.Exists(Path.Combine(conventional, "client_portal.dat")))
            return conventional;

        throw SkipException.ForSkip("Installed client_portal.dat is required.");
    }
}