using System.Reflection;
using Xunit;

namespace Theriapolis.Tests.Architecture;

/// <summary>
/// Hard rule #1: Theriapolis.Core must not reference any rendering engine.
/// This test reflects over Core.dll and fails the build if any forbidden assembly
/// is referenced. Both MonoGame/XNA (legacy) and Godot (M1+ port) are banned —
/// keep both bans for the duration of the port so the in-flight branch can't
/// regress either way.
/// </summary>
public sealed class CoreNoDependencyTests
{
    private static readonly string[] ForbiddenPrefixes =
    {
        "Microsoft.Xna",
        "MonoGame",
        "Godot",
        "GodotSharp",
    };

    [Fact]
    public void Core_DoesNotReference_RenderingEngines()
    {
        var coreAssembly = typeof(Theriapolis.Core.C).Assembly;
        var referenced = coreAssembly.GetReferencedAssemblies();

        var violations = referenced
            .Where(r => ForbiddenPrefixes.Any(p => r.Name?.StartsWith(p, StringComparison.OrdinalIgnoreCase) == true))
            .Select(r => r.Name!)
            .ToList();

        Assert.True(violations.Count == 0,
            $"Theriapolis.Core must not reference any rendering engine (MonoGame/XNA/Godot). " +
            $"Violations: {string.Join(", ", violations)}");
    }

    /// <summary>
    /// Phase 4 also requires the new Core namespaces (Tactical, Entities,
    /// Persistence, Time) to be MonoGame-free. The reflection check above
    /// already proves this at the assembly level — this test is a belt-and-
    /// braces audit that the namespaces actually exist (i.e., we didn't
    /// accidentally put them in Game).
    /// </summary>
    [Theory]
    [InlineData("Theriapolis.Core.Tactical")]
    [InlineData("Theriapolis.Core.Entities")]
    [InlineData("Theriapolis.Core.Persistence")]
    [InlineData("Theriapolis.Core.Time")]
    public void CoreNamespace_ExistsAndIsMonoGameFree(string ns)
    {
        var asm = typeof(Theriapolis.Core.C).Assembly;
        var anyType = asm.GetTypes().FirstOrDefault(t => t.Namespace == ns);
        Assert.NotNull(anyType);
    }
}