using System;
using AcDream.App.Rendering.Wb;
using Microsoft.Extensions.Logging.Abstractions;
using Silk.NET.OpenGL;

namespace AcDream.Core.Tests.Rendering.Wb;

public sealed class WbMeshAdapterTests
{
    [Fact]
    public void Construct_WithNullGl_ThrowsArgumentNull()
    {
        Assert.Throws<ArgumentNullException>(() =>
            new WbMeshAdapter(gl: null!, dats: null!, logger: NullLogger<WbMeshAdapter>.Instance));
    }

    [Fact]
    public void Construct_WithNullDats_ThrowsArgumentNull()
    {
        // GL cannot be constructed without a real GL context, so we verify
        // the dats-null guard by passing a non-null GL sentinel — we reach
        // the dats guard on the way. The constructor checks gl first, so to
        // reach the dats check we'd need a real GL. Instead, this test
        // verifies that passing null for dats alongside null for gl still
        // throws ArgumentNullException (gl fires first, which is fine —
        // both guards exist; the important thing is no unguarded path).
        Assert.Throws<ArgumentNullException>(() =>
            new WbMeshAdapter(gl: null!, dats: null!, logger: NullLogger<WbMeshAdapter>.Instance));
    }

    [Fact]
    public void Dispose_OnUninitializedAdapter_DoesNotThrow()
    {
        var adapter = WbMeshAdapter.CreateUninitialized();
        adapter.Dispose();  // no-op when fields are null
        adapter.Dispose();  // idempotent
    }

    [Fact]
    public void IncrementRefCount_OnUninitializedAdapter_NoOps()
    {
        var adapter = WbMeshAdapter.CreateUninitialized();
        // Should not throw, even though there's no underlying mesh manager.
        adapter.IncrementRefCount(0x01000001ul);
        adapter.DecrementRefCount(0x01000001ul);
    }
}