#if GE_GRAPHICS_DX11

#if !BF_PLATFORM_WINDOWS
#error DirectX 11 (GE_GRAPHICS_DX11) can only be used on Windows.
#endif

using DirectX.Common;
using DirectX.D3D11;
using DirectX.D3D11.SDKLayers;
using System.Diagnostics;
using System.Threading;

namespace GlitchyEngine.Platform.DX11
{
	static
	{
		/// Gets whether or not the DX11 device is initialized.
		protected internal static bool IsDx11Initialized => NativeDevice != null;
		protected internal static ID3D11Device* NativeDevice;
		protected internal static ID3D11DeviceContext* NativeContext;

		protected internal static Monitor ContextMonitor = new Monitor() ~ delete _;

#if DEBUG	
		protected internal static ID3D11Debug* DebugDevice;
#endif

		internal static void Dx11Init()
		{
			Debug.Profiler.ProfileFunction!();

			if(!IsDx11Initialized)
			{
				Log.EngineLogger.Trace("Creating D3D11 Device and Context...");
				
				DeviceCreationFlags deviceFlags = .None;
#if DEBUG
				deviceFlags |= .Debug;
#endif
	
				FeatureLevel[] levels = scope .(.Level_11_0);

				FeatureLevel deviceLevel = ?;

				HResult deviceResult;
				{
					Debug.Profiler.ProfileScope!("D3D11.CreateDevice");
					using (ContextMonitor.Enter())
					{
						deviceResult = D3D11.CreateDevice(null, .Hardware, 0, deviceFlags, levels, &NativeDevice, &deviceLevel, &NativeContext);
					}
				}
				
				Log.EngineLogger.Assert(deviceResult.Succeeded, scope $"Failed to create D3D11 Device. Message({(int32)deviceResult}): {deviceResult}");
	
#if DEBUG
				{
					Debug.Profiler.ProfileScope!("Query for ID3D11Debug");
					if(NativeDevice.QueryInterface<ID3D11Debug>(out DebugDevice).Succeeded)
					{
						ID3D11InfoQueue* infoQueue;
						if(NativeDevice.QueryInterface<ID3D11InfoQueue>(out infoQueue).Succeeded)
						{
							infoQueue.SetBreakOnSeverity(.Corruption, true);
							infoQueue.SetBreakOnSeverity(.Error, true);
		
							infoQueue.Release();
						}
					}
				}
#endif
	
				Log.EngineLogger.Trace($"D3D11 Device and Context created (Feature level: {deviceLevel})");
			}
			else
			{
				// We created a second GraphicsContext (for some reason?) just increment references.
				NativeDevice.AddRef();
				NativeContext.AddRef();
#if DEBUG
				DebugDevice.AddRef();
#endif
			}
		}

		internal static void Dx11Release()
		{
			Debug.Profiler.ProfileFunction!();

			NativeDevice.Release();
			NativeContext.Release();
#if DEBUG
			Debug.WriteLine("""

				-------------------------
				 Live DX Objects Report:

				""");

			DebugDevice.ReportLiveDeviceObjects(.Detail | .IgnoreInternal);

			Debug.WriteLine("""

				-------------------------

				""");

			DebugDevice.Release();
#endif
		}
	}
}

#endif