using System.Numerics;
using System.Runtime.InteropServices;
using System.Security.Cryptography;
using System.Text.Json;
using Vortice.D3DCompiler;
using Vortice.Direct3D;
using Vortice.Direct3D11;
using Vortice.DXGI;
using XFEEDToolBox.Core.Rendering;
using static Vortice.Direct3D11.D3D11;

var output=Path.GetFullPath("artifacts/galaxy-manual-exposure-probe");Directory.CreateDirectory(output);
void Require(bool condition,string message){if(!condition)throw new InvalidOperationException(message);}
D3D11CreateDevice(IntPtr.Zero,DriverType.Warp,DeviceCreationFlags.None,[FeatureLevel.Level_11_0],out var device,out _,out var context).CheckError();
using var d=device;using var c=context;
using var target=device.CreateTexture2D(new Texture2DDescription{Width=6,Height=1,Format=Format.R32G32B32A32_Float,ArraySize=1,MipLevels=1,
    SampleDescription=new(1,0),Usage=ResourceUsage.Default,BindFlags=BindFlags.UnorderedAccess});
using var uav=device.CreateUnorderedAccessView(target);
using var staging=device.CreateTexture2D(new Texture2DDescription{Width=6,Height=1,Format=Format.R32G32B32A32_Float,ArraySize=1,MipLevels=1,
    SampleDescription=new(1,0),Usage=ResourceUsage.Staging,CPUAccessFlags=CpuAccessFlags.Read});
var sourcePath="artifacts/galaxy-query-research/power-outer-sources/background/hdr-programs/auto-exposure/cs_AnalyseLuminance_ManualExposure_Win64_SM50.dxbc";
var shaderPath="XFEEDToolBox/Assets/GalaxyExposure.hlsl";var sourceCode=File.ReadAllBytes(sourcePath);
using var source=device.CreateComputeShader(sourceCode);
using var translated=device.CreateComputeShader(Compiler.CompileFromFile(shaderPath,"CSOriginalManualExposure","cs_5_0").Span);
using var constants=device.CreateBuffer(128,BindFlags.ConstantBuffer);
float[] Draw(bool original,GalaxyOriginalManualExposureInputs input)
{
    var values=GalaxyOriginalExposure.ManualConstants(input);unsafe{fixed(Vector4* p=values)context.UpdateSubresource(constants,0,null,(nint)p,0,0);}
    context.ClearUnorderedAccessView(uav,Vector4.Zero);context.CSSetShader(original?source:translated);
    context.CSSetConstantBuffer(0,constants);context.CSSetUnorderedAccessView(0,uav);context.Dispatch(1,1,1);
    context.CSSetUnorderedAccessView(0,null!);context.CopyResource(staging,target);
    var mapped=context.Map(staging,0,MapMode.Read);var pixels=new float[24];Marshal.Copy(mapped.DataPointer,pixels,0,24);context.Unmap(staging,0);return pixels;
}
// Deliberate named-control fixtures, not asserted runtime/game defaults.
GalaxyOriginalManualExposureInputs[] inputs=[GalaxyOriginalExposure.InitialManualControls,new(0,1,2,0,1),new(-2,1,2,0,1),new(2,1,2,0,1),new(0,1.2f,2,0,1),new(.5f,1,1.5f,.25f,1.1f)];
var rows=new List<object>();float maxGpu=0,maxCpu=0;
foreach(var input in inputs)
{
    Require(GalaxyOriginalExposure.TryManualExposure(input,out var cpu),"Valid explicit exposure controls rejected");
    var actual=Draw(true,input);var port=Draw(false,input);
    Require(actual.All(float.IsFinite)&&port.All(float.IsFinite),"Nonfinite manual exposure output");
    var error=actual.Zip(port,(a,b)=>Math.Abs(a-b)).Max();maxGpu=Math.Max(maxGpu,error);
    var cpuError=Math.Max(Math.Abs(actual[0]-cpu.LinearAdaptation),Math.Abs(actual[4]-cpu.CompensatedLuminance));maxCpu=Math.Max(maxCpu,cpuError);
    Require(error<.00001f&&cpuError<.00002f,"Original ManualExposure CS comparison failed");
    Require(actual.Skip(8).All(v=>v==0),"Manual shader fabricated histogram samples2..5");
    rows.Add(new{input,originalInitialControls=input==GalaxyOriginalExposure.InitialManualControls,actualAdaptation=actual[0],actualCompensatedLuminance=actual[4],type2Emissive=actual[4]*.125f,gpuError=error,cpuError});
}
Require(!GalaxyOriginalExposure.TryManualExposure(new(0,0,0,0,0),out _),"Invalid curve was clamped into usable exposure");
Require(GalaxyOriginalExposure.DefaultHistogram.Type2EmissiveRescaling==0,"Original zero fallback became unity");
var report=new{passed=true,gameAccess=false,originalComputeShaderGpuCompared=true,originalInitialControlsGpuCompared=true,additionalExplicitSyntheticControls=true,runtimeControlsNotClaimed=true,
    maximumGpuError=maxGpu,maximumCpuError=maxCpu,rows,originalSha256=Convert.ToHexStringLower(SHA256.HashData(sourceCode)),
    productionHlslSha256=Convert.ToHexStringLower(SHA256.HashData(File.ReadAllBytes(shaderPath)))};
File.WriteAllText(Path.Combine(output,"result.json"),JsonSerializer.Serialize(report,new JsonSerializerOptions{WriteIndented=true}));Console.WriteLine(JsonSerializer.Serialize(report));