using System;
using UnityEngine;
using UnityEngine.Profiling;
using UnityEngine.Rendering;

namespace FidelityFX.FrameGen
{
    internal abstract class FrameInterpolationPass: IDisposable
    {
        protected readonly FrameInterpolation.ContextDescription ContextDescription;
        protected readonly FrameInterpolationResources Resources;
        protected readonly ComputeBuffer Constants;
        
        protected ComputeShader ComputeShader;
        protected int KernelIndex;
        
        private CustomSampler _sampler;
        
        protected FrameInterpolationPass(FrameInterpolation.ContextDescription contextDescription, FrameInterpolationResources resources, ComputeBuffer constants)
        {
            ContextDescription = contextDescription;
            Resources = resources;
            Constants = constants;
        }

        public virtual void Dispose()
        {
        }
        
        public void ScheduleDispatch(CommandBuffer commandBuffer, FrameInterpolation.DispatchDescription dispatchParams, int frameIndex, int dispatchX, int dispatchY, int dispatchZ = 1)
        {
            commandBuffer.BeginSample(_sampler);
            DoScheduleDispatch(commandBuffer, dispatchParams, frameIndex, dispatchX, dispatchY, dispatchZ);
            commandBuffer.EndSample(_sampler);
        }

        protected abstract void DoScheduleDispatch(CommandBuffer commandBuffer, FrameInterpolation.DispatchDescription dispatchParams, int frameIndex, int dispatchX, int dispatchY, int dispatchZ);

        protected void InitComputeShader(string passName, ComputeShader shader)
        {
            InitComputeShader(passName, shader, ContextDescription.flags);
        }
        
        private void InitComputeShader(string passName, ComputeShader shader, FrameInterpolation.InitializationFlags flags)
        {
            if (shader == null)
            {
                throw new MissingReferenceException($"Shader for Frame Interpolation pass '{passName}' could not be loaded! Please ensure it is included in the project correctly.");
            }

            ComputeShader = shader;
            KernelIndex = ComputeShader.FindKernel("CS");
            _sampler = CustomSampler.Create(passName);
            
            if ((flags & FrameInterpolation.InitializationFlags.EnableDisplayResolutionMotionVectors) == 0) ComputeShader.EnableKeyword("FFX_FRAMEINTERPOLATION_OPTION_LOW_RES_MOTION_VECTORS");
            if ((flags & FrameInterpolation.InitializationFlags.EnableJitterMotionVectors) != 0) ComputeShader.EnableKeyword("FFX_FRAMEINTERPOLATION_OPTION_JITTERED_MOTION_VECTORS");
            if ((flags & FrameInterpolation.InitializationFlags.EnableDepthInverted) != 0) ComputeShader.EnableKeyword("FFX_FRAMEINTERPOLATION_OPTION_INVERTED_DEPTH");
        }
    }

    internal class FrameInterpolationReconstructAndDilatePass : FrameInterpolationPass
    {
        public FrameInterpolationReconstructAndDilatePass(FrameInterpolation.ContextDescription contextDescription, FrameInterpolationResources resources, ComputeBuffer constants) 
            : base(contextDescription, resources, constants)
        {
            InitComputeShader("Reconstruct and Dilate", contextDescription.shaders.reconstructAndDilate);
        }

        protected override void DoScheduleDispatch(CommandBuffer commandBuffer, FrameInterpolation.DispatchDescription dispatchParams, int frameIndex, int dispatchX, int dispatchY, int dispatchZ)
        {
            throw new NotImplementedException();
        }
    }
    
    internal class FrameInterpolationSetupPass : FrameInterpolationPass
    {
        public FrameInterpolationSetupPass(FrameInterpolation.ContextDescription contextDescription, FrameInterpolationResources resources, ComputeBuffer constants) 
            : base(contextDescription, resources, constants)
        {
            InitComputeShader("Setup", contextDescription.shaders.setup);
        }

        protected override void DoScheduleDispatch(CommandBuffer commandBuffer, FrameInterpolation.DispatchDescription dispatchParams, int frameIndex, int dispatchX, int dispatchY, int dispatchZ)
        {
            throw new NotImplementedException();
        }
    }
    
    internal class FrameInterpolationReconstructPreviousDepthPass : FrameInterpolationPass
    {
        public FrameInterpolationReconstructPreviousDepthPass(FrameInterpolation.ContextDescription contextDescription, FrameInterpolationResources resources, ComputeBuffer constants) 
            : base(contextDescription, resources, constants)
        {
            InitComputeShader("Reconstruct Previous Depth", contextDescription.shaders.reconstructPreviousDepth);
        }

        protected override void DoScheduleDispatch(CommandBuffer commandBuffer, FrameInterpolation.DispatchDescription dispatchParams, int frameIndex, int dispatchX, int dispatchY, int dispatchZ)
        {
            throw new NotImplementedException();
        }
    }
    
    internal class FrameInterpolationGameMotionVectorFieldPass : FrameInterpolationPass
    {
        public FrameInterpolationGameMotionVectorFieldPass(FrameInterpolation.ContextDescription contextDescription, FrameInterpolationResources resources, ComputeBuffer constants) 
            : base(contextDescription, resources, constants)
        {
            InitComputeShader("Game Motion Vector Field", contextDescription.shaders.gameMotionVectorField);
        }

        protected override void DoScheduleDispatch(CommandBuffer commandBuffer, FrameInterpolation.DispatchDescription dispatchParams, int frameIndex, int dispatchX, int dispatchY, int dispatchZ)
        {
            throw new NotImplementedException();
        }
    }
    
    internal class FrameInterpolationOpticalFlowVectorFieldPass : FrameInterpolationPass
    {
        public FrameInterpolationOpticalFlowVectorFieldPass(FrameInterpolation.ContextDescription contextDescription, FrameInterpolationResources resources, ComputeBuffer constants) 
            : base(contextDescription, resources, constants)
        {
            InitComputeShader("Optical Flow Vector Field", contextDescription.shaders.opticalFlowVectorField);
        }

        protected override void DoScheduleDispatch(CommandBuffer commandBuffer, FrameInterpolation.DispatchDescription dispatchParams, int frameIndex, int dispatchX, int dispatchY, int dispatchZ)
        {
            throw new NotImplementedException();
        }
    }
    
    internal class FrameInterpolationDisocclusionMaskPass : FrameInterpolationPass
    {
        public FrameInterpolationDisocclusionMaskPass(FrameInterpolation.ContextDescription contextDescription, FrameInterpolationResources resources, ComputeBuffer constants) 
            : base(contextDescription, resources, constants)
        {
            InitComputeShader("Disocclusion Mask", contextDescription.shaders.disocclusionMask);
        }

        protected override void DoScheduleDispatch(CommandBuffer commandBuffer, FrameInterpolation.DispatchDescription dispatchParams, int frameIndex, int dispatchX, int dispatchY, int dispatchZ)
        {
            throw new NotImplementedException();
        }
    }
    
    internal class FrameInterpolationInterpolationPass : FrameInterpolationPass
    {
        public FrameInterpolationInterpolationPass(FrameInterpolation.ContextDescription contextDescription, FrameInterpolationResources resources, ComputeBuffer constants) 
            : base(contextDescription, resources, constants)
        {
            InitComputeShader("Interpolation", contextDescription.shaders.interpolation);
        }

        protected override void DoScheduleDispatch(CommandBuffer commandBuffer, FrameInterpolation.DispatchDescription dispatchParams, int frameIndex, int dispatchX, int dispatchY, int dispatchZ)
        {
            throw new NotImplementedException();
        }
    }
    
    internal class FrameInterpolationInpaintingPyramidPass : FrameInterpolationPass
    {
        public FrameInterpolationInpaintingPyramidPass(FrameInterpolation.ContextDescription contextDescription, FrameInterpolationResources resources, ComputeBuffer constants) 
            : base(contextDescription, resources, constants)
        {
            InitComputeShader("Inpainting Pyramid", contextDescription.shaders.inpaintingPyramid);
        }

        protected override void DoScheduleDispatch(CommandBuffer commandBuffer, FrameInterpolation.DispatchDescription dispatchParams, int frameIndex, int dispatchX, int dispatchY, int dispatchZ)
        {
            throw new NotImplementedException();
        }
    }
    
    internal class FrameInterpolationInpaintingPass : FrameInterpolationPass
    {
        public FrameInterpolationInpaintingPass(FrameInterpolation.ContextDescription contextDescription, FrameInterpolationResources resources, ComputeBuffer constants) 
            : base(contextDescription, resources, constants)
        {
            InitComputeShader("Inpainting", contextDescription.shaders.inpainting);
        }

        protected override void DoScheduleDispatch(CommandBuffer commandBuffer, FrameInterpolation.DispatchDescription dispatchParams, int frameIndex, int dispatchX, int dispatchY, int dispatchZ)
        {
            throw new NotImplementedException();
        }
    }
    
    internal class FrameInterpolationGameVectorFieldInpaintingPyramidPass : FrameInterpolationPass
    {
        public FrameInterpolationGameVectorFieldInpaintingPyramidPass(FrameInterpolation.ContextDescription contextDescription, FrameInterpolationResources resources, ComputeBuffer constants) 
            : base(contextDescription, resources, constants)
        {
            InitComputeShader("Game Vector Field Inpainting Pyramid", contextDescription.shaders.gameVectorFieldInpaintingPyramid);
        }

        protected override void DoScheduleDispatch(CommandBuffer commandBuffer, FrameInterpolation.DispatchDescription dispatchParams, int frameIndex, int dispatchX, int dispatchY, int dispatchZ)
        {
            throw new NotImplementedException();
        }
    }
    
    internal class FrameInterpolationDebugViewPass : FrameInterpolationPass
    {
        public FrameInterpolationDebugViewPass(FrameInterpolation.ContextDescription contextDescription, FrameInterpolationResources resources, ComputeBuffer constants) 
            : base(contextDescription, resources, constants)
        {
            InitComputeShader("Debug View", contextDescription.shaders.debugView);
        }

        protected override void DoScheduleDispatch(CommandBuffer commandBuffer, FrameInterpolation.DispatchDescription dispatchParams, int frameIndex, int dispatchX, int dispatchY, int dispatchZ)
        {
            throw new NotImplementedException();
        }
    }
}