// Passthrough effect implementation

#include "effects/passthrough_effect.h"
#include "effects/shaders.h"
#include "gpu/post_process_helper.h"
#include "util/fatal_error.h"

Passthrough::Passthrough(const GpuContext& ctx,
                         const std::vector<std::string>& inputs,
                         const std::vector<std::string>& outputs,
                         float start_time, float end_time)
    : Effect(ctx, inputs, outputs, start_time, end_time) {
  HEADLESS_RETURN_IF_NULL(ctx_.device);

  init_uniforms_buffer();
  create_linear_sampler();

  pipeline_.set(create_post_process_pipeline_simple(
      ctx_.device, WGPUTextureFormat_RGBA8Unorm, passthrough_shader_wgsl));
}

void Passthrough::render(WGPUCommandEncoder encoder,
                         const UniformsSequenceParams& params,
                         NodeRegistry& nodes) {
  // Get input/output views
  WGPUTextureView input_view = nodes.get_view(input_nodes_[0]);
  WGPUTextureView output_view = nodes.get_view(output_nodes_[0]);

  // Update uniforms
  uniforms_buffer_.update(ctx_.queue, params);

  // Manually create bind group with only 3 entries (no effect params needed)
  WGPUBindGroupEntry entries[3] = {};
  entries[0].binding = PP_BINDING_SAMPLER;
  entries[0].sampler = sampler_.get();
  entries[1].binding = PP_BINDING_TEXTURE;
  entries[1].textureView = input_view;
  entries[2].binding = PP_BINDING_UNIFORMS;
  entries[2].buffer = uniforms_buffer_.get().buffer;
  entries[2].size = sizeof(UniformsSequenceParams);

  WGPUBindGroupDescriptor bg_desc = {};
  bg_desc.layout = wgpuRenderPipelineGetBindGroupLayout(pipeline_.get(), 0);
  bg_desc.entryCount = 3;
  bg_desc.entries = entries;

  bind_group_.replace(wgpuDeviceCreateBindGroup(ctx_.device, &bg_desc));

  // Render pass
  WGPURenderPassColorAttachment color_attachment = {};
  gpu_init_color_attachment(color_attachment, output_view);

  WGPURenderPassDescriptor pass_desc = {};
  pass_desc.colorAttachmentCount = 1;
  pass_desc.colorAttachments = &color_attachment;

  WGPURenderPassEncoder pass =
      wgpuCommandEncoderBeginRenderPass(encoder, &pass_desc);
  wgpuRenderPassEncoderSetPipeline(pass, pipeline_.get());
  wgpuRenderPassEncoderSetBindGroup(pass, 0, bind_group_.get(), 0, nullptr);
  wgpuRenderPassEncoderDraw(pass, 3, 1, 0, 0); // Fullscreen triangle
  wgpuRenderPassEncoderEnd(pass);
  wgpuRenderPassEncoderRelease(pass);
}