#include "LightEnvironment.h"
#include "Graphics/Graphics.h"

using namespace Seele;

LightEnvironment::LightEnvironment(Gfx::PGraphics graphics) : graphics(graphics) {
    layout = graphics->createDescriptorLayout("pLightEnv");
    layout->addDescriptorBinding(Gfx::DescriptorBinding{
        .name = "directionalLights",
        .descriptorType = Gfx::SE_DESCRIPTOR_TYPE_STORAGE_BUFFER,
    });
    layout->addDescriptorBinding(Gfx::DescriptorBinding{
        .name = "numDirectionalLights",
        .uniformLength = sizeof(uint)
    });
    layout->addDescriptorBinding(Gfx::DescriptorBinding{
        .name = "pointLights",
        .descriptorType = Gfx::SE_DESCRIPTOR_TYPE_STORAGE_BUFFER,
    });
    layout->addDescriptorBinding(Gfx::DescriptorBinding{
        .name = "numPointLights",
        .uniformLength = sizeof(uint)
    });
    layout->create();

    directionalLights = graphics->createShaderBuffer(ShaderBufferCreateInfo{
        .name = "DirectionalLights",
    });
    pointLights = graphics->createShaderBuffer(ShaderBufferCreateInfo{
        .name = "PointLights",
    });
}

LightEnvironment::~LightEnvironment() {}

void LightEnvironment::reset() {
    layout->reset();
    set = layout->allocateDescriptorSet();
    dirs.clear();
    points.clear();
}

void LightEnvironment::addDirectionalLight(Component::DirectionalLight dirLight) { dirs.add(dirLight); }

void LightEnvironment::addPointLight(Component::PointLight pointLight) { points.add(pointLight); }

void LightEnvironment::commit() {
    directionalLights->rotateBuffer(sizeof(Component::DirectionalLight) * dirs.size());
    directionalLights->updateContents(0, sizeof(Component::DirectionalLight) * dirs.size(), dirs.data());
    directionalLights->pipelineBarrier(Gfx::SE_ACCESS_TRANSFER_WRITE_BIT, Gfx::SE_PIPELINE_STAGE_TRANSFER_BIT,
                                       Gfx::SE_ACCESS_SHADER_READ_BIT | Gfx::SE_ACCESS_TRANSFER_WRITE_BIT,
                                       Gfx::SE_PIPELINE_STAGE_FRAGMENT_SHADER_BIT | Gfx::SE_PIPELINE_STAGE_COMPUTE_SHADER_BIT |
                                           Gfx::SE_PIPELINE_STAGE_TRANSFER_BIT);
    pointLights->rotateBuffer(sizeof(Component::PointLight) * points.size());
    pointLights->updateContents(0, sizeof(Component::PointLight) * points.size(), points.data());
    pointLights->pipelineBarrier(Gfx::SE_ACCESS_TRANSFER_WRITE_BIT, Gfx::SE_PIPELINE_STAGE_TRANSFER_BIT,
                                 Gfx::SE_ACCESS_SHADER_READ_BIT | Gfx::SE_ACCESS_TRANSFER_WRITE_BIT,
                                 Gfx::SE_PIPELINE_STAGE_FRAGMENT_SHADER_BIT | Gfx::SE_PIPELINE_STAGE_COMPUTE_SHADER_BIT |
                                     Gfx::SE_PIPELINE_STAGE_TRANSFER_BIT);
    uint32 numPointLights = points.size();
    uint32 numDirectionalLights = dirs.size();
    set->updateConstants("numPointLights", 0, &numPointLights);
    set->updateBuffer("pointLights", 0, pointLights);
    set->updateConstants("numDirectionalLights", 0, &numDirectionalLights);
    set->updateBuffer("directionalLights", 0, directionalLights);
    set->writeChanges();
}

const Gfx::PDescriptorLayout LightEnvironment::getDescriptorLayout() const { return layout; }

Gfx::PDescriptorSet LightEnvironment::getDescriptorSet() { return set; }