/*=========================================================================

   Library: iMSTK

   Copyright (c) Kitware, Inc. & Center for Modeling, Simulation,
   & Imaging in Medicine, Rensselaer Polytechnic Institute.

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

      http://www.apache.org/licenses/LICENSE-2.0.txt

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.

=========================================================================*/

#include "imstkVulkanRenderDelegate.h"

#include "g3log/g3log.hpp"

#include "imstkPlane.h"
#include "imstkSphere.h"
#include "imstkCube.h"
#include "imstkCapsule.h"
#include "imstkSurfaceMesh.h"
#include "imstkTetrahedralMesh.h"
#include "imstkDecalPool.h"
#include "imstkLineMesh.h"

#include "imstkVulkanPlaneRenderDelegate.h"
#include "imstkVulkanSphereRenderDelegate.h"
#include "imstkVulkanCubeRenderDelegate.h"
#include "imstkVulkanCapsuleRenderDelegate.h"
#include "imstkVulkanSurfaceMeshRenderDelegate.h"
#include "imstkVulkanDecalRenderDelegate.h"
#include "imstkVulkanLineMeshRenderDelegate.h"
#include "imstkVulkanParticleRenderDelegate.h"

namespace imstk
{
void
VulkanRenderDelegate::initialize(std::shared_ptr<VisualModel> visualModel)
{
    m_visualModel = visualModel;

    if (!m_visualModel->getRenderMaterial())
    {
        auto material = std::make_shared<RenderMaterial>();
        m_visualModel->setRenderMaterial(material);
    }
}

std::shared_ptr<VulkanRenderDelegate>
VulkanRenderDelegate::make_delegate(std::shared_ptr<VisualModel> visualModel,
                                    SceneObject::Type            type,
                                    VulkanMemoryManager&         memoryManager)
{
    visualModel->m_renderDelegateCreated = true;
    switch (visualModel->getGeometry()->getType())
    {
    case Geometry::Type::Plane:
    {
        return std::make_shared<VulkanPlaneRenderDelegate>(visualModel, type, memoryManager);
    }
    case Geometry::Type::Sphere:
    {
        return std::make_shared<VulkanSphereRenderDelegate>(visualModel, type, memoryManager);
    }
    case Geometry::Type::Cube:
    {
        return std::make_shared<VulkanCubeRenderDelegate>(visualModel, type, memoryManager);
    }
    case Geometry::Type::Capsule:
    {
        return std::make_shared<VulkanCapsuleRenderDelegate>(visualModel, type, memoryManager);
    }
    case Geometry::Type::SurfaceMesh:
    {
        return std::make_shared<VulkanSurfaceMeshRenderDelegate>(visualModel, type, memoryManager);
    }
    case Geometry::Type::PointSet:
    {
        LOG(FATAL) << "No support for PointSet rendering with Vulkan backend!";
    }
    case Geometry::Type::TetrahedralMesh:
    {
        /*auto tetrahedralMesh = std::dynamic_pointer_cast<TetrahedralMesh>(geom);
        return std::make_shared<VulkanTetrahedralMeshRenderDelegate>(tetrahedralMesh);*/

        LOG(FATAL) << "No support for TetrahedralMesh rendering with Vulkan backend!";
    }
    case Geometry::Type::LineMesh:
    {
        return std::make_shared<VulkanLineMeshRenderDelegate>(visualModel, type, memoryManager);
    }
    case Geometry::Type::HexahedralMesh:
    {
        /*LOG(WARNING) << "RenderDelegate::make_delegate error: HexahedralMeshRenderDelegate not yet implemented";
        return nullptr;*/

        LOG(FATAL) << "No support for HexahedralMesh rendering with Vulkan backend!";
    }
    case Geometry::Type::DecalPool:
    {
        return std::make_shared<VulkanDecalRenderDelegate>(visualModel, type, memoryManager);
    }
    case Geometry::Type::RenderParticles:
    {
        return std::make_shared<VulkanParticleRenderDelegate>(visualModel, type, memoryManager);
    }
    default:
    {
        LOG(WARNING) << "RenderDelegate::make_delegate error: Geometry type incorrect.";
        visualModel->m_renderDelegateCreated = false;
        return nullptr;
    }
    }
}

std::shared_ptr<VisualModel>
VulkanRenderDelegate::getVisualModel() const
{
    return m_visualModel;
}

std::shared_ptr<VulkanVertexBuffer>
VulkanRenderDelegate::getBuffer()
{
    return m_vertexBuffer;
}

void
VulkanRenderDelegate::initializeData(VulkanMemoryManager&            memoryManager,
                                     std::shared_ptr<RenderMaterial> material,
                                     VulkanVertexBufferMode          mode)
{
    m_vertexUniformBuffer   = std::make_shared<VulkanUniformBuffer>(memoryManager, (uint32_t)sizeof(VulkanLocalVertexUniforms));
    m_fragmentUniformBuffer = std::make_shared<VulkanUniformBuffer>(memoryManager, (uint32_t)sizeof(VulkanLocalFragmentUniforms));

    if (material->getDisplayMode() == RenderMaterial::DisplayMode::SURFACE
        || material->getDisplayMode() == RenderMaterial::DisplayMode::WIREFRAME_SURFACE)
    {
        m_material = std::make_shared<VulkanMaterialDelegate>(m_vertexUniformBuffer,
            m_fragmentUniformBuffer,
            material,
            memoryManager);
    }

    m_shadowMaterial = std::make_shared<VulkanMaterialDelegate>(m_vertexUniformBuffer,
        m_fragmentUniformBuffer,
        material,
        memoryManager,
        VulkanMaterialType::Shadow);

    m_depthMaterial = std::make_shared<VulkanMaterialDelegate>(m_vertexUniformBuffer,
        m_fragmentUniformBuffer,
        material,
        memoryManager,
        VulkanMaterialType::Depth);

    if (material->getDisplayMode() != RenderMaterial::DisplayMode::SURFACE)
    {
        m_wireframeMaterial = std::make_shared<VulkanMaterialDelegate>(m_vertexUniformBuffer,
            m_fragmentUniformBuffer,
            material,
            memoryManager,
            VulkanMaterialType::Wireframe);
    }

    m_vertexBuffer = std::make_shared<VulkanVertexBuffer>(memoryManager,
        m_numVertices,
        m_vertexSize,
        m_numTriangles,
        m_loadFactor,
        mode);
}

void
VulkanRenderDelegate::updateTransform()
{
    auto geometry = this->getVisualModel()->getGeometry();
    if (!geometry->m_transformModified)
    {
        return;
    }
    AffineTransform3d T(geometry->m_transform.matrix());
    T.scale(geometry->getScaling());
    m_localVertexUniforms.transform = glm::make_mat4(T.data());
    geometry->m_transformModified   = false;
}

void
VulkanRenderDelegate::updateUniforms(uint32_t frameIndex)
{
    auto geometry = this->getVisualModel()->getGeometry();
    this->updateTransform();
    m_vertexUniformBuffer->updateUniforms(sizeof(VulkanLocalVertexUniforms),
        (void*)&m_localVertexUniforms,
        frameIndex);

    auto mat = this->getVisualModel()->getRenderMaterial();

    auto color = mat->getColor();
    m_localFragmentUniforms.color = glm::vec4(color.r, color.g, color.b, color.a);
    m_localFragmentUniforms.receivesShadows = mat->getReceivesShadows() ? 1 : 0;
    m_localFragmentUniforms.emissivity      = mat->getEmissivity();
    m_localFragmentUniforms.roughness       = mat->getRoughness();
    m_localFragmentUniforms.metalness       = mat->getMetalness();

    auto debugColor = mat->getDebugColor();
    m_localFragmentUniforms.color      = glm::vec4(color.r, color.g, color.b, color.a);
    m_localFragmentUniforms.debugColor = glm::vec4(debugColor.r, debugColor.g, debugColor.b, debugColor.a);

    m_fragmentUniformBuffer->updateUniforms(sizeof(VulkanLocalFragmentUniforms),
        (void*)&m_localFragmentUniforms, frameIndex);
}
}