#include <XCEngine/Resources/Mesh/Mesh.h>
#include <cstring>

namespace XCEngine {
namespace Resources {

Mesh::Mesh() = default;
Mesh::~Mesh() = default;

void Mesh::Release() {
    m_vertexData.Clear();
    m_indexData.Clear();
    m_sections.Clear();
    m_vertexCount = 0;
    m_vertexStride = 0;
    m_attributes = VertexAttribute::Position;
    m_indexCount = 0;
    m_use32BitIndex = false;
    UpdateMemorySize();
    SetInvalid();
}

void Mesh::SetVertexData(const void* data, size_t size, Core::uint32 vertexCount,
                        Core::uint32 vertexStride, VertexAttribute attributes) {
    m_vertexCount = vertexCount;
    m_vertexStride = vertexStride;
    m_attributes = attributes;
    
    m_vertexData.Resize(size);
    if (size > 0 && data != nullptr) {
        std::memcpy(m_vertexData.Data(), data, size);
    }

    UpdateMemorySize();
}

void Mesh::SetIndexData(const void* data, size_t size, Core::uint32 indexCount, bool use32Bit) {
    m_indexCount = indexCount;
    m_use32BitIndex = use32Bit;
    
    m_indexData.Resize(size);
    if (size > 0 && data != nullptr) {
        std::memcpy(m_indexData.Data(), data, size);
    }

    UpdateMemorySize();
}

void Mesh::AddSection(const MeshSection& section) {
    m_sections.PushBack(section);
    UpdateMemorySize();
}

void Mesh::UpdateMemorySize() {
    m_memorySize = m_vertexData.Size() +
                   m_indexData.Size() +
                   m_sections.Size() * sizeof(MeshSection);
}

} // namespace Resources
} // namespace XCEngine