#include "Rendering/D3D12/D3D12WindowSwapChainPresenter.h"

#include <sstream>

namespace XCEngine::UI::Editor::Host {

bool D3D12WindowSwapChainPresenter::PreparePresentSurface(
    const ::XCEngine::Rendering::RenderContext& renderContext) {
    if (!renderContext.IsValid() || renderContext.commandList == nullptr) {
        m_lastError = "PreparePresentSurface requires a valid render context.";
        return false;
    }

    if (m_swapChain == nullptr) {
        m_lastError = "PreparePresentSurface requires an initialized swap chain.";
        return false;
    }

    const std::uint32_t backBufferIndex = m_swapChain->GetCurrentBackBufferIndex();
    if (backBufferIndex >= m_backBufferViews.size() ||
        m_backBufferViews[backBufferIndex] == nullptr) {
        std::ostringstream error = {};
        error << "PreparePresentSurface could not find the current swap chain RTV. index="
              << backBufferIndex
              << " rtvCount="
              << m_backBufferViews.size();
        m_lastError = error.str();
        return false;
    }

    renderContext.commandList->TransitionBarrier(
        m_backBufferViews[backBufferIndex],
        ::XCEngine::RHI::ResourceStates::Present,
        ::XCEngine::RHI::ResourceStates::RenderTarget);
    m_lastError.clear();
    return true;
}

bool D3D12WindowSwapChainPresenter::PresentFrame() {
    if (m_swapChain == nullptr) {
        m_lastError = "PresentFrame requires an initialized swap chain.";
        return false;
    }

    m_swapChain->Present(0, 0);
    m_lastError.clear();
    return true;
}

} // namespace XCEngine::UI::Editor::Host