#ifndef MWVR_VRVIEW_H
#define MWVR_VRVIEW_H

#include <cassert>
#include "openxrmanager.hpp"
#include "openxrswapchain.hpp"

struct XrSwapchainSubImage;

namespace MWVR
{
    class VRViewer;

    /// \brief Manipulates a slave camera by replacing its framebuffer with one destined for openxr
    class VRView : public osg::Referenced
    {
    public:

        class InitialDrawCallback : public osg::Camera::DrawCallback
        {
        public:
            virtual void operator()(osg::RenderInfo& renderInfo) const;
        };

        class UpdateSlaveCallback : public osg::View::Slave::UpdateSlaveCallback
        {
        public:
            UpdateSlaveCallback(osg::ref_ptr<VRView> view) : mView(view) {}
            void updateSlave(osg::View& view, osg::View::Slave& slave) override;

        private:
            osg::ref_ptr<VRView> mView;
        };

    public:
        VRView(std::string name, SwapchainConfig config, osg::ref_ptr<osg::State> state);
        virtual ~VRView();

    public:
        //! Prepare for render (set FBO)
        virtual void prerenderCallback(osg::RenderInfo& renderInfo);

        //! Finalize render
        virtual void postrenderCallback(osg::RenderInfo& renderInfo);

        //! Create camera for this view
        osg::Camera* createCamera(int order, const osg::Vec4& clearColor, osg::GraphicsContext* gc);

        //! Get the view surface
        OpenXRSwapchain& swapchain(void) { return *mSwapchain; }

        //! Present to the openxr swapchain
        void swapBuffers(osg::GraphicsContext* gc);

        void updateSlave(osg::View& view, osg::View::Slave& slave);
    public:
        SwapchainConfig mSwapchainConfig;
        std::unique_ptr<OpenXRSwapchain> mSwapchain;
        std::string mName{};
        osg::Node::NodeMask mCullMask;
        bool mRendering{ false };
    };
}

#endif