#include <openvr_driver.h>
#include <vector>
#include <thread>
#include <chrono>
#include <cstring>
#include <cstdlib>

#include "lighthouse_driver_wrapper.h"
#include "imu_data_provider.h"
#include "sauna_device_driver.h"

#if defined(_WIN32)
#define HMD_DLL_EXPORT extern "C" __declspec(dllexport)
#define HMD_DLL_IMPORT extern "C" __declspec(dllimport)
#elif defined(__GNUC__) || defined(COMPILER_GCC) || defined(__APPLE__)
#define HMD_DLL_EXPORT extern "C" __attribute__((visibility("default")))
#define HMD_DLL_IMPORT extern "C")
#else
#error "Unsupported Platform."
#endif

using namespace vr;
using namespace sauna;

/**
 * @brief Main driver provider class
 * 
 * This class is the main entry point for our custom driver.
 * It wraps the lighthouse driver and adds our custom functionality.
 */
class SaunaDeviceProvider : public IServerTrackedDeviceProvider
{
public:
    SaunaDeviceProvider()
        : m_bInitialized(false)
    {
    }

    virtual ~SaunaDeviceProvider()
    {
        Cleanup();
    }

    virtual EVRInitError Init(IVRDriverContext *pDriverContext) override
    {
        VR_INIT_SERVER_DRIVER_CONTEXT(pDriverContext);
        
        VRDriverLog()->Log("Initializing Sauna Driver");
        
        m_pLighthouseDriver = std::make_unique<LighthouseDriverWrapper>();
        if (!m_pLighthouseDriver->Initialize())
        {
            VRDriverLog()->Log("Failed to initialize lighthouse driver");
            return VRInitError_Driver_Failed;
        }
        
        m_pIMUDataProvider = std::make_unique<IMUDataProvider>();
        if (!m_pIMUDataProvider->Initialize())
        {
            VRDriverLog()->Log("Failed to initialize IMU data provider");
            return VRInitError_Driver_Failed;
        }
        
        // Get the lighthouse driver provider
        IServerTrackedDeviceProvider* pLighthouseProvider = m_pLighthouseDriver->GetDriverProvider();
        if (!pLighthouseProvider)
        {
            VRDriverLog()->Log("Failed to get lighthouse driver provider");
            return VRInitError_Driver_Failed;
        }
        
        // Initialize our device wrappers
        // We'll create these on demand when devices are added
        
        m_bInitialized = true;
        VRDriverLog()->Log("Sauna Driver initialized successfully");
        
        return VRInitError_None;
    }

    virtual void Cleanup() override
    {
        VRDriverLog()->Log("Cleaning up Sauna Driver");
        
        if (m_pIMUDataProvider)
        {
            m_pIMUDataProvider->Shutdown();
            m_pIMUDataProvider.reset();
        }
        
        if (m_pLighthouseDriver)
        {
            m_pLighthouseDriver->Shutdown();
            m_pLighthouseDriver.reset();
        }
        
        m_bInitialized = false;
        
        VR_CLEANUP_SERVER_DRIVER_CONTEXT();
    }

    virtual const char * const *GetInterfaceVersions() override
    {
        return vr::k_InterfaceVersions;
    }

    virtual void RunFrame() override
    {
        if (!m_bInitialized)
            return;
        
        // Forward the call to the lighthouse driver
        if (m_pLighthouseDriver)
        {
            m_pLighthouseDriver->RunFrame();
        }
        
        // Process any pending IMU data
        // In a real implementation, we would collect IMU data here
        // from the devices and update the IMU data provider
    }

    virtual bool ShouldBlockStandbyMode() override
    {
        // Forward the call to the lighthouse driver
        if (m_pLighthouseDriver && m_pLighthouseDriver->GetDriverProvider())
        {
            return m_pLighthouseDriver->GetDriverProvider()->ShouldBlockStandbyMode();
        }
        
        return false;
    }

    virtual void EnterStandby() override
    {
        // Forward the call to the lighthouse driver
        if (m_pLighthouseDriver)
        {
            m_pLighthouseDriver->EnterStandby();
        }
    }

    virtual void LeaveStandby() override
    {
        // Forward the call to the lighthouse driver
        if (m_pLighthouseDriver)
        {
            m_pLighthouseDriver->LeaveStandby();
        }
    }

private:
    bool m_bInitialized;
    std::unique_ptr<LighthouseDriverWrapper> m_pLighthouseDriver;
    std::unique_ptr<IMUDataProvider> m_pIMUDataProvider;
    std::vector<std::unique_ptr<SaunaDeviceDriver>> m_vDeviceDrivers;
};

// Driver factory method
HMD_DLL_EXPORT void *HmdDriverFactory(const char *pInterfaceName, int *pReturnCode)
{
    if (0 == strcmp(IServerTrackedDeviceProvider_Version, pInterfaceName))
    {
        return new SaunaDeviceProvider();
    }
    
    if (pReturnCode)
        *pReturnCode = VRInitError_Init_InterfaceNotFound;
    
    return nullptr;
}