#define _CRT_SECURE_NO_WARNINGS 1 /* STFU MSVC */
#include "IHIDDevice.hpp"
#include "boo/inputdev/DeviceToken.hpp"
#include "boo/inputdev/DeviceBase.hpp"
#include <thread>
#include <mutex>
#include <condition_variable>
#include <cstring>
#include <cstdio>
#include <algorithm>

#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN 1
#endif
#include <windows.h>
#include <winusb.h>
#include <usb100.h>
#include <Winusbio.h>
#include <hidsdi.h>

#undef min
#undef max

namespace boo {

class HIDDeviceWinUSB final : public IHIDDevice {
  DeviceToken& m_token;
  std::shared_ptr<DeviceBase> m_devImp;

  HANDLE m_devHandle = 0;
  HANDLE m_hidHandle = 0;
  WINUSB_INTERFACE_HANDLE m_usbHandle = nullptr;
  unsigned m_usbIntfInPipe = 0;
  unsigned m_usbIntfOutPipe = 0;
  bool m_runningTransferLoop = false;

  std::string_view m_devPath;
  std::mutex m_initMutex;
  std::condition_variable m_initCond;
  std::thread m_thread;

  bool _sendUSBInterruptTransfer(const uint8_t* data, size_t length) {
    if (m_usbHandle) {
      ULONG lengthTransferred = 0;
      if (!WinUsb_WritePipe(m_usbHandle, m_usbIntfOutPipe, (PUCHAR)data, (ULONG)length, &lengthTransferred, NULL) ||
          lengthTransferred != length)
        return false;
      return true;
    }
    return false;
  }

  size_t _receiveUSBInterruptTransfer(uint8_t* data, size_t length) {
    if (m_usbHandle) {
      ULONG lengthTransferred = 0;
      if (!WinUsb_ReadPipe(m_usbHandle, m_usbIntfInPipe, (PUCHAR)data, (ULONG)length, &lengthTransferred, NULL))
        return 0;
      return lengthTransferred;
    }
    return 0;
  }

  static void _threadProcUSBLL(std::shared_ptr<HIDDeviceWinUSB> device) {
    unsigned i;
    std::unique_lock<std::mutex> lk(device->m_initMutex);

    /* POSIX.. who needs it?? -MS */
    device->m_devHandle =
        CreateFileA(device->m_devPath.data(), GENERIC_WRITE | GENERIC_READ, FILE_SHARE_WRITE | FILE_SHARE_READ, NULL,
                    OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL | FILE_FLAG_OVERLAPPED, NULL);
    if (INVALID_HANDLE_VALUE == device->m_devHandle) {
      device->m_devImp->deviceError(fmt("Unable to open {}@{}: {}\n"),
        device->m_token.getProductName(), device->m_devPath, GetLastError());
      lk.unlock();
      device->m_initCond.notify_one();
      return;
    }

    if (!WinUsb_Initialize(device->m_devHandle, &device->m_usbHandle)) {
      device->m_devImp->deviceError(fmt("Unable to open {}@{}: {}\n"),
        device->m_token.getProductName(), device->m_devPath, GetLastError());
      lk.unlock();
      device->m_initCond.notify_one();
      CloseHandle(device->m_devHandle);
      return;
    }

    /* Enumerate device pipes */
    USB_INTERFACE_DESCRIPTOR ifDesc = {0};
    if (!WinUsb_QueryInterfaceSettings(device->m_usbHandle, 0, &ifDesc)) {
      device->m_devImp->deviceError(fmt("Unable to open {}@{}: {}\n"),
        device->m_token.getProductName(), device->m_devPath, GetLastError());
      lk.unlock();
      device->m_initCond.notify_one();
      CloseHandle(device->m_devHandle);
      return;
    }
    for (i = 0; i < ifDesc.bNumEndpoints; ++i) {
      WINUSB_PIPE_INFORMATION pipeDesc;
      WinUsb_QueryPipe(device->m_usbHandle, 0, i, &pipeDesc);
      if (pipeDesc.PipeType == UsbdPipeTypeInterrupt) {
        if (USB_ENDPOINT_DIRECTION_IN(pipeDesc.PipeId))
          device->m_usbIntfInPipe = pipeDesc.PipeId;
        else
          device->m_usbIntfOutPipe = pipeDesc.PipeId;
      }
    }

    /* Return control to main thread */
    device->m_runningTransferLoop = true;
    lk.unlock();
    device->m_initCond.notify_one();

    /* Start transfer loop */
    device->m_devImp->initialCycle();
    while (device->m_runningTransferLoop)
      device->m_devImp->transferCycle();
    device->m_devImp->finalCycle();

    /* Cleanup */
    WinUsb_Free(device->m_usbHandle);
    CloseHandle(device->m_devHandle);
    device->m_devHandle = 0;
  }

  static void _threadProcBTLL(std::shared_ptr<HIDDeviceWinUSB> device) {
    std::unique_lock<std::mutex> lk(device->m_initMutex);

    /* Return control to main thread */
    device->m_runningTransferLoop = true;
    lk.unlock();
    device->m_initCond.notify_one();

    /* Start transfer loop */
    device->m_devImp->initialCycle();
    while (device->m_runningTransferLoop)
      device->m_devImp->transferCycle();
    device->m_devImp->finalCycle();
  }

  size_t m_minFeatureSz = 0;
  size_t m_minInputSz = 0;
  size_t m_minOutputSz = 0;

  PHIDP_PREPARSED_DATA m_preparsedData = nullptr;

  static void _threadProcHID(std::shared_ptr<HIDDeviceWinUSB> device) {
    std::unique_lock<std::mutex> lk(device->m_initMutex);

    /* POSIX.. who needs it?? -MS */
    device->m_overlapped.hEvent = CreateEvent(nullptr, TRUE, FALSE, nullptr);
    device->m_hidHandle =
        CreateFileA(device->m_devPath.data(), GENERIC_WRITE | GENERIC_READ, FILE_SHARE_WRITE | FILE_SHARE_READ, NULL,
                    OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL | FILE_FLAG_OVERLAPPED, NULL);
    if (INVALID_HANDLE_VALUE == device->m_hidHandle) {
      device->m_devImp->deviceError(fmt("Unable to open {}@{}: {}\n"),
        device->m_token.getProductName(), device->m_devPath, GetLastError());
      lk.unlock();
      device->m_initCond.notify_one();
      return;
    }

    if (!HidD_GetPreparsedData(device->m_hidHandle, &device->m_preparsedData)) {
      device->m_devImp->deviceError(fmt("Unable get preparsed data of {}@{}: {}\n"),
        device->m_token.getProductName(), device->m_devPath, GetLastError());
      lk.unlock();
      device->m_initCond.notify_one();
      return;
    }

    HIDP_CAPS caps;
    HidP_GetCaps(device->m_preparsedData, &caps);
    device->m_minFeatureSz = caps.FeatureReportByteLength;
    device->m_minInputSz = caps.InputReportByteLength;
    device->m_minOutputSz = caps.OutputReportByteLength;

    /* Return control to main thread */
    device->m_runningTransferLoop = true;
    lk.unlock();
    device->m_initCond.notify_one();

    /* Allocate read buffer */
    size_t inBufferSz = device->m_minInputSz;
    std::unique_ptr<uint8_t[]> readBuf(new uint8_t[inBufferSz]);

    /* Start transfer loop */
    device->m_devImp->initialCycle();
    while (device->m_runningTransferLoop) {
      device->ReadCycle(readBuf.get(), inBufferSz);
      if (device->m_runningTransferLoop)
        device->m_devImp->transferCycle();
    }
    device->m_devImp->finalCycle();

    /* Cleanup */
    CloseHandle(device->m_overlapped.hEvent);
    CloseHandle(device->m_hidHandle);
    HidD_FreePreparsedData(device->m_preparsedData);
    device->m_hidHandle = nullptr;
  }

  void _deviceDisconnected() { m_runningTransferLoop = false; }

  std::vector<uint8_t> m_sendBuf;
  std::vector<uint8_t> m_recvBuf;

  const PHIDP_PREPARSED_DATA _getReportDescriptor() { return m_preparsedData; }

  bool _sendHIDReport(const uint8_t* data, size_t length, HIDReportType tp, uint32_t message) {
    size_t maxOut = std::max(m_minFeatureSz, std::max(m_minOutputSz, length));
    if (m_sendBuf.size() < maxOut)
      m_sendBuf.resize(maxOut);
    if (maxOut > length)
      memset(m_sendBuf.data() + length, 0, maxOut - length);
    memmove(m_sendBuf.data(), data, length);

    if (tp == HIDReportType::Output) {
      DWORD useLength = DWORD(std::max(length, m_minOutputSz));
      DWORD BytesWritten;
      OVERLAPPED Overlapped;
      ZeroMemory(&Overlapped, sizeof(Overlapped));
      BOOL Result = WriteFile(m_hidHandle, m_sendBuf.data(), useLength, &BytesWritten, &Overlapped);
      if (!Result) {
        DWORD Error = GetLastError();

        if (Error == ERROR_INVALID_USER_BUFFER) {
          // std::cout << "Falling back to SetOutputReport" << std::endl;
          if (!HidD_SetOutputReport(m_hidHandle, (PVOID)m_sendBuf.data(), useLength))
            return false;
        }

        if (Error != ERROR_IO_PENDING) {
          fmt::print(stderr, fmt("Write Failed {:08X}\n"), int(Error));
          return false;
        }
      }

      if (!GetOverlappedResult(m_hidHandle, &Overlapped, &BytesWritten, TRUE)) {
        DWORD Error = GetLastError();
        fmt::print(stderr, fmt("Write Failed {:08X}\n"), int(Error));
        return false;
      }
    } else if (tp == HIDReportType::Feature) {
      DWORD useLength = DWORD(std::max(length, m_minFeatureSz));
      if (!HidD_SetFeature(m_hidHandle, (PVOID)m_sendBuf.data(), useLength)) {
        // int error = GetLastError();
        return false;
      }
    }
    return true;
  }

  size_t _receiveHIDReport(uint8_t* data, size_t length, HIDReportType tp, uint32_t message) {
    size_t maxIn = std::max(m_minFeatureSz, std::max(m_minInputSz, length));
    if (m_recvBuf.size() < maxIn)
      m_recvBuf.resize(maxIn);
    memset(m_recvBuf.data(), 0, length);
    m_recvBuf[0] = message;

    if (tp == HIDReportType::Input) {
      if (!HidD_GetInputReport(m_hidHandle, m_recvBuf.data(), ULONG(std::max(m_minInputSz, length))))
        return 0;
    } else if (tp == HIDReportType::Feature) {
      if (!HidD_GetFeature(m_hidHandle, m_recvBuf.data(), ULONG(std::max(m_minFeatureSz, length))))
        return 0;
    }

    memmove(data, m_recvBuf.data(), length);
    return length;
  }

public:
  HIDDeviceWinUSB(DeviceToken& token, const std::shared_ptr<DeviceBase>& devImp)
  : m_token(token), m_devImp(devImp), m_devPath(token.getDevicePath()) {}

  void _startThread() {
    std::unique_lock<std::mutex> lk(m_initMutex);
    DeviceType dType = m_token.getDeviceType();
    if (dType == DeviceType::USB)
      m_thread = std::thread(_threadProcUSBLL, std::static_pointer_cast<HIDDeviceWinUSB>(shared_from_this()));
    else if (dType == DeviceType::Bluetooth)
      m_thread = std::thread(_threadProcBTLL, std::static_pointer_cast<HIDDeviceWinUSB>(shared_from_this()));
    else if (dType == DeviceType::HID)
      m_thread = std::thread(_threadProcHID, std::static_pointer_cast<HIDDeviceWinUSB>(shared_from_this()));
    else
      throw std::runtime_error("invalid token supplied to device constructor");
    m_initCond.wait(lk);
  }

  ~HIDDeviceWinUSB() {
    m_runningTransferLoop = false;
    if (m_thread.joinable())
      m_thread.detach();
  }

  OVERLAPPED m_overlapped = {};

  void ReadCycle(uint8_t* inBuffer, size_t inBufferSz) {
    ResetEvent(m_overlapped.hEvent);
    ZeroMemory(inBuffer, inBufferSz);
    DWORD BytesRead = 0;
    BOOL Result = ReadFile(m_hidHandle, inBuffer, DWORD(inBufferSz), &BytesRead, &m_overlapped);
    if (!Result) {
      DWORD Error = GetLastError();
      if (Error == ERROR_DEVICE_NOT_CONNECTED) {
        m_runningTransferLoop = false;
        return;
      } else if (Error != ERROR_IO_PENDING) {
        fmt::print(stderr, fmt("Read Failed: {:08X}\n"), int(Error));
        return;
      } else if (!GetOverlappedResultEx(m_hidHandle, &m_overlapped, &BytesRead, 10, TRUE)) {
        return;
      }
    }

    m_devImp->receivedHIDReport(inBuffer, BytesRead, HIDReportType::Input, inBuffer[0]);
  }
};

std::shared_ptr<IHIDDevice> IHIDDeviceNew(DeviceToken& token, const std::shared_ptr<DeviceBase>& devImp) {
  return std::make_shared<HIDDeviceWinUSB>(token, devImp);
}

} // namespace boo