//
// Copyright (c) 2008 Advanced Micro Devices, Inc. All rights reserved.
//

#include "cl_common.hpp"
#ifdef _WIN32
#include <d3d10_1.h>
#include "cl_d3d9_amd.hpp"
#include "cl_d3d10_amd.hpp"
#include "cl_d3d11_amd.hpp"
#endif  //_WIN32

#include <icd/loader/icd_dispatch.h>

#include <mutex>

amd::PlatformIDS amd::PlatformID::Platform =  //{ NULL };
    {amd::ICDDispatchedObject::icdVendorDispatch_};

static cl_int CL_API_CALL icdGetPlatformInfo(cl_platform_id platform, cl_platform_info param_name,
                                             size_t param_value_size, void* param_value,
                                             size_t* param_value_size_ret) {
  return NULL ; //clGetPlatformInfo(NULL, param_name, param_value_size, param_value, param_value_size_ret);
}

static cl_int CL_API_CALL icdGetDeviceIDs(cl_platform_id platform, cl_device_type device_type,
                                          cl_uint num_entries, cl_device_id* devices,
                                          cl_uint* num_devices) {
  return NULL ;//clGetDeviceIDs(NULL, device_type, num_entries, devices, num_devices);
}

static cl_int CL_API_CALL icdGetDeviceInfo(cl_device_id device, cl_device_info param_name,
                                           size_t param_value_size, void* param_value,
                                           size_t* param_value_size_ret) {
  if (param_name == CL_DEVICE_PLATFORM) {
    // Return the ICD platform instead of the default NULL platform.
    cl_platform_id platform = reinterpret_cast<cl_platform_id>(&amd::PlatformID::Platform);
    return amd::clGetInfo(platform, param_value_size, param_value, param_value_size_ret);
  }

  return NULL ; //clGetDeviceInfo(device, param_name, param_value_size, param_value, param_value_size_ret);
}

KHRicdVendorDispatch amd::ICDDispatchedObject::icdVendorDispatch_[] = {
    {NULL /* should not get called */, icdGetPlatformInfo, icdGetDeviceIDs, icdGetDeviceInfo} 
#if 0
     clCreateContext, clCreateContextFromType, clRetainContext, clReleaseContext, clGetContextInfo,
     clCreateCommandQueue, clRetainCommandQueue, clReleaseCommandQueue, clGetCommandQueueInfo,
     clSetCommandQueueProperty, clCreateBuffer, clCreateImage2D, clCreateImage3D, clRetainMemObject,
     clReleaseMemObject, clGetSupportedImageFormats, clGetMemObjectInfo, clGetImageInfo,
     clCreateSampler, clRetainSampler, clReleaseSampler, clGetSamplerInfo,
     clCreateProgramWithSource, clCreateProgramWithBinary, clRetainProgram, clReleaseProgram,
     clBuildProgram, clUnloadCompiler, clGetProgramInfo, clGetProgramBuildInfo, clCreateKernel,
     clCreateKernelsInProgram, clRetainKernel, clReleaseKernel, clSetKernelArg, clGetKernelInfo,
     clGetKernelWorkGroupInfo, clWaitForEvents, clGetEventInfo, clRetainEvent, clReleaseEvent,
     clGetEventProfilingInfo, clFlush, clFinish, clEnqueueReadBuffer, clEnqueueWriteBuffer,
     clEnqueueCopyBuffer, clEnqueueReadImage, clEnqueueWriteImage, clEnqueueCopyImage,
     clEnqueueCopyImageToBuffer, clEnqueueCopyBufferToImage, clEnqueueMapBuffer, clEnqueueMapImage,
     clEnqueueUnmapMemObject, clEnqueueNDRangeKernel, clEnqueueTask, clEnqueueNativeKernel,
     clEnqueueMarker, clEnqueueWaitForEvents, clEnqueueBarrier, clGetExtensionFunctionAddress,
     clCreateFromGLBuffer, clCreateFromGLTexture2D, clCreateFromGLTexture3D,
     clCreateFromGLRenderbuffer, clGetGLObjectInfo, clGetGLTextureInfo, clEnqueueAcquireGLObjects,
     clEnqueueReleaseGLObjects, clGetGLContextInfoKHR,
     WINDOWS_SWITCH(clGetDeviceIDsFromD3D10KHR, NULL),
     WINDOWS_SWITCH(clCreateFromD3D10BufferKHR, NULL),
     WINDOWS_SWITCH(clCreateFromD3D10Texture2DKHR, NULL),
     WINDOWS_SWITCH(clCreateFromD3D10Texture3DKHR, NULL),
     WINDOWS_SWITCH(clEnqueueAcquireD3D10ObjectsKHR, NULL),
     WINDOWS_SWITCH(clEnqueueReleaseD3D10ObjectsKHR, NULL), clSetEventCallback, clCreateSubBuffer,
     clSetMemObjectDestructorCallback, clCreateUserEvent, clSetUserEventStatus,
     clEnqueueReadBufferRect, clEnqueueWriteBufferRect, clEnqueueCopyBufferRect,
     NULL, NULL, NULL, clCreateEventFromGLsyncKHR,

     /* OpenCL 1.2*/
     clCreateSubDevices, clRetainDevice, clReleaseDevice, clCreateImage,
     clCreateProgramWithBuiltInKernels, clCompileProgram, clLinkProgram, clUnloadPlatformCompiler,
     clGetKernelArgInfo, clEnqueueFillBuffer, clEnqueueFillImage, clEnqueueMigrateMemObjects,
     clEnqueueMarkerWithWaitList, clEnqueueBarrierWithWaitList,
     clGetExtensionFunctionAddressForPlatform, clCreateFromGLTexture,

     WINDOWS_SWITCH(clGetDeviceIDsFromD3D11KHR, NULL),
     WINDOWS_SWITCH(clCreateFromD3D11BufferKHR, NULL),
     WINDOWS_SWITCH(clCreateFromD3D11Texture2DKHR, NULL),
     WINDOWS_SWITCH(clCreateFromD3D11Texture3DKHR, NULL),
     WINDOWS_SWITCH(clCreateFromDX9MediaSurfaceKHR, NULL),
     WINDOWS_SWITCH(clEnqueueAcquireD3D11ObjectsKHR, NULL),
     WINDOWS_SWITCH(clEnqueueReleaseD3D11ObjectsKHR, NULL),

     WINDOWS_SWITCH(clGetDeviceIDsFromDX9MediaAdapterKHR,
                    NULL),  // KHRpfn_clGetDeviceIDsFromDX9MediaAdapterKHR
                            // clGetDeviceIDsFromDX9MediaAdapterKHR;
     WINDOWS_SWITCH(
         clEnqueueAcquireDX9MediaSurfacesKHR,
         NULL),  // KHRpfn_clEnqueueAcquireDX9MediaSurfacesKHR clEnqueueAcquireDX9MediaSurfacesKHR;
     WINDOWS_SWITCH(
         clEnqueueReleaseDX9MediaSurfacesKHR,
         NULL),  // KHRpfn_clEnqueueReleaseDX9MediaSurfacesKHR clEnqueueReleaseDX9MediaSurfacesKHR;

     NULL,
     NULL, NULL, NULL,

     clCreateCommandQueueWithProperties, clCreatePipe, clGetPipeInfo, clSVMAlloc, clSVMFree,
     clEnqueueSVMFree, clEnqueueSVMMemcpy, clEnqueueSVMMemFill, clEnqueueSVMMap, clEnqueueSVMUnmap,
     clCreateSamplerWithProperties, clSetKernelArgSVMPointer, clSetKernelExecInfo,
     clGetKernelSubGroupInfo,
     clCloneKernel,
     clCreateProgramWithIL,
     clEnqueueSVMMigrateMem,
     clGetDeviceAndHostTimer,
     clGetHostTimer,
     clGetKernelSubGroupInfo,
     clSetDefaultDeviceCommandQueue,

     clSetProgramReleaseCallback,
     clSetProgramSpecializationConstant }
#endif 
     };

#if defined(ATI_OS_WIN)
#include <Shlwapi.h>

#pragma comment(lib, "shlwapi.lib")

static bool ShouldLoadPlatform() {
  // Get the OpenCL ICD registry values
  HKEY platformsKey = NULL;
  if (RegOpenKeyExA(HKEY_LOCAL_MACHINE, "SOFTWARE\\Khronos\\OpenCL\\Vendors", 0, KEY_READ,
                    &platformsKey) != ERROR_SUCCESS)
    return true;

  std::vector<std::string> registryValues;
  DWORD dwIndex = 0;
  while (true) {
    char cszLibraryName[1024] = {0};
    DWORD dwLibraryNameSize = sizeof(cszLibraryName);
    DWORD dwLibraryNameType = 0;
    DWORD dwValue = 0;
    DWORD dwValueSize = sizeof(dwValue);

    if (RegEnumValueA(platformsKey, dwIndex++, cszLibraryName, &dwLibraryNameSize, NULL,
                      &dwLibraryNameType, (LPBYTE)&dwValue, &dwValueSize) != ERROR_SUCCESS)
      break;
    // Require that the value be a DWORD and equal zero
    if (dwLibraryNameType != REG_DWORD || dwValue != 0) {
      continue;
    }
    registryValues.push_back(cszLibraryName);
  }
  RegCloseKey(platformsKey);

  HMODULE hm = NULL;
  if (!GetModuleHandleExA(
          GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS | GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT,
          (LPCSTR)&ShouldLoadPlatform, &hm))
    return true;

  char cszDllPath[1024] = {0};
  if (!GetModuleFileNameA(hm, cszDllPath, sizeof(cszDllPath))) return true;

  // If we are loaded from the DriverStore, then there should be a registry
  // value matching our current module absolute path.
  if (std::find(registryValues.begin(), registryValues.end(), cszDllPath) == registryValues.end())
    return true;

  LPSTR cszFileName;
  char buffer[1024] = {0};
  if (!GetFullPathNameA(cszDllPath, sizeof(buffer), buffer, &cszFileName)) return true;

  // We found an absolute path in the registry that matched this DLL, now
  // check if there is also an entry with the same filename.
  if (std::find(registryValues.begin(), registryValues.end(), cszFileName) == registryValues.end())
    return true;

  // Lastly, check if there is a DLL with the same name in the System folder.
  char cszSystemPath[1024] = {0};
#if defined(ATI_BITS_32)
  if (!GetSystemWow64DirectoryA(cszSystemPath, sizeof(cszSystemPath)))
#endif  // defined(ATI_BITS_32)
    if (!GetSystemDirectoryA(cszSystemPath, sizeof(cszSystemPath))) return true;

  std::string systemDllPath;
  systemDllPath.append(cszSystemPath).append("\\").append(cszFileName);
  if (!PathFileExistsA(systemDllPath.c_str())) {
    return true;
  }

  // If we get here, then all 3 conditions are true:
  // - An entry in the registry with an absolute path matches the current DLL
  // - An entry in the registry with a relative path matches the current DLL
  // - A DLL with the same name was found in the system directory
  //
  // We should not load this platform!

  return false;
}

#else

#include <dlfcn.h>

// If there is only one platform, load it.
// If there is more than one platform, only load platforms that have visible devices
// If all platforms have no devices available, only load the PAL platform
static bool ShouldLoadPlatform() {
  bool shouldLoad = true;

  if (!amd::Runtime::initialized()) {
    amd::Runtime::init();
  }
  const int numDevices = amd::Device::numDevices(CL_DEVICE_TYPE_GPU, false);

  void *otherPlatform = nullptr;
  if (amd::IS_LEGACY) {
    otherPlatform = dlopen("libamdocl64.so", RTLD_LAZY);
    if (otherPlatform != nullptr) { // Present platform exists
      shouldLoad = numDevices > 0;
    }
  } else {
    otherPlatform = dlopen("libamdocl-orca64.so", RTLD_LAZY);
    if (otherPlatform != nullptr) { // Legacy platform exists
      // gcc4.8 doesn't support casting void* to a function pointer
      // Work around this by creating a typedef untill we upgrade the compiler
      typedef void*(*clGetFunctionAddress_t)(const char *);
      typedef cl_int(*clIcdGetPlatformIDs_t)(cl_uint, cl_platform_id *, cl_uint *);

      clGetFunctionAddress_t legacyGetFunctionAddress =
        reinterpret_cast<clGetFunctionAddress_t>(dlsym(otherPlatform, "clGetExtensionFunctionAddress"));
      clIcdGetPlatformIDs_t legacyGetPlatformIDs =
        reinterpret_cast<clIcdGetPlatformIDs_t>(legacyGetFunctionAddress("clIcdGetPlatformIDsKHR"));

      cl_uint numLegacyPlatforms = 0;
      legacyGetPlatformIDs(0, nullptr, &numLegacyPlatforms);

      shouldLoad = (numDevices > 0) || (numLegacyPlatforms == 0);
    }
  }

  if (otherPlatform != nullptr) {
    dlclose(otherPlatform);
  }

  return shouldLoad;
}

#endif // defined(ATI_OS_WIN)

CL_API_ENTRY cl_int CL_API_CALL clIcdGetPlatformIDsKHR(cl_uint num_entries,
                                                       cl_platform_id* platforms,
                                                       cl_uint* num_platforms) {
  if (((num_entries > 0 || num_platforms == NULL) && platforms == NULL) ||
      (num_entries == 0 && platforms != NULL)) {
    return CL_INVALID_VALUE;
  }

  static bool shouldLoad = true;

  static std::once_flag initOnce;
  std::call_once(initOnce, [](){ shouldLoad = ShouldLoadPlatform(); });

  if (!shouldLoad) {
    *not_null(num_platforms) = 0;
    return CL_SUCCESS;
  }

  if (!amd::Runtime::initialized()) {
    amd::Runtime::init();
  }

  if (num_platforms != NULL && platforms == NULL) {
    *num_platforms = 1;
    return CL_SUCCESS;
  }

  assert(platforms != NULL && "check the code above");
  *platforms = reinterpret_cast<cl_platform_id>(&amd::PlatformID::Platform);

  *not_null(num_platforms) = 1;
  return CL_SUCCESS;
}