/** @file
  Copyright (C) 2019, vit9696. All rights reserved.

  All rights reserved.

  This program and the accompanying materials
  are licensed and made available under the terms and conditions of the BSD License
  which accompanies this distribution.  The full text of the license may be found at
  http://opensource.org/licenses/bsd-license.php

  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/

#include <Uefi.h>

#include <Library/DebugLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/UefiLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Protocol/LoadedImage.h>
#include <Protocol/ShellParameters.h>

EFI_STATUS
GetArguments (
  OUT UINTN   *Argc,
  OUT CHAR16  ***Argv
  )
{
  STATIC CHAR16  *StArgv[2] = { L"Self", NULL };

  EFI_STATUS                     Status;
  EFI_SHELL_PARAMETERS_PROTOCOL  *ShellParameters;
  EFI_LOADED_IMAGE_PROTOCOL      *LoadedImage;

  Status = gBS->HandleProtocol (
                  gImageHandle,
                  &gEfiShellParametersProtocolGuid,
                  (VOID **)&ShellParameters
                  );
  if (!EFI_ERROR (Status)) {
    *Argc = ShellParameters->Argc;
    *Argv = ShellParameters->Argv;
    return EFI_SUCCESS;
  }

  Status = gBS->HandleProtocol (
                  gImageHandle,
                  &gEfiLoadedImageProtocolGuid,
                  (VOID **)&LoadedImage
                  );

  if (EFI_ERROR (Status)) {
    DEBUG ((DEBUG_WARN, "OCM: LoadedImage cannot be located - %r\n", Status));
  }

  if (EFI_ERROR (Status) || (LoadedImage->LoadOptions == NULL)) {
    *Argc = 1;
    *Argv = StArgv;
    return EFI_SUCCESS;
  }

  StArgv[1] = LoadedImage->LoadOptions;
  *Argc     = ARRAY_SIZE (StArgv);
  *Argv     = StArgv;
  return EFI_SUCCESS;
}

EFI_STATUS
OcUninstallAllProtocolInstances (
  EFI_GUID  *Protocol
  )
{
  EFI_STATUS  Status;
  EFI_HANDLE  *Handles;
  UINTN       Index;
  UINTN       NoHandles;
  VOID        *OriginalProto;

  Status = gBS->LocateHandleBuffer (
                  ByProtocol,
                  Protocol,
                  NULL,
                  &NoHandles,
                  &Handles
                  );

  if (Status == EFI_NOT_FOUND) {
    return EFI_SUCCESS;
  }

  if (EFI_ERROR (Status)) {
    return Status;
  }

  for (Index = 0; Index < NoHandles; ++Index) {
    Status = gBS->HandleProtocol (
                    Handles[Index],
                    Protocol,
                    &OriginalProto
                    );

    if (EFI_ERROR (Status)) {
      break;
    }

    Status = gBS->UninstallProtocolInterface (
                    Handles[Index],
                    Protocol,
                    OriginalProto
                    );

    if (EFI_ERROR (Status)) {
      break;
    }
  }

  FreePool (Handles);

  return Status;
}

EFI_STATUS
OcHandleProtocolFallback (
  IN  EFI_HANDLE  Handle,
  IN  EFI_GUID    *Protocol,
  OUT VOID        **Interface
  )
{
  EFI_STATUS  Status;

  Status = gBS->HandleProtocol (
                  Handle,
                  Protocol,
                  Interface
                  );
  if (EFI_ERROR (Status)) {
    Status = gBS->LocateProtocol (
                    Protocol,
                    NULL,
                    Interface
                    );
  }

  return Status;
}

UINTN
OcCountProtocolInstances (
  IN EFI_GUID  *Protocol
  )
{
  EFI_STATUS  Status;
  UINTN       HandleCount;
  EFI_HANDLE  *HandleBuffer;

  HandleCount = 0;

  Status = gBS->LocateHandleBuffer (
                  ByProtocol,
                  Protocol,
                  NULL,
                  &HandleCount,
                  &HandleBuffer
                  );
  if (EFI_ERROR (Status)) {
    //
    // No instance can be found on error.
    //
    return 0;
  }

  FreePool (HandleBuffer);

  return HandleCount;
}

VOID *
OcGetProtocol (
  IN  EFI_GUID     *Protocol,
  IN  UINTN        ErrorLevel,
  IN  CONST CHAR8  *CallerName     OPTIONAL,
  IN  CONST CHAR8  *ProtocolName   OPTIONAL
  )
{
  EFI_STATUS  Status;
  VOID        *Instance;

  Status = gBS->LocateProtocol (
                  Protocol,
                  NULL,
                  (VOID **)&Instance
                  );

  if (EFI_ERROR (Status)) {
    Instance = NULL;
    if (ErrorLevel != 0) {
      if (ProtocolName != NULL) {
        DEBUG ((ErrorLevel, "OCM: %a cannot get protocol %s - %r\n", CallerName, ProtocolName, Status));
      } else {
        DEBUG ((ErrorLevel, "OCM: %a cannot get protocol %g - %r\n", CallerName, Protocol, Status));
      }
    }
  }

  return Instance;
}