/** @file
  Main file for NULL named library for level 1 shell command functions.

  (C) Copyright 2013 Hewlett-Packard Development Company, L.P.<BR>
  Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved.<BR>
  SPDX-License-Identifier: BSD-2-Clause-Patent

**/

#include "UefiShellLevel1CommandsLib.h"

STATIC CONST CHAR16  mFileName[]           = L"ShellCommands";
EFI_HII_HANDLE       gShellLevel1HiiHandle = NULL;

/**
  Return the help text filename.  Only used if no HII information found.

  @retval the filename.
**/
CONST CHAR16 *
EFIAPI
ShellCommandGetManFileNameLevel1 (
  VOID
  )
{
  return (mFileName);
}

/**
  Constructor for the Shell Level 1 Commands library.

  Install the handlers for level 1 UEFI Shell 2.0 commands.

  @param ImageHandle    the image handle of the process
  @param SystemTable    the EFI System Table pointer

  @retval EFI_SUCCESS        the shell command handlers were installed successfully
  @retval EFI_UNSUPPORTED    the shell level required was not found.
**/
EFI_STATUS
EFIAPI
ShellLevel1CommandsLibConstructor (
  IN EFI_HANDLE        ImageHandle,
  IN EFI_SYSTEM_TABLE  *SystemTable
  )
{
  //
  // if shell level is less than 2 do nothing
  //
  if (PcdGet8 (PcdShellSupportLevel) < 1) {
    return (EFI_SUCCESS);
  }

  gShellLevel1HiiHandle = HiiAddPackages (&gShellLevel1HiiGuid, gImageHandle, UefiShellLevel1CommandsLibStrings, NULL);
  if (gShellLevel1HiiHandle == NULL) {
    return (EFI_DEVICE_ERROR);
  }

  //
  // install our shell command handlers that are always installed
  //
  ShellCommandRegisterCommandName (L"stall", ShellCommandRunStall, ShellCommandGetManFileNameLevel1, 1, L"", FALSE, gShellLevel1HiiHandle, (EFI_STRING_ID)(PcdGet8 (PcdShellSupportLevel) < 3 ? 0 : STRING_TOKEN (STR_GET_HELP_STALL)));
  ShellCommandRegisterCommandName (L"for", ShellCommandRunFor, ShellCommandGetManFileNameLevel1, 1, L"", FALSE, gShellLevel1HiiHandle, (EFI_STRING_ID)(PcdGet8 (PcdShellSupportLevel) < 3 ? 0 : STRING_TOKEN (STR_GET_HELP_FOR)));
  ShellCommandRegisterCommandName (L"goto", ShellCommandRunGoto, ShellCommandGetManFileNameLevel1, 1, L"", FALSE, gShellLevel1HiiHandle, (EFI_STRING_ID)(PcdGet8 (PcdShellSupportLevel) < 3 ? 0 : STRING_TOKEN (STR_GET_HELP_GOTO)));
  ShellCommandRegisterCommandName (L"if", ShellCommandRunIf, ShellCommandGetManFileNameLevel1, 1, L"", FALSE, gShellLevel1HiiHandle, (EFI_STRING_ID)(PcdGet8 (PcdShellSupportLevel) < 3 ? 0 : STRING_TOKEN (STR_GET_HELP_IF)));
  ShellCommandRegisterCommandName (L"shift", ShellCommandRunShift, ShellCommandGetManFileNameLevel1, 1, L"", FALSE, gShellLevel1HiiHandle, (EFI_STRING_ID)(PcdGet8 (PcdShellSupportLevel) < 3 ? 0 : STRING_TOKEN (STR_GET_HELP_SHIFT)));
  ShellCommandRegisterCommandName (L"exit", ShellCommandRunExit, ShellCommandGetManFileNameLevel1, 1, L"", TRUE, gShellLevel1HiiHandle, (EFI_STRING_ID)(PcdGet8 (PcdShellSupportLevel) < 3 ? 0 : STRING_TOKEN (STR_GET_HELP_EXIT)));
  ShellCommandRegisterCommandName (L"else", ShellCommandRunElse, ShellCommandGetManFileNameLevel1, 1, L"", FALSE, gShellLevel1HiiHandle, (EFI_STRING_ID)(PcdGet8 (PcdShellSupportLevel) < 3 ? 0 : STRING_TOKEN (STR_GET_HELP_ELSE)));
  ShellCommandRegisterCommandName (L"endif", ShellCommandRunEndIf, ShellCommandGetManFileNameLevel1, 1, L"", FALSE, gShellLevel1HiiHandle, (EFI_STRING_ID)(PcdGet8 (PcdShellSupportLevel) < 3 ? 0 : STRING_TOKEN (STR_GET_HELP_ENDIF)));
  ShellCommandRegisterCommandName (L"endfor", ShellCommandRunEndFor, ShellCommandGetManFileNameLevel1, 1, L"", FALSE, gShellLevel1HiiHandle, (EFI_STRING_ID)(PcdGet8 (PcdShellSupportLevel) < 3 ? 0 : STRING_TOKEN (STR_GET_HELP_ENDFOR)));

  return (EFI_SUCCESS);
}

/**
  Destructor for the library.  free any resources.

  @param ImageHandle            The image handle of the process.
  @param SystemTable            The EFI System Table pointer.
**/
EFI_STATUS
EFIAPI
ShellLevel1CommandsLibDestructor (
  IN EFI_HANDLE        ImageHandle,
  IN EFI_SYSTEM_TABLE  *SystemTable
  )
{
  if (gShellLevel1HiiHandle != NULL) {
    HiiRemovePackages (gShellLevel1HiiHandle);
  }

  return (EFI_SUCCESS);
}

/**
  Test a node to see if meets the criterion.

  It functions so that count starts at 1 and it increases or decreases when it
  hits the specified tags.  when it hits zero the location has been found.

  DecrementerTag and IncrementerTag are used to get around for/endfor and
  similar paired types where the entire middle should be ignored.

  If label is used it will be used instead of the count.

  @param[in] Function          The function to use to enumerate through the
                               list.  Normally GetNextNode or GetPreviousNode.
  @param[in] DecrementerTag    The tag to decrement the count at.
  @param[in] IncrementerTag    The tag to increment the count at.
  @param[in] Label             A label to look for.
  @param[in, out] ScriptFile   The pointer to the current script file structure.
  @param[in] MovePast          TRUE makes function return 1 past the found
                               location.
  @param[in] FindOnly          TRUE to not change the ScriptFile.
  @param[in] CommandNode       The pointer to the Node to test.
  @param[in, out] TargetCount  The pointer to the current count.
**/
BOOLEAN
TestNodeForMove (
  IN CONST LIST_MANIP_FUNC      Function,
  IN CONST CHAR16               *DecrementerTag,
  IN CONST CHAR16               *IncrementerTag,
  IN CONST CHAR16               *Label OPTIONAL,
  IN OUT SCRIPT_FILE            *ScriptFile,
  IN CONST BOOLEAN              MovePast,
  IN CONST BOOLEAN              FindOnly,
  IN CONST SCRIPT_COMMAND_LIST  *CommandNode,
  IN OUT UINTN                  *TargetCount
  )
{
  BOOLEAN  Found;
  CHAR16   *CommandName;
  CHAR16   *CommandNameWalker;
  CHAR16   *TempLocation;

  Found = FALSE;

  //
  // get just the first part of the command line...
  //
  CommandName = NULL;
  CommandName = StrnCatGrow (&CommandName, NULL, CommandNode->Cl, 0);
  if (CommandName == NULL) {
    return (FALSE);
  }

  CommandNameWalker = CommandName;

  //
  // Skip leading spaces and tabs.
  //
  while ((CommandNameWalker[0] == L' ') || (CommandNameWalker[0] == L'\t')) {
    CommandNameWalker++;
  }

  TempLocation = StrStr (CommandNameWalker, L" ");

  if (TempLocation != NULL) {
    *TempLocation = CHAR_NULL;
  }

  //
  // did we find a nested item ?
  //
  if (gUnicodeCollation->StriColl (
                           gUnicodeCollation,
                           (CHAR16 *)CommandNameWalker,
                           (CHAR16 *)IncrementerTag
                           ) == 0)
  {
    (*TargetCount)++;
  } else if (gUnicodeCollation->StriColl (
                                  gUnicodeCollation,
                                  (CHAR16 *)CommandNameWalker,
                                  (CHAR16 *)DecrementerTag
                                  ) == 0)
  {
    if (*TargetCount > 0) {
      (*TargetCount)--;
    }
  }

  //
  // did we find the matching one...
  //
  if (Label == NULL) {
    if (*TargetCount == 0) {
      Found = TRUE;
      if (!FindOnly) {
        if (MovePast) {
          ScriptFile->CurrentCommand = (SCRIPT_COMMAND_LIST *)(*Function)(&ScriptFile->CommandList, &CommandNode->Link);
        } else {
          ScriptFile->CurrentCommand = (SCRIPT_COMMAND_LIST *)CommandNode;
        }
      }
    }
  } else {
    if (  (gUnicodeCollation->StriColl (
                                gUnicodeCollation,
                                (CHAR16 *)CommandNameWalker,
                                (CHAR16 *)Label
                                ) == 0)
       && ((*TargetCount) == 0))
    {
      Found = TRUE;
      if (!FindOnly) {
        //
        // we found the target label without loops
        //
        if (MovePast) {
          ScriptFile->CurrentCommand = (SCRIPT_COMMAND_LIST *)(*Function)(&ScriptFile->CommandList, &CommandNode->Link);
        } else {
          ScriptFile->CurrentCommand = (SCRIPT_COMMAND_LIST *)CommandNode;
        }
      }
    }
  }

  //
  // Free the memory for this loop...
  //
  FreePool (CommandName);
  return (Found);
}

/**
  Move the script pointer from 1 tag (line) to another.

  It functions so that count starts at 1 and it increases or decreases when it
  hits the specified tags.  when it hits zero the location has been found.

  DecrementerTag and IncrementerTag are used to get around for/endfor and
  similar paired types where the entire middle should be ignored.

  If label is used it will be used instead of the count.

  @param[in] Function          The function to use to enumerate through the
                               list.  Normally GetNextNode or GetPreviousNode.
  @param[in] DecrementerTag    The tag to decrement the count at.
  @param[in] IncrementerTag    The tag to increment the count at.
  @param[in] Label             A label to look for.
  @param[in, out] ScriptFile   The pointer to the current script file structure.
  @param[in] MovePast          TRUE makes function return 1 past the found
                               location.
  @param[in] FindOnly          TRUE to not change the ScriptFile.
  @param[in] WrapAroundScript  TRUE to wrap end-to-beginning or vise versa in
                               searching.
**/
BOOLEAN
MoveToTag (
  IN CONST LIST_MANIP_FUNC  Function,
  IN CONST CHAR16           *DecrementerTag,
  IN CONST CHAR16           *IncrementerTag,
  IN CONST CHAR16           *Label OPTIONAL,
  IN OUT SCRIPT_FILE        *ScriptFile,
  IN CONST BOOLEAN          MovePast,
  IN CONST BOOLEAN          FindOnly,
  IN CONST BOOLEAN          WrapAroundScript
  )
{
  SCRIPT_COMMAND_LIST  *CommandNode;
  BOOLEAN              Found;
  UINTN                TargetCount;

  if (Label == NULL) {
    TargetCount = 1;
  } else {
    TargetCount = 0;
  }

  if (ScriptFile == NULL) {
    return FALSE;
  }

  for (CommandNode = (SCRIPT_COMMAND_LIST *)(*Function)(&ScriptFile->CommandList, &ScriptFile->CurrentCommand->Link), Found = FALSE
       ; !IsNull (&ScriptFile->CommandList, &CommandNode->Link) && !Found
       ; CommandNode = (SCRIPT_COMMAND_LIST *)(*Function)(&ScriptFile->CommandList, &CommandNode->Link)
       )
  {
    Found = TestNodeForMove (
              Function,
              DecrementerTag,
              IncrementerTag,
              Label,
              ScriptFile,
              MovePast,
              FindOnly,
              CommandNode,
              &TargetCount
              );
  }

  if (WrapAroundScript && !Found) {
    for (CommandNode = (SCRIPT_COMMAND_LIST *)GetFirstNode (&ScriptFile->CommandList), Found = FALSE
         ; CommandNode != ScriptFile->CurrentCommand && !Found
         ; CommandNode = (SCRIPT_COMMAND_LIST *)(*Function)(&ScriptFile->CommandList, &CommandNode->Link)
         )
    {
      Found = TestNodeForMove (
                Function,
                DecrementerTag,
                IncrementerTag,
                Label,
                ScriptFile,
                MovePast,
                FindOnly,
                CommandNode,
                &TargetCount
                );
    }
  }

  return (Found);
}