/** @file
  implements menubar interface functions.

  Copyright (c) 2005 - 2018, Intel Corporation. All rights reserved. <BR>
  SPDX-License-Identifier: BSD-2-Clause-Patent

**/

#include "EditMenuBar.h"
#include "UefiShellDebug1CommandsLib.h"
#include "EditStatusBar.h"

EDITOR_MENU_ITEM    *MenuItems;
MENU_ITEM_FUNCTION  *ControlBasedMenuFunctions;
UINTN               NumItems;

/**
  Cleanup function for a menu bar.  frees all allocated memory.
**/
VOID
MenuBarCleanup (
  VOID
  )
{
  SHELL_FREE_NON_NULL (MenuItems);
}

/**
  Initialize the menu bar with the specified items.

  @param[in] Items              The items to display and their functions.

  @retval EFI_SUCCESS           The initialization was correct.
  @retval EFI_OUT_OF_RESOURCES  A memory allocation failed.
**/
EFI_STATUS
MenuBarInit (
  IN CONST EDITOR_MENU_ITEM  *Items
  )
{
  CONST EDITOR_MENU_ITEM  *ItemsWalker;

  for (NumItems = 0, ItemsWalker = Items; ItemsWalker != NULL && ItemsWalker->Function != NULL; ItemsWalker++, NumItems++) {
  }

  MenuItems = AllocateZeroPool ((NumItems+1) * sizeof (EDITOR_MENU_ITEM));
  if (MenuItems == NULL) {
    return EFI_OUT_OF_RESOURCES;
  }

  CopyMem (MenuItems, Items, (NumItems+1) * sizeof (EDITOR_MENU_ITEM));
  return EFI_SUCCESS;
}

/**
  Initialize the control hot-key with the specified items.

  @param[in] Items              The hot-key functions.

  @retval EFI_SUCCESS           The initialization was correct.
**/
EFI_STATUS
ControlHotKeyInit (
  IN MENU_ITEM_FUNCTION  *Items
  )
{
  ControlBasedMenuFunctions = Items;
  return EFI_SUCCESS;
}

/**
  Refresh function for the menu bar.

  @param[in] LastRow            The last printable row.
  @param[in] LastCol            The last printable column.

  @retval EFI_SUCCESS           The refresh was successful.
**/
EFI_STATUS
MenuBarRefresh (
  IN CONST UINTN  LastRow,
  IN CONST UINTN  LastCol
  )
{
  EDITOR_MENU_ITEM  *Item;
  UINTN             Col;
  UINTN             Row;
  UINTN             Width;
  CHAR16            *NameString;
  CHAR16            *FunctionKeyString;

  //
  // variable initialization
  //
  Col = 1;
  Row = (LastRow - 2);

  //
  // clear menu bar rows
  //
  EditorClearLine (LastRow - 2, LastCol, LastRow);
  EditorClearLine (LastRow - 1, LastCol, LastRow);
  EditorClearLine (LastRow, LastCol, LastRow);

  //
  // print out the menu items
  //
  for (Item = MenuItems; Item != NULL && Item->Function != NULL; Item++) {
    NameString = HiiGetString (gShellDebug1HiiHandle, Item->NameToken, NULL);

    Width = MAX ((StrLen (NameString) + 6), 20);
    if (((Col + Width) > LastCol)) {
      Row++;
      Col = 1;
    }

    FunctionKeyString = HiiGetString (gShellDebug1HiiHandle, Item->FunctionKeyToken, NULL);

    ShellPrintEx ((INT32)(Col) - 1, (INT32)(Row) - 1, L"%E%s%N  %H%s%N  ", FunctionKeyString, NameString);

    FreePool (NameString);
    FreePool (FunctionKeyString);
    Col += Width;
  }

  return EFI_SUCCESS;
}

/**
  Function to dispatch the correct function based on a function key (F1...)

  @param[in] Key                The pressed key.

  @retval EFI_NOT_FOUND         The key was not a valid function key
                                (an error was sent to the status bar).
  @return The return value from the called dispatch function.
**/
EFI_STATUS
MenuBarDispatchFunctionKey (
  IN CONST EFI_INPUT_KEY  *Key
  )
{
  UINTN  Index;

  Index = Key->ScanCode - SCAN_F1;

  //
  // check whether in range
  //
  if (Index > (NumItems - 1)) {
    StatusBarSetStatusString (L"Unknown Command");
    return EFI_SUCCESS;
  }

  return (MenuItems[Index].Function ());
}

/**
  Function to dispatch the correct function based on a control-based key (ctrl+o...)

  @param[in] KeyData                The pressed key.

  @retval EFI_NOT_FOUND         The key was not a valid control-based key
                                (an error was sent to the status bar).
  @return EFI_SUCCESS.
**/
EFI_STATUS
MenuBarDispatchControlHotKey (
  IN CONST EFI_KEY_DATA  *KeyData
  )
{
  UINT16  ControlIndex;

  //
  // Set to invalid value first.
  //
  ControlIndex = MAX_UINT16;

  if (((KeyData->KeyState.KeyShiftState & EFI_SHIFT_STATE_VALID) == 0) ||
      (KeyData->KeyState.KeyShiftState == EFI_SHIFT_STATE_VALID))
  {
    //
    // For consoles that don't support/report shift state,
    // Ctrl+A is translated to 1 (UnicodeChar).
    //
    ControlIndex = KeyData->Key.UnicodeChar;
  } else if (((KeyData->KeyState.KeyShiftState & EFI_SHIFT_STATE_VALID) != 0) &&
             ((KeyData->KeyState.KeyShiftState & (EFI_RIGHT_CONTROL_PRESSED | EFI_LEFT_CONTROL_PRESSED)) != 0) &&
             ((KeyData->KeyState.KeyShiftState & ~(EFI_SHIFT_STATE_VALID | EFI_RIGHT_CONTROL_PRESSED | EFI_LEFT_CONTROL_PRESSED)) == 0))
  {
    //
    // For consoles that supports/reports shift state,
    // make sure only CONTROL is pressed.
    //
    if ((KeyData->Key.UnicodeChar >= L'A') && (KeyData->Key.UnicodeChar <= L'Z')) {
      ControlIndex = KeyData->Key.UnicodeChar - L'A' + 1;
    } else if ((KeyData->Key.UnicodeChar >= L'a') && (KeyData->Key.UnicodeChar <= L'z')) {
      ControlIndex = KeyData->Key.UnicodeChar - L'a' + 1;
    }
  }

  if (  (SCAN_CONTROL_Z < ControlIndex)
     || (NULL == ControlBasedMenuFunctions[ControlIndex]))
  {
    return EFI_NOT_FOUND;
  }

  ControlBasedMenuFunctions[ControlIndex]();
  return EFI_SUCCESS;
}