/** @file
  File explorer related functions.

Copyright (c) 2004 - 2011, Intel Corporation. All rights reserved.<BR>
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 "BootMaint.h"

/**
  Update the File Explore page.

  @param CallbackData    The BMM context data.
  @param MenuOption      Pointer to menu options to display.

**/
VOID
UpdateFileExplorePage (
  IN BMM_CALLBACK_DATA            *CallbackData,
  BM_MENU_OPTION                  *MenuOption
  )
{
  UINTN           Index;
  BM_MENU_ENTRY   *NewMenuEntry;
  BM_FILE_CONTEXT *NewFileContext;
  EFI_FORM_ID     FormId;

  NewMenuEntry    = NULL;
  NewFileContext  = NULL;
  FormId          = 0;

  RefreshUpdateData ();
  mStartLabel->Number = FORM_FILE_EXPLORER_ID;

  for (Index = 0; Index < MenuOption->MenuNumber; Index++) {
    NewMenuEntry    = BOpt_GetMenuEntry (MenuOption, Index);
    NewFileContext  = (BM_FILE_CONTEXT *) NewMenuEntry->VariableContext;

    if (NewFileContext->IsBootLegacy) {
      continue;
    }

    if ((NewFileContext->IsDir) || (FileExplorerStateBootFromFile == CallbackData->FeCurrentState)) {
      //
      // Create Text opcode for directory, also create Text opcode for file in FileExplorerStateBootFromFile.
      //
      HiiCreateActionOpCode (
        mStartOpCodeHandle,
        (UINT16) (FILE_OPTION_OFFSET + Index),
        NewMenuEntry->DisplayStringToken,
        STRING_TOKEN (STR_NULL_STRING),
        EFI_IFR_FLAG_CALLBACK,
        0
        );
    } else {
      //
      // Create Goto opcode for file in FileExplorerStateAddBootOption or FileExplorerStateAddDriverOptionState.
      //
      if (FileExplorerStateAddBootOption == CallbackData->FeCurrentState) {
        FormId = FORM_BOOT_ADD_DESCRIPTION_ID;
      } else if (FileExplorerStateAddDriverOptionState == CallbackData->FeCurrentState) {
        FormId = FORM_DRIVER_ADD_FILE_DESCRIPTION_ID;
      }

      HiiCreateGotoOpCode (
        mStartOpCodeHandle,
        FormId,
        NewMenuEntry->DisplayStringToken,
        STRING_TOKEN (STR_NULL_STRING),
        EFI_IFR_FLAG_CALLBACK,
        (UINT16) (FILE_OPTION_OFFSET + Index)
        );
    }
  }

  HiiUpdateForm (
    CallbackData->FeHiiHandle,
    &gFileExploreFormSetGuid,
    FORM_FILE_EXPLORER_ID,
    mStartOpCodeHandle, // Label FORM_FILE_EXPLORER_ID
    mEndOpCodeHandle    // LABEL_END
    );
}

/**
  Update the file explower page with the refershed file system.


  @param CallbackData    BMM context data
  @param KeyValue        Key value to identify the type of data to expect.

  @retval  TRUE           Inform the caller to create a callback packet to exit file explorer.
  @retval  FALSE          Indicate that there is no need to exit file explorer.

**/
BOOLEAN
UpdateFileExplorer (
  IN BMM_CALLBACK_DATA            *CallbackData,
  IN UINT16                       KeyValue
  )
{
  UINT16          FileOptionMask;
  BM_MENU_ENTRY   *NewMenuEntry;
  BM_FILE_CONTEXT *NewFileContext;
  EFI_FORM_ID     FormId;
  BOOLEAN         ExitFileExplorer;
  EFI_STATUS      Status;

  NewMenuEntry      = NULL;
  NewFileContext    = NULL;
  ExitFileExplorer  = FALSE;

  FileOptionMask    = (UINT16) (FILE_OPTION_MASK & KeyValue);

  if (FileExplorerDisplayUnknown == CallbackData->FeDisplayContext) {
    //
    // First in, display file system.
    //
    BOpt_FreeMenu (&FsOptionMenu);
    BOpt_FindFileSystem (CallbackData);
    CreateMenuStringToken (CallbackData, CallbackData->FeHiiHandle, &FsOptionMenu);

    UpdateFileExplorePage (CallbackData, &FsOptionMenu);

    CallbackData->FeDisplayContext = FileExplorerDisplayFileSystem;
  } else {
    if (FileExplorerDisplayFileSystem == CallbackData->FeDisplayContext) {
      NewMenuEntry = BOpt_GetMenuEntry (&FsOptionMenu, FileOptionMask);
    } else if (FileExplorerDisplayDirectory == CallbackData->FeDisplayContext) {
      NewMenuEntry = BOpt_GetMenuEntry (&DirectoryMenu, FileOptionMask);
    }

    NewFileContext                  = (BM_FILE_CONTEXT *) NewMenuEntry->VariableContext;

    if (NewFileContext->IsDir ) {
      CallbackData->FeDisplayContext = FileExplorerDisplayDirectory;

      RemoveEntryList (&NewMenuEntry->Link);
      BOpt_FreeMenu (&DirectoryMenu);
      Status = BOpt_FindFiles (CallbackData, NewMenuEntry);
       if (EFI_ERROR (Status)) {
         ExitFileExplorer = TRUE;
         goto exit;
       }
      CreateMenuStringToken (CallbackData, CallbackData->FeHiiHandle, &DirectoryMenu);
      BOpt_DestroyMenuEntry (NewMenuEntry);

      UpdateFileExplorePage (CallbackData, &DirectoryMenu);

    } else {
      switch (CallbackData->FeCurrentState) {
      case FileExplorerStateBootFromFile:
        //
        // Here boot from file
        //
        BootThisFile (NewFileContext);
        //
        // Set proper video resolution and text mode for setup.
        //
        ChangeModeForSetup ();
        ExitFileExplorer = TRUE;
        break;

      case FileExplorerStateAddBootOption:
      case FileExplorerStateAddDriverOptionState:
        if (FileExplorerStateAddBootOption == CallbackData->FeCurrentState) {
          FormId = FORM_BOOT_ADD_DESCRIPTION_ID;
        } else {
          FormId = FORM_DRIVER_ADD_FILE_DESCRIPTION_ID;
        }

        CallbackData->MenuEntry = NewMenuEntry;
        CallbackData->LoadContext->FilePathList = ((BM_FILE_CONTEXT *) (CallbackData->MenuEntry->VariableContext))->DevicePath;

        //
        // Create Subtitle op-code for the display string of the option.
        //
        RefreshUpdateData ();
        mStartLabel->Number = FormId;

        HiiCreateSubTitleOpCode (
          mStartOpCodeHandle,
          NewMenuEntry->DisplayStringToken,
          0,
          0,
          0
          );

        HiiUpdateForm (
          CallbackData->FeHiiHandle,
          &gFileExploreFormSetGuid,
          FormId,
          mStartOpCodeHandle, // Label FormId
          mEndOpCodeHandle    // LABEL_END
          );
        break;

      default:
        break;
      }
    }
  }
  exit:
  return ExitFileExplorer;
}

/**
  This function processes the results of changes in configuration.
  When user select a interactive opcode, this callback will be triggered.
  Based on the Question(QuestionId) that triggers the callback, the corresponding
  actions is performed. It handles:

  1) the addition of boot option.
  2) the addition of driver option.
  3) exit from file browser
  4) update of file content if a dir is selected.
  5) boot the file if a file is selected in "boot from file"


  @param This            Points to the EFI_HII_CONFIG_ACCESS_PROTOCOL.
  @param Action          Specifies the type of action taken by the browser.
  @param QuestionId      A unique value which is sent to the original exporting driver
                         so that it can identify the type of data to expect.
  @param Type            The type of value for the question.
  @param Value           A pointer to the data being sent to the original exporting driver.
  @param ActionRequest   On return, points to the action requested by the callback function.

  @retval  EFI_SUCCESS           The callback successfully handled the action.
  @retval  EFI_OUT_OF_RESOURCES  Not enough storage is available to hold the variable and its data.
  @retval  EFI_DEVICE_ERROR      The variable could not be saved.
  @retval  EFI_UNSUPPORTED       The specified Action is not supported by the callback.
  @retval  EFI_INVALID_PARAMETER If paramter Value or ActionRequest is NULL.
**/
EFI_STATUS
EFIAPI
FileExplorerCallback (
  IN  CONST EFI_HII_CONFIG_ACCESS_PROTOCOL   *This,
  IN  EFI_BROWSER_ACTION                     Action,
  IN  EFI_QUESTION_ID                        QuestionId,
  IN  UINT8                                  Type,
  IN  EFI_IFR_TYPE_VALUE                     *Value,
  OUT EFI_BROWSER_ACTION_REQUEST             *ActionRequest
  )
{
  BMM_CALLBACK_DATA     *Private;
  FILE_EXPLORER_NV_DATA *NvRamMap;
  EFI_STATUS            Status;

  if (Action == EFI_BROWSER_ACTION_CHANGING) {
    if ((Value == NULL) || (ActionRequest == NULL)) {
      return EFI_INVALID_PARAMETER;
    }

    Status         = EFI_SUCCESS;
    Private        = FE_CALLBACK_DATA_FROM_THIS (This);
    *ActionRequest = EFI_BROWSER_ACTION_REQUEST_NONE;

    //
    // Retrieve uncommitted data from Form Browser
    //
    NvRamMap = &Private->FeFakeNvData;
    HiiGetBrowserData (&gFileExploreFormSetGuid, mFileExplorerStorageName, sizeof (FILE_EXPLORER_NV_DATA), (UINT8 *) NvRamMap);

    if (QuestionId == KEY_VALUE_SAVE_AND_EXIT_BOOT || QuestionId == KEY_VALUE_SAVE_AND_EXIT_DRIVER) {
      //
      // Apply changes and exit formset
      //
      if (FileExplorerStateAddBootOption == Private->FeCurrentState) {
        Status = Var_UpdateBootOption (Private, NvRamMap);
        if (EFI_ERROR (Status)) {
          return Status;
        }

        BOpt_GetBootOptions (Private);
        CreateMenuStringToken (Private, Private->FeHiiHandle, &BootOptionMenu);
      } else if (FileExplorerStateAddDriverOptionState == Private->FeCurrentState) {
        Status = Var_UpdateDriverOption (
                  Private,
                  Private->FeHiiHandle,
                  NvRamMap->DescriptionData,
                  NvRamMap->OptionalData,
                  NvRamMap->ForceReconnect
                  );
        if (EFI_ERROR (Status)) {
          return Status;
        }

        BOpt_GetDriverOptions (Private);
        CreateMenuStringToken (Private, Private->FeHiiHandle, &DriverOptionMenu);
      }

      *ActionRequest = EFI_BROWSER_ACTION_REQUEST_EXIT;
    } else if (QuestionId == KEY_VALUE_NO_SAVE_AND_EXIT_BOOT || QuestionId == KEY_VALUE_NO_SAVE_AND_EXIT_DRIVER) {
      //
      // Discard changes and exit formset
      //
      NvRamMap->OptionalData[0]     = 0x0000;
      NvRamMap->DescriptionData[0]  = 0x0000;
      *ActionRequest = EFI_BROWSER_ACTION_REQUEST_EXIT;
    } else if (QuestionId < FILE_OPTION_OFFSET) {
      //
      // Exit File Explorer formset
      //
      *ActionRequest = EFI_BROWSER_ACTION_REQUEST_EXIT;
    } else {
      if (UpdateFileExplorer (Private, QuestionId)) {
        *ActionRequest = EFI_BROWSER_ACTION_REQUEST_EXIT;
      }
    }

    return Status;
  }
  //
  // All other action return unsupported.
  //
  return EFI_UNSUPPORTED;
}