/** @file
  Copyright (C) 2005 - 2015, Apple Inc.  All rights reserved.<BR>

  This program and the accompanying materials have not been licensed.
  Neither is its usage, its redistribution, in source or binary form,
  licensed, nor implicitely or explicitely permitted, except when
  required by applicable law.

  Unless required by applicable law or agreed to in writing, software
  distributed is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES
  OR CONDITIONS OF ANY KIND, either express or implied.
**/

#include <Library/UefiLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/DebugLib.h>
#include <Library/UefiBootServicesTableLib.h>

#include <Protocol/AppleKeyState.h>
#include <Protocol/AppleKeyMapDatabase.h>
#include <Protocol/AppleEvent.h>
#include "AppleKeyAggregator.h"

extern EFI_GUID gAppleEventProtocolGuid;

STATIC APPLE_EVENT_PROTOCOL mAppleEventProtocol = {
  1,
  NULL,
  NULL,
  NULL,
  NULL,
  NULL
};

// KeyMapGetKeyStrokesByIndex
APPLE_KEY_STROKES_INFO *
KeyMapGetKeyStrokesByIndex (
                            IN LIST_ENTRY *List,
                            IN UINTN          Index
                            ) // sub_459
{
  APPLE_KEY_STROKES_INFO *KeyStrokesInfo;
  
  KeyStrokesInfo = APPLE_KEY_STROKES_INFO_FROM_LIST_ENTRY(GetFirstNode(List));
  
  while (KeyStrokesInfo->Hdr.Index != Index) {
    if (IsNull(List, &KeyStrokesInfo->Hdr.This)) {
      KeyStrokesInfo = NULL;
      break;
    }
    
    KeyStrokesInfo = APPLE_KEY_STROKES_INFO_FROM_LIST_ENTRY(GetNextNode(List, &KeyStrokesInfo->Hdr.This));
  }
  
  return KeyStrokesInfo;
}

// KeyMapBubbleSort
VOID
KeyMapBubbleSort (
                  IN OUT UINT16 *Operand,
                  IN     UINTN  NoChilds
                  ) // sub_72C
{
  UINTN  NoRemainingChilds;
  UINTN  Index;
  UINTN  NoRemainingChilds2;
  UINT16 *OperandPtr;
  UINT16 FirstChild;
  
  if (!Operand || !NoChilds) {
    return;
  }
  
  if (Operand != NULL) {
    ++Operand;
    NoRemainingChilds = (NoChilds - 1);
    Index             = 1;
    
    do {
      NoRemainingChilds2 = NoRemainingChilds;
      OperandPtr         = Operand;
      
      if (Index < NoChilds) {
        do {
          FirstChild = Operand[-1];
          
          if (FirstChild > *OperandPtr) {
            Operand[-1] = *OperandPtr;
            *OperandPtr = FirstChild;
          }
          
          ++OperandPtr;
          --NoRemainingChilds2;
        } while (NoRemainingChilds2 > 0);
      }
      
      ++Index;
      ++Operand;
    } while ((NoRemainingChilds--) > 0);
  }
}

EFI_STATUS
EFIAPI
KeyMapCreateKeyStrokesBuffer (
                              IN  APPLE_KEY_MAP_DATABASE_PROTOCOL  *This,
                              IN  UINTN                            KeyBufferSize,
                              OUT UINTN                            *Index
                              )
{
  EFI_STATUS               Status;
  
  APPLE_KEY_MAP_AGGREGATOR *Aggregator;
  UINTN                    BufferSize;
  APPLE_KEY                *Memory;
  APPLE_KEY_STROKES_INFO   *KeyStrokesInfo;
  
  if (!This || !Index) {
    return EFI_INVALID_PARAMETER;
  }
  
  Aggregator = APPLE_KEY_MAP_AGGREGATOR_PRIVATE_FROM_DATABASE (This);
  
  if (Aggregator->KeyBuffer != NULL) {
    gBS->FreePool((VOID *)Aggregator->KeyBuffer);
  }
  
  BufferSize                 = (Aggregator->KeyBuffersSize + KeyBufferSize);
  Aggregator->KeyBuffersSize = BufferSize;
  Memory                     = AllocateZeroPool(BufferSize);
  Aggregator->KeyBuffer      = Memory;
  Status                     = EFI_OUT_OF_RESOURCES;
  
  if (Memory != NULL) {
    KeyStrokesInfo = AllocateZeroPool(sizeof (APPLE_KEY_STROKES_INFO)
                                       + (KeyBufferSize * sizeof (APPLE_KEY)));
    Status         = EFI_OUT_OF_RESOURCES;
    
    if (KeyStrokesInfo != NULL) {
      KeyStrokesInfo->Hdr.Signature     = APPLE_KEY_STROKES_INFO_SIGNATURE;
      KeyStrokesInfo->Hdr.KeyBufferSize = KeyBufferSize;
      KeyStrokesInfo->Hdr.Index         = Aggregator->NextKeyStrokeIndex;
      ++Aggregator->NextKeyStrokeIndex;
      
      InsertTailList (&Aggregator->KeyStrokesInfoList,
                      &KeyStrokesInfo->Hdr.This);
      
      Status = EFI_SUCCESS;
      *Index = KeyStrokesInfo->Hdr.Index;
    }
  }  
  return Status;
}

EFI_STATUS
EFIAPI
KeyMapRemoveKeyStrokesBuffer (
                              IN APPLE_KEY_MAP_DATABASE_PROTOCOL  *This,
                              IN UINTN                            Index
                              )
{
  EFI_STATUS               Status;
  
  APPLE_KEY_MAP_AGGREGATOR *Aggregator;
  APPLE_KEY_STROKES_INFO   *KeyStrokesInfo;
  
  if (!This) {
    return EFI_INVALID_PARAMETER;
  }
  
  Aggregator     = APPLE_KEY_MAP_AGGREGATOR_PRIVATE_FROM_DATABASE (This);
  KeyStrokesInfo = KeyMapGetKeyStrokesByIndex (&Aggregator->KeyStrokesInfoList, Index);
  
  Status         = EFI_NOT_FOUND;
  
  if (KeyStrokesInfo != NULL) {
    Aggregator->KeyBuffersSize -= KeyStrokesInfo->Hdr.KeyBufferSize;
    
    RemoveEntryList (&KeyStrokesInfo->Hdr.This);
    gBS->FreePool((VOID *)KeyStrokesInfo);
    
    Status = EFI_SUCCESS;
  }
  
  return Status;
}
//->SetKeyStrokeBufferKeys => Index=3000, Modifiers=0, NoKeys=0, Keys={5518, 0}, Status=Success
EFI_STATUS
EFIAPI
KeyMapSetKeyStrokeBufferKeys (
                              IN APPLE_KEY_MAP_DATABASE_PROTOCOL  *This,
                              IN UINTN                            Index,
                              IN APPLE_MODIFIER_MAP               Modifiers,
                              IN UINTN                            NumberOfKeys,
                              IN APPLE_KEY                        *Keys
                              )
{
  EFI_STATUS               Status;
  
  APPLE_KEY_MAP_AGGREGATOR *Aggregator;
  APPLE_KEY_STROKES_INFO   *KeyStrokesInfo;
  
  if (!This || !Keys) {
    return EFI_INVALID_PARAMETER;
  }
  
  Aggregator     = APPLE_KEY_MAP_AGGREGATOR_PRIVATE_FROM_DATABASE (This);
  KeyStrokesInfo = KeyMapGetKeyStrokesByIndex (&Aggregator->KeyStrokesInfoList, Index);
  Status         = EFI_NOT_FOUND;
  
  if (KeyStrokesInfo != NULL) {
    Status = EFI_OUT_OF_RESOURCES;
    
    if (KeyStrokesInfo->Hdr.KeyBufferSize >= NumberOfKeys) {
      KeyStrokesInfo->Hdr.NumberOfKeys = NumberOfKeys;
      KeyStrokesInfo->Hdr.Modifiers    = Modifiers;
      
      CopyMem((VOID *)&KeyStrokesInfo->Keys, (VOID *)Keys, (NumberOfKeys * sizeof(APPLE_KEY)));
      
      Status = EFI_SUCCESS;
    }
  }
  
  return Status;
}

//->ReadKeyState(), count=1, flags=0x0 states={7028,0}, status=Success
EFI_STATUS
EFIAPI
ReadKeyState (APPLE_KEY_STATE_PROTOCOL* This,
              OUT UINT16 *ModifyFlags,
              OUT UINTN  *PressedKeyCount,
              OUT APPLE_KEY *Keys)
{
  EFI_STATUS               Status;
  
  APPLE_KEY_MAP_AGGREGATOR *Aggregator;
  APPLE_KEY_STROKES_INFO   *KeyStrokesInfo;
  APPLE_MODIFIER_MAP       DbModifiers;
  BOOLEAN                  Result;
  UINTN                    DbNoKeyStrokes;
  UINTN                    Index;
  UINTN                    Index2;
  APPLE_KEY                Key;
  
  if (!This || !ModifyFlags || !PressedKeyCount) {
    return EFI_INVALID_PARAMETER;
  }
  
  Aggregator     = APPLE_KEY_MAP_AGGREGATOR_PRIVATE_FROM_AGGREGATOR (This);
  KeyStrokesInfo = APPLE_KEY_STROKES_INFO_FROM_LIST_ENTRY (GetFirstNode (&Aggregator->KeyStrokesInfoList));
  Result         = IsNull (&Aggregator->KeyStrokesInfoList, &KeyStrokesInfo->Hdr.This);
  
  if (Result) {
    *PressedKeyCount  = 0;
    DbNoKeyStrokes    = 0;
    DbModifiers       = 0;
  } else {
    DbModifiers       = 0;
    DbNoKeyStrokes    = 0;
    
    do {
      DbModifiers |= KeyStrokesInfo->Hdr.Modifiers;     
      if (KeyStrokesInfo->Hdr.NumberOfKeys > 0) {
        Index = 0;        
        do {
          Key = (&KeyStrokesInfo->Keys)[Index];
          ++Index;          
          for (Index2 = 0; Index2 < DbNoKeyStrokes; ++Index2) {
            if (Aggregator->KeyBuffer[Index2] == Key) {
              break;
            }
          }          
          if (DbNoKeyStrokes == Index2) {
            Aggregator->KeyBuffer[DbNoKeyStrokes] = Key;
            ++DbNoKeyStrokes;
          }
        } while (Index < KeyStrokesInfo->Hdr.NumberOfKeys);
      }
      
      KeyStrokesInfo = APPLE_KEY_STROKES_INFO_FROM_LIST_ENTRY (
                                                               GetNextNode (&Aggregator->KeyStrokesInfoList,
                                                                            &KeyStrokesInfo->Hdr.This)
                                                               );
      Result         = IsNull(&Aggregator->KeyStrokesInfoList, &KeyStrokesInfo->Hdr.This);
    } while (!Result);
    
    Result  = (DbNoKeyStrokes > *PressedKeyCount);
    *PressedKeyCount = DbNoKeyStrokes;
    Status  = EFI_BUFFER_TOO_SMALL;
    
    if (Result) {
      return Status;
    }
  }
  
  *ModifyFlags = DbModifiers;
  *PressedKeyCount    = DbNoKeyStrokes;
  Status     = EFI_SUCCESS;
  
  if (Keys != NULL) {
    CopyMem((VOID *)Keys, (VOID *)Aggregator->KeyBuffer, (DbNoKeyStrokes * sizeof(APPLE_KEY)));
  }
    
  return Status;
}

#define DB_KEYS_NUM 8

EFI_STATUS
EFIAPI
SearchKeyStroke (APPLE_KEY_STATE_PROTOCOL* This,
                 IN UINT16 ModifyFlags,
                 IN UINTN PressedKeyCount,
                 IN OUT APPLE_KEY *Keys,
                 IN BOOLEAN ExactMatch)
{
  EFI_STATUS         Status;
  
  UINTN              DbNoKeys;
  APPLE_KEY          DbKeys[DB_KEYS_NUM];
  APPLE_MODIFIER_MAP DbModifiers;
  INTN               Result;
  UINTN              Index;
  UINTN              DbIndex;

  if (!This || !Keys) {
    return EFI_INVALID_PARAMETER;
  }
  if (!PressedKeyCount) {
    return EFI_NOT_FOUND;
  }
  
  DbNoKeys = DB_KEYS_NUM;
  Status   = This->ReadKeyState(This, &DbModifiers, &DbNoKeys, DbKeys);
  
  if (!EFI_ERROR(Status)) {
    if (ExactMatch) {
      Status = EFI_NOT_FOUND;
      
      if ((DbModifiers == ModifyFlags) && (DbNoKeys == PressedKeyCount)) {
        KeyMapBubbleSort ((UINT16 *)Keys, PressedKeyCount);
        KeyMapBubbleSort ((UINT16 *)DbKeys, DbNoKeys);
        
        Result = CompareMem ((VOID *)Keys, (VOID *)DbKeys, (PressedKeyCount * sizeof (APPLE_KEY)));
        
        if (Result == 0) {
          Status = EFI_SUCCESS;
        }
      }
    } else {
      Status = EFI_NOT_FOUND;
      
      if ((DbModifiers & ModifyFlags) == ModifyFlags) {
        for (Index = 0; Index < PressedKeyCount; ++Index) {
          for (DbIndex = 0; DbIndex < DbNoKeys; ++DbIndex) {
            if (Keys[Index] == DbKeys[DbIndex]) {
              break;
            }
          }
          if (DbNoKeys == DbIndex) {
            break;
          }          
          Status = EFI_SUCCESS;
        }
      }
    }
  }  
  return Status;
}


// AggregatorEntryPoint
/**

  @param[in] ImageHandle  The firmware allocated handle for the EFI image.
  @param[in] SystemTable  A pointer to the EFI System Table.

  @retval EFI_SUCCESS          The entry point is executed successfully.
  @retval EFI_ALREADY_STARTED  The protocol has already been installed.
**/
EFI_STATUS
EFIAPI
AggregatorEntryPoint (
  IN EFI_HANDLE        ImageHandle,
  IN EFI_SYSTEM_TABLE  *SystemTable
  ) // start
{
  EFI_STATUS               Status;

  UINTN                    NumberHandles;
  EFI_HANDLE               *Buffer;
  APPLE_KEY_MAP_AGGREGATOR *Aggregator;
  EFI_HANDLE               Handle;

  Status = gBS->LocateHandleBuffer (
                  ByProtocol,
                  &gAppleKeyMapDatabaseProtocolGuid,
                  NULL,
                  &NumberHandles,
                  &Buffer
                  );

  if (!EFI_ERROR(Status)) {
    Status = EFI_DEVICE_ERROR;

    if (Buffer != NULL) {
      gBS->FreePool((VOID *)Buffer);
    }
  } else {
    Aggregator                                          = AllocateZeroPool(sizeof(APPLE_KEY_MAP_AGGREGATOR));
    Aggregator->Signature                               = APPLE_KEY_MAP_AGGREGATOR_SIGNATURE;
    Aggregator->NextKeyStrokeIndex                      = 3000;
    Aggregator->DatabaseProtocol.Revision               = APPLE_KEY_MAP_PROTOCOLS_REVISION;
    Aggregator->DatabaseProtocol.CreateKeyStrokesBuffer = KeyMapCreateKeyStrokesBuffer;
    Aggregator->DatabaseProtocol.RemoveKeyStrokesBuffer = KeyMapRemoveKeyStrokesBuffer;
    Aggregator->DatabaseProtocol.SetKeyStrokeBufferKeys = KeyMapSetKeyStrokeBufferKeys;
    Aggregator->AggregatorProtocol.Signature            = APPLE_KEY_MAP_PROTOCOLS_REVISION;
    Aggregator->AggregatorProtocol.ReadKeyState         = ReadKeyState;
    Aggregator->AggregatorProtocol.SearchKeyStroke      = SearchKeyStroke;
    InitializeListHead (&Aggregator->KeyStrokesInfoList);

    Handle = NULL;
    Status = gBS->InstallMultipleProtocolInterfaces (
                    &Handle,
                    &gAppleKeyMapDatabaseProtocolGuid,
                    (VOID *)&Aggregator->DatabaseProtocol,
                    &gAppleKeyStateProtocolGuid,
                    (VOID *)&Aggregator->AggregatorProtocol,
                    &gAppleEventProtocolGuid,
                    &mAppleEventProtocol,
                    NULL
                    );
/*
    if (!EFI_ERROR(Status)) {
      Status = gBS->InstallProtocolInterface(ImageHandle, &gAppleEventProtocolGuid, EFI_NATIVE_INTERFACE, &mAppleEventProtocol);
    }
 */
  }

  return Status;
}