/*
 Copyright (c) 2008-2009 TrueCrypt Developers Association. All rights reserved.

 Governed by the TrueCrypt License 3.0 the full text of which is contained in
 the file License.txt included in TrueCrypt binary and source code distribution
 packages.
*/

#include "System.h"
#include "Main/GraphicUserInterface.h"
#include "Volume/Hash.h"
#include "KeyfileGeneratorDialog.h"

namespace VeraCrypt
{
	KeyfileGeneratorDialog::KeyfileGeneratorDialog (wxWindow* parent) : KeyfileGeneratorDialogBase (parent) 
	{
		RandomNumberGenerator::Start();
		
		Hashes = Hash::GetAvailableAlgorithms();
		foreach (shared_ptr <Hash> hash, Hashes)
		{
			if (!hash->IsDeprecated())
				HashChoice->Append (hash->GetName(), hash.get());
		}

		HashChoice->Select (0);
		RandomNumberGenerator::SetHash (Gui->GetSelectedData <Hash> (HashChoice)->GetNew());

		ShowBytes (RandomPoolStaticText, RandomNumberGenerator::PeekPool().GetRange (0, 24));
		MouseStaticText->Wrap (Gui->GetCharWidth (MouseStaticText) * 70);

		MainSizer->SetMinSize (wxSize (-1, Gui->GetCharHeight (this) * 24));

		Layout();
		Fit();
		Center();

		foreach (wxWindow *c, this->GetChildren())
			c->Connect (wxEVT_MOTION, wxMouseEventHandler (KeyfileGeneratorDialog::OnMouseMotion), nullptr, this);
	}

	KeyfileGeneratorDialog::~KeyfileGeneratorDialog ()
	{
	}

	void KeyfileGeneratorDialog::OnGenerateButtonClick (wxCommandEvent& event)
	{
		try
		{
			int keyfilesCount = NumberOfKeyfiles->GetValue();
			int keyfilesSize = KeyfilesSize->GetValue();		
			bool useRandomSize = RandomSizeCheckBox->IsChecked();
			wxString keyfileBaseName = KeyfilesBaseName->GetValue();
			keyfileBaseName.Trim(true);
			keyfileBaseName.Trim(false);
			
			if (keyfileBaseName.IsEmpty())
			{
				Gui->ShowWarning("KEYFILE_EMPTY_BASE_NAME");
				return;
			}
			
			wxFileName baseFileName = wxFileName::FileName (keyfileBaseName);
			if (!baseFileName.IsOk())
			{
				Gui->ShowWarning("KEYFILE_INVALID_BASE_NAME");
				return;
			}
			
			DirectoryPath keyfilesDir = Gui->SelectDirectory (Gui->GetActiveWindow(), LangString["SELECT_KEYFILE_GENERATION_DIRECTORY"], false);
			if (keyfilesDir.IsEmpty())
				return;
				
			wxFileName dirFileName = wxFileName::DirName( wstring(keyfilesDir).c_str() );
			if (!dirFileName.IsDirWritable ())
			{
				Gui->ShowWarning(L"You don't have write permission on the selected directory");
				return;
			}
				
			wxBusyCursor busy;
			for (int i = 0; i < keyfilesCount; i++)
			{
				int bufferLen;
				if (useRandomSize)
				{
					SecureBuffer sizeBuffer (sizeof(int));
					RandomNumberGenerator::GetData (sizeBuffer, true);
					
					memcpy(&bufferLen, sizeBuffer.Ptr(), sizeof(int));

					/* since keyfilesSize < 1024 * 1024, we mask with 0x000FFFFF */
					bufferLen = (long) (((unsigned long) bufferLen) & 0x000FFFFF);

					bufferLen %= ((1024*1024 - 64) + 1);
					bufferLen += 64;								
				}
				else
					bufferLen = keyfilesSize;

				SecureBuffer keyfileBuffer (bufferLen);
				RandomNumberGenerator::GetData (keyfileBuffer, true);
								
				wstringstream convertStream;
				convertStream << i;
				wxString suffix = L"_";				
				suffix += convertStream.str().c_str();				
				
				wxFileName keyfileName;
				if (i == 0)
				{
					keyfileName.Assign(dirFileName.GetPath(), keyfileBaseName);
				}
				else
				{
					if (baseFileName.HasExt())
					{
						keyfileName.Assign(dirFileName.GetPath(), baseFileName.GetName() + suffix + L"." + baseFileName.GetExt());
					}
					else
					{
						keyfileName.Assign(dirFileName.GetPath(), keyfileBaseName + suffix);
					}
				}
				
				if (keyfileName.Exists())
				{
					wxString msg = wxString::Format(LangString["KEYFILE_ALREADY_EXISTS"], keyfileName.GetFullPath());
					if (!Gui->AskYesNo (msg, false, true))
						return;				
				}

				{
					FilePath keyfilePath((const wchar_t*) keyfileName.GetFullPath());
					File keyfile;
					keyfile.Open (keyfilePath, File::CreateWrite);
					keyfile.Write (keyfileBuffer);
				}

			}
			Gui->ShowInfo ("KEYFILE_CREATED");
		}
		catch (exception &e)
		{
			Gui->ShowError (e);
		}
	}

	void KeyfileGeneratorDialog::OnHashSelected (wxCommandEvent& event)
	{
		RandomNumberGenerator::SetHash (Gui->GetSelectedData <Hash> (HashChoice)->GetNew());
	}

	void KeyfileGeneratorDialog::OnMouseMotion (wxMouseEvent& event)
	{
		event.Skip();

		RandomNumberGenerator::AddToPool (ConstBufferPtr (reinterpret_cast <byte *> (&event), sizeof (event)));

		long coord = event.GetX();
		RandomNumberGenerator::AddToPool (ConstBufferPtr (reinterpret_cast <byte *> (&coord), sizeof (coord)));
		coord = event.GetY();
		RandomNumberGenerator::AddToPool (ConstBufferPtr (reinterpret_cast <byte *> (&coord), sizeof (coord)));

		if (ShowRandomPoolCheckBox->IsChecked())
			ShowBytes (RandomPoolStaticText, RandomNumberGenerator::PeekPool().GetRange (0, 24));
	}
	
	void KeyfileGeneratorDialog::OnShowRandomPoolCheckBoxClicked (wxCommandEvent& event)
	{
		if (!event.IsChecked())
			RandomPoolStaticText->SetLabel (L"");
	}

	void KeyfileGeneratorDialog::OnRandomSizeCheckBoxClicked (wxCommandEvent& event)
	{
		if (!event.IsChecked())
			KeyfilesSize->Enable();
		else
			KeyfilesSize->Disable();
	}

	void KeyfileGeneratorDialog::ShowBytes (wxStaticText *textCtrl, const ConstBufferPtr &buffer, bool appendDots)
	{
		wxString str;

		for (size_t i = 0; i < buffer.Size(); ++i)
		{
			str += wxString::Format (L"%02X", buffer[i]);
		}

		if (appendDots)
			str += L"..";

		textCtrl->SetLabel (str.c_str());

		for (size_t i = 0; i < str.size(); ++i)
		{
			str[i] = L'X';
		}
	}
}