/*
 Copyright (c) 2008 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 "KeyfilesDialog.h"
#include "VolumePasswordPanel.h"
#include "SecurityTokenKeyfilesDialog.h"

namespace VeraCrypt
{
	VolumePasswordPanel::VolumePasswordPanel (wxWindow* parent, shared_ptr <VolumePassword> password, shared_ptr <KeyfileList> keyfiles, bool enableCache, bool enablePassword, bool enableKeyfiles, bool enableConfirmation, bool enablePkcs5Prf, const wxString &passwordLabel)
		: VolumePasswordPanelBase (parent), Keyfiles (new KeyfileList)
	{
		if (keyfiles)
		{
			*Keyfiles = *keyfiles;
			UseKeyfilesCheckBox->SetValue (!Keyfiles->empty());
		}
		else
		{
			*Keyfiles = Gui->GetPreferences().DefaultKeyfiles;
			UseKeyfilesCheckBox->SetValue (Gui->GetPreferences().UseKeyfiles && !Keyfiles->empty());
		}

		PasswordTextCtrl->SetMaxLength (VolumePassword::MaxSize);
		ConfirmPasswordTextCtrl->SetMaxLength (VolumePassword::MaxSize);

		if (!passwordLabel.empty())
		{
			PasswordStaticText->SetLabel (passwordLabel);
			GridBagSizer->Detach (PasswordStaticText);
			GridBagSizer->Add (PasswordStaticText, wxGBPosition (0, 1), wxGBSpan (1, 1), wxALIGN_CENTER_VERTICAL | wxBOTTOM, Gui->GetDefaultBorderSize());
		}

		CacheCheckBox->Show (enableCache);
		
		if (!enablePassword && enableKeyfiles)
		{
			Layout();
			Fit();
			PasswordPlaceholderSizer->SetMinSize (wxSize (PasswordTextCtrl->GetSize().GetWidth(), -1));
		}
		else if (!enablePkcs5Prf)
		{
			GridBagSizer->Remove (PasswordPlaceholderSizer);
		}

		PasswordStaticText->Show (enablePassword);
		PasswordTextCtrl->Show (enablePassword);
		DisplayPasswordCheckBox->Show (enablePassword);

		ConfirmPasswordStaticText->Show (enableConfirmation);
		ConfirmPasswordTextCtrl->Show (enableConfirmation);
		
		UseKeyfilesCheckBox->Show (enableKeyfiles);
		KeyfilesButton->Show (enableKeyfiles);

		Pkcs5PrfStaticText->Show (enablePkcs5Prf);
		Pkcs5PrfChoice->Show (enablePkcs5Prf);

		if (enablePkcs5Prf)
		{	
			foreach_ref (const Pkcs5Kdf &kdf, Pkcs5Kdf::GetAvailableAlgorithms())
			{
				if (!kdf.IsDeprecated())
					Pkcs5PrfChoice->Append (kdf.GetName());
			}
			Pkcs5PrfChoice->Select (0);
		}

		if (!enablePkcs5Prf || (!enablePassword && !enableKeyfiles))
		{
			GridBagSizer->Remove (Pkcs5PrfSizer);
		}

		// Keyfiles drag & drop
		class FileDropTarget : public wxFileDropTarget
		{
		public:
			FileDropTarget (VolumePasswordPanel *panel) : Panel (panel) { }

			wxDragResult OnDragOver (wxCoord x, wxCoord y, wxDragResult def)
			{
				return wxDragLink;
			}

			bool OnDropFiles (wxCoord x, wxCoord y, const wxArrayString &filenames)
			{
				foreach (const wxString &f, filenames)
					Panel->AddKeyfile (make_shared <Keyfile> (wstring (f)));

				return true;
			}

		protected:
			VolumePasswordPanel *Panel;
		};

		if (enableKeyfiles)
		{
			SetDropTarget (new FileDropTarget (this));
#ifdef TC_MACOSX
			foreach (wxWindow *c, GetChildren())
				c->SetDropTarget (new FileDropTarget (this));
#endif
		}

		Layout();
		Fit();
	}

	VolumePasswordPanel::~VolumePasswordPanel ()
	{
		WipeTextCtrl (PasswordTextCtrl);
		WipeTextCtrl (ConfirmPasswordTextCtrl);
	}

	void VolumePasswordPanel::AddKeyfile (shared_ptr <Keyfile> keyfile)
	{
		if (!Keyfiles)
			Keyfiles.reset (new KeyfileList);

		Keyfiles->push_back (keyfile);
		UseKeyfilesCheckBox->SetValue (true);
	}

	void VolumePasswordPanel::DisplayPassword (bool display, wxTextCtrl **textCtrl, int row)
	{
		FreezeScope freeze (this);

		wxTextCtrl *newTextCtrl = new wxTextCtrl (this, wxID_ANY, wxEmptyString, wxDefaultPosition, wxDefaultSize, display ? 0 : wxTE_PASSWORD);
		newTextCtrl->SetMaxLength (VolumePassword::MaxSize); 
		newTextCtrl->SetValue ((*textCtrl)->GetValue());
		newTextCtrl->SetMinSize ((*textCtrl)->GetSize());

		GridBagSizer->Detach ((*textCtrl));
		GridBagSizer->Add (newTextCtrl, wxGBPosition (row, 1), wxGBSpan (1, 2), wxEXPAND|wxBOTTOM|wxALIGN_CENTER_VERTICAL, 5);
		(*textCtrl)->Show (false);
		WipeTextCtrl (*textCtrl);

		Fit();
		Layout();
		newTextCtrl->SetMinSize ((*textCtrl)->GetMinSize());

		newTextCtrl->Connect (wxEVT_COMMAND_TEXT_UPDATED, wxCommandEventHandler (VolumePasswordPanel::OnTextChanged), nullptr, this);
		*textCtrl = newTextCtrl;
	}

	shared_ptr <VolumePassword> VolumePasswordPanel::GetPassword () const
	{
		return GetPassword (PasswordTextCtrl);
	}

	shared_ptr <VolumePassword> VolumePasswordPanel::GetPassword (wxTextCtrl *textCtrl) const
	{
		shared_ptr <VolumePassword> password;
		wchar_t passwordBuf[VolumePassword::MaxSize + 1];
		finally_do_arg (BufferPtr, BufferPtr (reinterpret_cast <byte *> (passwordBuf), sizeof (passwordBuf)), { finally_arg.Erase(); });

#ifdef TC_WINDOWS
		int len = GetWindowText (static_cast <HWND> (textCtrl->GetHandle()), passwordBuf, VolumePassword::MaxSize + 1);
		password.reset (new VolumePassword (passwordBuf, len));
#else
		wxString passwordStr (textCtrl->GetValue());	// A copy of the password is created here by wxWidgets, which cannot be erased
		for (size_t i = 0; i < passwordStr.size() && i < VolumePassword::MaxSize; ++i)
		{
			passwordBuf[i] = (wchar_t) passwordStr[i];
			passwordStr[i] = L'X';
		}
		password.reset (new VolumePassword (passwordBuf, passwordStr.size() <= VolumePassword::MaxSize ? passwordStr.size() : VolumePassword::MaxSize));
#endif
		return password;
	}

	shared_ptr <Pkcs5Kdf> VolumePasswordPanel::GetPkcs5Kdf () const
	{
		try
		{
			return Pkcs5Kdf::GetAlgorithm (wstring (Pkcs5PrfChoice->GetStringSelection()));
		}
		catch (ParameterIncorrect&)
		{
			return shared_ptr <Pkcs5Kdf> ();
		}
	}

	void VolumePasswordPanel::OnAddKeyfileDirMenuItemSelected (wxCommandEvent& event)
	{
		try
		{
			DirectoryPath dir = Gui->SelectDirectory (this, LangString["SELECT_KEYFILE_PATH"]);

			if (!dir.IsEmpty())
			{
				Keyfiles->push_back (make_shared <Keyfile> (dir));

				UseKeyfilesCheckBox->SetValue (!Keyfiles->empty());
				OnUpdate();
			}
		}
		catch (exception &e)
		{
			Gui->ShowError (e);
		}
	}

	void VolumePasswordPanel::OnAddKeyfilesMenuItemSelected (wxCommandEvent& event)
	{
		try
		{
			FilePathList files = Gui->SelectFiles (this, LangString["SELECT_KEYFILES"], false, true);

			if (!files.empty())
			{
				foreach_ref (const FilePath &f, files)
					Keyfiles->push_back (make_shared <Keyfile> (f));

				UseKeyfilesCheckBox->SetValue (!Keyfiles->empty());
				OnUpdate();
			}
		}
		catch (exception &e)
		{
			Gui->ShowError (e);
		}
	}

	void VolumePasswordPanel::OnAddSecurityTokenSignatureMenuItemSelected (wxCommandEvent& event)
	{
		try
		{
			SecurityTokenKeyfilesDialog dialog (this);
			if (dialog.ShowModal() == wxID_OK)
			{
				foreach (const SecurityTokenKeyfilePath &path, dialog.GetSelectedSecurityTokenKeyfilePaths())
				{
					Keyfiles->push_back (make_shared <Keyfile> (wstring (path)));
				}

				if (!dialog.GetSelectedSecurityTokenKeyfilePaths().empty())
				{
					UseKeyfilesCheckBox->SetValue (!Keyfiles->empty());
					OnUpdate();
				}
			}
		}
		catch (exception &e)
		{
			Gui->ShowError (e);
		}
	}

	void VolumePasswordPanel::OnDisplayPasswordCheckBoxClick (wxCommandEvent& event)
	{
		DisplayPassword (event.IsChecked(), &PasswordTextCtrl, 1);
		
		if (ConfirmPasswordTextCtrl->IsShown())
			DisplayPassword (event.IsChecked(), &ConfirmPasswordTextCtrl, 2);

		OnUpdate();
	}

	void VolumePasswordPanel::OnKeyfilesButtonClick (wxCommandEvent& event)
	{
		KeyfilesDialog dialog (GetParent(), Keyfiles);

		if (dialog.ShowModal() == wxID_OK)
		{
			Keyfiles = dialog.GetKeyfiles();

			UseKeyfilesCheckBox->SetValue (!Keyfiles->empty());
			OnUpdate();
		}
	}

	void VolumePasswordPanel::OnKeyfilesButtonRightClick (wxMouseEvent& event)
	{
		wxMenu popup;
		Gui->AppendToMenu (popup, LangString["IDC_KEYADD"], this, wxCommandEventHandler (VolumePasswordPanel::OnAddKeyfilesMenuItemSelected));
		Gui->AppendToMenu (popup, LangString["IDC_ADD_KEYFILE_PATH"], this, wxCommandEventHandler (VolumePasswordPanel::OnAddKeyfileDirMenuItemSelected));
		Gui->AppendToMenu (popup, LangString["IDC_TOKEN_FILES_ADD"], this, wxCommandEventHandler (VolumePasswordPanel::OnAddSecurityTokenSignatureMenuItemSelected));

		PopupMenu (&popup, KeyfilesButton->GetPosition().x + 2, KeyfilesButton->GetPosition().y + 2);
	}

	void VolumePasswordPanel::OnKeyfilesButtonRightDown (wxMouseEvent& event)
	{
#ifndef TC_MACOSX
		event.Skip();
#endif
	}

	bool VolumePasswordPanel::PasswordsMatch () const
	{
		assert (ConfirmPasswordStaticText->IsShown());
		return *GetPassword (PasswordTextCtrl) == *GetPassword (ConfirmPasswordTextCtrl);
	}

	void VolumePasswordPanel::WipeTextCtrl (wxTextCtrl *textCtrl)
	{
		textCtrl->SetValue (wxString (L'X', textCtrl->GetLineLength(0)));
		GetPassword (textCtrl);
	}
}